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Adhesion type area sensor and display device having adhesion type area sensor

  • US 6,747,638 B2
  • Filed: 01/17/2001
  • Issued: 06/08/2004
  • Est. Priority Date: 01/31/2000
  • Status: Expired due to Fees
First Claim
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1. An adhesion type area sensor comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:

  • the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;

    a source signal line;

    a gate signal line;

    an electric power source supply line for maintaining a constant electric potential;

    a reset gate signal line;

    a sensor gate signal line;

    a sensor output wiring connected to a constant electric current power supply; and

    a sensor electric power source line for maintaining a constant electric potential;

    a gate electrode of the switching TFT is connected to the gate signal line;

    one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;

    one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;

    a source region of the reset TFT is connected to the sensor electric power source line;

    a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;

    a drain region of the buffer TFT is connected to the sensor electric power line;

    one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;

    a gate electrode of the selection TFT is connected to the sensor gate signal line;

    light emitted from the EL element is reflected on a subject and irradiated to the photodiode; and

    an image signal generated from the light irradiated to the photodiode is input to the sensor output wiring.

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