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Display device and its driving method

A technology for a display device and a display part, which is applied to static indicators, instruments, etc., and can solve problems such as the liquid crystal panel 100 not displaying video and the selector working abnormally

Inactive Publication Date: 2012-05-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the source driver 400 that does not satisfy the expression (1), since an overcurrent flows between the terminal of the analog power supply voltage VLS and the ground terminal, the selector does not operate normally, causing a problem that no video is displayed on the liquid crystal panel 100.

Method used

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  • Display device and its driving method
  • Display device and its driving method

Examples

Experimental program
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Embodiment approach

[0154] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0155]

[0156] image 3 It is a block diagram showing the overall configuration of an active matrix liquid crystal display device according to one embodiment of the present invention. The liquid crystal display device has: a liquid crystal panel 100; a display control circuit 200; a switching circuit 250; a gate driver 300; a source driver 400; a reference voltage generating circuit 500; a common electrode driving circuit 600; The display device can perform grayscale display of 256 grayscales. In the above-mentioned circuits, the same reference numerals are assigned to the same parts as those of the liquid crystal display device used in the basic discussion, and the description thereof will be omitted, and the different parts will be described.

[0157]

[0158] The reference voltage generating circuit 500 in this embodiment includes: a voltage dividing circuit...

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PUM

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Abstract

A display device and a driving method of the display device, with which a gamma characteristic can easily and speedily be corrected when a display part is renewed, are provided. When power of a liquid crystal display device is turned on, provisional gradation reference voltage generated by a voltage dividing circuit where a plurality of resistors are connected in series is given to a source driver. Thus, the source driver generates a provisional gradation voltage group based on given provisional gradation reference voltage. When a power supply circuit is started, gradation voltage data given from a display control circuit is D / A-converted by a D / A converter and regular gradation reference voltage is generated. When regular gradation reference voltage is generated, regular gradation reference voltage is given to the source driver instead of provisional gradation reference voltage. The source driver generates regular gradation voltage based on regular gradation reference voltage insteadof provisional gradation voltage.

Description

technical field [0001] The present invention relates to a display device and its driving method, in particular to an active matrix type display device for gray scale display and its driving method. Background technique [0002] Active-matrix liquid crystal display devices have been used as monitors for notebook computers and computers because they can display color or black-and-white grayscale according to input video signals. However, in recent years, with the development of multi-gradation and high-resolution, it is also used in electronic equipment such as mobile phones, car navigation systems, and television receivers. [0003] Figure 9 It is a block diagram showing the overall structure of a conventional active-matrix liquid crystal display device used in the above-mentioned electronic equipment. Such as Figure 9 As shown, the liquid crystal display device has: a liquid crystal panel (display portion) 100 including a plurality of pixel forming portions arranged in a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG09G2330/026G09G2320/08G09G3/3688G09G2310/027G09G2320/0673G09G3/3614G09G2310/08G09G3/3696G09G2320/0276G09G3/3648
Inventor 松川年寿
Owner SHARP KK