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A method and system for realizing soft startup of display device

A display device and soft-start technology, which is applied to the scanning details of TV systems, static indicators, cathode ray tube indicators, etc., can solve the problems of low line excitation pulse frequency and damage to the output tube, achieve soft and smooth conversion, and achieve protection , easy to achieve effect

Inactive Publication Date: 2010-01-20
SHENZHEN TCL NEW-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to provide a method and system for realizing the soft start of CRT display equipment, aiming to solve the problem in the prior art that the line excitation pulse frequency is too low when the CRT display equipment is started and the line output tube is damaged

Method used

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  • A method and system for realizing soft startup of display device
  • A method and system for realizing soft startup of display device
  • A method and system for realizing soft startup of display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment one process of the present invention is as Figure 5 Shown, specifically include the following steps:

[0072] 1. At the moment when the TV is started, the CPU executes the program to disconnect the line frequency excitation pulse signal output by the TDA9116 to the line output tube through a register;

[0073] 2. Assign xo=2304 to the register that determines the line frequency in the frequency conversion IC PW1225, and calculate the line frequency according to the following formula:

[0074] fo=K×xo

[0075] =20.94×2304

[0076] = 48kHz

[0077] 3. The CPU executes the program to turn on the horizontal excitation pulse output of TDA9116, and provides the horizontal frequency excitation pulse of 48kHz to the horizontal output tube to reduce the current and voltage that the horizontal output tube bears.

[0078] 4. The frequency conversion ICPW1225 outputs a 48kHz signal for a certain period of time;

[0079] The 48kHz horizontal frequency excitation pul...

Embodiment 2

[0092] The flow of this embodiment is as follows Image 6 As shown, the scanning IC (such as TDA8380) used has its own power supply detection function, and the scanning IC provides the detection result in a flag register, and its status is 1, indicating that the power supply is up to standard. Therefore, the program can read the state of the register to judge whether the precondition of the transition is full, and when it is 1, execute the transition.

[0093] In this embodiment, except that step 5 is different from that in embodiment 1, other steps are basically the same as in embodiment 1, and this will not be repeated here. The description of step 5 is as follows:

[0094] 5. Scan the IC to check whether the power supply reaches the normal value, if yes, go to step 6, otherwise go to step 4.

[0095] In order to further understand the effect of the present invention, a quantitative concept is given below through specific calculations to see how much difference there is bet...

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PUM

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Abstract

The invention provides a method for realizing equipment soft start and a system. Said method includes steps as follows: a. line frequency energizing impulse inputted into line output pipe by wipe circuit is cut off firstly when display equipment start, converter circuit inputs line frequency energizing impulse into wipe circuit, its frequency is higher or equal to lowest line scanning frequency of display equipment in normal working, said wipe circuit outputs said line frequency energizing impulse into line output pipe of said display equipment; b. said converter circuit outputs line frequency energizing impulse of normal line scanning frequency into said wipe circuit when control electrical source of automatic frequency control AFC circuit and frequency dividing circuit of said display equipment scanning part reaching stabile working state.

Description

technical field [0001] The invention relates to the technical field of video display, in particular to the soft start of a CRT display device. Background technique [0002] CRT (cathode ray tube) display equipment mainly includes CRT TV and CRT monitor, which is an electron beam scanning device that realizes electro-optic conversion and reproduces images. [0003] figure 1 It is a schematic circuit diagram of the line scanning part of the CRT display device, where Q is the line output tube, D is the damping diode, C is the return capacitance, Lt is the linear correction inductance, Lh is the inductance of the deflection coil in the line direction, and Cs is the S correction Capacitor, FBT is a line flyback transformer. [0004] figure 2 for figure 1 The equivalent circuit diagram of , in which, the line output tube and damping diode is simplified as a switch, because Lt<<Lh, so Lt can be simplified as a short circuit, that is, its influence is ignored. And becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G1/04H04N3/16
Inventor 刘树标
Owner SHENZHEN TCL NEW-TECH CO LTD