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Display device comprising a cathode ray tube

A technology of display equipment and electron beams, applied in the direction of color signal processing circuits, etc., can solve the problems of poor frequency response of video amplifiers, increased capacitive load of video amplifiers, expensive transistors, etc.

Inactive Publication Date: 2006-03-01
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the disadvantage is that these transistors are expensive and add capacitive load to the video amplifier, thereby degrading the frequency response of the video amplifier

Method used

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  • Display device comprising a cathode ray tube
  • Display device comprising a cathode ray tube
  • Display device comprising a cathode ray tube

Examples

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Embodiment Construction

[0019] Such as figure 1 The shown display device has a cathode ray tube T, a video amplifier VA, a video processing circuit VP, a high voltage generator H, and a detection circuit S. The tube T has an electron gun (G) for generating at least one electron beam. The cathode ray tube T may be a monochrome tube whose electron gun G has one cathode or a color tube whose electron gun G has three cathodes G. exist figure 1 , a tube T is shown having a gun (G) comprising three cathodes CR, CG, CB for generating three electron beams corresponding eg to the colors red, green and blue. Tube T also has an internal high voltage capacitor C formed by a conductive layer at the inside of the tube connected to the anode AN of tube T and an outer conductive layer AD at the outside of the tube opposite the inner conductive layer. The video amplifier VA comprises three amplifier stages AR, AG, AB which receive corresponding color components VoR, VoG, VoB of the video signal Vo. The respective...

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PUM

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Abstract

The display device has a cathode ray tube (T), which has an electron gun (G) for generating an electron beam and an outer conductive layer (AD). A video processing circuitry (VP) provides a video signal (Vo) having a black level (BLR, BLG, BLB) to a video amplifier (VA) for modulating the electron beam. The video processing circuitry (VP) has black level controlling circuitry (BL) for controlling the black level (BLR, BLG, BLB) of the video signal (Vo). A sensing circuit (S) senses a black current level of the electron beam corresponding to the black level of the video signal (Vo) and feeds back information about the black current level to the black level controlling circuitry (BL) for stabilizing the black current level. The sensing circuit (S) is coupled to a node (X) to which the outer conductive layer (AD) and one of the output terminals of a high-tension generator (H) are coupled.

Description

technical field [0001] The invention relates to a display device, comprising: [0002] - a cathode ray tube having an electron gun for generating at least one electron beam and an outer conductive layer; [0003] - a video amplifier for modulating the at least one electron beam; [0004] - a video processing circuit for providing a video signal with a black level to the video amplifier, the video processing circuit including a black level control circuit for controlling the black level of the video signal; [0005] - a high-tension generator having an output; and [0006] - detection circuitry for detecting the black current level of at least one electron beam corresponding to the black level of the video signal and for feeding back information relating to the black current level to the black level control circuit for stabilization black current level. Background technique [0007] An embodiment of such a device is known from US 2002 / 0130965. The known device comprises ...

Claims

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Application Information

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IPC IPC(8): H04N9/72
CPCH04N9/72
Inventor J·布哈特C·H·吴
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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