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Method and circuit for realizing LCD TV VGA arousing function

A technology of liquid crystal TV and its implementation method, which is applied to the parts of color TV, the parts of TV system, TV, etc., and can solve the problem that the main chip MCU cannot enter the state of standby and dormant low power consumption, increase the system standby power consumption, and consume the system Resources and other issues, to achieve the effect of reducing standby power consumption, simple implementation, and saving system resources

Active Publication Date: 2008-03-26
KONKA GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the existing VGA wake-up function is realized when the main chip MCU continuously detects the line and field synchronization of the VGA signal in the system standby state, this requires that the ADC power supply of the chip cannot be powered off when the display is in standby, which increases the standby function of the system. While the program is running, it continuously accesses the row-field synchronization registers, causing the main chip MCU to fail to enter the low-power consumption state of standby and dormancy, which consumes a certain amount of system resources.

Method used

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  • Method and circuit for realizing LCD TV VGA arousing function
  • Method and circuit for realizing LCD TV VGA arousing function

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Embodiment Construction

[0011] The invention cleverly uses the characteristic that the voltage of pin 9 of the VGA terminal changes from low to high when there is a VGA output, and adopts a simple and mature peripheral circuit, as shown in Figure (2). Among them, XS1 is the VGA interface; Detect is one of the I / O ports of the main IC; VCC is the power supply network; when there is a VGA signal output, the level of the 9-pin A point of the VGA terminal will change from low (0V) to high (5V) ), at the moment of the level transition, C1 starts to be charged, the transistor V1 is cut off, the transistor V2 is turned on, and the level of point B is pulled down; after C1 is charged, the base voltage of the transistor V1 is high, V1 is turned on, and the transistor is turned on. When V2 is turned off, the level of point B returns to high; in this way, point B forms a low-level pulse. Once the low-level pulse is detected by the I / O port Detect, the VGA function of the system will be immediately awakened. The pul...

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Abstract

A method for realzing VGA arousing function of liquid crystal television and a circuit thereof, wherein the method comprises: according to characteristics of VGA terminal nine-pin voltage changing from low to high when a VGA is output, adopting an external circuit, generating a low electric level pulse with adjustable pulse width at will, a main chip I / O can arouse VGA of a liquid crystal television and a display through detecting the low electric level pulse; the circuit comprises XS1 which is used as a VGA interface, one I / O interface which uses Detect as the main IC, using VCC as a power source; when a VGA signal is output, 9 pin A point electric level nine-pin A point electrical level of the VGA termial is changed from low (0V) to high (5V), a low electric level pulse is formed through the circuit B point, once the low electric level pulse is detected by the I / O interface Detect, the VGA function of the system is aroused. The detecting pin Detect does not occupy a new I / O interface of the main chip through multiplexed key input port key; the method does not need the main chip reading registers and detecting VGA line-field synchronously, does not need ADC power supply, which uses characteristics of VGA terminal nine-pin voltage changing from low to high when a VGA is output to realize VGA arousing function of liquid crystal televisions and display products.

Description

Technical field [0001] The invention relates to a wake-up method of a liquid crystal television, in particular to a method for realizing a VGA wake-up function when a liquid crystal display device is used as a display, and a VGA wake-up circuit. Background technique [0002] The VGA wake-up function of existing LCD TVs and display products is often implemented in the following ways: As shown in Figure 1, ADC POWER is the main chip's ADC power supply, register 1 accesses the VGA's line synchronization signal (VGA_HSYNC), and register 2. Access the vertical sync signal (VGA_VSYNC) of the VGA. When the system is in standby, the main chip MCU reads the line and field register status in each main cycle program cycle and judges the line and field synchronization signal through a complex software algorithm. Once the VGA line and field synchronization signal is detected, it immediately wakes up the VGA function of the display. Since the existing VGA wake-up function is implemented in the...

Claims

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Application Information

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IPC IPC(8): H04N5/63G09G5/00G06F3/14
Inventor 孔令枝黄运汉周波汪繁
Owner KONKA GROUP
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