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Liquid crystal display with image reading function, image reading method and manufacturing method

  • US 6,243,069 B1
  • Filed: 02/18/1999
  • Issued: 06/05/2001
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Term
First Claim
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1. A liquid crystal display device with a function of reading a picture comprising:

  • a plurality of source lines for transferring a picture signal;

    a plurality of gate lines for transferring a scanning signal which are provided in a crossing direction with said source lines;

    a pixel electrode which is provided corresponding to each crossing section of the source lines and the gate lines;

    a first transistor which is connected to the source lines and the gate lines as well as each of the pixel electrodes;

    an opposite electrode which is provided opposite to the pixel electrode;

    a liquid crystal which is provided between the pixel electrode and the opposite electrode; and

    a photo detector for detecting a quantity of a reflected light from an original which is provided corresponding to each of the pixel electrodes;

    fiber comprising;

    a second transistor which is connected to said source lines and said gate lines as well as one end of the photo detector; and

    the other end line which is connected to the other end of the photo detector;

    said liquid crystal display device with a function of reading a picture wherein;

    a threshold value of a gate voltage in said first transistor and a threshold value of a gate voltage in said second transistor are determined so that at least only the second transistor can be made an ON state.

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