19-08-2010, 06:37 AM
Hello there would like to have the abstact and PPT,and would like to know about the technical details also
19-08-2010, 06:37 AM
Hello there would like to have the abstact and PPT,and would like to know about the technical details also
04-10-2010, 09:22 AM
TOUCH SCREEN TECHNOLOGY.ppt (Size: 1,020.5 KB / Downloads: 332) This article is presented by:SHREEPADH r.g TOUCH SCREEN TECHNOLOGY
History
Touch Screen have become commonplace since the invention of the electronic touch interface in 1971 by Dr. Samuel C. Hurst. They have become familiar in retail settings, on point of sale systems What is touch screen Touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching picture or words on the screen Touch screen are used with Information Kiosks Computer-based training devices, and systems designed to help individuals who have difficulty manipulating a mouse or keyboard. Types of touch screen There are three types of touch screen technology: Resistive Capacitive Surface wave
06-10-2010, 01:20 PM
Touchscreen.ppt (Size: 897.5 KB / Downloads: 737) Introduction -A touch screen is an input device that allows users to operate a PC by simply touching the display screen. -The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it. -A touch screen is based on CRT (Cathode Ray Tube) technology, that accepts direct onscreen input. -The ability for direct onscreen input is facilitated by an external (light pen) or an internal device (touch overlay and controller) .
07-10-2010, 03:37 PM
Touch Screen technology.ppt (Size: 1.55 MB / Downloads: 280) TOUCH SCREEN Technology Shyam Kishor Choudhary M. Sc. Computer Science & IT(Third Semester) Roll No:3 INTRODUCTION: The first "touch sensor" was developed by Doctor Samuel.This sensor was called the "Elograph". Elographics developed and patented five-wire resistive technology, the most popular touch screen technology in use today. Touch screen monitors have become more and more commonplace since their prices have dropped in the past decade. Touch screens are found in ATMs, cellular phones, airport check-in counters, and many other devices that we use every day. The uses of touch systems as Graphical User Interface (GUI) devices for computers continuous to grow popularity.
29-10-2010, 05:53 PM
touchscreen29.ppt (Size: 2.55 MB / Downloads: 250) TOUCHSCREEN TECHNOLOGY Submitted By :- Md Nazish Aslam 0832EC071029 Submitted To :- Mr. Amit Malik INTRODUCING THE TECHNOLOGY A visual display unit screen that allows the user to give commands to the computer by touching parts of the screen instead of using the keyboard or a mouse. The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it. A touch screen is based on CRT (Cathode Ray Tube) technology, that accepts direct onscreen input.
14-11-2010, 01:00 AM
hi friend i m in 3rd yr in elctronics and communication engineering student i have a seminar on this topic so will u send me immediate full report on TOUCH SCREEN technology plz plz plz
16-11-2010, 04:47 PM
Hi, the full report and ppt is available in the first page of this thread. Please see the remaining other pages of this thread.
24-11-2010, 12:07 PM
Touch Screens.docx (Size: 98.59 KB / Downloads: 144) Touch Screen Introduction A type of display screen that has a touch-sensitive transparent panel covering the screen. Instead of using a pointing device such as a mouse or light pen, you can use your finger to point directly to objects on the screen. Although touch screens provide a natural interface for computer novices, they are unsatisfactory for most applications because the finger is such a relatively large object. It is impossible to point accurately to small areas of the screen. In addition, most users find touch screens tiring to the arms after long use. Touch-screens are typically found on larger displays, in phones with integrated PDA features. Most are designed to work with either your finger or a special stylus. Tapping a specific point on the display will activate the virtual button or feature displayed at that location on the display. A touch screen is an input device that allows users to operate a PC by simply touching the display screen. History In 1971, the first "touch sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky. This sensor, called the "Elograph," was patented by The University of Kentucky Research Foundation. The "Elograph" was not transparent like modern touch screens; however, it was a significant milestone in touch screen technology. In 1974, the first true touch screen incorporating a transparent surface was developed by Sam Hurst and Elographics. In 1977, Elographics developed and patented five-wire resistive technology, the most popular touch screen technology in use today. Touchscreens first gained some visibility with the invention of the computer-assisted learning terminal, which came out in 1975 as part of the PLATO project. Touch screens have subsequently become familiar in everyday life. Companies use touch screens for kiosk systems in retail and tourist settings, point of sale systems, ATMs, and PDAs, where a stylus is sometimes used to manipulate the GUI and to enter data. The popularity of smart phones, PDAs, portable game consoles and many types of information appliances is driving the demand for, and acceptance of, touch screens. Construction There are several principal ways to build a touch screen. 