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Apparatus and method for control of grey scale of display board

A display panel, grayscale technology, applied in the direction of static indicators, parts of color TV, parts of TV systems, etc.

Inactive Publication Date: 2004-05-26
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general trend is that efforts to form small-sized pixels have progressed, and there are still some limitations in reducing leakage current

Method used

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  • Apparatus and method for control of grey scale of display board
  • Apparatus and method for control of grey scale of display board
  • Apparatus and method for control of grey scale of display board

Examples

Experimental program
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Embodiment Construction

[0023] Preferred embodiments of the active driving circuit of the display panel according to the present invention will be described in detail below with reference to the accompanying drawings.

[0024] figure 1 is a block diagram showing an apparatus for controlling gray levels of a display panel according to the present invention.

[0025] see figure 1 , the device for controlling the gray scale of the display panel according to the present invention includes: a pulse modulation section 30 for pulse width modulating some bits of data corresponding to the gray scale of the display panel input from the outside, and pulse width modulating the remaining bits , to apply it to the data line; the switch section 10, for switching the pulse modulation data on the data line according to the scan line signal; and the driving section 20, for controlling the gradation of the display panel corresponding to the data applied from the switch section 10 class.

[0026] The following will r...

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PUM

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Abstract

An apparatus and method for controlling a gray level for a display panel driven by a plurality of scan line signals and a plurality of data line signals is characterized in that some bits of the respective data are pulse amplitude modulated and the other bits are pulse width modulated (PWM) so as to control the gray level for the display panel.

Description

technical field [0001] The present invention relates to a device and a method for controlling gray levels of a display panel. Background technique [0002] With the recent trend of large-scale display devices, there is an increasing demand for flat display panels that occupy a small space. As an example of a flat display panel, an organic EL display panel is receiving more attention. Organic EL display panels are very thin and can be fabricated in a matrix arrangement. Also, the organic EL display panel can be driven at a low voltage of 15V or less. [0003] Recently, an active driving method is mainly used for organic EL display panels. That is, in the active driving method, charge is stored in a capacitor using a low current, and one drive transistor is driven using the charge of the capacitor. [0004] In the active driving method, the gray scale of the display panel is controlled by controlling the range of driving current. However, since the driving current is in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/32
CPCG09G2300/0842G09G2320/0214G09G2300/0809G09G3/2081G09G3/2018G09G3/3233G09G3/2011G09G2330/04G02F1/133
Inventor 金学洙
Owner LG DISPLAY CO LTD
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