10-11-2012, 04:15 PM
TOUCHSCREEN TECHNOLOGY
[attachment=38984]
INTRODUCING THE TECHNOLOGY
A touchscreen is an input device that allows users to operate a PC by simply touching the display screen giving the output in he same page.
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 which is facilitated by an external (light pen) or an internal device ( touchscreen overlay and controller)
1-TOUCH SENSOR
It is a clear glass panel with a touch sensitive surface which is placed over a display screen so that the responsive area of the panel covers all the viewable area of the display screen. (see the picture)
Generally an electrical current or signal goes through it and touching the screen causes a voltage / signal change. This change is responsible for the determination of 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.
SOFTWARE DRIVER
This is a software that allows touch screen and computer to compatibility . It helps the computer's operating system to interpret the touch event information that is sent from the controller.
This makes touching the screen the same as clicking your mouse at the some location on the screen as most touch screen drivers today are a mouse-emulation type driver.
SURFACE WAVE TECHNOLOGY
It has a transmitting and receiving transducers for both the X and Y axes.
The touchscreen controller sends a five-megahertz electrical signal to the transmitting transducer, which converts the signal into ultrasonic waves within the glass.
These waves are directed across the front surface of the touchscreen by an array of reflectors.
Reflectors on the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal—a digital map of the touchscreen
[attachment=38984]
INTRODUCING THE TECHNOLOGY
A touchscreen is an input device that allows users to operate a PC by simply touching the display screen giving the output in he same page.
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 which is facilitated by an external (light pen) or an internal device ( touchscreen overlay and controller)
1-TOUCH SENSOR
It is a clear glass panel with a touch sensitive surface which is placed over a display screen so that the responsive area of the panel covers all the viewable area of the display screen. (see the picture)
Generally an electrical current or signal goes through it and touching the screen causes a voltage / signal change. This change is responsible for the determination of 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.
SOFTWARE DRIVER
This is a software that allows touch screen and computer to compatibility . It helps the computer's operating system to interpret the touch event information that is sent from the controller.
This makes touching the screen the same as clicking your mouse at the some location on the screen as most touch screen drivers today are a mouse-emulation type driver.
SURFACE WAVE TECHNOLOGY
It has a transmitting and receiving transducers for both the X and Y axes.
The touchscreen controller sends a five-megahertz electrical signal to the transmitting transducer, which converts the signal into ultrasonic waves within the glass.
These waves are directed across the front surface of the touchscreen by an array of reflectors.
Reflectors on the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal—a digital map of the touchscreen