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. In the most popular techniques, the capacitive or resistive approach, there are typically four layers; 1. Top polyester layer coated with a transparent metallic conductive coating on the bottom 2. Adhesive spacer 3. Glass layer coated with a transparent metallic conductive coating on the top 4. Adhesive layer on the backside of the glass for mounting. When a user touches the surface, the system records the change in the electrical current that flows through the display. Touch screen monitors DM Sourcing sells Liquid Crystal Display technologies in a variety of functional business and consumer applications. We provide touch screen monitors in a full range of sizes with multiple options for a broad range of industries including information kiosks, mobile transportation systems, Industrial and medical systems, commercial advertising displays, sports facilities and military equipment. Touch Screen Monitors, Touch Screen LCD Flat Panels Capacitive touch screens consist of a glass panel with a capacitive (charge storing) material coating its surface. Unlike resistive touch screens, where any object can create a touch, they require contact with a bare finger or conductive stylus. When the screen is touched by an appropriate conductive object, current from each corner of the touch screen is drawn to the point of contact. This causes oscillator circuits located at corners of the screen to vary in frequency depending on where the screen was touched. The resultant frequency changes are measured to determine the x- and y- co-ordinates of the touch event. Advantages And Disadvantages of touch screen Advantages • Touch screen displays can be used in fast pace retail or restaurant to speed up the work for the employees and reduce the training time for new employees • Airline's can also use touch screen to their advantage by using the touch screen displays in the airline e ticket machine, this is an advantage because the airline can speed up the process of the customers ordering tickets and queuing up. Disadvantages of touch screen • Some disadvantages are that the user must be within arms reach of the display, it would be difficult to select small items, • It could have a possible retrofit problem (the touch screen must be fitted on the screen), and there could be possible arm fatigue. • It can cause you to feel a little electric shocks if you touch the screen with your wet fingers. • User's hand may obscure the screen. • Screens need to be installed at a lower position and tilted to reduce arm fatigue. • Some reduction in image brightness may occur. • They cost more than alternative devices. Summary All computer display touch systems offer their advantages and Disadvantages in comparison. As previously stated, the resistive system, due to its metallic coated layers, decreases light transmittance and the image is not optimally clear.The capacitive system also reduces the amount of transmitted light, 90% as compared to 75%, again due to its metallic coated capacitive layer. An additional image distortion is present in both systems due to the presence of metal particles is the production of a yellow tint. The yellow tint is most obvious with white and light colored objects.Due to the high traffic nature of their use, the durability of the computer display touch screens is another area of comparison one should consider when considering a purchase
27-11-2010, 11:26 AM
Touchscreen.doc (Size: 522.5 KB / Downloads: 132) Presented By: PATEL JAYENDRA K touch screen technology History of touchscreen? A special thanks goes to Jason Ford of Elo TouchSystems, the company whose founder invented touch screen technology, for providing the following historical information. In 1971, the first "touch sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky. This sensor called the "Elograph" was patented by The University of Kentucky Research Foundation. The "Elograph" was not transparent like modern touch screens, however, it was a significant milestone in touch screen technology. In 1974, the first true touch screen incorporating a transparent surface came on the scene developed by Sam Hurst and Elographics. In 1977, Elographics developed and patented five-wire resistive technology, the most popular touch screen technology in use today. On February 24, 1994, the company officially changed its name from Elographics to Elo TouchSystems. What is Touch screen? A touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen. A type of display screen that has a touch-sensitive transparent panel covering the screen. Instead of using a pointing device such as a mouse or light pen, you can use your finger to point directly to objects on the screen. Touch screens are used with information kiosks, computer-based training devices, and systems designed to help individuals who have difficulty manipulating a mouse or keyboard. Touch screen technology can be used as an alternative user interface with applications that normally require a mouse, such as a Web browser. Some applications are designed specifically for touch screen technology, often having larger icons and links than the typical PC application. Monitors are available with built-in touch screen technology or individuals can purchase a touch screen kit. A touch screen kit includes a touch screen panel, a controller, and a software driver. The touch screen panel is a clear panel attached externally to the monitor that plugs into a serial or Universal Serial Bus (USB) port or a bus card installed inside the computer. The touch screen panel registers touch events and passes these signals to the controller. The controller then processes the signals and sends the data to the processor. The software driver translates touch events into mouse events. Drivers can be provided for both Windows and Macintosh operating systems. Internal touch screen kits are available but require professional installation because they must be installed inside the monitor.Although touch screens provide a natural interface for computer novices, they are unsatisfactory for most applications because the finger is such a relatively large object. It is impossible to point accurately to small areas of the screen. In addition, most users find touch screens tiring to the arms after long use. How Does a Touchscreen Work? A basic touchscreen has three main components: a touch sensor, a controller, and a software driver. The touchscreen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system 1. Touch Sensor A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen. There are several different touch sensor technologies on the market today, each using a different method to detect touch input. The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change. This voltage change is used to determine the location of the touch to the screen. 2. Controller The controller is a small PC card that connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The controller is usually installed inside the monitor for integrated monitors or it is housed in a plastic case for external touch add-ons/overlays. The controller determines what type of interface/connection you will need on the PC. Integrated touch monitors will have an extra cable connection on the back for the touchscreen. Controllers are available that can connect to a Serial/COM port (PC) or to a USB port (PC or Macintosh). Specialized controllers are also available that work with DVD players and other devices. 