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Display driver including grayscale voltage generator having plural resistors in series each having suitable width

A display driver, grayscale voltage technology, applied in the direction of electric solid-state devices, instruments, circuits, etc., can solve the problem of increasing costs

Inactive Publication Date: 2008-09-03
NEC ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

raises the issue of increased costs

Method used

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  • Display driver including grayscale voltage generator having plural resistors in series each having suitable width
  • Display driver including grayscale voltage generator having plural resistors in series each having suitable width
  • Display driver including grayscale voltage generator having plural resistors in series each having suitable width

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Experimental program
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Embodiment Construction

[0018] figure 1 The structure of a TFT type liquid crystal display device 1 according to an embodiment of the present invention is shown.

[0019] The TFT type liquid crystal display device 1 includes a glass substrate 3 and a display unit (liquid crystal panel) 10 .

[0020] The liquid crystal panel 10 includes a plurality of pixels 11 arranged in matrix on a glass substrate 3 . For example, as a plurality of pixels 11 , (m×n) pixels 11 (m and n are each an integer not smaller than 2) are provided on the glass substrate 3 .

[0021] Each of (m×n) pixels 11 includes a thin film transistor (TFT) 12 and a pixel capacitor 15 . The pixel capacitor 15 includes a pixel electrode and a counter electrode facing the pixel electrode. The TFT 12 includes a drain electrode 13 , a source electrode 14 connected to a pixel electrode, and a gate electrode 16 .

[0022] The TFT type liquid crystal display device 1 includes a gate driver 20, a data driver 30, first to mth gate lines G1 to G...

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PUM

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Abstract

A gradation voltage generation circuit includes a plurality of serially-connected grayscale resistors. The grayscale resistors produce a plurality of gradation voltages. Based on correction information, a width of a selected grayscale resistor is changed without changing a length of the resistor. As a result, the width of the resistor is different from that of a non-selected grayscale resistor.

Description

technical field [0001] The invention relates to a display driver and a display device for displaying display data. Background technique [0002] Display devices such as TFT (Thin Film Transistor) type liquid crystal display devices, passive matrix type liquid crystal display devices, electroluminescence (EL) display devices, and plasma display devices have been widely used. Display data is displayed on a display unit (screen) of the display device. [0003] The display unit is driven by a data driver. The data driver has a gradation voltage generating circuit having a resistor string generating a plurality of gradation voltages for displaying display data. [0004] Display devices are required to accommodate various panel properties having different relationships between electrical input and light output. For example, in the case of liquid crystal panels, it is known that the characteristic (V-T curve) of the relationship between input voltage and panel transmittance vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/02H01L21/82G02F1/133G02F1/1362G09G3/36G06F17/50
CPCG09G3/3688G09G3/3696G09G2310/027
Inventor 圆城启裕
Owner NEC ELECTRONICS CORP