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Pixel circuit and display device

A pixel circuit and display element technology, applied in static indicators, nonlinear optics, instruments, etc., can solve the problems of reduced display quality, lack of contrast, lower average potential, etc.

Inactive Publication Date: 2014-10-08
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the average potential of each frame period also decreases, which may result in a decrease in display quality such as insufficient contrast.

Method used

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Experimental program
Comparison scheme
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no. 1 Embodiment approach

[0348] In the first embodiment, configurations of a display device of the present invention (hereinafter referred to as "display device") and a pixel circuit of the present invention (hereinafter referred to as "pixel circuit") will be described.

[0349] "Display Device"

[0350] figure 1A schematic configuration of the display device 1 is shown. The display device 1 includes an active matrix substrate 10 , counter electrodes 80 , a display control circuit 11 , a counter electrode drive circuit 12 , a source driver 13 , a gate driver 14 , and various signal lines described later. On the active matrix substrate 10, a plurality of pixel circuits 2 are respectively arranged in row and column directions, forming a pixel circuit array.

[0351] In addition, in figure 1 In , the pixel circuit 2 is displayed in blocks in order to avoid the complexity of the drawing. In addition, in order to clarify that various signal lines are formed on the active matrix substrate 10 , the ac...

no. 2 Embodiment approach

[0422] In the second embodiment, the self-refresh operation of the pixel circuits of the first to sixth types in the respective groups X and Y described above will be described with reference to the drawings.

[0423] The so-called self-refresh operation refers to the operation in the constant display mode to make the first switch circuit 22, the second switch circuit 23 and the control circuit 24 operate in a predetermined order for a plurality of pixel circuits 2, so that the potential of the pixel electrode 20 (This is also the potential of the internal node N1.) Simultaneously restores to the potential written in the immediately preceding write operation. The self-refresh operation is an operation unique to the present invention performed by each of the above-mentioned pixel circuits. Compared with the "external refresh operation" in which the potential of the pixel electrode 20 is restored by performing a normal write operation as in the past, it can achieve a significantl...

no. 3 Embodiment approach

[0497] In the third embodiment, the self-polarity inversion operation of the pixel circuits of the first to sixth types of the respective groups X and Y described above will be described with reference to the drawings.

[0498] The so-called self-polarity inversion operation refers to an operation in which the first switch circuit 22, the second switch circuit 23, and the control circuit 24 are operated in a predetermined order for a plurality of pixel circuits 2 during the operation in the constant display mode, and the The polarity of the liquid crystal voltage Vlc applied between the pixel electrode 20 and the opposite electrode 80 is reversed altogether while maintaining its absolute value as it is. The self-polarity inversion operation is an operation unique to the present invention performed by each pixel circuit described above, and can significantly reduce power consumption compared to the conventional "external polarity inversion operation". In addition, "simultaneous...

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Abstract

Provided is a display device capable of reducing power consumption without reducing the aperture ratio. The liquid crystal capacitive element (Clc) is formed between the pixel electrode 20 and the counter electrode (80). A counter voltage (Vcom) is applied to the counter electrode (80). The pixel electrode (20), one end of the first switch circuit (22), one end of the second switch circuit (23), and the first terminal of the second transistor (T2) form an internal node (N1). The other end of the first switch circuit (22) is connected to the source line (SL). The other end of the second switch circuit (23) is connected to the voltage supply line (VSL). The second switch circuit (23) includes a series circuit of a transistor (T1) and a transistor (T3). The second terminal of (T2) and one end of the boost capacitor element (Cbst) form an output node (N2). The other end of the boost capacitor (Csbt) is connected to the boost line (BST), the control terminal of the transistor (T2) is connected to the reference line (REF), and the control terminal of the transistor (T3) is connected to the select line (SEL).

Description

technical field [0001] The present invention relates to a pixel circuit and a display device including the pixel circuit, and particularly to an active matrix display device. Background technique [0002] In portable terminals such as mobile phones and portable game machines, a liquid crystal display device is generally used as a display unit thereof. In addition, since mobile phones and the like are driven by batteries, reduction in power consumption is strongly demanded. Therefore, information that needs to be constantly displayed, such as the time and the remaining battery level, is displayed on the reflective sub-panel. In addition, recently, it has been demanded to use the same main panel for a normal display of a full-color display and a reflective type constant display. [0003] Figure 49 An equivalent circuit of a pixel circuit of a general active matrix liquid crystal display device is shown. in addition, Figure 50 A circuit configuration example of an active ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G02F1/133G02F1/1368G09G3/20
CPCG09G2300/0852G09G3/3659
Inventor 山内祥光
Owner SHARP KK
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