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Back light module, liquid crystal display and color temperature control method

A backlight module and color temperature technology, applied in static indicators, cathode ray tube indicators, optics, etc., can solve problems such as lowering product production efficiency, difficult color sensor gain correction, and inconsistent color sensor characteristics

Active Publication Date: 2012-03-21
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, manually adjusting the gain value of the photoelectric conversion unit is not only prone to product yield problems, but also will reduce the production efficiency of the product
In addition, since the luminance of light emitted by each light emitting diode is different and the characteristics of each color sensor are also inconsistent, it is difficult to correctly perform gain correction of the color sensor

Method used

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  • Back light module, liquid crystal display and color temperature control method
  • Back light module, liquid crystal display and color temperature control method
  • Back light module, liquid crystal display and color temperature control method

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Embodiment Construction

[0060] Please also refer to Figure 4 and Figure 5 , Figure 4 shows a schematic diagram of a liquid crystal display, while Figure 5 A schematic diagram showing a backlight module according to a preferred embodiment of the present invention. The liquid crystal display 5 includes a display panel 52 and a backlight module 50 , the backlight module 50 is used to provide light to the display panel 52 .

[0061] The backlight module 50 includes a photoelectric conversion unit 60 , a color temperature controller 70 , an LED module 80 and a pulse width modulation switch 90 . The LED module 80 includes a driver 810 and a LED 820 . The photoelectric conversion unit 60 senses the luminance of the LED 820 and outputs a voltage level S1 to the analog-to-digital converter 710 of the color temperature controller 70 according to the luminance. The color temperature controller 70 is, for example, a microcontroller.

[0062] The analog-to-digital converter 710 converts the voltage level...

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Abstract

The invention relates to a backlight module, a liquid crystal display, and a color temperature control method. The backlight module comprises a light emitting diode module, a pulse width modulation switch, a photoelectric conversion unit, and a color temperature controller. The photoelectric conversion unit is coupled with the pulse width modulation switch, and the pulse width modulation switch is controlled by pulse width modulation signals. The photoelectric conversion unit is used for sensing the brightness of the light emitted from the light emitting diode module, and outputting voltage levels according to the light brightness and the pulse width modulation signals. The color temperature controller is used for outputting control signals to the light emitting diode module according to the voltage levels so as to adjust the light brightness.

Description

technical field [0001] The invention relates to a backlight module, a liquid crystal display and a color temperature control method, and in particular to a backlight module with automatic gain correction, a liquid crystal display and a color temperature control method. Background technique [0002] Since light emitting diodes (Light Emitting Diodes, LEDs) have the characteristics of no mercury and high color saturation, more and more backlight modules use light emitting diodes as backlight sources. In order to avoid the chromaticity shift of the backlight module caused by the temperature change and life decay of the LEDs, the photoelectric conversion unit is generally used to sense the luminance of the red, green, and blue LEDs for closed-loop control of the color temperature. . [0003] Please refer to figure 1 , which shows a schematic diagram of a conventional backlight module. The traditional backlight module 10 includes a photoelectric conversion unit 20 , a color te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36G09G5/02G09G5/10G01J3/46G02F1/13357G02F1/133
Inventor 李永龙陈世明
Owner INNOLUX CORP