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Turning-off delay circuit for video apparatus

A technology for video equipment and shutdown delay, which is used in TVs, electrical components, color TVs, etc., to achieve the effects of low cost, extended service life and simple circuit

Inactive Publication Date: 2005-08-10
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a circuit that can make the kinescope grating gradually shrink when the video equipment is turned off, and eliminate bad phenomena such as bright spots and color spots when the video equipment is turned off.

Method used

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  • Turning-off delay circuit for video apparatus
  • Turning-off delay circuit for video apparatus
  • Turning-off delay circuit for video apparatus

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Embodiment Construction

[0032] In order to further illustrate the implementation of the present invention, the technical solution is described in detail below in conjunction with the accompanying drawings:

[0033] Realize the general scheme of the present invention is: in series amplification resistance adjustment type voltage stabilizer (AVR) input terminal in and output terminal out or get two groups of voltage sources that the source has voltage difference, can make picture tube CRT enter grating gradually after setting up power-off respectively The circuit 1 in the shrinking state and the power-off or row scanning start or pause can make the picture tube CRT enter the cut-off state circuit 2. See [ Figure 6 Example]. Added monostable kinescope CRT filament preheating circuit 2 for cut-off viewing, see Figure 7 or Figure 8 example. The circuit 1 that enters the gradually shrinking state of the white raster when the added picture tube is powered off figure 2 . The added circuit 1 that ca...

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Abstract

Connected between output end of secondary side of power transformer inside video device and cathode of display tube, the time delay circuit includes power supply circuit of output end, followed power supply circuit and voltage comparison circuit. When general power of the video device is turned off or standby state is entered, the power supply circuit of output end and followed power supply circuit are discharged so as to provide reference voltage and comparison voltage for voltage comparison circuit respectively. When comparison voltage is larger than reference voltage, the voltage comparison circuit is turned to on. Current released by followed power supply circuit is provided to cathode of display tube. As discharge is weakened step by step, the display tube enters into shrinking state gradually. Comparing with prior art, the invention prevent unhealthy tendency such as bright spot and color spot on display tube at time of shutting down tube so as prolong service time of tube.

Description

【Technical field】: [0001] The invention mainly relates to a shutdown delay circuit for video equipment. 【Background technique】: [0002] In the prior art, video equipment such as TV sets generally have a power-on / off circuit for eliminating bright spots, and this circuit often adopts a discharge type, a cut-off type, or a discharge-resistance type. Bleeding shutdown has a dazzling flashing band and restarting is not good for ultra-high voltage rectifier diodes. The cut-off type will generate high-voltage static electricity to attract dust, and there is still a shortcoming of "color spots" phobia after shutdown. Although the concept of "gradually shrinking grating" has long been proposed, no manufacturer has been able to perfectly propose and implement this solution. In recent years, all manufacturers have added a bleeder resistor next to the rectification filter circuit of the ultra-high voltage winding of the flyback transformer. Although it can eliminate bad phenomena s...

Claims

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Application Information

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IPC IPC(8): H04N5/63
Inventor 李鸿安杨秀凤戴俊
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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