.

Optical touch screens
Toshiba / Matsushita optical pen touch screen. "An optical sensor and processor are literally embedded into the display’s glass, enabling it to read signals from an optical pen. The end result may be the same as a touch screen, but since the entire system is integrated into the glass of the LCD itself, you don’t have any of the contrast/brightness loss or hardware overhead that is normally associated with slapping a pressure or capacitative sensitive membrane on top of a standard LCD."

maksudnya tidak perlu ditekan kuat2, agar tidak mudah rusak perantinya

Saya memilih "sensor optik" berdasarkan penjelasan dibawah ini.



NextWindow's Optical Touch Screen Technology
NextWindow's optical touch screen technology uses two optical sensors located at the corners of the screen. The optical sensors track the movement of any object close to the surface by detecting the interruption of an infra-red light source. The light is emitted in a plane across the surface of the screen and can be either active (infra-red LED) or passive (special reflective surfaces).

At the heart of the system is a printed circuit controller board. The controller receives signals from the optical sensors and runs software that compensates for optical distortions and triangulates the position of the finger (or any object) extremely accurately.



--------------------------------------------------
Note added at 18 hrs (2009-06-25 20:59:44 GMT)
--------------------------------------------------

Some of NextWindow's products, such as the 1900 Touch Assembly, use low-profile optical sensors mounted on the surface of the glass. Other products use different configurations.

In all models, the infrared light source and optical sensors are synchronised using a sophisticated algorithm, which also eliminates the effect of ambient light.