Patent ID: 6313813
Filing Date: 2001-11-06
Classification: G09G,H04N

Abstract:
A single horizontal scan range monitor supplied with initial display signals in a digital format from an external source, 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; anda 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 different vertical output resolution selected from a plurality of different 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 scaling circuit that converts the resolution of the initial display signals according to the following table:Input Converted fH(kHz) fV(Hv) Clock (MHz) 640 .times. 480 1400 .times. 960 80 79.9 151.68 720 .times. 400 1400 .times. 800 80 95.1 151.68 800 .times. 600 1400 .times. 600 80 124.8 151.68 1024 .times. 768 1400 .times. 768 80 98.9 151.68 1152 .times. 864 1400 .times. 864 80 88.4 151.68 1280 .times. 1024 1400 .times. 1024 80 75.1 151.68where ""Input"" is the resolution in pixels of the initial display signals, ""Converted"" is the resolution in pixels of the display output signals, ""fH"" is the horizontal frequency of the display output signals in Kilohertz, ""fV(Hz)"" is the vertical sync frequency of the display output signals, and ""Clock"" is a frequency of a data output clock in MHz.