Touch Screen Monitor&Display: Why Every Business Should Use It – In an era defined by speed, convenience, and interactivity, businesses are expected to adopt technologies that streamline operations while also improving user engagement. One of the most significant and transformative innovations in recent years is the touch screen monitor and display. No longer reserved for smartphones or tablets, touch technology has expanded into nearly every industry, offering smart, interactive solutions that combine functionality with a user-friendly interface. Whether it’s used in retail for self-checkout, in restaurants for digital ordering, or in offices for collaboration, touch screens are reshaping how businesses interact with both customers and employees.
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A touch screen monitor is a display device that allows users to interact directly with the information on the screen, eliminating the need for external peripherals like a keyboard or mouse. The screen detects touch input, whether from fingers, styluses, or other objects, and translates it into commands. Depending on the technology used, touch screens can respond to pressure, electrical conductivity, or interruptions in light.
There are several different types of touch technologies, each with its unique strengths. Resistive touch screens rely on pressure and are compatible with gloves and styluses, making them suitable for industrial or medical environments. Capacitive touch screens, by contrast, use the electrical properties of the human body and are known for their sensitivity and clarity, though they often require bare skin to operate. Projected capacitive (PCAP) screens are more advanced, supporting multi-touch gestures and offering higher durability, making them ideal for business settings. Meanwhile, optical and infrared technologies work by detecting the presence of an object using sensors or light beams, making them well-suited for large displays or public information terminals.
Understanding these various touch technologies is essential when selecting the right solution for your business needs.
Touch screen displays revolutionize the way customers interact with your business. In retail environments, these interactive screens allow shoppers to browse product catalogs, search for item availability, compare prices, and even place orders—all without needing assistance from staff. This not only improves the efficiency of the shopping experience but also empowers customers by giving them more control.
In the hospitality industry, hotels and restaurants have embraced self-service kiosks that let guests check in, customize their meals, or make reservations. These kiosks significantly reduce wait times, improve order accuracy, and allow businesses to operate more efficiently during peak hours. The combination of convenience, personalization, and speed contributes to higher customer satisfaction and increased brand loyalty.
Touch screen monitors significantly improve operational efficiency by reducing reliance on traditional input devices. In fast-paced environments like fast food chains or cafes, point-of-sale systems equipped with touch screens allow staff to enter orders quickly and accurately, minimizing errors and speeding up the entire transaction process. This leads to faster service, higher throughput, and ultimately more satisfied customers.
For back-office operations, touch screen devices can streamline inventory management, scheduling, and data entry. By integrating with cloud-based software, these systems provide real-time data access and reduce the need for manual input. Touch screens are also commonly used in warehouse operations and logistics, where employees can check inventory, scan items, and receive updates instantly, all from a single interface.
One of the most underrated advantages of touch screen monitors is their ability to save space while enhancing the visual appeal of business environments. Traditional computer setups require multiple components, including a monitor, keyboard, and mouse. Touch screen displays consolidate all of these into a single, sleek unit, freeing up valuable desk or counter space. This is particularly beneficial for small businesses or customer-facing counters where space is at a premium.
Moreover, touch screen monitors lend a modern, high-tech aesthetic to any environment. Their sleek design and responsive interface communicate a sense of innovation and professionalism. Whether mounted on a wall, embedded in a kiosk, or placed on a counter, touch screens create a clean and clutter-free workspace that leaves a lasting impression on customers and clients.
The adaptability of touch screen monitors is one of the reasons they are being adopted across so many different industries. In retail, they are used for interactive product displays, digital signage, and self-checkout systems, allowing customers to complete their shopping experience without needing to wait in line. They also serve as price checkers and promotional platforms that display real-time updates on sales and offers.
In healthcare settings, touch screen displays are used for patient check-ins, medical imaging, and accessing electronic medical records. These systems help reduce paperwork, minimize human error, and speed up administrative tasks, all while protecting sensitive patient information through secure access controls.
Education institutions benefit from touch-enabled whiteboards and interactive displays that facilitate collaborative learning. Teachers and students can engage with content dynamically, making lessons more interactive and engaging.
In the corporate world, touch screens enhance productivity through interactive meeting room displays and digital whiteboards that support brainstorming and collaboration. They can also be integrated into visitor management systems, allowing for seamless check-in and appointment scheduling.
Manufacturing and industrial sectors use rugged touch screen monitors that withstand harsh conditions such as dust, vibration, and extreme temperatures. These displays are often used for real-time monitoring, equipment control, and quality assurance processes, improving accuracy and efficiency on the production floor.
Touch screen monitors allow for quicker and more intuitive user interaction. Unlike traditional input methods that require multiple devices, touch screens streamline the process by enabling users to tap, swipe, and drag directly on the display. This not only reduces the learning curve but also increases user confidence and productivity. New employees can become proficient with minimal training, and customers can navigate interfaces effortlessly.
Durability is another major advantage of business-grade touch screens. These devices are designed to withstand constant use and can handle accidental spills, dust, and even physical impact. Especially in public or industrial environments, the longevity of touch screens reduces maintenance costs and minimizes downtime.
Scalability is an important consideration for growing businesses. Touch screen monitors are available in various sizes and formats, from small tabletop displays to large wall-mounted units. They can also be tailored with custom software to meet the specific needs of different workflows, making them suitable for both startups and large enterprises. The ability to scale and customize ensures that businesses can adopt the technology at a pace that suits their budget and goals.
