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Liquid crystal display device and driver circuit therefor

A technology of a liquid crystal display device and a drive circuit, which is applied to static indicators, instruments, etc., and can solve the problems of reduced power consumption in standby screens and ineffective power consumption, and achieve the effect of reducing power consumption

Inactive Publication Date: 2006-02-01
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, in the display devices of portable electronic devices such as mobile phones, it is important to reduce power consumption, especially the technology of reducing power consumption of the standby screen, but the technology of Patent Document 1 only detects still images and moving images, and controls the driving frequency. , drive method, and backlight lighting method, so it has no effect on reducing power consumption on the standby screen with many static image states
In particular, the standby screen often performs partial display using only a part of the display device for display, but such partial display is not considered in Patent Document 1, so it is not necessarily effective in reducing power consumption.

Method used

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  • Liquid crystal display device and driver circuit therefor
  • Liquid crystal display device and driver circuit therefor
  • Liquid crystal display device and driver circuit therefor

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Experimental program
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Effect test

Embodiment 1

[0028] Next, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of Embodiment 1 of a liquid crystal display device 1 of the present invention. The liquid crystal display device 1 includes: a liquid crystal panel 2, a plurality of pixels not shown are arranged at each intersection of a plurality of scanning lines and a plurality of data lines; a scanning line driving circuit 4 is used to drive the above scanning lines; The circuit 5 is used to drive the above-mentioned data lines; and the display control circuit 3 is used to control the scanning line driving circuit 4 and the data line driving current 5 . In addition, although not shown, the liquid crystal display device 1 includes a power supply circuit and the like. A control signal including an image signal input from a CPU 6 of a portable electronic device such as a mobile phone is input to the display control circuit 3, and an image is displayed on the liquid ...

Embodiment 2

[0051] In Embodiment 2, as a driving method for saving power on the standby screen, the following partial display mode is performed: Figure 11 Displayed in a specific partial area shown, and not displayed in other areas (hereinafter referred to as partial mode). Here, an example is shown in which the regions G001 to G181 and the regions G204 to G320 are not displayed on the standby screen, and only the regions between the regions G181 to G204 are partially displayed on the standby screen.

[0052] Figure 12 The flow chart of determining the driving method (S300) of the second embodiment is shown in . After a control signal is input (S301), the control signal is judged (S302), and if it is a partial mode, it is judged whether it is a binary mode (S303). For the partial display area, if it is a 64 grayscale mode, dot inversion driving is performed (S304), and if it is a binary mode, V line inversion driving is performed (S305). Furthermore, in the case of any mode, for the ...

Embodiment 3

[0057] The recent mobile phones not only have the purpose of calling, but also have various functions such as camera function, TV phone, etc. When the camera takes pictures, TV reception, TV phone, games, etc., many provide moving images, and others provide still images. In this way, the user of the mobile phone can set whether it is an animation or a static image by selecting a menu screen, button operation, etc., so as in Patent Document 1, there is no need to judge the change of the image, and the animation mode is provided from the CPU 6 to the display control circuit 3 when it is an animation. signal by which reduction in power consumption can be achieved.

[0058] Embodiment 3 is to identify the animation and static images to reduce power consumption, Figure 14 The figure shows a flow chart of determining the driving method and frequency (S400). First, after a control signal is input (S401), it is judged whether it is an animation mode signal or a still picture mode si...

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Abstract

The invention reduces the power consumption for a standby screen on a liquid crystal display. When the standby screen is displayed on a liquid crystal display, a power saving signal is inputted from a CPU, and a binary mode and a partial mode are determined. In the case of the binary mode, V line inversion drive is employed against dot inversion drive in a normal display mode to save the power. In the case of the partial mode, a display area is driven by dot inversion drive and a non-display area is driven by V line inversion drive, unless the binary mode is set; and the display area and the non-display area are driven by V line inversion drive with different frequencies, when the binary mode is set.

Description

technical field [0001] The present invention relates to a liquid crystal display device, in particular to a technology for realizing low power consumption of an active matrix liquid crystal display device. Background technique [0002] Liquid crystal display devices are used as display devices for various electronic devices such as mobile phones because of their low power consumption, lightness, and thinness. Liquid crystal display devices include a simple matrix type and an active matrix type (AMLCD: Active Matrix Liquid Crystal Display) using active elements such as TFTs (Thin Film Transistors) for pixels. As a driving method for this active matrix liquid crystal display device, frame inversion driving, H row inversion (row inversion) driving, V row inversion (column inversion) driving, and dot inversion driving are known. Among them, the frame inversion drive has the problem of easy to see flicker, and the V line inversion drive has the problem of easy vertical stripes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCG09G2320/0247G09G2310/027G09G2330/021G09G3/2011G09G2340/0428G09G3/3614G09G2330/023G09G2310/0297G09G3/3688G09G2310/0232G09G2310/0251G09G2320/0233G09G2320/10G09G3/3696G09G2310/0224G09G3/36
Inventor 桥本义春久米田诚之松浦浩二
Owner RENESAS ELECTRONICS CORP