Shift register circuit and display panel

A shift register and circuit technology, applied in static memory, digital memory information, instruments, etc., can solve problems such as increased power consumption, abnormal output signals, etc., and achieve the effect of simple structure and low cost

Inactive Publication Date: 2019-03-15
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the transistor becomes a depletion type, leakage current from the TFT occurs, which causes malfunctions such as an increase in power consumption and an abnormality in the output signal.

Method used

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  • Shift register circuit and display panel
  • Shift register circuit and display panel
  • Shift register circuit and display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] figure 1 It is a diagram showing the configuration of the liquid crystal display device in the first embodiment. Such as figure 1 As shown, the liquid crystal display device includes a display panel 2 , a flexible printed substrate 3 , and a control substrate 4 .

[0043] The display panel 2 is an active matrix display panel. In the display panel 2, a display region 2a, a plurality of gate lines (scanning signal lines), a plurality of source lines (data signal lines), gate The electrode line driving circuit 5 and the source line driving circuit 6 are an active matrix type display panel.

[0044] In the display area 2a, a plurality of pixels PIX are arranged in a matrix. The pixel PIX includes a TFT 8 as a pixel selection element, a liquid crystal capacitor, and an auxiliary capacitor. The gate of TFT8 is connected to the gate line, and the source of TFT8 is connected to the source line. The liquid crystal capacitor and the auxiliary capacitor are connected to the ...

Embodiment approach 2

[0132] In the unit shift register SR in Embodiment 1, the first transistor Q1 and the transistor Q5 for a back gate are normally closed in an initial state. On the other hand, in the unit shift register SR in the second embodiment, the back gate transistor Q5 is normally open from the initial state.

[0133] Figure 10 It is a graph showing the characteristics of the drain-source current when the transistor Q5 for a back gate is normally closed (Embodiment 1) and normally open (Embodiment 2). Such as Figure 10 As shown, when the back gate transistor Q5 is normally closed, almost no current flows between the drain and the source when the gate and the source are at the same potential. On the other hand, when the back gate transistor Q5 is normally open, a current flows between the drain and the source even if the gate and the source are at the same potential.

[0134] In particular, it is known that a TFT using an oxide semiconductor tends to be normally on depending on the ...

Embodiment approach 3

[0148] Figure 15 It is a figure which shows the structure of the unit shift register SR in this Embodiment 3. In the back gate voltage generation circuits 300 and 300A of Embodiments 1 and 2 ( Figure 4 , 11 ) shows the case where the back gate node N2 is connected only to the back gate capacitive element C2. On the other hand, the back gate voltage generation circuit 300B of Embodiment 3 further includes a capacitive element C3 for voltage division.

[0149] Such as Figure 15 As shown, the capacitive element C3 for voltage division is connected between the node N2 for the back gate and the first power supply terminal S2 having the potential VSS. The back gate node N2 is connected between the back gate capacitive element C2 and the voltage dividing capacitive element C3.

[0150] In the third embodiment, since the structure of the liquid crystal display device and the structure of the shift register circuit 1 are different from those of the first embodiment ( figure 1 ...

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Abstract

The purpose of the present invention is to provide a shift register circuit and a display panel that appropriately control the back-gate voltage of a transistor using a simple configuration at low cost. Each of a plurality of shift register (SR) in a shift register circuit (1) includes an output circuit (100), a charge-discharge circuit (200), a first power supply terminal (S2) for supplying the charge-discharge circuit (200) with a constant voltage, and at least one back-gate voltage generation circuit (300). The output circuit (100) or the charge-discharge circuit (200) includes at least onetransistor (Q1) having a back-gate electrode. The back-gate voltage generation circuit (300) includes a back-gate node (N2). The back-gate node (N2) is connected to the back-gate electrode of the transistor (Q1). The back-gate voltage generation circuit (300) changes the voltage of the back-gate node (N2) in accordance with the voltage of the gate electrode of the transistor (Q1), and the first power supply terminal (S2) supplies the back-gate voltage generation circuit (300) with a drive voltage.

Description

technical field [0001] The present invention relates to a shift register circuit and a display panel, in particular to a shift register circuit and a display panel provided with a plurality of unit shift registers connected in multi-stage cascade. Background technique [0002] In an image display device such as a liquid crystal display device, a shift register that performs one round of shift operation during one frame period of a display signal can be used as a gate line driver circuit (scanning line driver circuit) for scanning a display panel. In order to reduce the number of steps in the manufacturing process of the display device, it is desirable that the shift register includes only field effect transistors of the same conductivity type. [0003] A display device in which a shift register of a gate line driver circuit is formed by a thin-film transistor (hereinafter referred to as "TFT") whose channel region is made of an amorphous semiconductor is easy to increase in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C19/28G09G3/20G09G3/36H03K17/30
CPCG09G3/20G09G3/36G11C19/28H03K17/30G09G2310/0286G11C19/184G09G3/3677G09G2300/0408G09G2310/0267G11C19/287
Inventor 大野岳上里将史藤野俊明川渕真嗣
Owner MITSUBISHI ELECTRIC CORP
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