3. Software Driver The driver is a software update for the PC system that allows the touchscreen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen the same as clicking your mouse at the same location on the screen. This allows the touchscreen to work with existing software and allows new applications to be developed without the need for touchscreen specific programming. Some equipment such as thin client terminals, DVD players, and specialized computer systems either do not use software drivers or they have their own built-in touch screen driver. Touch screen monitors — where you can use your finger on the computer screen to navigate through the contents — have become more and more commonplace over the past decade, particularly at public information kiosks. A basic touch screen has three main components: a touch sensor, a controller, and a software driver. The touch screen is an input device, so it needs to be combined with a display and a PC to make a complete touch input system. The Touch Sensor has a textured coating across the glass face. This coating is sensitive to pressure and registers the location of the user's finger when it touches the screen. The controller is a small PC card that connects the touch sensor to the PC. It takes information from the touch sensor and translates it into information that PC can understand. The Software Driver is a software update for the PC system that allows the touchscreen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. There are three basic systems that are used to recognise a person's touch — Resistive, Capacitive and Surface acoustic wave. The resistive system consists of a normal glass panel that is covered with a conductive and a resistive metallic layer. These layers are held apart by spacers, and a scratch-resistant layer is placed on top of the whole set up. An electrical current runs through the two layers while the monitor is operational. When a user touches the screen, the two layers make contact in that spot. The change in electrical field is noted and coordinates of the point of contact are calculated. Once the coordinates are known, a special driver translates the touch into something that the operating system can understand, much as a computer mouse driver translates a mouse's movements into a click or drag. In the capacitive system, a layer that stores electrical charge is placed on the glass panel of the monitor. When a user touches the monitor with his or her finger, some of the charge is transferred to the user, so the charge on the capacitive layer decreases. This decrease is measured in circuits located at each corner of the monitor. The computer calculates, from the relative differences in charge at each corner, exactly where the touch event took place and then relays that information to the touch screen driver software. One advantage of the capacitive system is that it transmits almost 90 per cent of the light from the monitor, whereas the resistive system only transmits about 75 per cent. This gives the capacitive system a much clearer picture than the resistive system. The surface acoustic wave system uses two transducers (one receiving and one sending) placed along the x and y axes of the monitor's glass plate. Also placed on the glass are reflectors — they reflect an electrical signal sent from one transducer to the other. The receiving transducer is able to tell if the wave has been disturbed by a touch event at any instant, and can locate it accordingly. The wave setup has no metallic layers on the screen, allowing for 100-percent light throughput and perfect image clarity. This makes the surface acoustic wave system best for displaying detailed graphics (both other systems have significant degradation in clarity). Another area in which the systems differ is which stimuli will register as a touch event. A resistive system registers a touch as long as the two layers make contact, which means that it doesn't matter if you touch it with your finger or a rubber ball. A capacitive system, on the other hand, must have a conductive input, usually your finger, in order to register a touch. The surface acoustic wave system works much like the resistive system, allowing a touch with almost any object — except hard and small objects like a pen tip. Technologies There are a number of types of touch screen technology 1. Resistive A resistive touch screen panel is composed of several layers. The most important are two thin metallic electrically conductive and resistive layers separated by thin space. When some object touches this kind of touch panel, the layers are connected at certain point; the panel then electrically acts similar to two voltage dividers with connected outputs. This causes a change in the electrical current which is registered as a touch event and sent to the controller for processing. When measuring press force, it is useful to add resistor dependent on force in this model -- between the dividers. A resistive touch panel output can consist of between four and eight wires. The positions of the conductive contacts in resistive layers differ depending on how many wires are used. When four wires are used, the contacts are placed on the left, right, top, and bottom sides. When five wires are used, the contacts are placed in the corners and on one plate. 4 wire resistive panels can estimate the area (and hence the pressure) of a touch based on calculations from the resistances. Resistive touch screen panels are generally more affordable but offer only 75% clarity[ (premium films and glass finishes allow transmissivity to approach 85% and the layer can be damaged by sharp objects. Resistive touch screen panels are not affected by outside elements such as dust or water and are the type most commonly used today. 