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Integrated light sensor for an active matrix liquid crystal display panel

  • US 5,831,693 A
  • Filed: 02/22/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 02/22/1996
  • Status: Expired due to Term
First Claim
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1. An active matrix liquid crystal display panel comprising:

  • a) a matrix of predetermined color filters, arranged in a predetermined configuration within a viewing area, deposited on a first substrate;

    b) a first plate of an activating means deposited over the matrix of predetermined color filters, the activating means being a clear conducting material;

    c) a plurality of second plates of the activating means, deposited on a second substrate opposite each color filter, such that when a predetermined second plate is activated, light is permitted to pass through the corresponding filter, the light exiting the first substrate having the color of the corresponding filter;

    d) a plurality of control means, each control means corresponding to each of the second plates of the activating means, for selecting a predetermined second plate in response to control signals;

    e) a liquid crystal material filled in a space between the first and second substrate;

    f) at least one photodiode deposited on the second substrate outside the viewing area, the photodiode sensing ambient lighting conditions around the exterior of the first substrate;

    g) a backlight positioned exterior to the second substrate; and

    h) a control circuit, connected to the photodiode and the backlight, generating a voltage proportional to ambient lighting and controlling the intensity of the light outputted from the backlight based on the ambient lighting sensed by the photodiode.

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