Pixel circuit, driving method of pixel circuit and organic electroluminescence display panel

A technology of pixel circuit and lighting control, which is applied in static indicators, instruments, etc., can solve the problem of inconsistent brightness of the first frame, and achieve the effect of avoiding inconsistent threshold capture, consistent brightness, and preventing afterimage phenomenon

Active Publication Date: 2017-10-20
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a pixel circuit, its driving method, and an organic electroluminescence display panel, which are used to improve the afterimage existing in the existing pixel circuit and the problem of inconsistency in brightness of the first frame after switching between high and low gray scales.

Method used

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  • Pixel circuit, driving method of pixel circuit and organic electroluminescence display panel
  • Pixel circuit, driving method of pixel circuit and organic electroluminescence display panel
  • Pixel circuit, driving method of pixel circuit and organic electroluminescence display panel

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Embodiment Construction

[0029] by right figure 1 The pixel circuit of the pixel circuit is simulated. When the n-1th frame is 0 grayscale, the nth frame is 255 grayscale, and the n+1th frame is 255 grayscale, the first node N1 and N2 nodes in different time periods When the potential was detected, the detection results are shown in Table 1 below.

[0030]

[0031] Table 1

[0032] It can be seen from Table 1 above that the potential of the second node N2 in the nth frame of the initialization phase is different from the potential of the second node N2 in the n+1th frame. This is because during the initialization phase, the potential -3V of the first node N1 in the nth frame is switched from 3.44V, and the potential -3V of the first node N1 in the n+1th frame is switched from 1.5V , because there is a parasitic capacitance between the first node N1 and the second node N2 in the pixel circuit, and the second node N2 is in a floating state during the initialization phase, the inconsistent voltage c...

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Abstract

The invention discloses a pixel circuit, a driving method of the pixel circuit and an organic electroluminescence display panel. A first node and a second node are reset in the initialization phase through a first switching transistor and a seventh switching transistor included in a node initialization module so that the difference caused by parasitic capacitance of the two nodes can be avoided. The gate electrode of a driving transistor is electrically connected with the first node. The source electrode of the driving transistor is electrically connected with the second node. The driving transistor is reset in the initialization phase so that the problem of threshold grabbing inconsistency caused by voltage jump can be avoided, and the brightness of the first frame after high and low grayscale switching is ensured to be consistent. Besides, the driving transistor is completely reset in the initialization phase of each frame so that the ghost phenomenon caused by deviation of the threshold voltage of the driving transistor can be prevented.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, its driving method and an organic electroluminescent display panel. 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 displays, OLED has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. , OLEDs have begun to replace traditional Liquid Crystal Displays (LCDs) in the field of flat panel displays such as mobile phones, PDAs, and digital cameras. Among them, pixel circuit design is the core technical content of OLED display, which has important research significance. [0003] The structure of an existing pixel circuit is as follows figure 1 as shown, figure 1 It is a structure diagram of an existing pixel circuit, including 6 switching transistors: T1-T6, 1 driving tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G3/3233G09G2300/0426G09G2300/0842G09G2300/0861G09G2300/0866G09G2310/08G09G2300/0819G09G2320/0214G09G2320/0219G09G2320/0233G09G2320/0257G09G2320/045G09G3/3225
Inventor 高娅娜朱仁远李玥向东旭陈泽源
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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