Pixel circuit and display device

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

Inactive Publication Date: 2012-10-10
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, whic

Method used

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no. 1 Embodiment approach

[0184] 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.

[0185] "Display Device"

[0186] figure 1 A 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.

[0187] 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 a...

no. 2 Embodiment approach

[0239] In the second embodiment, circuits representing the first to sixth types described above will be described with reference to the drawings. Figure 6 The self-refresh operation of the first type pixel circuit 2A is shown. In addition, as will be described later, in other types of pixel circuits, a self-refresh operation can be realized similarly to the case of the first type.

[0240] 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 the above-mentioned pixel circuits 2A to 2F. Compared with...

no. 3 Embodiment approach

[0289] In the third embodiment, circuits representing the first to sixth types described above will be described with reference to the drawings. Figure 6 The self-polarity inversion operation of the first type pixel circuit 2A is shown. In addition, as will be described later, in other types of pixel circuits, the self-polarity inversion operation can be realized similarly to the case of the first type.

[0290] 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 pe...

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PUM

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Abstract

Disclosed is a display device wherein power consumption is reduced without causing deterioration of an aperture ratio. A liquid crystal capacitive element (Clc) is formed by being sandwiched between a pixel electrode (20) and a counter electrode (80). A counter voltage (Vcom) is applied to the counter electrode (80). The pixel electrode (20), one end of a first switch circuit (22), one end of a second switch circuit (23), and the first terminal of a second transistor (T2) form an internal node (N1). The other end of the first switch circuit (22) and the other end of the second switch circuit (23) are connected to a source line (SL). The second switch circuit (23) is configured with a series circuit of a transistor (T1) and a transistor (T3), and the control terminal of the transistor (T1), the second terminal of the transistor (T2) and one end of a boost capacitive element (Cbst) form an output node (N2). The other end of the boost capacitive element (Csbt) is connected to a boost line (BST), the control terminal of the transistor (T2) is connected to a reference line (REF), and the control terminal of the transistor (T3) is connected to a selection 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 34 An equivalent circuit of a pixel circuit of a general active matrix liquid crystal display device is shown. in addition, Figure 35 A circuit configuration example of an active ...

Claims

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Application Information

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IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG09G2300/0852G09G3/3659G02F1/13624
Inventor 山内祥光
Owner SHARP KK
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