Selecting the right touch screen monitor involves evaluating several key factors to ensure compatibility with your business needs. First, consider the environment in which the screen will be used. Indoor displays may focus on brightness and resolution, while outdoor displays must be weatherproof and readable under direct sunlight.
Size is another critical aspect. A compact 10-inch display may be suitable for a tabletop kiosk, while a larger 43-inch screen might be necessary for digital signage or interactive presentations. Mounting options also vary; wall-mounted units save space, embedded screens create a seamless look, and freestanding kiosks offer mobility and versatility.
The choice of touch technology is essential. For high-traffic or precision applications, projected capacitive (PCAP) screens offer excellent responsiveness and durability. In contrast, users prefer resistive screens in environments where they regularly use gloves or styluses. Software compatibility is also vital. Whether your system runs on Windows, Android, or Linux, the touch screen monitor must integrate smoothly without additional drivers or complex setup.
Integrating touch screen monitor&display into an existing business setup is often easier than many assume. Most manufacturers design modern touch displays to be plug-and-play, so users can connect them to computers via standard USB and HDMI ports and start using them immediately. This simplifies the transition and reduces the need for IT support during installation.
For more advanced use cases, many touch screen manufacturers provide software development kits (SDKs) and APIs that allow businesses to create custom applications tailored to their operations. These integrations can connect to cloud platforms, customer relationship management (CRM) software, point-of-sale systems, or enterprise resource planning (ERP) tools. In office environments, touch displays often sync with video conferencing tools. It is allowing for seamless communication and collaboration across teams and locations.
As remote and hybrid work models continue to gain traction, touch screen monitors have become indispensable tools for modern collaboration. Interactive displays allow teams to engage in virtual meetings as if they were physically present. Features such as digital whiteboarding enable users to annotate documents, draw diagrams, and brainstorm ideas in real-time, regardless of geographic location.
For remote support and diagnostics, touch screen devices provide intuitive interfaces that simplify troubleshooting and maintenance. Whether used by IT staff or end users, these systems reduce the need for on-site visits and ensure faster issue resolution. Touch-enabled displays also enhance digital presentations, allowing users to control slideshows and multimedia content with simple gestures. It is making virtual meetings more dynamic and engaging.
Although touch screen monitors can have a higher upfront cost compared to traditional displays. The long-term return on investment (ROI) makes them a financially sound choice. Businesses benefit from labor savings through self-service options, increased efficiency in operations, and reduced reliance on printed materials.
Customer satisfaction improves as interactions become faster, easier, and more engaging. Staff productivity also increases, as touch screens simplify tasks and reduce the potential for human error. Maintenance and repair costs are typically lower thanks to the robust design of commercial-grade units, and energy-efficient models help reduce utility expenses. Many touch screen monitors come with long warranties, further enhancing their value as a long-term investment.
Touch screen monitors are proving invaluable across a wide range of industries. In retail, they enhance the shopping experience by offering product information, enabling self-checkout, and displaying promotions. Restaurants use them for ordering and payment kiosks that streamline service and reduce wait times. Hospitals use touch-enabled systems for patient check-in, record access, and diagnostic displays that improve healthcare efficiency and accuracy.
At airports, passengers benefit from touch screens during flight check-ins and when navigating terminal information panels. Banks have adopted touch screens for ATMs and customer service kiosks that offer faster, more private assistance. Offices are embracing the technology for interactive meetings, digital whiteboards, and visitor check-in systems. All of which contribute to a smarter and more efficient workspace.
The future of touch screen technology promises even more exciting possibilities. Emerging features such as haptic feedback will simulate the sensation of real touch. It is adding a new layer of realism to user interactions. Transparent touch screens are also in development, enabling futuristic display solutions for retail storefronts and automotive dashboards.
Artificial intelligence integration will allow touch screens to offer personalized experiences, predictive suggestions, and enhanced data analytics. It is empowering businesses to make smarter decisions. Experts expect gesture-based interactions to grow, allowing users to control displays without physical contact. It serves as a valuable feature in environments focused on hygiene and safety.
Adopting these next-generation technologies early will give businesses a competitive edge and position them as leaders in innovation.
Touch screen monitor&display has evolved from cutting-edge novelties to practical tools that offer measurable benefits across industries. By improving customer engagement, streamlining operations, and adding a modern aesthetic to business environments, they provide a powerful combination of function and form.
If you want your business to thrive in today’s digital-first world, now is the perfect time to adopt interactive technology. Whether you’re operating a small shop or managing a global enterprise, touch screen monitors are scalable, customizable, and built to support your growth. Don’t wait for the future—bring it to your business today with the power of touch.
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A touchscreen (or touch screen) is a type of display that can detect touch input from a user. It consists of both an input device (a touch panel) and an output device (a visual display). The touch panel is typically layered on the top of the electronic visual display of a device. Touchscreens are commonly found in smartphones, tablets, laptops, and other electronic devices. The display is often an LCD, AMOLED or OLED display.
A user can give input or control the information processing system through simple or multi-touch gestures by touching the screen with a special stylus or one or more fingers.[1] Some touchscreens use ordinary or specially coated gloves to work, while others may only work using a special stylus or pen. The user can use the touchscreen to react to what is displayed and, if the software allows, to control how it is displayed; for example, zooming to increase the text size.
