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A kind of backlight driving circuit, backlight module and liquid crystal display device

A technology of backlight drive circuit and power module, applied in static indicators, instruments, etc., can solve problems such as damage to key components, achieve circuit safety, reduce peak current value, and avoid peak current effects

Active Publication Date: 2015-11-25
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the inductance used is less than the inductance in the critical working mode due to process deviation, the inductor will work in the current discontinuous mode. Although the effective value of the inductor current is the same, the inductor peak current in the current discontinuous mode is higher than that in the current continuous mode. under the big (such as figure 2 ), so that some key components such as MOS transistor Q1 and diode D1 in the circuit need greater bearing capacity. If the situation is serious, the key components will be damaged

Method used

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  • A kind of backlight driving circuit, backlight module and liquid crystal display device
  • A kind of backlight driving circuit, backlight module and liquid crystal display device
  • A kind of backlight driving circuit, backlight module and liquid crystal display device

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Embodiment Construction

[0020] The invention discloses a liquid crystal display device. The liquid crystal display device includes a liquid crystal panel and a backlight module that provides a light source for the liquid crystal panel. The backlight module includes a backlight drive circuit, the backlight drive circuit includes a power module, an inductor connected to the output end of the power module, and an inductor connected in series LED light bar, a monitoring module for detecting the output current of the inductor is coupled between the inductor and the LED light bar, a controllable switch is connected between the output end of the inductor and the ground end of the backlight drive circuit, and the monitoring The module is coupled with a controllable switch, and when the output current of the inductor is lower than a preset value, the monitoring module controls the controllable switch to be turned on.

[0021] Since the present invention adds a monitoring module to the circuit, when the output...

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Abstract

A backlight drive circuit, comprising: a power source module, an inductor (L1) connected to the output end of the power source module, and an LED light bar connected with the inductor (L1) in series, wherein a monitoring module used for detecting the output current of the inductor is coupled between the inductor (L1) and the LED light bar, a controllable switch (Q1) is connected between the output end of the inductor (L1) and the grounding end of the backlight drive circuit, the monitoring module is coupled to the controllable switch (Q1), and the controllable switch (Q1) is controlled to be conductive by the monitoring module when the output current of the inductor (L1) is lower than a preset value.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and more specifically relates to a backlight driving circuit, a backlight module and a liquid crystal display device. Background technique [0002] A liquid crystal display device includes a liquid crystal panel and a backlight module for providing a light source for the liquid crystal panel. As the cost of LEDs decreases, most existing backlight modules use LEDs as light sources. see figure 1 The backlight module using LED as the light source usually connects multiple LEDs in series to form a light bar, and then uses a boost circuit to drive the light. The inductance L1 of the boost circuit is a very important component. When the LED load is constant, the inductance The size of will determine whether it works in current continuous or current discontinuous mode. When the inductance used is less than the inductance in the critical working mode due to process deviation, the inductor will wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
CPCG09G3/3406G09G2330/028
Inventor 张华杨翔
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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