26-01-2011, 09:21 PM
thanks it is so useful for me
26-01-2011, 09:21 PM
thanks it is so useful for me
17-02-2011, 11:24 PM
PLEASE SEND FULL REPORT AND PPT ON TOUCH SCREEN
21-02-2011, 02:07 PM
18666348-Touch-Screen-Technology.pdf (Size: 1.01 MB / Downloads: 425) Touch Screen technology A touchscreen is a display which can detect the presence and location of a touch within the display area. • The term generally refers to touch or contact to the display of the device by a finger or hand. History • In 1971, the first "touch sensor" was developed by Doctor Sam Hurst (founder of Elographics). • This sensor called the "Elograph“ . • The "Elograph" was not transparent like modern touch screens; however, it was a significant milestone in touch screen technology. • On February 24, 1994, the company officially changed its name from Elographics to Elo Touch Systems. Touch Screen Technology • A basic touchscreen has three main components: ▫ Touch sensor ▫ Controller ▫ Software driver. 1.Touch Sensor • A touch screen sensor is a clear glass panel with a touch responsive surface. • 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. 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. Types of Technologies • There are three basic systems that are used to recognize a person's touch: Resistive Capacitive Surface acoustic wave Resistive Touch Screen technology • The resistive system consists of a normal glass panel that is covered with a conductive and a resistive metallic layer. • These two layers are held apart by spacers. • An electrical current runs through the two layers while the monitor is operational. The change in the electrical field is noted and the coordinates of the point of contact are calculated by the computer. • Once the coordinates are known, a special driver translates the touch into something that the Operating System.
21-02-2011, 02:35 PM
44639803-Seminar-Report-u07ec420.pdf (Size: 606.38 KB / Downloads: 218) Touch Screen and Future Interfacing Devices Abstract In the 21st century , when technology is at par with what sometime back was called as Science fiction , there is extensive acceptance of innovative , newer , smaller and user friendly interfacing Devices. The most common of the recent 20th century are the Touch Screens. Touch screen is the Interfacing Device of the New Age. It is an Input as Well as Output device. It is a 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. As Touch screen’s are very intuitive , they are now commonly used in Smart Phones , LCD attachments , ATM machines , Camera , Industrial Machine Use , Hospital Machines, Single-touch buttons are found in everything around the home, office, or anywhere in between: cell phones, landline phones,remote controls, televisions, computers and all of its peripherals, gaming systems, refrigerators, ovens, toasters, car interior controls like radio and air conditioning, and so on and the best part is any LCD screen can be converted into a Touch screen for convenience. Touch screen and future interfacing devices would be discussed further. What is Touch screen? A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Why Touch Screens? The touch screen has two main characteristics; it facilitates one to interact with what is displayed straightforwardly on the screen, rather than indirectly with a mouse or touchpad and it lets one perform the touch operations without necessitating any middle device. Such touch screen displays can be connected to computers, laptops, PDAs, cell phones etc. They also project an important function in the blueprint of digital. Touch screen monitors are a way to both input information and receive information from a single peripheral device (usually a monitor screen). Instead of using a keyboard or mouse, you can easily input data directly into the touch screen where you are also able to receive information 2.1 Types of Touch Technology[6,9] Touch-screen technology falls into categories: resistive, capacitive and surface wave. Each technology has strengths suited for specific applications. Resistive A resistive touch screen display is composed of a standard glass sheet that is coated with a thin conductive and a resistive metallic sheet. These two levels are kept separated by spacers (objects positioned between two or more sheets of glass in order to retain a uniform width between the glasses and avoid sealant deformation). A scratch-resistant coating is positioned above the entire arrangement. An electrical current travels between the two layers while the monitor is being used. When a user makes contact with the display, the two layers touch each other contact in same location. The modification in the electrical current is identified and the coordinates of the touch are computed by the computer. An exceptional driver program then transforms the touch into a language which the computer can comprehend. Being quite reasonably priced they only offer about 75 percent clarity. They can also be easily damaged by objects that are sharp. Resistive touch screen monitors are the most popular types of touch screen monitors used today. They are usually not effected by dust or liquids which make them very reliable. Surface wave. [ 8 ] Surface wave touch screen monitors use ultrasonic waves to process inputs from the screen. A surface wave touch screen display is composed of two transducers (acting as receivers and senders) positioned along the X and Y axis of the display’s glass layer. Reflectors are placed on the glass layer which reflects an electrical signal propelled from one transducer to the other. The receiving transducer is capable to identify if the signal has been altered by a touch at any moment, and can trace it consequently. Ultrasonic waves flow over the touch screen, when a person touches the pad at a specific location, the wave is absorbed and immediately processed by the computer. The wave arrangement has no metallic coatings on the display, permitting for 100 percent light throughput and ideal picture clearness. This formulates the surface wave touch screen display as finest for exhibiting detailed pictures. While not as common as resistive touch panels, they are used in certain applications. Dust and water can contaminate a surface wave touch screen so it is important to keep the screens properly maintained.
