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Backlight module, LCD device and light source drive method

A liquid crystal display device, backlight module technology, applied in optics, nonlinear optics, static indicators, etc., can solve the problems affecting the current accuracy and current balance of light-emitting diodes, noise interference, increased power loss, etc., and achieve good display quality. , Control the switching loss, avoid the effect of flickering phenomenon

Active Publication Date: 2010-02-03
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the frequency of the control signal will increase the switching times of the switch and cause more switching losses, thereby increasing the power loss
At the same time, under high-frequency operation, more noise interference such as electromagnetic interference will be generated
In addition, when the conventional backlight module operates at high frequency, it will also affect the current accuracy and current balance of controlling the light emitting diodes.

Method used

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  • Backlight module, LCD device and light source drive method
  • Backlight module, LCD device and light source drive method
  • Backlight module, LCD device and light source drive method

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Embodiment Construction

[0036] A backlight module, a liquid crystal display device, and a light source driving method according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

[0037] refer to figure 2 as shown, figure 2 It is a schematic diagram of a backlight module 2 in a preferred embodiment of the present invention. The backlight module 2 includes a power conversion unit 21 , a light emitting unit 22 and a frequency modulation control unit 23 . The frequency modulation control unit 23 is electrically connected to the light emitting unit 22 .

[0038] The light emitting unit 22 includes a constant current control circuit 221 and a plurality of light emitting diodes 222 . In this embodiment, the light emitting diodes 222 can be in the form of light bars, and the connection method is, for example, a light bar having a plurality of light emitting diodes c...

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Abstract

A backlight module comprises an illuminating unit and a frequency modulation control unit. The frequency modulation control unit and the illuminating unit are connected electrically; the frequency modulation control unit receives a first control signal, and generates a second control signal at least having a first frequency or a second frequency according to the working cycle so as to control theilluminating unit. The invention also discloses an LCD device and a light source drive method.

Description

technical field [0001] The invention relates to a backlight module, a liquid crystal display device and a light source driving method. Background technique [0002] Generally speaking, a liquid crystal display device includes a backlight module and a liquid crystal display panel. Since the liquid crystal display panel itself does not emit light, the function of the backlight module is to provide sufficient brightness and a uniform light source so that the liquid crystal display panel can display images. [0003] refer to figure 1 As shown, it is a schematic block diagram of a conventional backlight module 1 , which includes a power conversion unit 11 , a plurality of LEDs 12 and a constant current control circuit 13 . Wherein, the power conversion unit 11 is electrically connected to the light emitting diode 12, and the power conversion unit 11 converts the first power signal VS 11 converted into a second supply signal VS 12 Then output to the light emitting diode 12. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G02F1/13357
Inventor 杨政峰吴震乙黄士宾
Owner INNOLUX CORP