5-wire resistive touch screens are very accurate and reliable. Everyone can use them for whatever purpose he or she wants. Our touch screens enlarge the active area to the entire screen, and advance an excellent quality as compared to common displays because of improved flatness and durability of the touché+d surface 8-Wire Resistive Technology Resistive touchscreen technology exists in 4-wire, 5-wire, or 8-wire forms. FastPoint LCD touchscreens specifically employ 8-wire resistive technology because of its benefits over its counterparts. Whereas 8-wire FastPoint touchscreens are available in all sizes, 4-wire resistive technology is restricted to small flatpanels (<10.4"). Additionally, 8-wire resistive touchscreens are not susceptible to problems caused by high-level short-term variances and axis linearity and drift. 1.Polyester Flim 2.Uper Resistive circuit Layer 3.condutive ITO(Transparent metal) 4. Lower Resitive Circuit Layer 5.Insulating Dots 6.Glass/Acrlic Substrate 7.Touching the overlay surface causes the (2) Upper Resistive circuit Layer to contact the (4) Lower Resistive circuit Layer ,producing a circuit switch from the activated area. 8.The touchscreen controller gets the alternating voltages between the (7) two circuit Layer and converts them into the digital X and Y coordinates of the activated area. 2. Surface acoustic wave Surface Acoustic Wave (SAW) technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touch screen panels can be damaged by outside elements. Contaminants on the surface can also interfere with the functionality of the touchscreen. 3.Capacitive A capacitive touch screen panel is coated with a material, typically indium tin oxide that conducts a continuous electrical current across the sensor. The sensor therefore exhibits a precisely controlled field of stored electrons in both the horizontal and vertical axes - it achieves capacitance. The human body is also an electrical device which has stored electrons and therefore also exhibits capacitance. When the sensor's 'normal' capacitance field (its reference state) is altered by another capacitance field, i.e., someone's finger, electronic circuits located at each corner of the panel measure the resultant 'distortion' in the sine wave characteristics of the reference field and send the information about the event to the controller for mathematical processing. Capacitive sensors can either be touched with a bare finger or with a conductive device being held by a bare hand. Capacitive touch screens are not affected by outside elements and have high clarity, but their complex signal processing electronics increase their cost. A capacitive touch screen consists of a glass panel with a capacitive (charge storing) material coating its surface. Circuits located at corners of the screen measure the capacitance of a person touching the overlay. Frequency changes are measured to determine the X and Y coordinates of the touch event. Capacitive type touch screens are very durable, and have a high clarity. They are used in a wide range of applications, from restaurant and POS use to industrial controls and information kiosks. Advantages High touch resolution High image clarity Not affected by dirt, grease, moisture. Disadvantages Must be touched by finger, will not work with any non-conductive input 4.Infrared An infrared touch screen panel employs one of two very different methods. One method used thermal induced changes of the surface resistance. This method was sometimes slow and required warm hands. Another method is an array of vertical and horizontal IR sensors that detected the interruption of a modulated light beam near the surface of the screen. IR touch screens have the most durable surfaces and are used in many military applications that require a touch panel display. 5. Strain gauge In a strain gauge configuration the screen is spring mounted on the four corners and strain gauges are used to determine deflection when the screen is touched. This technology can also measure the Z-axis. Typically used in exposed public systems such as ticket machines due to their resistance to vandalism. 6.Optical imaging A relatively-modern development in touch screen technology, two or more image sensors are placed around the edges (mostly the corners) of the screen. Infrared backlights are placed in the camera's field of view on the other sides of the screen. A touch shows up as a shadow and each pair of cameras can then be triangulated to locate the touch. This technology is growing in popularity, due to its scalability, versatility, and affordability, especially for larger units. 7. Dispersive signal technology Introduced in 2002, this system uses sensors to detect the mechanical energy in the glass that occur due to a touch. Complex algorithms then interpret this information and provide the actual location of the touch. The technology claims to be 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. Also, since mechanical vibrations are used to detect a touch event, any object can be used to generate these events, including fingers and styli. A downside is that after the initial touch the system cannot detect a motionless finger. 8.Acoustic pulse recognition This system uses more than two piezoelectric transducers located at some positions of the screen to turn the mechanical energy of a touch (vibration) into an electronic signal. This signal is then converted into an audio file, and then compared to preexisting audio profile for every position on the screen. This system works without a grid of wires running through the screen, the touch screen itself is actually pure glass, giving it the optics and durability of the glass out of which it is made. It works with scratches and dust on the screen, and accuracy is very good. It does not need a conductive object to activate it. It is a major advantage for larger displays. As with the Dispersive Signal Technology system, after the initial touch this system cannot detect a motionless finger. 9. Frustrated total internal reflection This optical system works by using the principle of total internal reflection to fill a refractive medium with light. When a finger or other soft object is pressed against the surface, the internal reflection light path is interrupted, making the light reflect outside of the medium and thus visible to a camera behind the medium. 