A touchscreen enables the user to interact directly with what is displayed, instead of using a mouse, touchpad, or other such devices (other than a stylus, which is optional for most modern touchscreens).[2]
Touchscreens are common in devices such as smartphones, handheld game consoles, and personal computers. They are common in point-of-sale (POS) systems, automated teller machines (ATMs), electronic voting machines, and automobile infotainment systems and controls. They can also be attached to computers or, as terminals, to networks. They play a prominent role in the design of digital appliances such as personal digital assistants (PDAs) and some e-readers. Touchscreens are important in educational settings such as classrooms or on college campuses.[3]
The popularity of smartphones, tablets, and many types of information appliances has driven the demand and acceptance of common touchscreens for portable and functional electronics. Touchscreens are found in the medical field, heavy industry, automated teller machines (ATMs), and kiosks such as museum displays or room automation, where keyboard and mouse systems do not allow a suitably intuitive, rapid, or accurate interaction by the user with the display's content.
Historically, the touchscreen sensor and its accompanying controller-based firmware have been made available by a wide array of after-market system integrators, and not by display, chip, or motherboard manufacturers. Display manufacturers and chip manufacturers have acknowledged the trend toward acceptance of touchscreens as a user interface component and have begun to integrate touchscreens into the fundamental design of their products.
One predecessor of the modern touchscreen includes stylus based systems.
DIRECT LIGHT PEN - A patent was filed by Philco Company for a stylus designed for sports telecasting which, when placed against an intermediate cathode-ray tube (CRT) display would amplify and add to the original signal. Effectively, this was used for temporarily drawing arrows or circles onto a live television broadcast, as described in US A, Denk, William E, "Electronic pointer for television images", issued -11-08 .
OPTICAL - The first version of a touchscreen which operated independently of the light produced from the screen was patented by AT&T Corporation US A, Harmon, Leon D, "Electrographic transmitter", issued -01-09 . This touchscreen utilized a matrix of collimated lights shining orthogonally across the touch surface. When a beam is interrupted by a stylus, the photodetectors which no longer are receiving a signal can be used to determine where the interruption is. Later iterations of matrix based touchscreens built upon this by adding more emitters and detectors to improve resolution, pulsing emitters to improve optical signal to noise ratio, and a nonorthogonal matrix to remove shadow readings when using multi-touch.
INDIRECT LIGHT PEN - Later inventions built upon this system to free telewriting styli from their mechanical bindings. By transcribing what a user draws onto a computer, it could be saved for future use. See US A, Graham, Robert E, "Telewriting apparatus", issued -05-14 .
CAPACITANCE AND RESISTANCE - The first finger driven touchscreen was developed by Eric Johnson, of the Royal Radar Establishment located in Malvern, England, who described his work on capacitive touchscreens in a short article published in [8][9] and then more fully—with photographs and diagrams—in an article published in .[10]
MID-60s ULTRASONIC CURTAIN - Another precursor of touchscreens, an ultrasonic-curtain-based pointing device in front of a terminal display, had been developed by a team around Rainer Mallebrein [de] at Telefunken Konstanz for an air traffic control system.[11] In , this evolved into a device named "Touchinput-Einrichtung" ("touch input facility") for the SIG 50 terminal utilizing a conductively coated glass screen in front of the display.[12][11] This was patented in and the patent was granted a couple of years later.[12][11] The same team had already invented and marketed the Rollkugel mouse RKS 100-86 for the SIG 100-86 a couple of years earlier.[12]
CAPACITANCE - The application of touch technology for air traffic control was described in an article published in .[13] Frank Beck and Bent Stumpe, engineers from CERN (European Organization for Nuclear Research), developed a transparent touchscreen in the early s,[14] based on Stumpe's work at a television factory in the early s. Then manufactured by CERN, and shortly after by industry partners,[15] it was put to use in .[16]
OPTICAL - A group at the University of Illinois filed for a patent on an optical touchscreen[17] that became a standard part of the Magnavox Plato IV Student Terminal and thousands were built for this purpose. These touchscreens had a crossed array of 16×16 infrared position sensors, each composed of an LED on one edge of the screen and a matched phototransistor on the other edge, all mounted in front of a monochrome plasma display panel. This arrangement could sense any fingertip-sized opaque object in close proximity to the screen.
MULTI-TOUCH CAPACITANCE - In , Beck and Stumpe published another article describing their capacitive touchscreen. This indicated that it was capable of multi-touch but this feature was purposely inhibited, presumably as this was not considered useful at the time ("A...variable...called BUT changes value from zero to five when a button is touched. The touching of other buttons would give other non-zero values of BUT but this is protected against by software" (Page 6, section 2.6).[18] "Actual contact between a finger and the capacitor is prevented by a thin sheet of plastic" (Page 3, section 2.3).
RESISTIVE - An American company, Elographics – in partnership with Siemens – began work on developing a transparent implementation of an existing opaque touchpad technology, U.S. patent No. 3,911,215, October 7, , which had been developed by Elographics' founder George Samuel Hurst.[19] The resulting resistive technology touch screen was first shown on the World's Fair at Knoxville in .[20]
MULTI-TOUCH CAMERA - Multi-touch technology began in , when the University of Toronto's Input Research Group developed the first human-input multi-touch system, using a frosted-glass panel with a camera placed behind the glass.
OPTICAL - An optical touchscreen was used on the HP-150 starting in . The HP 150 was one of the world's earliest commercial touchscreen computers.[21] HP mounted their infrared transmitters and receivers around the bezel of a 9-inch Sony cathode ray tube (CRT).
