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Liquid crystal display device, method of controlling liquid crystal display device, control program of liquid crystal display device, and storage medium for the control program

A technology of liquid crystal display device and control unit, which is applied to static indicators, nonlinear optics, instruments, etc., and can solve the problems of pixel characteristic change, image afterimage, afterimage, etc.

Inactive Publication Date: 2014-11-26
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, it is known that in a liquid crystal display device, when an electric field of the same polarity is continuously applied to a pixel, the polarization of liquid crystal molecules will occur, thereby causing problems such as changes in pixel characteristics and image sticking.
In addition, it is known that when the power of the liquid crystal display device is turned off in the state where the image is displayed, the applied voltage immediately before the power is turned off is still applied to each pixel, and the same image is continued to be drawn. Afterimage phenomenon

Method used

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  • Liquid crystal display device, method of controlling liquid crystal display device, control program of liquid crystal display device, and storage medium for the control program
  • Liquid crystal display device, method of controlling liquid crystal display device, control program of liquid crystal display device, and storage medium for the control program
  • Liquid crystal display device, method of controlling liquid crystal display device, control program of liquid crystal display device, and storage medium for the control program

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Embodiment approach 1

[0036] One embodiment of the present invention will be described.

[0037] figure 1 It is an explanatory diagram showing a schematic configuration of the liquid crystal display device 100 of the present embodiment. As shown in the figure, a liquid crystal display device 100 has a power supply circuit 1 , a control circuit (control unit) 2 , a gate driver 3 , a source driver 4 , and a liquid crystal panel 5 .

[0038] The power supply circuit 1 receives power supplied from the outside of the power supply circuit 1 (for example, a commercial power supply, a self-generated power supply, a charging device, etc.), supplies power to each block (each part) of the liquid crystal display device 100, and has a voltage drop detection circuit 11. , The main power supply circuit 12 and the auxiliary power supply circuit 13.

[0039] The voltage drop detection circuit (voltage detection unit) 11 detects that the liquid crystal display device 100 is powered off (power off due to a user's o...

Embodiment approach 2

[0108] Another embodiment of the present invention will be described. In addition, for the sake of convenience of description, parts having the same functions as those described in Embodiment 1 are denoted by the same reference numerals as in Embodiment 1, and description thereof will be omitted.

[0109] Figure 15 It is an explanatory diagram showing an example of control signals of the liquid crystal panel 5 in the liquid crystal display device 100 of the present embodiment, Figure 15 (a) indicates the control signal at the time of normal display, Figure 15 (b) shows a control signal at the time of power-off processing.

[0110] Such as Figure 15 As shown in (a), at the time of normal display, after the gate start pulse GSP becomes high level, the potential of the gate bus line 31 to be selected is controlled at the moment when the gate clock signal GCK is switched from low level to high level. switch to high level. In addition, the gate enable signal GOE is switche...

Embodiment approach 3

[0118] Still another embodiment of the present invention will be described. In addition, for the sake of convenience of explanation, the parts having the same functions as those described in the above-mentioned embodiment are given the same reference numerals as those in the embodiment, and the description thereof will be omitted.

[0119] Figure 16 It is an explanatory diagram showing an example of control signals of the liquid crystal panel 5 in the liquid crystal display device 100 of the present embodiment, Figure 16 (a) indicates the control signal at the time of normal display, Figure 16 (b) shows a control signal at the time of power-off processing.

[0120] Such as Figure 16 As shown in (a), the operation during normal display is the same as that shown in Embodiment 1. Figure 14 The operation of (a) is the same.

[0121] During power-off processing, such as Figure 16 As shown in (b), the period of the gate clock signal GCK is set to be shorter than the peri...

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PUM

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Abstract

While a power supply to a liquid crystal display device (100) is being turned off, a control circuit (2) sets a switching cycle of a gate bus line, via which writing is carried out, shorter than that during image display and carries out power-off processing in which a given voltage for power-off processing is applied to each source bus line. This makes it possible to provide, without greatly increasing a device cost, a liquid crystal display device capable of preventing a voltage from continuing to be applied to a pixel while the power supply is being turned off.

Description

technical field [0001] The present invention relates to a technique for suppressing continuation of voltage application to pixels when power is turned off in a liquid crystal display device. Background technique [0002] In the prior art, it is known that in a liquid crystal display device, when an electric field of the same polarity is continuously applied to a pixel, polarization of liquid crystal molecules will occur, thereby causing problems such as changes in pixel characteristics and image sticking. In addition, it is known that when the power of the liquid crystal display device is turned off in the state where the image is displayed, the applied voltage immediately before the power is turned off is still applied to each pixel, and the same image is continued to be drawn. Afterimage phenomenon. [0003] In addition, in recent years, a liquid crystal display device using a TFT including an oxide semiconductor (for example, an indium gallium zinc oxide semiconductor) h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/1368
CPCG09G3/3696G09G3/3614G09G3/3677G09G2310/067G09G2320/0204G09G2320/0257G09G2330/027
Inventor 泽边大一西户正典
Owner SHARP KK