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A pixel circuit, its driving method and related device

A technology for pixel circuits and driving transistors, applied in circuits, electrical components, electrical solid devices, etc., can solve problems such as uneven image brightness, and achieve the effect of improving uniformity

Active Publication Date: 2017-04-19
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This causes the current flowing through each OLED to vary with the threshold voltage V of the drive transistor th and the source voltage VDD of the drive transistor vary, resulting in uneven brightness of the image

Method used

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

Examples

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Effect test

example 1

[0074] by Figure 3c The structure of the pixel circuit shown is taken as an example to describe its working process, in which Figure 3c In the pixel circuit shown, the driving transistor is a P-type transistor, and all switching transistors are P-type transistors. Each P-type 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 4a shown. Specifically, choose the Figure 4a Two stages T1 and T2 are shown in the input timing diagram.

[0075] In the T1 stage, G1=0, EM=1. The first switch transistor T1 and the second switch transistor T2 are in an on state, the third switch transistor T3 forms a diode structure, and the fourth switch transistor T4 and the fifth switch transistor T5 are in an off state. Since the first switch transistor T1 is turned on, the voltage of the first node A is the voltage V of the data signal Data Data , since the second switch transis...

example 2

[0078] by Figure 3d The structure of the pixel circuit shown is taken as an example to describe its working process, in which Figure 3d In the pixel circuit shown, the driving transistor and the third switching transistor are P-type transistors, and the other switching transistors are N-type transistors, and each N-type transistor is turned on under the action of a high level, and is turned off under the action of a low level; corresponding The input timing diagram of Figure 4b shown. Specifically, choose the Figure 4b Two stages T1 and T2 are shown in the input timing diagram.

[0079] In the T1 stage, G1=1, EM=0. The first switch transistor T1 and the second switch transistor T2 are in an on state, the third switch transistor T3 forms a diode structure, and the fourth switch transistor T4 and the fifth switch transistor T5 are in an off state. Since the first switch transistor T1 is turned on, the voltage of the first node A is the voltage V of the data signal Data ...

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Abstract

The invention discloses a pixel circuit, its driving method and related devices. The pixel circuit includes: a driving transistor, a capacitor connected between the source and the gate of the driving transistor, a light emitting device, a light emitting control module, a data writing module and compensation module. Through the cooperative work of the above-mentioned modules, the pixel circuit can compensate the drift of the threshold voltage of the driving transistor. Therefore, when the light is displayed, the driving current of the driving transistor to drive the light-emitting device to emit light is only related to the voltage of the data signal and the reference voltage. Regardless of the threshold voltage of the driving transistor and the first reference voltage source, the influence of the threshold voltage and IR Drop on the current flowing through the light-emitting device can be avoided, so that the operating current for driving the light-emitting device to emit light remains consistent, and the image brightness of the display area of ​​the display device is improved. uniformity.

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescence, in particular to a pixel circuit, its driving method and related devices. 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] Unlike LCD, which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission. Due to reasons such as process technology and device agi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208H01L27/32
CPCG09G3/3233G09G3/3291G09G2300/0819G09G2320/0233G09G2320/045G09G2320/0626H10K59/131H10K59/1213H10K59/1216G09G3/3258
Inventor 马占洁
Owner BOE TECH GRP CO LTD
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