MULTI-TOUCH FORCE SENSING TOUCHSCREEN - Bob Boie of AT&T Bell Labs, used capacitance to track the mechanical changes in thickness of a soft, deformable overlay membrane when one or more physical objects interact with it;[22] the flexible surface being easily replaced, if damaged by these objects. The patent states "the tactile sensor arrangements may be utilized as a touch screen".
Many derivative sources[23][24][25] retrospectively describe Boie as making a major advancement with his touchscreen technology; but no evidence has been found that a rugged multi-touch capacitive touchscreen, that could sense through a rigid, protective overlay - the sort later required for a mobile , was ever developed or patented by Boie.[26] Many of these citations rely on anecdotal evidence from Bill Buxton of Bell Labs.[27] However, Bill Buxton did not have much luck getting his hands on this technology. As he states in the citation: "Our assumption (false, as it turned out) was that the Boie technology would become available to us in the near future. Around I took a group from Xerox to see this technology it [sic] since I felt that it would be appropriate for the user interface of our large document processors. This did not work out".
UP TO CAPACITANCE - Although, as cited earlier, Johnson is credited with developing the first finger operated capacitive and resistive touchscreens in , these worked by directly touching wires across the front of the screen.[9] Stumpe and Beck developed a self-capacitance touchscreen in , and a mutual capacitance touchscreen in . Both these devices could only sense the finger by direct touch or through a thin insulating film.[28] This was 11 microns thick according to Stumpe's report.[29]
TOUCHPAD - Fujitsu released a touch pad for the Micro 16 to accommodate the complexity of kanji characters, which were stored as tiled graphics.[30]
GRAPHIC TABLET - A graphic touch tablet was released for the Sega AI Computer.[31][32]
EARLY 80s EVALUATION FOR AIRCRAFT - Touch-sensitive control-display units (CDUs) were evaluated for commercial aircraft flight decks in the early s. Initial research showed that a touch interface would reduce pilot workload as the crew could then select waypoints, functions and actions, rather than be "head down" typing latitudes, longitudes, and waypoint codes on a keyboard. An effective integration of this technology was aimed at helping flight crews maintain a high level of situational awareness of all major aspects of the vehicle operations including the flight path, the functioning of various aircraft systems, and moment-to-moment human interactions.[33]
EARLY 80s EVALUATION FOR CARS - also, in the early s, General Motors tasked its Delco Electronics division with a project aimed at replacing an automobile's non-essential functions (i.e. other than throttle, transmission, braking, and steering) from mechanical or electro-mechanical systems with solid state alternatives wherever possible. The finished device was dubbed the ECC for "Electronic Control Center", a digital computer and software control system hardwired to various peripheral sensors, servomechanisms, solenoids, antenna and a monochrome CRT touchscreen that functioned both as display and sole method of input.[34] The ECC replaced the traditional mechanical stereo, fan, heater and air conditioner controls and displays, and was capable of providing very detailed and specific information about the vehicle's cumulative and current operating status in real time. The ECC was standard equipment on the – Buick Riviera and later the – Buick Reatta, but was unpopular with consumers—partly due to the technophobia of some traditional Buick customers, but mostly because of costly technical problems suffered by the ECC's touchscreen which would render climate control or stereo operation impossible.[35]
GRAPHIC TABLET - Sega released the Terebi Oekaki, also known as the Sega Graphic Board, for the SG- video game console and SC- home computer. It consisted of a plastic pen and a plastic board with a transparent window where pen presses are detected. It was used primarily with a drawing software application.[36]
MULTI-TOUCH CAPACITANCE - The University of Toronto group, including Bill Buxton, developed a multi-touch tablet that used capacitance rather than bulky camera-based optical sensing systems (see History of multi-touch).
USED FOR POINT OF SALE - The first commercially available graphical point-of-sale (POS) software was demonstrated on the 16-bit Atari 520ST color computer. It featured a color touchscreen widget-driven interface.[37] The ViewTouch[38] POS software was first shown by its developer, Gene Mosher, at the Atari Computer demonstration area of the Fall COMDEX expo in .[39]
CAPACITANCE TOUCH KEYS - Casio launched the Casio PB- pocket computer with a touchscreen consisting of a 4×4 matrix, resulting in 16 touch areas in its small LCD graphic screen.
SELECT ON "LIFT-OFF" - Touchscreens had a bad reputation of being imprecise until . Most user-interface books would state that touchscreen selections were limited to targets larger than the average finger. At the time, selections were done in such a way that a target was selected as soon as the finger came over it, and the corresponding action was performed immediately. Errors were common, due to parallax or calibration problems, leading to user frustration. "Lift-off strategy"[40] was introduced by researchers at the University of Maryland Human–Computer Interaction Lab (HCIL). As users touch the screen, feedback is provided as to what will be selected: users can adjust the position of the finger, and the action takes place only when the finger is lifted off the screen. This allowed the selection of small targets, down to a single pixel on a 640×480 Video Graphics Array (VGA) screen (a standard of that time).
