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Brightness compensation device and brightness compensation method

A technology of brightness compensation and color brightness, which is applied in the field of compensation devices and can solve problems such as incomplete data, permanent errors, errors, etc.

Inactive Publication Date: 2014-07-09
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When data is written into the non-volatile memory 103, because it takes a long time, if there is a sudden shutdown or external interference, errors or incomplete data will be generated in the non-volatile memory 103, and the wrong data It will be added to the original brightness data, resulting in permanent errors. The result of this in the screen is uneven brightness and color at each point

Method used

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  • Brightness compensation device and brightness compensation method
  • Brightness compensation device and brightness compensation method

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Embodiment Construction

[0025] In a preferred embodiment of the present invention, the non-volatile memory such as flash memory is divided into several areas, and each sector in the area is filled with data error detection codes (such as CRC characters), When reading data, if the calculated error detection code is different from the original stored error detection code, it means that the data in this block is wrong. At this time, the corresponding backup data can be read back to replace the wrong block.

[0026] Such as figure 2 As shown, a checker 201 is further added between the output of the calculation unit 104 and the non-volatile memory 103 such as a flash memory. The old data read / written into the non-volatile memory 103 is judged whether the new data read / written into the non-volatile memory 103 is correct. Further, the checker 201 can be used to check the cumulative value of color brightness output by the calculation unit 104 and the color brightness value stored in the non-volatile memory...

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Abstract

The invention discloses a brightness compensation device and a brightness compensation method. In order to solve the problem that the brightness of a display decays due to ageing, an accumulated value of color brightness of each point can be stored by using a non-volatile memory such as a flash memory, and then the decayed brightness of each point is compensated. However, if a data error occurs or power temporarily fails when data are written into the non-volatile memory, the error exists forever, and the brightness of the display is led to be uneven. Therefore, in the brightness compensation method, a multiple data backup method, a cyclic redundancy check (CRC) error detection method plus an old-new data comparison method are adopted to protect the data of the non-volatile memory, so as to enable the non-volatile memory to provide correct brightness compensation values and enable the brightness of the display to be even.

Description

technical field [0001] The invention relates to a compensation device and method, in particular to a compensation device and a brightness compensation method for display brightness. Background technique [0002] Displays (such as FED fluorescent displays) will dim due to aging after being used for a period of time, and because the lighting time of each color of each point is different, their aging degree will also be different, in order to maintain the brightness and color uniformity of the screen , the brightness must be compensated for the color of each point. [0003] Such as figure 1 As shown in a traditional display system 10, the usage records of these luminance accumulations, that is, the output of the calculation unit 104, are first stored in the relatively fast volatile memory 101 (such as DRAM) of the display system 10, and then sequentially sent to the driver IC102, but once the power is turned off, these records will disappear, so the output of the calculation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G5/10
Inventor 陈宗奎沈俊林刘益成管振廷
Owner HOLTEK SEMICON