×

Shared memory for split-panel LCD display systems

  • US 5,537,128 A
  • Filed: 08/04/1993
  • Issued: 07/16/1996
  • Est. Priority Date: 08/04/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A display apparatus to display video information on a dual scan flat panel display device, comprising:

  • a single memory array having a display memory area and a frame buffer area;

    a video controller for causing video information to be displayed on the dual scan flat-panel display device, the video controller reading display data from the display memory area, and storing display data into and retrieving display data from the frame buffer area of the single memory array during display of a frame of the video information, the video controller comprising;

    memory cycle arbitration and sequencer for deciding when to retrieve display data from or store display data into said single memory array;

    a flat-panel write cycle FIFO with associated full and empty logic;

    a flat-panel read cycle FIFO with associated full and empty logic for reading display data from the frame buffer; and

    a CRT read cycle FIFO with associated full and empty logic for receiving display data from the display memory area,wherein the flat panel write cycle FIFO, the flat-panel read cycle FIFO and the CRT read cycle FIFO are all operatively connected to the single memory array;

    means responsive to display data read from the display memory area of the single memory array to produce frame-rate modulated, grey-shaded data; and

    formatting means for converting frame-rate modulated, grey-shaded data from a data width of the flat-panel display to a data width of the single memory array, the formatting means also converting the display data in the CRT read cycle FIFO from the data width of the single memory array to the data width of the flat-panel display device;

    wherein said video controller stores through the flat-panel write cycle FIFO into the frame buffer area the display data converted to the data width of the single memory array, and causes to be displayed on the dual scan flat-panel display device the data converted to the data width of the flat-panel device.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×