21-02-2011, 02:07 PM
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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.
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.
