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Method and apparatus for generating subfield codes

A technology of subfields and encoding units, applied in the field of generating subfield codes and devices

Inactive Publication Date: 2006-03-22
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, these types of LUTs are also different for each mode employed in the PDP (e.g. 60Hz, 50Hz, 75Hz...), which further increases the need for external memory to 4.5M bits for 3 modes

Method used

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  • Method and apparatus for generating subfield codes
  • Method and apparatus for generating subfield codes
  • Method and apparatus for generating subfield codes

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Embodiment Construction

[0061] figure 2 A circuit arrangement for encoding video levels into subfield codes is shown. A code conversion LUT10 is used to map video levels to luma codes. A transcoding LUT is associated with each APL value and, if necessary, each color component and each display mode. Store these transcoding LUTs in external memory. As previously described, the size of this external memory must be 4.5M bits for 256 video levels with three colors and three display modes. These transcoding LUTs 10 are used by transcoding block 11 to map video levels into luma codes. These luma codes are then mapped into subfield codes by the subfield encoding block 12 .

[0062] According to the present invention, the LUT used to map video levels into luma codes is as follows image 3 Offset LUT shown. In each of these LUTs, offset values ​​are stored for each video level instead of luma codes. This offset value for video level n (called offset(n)) is the difference between the luminance code for ...

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Abstract

The present invention relates to a method and an apparatus for generating subfield codes for pictures displayed on a display device like plasma display panels (PDPs) or display devices wherein the grey level of the pixels of the pictures displayed by the display device is obtained by modulating the number of light pulses per frame or sustain pulses, the number of sustain pulses per subfield of the frame depending on the power average level of the picture to be displayed. The video levels of the pictures are first transcoded into luminance codes and then coded into subfield codes. In order to reduce the memory size required for implementing this transcoding, offset values between luminance codes are stored in a look-up table instead of storing the luminance codes. The luminance codes are then regenerated in the controller of the display device.

Description

technical field [0001] The present invention relates to a method of generating subfield codes for images displayed on one or more display devices such as a plasma display panel (PDP), wherein by modulating the number of light pulses or sustain pulses per frame (pulse Wide modulation PWM) to obtain the gray scale of the pixels of the image displayed by the display device. The invention also relates to a device for carrying out the method. Background technique [0002] The present invention is very useful in the field of plasma display panels (PDP) or other display devices in which each video level is represented by a combination of bits according to an absolute coding method. [0003] Thus, when algorithms for improving image quality are based on data stored in memory, such as look-up tables (LUTs), the size of such tables can be quite large. [0004] The invention will be described for a PDP, but it can also be applied to other types of displays as described above. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/28G09G3/20H01J17/49G09F9/313
CPCG09G2360/16G09G3/2007G09G2320/0626G09G3/28G09G3/2092G09G3/2022G09G3/20G09G3/296
Inventor 塞巴斯蒂恩·韦特布鲁克卡洛斯·科雷亚锡德里克·特鲍尔特
Owner THOMSON LICENSING SA