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Backlight device

The technology of a backlight device and a light-emitting unit, which is applied in the field of voltage backlight devices, can solve the problems of system work efficiency reduction, system temperature rise, power consumption, etc., and achieve the effect of improving overall efficiency, preventing switch temperature from rising, and preventing power consumption

Inactive Publication Date: 2009-05-06
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a lot of energy will be dissipated in the form of heat (the energy loss of the switch is divided into conduction loss and switching loss), which will cause the system temperature to rise and excess power consumption, and the working efficiency of the system will also be reduced.

Method used

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Experimental program
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Embodiment Construction

[0047] FIG. 3A is a structural diagram of a backlight device 300 according to an embodiment of the invention. 3, the backlight device 300 includes a light emitting unit 310, a voltage converter 320, a voltage detection unit 330, a correction unit 340, and a feedback control unit 350. Wherein, the light-emitting unit 310 has a first connection terminal S 1 With the second connection terminal S 2 , Its first connection terminal S 1 The output terminal of the voltage converter 320 is electrically connected, and the second connection terminal S 2 The voltage detection unit 330 is electrically connected.

[0048] Continuing the above, the voltage detection unit 330 is electrically connected to the first connection terminal S 1 With the second connection terminal S 2 In between, it is used to detect the voltage levels of the two connection terminals and generate a measurement voltage VM31 accordingly. The correction unit 340 is electrically connected to the voltage detection unit 330 an...

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Abstract

The present invention relates to a backlight device which comprises a light emitting unit, a voltage converter, a voltage detecting unit, a correcting unit and a feedback control unit, wherein, the light emitting unit is provided with a first connecting end and a second connecting end. The voltage converter converts an input voltage to a rated voltage according to a periodic signal. The voltage detecting unit detects the voltage level between the first connecting end and the second connecting end to generate a measuring voltage. The correcting unit executes gain executes gain correction to the measuring voltage and adjusts the corrected voltage with a scaling for generating a correcting voltage. The feedback control unit outputs a feedback signal according to the correcting voltage. The voltage converter dynamically modifies the periodic signal according to the feedback signal.

Description

Technical field [0001] The present invention relates to a backlight device of a display, and particularly relates to a backlight device that dynamically modifies the voltage driving the light emitting diode. Background technique [0002] For various types of display devices, liquid crystal displays can be regarded as the current mainstream commodity. Because LCD monitors have the advantages of high image quality, low power consumption, thin mass production, low voltage drive, small size, etc., it has a place in the market, such as small portable TVs, video phones, camcorders, and notebooks. Computers, desktop monitors, and LCD TVs all show the importance of LCD monitors. [0003] The liquid crystal display mainly includes a liquid crystal display panel, a backlight module and a frame. Among them, the light source generated by the backlight module is a very important factor that determines the chromaticity and brightness of the liquid crystal display. FIG. 1 is a structural diagra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B37/03F21V23/00G02F1/13357F21Y101/02G02F1/1335
Inventor 林琦修林信彰
Owner CHUNGHWA PICTURE TUBES LTD
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