A kind of backlight driving circuit and its driving method and liquid crystal device

A technology of backlight drive circuit and constant current drive chip, which is applied in the direction of electrical components, instruments, static indicators, etc., which can solve the impact of the components of the backlight drive circuit, the power of the backlight drive circuit is too high, and the working life of the backlight drive circuit is reduced And other issues

Active Publication Date: 2016-06-29
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in 3D mode, it often happens that the OCP threshold is not reached, the overcurrent protection function has not been triggered, but the power of the backlight drive circuit is too high, which has a great impact on the components of the backlight drive circuit, reducing the backlight drive circuit. The case of working life

Method used

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  • A kind of backlight driving circuit and its driving method and liquid crystal device
  • A kind of backlight driving circuit and its driving method and liquid crystal device
  • A kind of backlight driving circuit and its driving method and liquid crystal device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as image 3 , 4As shown, the backlight drive circuit disclosed in this embodiment includes a power module and a constant current drive chip 30, the power module includes a first controllable switch Q1, and an adjustable load is connected between the first controllable switch Q1 and the ground terminal of the backlight drive circuit. , the adjustable load includes a switching module that can switch different resistance values, the control end of the switching module is coupled to the mode switching signal of the backlight drive circuit; the end of the adjustable load connected to the first controllable switch Q1 is coupled to the constant current drive chip 30 overcurrent protection port.

[0031] The adjustable load includes a first resistor R1 and a second resistor R2 connected in parallel, the switching module includes a second controllable switch Q2, and the second controllable switch Q2 is connected in series between the second resistor R2 and the ground termi...

Embodiment 2

[0042] Such as Figure 5 As shown, this embodiment discloses a driving method of the backlight driving circuit of the present invention. Include steps:

[0043] A. Determine the display mode of the backlight drive circuit. If it is a 2D display mode, go to step B; if it is a 3D display mode, go to step C;

[0044] B. The mode switching signal controls the switching module to switch to the resistance value corresponding to the 2D overcurrent protection threshold;

[0045] C. The mode switching signal controls the switching module to switch to the resistance value corresponding to the 3D overcurrent protection threshold;

[0046] The adjustable load can adopt the scheme of connecting resistors in parallel, specifically, the adjustable load includes a first resistor and a second resistor connected in parallel, the switching module includes a second controllable switch, and the second controllable switch is connected in series between the second resistor and ground between the ...

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PUM

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Abstract

The invention discloses a backlight driving circuit, a driving method thereof and a liquid crystal device. The backlight drive circuit includes a power module and a constant current drive chip, the power module includes a first controllable switch, an adjustable load is connected between the first controllable switch and the ground terminal of the backlight drive circuit, and the adjustable The load includes a switching module capable of switching different resistance values, the control end of the switching module is coupled to the mode switching signal of the backlight drive circuit; the end of the adjustable load connected to the first controllable switch is coupled to the constant current drive chip The overcurrent protection port. The present invention can provide two OCP thresholds with more settings, and reliable overcurrent protection can be obtained no matter in 2D mode or 3D mode.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and more specifically, relates to a backlight driving circuit, a driving method thereof and a liquid crystal device. Background technique [0002] Usually, the constant current driver chip of the backlight driver circuit will be equipped with an overcurrent protection port (overcurrent protection, hereinafter referred to as OCP) and a corresponding OCP threshold. The circuit is disconnected to protect the circuit, the specific circuit is as figure 1 shown. [0003] The current constant current driver chip of the backlight driver circuit has only one OCP threshold, which is generally set according to the 2D display mode. However, in 3D mode, it often happens that the OCP threshold is not reached, the overcurrent protection function has not been triggered, but the power of the backlight drive circuit is too high, which has a great impact on the components of the backlight drive circuit, redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
CPCG09G3/3426G09G2330/025G09G2330/04H05B45/10H05B45/38Y02B20/30
Inventor 胡安乐张先明
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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