25-02-2011, 09:48 AM
touchscreen report.doc (Size: 176 KB / Downloads: 315) ABSTRACT TOUCH SCREEN 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 touchscreen 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 uses 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 touchscreen is an easy to use input device that allows users to control PC software and DVD video by touching the display screen. We manufacture and distribute a variety of touch screen related products. A touch system consists of a touch Sensor that receives the touch input, a Controller, and a Driver. The touch screen sensor is a clear panel that is designed to fit over a PC. When a screen is touched, the sensor detects the voltage change and passes the signal to the touch screen controller. The controller that reads & translates the sensor input into a conventional bus protocol (Serial, USB) and a software driver which converts the bus information to cursor action as well as providing systems utilities. As the touch sensor resides between the user and the display while receiving frequent physical input from the user vacuum deposited transparent conductors serve as primary sensing element. Vacuum coated layers can account for a significant fraction of touch system cost. Cost & application parameters are chief criteria for determining the appropriate type determining the system selection. Primarily, the touch system integrator must determine with what implement the user will touch the sensor with & what price the application will support. Applications requiring activation by a gloved finger or arbitrary stylus such as a plastic pen will specify either a low cost resistive based sensor or a higher cost infra-red (IR) or surface acoustic wave (SAW) system. Applications anticipating bare finger input or amenable to a tethered pen comprises of the durable & fast capacitive touch systems. A higher price tag generally leads to increased durability better optical performance & larger price. The most commonly used systems are generally the capacitive & resistive systems. The other technologies used in this field are Infrared technology & SAW (surface acoustic wave technology) these technologies are latest in this field but are very much expensive.
25-02-2011, 06:28 PM
pls send me touch screen technology report and ppt...
25-02-2011, 06:52 PM
i am in need of touch screen technology report and ppt..pls send me
26-02-2011, 11:02 AM
Touch Screens 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.Some phones with this feature can also recognize handwriting written on the screen using a stylus, as a way to quickly input lengthy or complex information A touchscreen is an input device that allows users to operate a PC by simply touching the display screen. Touch input is suitable for a wide variety of computing applications. A touchscreen can be used with most PC systems as easily as other input devices such as track balls or touch pads. Browse the links below to learn more about touch input technology and how it can work for you. History Of Touch Screen Technology A touch screen is a special type of visual display unit with a screen which is sensitive to pressure or touching. The screen can detect the position of the point of touch. The design of touch screens is best for inputting simple choices and the choices are programmable. The device is very user-friendly since it 'talks' with the user when the user is picking up choices on the screen. Touch technology turns a CRT, flat panel display or flat surface into a dynamic data entry device that replaces both the keyboard and mouse. In addition to eliminating these separate data entry devices, touch offers an "intuitive" interface. In public kiosks, for example, users receive no more instruction than 'touch your selection. Specific areas of the screen are defined as "buttons" that the operator selects simply by touching them. One significant advantage to touch screen applications is that each screen can be customized to reflect only the valid options for each phase of an operation, greatly reducing the frustration of hunting for the right key or function. Pen-based systems, such as the Palm Pilot® and signature capture systems, also use touch technology but are not included in this article. The essential difference is that the pressure levels are set higher for pen-based systems than for touch.Touch screens come in a wide range of options, from full color VGA and SVGA monitors designed for highly graphic Windows® or Macintosh® applications to small monochrome displays designed for keypad replacement and enhancement. Specific figures on the growth of touch screen technology are hard to come by, but a 1995 study last year by Venture Development Corporation predicted overall growth of 17%, with at least 10% in the industrial sector.Other vendors agree that touch screen technology is becoming more popular because of its ease-of-use, proven reliability, expanded functionality, and decreasing cost. This deals with the new technology named ‘Touch Screen’. By this, technology the purpose means just in the name touch the screen and activate instructions. Instead of the keyboard or mouse we can operate or stimulate an instruction or command by touching on the screen by our finger.And through this seminar trying to explain about the touch screen, the advantages and major marketing areas where the touch screens used and some applications.This technology is nothing but software with CPU like hardware and touch screen technology digital camera. This technology will obviously bring much developments in the e-commerce sector. The benefit of using such kiosks is to bring down human efforts and to increase the customer services. The future development of wide area networks based on ISDN will permit retailers to update their kiosks on a regular basis over night if necessary. Customers will be able to carry out an increasing range of transactions using smart Cables and Satalite as well as telephone lines, can be used to deliver information and retail services to the home..