WORLD EXPO - From April to October , the city of Brisbane, Australia hosted Expo 88, whose theme was "leisure in the age of technology". To support the event and provide information to expo visitors, Telecom Australia (now Telstra) erected 8 kiosks around the expo site with a total of 56 touch screen information consoles, being specially modified Sony Videotex Workstations. Each system was also equipped with a videodisc player, speakers, and a 20 MB hard drive. In order to keep up-to-date information during the event, the database of visitor information was updated and remotely transferred to the computer terminals each night. Using the touch screens, visitors were able to find information about the exposition’s rides, attractions, performances, facilities, and the surrounding areas. Visitors could also select between information displayed in English and Japanese; a reflection of Australia’s overseas tourist market in the s. It is worth noting that Telecom’s Expo Info system was based on an earlier system employed at Expo 86 in Vancouver, Canada.[41]
SINGLE AND MULTI-TOUCH GESTURES - Sears et al. ()[42] gave a review of academic research on single and multi-touch human–computer interaction of the time, describing gestures such as rotating knobs, adjusting sliders, and swiping the screen to activate a switch (or a U-shaped gesture for a toggle switch). The HCIL team developed and studied small touchscreen keyboards (including a study that showed users could type at 25 wpm on a touchscreen keyboard), aiding their introduction on mobile devices. They also designed and implemented multi-touch gestures such as selecting a range of a line, connecting objects, and a "tap-click" gesture to select while maintaining location with another finger.
TOUCHSCREEN SLIDER AND TOGGLE SWITCHES - HCIL demonstrated a touchscreen slider,[43] which was later cited as prior art in the lock screen patent litigation between Apple and other touchscreen mobile vendors (in relation to U.S. patent 7,657,849).[44]
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INERTIAL CONTROL - From to , the Sun Star7 prototype PDA implemented a touchscreen with inertial scrolling.[45]
CAPACITANCE MOUSE / KEYPAD - Bob Boie of AT&T Bell Labs, patented a simple mouse or keypad that capacitively sensed just one finger through a thin insulator.[46] Although not claimed or even mentioned in the patent, this technology could potentially have been used as a capacitance touchscreen.
FIRST RESISTIVE TOUCHSCREEN - IBM released the IBM Simon, which is the first touchscreen .
EARLY 90s ABANDONED GAME CONTROLLER - An early attempt at a handheld game console with touchscreen controls was Sega's intended successor to the Game Gear, though the device was ultimately shelved and never released due to the expensive cost of touchscreen technology in the early s.
MOBILE MULTI-TOUCH CAPACITANCE PATENT - Apple patents its multi-touch capacitive touchscreen for mobile devices.
VIDEO GAMES WITH TOUCHSCREENS - Touchscreens were not popularly used for video games until the release of the Nintendo DS in .[47]
MOBILE WITH CAPACITANCE - The first mobile with a capacitive touchscreen was LG Prada, released in May (which was before the first iPhone released).[48] By , touchscreen-enabled mobile phones were becoming trendy and quickly gaining popularity in both basic and advanced devices.[49][50] In Quarter-4 for the first time, a majority of smartphones (i.e. not all mobile phones) shipped with touchscreens over non-touch.[51]
FORCE SENSING TOUCHSCREENS - Until recently,[when?] most consumer touchscreens could only sense one point of contact at a time, and few have had the capability to sense how hard one is touching. This has changed with the commercialization of multi-touch technology, and the Apple Watch being released with a force-sensitive display in April .
There are a number of touchscreen technologies, with different methods of sensing touch.[42]
A resistive touchscreen panel is composed of several thin layers, the most important of which are two transparent electrically resistive layers facing each other with a thin gap between them. The top layer (the layer that is touched) has a coating on the underside surface; just beneath it is a similar resistive layer on top of its substrate. One layer has conductive connections along its sides, while the other along the top and bottom. A voltage is applied to one layer and sensed by the other. When an object, such as a fingertip or stylus tip, presses down onto the outer surface, the two layers touch to become connected at that point.[52] The panel then behaves as a pair of voltage dividers, one axis at a time. By rapidly switching between each layer, the position of pressure on the screen can be detected.
Resistive touch is used in restaurants, factories, and hospitals due to its high tolerance for liquids and contaminants. A major benefit of resistive-touch technology is its low cost. Additionally, they may be used with gloves on, or by using anything rigid as a finger substitute, as only sufficient pressure is necessary for the touch to be sensed. Disadvantages include the need to press down, and a risk of damage by sharp objects. Resistive touchscreens also suffer from poorer contrast, due to having additional reflections (i.e. glare) from the layers of material placed over the screen.[53] This type of touchscreen has been used by Nintendo in the DS family, the 3DS family, and the Wii U GamePad.[54]
Due to their simple structure, with very few inputs, resistive touchscreens are mainly used for single touch operation, although some two touch versions (often described as multi-touch) are available.[55][56] However, there are some true multi-touch resistive touchscreens available. These need many more inputs, and rely on x/y multiplexing to keep the I/O count down.
One example of a true multi-touch resistive touchscreen[57] can detect 10 fingers at the same time. This has 80 I/O connections. These are possibly split 34 x inputs / 46 y outputs, forming a standard 3:4 aspect ratio touchscreen with x/y intersecting touch sensing nodes.
Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touchscreen panel. When the panel is touched, a portion of the wave is absorbed. The change in ultrasonic waves is processed by the controller to determine the position of the touch event. Surface acoustic wave touchscreen panels can be damaged by outside elements. Contaminants on the surface can also interfere with the functionality of the touchscreen.
SAW devices have a wide range of applications, including delay lines, filters, correlators and DC to DC converters.
