Chrominance compensation method and illumination method for display device

A compensation method and a brightness compensation technology, applied in the field of lighting, can solve the problems of inability to detect the chromaticity of the light source and feedback compensation, high power consumption of the backlight, and reduced dynamic contrast.

Inactive Publication Date: 2009-04-15
CPT TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantages of the full-surface lighting LED backlight system are: (1) the larger the panel size, the higher the backlight power consumptio

Method used

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  • Chrominance compensation method and illumination method for display device
  • Chrominance compensation method and illumination method for display device
  • Chrominance compensation method and illumination method for display device

Examples

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no. 1 example

[0031] In the first embodiment of the present invention, a single color sensor is used to perform chromaticity detection and feedback compensation of the light source of the block-controlled backlight system. The block-controlled backlight system can be planned into a plurality of light-emitting blocks, and these light-emitting blocks may include a group of LEDs (including red LEDs, blue LEDs, and green LEDs) or arrays of LEDs.

[0032] FIG. 1 is a diagram showing relative positions of each light-emitting block and a color sensor in a block-controlled backlight system according to a first embodiment of the present invention. As shown in FIG. 1 , the system 10 can be planned into a plurality of light-emitting blocks A01 - A60 . The arrangement of the light-emitting blocks A01 - A60 is shown in FIG. 1 , of course, the present embodiment is not limited to the planning and arrangement of the light-emitting blocks.

[0033] The placement position of the color sensor (CS) 11 is, fo...

no. 2 example

[0065] In the second embodiment of the present invention, a single light sensor (LS) is used to perform chromaticity detection and feedback compensation of the full-surface lighting LED backlight system. FIG. 4 shows a schematic diagram of a full-surface lighting LED backlight system according to a second embodiment of the present invention.

[0066] As shown in FIG. 4 , the system 40 includes a plurality of LED groups C01 - C60 , and each LED group includes 3 LEDs, that is, R / G / B LEDs. This embodiment is not limited to this arrangement. The placement position of the light sensor (LS) 41 is, for example, placed at the central point of the system 40 .

[0067] For detection, all LEDs of a certain color are lit at a time. That is, at the same time, only one color light source will be turned on. For example, all the R LEDs are turned on first, and after the R brightness information is obtained, all the R LEDs are turned off and all the G LEDs are turned on. After obtaining th...

no. 3 example

[0082] In the third embodiment of the present invention, a single light sensor is used to perform light source chromaticity detection and feedback compensation of the block-controlled backlight system. The block-controlled backlight system can be planned into a plurality of light-emitting blocks, and these light-emitting blocks may include a group of LEDs (including red LEDs, blue LEDs and green LEDs) or arrays of LEDs.

[0083] FIG. 6 is a diagram showing relative positions of each light-emitting block and a light sensor in a block-controlled backlight system according to a third embodiment of the present invention. As shown in FIG. 6 , the system 60 can be planned into a plurality of light-emitting blocks E01 - E60 . Of course, this embodiment is not limited to the planning and arrangement of the light-emitting blocks.

[0084] The placement position of the light sensor (LS) 61 is, for example, placed at the central point of the system 60 . It can be seen from FIG. 6 that ...

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Abstract

A block control type backlight system is designed into a plurality of independently controlled light-emitting blocks. Light states of the light-emitting blocks are detected by a single color sensor or a single light sensor. Reference values corresponding to the light-emitting blocks are set according to a white balance value. The reference values and light state information are compared to adjust a tricolored light proportion so as to compensate photochromism and brightness of the light-emitting blocks and an illumination panel. In addition, the states of the light emitted by a plurality of LED modules of a whole face lightening type light source system are detected by the single light sensor. The reference values and the detection results of the light sensor are compared to generate a tricolored light proportion adjustment value so as to compensate the photochromism and the brightness of the light emitted by the LED modules.

Description

technical field [0001] The invention relates to a chromaticity compensation method, a light source driving method and an illumination method of a display device. Background technique [0002] The flat panel display device has become the mainstream of the display device due to its advantages of low radiation dose, lightness and thinness. Flat panel displays use, for example, light-emitting diodes (LEDs) as the backlight for the panel. [0003] At present, a color sensor or a light sensor has been developed for real-time detection and feedback compensation of the brightness or chromaticity of the LED backlight. The color sensor can sense R / G / B three colors of light, while the light sensor can only sense monochromatic light. In terms of cost, the cost of the color sensor is higher than that of the light sensor. [0004] LED backlight systems can be classified into: Whole-panel Based LED Backlight System (Whole-panel Based LED Backlight System); System). In a full-surface L...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G5/02G09G5/10G01J3/46H05B37/02
Inventor 林琦修邱俊杰林信彰
Owner CPT TECH GRP
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