28-02-2011, 05:01 PM
i need computer science touch screen technology report and ppt
08-03-2011, 04:16 PM
Submitted by
Juned shaikh Salahuddin shaikh TOUCH SCREEN.ppt (Size: 247.19 KB / Downloads: 186) TOUCH SCREEN TECHNOLOGY Introduction Definition:- “ A computer display screen ,sensitive to human touch, allowing user to interact with computer by touching on screen” . * works instantly with all programs like mouse . * touch event is registered when finger touches screen . * components making a complete touch system :- 1. A touch sensor . 2. A controller . 3. A s/w driver . How does a touch screen works ? 1. A touch sensor - * a glass panel with touch responsive surface . * covers whole viewable area . * touching the screen causes voltage change , input for controller . 2. A controller - * interface between sensor & PC . * converts voltage change into digital signal . * type of interface required 3. A s/w driver - * touch screen & PC works together . * converts touch events into mouse events . Types of touch screens 3 major types- 1. Resistive touch screens 2. Capacitive touch screens 3. Surface acoustic wave Comparison of different touch screens System requirements O . S . : Ms Dos version 5.0+windows 3.0, windows ME/2000/XP/7/Linux Processor: 386 PC compatible or higher Disk : 2MB of free space hard disk , 3.5”(1.44MB) floppy drive Memory : 14kb resident memory K/B : Not required after installation Video : ½ MB SVGA or higher Ports : RS 232, mouse port or USB(depends on type) Touch screen strengths • Convenience of push button control • Easy enough for a child to use • All output and inputs are done through one device • 3-5 times faster than a speeding mouse • No dragging mouse to each starting point • More intuitive than other input devices Lasts (2-5 times) longer than a mouse. • Low maintenance. • No training needed (push button control)
08-03-2011, 10:19 PM
thanx,bt i need 50pages docment on this plz send whole doc to my e-mail ------raj.mydhams[at]gmail.com
15-03-2011, 08:14 PM
Touchscreen
Sudheesh.S & Dino P Ponnachan Electronics & Communication Mohandas College of Engineering and Technology Touchscreen.pdf (Size: 201.38 KB / Downloads: 210) Abstract A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touchscreens can also sense other passive objects, such as a stylus. Although the touchscreen technology dates back to about forty years ,it has made a revolution in the past five years with its application into devices that we deal in our day to day life .There are basically three underlying technologies used in touchscreens ,namely Resitive,,Capacitive and Acoustic. The latest developments in touchscreen technology are Multitouch and Haptic Touch. Introduction A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The touchscreen has two main attributes. First, it enables one to interact directly with what is displayed, rather than indirectly with a cursor controlled by a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate device that would need to be held in the hand. Such displays can be attached to computers, or to networks as terminals. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices, mobile phones, and video games. History The prototype x-y mutual capacitance touchscreen (left) developed at CERN in 1977 by Bent Stumpe, a Danish electronics engineer, for the control room of CERN’s accelerator SPS (Super Proton Synchrotron). 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. The Main Components of Touch Screen Every touch screen has three main components: digital signal that computer can understand Touch Sensitive Surface The touch sensitive surface is an extremely durable and flexible glass or polymer touch response surface, and this panel is placed over the viewable area of the screen. In most sensors there is an electric signal going across the screen, and a touch on the surface causes change in the signal depending on the touch sensor technology used.This change allows the controller to identify the location of the touch. • The Controller The controller is a device that acts as the intermediate between the screen and the computer. It interprets the electrical signal of the touch event to. The controller can be placed with the screen or housed externally. • The Software Driver The software driver is an interpreter that converts what signal comes from the controller to information that the operating system can understand. Technologies 1.Resistive A resistive touchscreen panel is composed of several layers, the most important of which are two thin, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point: the panel then behaves as a pair of 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. 