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Shut-down control method and circuit, driving circuit and AMOLED display device

A shutdown control and display device technology, applied to static indicators, instruments, etc., can solve problems such as image retention and rising

Inactive Publication Date: 2014-07-23
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the actual situation is because the gate stress has been applied to T1 and T2, the threshold voltage of T1 and the threshold voltage of T2 have risen. At this time, the 0V applied to the gate of T1 and the gate of T2 is a In the closed state, the charges stored on C1 and C2 are stored for a long time and cannot be discharged, even if the whole system has not provided any power supply, this result causes the gate terminals of the first drive transistor TFT1 and the second drive transistor TFT2 to be subjected to long-term Therefore, when the user turns on the next time, the user will find that the image of the last screen of the last shutdown appears on the AMOLED display screen, which is caused by the long-term gate stress of the driving transistor after the shutdown.

Method used

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  • Shut-down control method and circuit, driving circuit and AMOLED display device
  • Shut-down control method and circuit, driving circuit and AMOLED display device
  • Shut-down control method and circuit, driving circuit and AMOLED display device

Examples

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no. 1 example

[0042] Such as figure 2 As shown, the first embodiment of the shutdown control method of the present invention includes:

[0043] Judging step 21: judging whether a shutdown signal is detected;

[0044] Voltage control step 22: when it is judged that a shutdown signal is detected, perform a first control operation, so that the voltage on the signal line is in a first voltage state;

[0045] Discharging control step 23: performing a second control operation, controlling the switching element to be in a conducting state, so that the capacitor is completely discharged to the signal line in the first voltage state through the switching element.

[0046] In the shutdown control method described in the embodiment of the present invention, when it is determined that a shutdown signal is detected, control the signal line connected to the capacitance between the gate and source of the drive transistor included in each sub-pixel through a switch element to be at The first voltage sta...

no. 2 example

[0054] The second embodiment of the shutdown control method of the present invention includes:

[0055] Determine whether a shutdown signal is detected;

[0056] When it is judged that the power-off signal is detected, control to turn off the power supply of the data driving circuit 31, so that the data voltage on the data line is 0;

[0057] Controlling the scan voltage Vscan provided by the scan drive circuit 32 to the scan line to be in a second voltage state, so that the data input transistor T1 is turned on, so that the capacitance is supplied to the data through the data input transistor T1 The line is completely discharged, and after the capacitor C1 is completely discharged, the power supply of the scanning driving circuit 32 is controlled to be turned off.

[0058] exist image 3 Among them, OLED indicates an organic light-emitting diode, and ELVDD and ELVSS indicate a high-level output terminal of a driving power supply and a low-level output terminal of a driving ...

no. 3 example

[0064] The third embodiment of the shutdown control method of the present invention includes:

[0065] Determine whether a shutdown signal is detected;

[0066] When it is judged that the shutdown signal is detected, control to turn off the power supply of the data driving circuit 31, so that the data voltage Vdata on the data line is 0;

[0067] Control the scan drive circuit 32 to continue to provide scan voltage Vscan for the scan line, so that the data input transistor T1 is turned on, and control to turn off the power supply of the scan drive circuit 32 after at least one scan cycle, so that all The capacitor C1 is completely discharged to the data line Data through the data input transistor T1.

[0068] In the third embodiment of the shutdown control method of the present invention, the data input transistor T1 and the data line already used in the prior art are used to control the capacitor C1 to fully discharge, which saves resources while avoiding image retention. M...

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Abstract

The invention provides a shut-down control method and circuit, a driving circuit and an AMOLED display device. The shutdown control method is applied to the AMOLED display device. The AMOLED display device comprises a luminous source and a display screen provided with a plurality of sub pixels. Each sub pixel comprises a driving transistor and a capacitor arranged between a grid electrode and a source electrode of the driving transistor, wherein the capacitor is connected with a signal line through a switching element. The shutdown control method comprises the steps of judging whether a shutdown signal is detected or not; when it is judged that the shutdown signal is detected, executing a first control operation, and enabling the voltage on the signal line to be in the first voltage state; executing a second control operation, and controlling the switching element to be in the conducting state so that the capacitor can conduct full discharging on the signal line in the first voltage state through the switching element. According to the shut-down control method and circuit, the driving circuit and the AMOLED display device, image retention caused when the driving transistors in the AMOLED display device bear the grid electrode stress for a long time after being shut down can be avoided.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a shutdown control method and circuit, a driving circuit and an AMOLED display device. Background technique [0002] In the existing IGZO (Indium Gallium Zinc Oxide, indium gallium zinc oxide) AMOLED (Active Matrix / Organic Light Emitting Diode, active matrix organic light emitting diode) display device, when the TFT (thin film field effect) in the pixel unit drive circuit When the transistor (Thin Film Transistor) is subjected to gate stress, it will cause a threshold shift, which will lead to the visual effect of image retention. [0003] Specifically, such as figure 1 As shown, taking the 2T1C pixel unit driving circuit as an example, once the input power is turned off, the scanning voltages Vscan1 and Vscan2 connected to the gate of the first data input transistor T1 and the gate of the second data input transistor T2 should drop first. To 0V, the reason is that the scannin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225
CPCG09G3/3233G09G3/3266G09G2300/0842G09G2320/0257G09G2330/027
Inventor 曾思衡
Owner BOE TECH GRP CO LTD