10. IntelliTouch surface wave IntelliTouch surface wave is the optical standard of touch. Its pure glass construction provides superior optical performance and makes it the most scratch-resistant technology available. It's nearly impossible to physically "wear out" this touchscreen. IntelliTouch is widely used in kiosk, gaming, and office automation applications and is available for both flat panel and CRT solutions. Benefits • Surface wave (also known as surface acoustic wave, or SAW) technology • Pure-glass touchscreens for superior image clarity, resolution, and light transmission • Durable, scratch-resistant glass surface—continues to work if scratched • Stable "drift-free" operation—for touch response that's always accurate • Finger, gloved hand, and soft stylus activation • Fast touch response • Sensitive touch response—recognizes location and amount of pressure applied 11. SecureTouch Surface Wave Touchscreens Flat-screen SecureTouch products are made of extra-tough glass substrates that resist vandalism. These touchscreens incorporate the solid-glass and coating-free construction of Elo's proven IntelliTouch products. How to connect touchscreen on your own computer? The Add-On Kit can be easily mounted on ANY monitor / Laptops/POS systems and used for ANY mouse driven application. It also help childrens to start learning how to use computer without the difficulty of using the mouse. Easily mounts on ANY standard computer monitor with simple attachments. Touchscreens Add-ons and Integrated Touchscreen Monitors There is main two types of touchscreen products, touchscreen add-ons and integrated touchscreen monitors. Touchscreen add-ons are touchscreen panels that hang over an existing computer monitor. Integrated touchscreen monitors are computer displays that have the touchscreen built-in. Both product types work in the same way, basically as an input device like a mouse or trackpad. Touchscreens As Input Device All of the touchscreens that basically work like a mouse. Once the software driver for the touchscreen is installed, the touchscreen emulates mouse functions. Touching the screen is basically the same as clicking your mouse at the same point at the screen. When you touch the touchscreen, the mouse cursor will move to that point and make a mouse click. You can tap the screen twice to perform a double-click, and you can also drag your finger across the touchscreen to perform drag-and-drops. The touchscreens will normally emulate left mouse clicks. Through software, you can also switch the touchscreen to perform right mouse clicks instead. Development in Touchscreen Virtually all of the significant touchscreen technology patents were filed during the 1970s and 1980s and have expired. Touchscreen component manufacturing and product design are no longer encumbered by royalties or legalities with regard to patents and the manufacturing of touchscreen-enabled displays on all kinds of devices is widespread. The development of multipoint touchscreens 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 acceptance of many kinds of products with an integral touchscreen interface the marginal cost of touchscreen technology is routinely absorbed into the products that incorporate it and is effectively eliminated. As typically occurs with any technology, touchscreen hardware and software has sufficiently matured and been perfected over more than three decades to the point where its reliability is unassailable. As such, touchscreen displays are found today in airplanes, automobiles, gaming consoles, machine control systems, appliances and handheld display devices of every kind. The ability to accurately point on the screen itself is taking yet another step with the emerging graphics tablet/screen hybrids. Ergonomics and usage An ergonomic problem of touchscreens is their stress on human fingers when used for more than a few minutes at a time, since significant pressure can be required and the screen is non-flexible. This can be alleviated with the use of a pen or other device to add leverage, but the introduction of such items can sometimes be problematic depending on the desired use case (for example, public kiosks such as ATMs). Also, fine motor control is better achieved with a stylus, a finger being a rather broad and ambiguous point of contact with the screen. Yet all of these ergonomic issues can be bypassed simply by using a different technique, provided that the user's fingernails are either short or sufficiently long. Rather than pressing with the soft skin of an outstretched fingertip, the finger is curled over, so that the top of the forward edge of a fingernail can be used instead. (The thumb is optionally used to provide support for the finger or for a long fingernail, from underneath.) The fingernail's hard, curved surface contacts the touchscreen at a single very small point. Therefore, much less finger pressure is needed, much greater precision is possible (approaching that of a stylus, with a little experience), much less skin oil is smeared onto the screen, and the fingernail can be silently moved across the screen with very little resistance, allowing for selecting text, moving windows, or drawing lines. (The human fingernail consists of keratin which has a hardness and smoothness similar to the tip of a stylus, and so will not typically scratch a touchscreen.) Alternately, very short stylus tips are available, which slip right onto the end of a finger; this increases visibility of the contact point with the screen. Oddly, with capacitive touch screens, the reverse problem applies in that individuals with long nails have reported problems getting adequate skin contact with the screen to register keystrokes (note that styluses do not work on capacitive touch screens nor do gloved fingers). Future Of Multi-Input Touch Screen We might heard of touch screen and often use in atm’s,mobile etc but that a standard touch screen allows one input at a time.Can you imagine what if this allows multiple people to use it and allows for Minority Report like features.This sort of screens are are recently demonstrate by Jefferson .Y.Han.Its really awesome have a look on this video The display of these screen are really super cool as we use now a day’s on TFT display. Whenever it launches on market, i wish to get one through Loyalty Cards,Well this experiments of multi-input touch screen is revolutionary in the market as it can create many platform for various instruments that needs multi-manpower.
