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Light quantity detection circuit and display panel using the same

  • US 20050258341A1
  • Filed: 05/20/2005
  • Published: 11/24/2005
  • Est. Priority Date: 05/21/2004
  • Status: Abandoned Application
First Claim
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1. A light quantity detection circuit comprising:

  • a photosensor comprising a thin film transistor comprising a gate electrode disposed on a substrate, a semiconductor layer disposed on the substrate, an insulating film disposed between the gate electrode and the semiconductor layer, the photosensor converting light incident thereon into an output comprising an electric signal, and the semiconductor layer comprising a channel, a source disposed at one end of the channel and a drain disposed at another end of the channel;

    a first resistor connected with the photosensor in parallel;

    a switching transistor comprising a gate receiving the output of the photosensor and a first and second terminals between which a current runs in response to the output of the photosensor, the first terminal of the switching transistor being connected with a first power terminal and the second terminal of the switching transistor being connected with a second power terminal;

    a second resistor connecting the first terminal of the switching transistor and the first power terminal; and

    an output terminal connected with a wiring connecting the second resistor and the first terminal of the photosensor.

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