Shift-register circuit and display device containing same

A shift register and circuit technology, applied in static memory, digital memory information, instruments, etc., can solve the problem of reduced operating margin of shift register circuits, and achieve the effect of improving operating margin

Inactive Publication Date: 2017-02-22
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the operating margin of the shift register circuit decreases

Method used

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  • Shift-register circuit and display device containing same
  • Shift-register circuit and display device containing same
  • Shift-register circuit and display device containing same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach ＞

[0076] (Configuration of liquid crystal display device)

[0077] figure 1 It is a schematic diagram showing the schematic configuration of the liquid crystal display device of the present embodiment. The liquid crystal display device 1 has a display panel 2 , a source driver 3 , a display control circuit 4 and a power supply 5 . The display panel 2 has an active matrix substrate 20a, a counter substrate 20b, and a liquid crystal layer (not shown) sandwiched between these substrates. exist figure 1 Although not shown, a pair of polarizing plates are provided to sandwich the active matrix substrate 20a and the counter substrate 20b. A black matrix, color filters of three colors of red (R), green (G), and blue (B), and a common electrode (both not shown) are formed on the counter substrate 20b.

[0078] Such as figure 1 As shown, the active matrix substrate 20a is electrically connected to the source driver 3 formed on the flexible substrate. The display control circuit 4 i...

no. 2 Embodiment approach ＞

[0147] In the above-mentioned first embodiment and its application examples, an example in which the decrease in the precharge voltage of netA is suppressed and the operating margin of the gate driver is improved has been described. The reason for the decrease in the operating margin of the gate driver is that the potential of netA is not sufficiently lowered when the gate line is switched to the non-selection period. In particular, when the gate driver is arranged in the display area, it may not be possible to reliably pull down netA due to the influence of parasitic capacitance generated between elements such as the source line 15S and the wiring 15L arranged in the display area. to low level. In this embodiment, an example will be described in which the potential of netA is pulled down more reliably when the gate line is brought into the non-selected state in order to increase the operating margin of the gate driver. Configurations different from those of the first embodim...

no. 3 Embodiment approach ＞

[0164] In the above-mentioned second embodiment, in order to improve the operating margin of the gate driver, netA of another drive circuit was connected to the gate terminal of TFT-K functioning as a gate voltage discharge unit, and the TFT-K An example of increased drive. In this embodiment, discharge of the gate line when the gate line transitions to a non-selection period is strengthened to improve the operating margin of the gate driver. Hereinafter, configurations different from those of the second embodiment will be described.

[0165] (circuit configuration)

[0166] Figure 16 It is a diagram illustrating an equivalent circuit of the drive circuit 112 of the present embodiment. Such as Figure 16 As shown, in the drive circuit 112(n) for driving the gate line 13G(n), the gate terminal of the TFT-K for pulling down the potential of netA(n) is connected to the gate line 13G(n+2). , the drain terminal is connected to netA(n), and the source terminal is input with th...

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PUM

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Abstract

Each driver circuit in this shift register comprises an output section, a precharge section, a voltage-increasing section, a gate-voltage discharge section, a gate-wire discharge section, and internal wiring (netA). The output section contains a TFT (F) that outputs a selection voltage to a gate wire. The precharge section contains a TFT (B) that outputs a control voltage that operates the TFT in the output section. The voltage-increasing section increases the gate voltage of the TFT in the output section via a capacitor (Cbst). The gate-voltage discharge section contains a TFT (K) that lowers said gate voltage during a period during which the gate wire is not selected. The gate-wire discharge section contains a TFT (L) that outputs a non-selection voltage to the gate wire during said period. The internal wiring is connected to the gate terminal of the TFT in the output section, the precharge section, the gate-voltage discharge section, and the voltage-increasing section. The gate terminal of at least one of the TFTs in the precharge section, the gate-voltage discharge section, and the gate-wire discharge section is connected to the internal wiring in another driver circuit.

Description

technical field [0001] The present invention relates to a shift register circuit and a display device including the same. Background technique [0002] Conventionally, a shift register circuit that sequentially scans a plurality of gate lines provided on an active matrix substrate is known. The shift register circuit includes a drive circuit for each gate line, and the drive circuit includes: an output transistor for switching the gate line to a selected state; a precharge transistor for precharging the gate voltage of the output transistor; and Bootstrap capacitor to boost precharge voltage. A diode-connected transistor is used for the precharge transistor, and the precharge voltage becomes a voltage value lowered by the threshold voltage of the precharge transistor. When the precharge voltage decreases due to an increase in the threshold voltage due to deterioration of the transistor, the gate voltage of the output transistor also decreases, and the operation of the driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C19/28G09G3/20G09G3/36G11C19/00
CPCG11C19/28G09G3/3677G09G2300/0408G09G2300/0426G09G2310/08G09G3/3648G09G2310/0286
Inventor 田中耕平野间健史西山隆之米林谅小川康行山本薰
Owner SHARP KK
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