29-11-2010, 06:47 PM
this topic is mind blowing..
30-11-2010, 12:00 AM
i want the seminar topic about"touch screen technology report and ppt",,,,,,,,,,,,,,
30-11-2010, 10:12 AM
hi
the above post containing full details on 'touch screen technology'. you please
23-12-2010, 05:17 PM
Prepared by:TRAILOKYA NATH SASAMAL
Touchscreen technology.ppt (Size: 1,013.5 KB / Downloads: 414) INTRODUCATION TO THE TECHNOLOGY A touch screen is an input device to operate a PC by a touch. Display screen has a sensitive glass overlay placed on it . Direct onscreen input by an external (pen) HOW DOES A TOUCHSCREEN WORK? Main touch screen components: Touch sensor Controller Software driver TOUCH SENSOR A clear glass panel with a touch responsive surface which is placed over a display screen. The responsive area of panel covers the viewable area of the display screen. An electrical current or signal going through it. Touching the screen causes a voltage or signal change. Change determine the location of the touch. CONTROLLER PC card that connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. SOFTWARE DRIVER A software that allows the touch screen and computer to work together. operating system interpret the touch event information that is sent from the controller. Touch screen drivers today are a mouse-emulation type driver. Touchscreen Technology Resistive Touch screen Surface wave Touch screen Capacitive Touch screen *Surface capacitive *Projected capacitive RESISTIVE TOUCH SCREEN Continued… Resistive touch screen monitor is composed of a flexible top layer and a rigid bottom layer separated by insulating dots. The inside surface layers coated with a transparent metal oxide coating Pressing the flexible top sheet creates electrical contact between the resistive layers. The controller gets the alternating voltages between the two layers and X, Y coordinates of the activated area. VS20UA CONTROLLER Supply Voltage 5.0V DC Maximum Current 20mA (Pick) SURFACE WAVE TECHNOLOGY Transmitting and receiving transducers for both axes. The touchscreen controller sends a 5 MHz electrical signal Waves are directed across the front surface by an array of reflectors. Reflectors on the opposite side gather and direct the waves to the receiving transducer. Continued… When we touch , we absorb a portion of the wave traveling across it. The received signal is then compared to the stored digital map, the change recognized, and a coordinate calculated. 2701RSU CONTROLLER Voltage +5 VDC Baud Rate 9600 (default) and 19200 Conversion Time 10 ms per coordinate set CAPACITIVE TOUCH SCREENS Surface Capacitive An uniform conductive coating on a glass panel. Electrodes around the panel's edge distribute a low voltage across the conductive layer & creates an uniform electric field. A finger touch draws current from each corner. Controller measures the ratio of the current flow from the corners.
29-12-2010, 04:18 PM
BY
S.ABDUL KAREEM Touch screen sensor.ppt (Size: 502.5 KB / Downloads: 266) How Does a Touchscreen Work? A basic touchscreen has three main components: 1 Touch sensor; 2 Controller; 3 Software driver. The touchscreen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system. Touch Sensor A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen. There are several different touch sensor technologies on the market today, each using a different method to detect touch input. The sensor generally has an electrical current or signal going through it and touching the screen can cause a voltage or signal change. This change is used to determine the location of the touch to the screen. Controller The controller connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The controller determines what type of interface/connection you will need on the PC. Controllers are available that can connect to a Serial/COM port (PC) or to a USB port. Specialized controllers are also available that work with DVD players and other devices. Software Driver The driver allows the touchscreen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen as same as clicking your mouse at the same location on the screen. This allows the touchscreen to work with existing software and allows new applications to be developed without the need for touchscreen specific programming. Touchscreen Technology Resistive touchscreen Capacitive touchscreen Infrared touchscreen Surface acoustic wave (SAW) touchscreen Strain gauge touchscreen Optical imaging touchscreen Dispersive signal technology touchscreen Resistive touchscreen Structure Resistive touch screens consist of a glass or acrylic panel that is coated with electrically conductive and resistive layers made with indium tin oxide (ITO) .The thin layers are separated by invisible spacers. 4-wire resistive touchscreen 5-wire resistive touchscreen The construction of the panels are similar with 4-wire technology, but for a 5-wire touch screen all four bus bars are connected to the lower, non-flexible layer of the screen. The flexible layer is always used as a sense layer to read the voltage connection point to the bottom layer. 