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Video display with emission control

A technology for video display and control signals, applied in the field of generated devices, which can solve problems such as unintentional transmission

Inactive Publication Date: 2005-03-23
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such wide bandwidth signals, while necessary to provide the desired level of enhanced performance, may unfortunately and inherently result in unintentional emissions having levels greater than those specified by the FCC

Method used

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  • Video display with emission control
  • Video display with emission control
  • Video display with emission control

Examples

Experimental program
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Embodiment Construction

[0013] Fig. 1A is a block diagram showing part of an image display apparatus using three cathode ray tubes installed in a projection television and incorporating the apparatus of the present invention for detecting and controlling unwanted emissions. Although FIG. 1A shows three CRTs (cathode ray tubes), the problems and inventive solutions to be explained are equally applicable to a display device having a single CRT. Video component signals representing, for example, luminance and color difference signals Y, U, and V are applied to video processor block 50 from a source (not shown), such as a baseband input line, a demodulator output, or a multiplex Multiplexing the decoder. Video processor block 50 may provide a number of video signal processing functions. As mentioned above, for example, video processor block 50 converts video signals Y, U and V into component signals r, g and b that are ultimately coupled to cathode ray tube 100 for display. The multi-processing functio...

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Abstract

The invention relates to a spectrum content responding to a display signal for controlling the unintentional emission. The video display device of the invention comprises: a cathode ray tube (100) for video display; an amplifier with controllable magnification for amplifying the video display signal (Y) of the cathode ray tube (100); a processor (SHRP) connected to the amplifier for strengthening the resolution of the video display signal (Y) according to a first control signal determined by users; an emission analysis block (20) connected to the processor (SHRP) for responding to the frequency component of the video display signal (Y) and producing a second control signal (Ve and Ved). The second control signal (Ve and Ved) is coupled to the processor (SHRP) to reduce the resolution enhancing quantity according to a first scope of the second control signal (Ve and Ved), and the second control signal (Ve and Ved) is coupled to the amplifier to reduce amplification percent according to the second control signal (Ve and Ved).

Description

[0001] This application is a divisional application of the invention patent application with the application number 00133988.5, the application date being November 6, 2000, and the invention title being "Video Display with Emission Control". technical field [0002] This invention relates generally to the field of video displays, and more particularly to devices for use therein to detect and control the generation of unwanted emissions. Background technique [0003] It is well known that electronic circuits comprising image display devices can exhibit electronic characteristics that generate unwanted signal components that can degrade the quality of displayed images or audio output signals. Many methods are known to linearize circuit operation or reduce harmonic generation to prevent impairment of the audio or video performance of the device. These efforts, however, have been focused on avoiding degradation of display performance with little or no consideration for harmful o...

Claims

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Application Information

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IPC IPC(8): H04N5/66G09G1/00H04N1/00H04N3/16H04N3/20H04N3/32H04N5/205H04N5/208H04N5/59H04N5/68H04N9/31H04N9/68
CPCH04N3/32H04N3/20H04N9/68H04N5/205H04N5/59H04N1/00281H04N9/31H04N5/68H04N5/208H04N3/16
Inventor 杰弗里·O·艾伦德达尔·F·格里彭特罗格布赖恩·J·科罗马蒂
Owner INTERDIGITAL CE PATENT HLDG