2.Capacitive A capacitive touchscreen panel is one which consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO). As the human body is also a 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.The different technologies under capacitive sensing are Surface capacitance, Projected capacitance, Mutual Capacitance, Self Capacitance. 3. Surface acoustic wave 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. 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 Other Technologies 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 input including a finger, gloved finger, stylus or pen.Unlike capacitive touchscreenspatterning on the glass which increases durability and optical clarity of the overall system. Optical imaging This is a relatively modern development in touchscreen technology, in which two or more image sensors are placed around the edges (mostly the corners) of the screen. Infrared back lights are placed in the camera's field of view on the other side of the screen. A touch shows up as a shadow and each pair of cameras can then be triangulated to locate the touch or even measure the size of the touching object . This technology is growing in popularity, due to its scalability, versatility, and affordability, especially for larger units. Dispersive signal technology This system uses sensors to detect the mechanical energy in the glass that occurs 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 stylus. A downside is that after the initial touch the system cannot detect a motionless finger. Acoustic pulse recognition This system uses piezoelectric transducers located at various positions around the screen to turn the mechanical energy of a touch (vibration) into an electronic signal. The screen hardware then uses an algorithm to determine the location of the touch based on the transducer signals. The touchscreen itself is made of ordinary glass, giving it good durability and optical clarity. It is usually able to function with scratches and dust on the screen with good accuracy. The technology is also well suited to displays that are physically larger. As with the Dispersive Signal Technology system, after the initial touch, a motionless finger cannot be detected. However, for the same reason, the touch recognition is not disrupted by any resting objects. Refernces • Shneiderman, B. (1991). "Touch screens now offer compelling uses". IEEE Software 8 (2): 93–94, 107. • Potter, R.; Weldon, L. & Shneiderman, B. (1988). Improving the accuracy of touch screen: An experimental evaluation of three strategies. Proc. CHI'88. Washington, DC: ACM Press. pp. 27–32. • Sears, A.; Plaisant, C. & Shneiderman, B. (1992). "A new era for high precision touchscreens". In Hartson, R. & Hix, D.. Advances in Human-Computer Interaction. 3. Ablex, NJ. pp. 1–33 . • http://en.wikipediawiki/Touchscreen"C ategories: Touchscreens | Computer hardware • Howstuffworks - How do touchscreen monitors know where you're touching? . • MERL - Mitsubishi Electric Research Lab (MERL)'s research on interaction with touch tables. . • Jefferson Y. Han et al. Multi-Touch Interaction Research. Multi-Input Touchscreen using Frustrated Total Internal Reflection
26-03-2011, 10:50 AM
Presented by:
Quanling zheng Touch screen sensor.ppt (Size: 817 KB / Downloads: 263) Touch Screen Sensor 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: 1. Cost effective solutions 2. Activated by a stylus, a finger or gloved hand 3. Not affected by dirt, dust, water, or light 4. 75%~85% clarify 5. resistive layers can be damaged by a very sharp object Projected-capacitive touchscreen • Structure Projected capacitive touchscreens have front and back protective glass providing optical and strength enhancement options. Its middle layer consists of a laminated sensor grid of micro-fine wires, and optical enhancement options. • 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. 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: 1. Durable and resistant to scratches for demanding applications 2. Faster and more responsive 3. Immune to surface contaminants 4. Superior optical clarity, brighter display and less surface reflection 5. 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. • Characters: 1. Clear as glass, improves reading ability 2. 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. • Characters: 1. Durable glass construction 2. High optical clarity 3. Activated by a finger, gloved hand or soft tip 4. 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
28-03-2011, 03:34 PM
PRESENTED BY