8-wire resistive touchscreen Resistive touchscreen Characters: Cost effective solutions Activated by a stylus, a finger or gloved hand Not affected by dirt, dust, water, or light 75%~85% clarify resistive layers can be damaged by a very sharp object Projected-capacitive touchscreen Structure Projected capacitive touchscreens have front and back protective glassproviding optical and strength enhancement options. Its middle layer consists of a laminated sensor grid of micro-fine wires, andoptical enhancement options. Projected-capacitive touchscreen During a touch, capacitance forms between the finger and the sensor grid.The embedded serial controller in the touchscreen calculates touch location coordinates and transmits them to the computer for processing. Surface-capacitive touchscreen Structure Surface capacitive technology consists of a uniform conductive coating on a glass panel. Electrodes around the panel’s edge evenly distribute a low voltage across the conductive layer, creating a uniform electric field. Surface-capacitive touchscreen Working principle A human body is an electric conductor, so when you touch the screen with a finger, a slight amount of current is drawn, creating a voltage drop. The current respectively drifts to the electrodes on the four corners. Theoretically, the amount of current that drifts through the four electrodes should be proportional to the distance from the touch point to the four corners. The controller precisely calculates the proportion of the current passed through the four electrodes and figures out the X/Y coordinate of a touch point. Capacitive touchscreen Characters: Durable and resistant to scratches for demanding applications Faster and more responsive Immune to surface contaminants Superior optical clarity, brighter display and less surface reflection Must be touched by finger, will not work with any non-conductive input Infrared touchscreen Infrared (IR) technology relies on the interruption of an IR light grid in front of the display screen. The touch frame contains a row of IR-light emitting diode (LEDs) and photo transistors, each mounted on two opposite sides to create a grid of invisible infrared light. The IR controller sequentially pulses the LEDs to create a grid of IR light beams. When a stylus, such as a finger, enters the grid, it obstructs the beams. One or more photo transistors from each axis detect the absence of light and transmit signals that identifies the x and y coordinates. Infrared touchscreen Infrared touchscreen Characters: Clear as glass, improves reading ability Most durable surface SAW touchscreen Principle Surface waves are readily absorbed when a soft object such as a fingertip touches the substrate. SAW Touch Screen use pure glass with transmitting and receiving piezoelectric transducers for both the X and Y axes. The touch screen controller sends an electrical signal to the transmitting transducer, which converts the signal into ultrasonic waves within the glass. When you touch the screen, you absorb a portion of the wave traveling across it. The received signal is then compared to the stored digital map, the change recognized, and a coordinate calculate. SAW touchscreen SAW touchscreen Characters: Durable glass construction High optical clarity Activated by a finger, gloved hand or soft tip Not completely sealable, can be affected by large amounts of dirt, dust, and / or water in the environment Multi-touch technology Multi-touch denotes a set of interaction techniques which allow computer users to control graphical applications with several fingers. Products: Apple iPhone, iPod touch, MacBook Air, and MacBook Pro Microsoft Surface ……
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Touch-Screen.docx (Size: 405.07 KB / Downloads: 229) Submitted by SANJEEEV KUMAR Under Guidance of Mr.B.R.Ambedkar INSTITUTE OF ENGINERRING & TECHNOLOGYROHILKHAND UNIVERSITY, BAREILLY Abstract First computers became more visual, then they took a step further to understand vocal commands and now they have gone a step further and became ‘TOUCHY’, that is skin to screen. A touch screen is an easy to use input device that allows users to control PC software and DVD video by touching the display screen. A touch system consists of a touch Sensor that receives the touch input, a Controller, and a Driver. The most commonly used touch technologies are the Capacitive & Resistive systems. The other technologies used in this field are Infrared technology, Near Field Imaging & SAW (surface acoustic wave technology). These technologies are latest in this field but are very much expensive. The use of touch systems as Graphical User Interface (GUI) devices for computers continues to grow popularity. Touch systems are used for many applications such as ATM’s, point-of–sale systems, industrial controls, casinos & public kiosks etc. Touch system is basically an alternative for a mouse or keyboard. The market for touch system is going to be around $2.5 billion by 2004. Various companies involved in development of touch systems mainly are Philips, Samsung etc. Even touch screen mobile phones have been developed by Philips. INTRODUCTION A touch screen is computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen. Touch screen are used with information kiosks (an interactive computer terminal available for public use, as one with internet access or site specific information), computer based training devices, and system designed to help individuals who have difficulty in manipulating a mouse or keyboard. Touch screen technology can be used as an alternative user interface with application that normally requires a mouse, such as a web browser. Some applications are designed specifically for touch screen technology, often having larger icon and link than typical PC application. Monitors are available with built in touch screen kit. A touch screen kit includes a touch screen panel, a controller, and a software driver. The touch screen panels are is a clear panel attached externally to the monitors that plug in to a serial or a universal serial Bus (USB) port a bus Card installed inside the computer. The touch screen panel registers touch event and passes these signal to controller. The controller then processes the signals and sends the data to the processor. The software driver translates the touch events into mouse events. Driver can be provided for both Window and Macintosh operating systems. Internal touch screen kits are available but require professional installation because the