A capacitive touchscreen panel consists of an insulator, such as glass, coated with a transparent conductor, such as indium tin oxide (ITO).[58] As the human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance. Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing. Some touchscreens use silver instead of ITO, as ITO causes several environmental problems due to the use of indium.[59][60][61][62] The controller is typically a complementary metal–oxide–semiconductor (CMOS) application-specific integrated circuit (ASIC) chip, which in turn usually sends the signals to a CMOS digital signal processor (DSP) for processing.[63][64]
Unlike a resistive touchscreen, some capacitive touchscreens cannot be used to detect a finger through electrically insulating material, such as gloves. This disadvantage especially affects usability in consumer electronics, such as touch tablet PCs and capacitive smartphones in cold weather when people may be wearing gloves. It can be overcome with a special capacitive stylus, or a special-application glove with an embroidered patch of conductive thread allowing electrical contact with the user's fingertip.
A low-quality switching-mode power supply unit with an accordingly unstable, noisy voltage may temporarily interfere with the precision, accuracy and sensitivity of capacitive touch screens.[65][66][67]
Some capacitive display manufacturers continue to develop thinner and more accurate touchscreens. Those for mobile devices are now being produced with 'in-cell' technology, such as in Samsung's Super AMOLED screens, that eliminates a layer by building the capacitors inside the display itself. This type of touchscreen reduces the visible distance between the user's finger and what the user is touching on the screen, reducing the thickness and weight of the display, which is desirable in smartphones.
A simple parallel-plate capacitor has two conductors separated by a dielectric layer. Most of the energy in this system is concentrated directly between the plates. Some of the energy spills over into the area outside the plates, and the electric field lines associated with this effect are called fringing fields. Part of the challenge of making a practical capacitive sensor is to design a set of printed circuit traces which direct fringing fields into an active sensing area accessible to a user. A parallel-plate capacitor is not a good choice for such a sensor pattern. Placing a finger near fringing electric fields adds conductive surface area to the capacitive system. The additional charge storage capacity added by the finger is known as finger capacitance, or CF. The capacitance of the sensor without a finger present is known as parasitic capacitance, or CP.
In this basic technology, only one side of the insulator is coated with a conductive layer. A small voltage is applied to the layer, resulting in a uniform electrostatic field. When a conductor, such as a human finger, touches the uncoated surface, a capacitor is dynamically formed. The sensor's controller can determine the location of the touch indirectly from the change in the capacitance as measured from the four corners of the panel. As it has no moving parts, it is moderately durable but has limited resolution, is prone to false signals from parasitic capacitive coupling, and needs calibration during manufacture. It is therefore most often used in simple applications such as industrial controls and kiosks.[68]
Although some standard capacitance detection methods are projective, in the sense that they can be used to detect a finger through a non-conductive surface, they are very sensitive to fluctuations in temperature, which expand or contract the sensing plates, causing fluctuations in the capacitance of these plates.[69] These fluctuations result in a lot of background noise, so a strong finger signal is required for accurate detection. This limits applications to those where the finger directly touches the sensing element or is sensed through a relatively thin non-conductive surface.
An electrical signal, imposed on one electrical conductor, can be capacitively "sensed" by another electrical conductor that is in very close proximity, but electrically isolated—a feature that is exploited in mutual capacitance touchscreens. In a mutual capacitive sensor array, the "mutual" crossing of one electrical conductor with another electrical conductor, but with no direct electrical contact, forms a capacitor (see touchscreen#Construction).
High frequency voltage pulses are applied to these conductors, one at a time. These pulses capacitively couple to every conductor that intersects it.
Bringing a finger or conductive stylus close to the surface of the sensor changes the local electrostatic field, which in turn reduces the capacitance between these intersecting conductors. Any significant change in the strength of the signal sensed is used to determine if a finger is present or not at an intersection.[70]
The capacitance change at every intersection on the grid can be measured to accurately determine one or more touch locations.
Mutual capacitance allows multi-touch operation where multiple fingers, palms or styli can be accurately tracked at the same time.The greater the number of intersections, the better the touch resolution and the more independent fingers that can be detected.[71] [72] This indicates a distinct advantage of diagonal wiring over standard x/y wiring, since diagonal wiring creates nearly twice the number of intersections.
A 30 i/o, 16×14 x/y array, for example, would have 224 of these intersections / capacitors, and a 30 i/o diagonal lattice array could have 435 intersections.
Each trace of an x/y mutual capacitance array only has one function, it is either an input or an output. The horizontal traces may be transmitters while the vertical traces are sensors, or vice versa.
Self-capacitance sensors can have the same layout as mutual capacitance sensors, but, with self-capacitance all the traces usually operate independently, with no interaction between different traces. Along with several other methods, the extra capacitive load of a finger on a trace electrode may be measured by a current meter, or by the change in frequency of an RC oscillator.
Traces are sensed, one after the other until all the traces have been sensed. A finger may be detected anywhere along the whole length of a trace (even "off-screen"), but there is no indication where the finger is along that trace. If, however, a finger is also detected along another intersecting trace, then it is assumed that the finger position is at the intersection of the two traces. This allows for the speedy and accurate detection of a single finger.
Although mutual capacitance is simpler for multi-touch, multi-touch can be achieved using self-capacitance.
Self-capacitive touch screen layers are used on mobile phones such as the Sony Xperia Sola,[73] the Samsung Galaxy S4, Galaxy Note 3, Galaxy S5, and Galaxy Alpha.
