| 摘要 |
<p>PURPOSE:To obtain a thin and light-weighted I/O device reduced at its power consumption by forming photoelectric conversion elements in an LCD and combining said conversion element with a light emitting type light pen. CONSTITUTION:A thin film transistor (TFT) photodiode substrate 10 is formed as one cell substrate constituting a liquid crystal cell. A liquid crystal driving TFT and photodiodes for detecting the light of the light pen are simultaneously formed on the substrate. To read out which diode receives light from the light pen, one end of the photodiode is connected to the gate line 11' of the TFT and the other end to a data reading line 18. Thus, the photoelectric conversion elements such as photodiodes are formed on a color liquid display panel correspondingly to respective picture elements 16, the light pen is scanned on the display screen and its light is detected by said elements. Consequently, a pattern corresponding to a locus due to the movement of the light pen on the screen can be inputted as its information.</p> |