must be installed inside the monitors. HISTORY OF TOUCH SCREEN TECHNOLOGY Dr. Sam Hurst, founder of Elographics, developed the first “touch screen” while he was an instructor at the university of Kentucky in 1971. Ten stockholders founded Elographics, Inc. in March 1971, to produce Graphical data Digitizers for use in research and industrial application, with the, principal being Dr. Sam Hurst. He was on leave from the Oak Ridge National Laboratory to tech at the University of Kentucky for two years, where he was faced with a need to read a huge stack of strip chart data. It would have taken two graduate student s approximately two month to do the task. He started to thinking of a way to read the and during the process, the “Elograph” (Electronic graphics) coordinate measuring system and Elographics the company were born. The University Kentucky research foundation applied for and was granted a patent on the Elograph. The foundation granted an exclusive license to Elographics. The touch screen is one of the easiest to use and most intuitive of all PC interface of choices from a wide variety of applications. A touch interface to allow users to navigate a computer system by touching icon or links on the screen. The Benefits of Touch Screen • Reduce training expenses Touch screen system are far easier to learn then traditional keyboard based. Everyday retail function like Selection tender, editing and voiding line items and capturing customer demographic information are made intuitive by virtue of the touch screen- and the right touch screen software. Many retailers, especially those in the service sector, sell items that cannot be easily bar coded. Touch system make it easy to ring up these items and of course, still to allow the use of all standard bar coded technologies. Studies show reduction in training time in excess of 50% can be expected. Enhanced POS function can be added with the knowledge that employees will be able to utilizes them quickly and easily. • Improve customer Service If your customer have to wait for your employees to figure out how to use the store’s system , you are going lose costumer. Touch screen system eliminate this embarrassing and all too common, problem. Today’s retailers need to learn as much as possible about there customers needs and buying habits. Capturing customers information is a snap with touch screen POS systems. • Reduce Transaction Times Studies show touch screen systems process transactions up to 60% faster than traditional keyboard POS systems. One info touch’ customer has clocked in with a traction rate of over 60 per Hrs. per register, over 20,000per day-with volunteers. • Decrease Cost In a touch screen POS system, the lay out of the color coded “keys” is stored in file on your hard drive. Change to the layout can be accomplished during the nightly poll of store data the time and expense of changing hardware key caps is eliminated. How Does a Touch Screen Work? A basic touch screen has three main components: a touch sensor, a controller, and a software driver. The touch screen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system. Touch Sensor A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen. There are several different touch sensor technologies on the market today, each using a different method to detect touch input. The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change. This voltage change is used to determine the location of the touch to the screen. Controller The controller is a small PC card that connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The controller is usually installed inside the monitor for integrated monitors or it is housed in a plastic case for external touch add-ons/overlays. The controller determines what type of interface/connection you will need on the PC. Integrated touch monitors will have an extra cable connection on the back for the touch screen. Controllers are available that can connect to a Serial/COM port (PC) or to a USB port (PC or Macintosh). Specialized controllers are also available that work with DVD players and other devices. Software Driver The driver is a software update for the PC system that allows the touch screen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen the same as clicking your mouse at the same location on the screen. This allows the touch screen to work with existing software and allows new applications to be developed without the need for touch screen specific programming. Some equipment such as thin client terminals, DVD players, and specialized computer systems either do not use software drivers or they have their own built-in touch screen driver. we offer two main types of touch screen products, touch screen add-ons and integrated touch screen monitor. Touch screen add-ons are touch screen panels that hang over an existing computer monitor. Integrated touch screen monitors are computer displays that have the touch screen built-in. Both product types work in the same way, basically as an input device like a mouse or track pad. Diversity of touch Screen Resistive this technology uses to layers of conductive material to create an X/Y grid (vertical lines on one surface, horizontal). When pressure is applied to the flexible top layer, the grid surfaces come in contact and allow current to flow. The presence of current in a vertical and horizontal line gives the X/Y coordinate of the touch. Because the screen itself supplies all current, workers with heavy gloves can work this type of screen. The draw back to resistive screen is that they are subject to scratches, burns and others type of damage to protect against damage, companies such as DynaPro apply and additional Mylar over laminate, which can be replaced if damaged. |
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