한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
권호 표지

Large-size LCD with touch-sensing capability

  • Zhu, X.L. (Applied Science and Technology Research Institute, Hong Kong Science Park) ;
  • Sit, Cass K.M. (Applied Science and Technology Research Institute, Hong Kong Science Park) ;
  • Ma, Mark W. (Applied Science and Technology Research Institute, Hong Kong Science Park) ;
  • Feng, Y.J. (Applied Science and Technology Research Institute, Hong Kong Science Park) ;
  • Ng, K.W. (Applied Science and Technology Research Institute, Hong Kong Science Park)
  • Published : 2009.10.12
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Abstract

We describe a 32" liquid-crystal display (LCD) with multi-touch sensing capability by integrating IR detector arrays onto the LED backlight plate. A transparent light guide is placed in front of the display screen, with IR LEDs disposed at its edges and emitting IR light into the light guide, the light is trapped by total internal reflection within the light guide to be as touch-sensing light. A physical contact with the acrylic plate surface will stimulate some trapped light to be escaped from the light guide and pass through LCD panel to be detected by the IR detectors. The touch-sensing LCD with this configuration can locate simultaneous multiple touche points on the touchable surface.

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