Single horizontal scan range CRT monitor

  • US 6,816,131 B2
  • Filed: 06/13/2001
  • Issued: 11/09/2004
  • Est. Priority Date: 10/21/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A single horizontal scan range monitor supplied with initial display signals in a digital format from a computer, the initial display signals having one of a plurality of input resolutions and comprising:

  • a cathode ray tube (CRT) display having a single horizontal scanning frequency;

    a receiver for receiving the initial display signals transmitted from the computer, the initial display signals transmitted in digital format;

    a converter supplied with the initial display signals for detecting the input resolution of the initial display signals, converting the initial display signals to digital output signals having a vertical output resolution selected from a plurality of output resolutions matched to the detected input resolution of the initial display signals and the single horizontal scanning frequency of the CRT display and supplying the digital output signals to the CRT display;

    wherein the converter includes a frame memory;

    wherein the initial display signals are written to the frame memory at the initial resolution and the initial horizontal scanning frequency and read out of the frame memory as the digital display output signals at the single horizontal scanning frequency and the vertical output resolution, wherein the frame memory includes a first frame memory and a second frame memory; and

    wherein the controller is configured to, arrange the first frame memory as an input frame memory configured to receive the initial display signals at the initial resolution and at the initial horizontal scanning frequency, arrange the second frame memory as an output frame memory configured to output the digital output signals at the single horizontal scanning frequency, and switch operation of the first and second frame memory after a full input frame has been received by the input frame memory and after afull output frame has been output by the output frame memory.

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