Self-capacitance is far more sensitive than mutual capacitance and is mainly used for single touch, simple gesturing and proximity sensing where the finger does not even have to touch the glass surface. Mutual capacitance is mainly used for multitouch applications.[74] Many touchscreen manufacturers use both self and mutual capacitance technologies in the same product, thereby combining their individual benefits.[75]
Capacitive touchscreens do not necessarily need to be operated by a finger, but until recently the special styli required could be quite expensive to purchase. The cost of this technology has fallen greatly in recent years and capacitive styli are now widely available for a nominal charge, and often given away free with mobile accessories. These consist of an electrically conductive shaft with a soft conductive rubber tip, thereby resistively connecting the fingers to the tip of the stylus.
An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch. A major benefit of such a system is that it can detect essentially any opaque object including a finger, gloved finger, stylus or pen. It is generally used in outdoor applications and POS systems that cannot rely on a conductor (such as a bare finger) to activate the touchscreen. Unlike capacitive touchscreens, infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system. Infrared touchscreens are sensitive to dirt and dust that can interfere with the infrared beams, and suffer from parallax in curved surfaces and accidental press when the user hovers a finger over the screen while searching for the item to be selected.
A translucent acrylic sheet is used as a rear-projection screen to display information. The edges of the acrylic sheet are illuminated by infrared LEDs, and infrared cameras are focused on the back of the sheet. Objects placed on the sheet are detectable by the cameras. When the sheet is touched by the user, frustrated total internal reflection results in leakage of infrared light which peaks at the points of maximum pressure, indicating the user's touch location. Microsoft's PixelSense tablets used this technology.[76]
Optical touchscreens are a relatively modern development in touchscreen technology, in which two or more image sensors (such as CMOS sensors) are placed around the edges (mostly the corners) of the screen. Infrared backlights are placed in the sensor's field of view on the opposite side of the screen. A touch blocks some lights from the sensors, and the location and size of the touching object can be calculated (see visual hull). This technology is growing in popularity due to its scalability, versatility, and affordability for larger touchscreens.
Introduced in by 3M, this system detects a touch by using sensors to measure the piezoelectricity in the glass. Complex algorithms interpret this information and provide the actual location of the touch.[77] The technology is unaffected by dust and other outside elements, including scratches. Since there is no need for additional elements on screen, it also claims to provide excellent optical clarity. Any object can be used to generate touch events, including gloved fingers. A downside is that after the initial touch, the system cannot detect a motionless finger. However, for the same reason, resting objects do not disrupt touch recognition.
The key to this technology is that a touch at any one position on the surface generates a sound wave in the substrate which then produces a unique combined signal as measured by three or more tiny transducers attached to the edges of the touchscreen. The digitized signal is compared to a list corresponding to every position on the surface, determining the touch location. A moving touch is tracked by rapid repetition of this process. Extraneous and ambient sounds are ignored since they do not match any stored sound profile. The technology differs from other sound-based technologies by using a simple look-up method rather than expensive signal-processing hardware. As with the dispersive signal technology system, a motionless finger cannot be detected after the initial touch. However, for the same reason, the touch recognition is not disrupted by any resting objects. The technology was created by SoundTouch Ltd in the early s, as described by the patent family EP, and introduced to the market by Tyco International's Elo division in as Acoustic Pulse Recognition.[78] The touchscreen used by Elo is made of ordinary glass, giving good durability and optical clarity. The technology usually retains accuracy with scratches and dust on the screen. The technology is also well suited to displays that are physically larger.
There are several principal ways to build a touchscreen. The key goals are to recognize one or more fingers touching a display, to interpret the command that this represents, and to communicate the command to the appropriate application.
Multi-touch capacitance screens
A very simple, low cost way to make a multi-touch capacitance touchscreen, is to sandwich an x/y or diagonal matrix of fine, insulation coated copper or tungsten wires between two layers of clear polyester film. This creates an array of proximity sensing micro-capacitors. One of these micro-capacitors every 10 to 15 mm is probably sufficient spacing if fingers are relatively widely spaced apart, but very high discrimination multi-touch may need a micro-capacitor every 5 or 6 mm. A similar system can be used for ultra-high resolution sensing, such as fingerprint sensing. Fingerprint sensors require a micro-capacitor spacing of about 44 to 50 microns.[79]
Single touch resistive touchscreens
In the resistive approach, which used to be the most popular technique, there are typically four layers:
When a user touches the surface, the system records the change in the electric current that flows through the display.
Dispersive signal
Dispersive signal technology measures the piezoelectric effect—the voltage generated when mechanical force is applied to a material that occurs chemically when a strengthened glass substrate is touched.
Infrared
There are two infrared-based approaches. In one, an array of sensors detects a finger touching or almost touching the display, thereby interrupting infrared light beams projected over the screen. In the other, bottom-mounted infrared cameras record heat from screen touches.
In each case, the system determines the intended command based on the controls showing on the screen at the time and the location of the touch.
The development of multi-touch screens facilitated the tracking of more than one finger on the screen; thus, operations that require more than one finger are possible. These devices also allow multiple users to interact with the touchscreen simultaneously.
