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GOA circuit

A circuit and voltage technology, applied in the field of display, can solve problems such as the inability to meet the wide pulse requirements of GOA circuits, the failure of GOA circuits, and the infeasibility of circuits, etc., to achieve narrow borders, good output, and improved reliability. Effect

Inactive Publication Date: 2019-11-05
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0005] figure 2 for figure 1 The timing diagram of the circuit shown shows the output of the circuit. It can be seen from the figure that since the circuit is not provided with a sub-circuit to prevent the negative bias of the threshold voltage Vth, in the stage where the potential of the point Q is coupled (couple), the voltage of the point Q The potential is difficult to maintain and gradually decreases. Although the output signal G(n) is still valid, if the threshold voltage Vth of the TFT is negatively biased during the operation of the GOA circuit, the GOA circuit is prone to failure
also, figure 1 The working pulse width of the GOA circuit is 15 microseconds (us). At present, the pixel circuit of the AMOLED display panel mainly adopts an external compensation method. The GOA circuit cannot meet the wide pulse demand of the GOA circuit
Therefore, the circuit is not feasible

Method used

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Embodiment Construction

[0035] see image 3 , which is a schematic diagram of a single-stage GOA unit structure of a preferred embodiment of the GOA circuit of the present invention. The number of TFTs in the GOA unit is six, and the TFT can be designed with a double-gate TFT, wherein the top gate of the TFT can be used to connect to the GOA circuit. node, the bottom gate can be used to connect an external voltage source. The present invention adopts a group of CK clock signals (a total of three clock signals, CK1, CK2, CK3) to drive, the waveform of the first clock signal CK1, the second clock signal CK2 and the third clock signal CK3 are the same, and the duty ratio is three minutes. One, and the phases are sequentially different by one-third of the cycle, and the GOA units at all levels input the corresponding two clock signals according to the driving timing, image 3 The single-stage GOA unit shown is illustrated by taking the first clock signal CK1 and the second clock signal CK2 as examples. ...

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Abstract

The invention relates to a GOA circuit. The GOA circuit comprises a plurality of cascaded GOA units. The n-th GOA unit comprises a first thin film transistor (T1), a second thin film transistor (T2),a third thin film transistor (T31), a fourth thin film transistor (T32), a fifth thin film transistor (T41), a sixth thin film transistor (T42) and a storage capacitor (Cbt). At least one of the firstthin film transistor (T1), the second thin film transistor (T2), the fourth thin film transistor (T32), the fifth thin film transistor (T41) and the sixth thin film transistor (T42) is a bigrid thinfilm transistor. Top gates of the double-gate thin film transistors serve as gates to be connected into the GOA unit, and bottom gates of the double-gate thin film transistors are connected with corresponding potential-adjustable bottom gate voltages. According to the GOA circuit, the threshold voltage Vth of a TFT in the GOA circuit can be adjusted; and independent control of the threshold voltage Vth of each TFT is realized.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a GOA circuit. Background technique [0002] At present, the driving of the horizontal scanning lines of the AMOLED (active matrix organic light-emitting diode) display panel is realized by an external integrated circuit, which can control the step-by-step opening of the scanning lines of each row, while the row driving of the array substrate ( The GOA (Gate Driver on Array) method can integrate the row scanning driving circuit on the display panel substrate, which can reduce the number of external chips (ICs), thereby reducing the production cost of the display panel, and can realize the narrow frame of the display device. . Indium gallium zinc oxide (IGZO) has high mobility and good device stability, and is currently widely used in indium gallium zinc oxide GOA (IGZO-GOA) circuits. The IGZO-GOA circuit can be used in the design of LCD display panels and OLED display panels. ...

Claims

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Application Information

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IPC IPC(8): G09G3/3266G09G3/3225
CPCG09G3/3225G09G3/3266G09G2310/0264
Inventor 薛炎
Owner SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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