B.LAKSHMAN TOUCH SCREEN TECHOLOGY.pptx (Size: 785.3 KB / Downloads: 95) TOUCH SCREEN TECHNOLOGY COMPONENTS Three major components Touch sensor Controller Software driver TOUCH SENSORS A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen. Sensors detects electrical current or signal. Touching causes a voltage or signal change, there by the location can be determined. CONTROLLER The controller is a small PC card that connects between the touch sensor and the PC It takes information from the touch sensor It translates information into the PC that can understand SOFTWARE DRIVER It act as a bridge between the screen and the processor The driver is a software that allows the touch screen and processor to work together. Most of the touch screen drivers today are mouse emulation type driver . Technologies Resistive Touch screen Surface wave Touch screen Capacitive Touch screen Resistive touch screen Structure Resistive touch screens consist of a glass panel that is coated with electrically conductive and resistive layers made with indium tin oxide (ITO) .The thin layers are separated by invisible spacers. CONTROLLER Supply Voltage ◦ 5.0V DC Maximum Current ◦ 20mA Resolution ◦ 12-bit SURFACE WAVE TOUCH SCREEN SURFACE WAVE SENSORS Contains Transmitting and receiving transducers. It uses ultrasonic waves that pass over the touch screen panel. When the panel is touched the wave is absorbed and sends this information to the controller for processing. CONTROLLER Voltage ◦ +5 VDC Baud Rate ◦ 9600 Touch Resolution ◦ 12bit, size independent ◦ Conversion Time ◦ 10 ms per coordinate set Capacitive Touch screen: It is a four multi-layer glass. A human body is an electric conductor, so when touched 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. The capacitive system has very long life (about 225 million clicks). CONTROLLER o Supply Voltage: ◦ +5 V DC or +12V Baud Rate ◦ 9600 (default) and 19200 Touch Resolution ◦ 12bit, size independent. Conversion Time ◦ Approximately 15 ms per coordinate set Advantages & Disadvantages: Advantages: Fast response. Error free input. Easy to install. Easy to clean and maintain. Compatible with Windows ,and Linux. Disadvantages: Finger stress: Stress on human fingers when used for more than a few minutes at a time. (for example, ATMs). Fingerprints: Touch screens can suffer from the problem of fingerprints on the display. User has to sit closer to the screen as compared to external keyboard. The screen may be covered more by using hand. Applications General Stores Restaurants ATM’S Digital Computer Mobile Phones
29-03-2011, 11:58 AM
PRESENTED BY:
Vijay s. waghmode New TOUCH SCREEN Presentation.pptx (Size: 246.53 KB / Downloads: 89) Touch Screen Technology Liquid Crystal Display (LCD) Technology The characteristics of LCD monitors – small size with high resolution, image lag, low power consumption and ability to show static images for longer times without burn-in – make them suitable for non-residential applications and some small-screen residential applications such as personal computing and keypad controls. But for custom installation home entertainment systems, LCD’s fall short Digital Camera Technology Untangled Every technology has its limits Digital Point-and-Shoot cameras are pushing the technological envelope so hard that some pundits are predicting the imminent demise of consumer-level Digital SLR cameras. Even $200 digi cams (Digital Cameras) produce pictures that delight casual shooters, and fancier models are on offer all the way to $1,000, way past the prices Flat Screen TV Comparison: Plasma vs LCD Flat screen TV is one of the most popular and exciting TV technologies today. At only a few inches thick, flat screen TVs offer unparalleled flexibility and convenience. Older conventional TV’s, in fairness to them, did offer crisp and vibrant images. However, these TV’s, which operate through a cathode ray tube (CRT), suffered from one major drawback ONE Windows Shell Programming With each operating system release, service pack, and Internet Explorer upgrade, Microsoft adds more possibilities for vendors to extend and … … Windows user interface. This has been the case with earlier versions of Windows through its latest release, Windows 2000. Window shell programming iPhone Review When you fire up Color Curious, the program prompts you to select a picture to analyze, either by taking a quick shot of something around you, or by selecting one from your own gallery of pictures. Once you’ve selected an image, the crosshairs in the center of the screen help you pinpoint any color Memory – DDR1, DDR2, and DDR3 DDR1 Double Data Rate-SDRAM, or simply DDR1, was designed to replace SDRAM. DDR1was originally referred to as DDR-SDRAM or simple DDR. When DDR2 was introduced, DDR became referred to as DDR1. Names of components constantly change as newer technologies are introduced, especially when the newer technology is based on a previous e one |
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