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OLED pixel circuit and its driving method, display panel and display device

A technology of a pixel circuit and a driving method, which is applied in the field of liquid crystal display, and can solve problems such as adverse effects on the display effect of an AMOLED display panel, and effects on the light-emitting brightness of a light-emitting device OLED

Active Publication Date: 2017-02-15
BOE TECH GRP CO LTD
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Problems solved by technology

[0006] According to the above formula, the driving current for driving the light-emitting device OLED to emit light is related to the threshold voltage Vth of the driving transistor. Voltage attenuation (IR Drop) occurs during the light-emitting phase, which will affect the light-emitting brightness of the light-emitting device OLED, which will adversely affect the display effect of the AMOLED display panel

Method used

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  • OLED pixel circuit and its driving method, display panel and display device
  • OLED pixel circuit and its driving method, display panel and display device
  • OLED pixel circuit and its driving method, display panel and display device

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Embodiment Construction

[0039] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0040] Please see figure 1 , figure 1A schematic diagram of an OLED pixel circuit provided in an embodiment of the present invention. In this embodiment, the OLED pixel circuit includes a charging control module 1, a driving transistor 2, a reset control module 3, a light emitting control module 4 and a light emitting device 5; wherein, the charging control module 1 is used to provide the OLED pixel circuit with The data line Data of the data signal is connected to the reset control module 3 for introducing the data signal provided by the data line Data into the reset control module 3; the reset control module 3 is connected to the driving transistor 2, It is...

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Abstract

The present invention relates to an OLED pixel circuit and a driving method thereof, a display panel and a display device. The OLED pixel circuit includes a charging control module, a driving transistor, a reset control module, a light-emitting control module and a light-emitting device; the charging control module is connected to the data line and the reset control module, and is used for introducing the data signal provided by the data line to the reset control module module; the reset control module is connected with the driving transistor, and is used for resetting and compensating the driving transistor according to the data signal, so that the control electrode of the driving transistor has a first preset potential; the driving transistor is used for according to the potential of its source and its The first preset potential of the control electrode generates a driving current that makes the light-emitting device emit light; the light-emitting control module is connected between the driving transistor and the light-emitting device, and is used for controlling the connection or disconnection of the driving transistor and the light-emitting device. The above-mentioned OLED pixel circuit can avoid the attenuation of the reference voltage signal and the change of the threshold voltage from affecting the display effect.

Description

technical field [0001] The present invention relates to the technical field of liquid crystal display, in particular to an OLED pixel circuit and a driving method thereof, a display panel and a display device. Background technique [0002] The active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, hereinafter referred to as AMOLED) display panel uses OLED to emit light of different brightness, so that the pixels corresponding to the OLED display have corresponding brightness; compared with the traditional thin film transistor liquid crystal display panel ( Thin Film Transistor Liquid Crystal Display, hereinafter referred to as TFT LCD), AMOLED display panel has faster response speed, higher contrast ratio and wider viewing angle, which is an important development direction of display panel. [0003] The current that drives OLED to emit light can be expressed by the following formula: [0004] [0005] Wherein, Vgs is the voltage differenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
CPCG09G2300/0819G09G2300/0842G09G2300/0852G09G2300/0861G09G3/3233H10K59/1216G09G3/3283
Inventor 永山和由宋松
Owner BOE TECH GRP CO LTD
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