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1. CN109545145 - Pixel circuit, driving method thereof, and display device

Office
China
Application Number 201910002345.3
Application Date 02.01.2019
Publication Number 109545145
Publication Date 29.03.2019
Grant Number 109545145
Grant Date 28.07.2020
Publication Kind B
IPC
G09G 3/3233
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
22using controlled light sources
30using electroluminescent panels
32semiconductive, e.g. using light-emitting diodes
3208organic, e.g. using organic light-emitting diodes
3225using an active matrix
3233with pixel circuitry controlling the current through the light-emitting element
CPC
G09G 3/3233
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
22using controlled light sources
30using electroluminescent panels
32semiconductive, e.g. using light-emitting diodes [LED]
3208organic, e.g. using organic light-emitting diodes [OLED]
3225using an active matrix
3233with pixel circuitry controlling the current through the light-emitting element
G09G 3/3275
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
22using controlled light sources
30using electroluminescent panels
32semiconductive, e.g. using light-emitting diodes [LED]
3208organic, e.g. using organic light-emitting diodes [OLED]
3275Details of drivers for data electrodes
G09G 2300/0842
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2300Aspects of the constitution of display devices
08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
0809Several active elements per pixel in active matrix panels
0842forming a memory circuit, e.g. a dynamic memory with one capacitor
G09G 2310/08
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
08Details of timing specific for flat panels, other than clock recovery
G09G 2320/0233
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0233Improving the luminance or brightness uniformity across the screen
G09G 2320/0295
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
029by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
0295by monitoring each display pixel
Applicants BOE TECHNOLOGY GROUP CO., LTD.
京东方科技集团股份有限公司
Inventors XU PAN
徐攀
LIN YICHENG
林奕呈
WANG GUOYING
王国英
WANG LING
王玲
Agents 北京三高永信知识产权代理有限责任公司 11138
Title
(EN) Pixel circuit, driving method thereof, and display device
(ZH) 像素电路及其驱动方法、显示装置
Abstract
(EN)
The invention discloses a pixel circuit, a driving method thereof, and a display device, and belongs to the technical field of display. The pixel circuit includes a compensation sub-circuit, a regulation sub-circuit, and a detection sub-circuit. Since the compensation sub-circuit can output a first power signal to a first node, the adjustment sub-circuit can adjust the potential of a second node according to the potential of the first node. Therefore, a drive current outputted to a light-emitting unit can be enabled to be independent of a threshold voltage of a driving transistor, i.e., achieving the internal compensation of the threshold voltage of the drive transistor. Since the detection sub-circuit can output the potential of the second node to a detection signal line connected to an external compensation circuit, the external compensation circuit can adjust the data signal voltage according to the voltage of the light-emitting unit, i.e., achieving external compensation of the threshold voltage of the driving transistor. The problem that the difference of the driving currents flowing through the respective light-emitting units due to the threshold voltage of the driving transistor causes the non-uniform display brightness of a display device is solved.

(ZH)
本发明公开了一种像素电路及其驱动方法、显示装置,属于显示技术领域。像素电路包括补偿子电路、调节子电路和检测子电路。由于补偿子电路可以向第一节点输出第一电源信号,调节子电路可以根据第一节点的电位调节第二节点的电位。因此可以使得输出至发光单元的驱动电流与驱动晶体管的阈值电压无关,即实现对驱动晶体管阈值电压的内部补偿。由于检测子电路可以向与外部补偿电路连接的检测信号线输出第二节点的电位,因此可以使得外部补偿电路根据发光单元电压调整数据信号电压,即实现对驱动晶体管阈值电压的外部补偿。解决了由于驱动晶体管的阈值电压而造成流过各发光单元的驱动电流存在差异,显示装置显示亮度不均匀的问题。

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