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Sensing device and method of sensing a light by using the same

  • US 8,891,031 B2
  • Filed: 04/02/2010
  • Issued: 11/18/2014
  • Est. Priority Date: 07/27/2009
  • Status: Active Grant
First Claim
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1. A sensing device comprising:

  • a lower panel;

    an upper panel facing the lower panel; and

    a liquid crystal layer disposed between the lower panel and the upper panel, the upper panel including an upper substrate having a first surface facing a direction where an object to be sensed would be positioned and an opposite surface facing the liquid crystal layer, both the first surface and the opposite surface being planarized;

    a plurality of infrared ray sensors formed in the upper panel on the opposite surface, each infrared ray sensor including a visible ray blocking film contacting the opposite surface, an insulating layer covering and contacting the visible ray blocking film, an active layer disposed on and contacting the insulating layer, a source and drain electrode, each contacting the active layer, the insulating layer and the opposite surface, a gate insulating layer disposed on the active layer and the source and drain electrodes and contacting the opposite surface, and a gate electrode disposed under the active layer and gate insulating layer; and

    a plurality of visible ray sensors formed in the upper panel on the opposite surface,wherein the active layer includes a material capable of sensing both visible rays and infrared rays, and the material includes at least one of amorphous germanium and micro-crystalline silicon.

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