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Data driver

A technology of data driver and grayscale voltage, which is applied to instruments, static indicators, etc., and can solve the problem that it is difficult to reduce the breakdown voltage of protective components

Inactive Publication Date: 2011-04-13
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In the second conventional example, it is difficult to reduce the breakdown voltage of the protection element

Method used

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Experimental program
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Embodiment Construction

[0043] Hereinafter, a liquid crystal display device using a data driver according to the present invention will be described in detail with reference to the accompanying drawings.

[0044] Figure 6 is a block diagram showing the configuration of the liquid crystal display device 1 to which the data driver 7 is applied according to the present invention.

[0045] A liquid crystal display device 1 includes a liquid crystal display panel 2 having a plurality of pixels 5 arranged in a matrix. In the liquid crystal display panel 2, a plurality of data lines 3 and a plurality of scan lines 4 are formed to intersect each other, and pixels 5 are provided at respective intersection points. The pixel 5 has a TFT (Thin Film Transistor), a liquid crystal, and a common electrode. The gate of the TFT is connected to the scan line 4 , and the source or drain of the TFT is connected to the data line 3 . One end of the pixel capacitance including liquid crystal is connected to a source or ...

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PUM

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Abstract

A data driver includes a gray scale voltage generating circuit including resistance elements connected in series, and configured to generate a plurality of gray scale voltages; a gray scale voltage selecting circuit configured to select a selection gray scale voltage from among the plurality of gray scale voltages based on a digital signal. The gray scale voltage selecting circuit includes selecting circuits provided with MOS transistors for groups of resistance elements; an ESD (Electro-Static Discharge) protection circuit including P-type protection elements connected between a node for a first power supply voltage VDD and the plurality of nodes, and N-type protection elements connected between a node for a second power supply node to which a second power supply voltage VSS and the plurality of nodes; and a dummy gray scale voltage selecting circuit including a plurality of dummy selecting circuits which includes dummy circuit MOS transistors which are connected between the gray scale voltage generating circuit and the gray scale voltage selecting circuit. The plurality of dummy selecting circuits are always turned on to function as resistances.

Description

technical field [0001] The invention relates to a data driver applied to a liquid crystal display. Background technique [0002] figure 1 is a circuit diagram showing the configuration of the data driver described in Patent Document 1 as the first conventional data driver. Patent Document 1 corresponds to US Patent Application No. 11 / 554,347. Its entire content is hereby incorporated by reference. [0003] The first conventional data driver includes a grayscale voltage generation circuit 11 and a grayscale voltage selection circuit 12 . [0004] The gradation voltage generating circuit 11 generates 2 n (n is an integer of 2 or more) grayscale voltages V0 to V(2 n -1) and supply them to the grayscale voltage selection circuit 12. The grayscale voltage selection circuit 12 receives n digital data signals D1 to Dn and grayscale voltages V0 to V(2 n -1). The gray-scale voltage selection circuit 12 selects the gray-scale voltages V0 to V(2 n One of -1) is used as a data ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133
CPCG09G3/3696G09G3/3685G09G2330/04
Inventor 幸信行鹤田淳二
Owner RENESAS ELECTRONICS CORP