Photo-sensor Type Touch Panel System
Date Issued
2008
Date
2008
Author(s)
Tang, Shao-En
Abstract
Touch Panel Integration on Glass is a new proposal for recent display technology. The way to produce is to add photo-sensor structure in TFT Pixel Array, then to integrate touch panel function into 15 inch a-Si TFT-LCD panel, and to enable the display panel with Light-Pen Input Display or Finger Sensing Input Display function. We embedded a-Si photo sensors every 4 lines of gate lines and data lines into 15 inch LCD panel with resolution of XGA 1024x768 to let the sensor line resolution to reach 256x192. Either use fingers to block the light or use the light pen to put the strong light on the touch panel, we allow the touch panel create movements. When use fingers to block the ambient light it will have analog signal output, then through ADC to transfer analog signal to digital signal which is acceptable by computers. FPGA provides timing chart to analog board, through SPI interface to C8051, then through USB convey to PC, and the software touch control drivers in the computer will integrate all the components and edit them to calculate, finally show the position that users been touched on the screen. The biggest advantage of photo-sensor touch panel is to lower the cost, improve the transmittance, long lasting, reduce the thickness, and improve the calibration problems of capacitive touch panel.
Subjects
LCD
photo-sensor
touch panel
driver
Type
thesis
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