24-11-2010, 12:07 PM
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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
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
