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Pixel circuit, driving method thereof and relevant apparatus

A pixel circuit and drive transistor technology, applied in static indicators, instruments, etc., can solve problems such as uneven brightness, uneven display brightness, and current differences in different display areas

Active Publication Date: 2017-01-04
BOE TECH GRP CO LTD +1
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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, resulting in uneven display brightness, resulting in current differences in different display areas, resulting in uneven brightness of OLEDs in different display areas

Method used

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  • Pixel circuit, driving method thereof and relevant apparatus
  • Pixel circuit, driving method thereof and relevant apparatus
  • Pixel circuit, driving method thereof and relevant apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0098] Such as Figure 2a As shown, the driving transistor M0 is a P-type transistor, and its threshold voltage V th Negative value, all switching transistors are P-type transistors; each switching transistor is cut off under the action of high potential, and turned on under the action of low potential; the first power supply terminal VG1 is positive, which means high potential, and the second power supply terminal VG2 is grounded That is, low potential; the corresponding input timing diagram is as follows Figure 4a shown. Specifically, choose the Figure 4a The three stages T1, T2 and T3 in the input timing diagram are shown.

[0099] In the T1 stage, Scan=1, EM=0. The equivalent circuit diagram is as Figure 5a shown.

[0100] Since Scan=1, both the first switch transistor M1 and the second switch transistor M2 are turned off; since EM=0, both the third switch transistor M3 and the fourth switch transistor M4 are turned on. The turned-on fourth switch transistor M4 t...

Embodiment 2

[0107] Such as Figure 3a As shown, the driving transistor M0 is an N-type transistor, and its threshold voltage V th is a positive value, all switching transistors are N-type transistors; each switching transistor is cut off under the action of a high potential, and is turned on under the action of a low potential; the first power supply terminal VG1 is grounded to be a low potential, and the second power supply terminal VG2 is a positive value That is, high potential; the corresponding input timing diagram is as follows Figure 4b shown. Specifically, choose the Figure 4b The three stages T1, T2 and T3 in the input timing diagram are shown.

[0108] In the T1 stage, Scan=0, EM=1. The equivalent circuit diagram is as Figure 6a shown.

[0109] Since Scan=0, both the first switch transistor M1 and the second switch transistor M2 are turned off; since EM=1, both the third switch transistor M3 and the fourth switch transistor M4 are turned on. The turned-on fourth switch...

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PUM

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Abstract

The invention discloses a pixel circuit, a driving method thereof, an organic electroluminescence display panel and a display device, comprising a data write-in module, a reset module, a first storing module, a second storing module, a light emission control module, a driving transistor and a light emitting device. For the cooperation of the above five modules, the working current of the light emitting device driven by the driving transistor in the pixel circuit can be made relevant only to the voltage of the data signal terminal and the voltage of the reference signal terminal, irrespective of the threshold voltage of the driving transistor. This can avoid the effect of the threshold voltage of the driving transistor on the working current across the light emitting device, thereby stabilizing the working current for driving the light emitting device and improving the brightness uniformity of the display area in the display panel.

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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IPC IPC(8): G09G3/3225G09G3/3233
CPCG09G3/3225G09G3/3233G09G3/3291G09G3/3266G09G2300/0852G09G2300/0819G09G2300/0861G09G2310/0251G09G3/3258
Inventor 青海刚
Owner BOE TECH GRP CO LTD
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