Circuit for solving hot doming effect in shadow mask of display device and method therefor
A display device and circuit technology, applied to static indicators, cathode ray tube indicators, instruments, etc., to achieve ultra-low circuit costs, simple circuits, and improved yields
Inactive Publication Date: 2009-07-15
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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[0010] The purpose of the present invention is to provide a circuit and method for solving the phenomenon of thermal arching of the shadow mask of the display device. By adding circuit chips to judge the line and field signals and time in the output image signal, it can effectively prevent thermal arching of the current AK material shadow mask color tube. The problem of color purity drift caused by the phenomenon can ensure the overall brightness of the image and improve the picture quality
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[0031] Various preferred embodiments of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0032] The circuit and method for solving the thermal arching phenomenon of the shadow mask of the display device of the present invention, such as figure 1 with image 3 As shown, its signal input part includes: horizontal synchronous signal, obtained by the horizontal synchronous sampling circuit, which can be sampled from the filament (HEAT) of one of the input terminals of the color tube of the color TV core board, or can be sampled in the decoding circuit on the circuit board Obtained in the first isolation resistor R12, the first transistor Q4, and the first load resistor R11 isolation and conversion into a horizontal synchronous level pulse signal (Hsyn) recognized by the microcontroller IC1, the base of the first transistor Q4 is passed through the The first isolation resistor R12 is connected to the horizontal synchrono...
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The invention provides a circuit and method for solving the thermal arching phenomenon of a shadow mask of a display device. The circuit includes a single-chip microcomputer, a line synchronous sampling circuit, a field synchronous sampling circuit and a brightness Y synthesis circuit; the line synchronous sampling circuit is connected to a color TV The line synchronization signal of the movement; the field synchronization sampling circuit is connected to the field synchronization signal of the color TV movement; the brightness Y synthesis circuit is connected to the R, G, and B output terminals of the color TV movement decoding; the single-chip microcomputer is used to judge the Y brightness Whether the signal level exceeds the set early warning peak level, if it exceeds and lasts for a predetermined time, the single-chip microcomputer is also used to send a control voltage for controlling the beam control circuit (ABL), which is used to urge the color TV core decoding circuit to adjust R, G , B output brightness. Accordingly, the picture quality of the CRT TV set with the AK material shadow mask is effectively improved and guaranteed, and the generation of thermal arching phenomenon is effectively prevented. The present invention is compatible with all current color TV cores.
Description
technical field [0001] The invention relates to a circuit and a method of a CRT television or a display, in particular to a circuit and a method for solving the thermal arch phenomenon of a shadow mask of a display device. Background technique [0002] Although flat-panel technologies such as liquid crystal and plasma have appeared in display devices such as current televisions and monitors, in many industries, CRT display devices are still mainstream products. Due to the lower cost of color picture tubes made of AK materials for shadow masks than those made of Invar, coupled with the current requirements of the meager profit of the color TV industry, in recent years, various color tube suppliers have launched color tubes made of AK material one after another. . [0003] Invar shadow mask is a mature technology, its thermal expansion coefficient is small, and the landing deviation is only 1 / 5 of that of AK steel shadow mask tube, which can effectively solve the problem of p...
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IPC IPC(8): G09G1/28G09G5/02G09G5/10
Inventor 杨军治王勇
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD