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Apparatus and method for realizing gray levels of LCD device

一种液晶显示装置、灰度的技术，应用在静态指示器、仪器等方向，能够解决无法伽马电压实现多种灰度等问题

Active Publication Date: 2006-05-17
HYDIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the existing grayscale realization device realizes a high grayscale level of 1024 grayscales (10 bits) or above, various grayscales cannot be realized by a gamma voltage of a small level.

Method used

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  • Apparatus and method for realizing gray levels of LCD device
  • Apparatus and method for realizing gray levels of LCD device
  • Apparatus and method for realizing gray levels of LCD device

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Embodiment Construction

[0022] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0023] figure 2 A diagram for explaining the driving principle of the present invention is shown.

[0024] A storage capacitor (Cst) and a liquid crystal capacitor (Clc) included in a liquid crystal cell of an LCD pixel are connected to a current source (Icon) to supply charges (Q). Here, the driving current of the pixel is "Icon", and if the charging period is "ton", the total amount of electric charge loaded into the pixel is as shown in the following formula (1).

[0025] Q (Clc+Cst) =Icon*ton...(1)

[0026] The pixel voltage is obtained by the following formulas (2) and (3).

[0027] Vlc=Q (Clc+Cst) / Clc+Cst...(2)

[0028] Vlc=[Icon / (Clc+Cst)]*ton...(3)

[0029] Given the values ​​of the current source (Icon), the liquid crystal capacitor (Clc), and the storage capacitor (Cst), it can be seen from formula (3) that the voltage of the liquid crystal ...

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Abstract

The present invention provides a gradation realization device and method for supplying a constant current instead of a voltage to a pixel, and dividing the charging period from when the gate is turned on / off to input data with a gradation expression number, and expressing a gradation. . The present invention includes: a current supply part, which supplies current for charging pixels; a buffer, which latches display data; an adder, which adds the currently input display data to the display data latched in the memory buffer; a generation part receiving the output data of the adder, and transmitting an on pulse having a pulse width corresponding to the value of the output data to the current supply part; and a control part for controlling the current supply part, adder and pulse generator.

Description

technical field [0001] The present invention relates to a grayscale realization device and method, and particularly relates to supplying a constant current instead of a voltage to a pixel, and time-sharing the charging period for which data is input until the gate is turned on / off by using the number of grayscale expressions, and expressing the grayscale The grayscale realization device and method. Background technique [0002] Generally, in a liquid crystal display device, a plurality of pixels are arranged in a matrix structure between a plurality of data lines and a plurality of scan lines, the positive electrodes of the pixels are connected to the data lines, and the negative electrodes of the pixels are connected to the scan lines, forming a display panel. In the above-mentioned liquid crystal display device, when the potential difference between the data line and the scanning line exceeds the threshold voltage, the pixel emits light, and the brightness is changed accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG09G3/2081G09G3/3688G09G2310/027G09G2310/0272G09G2320/0276G09G3/36
Inventor 殷新社金炯旲
Owner HYDIS TECH CO LTD
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