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LCD device, light modulation circuit and its method

A liquid crystal display and dimming circuit technology, applied in static indicators, lamp circuit layout, optics, etc., can solve the problems of small flexible space, single lamp adjustment, high production cost, etc., to achieve large flexible space and uniform brightness , the effect of occupying a small area

Inactive Publication Date: 2008-08-06
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing current transformer CT used 1 ~CT 7 Because it occupies a large area and cannot be adjusted for a single lamp, not only the production cost is high, but also the use of flexible space is not large

Method used

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  • LCD device, light modulation circuit and its method
  • LCD device, light modulation circuit and its method
  • LCD device, light modulation circuit and its method

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Embodiment Construction

[0043] figure 2 A circuit diagram of a dimming circuit according to a preferred embodiment of the present invention is shown. Please refer to figure 2For example, the dimming circuit 200 can be used to control the light-emitting unit L in the backlight module (backlight module) of a liquid crystal display (not shown). 1 (for example: the brightness of lamp tubes, cold cathode tubes, fluorescent lamps, halogen lamps, etc.), but this does not limit its application to the technical field of the present invention. That is, as long as there is a need to adjust the light-emitting unit L 1 When the brightness is high, although it is not applied to the technical field of the present invention, it still belongs to the protection scope of the present invention.

[0044] The dimming circuit 200 includes a control unit 201 and a variable impedance unit 203 . Wherein, the control unit 201 is used to detect the 1 current i L , and convert it into a detection voltage (that is, a curr...

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Abstract

The present invention discloses a light modulation circuit and a method thereof, which can be applied in a backlight module of a prior liquid crystal display devices to determine a reference current by changing a reference voltage value and a detection resistor value, and a light emitting unit determines the presented brightness according to the reference current, therefore a variable impedance unit increases the impedance of the loop of the light emitting unit to facilitate the load current of the light emitting unit to be decreased to the reference current when the load current of the light emitting unit is greater than the reference current; reversely, the variable impedance unit decreases the impedance of the loop of the light emitting unit to facilitate the load current of the light emitting unit to be increased to the reference current when the load current of the light emitting unit is smaller than the reference current; thereby controlling the load current value to be close to the reference current value so as to present the predetermined brightness of the light emitting unit.

Description

technical field [0001] The invention relates to a dimming circuit and a method for adjusting the brightness of multiple lamps in a backlight module of a liquid crystal display, in particular to a dimming circuit and a method for adjusting the brightness of the lamps in the backlight module of a liquid crystal display. Background technique [0002] In recent years, as the size of the LCD panel (LCD panel) has become larger and larger, the number of lamp tubes (such as: cold cathode tubes) of the surface light source provided by the backlight module of the LCD panel (such as a direct type backlight module) There will be more, and in order to effectively control its production cost and the number of parts, the technology of using multiple lamp tubes in parallel (that is, arranged in parallel with each other) has emerged as the times require. [0003] However, due to the large error in the characteristics of each lamp itself, and the leakage current between each lamp and the bac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G09G3/20G02F1/13357H05B37/02G02F1/1335
Inventor 李文中
Owner INNOLUX CORP
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