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A pixel circuit, its driving method and related device

A technology of pixel circuit and driving transistor, which is applied in the direction of instruments and static indicators, etc., and can solve the problems of affecting image display effect, uneven display brightness, and current difference, etc.

Active Publication Date: 2018-09-11
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to reasons such as process technology and device aging, the threshold voltage V of the driving transistor of the pixel circuit will be th There is inhomogeneity, which causes the current flowing through each OLED to change, making the display brightness uneven, which affects the display effect of the entire image
And because the current flowing through each OLED is related to the source of the driving tube, that is, the power supply voltage, the current difference in different regions will also be caused due to IRDrop, which will cause uneven brightness of OLEDs in different regions.

Method used

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  • A pixel circuit, its driving method and related device
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  • A pixel circuit, its driving method and related device

Examples

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Effect test

Embodiment 1

[0097] Such as Figure 2a As shown, the driving transistor M0 is a P-type transistor, and all switching transistors are P-type transistors; each switching transistor is turned off under the action of a high level, and turned on under the action of a low level; the corresponding input timing diagram is as follows Figure 3a shown. Specifically, choose the Figure 3a The four stages T1, T2, T3 and T4 in the input timing diagram shown.

[0098] In the T1 stage, Scan=0, EM1=0, and EM2=1.

[0099] Because Scan=0, the first switch transistor M1, the second switch transistor M2 and the third switch transistor M3 are all turned on; because EM1=0, the fourth switch transistor M4 is turned on; because EM2=1, the fifth switch Both the transistor M5 and the sixth switching transistor M6 are turned off. The turned-on third switch transistor M3 converts the voltage V of the data signal terminal Data Data Provided to the first node A, that is, the first terminal of the capacitor C, so t...

Embodiment 2

[0108] Such as Figure 2b As shown, the driving transistor M0 is a P-type transistor, and all switching transistors are N-type switching transistors; each switching transistor is turned on under the action of a high level, and is turned off under the action of a low level; the corresponding input timing diagram is as follows Figure 3b shown. Specifically, choose the Figure 3b The four stages T1, T2, T3 and T4 in the input timing diagram shown.

[0109] In the T1 stage, Scan=1, EM1=1, and EM2=0.

[0110] Since Scan=1, the first switch transistor M1, the second switch transistor M2 and the third switch transistor M3 are all turned on; because EM1=1, the fourth switch transistor M4 is turned on; because EM2=0, the fifth switch Both the transistor M5 and the sixth switching transistor M6 are turned off. The turned-on third switch transistor M3 converts the voltage V of the data signal terminal Data Data Provided to the first node A, that is, the first terminal of the capaci...

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Abstract

The invention discloses a pixel circuit, its driving method, an organic electroluminescence display panel and a display device, including: a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light emission control module, a driving transistor and A light-emitting device; wherein, through the mutual cooperation of the above five modules and the driving transistor, the working current of the driving transistor in the pixel circuit to drive the light-emitting device to emit light is only related to the voltage of the data signal terminal and the voltage of the initial signal terminal, but not related to the voltage of the driving transistor The threshold voltage has nothing to do with the voltage of the first power supply terminal, which can avoid the influence of the threshold voltage of the driving transistor and IR Drop on the working current flowing through the light emitting device, so that the working current driving the light emitting device to emit light can be kept stable, thereby improving the picture of the display area in the display device Uniformity of brightness.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, an organic electroluminescent display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hot spots in the field of flat panel display research today. Compared with Liquid Crystal Display (LCD), OLED display has low energy consumption, low production cost, self-illumination, and wide viewing angle. and quick response. At present, OLED displays have begun to replace traditional LCD displays in display fields such as mobile phones, tablet computers, and digital cameras. [0003] Unlike LCDs that use a stable voltage to control brightness, OLEDs are driven by current and require a stable current to control their light emission. Due to reasons such as process technology and device aging, the threshold voltage V of the driving transistor of the pixel circuit will be th There is inhom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G2300/0819G09G2310/0262G09G2320/045G09G3/3233G09G2300/0842G09G2300/0861G09G2310/0251G09G3/3266G09G3/3275G09G2320/0233
Inventor 王志良马占洁
Owner BOE TECH GRP CO LTD
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