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Display device and liquid crystal screen backlight sequential control circuit thereof

A technology of timing control circuit and backlight control, applied in electrical program control, program control in sequence/logic controllers, etc., can solve problems such as screen flicker and affect user experience, so as to improve user experience and reduce screen flicker. effect of the phenomenon

Active Publication Date: 2017-10-17
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing backlight timing control circuit 70a is prone to screen flicker, which affects user experience, and it is necessary to improve it

Method used

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  • Display device and liquid crystal screen backlight sequential control circuit thereof
  • Display device and liquid crystal screen backlight sequential control circuit thereof
  • Display device and liquid crystal screen backlight sequential control circuit thereof

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Experimental program
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Embodiment Construction

[0017] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0018] combine figure 1 and figure 2 , firstly, a more detailed analysis is carried out on the processes of the existing backlight timing control circuit 70a in the process of AC shutdown and DC shutdown.

[0019] Since the power supply (12V) of the liquid crystal screen 50 is directly received from the power module 10 through the line 105, the power module 10 is usually connected with a large electrolytic capacitor, and the discharge time is very slow, while there is no or very little electrolytic capacitor on the main board 30. Therefore, the discharge is faster. Therefore, when the AC power is cut off, the motherboard 30 is powered off earlier than the LCD screen 50, so that the motherboard 30 cannot effectively control the backlight of the LCD screen 50, resulting in screen flickering on the LCD screen 50.

[0020] For the AC shutdown process, 1. When the AC sh...

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PUM

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Abstract

The invention relates to a display device and a liquid crystal screen backlight sequential control circuit thereof. The liquid crystal screen backlight sequential control circuit comprises a backlight control unit for generating a backlight control signal based on a signal from a first control port of a master chip and transmitting the signal to a liquid crystal screen through an output port, a follow current unit for providing follow currents for the backlight control unit, and a follow current control unit for controlling the follow current unit to determine whether follow currents are provided based on a signal from a second control port of the master chip. A first power source is connected with the first control port in a pull up manner; and a second power source is connected with the output port in a pull up manner. The follow current unit employs a follow current power supply for power supply; the power-down time of the follow current power supply is larger than the power-down time of the first power source; and the power-down time of the follow current power supply is larger than the power-down time of the second power source. Therefore, the splash occurrence is reduced; and the user experience is improved.

Description

technical field [0001] The invention relates to a display device, in particular to backlight control of a liquid crystal screen. Background technique [0002] see figure 1 , current display devices such as LCD TV 100a and the like usually include: a power supply module 10; a main board 30, the main board 30 includes a main chip, etc.; and the backlight timing control circuit 70a, controlled by the control port 307a of the motherboard 30, generates a backlight control signal 705a. In addition, the LCD screen 50 obtains relevant power supply from the power module 10 through the line 105 . [0003] see figure 2 , the backlight timing control circuit 70a uses a single standby controllable GPIO to provide the BL_CTL control signal, plus a complex freewheeling circuit (that is, the circuit part on the emitter side of the triode V1), because the freewheeling circuit has a capacity capacitor C1 , C2 and diodes VD1, VD2 require a larger PCB (printed circuit board) area to place ...

Claims

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Application Information

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IPC IPC(8): G05B19/04
Inventor 田收
Owner HISENSE VISUAL TECH CO LTD
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