Patents Represented by Law Firm Oblon, Spivak, MccClelland, Maier & Neustadt
  • Liquid crystal matrix control employing doped semiconductor pixel electrode surrounded by undoped channel region
    Patent number: 5337172
    Abstract: A matrix display device using electro-optical material, wherein the material is inserted between two substrates, each comprising an array of electrodes. One of these arrays comprises transparent doped semiconductor zones acting as pixel electrodes surrounded by zones with little or no doping, constituting the channel of a control transistor, the electrode of which forms the source or the drain. The gate electrode may be formed as a ladder shaped structure over the channel in which the areas between the rungs are pixel electrodes.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: August 9, 1994
    Assignee: Thomson-CSF
    Inventor: Jean-Claude Lehureau