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Method and device for reinforcing grey scale of display device

A technology for display equipment and control devices, which can be applied to static indicators, components of color TVs, components of TV systems, etc., and can solve problems such as quality problems in quantification steps.

Inactive Publication Date: 2004-02-25
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Especially in the darker areas of the image, there are quality issues due to larger quantization steps

Method used

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  • Method and device for reinforcing grey scale of display device
  • Method and device for reinforcing grey scale of display device
  • Method and device for reinforcing grey scale of display device

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Embodiment Construction

[0032] A PDP address write operation can be seen as a discharge occurring in the selected cell, which will keep the remaining charge in the cell for a certain time (capacitive effect of the plasma cell). During the following hold operation, only the cells that processed the charge will emit light. The hold operation itself is an operation with alternating current, so that at the end of the hold period, the same charge is still present in the cell. In order to reinitialize the cell, a mass delete operation following a hold operation suppresses the charge within the cell.

[0033]Since addressing (writing) can be considered as a discharge occurring only in selected cells, such an operation will also produce some light emission (approximately 0.14cd / m 2 ), the light emission ratio of a single excitation (priming) operation (eg 0.08cd / m 2 ) is much larger. The delete operation can then be applied directly after the write operation. In this case, since no hold period is applied...

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PUM

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Abstract

A method and an apparatus for displaying pictures with an improved grey scale portrayal shall be provided. Therefore, the quantization steps of the digitized signals for a plasma panel display have to be reduced. To achieve such reduction of quantization steps of the light output of a cell of the plasma display panel, the energy of the addressing impulse for addressing those luminous elements which have to be activated for a complete frame period or a part of it is used. Consequently, the light output of the luminous elements can be controlled by the usual sustain impulses and additionally by the addressing impulses thus reducing the quantization steps addressing pulses without subsequent sustain pulses allow finer gradation, especially in dark areas of the pictures.

Description

technical field [0001] The present invention relates to a method and apparatus for enhancing the gray scale of a display device, and more particularly, the present invention relates more closely to a display video processing used to improve display devices such as plasma display panels (PDP) and based The duty cycle modulation (pulse width modulation) principle of light emission is used for the image quality of the picture displayed on all kinds of monitors. In particular, the present invention relates to an apparatus and method for driving a plurality of light-emitting elements with a plurality of light-emitting elements by addressing those light-emitting elements that must be activated for one frame period by applying an address pulse with a predetermined write voltage to each light-emitting element. and controlling the light output of each addressed light-emitting element by applying a discrete, predetermined number of sustain pulses, each of which has the same predetermine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/66G09G3/20G09G3/28G09G3/296
CPCG09G3/296G09G2360/16G09G3/2803G09G2320/0285G09G3/28G09G2320/0276G09G3/2022G09G3/288
Inventor 塞巴斯蒂安·魏德布吕克塞德里克·泰博卡洛斯·科雷亚
Owner THOMSON LICENSING SA
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