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Pixel circuit and display apparatus

一种像素电路、显示装置的技术，应用在静态指示器、仪器等方向，能够解决平均电位降低、无法获得对比度等显示质量等问题

Inactive Publication Date: 2012-07-18
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Pixel circuit and display apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0129] In the first embodiment, configurations of a display device of the present invention (hereinafter simply referred to as "display device") and a pixel circuit of the present invention (hereinafter simply referred to as "pixel circuit") will be described.

[0130] 【Display device】

[0131] figure 1 A schematic configuration of the display device 1 is shown. The display device 1 includes an active matrix substrate 10 , opposing electrodes 80 , a display control circuit 11 , an opposing electrode driving 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 the row and column directions, forming a pixel circuit array.

[0132] In addition, in figure 1 In , in order to avoid complicated drawings, the pixel circuit 2 is shown in blocks. In addition, in order to clearly show that various signal lines are formed on the active matrix subs...

no. 2 approach

[0191] In the second embodiment, the self-refresh operation of each of the first to third types of pixel circuits described above will be described with reference to the drawings.

[0192] The self-refresh operation refers to operating the first switch circuit 22, the second switch circuit 23, and the control circuit 24 at a predetermined timing for a plurality of pixel circuits 2 in the operation of the continuous display mode, and making the pixel circuits 20 The operation of returning the potential (also the potential of the internal node N1) to the potential of the gray level written in the previous write operation is aimed at the pixel circuits of all gray levels, simultaneously and uniformly for each gray level recovery. The self-refresh operation is a unique operation of the present invention using the above-mentioned pixel circuits 2A to 2E, and compared with the "external refresh operation" in which the potential of the pixel electrode 20 is restored by performing a n...

no. 3 approach

[0281]In the third embodiment, a case where a self-refresh operation is performed by a voltage application method different from that in the second embodiment will be described with reference to the drawings. Here, the self-refresh operation in this embodiment is divided into a refresh step S1 and a standby step S2 as in the second embodiment.

[0282] In the second embodiment, only the internal node N1 of instance H (writing high voltage) is refreshed in phase P1, and only the internal node N1 of instance M (writing medium voltage) is refreshed in phase P2. Furthermore, in step S1, it is necessary to apply a pulse voltage to the boost line BST in the phase P1 and the phase P2, respectively.

[0283] On the contrary, in this embodiment, as described later, only the internal node N1 of instance M (writing medium voltage) is refreshed in phase P1, and only the internal node N1 of instance H (writing high voltage) is refreshed in phase P2. Node N1. In addition, in step S1, a hi...

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PUM

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Abstract

Disclosed is a display apparatus wherein a reduction of power consumption is achieved without deteriorating the aperture ratio. A liquid crystal capacitive element (Clc) is formed by being sandwiched between a pixel electrode (20) and a 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) is connected to a source line (SL), and the other end of the second switch circuit (23) is connected to a voltage supply line (VSL). The second switch circuit (23) is configured with a series circuit composed of a transistor (T1) and a diode (D1), 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 (Cbst) is connected to a boost line (BST), and the control terminal of the transistor (T2) is connected to a reference line (REF). The diode (D1) has a rectifying behavior in the direction toward the internal node (N1) from the voltage supply line (VSL).

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] Portable terminals such as mobile phones and portable game machines generally use liquid crystal display devices as their display units. In addition, since mobile phones and the like are driven by batteries, reduction in power consumption (power consumption) is urgently required. For this reason, information that needs to be constantly displayed (constantly displayed), such as the time of day and the remaining battery level, is displayed on a reflective sub-panel (sub-panel). In addition, recently, there has also been a demand for both normal display by full-color display and reflective continuous display on the same main panel. [0003] Figure 35 An equivalent circuit of a pixel circuit of a general active matrix type liquid crystal display device is shown. in addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG09G2300/0465G09G2300/0814G09G3/367G09G3/3659G09G2330/021G09G2340/0428G09G3/3655G09G3/3618G09G2300/0833G09G3/3614G09G3/3648G09G2300/0876
Inventor 山内祥光
Owner SHARP KK
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