Driver for liquid crystal display

A liquid crystal display and drive circuit technology, applied to static indicators, cathode ray tube indicators, instruments, etc., can solve problems such as waste of power consumption, and achieve the effect of reducing power consumption

Inactive Publication Date: 2007-07-04
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this point, amplifier 361 1 to 361 176 Staying in the working state until the above-mentioned predetermined time is reached, even after the voltage of the output terminal via the latter has reached the target value, which leads to waste of power consumption

Method used

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  • Driver for liquid crystal display
  • Driver for liquid crystal display
  • Driver for liquid crystal display

Examples

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Embodiment Construction

[0044] The invention will now be described with reference to illustrative embodiments. Those skilled in the art will recognize that many alternative embodiments can be accomplished using the teachings of the present invention and that the invention is not limited to the embodiments described for explanatory purposed.

[0045] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. Fig. 1 illustrates an embodiment of the present invention, the same elements as in Fig. 7 are denoted by the same reference numerals or signs, and a repeated description is not provided here. This embodiment uses a controller 500 instead of the controller 200 of FIG. 7 . Elements other than the controller 500 are the same as those in FIG. 7 . This embodiment is applicable to the driving circuits of the line inversion driving scheme and the frame inversion driving scheme, but not applicable to the driving circuit of the dot inversion driving sc...

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Abstract

The invention relates to a driver for liquid crystal display. In a liquid crystal display driving circuit, upon time-sharing output of gray scale voltages from an amplifier of an output circuit for each unit pixel composed of three sub-pixels of red(R), green(G) and blue(B) in the output sequence of R, G and B, a data matching detector compares gray scale data corresponding to R, G and B sub-pixels for each unit pixel and, it they match in all pixels of each scan line, a driving time of the amplifier is set such that G output interval and B output interval are shorter than R output interval at the top by an output control signal AS output from a control signal generator.

Description

technical field [0001] The present invention relates to a driver for a liquid crystal display, and more particularly to a driver for driving a liquid crystal panel used as a portable computer, a PDA (Personal Digital Assistant) or a portable electronic device such as a mobile phone and a PHS (Personal Handheld telephone system). Background technique [0002] As a driver of a liquid crystal display used in a portable electronic device, a liquid crystal display driver that outputs grayscale voltages in a time-division manner from a unit amplifier for at least each unit pixel of a liquid crystal panel is used. FIG. 7 shows a block diagram of an exemplary structure of a driver of such a liquid crystal panel 100 . In this example, the resolution of the liquid crystal panel 100 is 176×220 pixels. One pixel is composed of three sub-pixels of red (R), green (G), and blue (B), and thus a total of 528×220 sub-pixels. The time-sharing output of this example divides the output into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G09G5/02G02F1/133
CPCG09G3/3688G09G3/3648G09G2300/0452G09G2310/0235G09G2310/027
Inventor 田中义之
Owner RENESAS ELECTRONICS CORP
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