With the growing use of touchscreens, the cost of touchscreen technology is routinely absorbed into the products that incorporate it and is nearly eliminated. Touchscreen technology has demonstrated reliability and is found in airplanes, automobiles, gaming consoles, machine control systems, appliances, and handheld display devices including cellphones; the touchscreen market for mobile devices was projected to produce US$5 billion by .[80][needs update]
The ability to accurately point on the screen itself is also advancing with the emerging graphics tablet-screen hybrids. Polyvinylidene fluoride (PVDF) plays a major role in this innovation due its high piezoelectric properties, which allow the tablet to sense pressure, making such things as digital painting behave more like paper and pencil.[81]
TapSense, announced in October , allows touchscreens to distinguish what part of the hand was used for input, such as the fingertip, knuckle and fingernail. This could be used in a variety of ways, for example, to copy and paste, to capitalize letters, to activate different drawing modes, etc.[82][83]
For touchscreens to be effective input devices, users must be able to accurately select targets and avoid accidental selection of adjacent targets. The design of touchscreen interfaces should reflect technical capabilities of the system, ergonomics, cognitive psychology and human physiology.
Guidelines for touchscreen designs were first developed in the s, based on early research and actual use of older systems, typically using infrared grids—which were highly dependent on the size of the user's fingers. These guidelines are less relevant for the bulk of modern touch devices which use capacitive or resistive touch technology.[84][85]
From the mid-s, makers of operating systems for smartphones have promulgated standards, but these vary between manufacturers, and allow for significant variation in size based on technology changes, so are unsuitable from a human factors perspective.[86][87][88]
Much more important is the accuracy humans have in selecting targets with their finger or a pen stylus. The accuracy of user selection varies by position on the screen: users are most accurate at the center, less so at the left and right edges, and least accurate at the top edge and especially the bottom edge. The R95 accuracy (required radius for 95% target accuracy) varies from 7 mm (0.28 in) in the center to 12 mm (0.47 in) in the lower corners.[89][90][91][92][93] Users are subconsciously aware of this, and take more time to select targets which are smaller or at the edges or corners of the touchscreen.[94]
This user inaccuracy is a result of parallax, visual acuity and the speed of the feedback loop between the eyes and fingers. The precision of the human finger alone is much, much higher than this, so when assistive technologies are provided—such as on-screen magnifiers—users can move their finger (once in contact with the screen) with precision as small as 0.1 mm (0.004 in).[95][dubious – discuss]
Users of handheld and portable touchscreen devices hold them in a variety of ways, and routinely change their method of holding and selection to suit the position and type of input. There are four basic types of handheld interaction:
Use rates vary widely. While two-thumb tapping is encountered rarely (1–3%) for many general interactions, it is used for 41% of typing interaction.[96]
In addition, devices are often placed on surfaces (desks or tables) and tablets especially are used in stands. The user may point, select or gesture in these cases with their finger or thumb, and vary use of these methods.[97]
Touchscreens are often used with haptic response systems. A common example of this technology is the vibratory feedback provided when a button on the touchscreen is tapped. Haptics are used to improve the user's experience with touchscreens by providing simulated tactile feedback, and can be designed to react immediately, partly countering on-screen response latency. Research from the University of Glasgow (Brewster, Chohan, and Brown, ; and more recently Hogan) demonstrates that touchscreen users reduce input errors (by 20%), increase input speed (by 20%), and lower their cognitive load (by 40%) when touchscreens are combined with haptics or tactile feedback. On top of this, a study conducted in by Boston College explored the effects that touchscreens haptic stimulation had on triggering psychological ownership of a product. Their research concluded that a touchscreens ability to incorporate high amounts of haptic involvement resulted in customers feeling more endowment to the products they were designing or buying. The study also reported that consumers using a touchscreen were willing to accept a higher price point for the items they were purchasing.[98]
Touchscreen technology has become integrated into many aspects of customer service industry in the 21st century.[99] The restaurant industry is a good example of touchscreen implementation into this domain. Chain restaurants such as Taco Bell,[100] Panera Bread, and McDonald's offer touchscreens as an option when customers are ordering items off the menu.[101] While the addition of touchscreens is a development for this industry, customers may choose to bypass the touchscreen and order from a traditional cashier.[100] To take this a step further, a restaurant in Bangalore has attempted to completely automate the ordering process. Customers sit down to a table embedded with touchscreens and order off an extensive menu. Once the order is placed it is sent electronically to the kitchen.[102] These types of touchscreens fit under the Point of Sale (POS) systems mentioned in the lead section.
Extended use of gestural interfaces without the ability of the user to rest their arm is referred to as "gorilla arm".[103] It can result in fatigue, and even repetitive stress injury when routinely used in a work setting. Certain early pen-based interfaces required the operator to work in this position for much of the workday.[104] Allowing the user to rest their hand or arm on the input device or a frame around it is a solution for this in many contexts. This phenomenon is often cited as an example of movements to be minimized by proper ergonomic design.
Unsupported touchscreens are still fairly common in applications such as ATMs and data kiosks, but are not an issue as the typical user only engages for brief and widely spaced periods.[105]
Touchscreens can suffer from the problem of fingerprints on the display. This can be mitigated by the use of materials with optical coatings designed to reduce the visible effects of fingerprint oils. Most modern smartphones have oleophobic coatings, which lessen the amount of oil residue. Another option is to install a matte-finish anti-glare screen protector, which creates a slightly roughened surface that does not easily retain smudges.
Capacitive touchscreens rarely work when the user wears gloves. The thickness of the glove and the material they are made of play a significant role on that and the ability of a touchscreen to pick up a touch.
Some devices have a mode which increases the sensitivity of the touchscreen. This allows the touchscreen to be used more reliably with gloves, but can also result in unreliable and phantom inputs. However, thin gloves such as medical gloves are thin enough for users to wear when using touchscreens; mostly applicable to medical technology and machines.
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