Patents Represented by Attorney Dirks B. Foster
  • Patent number: 5124818
    Abstract: An LCD display system is formed by stacking two or more independently operated LCD elements. By exploiting the birefringent effect of STN nematic liquid crystals a full range of colors may be displayed. Display rows in the stacked panels are preferably interlaced to achieve high display resolution. Optics are desirably included to collimate light, illuminating the stacked elements, to reduce parallax effects and to disperse light exiting the stacked elements to permit wide angle viewing. The contrast between a pixel in the dark state and in the white state of the high resolution display system may be increased by modifying the .DELTA.nd product of the liquid crystal in the passive regions to compensate for the natural birefringence of the liquid crystal in optically aligned active regions.
    Type: Grant
    Filed: August 24, 1990
    Date of Patent: June 23, 1992
    Assignee: In Focus Systems, Inc.
    Inventors: Arlie R. Conner, Paul E. Gulick