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Pixel circuit, driving method thereof, and display device

A pixel circuit and circuit technology, applied in static indicators, instruments, etc., can solve the problems of poor display effect of display devices, drift of threshold voltage of driving transistors, different threshold voltages, etc., and achieve the effect of improving display effect

Active Publication Date: 2019-03-29
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a pixel circuit, a driving method thereof, and a display device, which can solve the problem in the related art that the threshold voltages of the driving transistors are different between different pixel units, or the threshold voltages of the driving transistors drift with time. less effective problem

Method used

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  • Pixel circuit, driving method thereof, and display device
  • Pixel circuit, driving method thereof, and display device
  • Pixel circuit, driving method thereof, and display device

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The transistors used in all the embodiments of the present invention can be field effect transistors or other devices with the same characteristics, and the transistors used in the embodiments of the present invention are mainly switching transistors according to their functions in circuits. Since the source and drain of the switching transistor used here are symmetrical, the source and drain are interchangeable. In the embodiments of the present invention, the source is called the first pole, and the drain is called the second pole. According to the form in the accompanying drawings, it is stipulated that the middle terminal of the transistor is the gate, the signal input terminal is the source terminal, and the signal output ter...

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Abstract

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.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] Active matrix organic light emitting diode (AMOLED), as a current-mode light-emitting device, has become more and more popular due to its characteristics of self-luminescence, fast response, wide viewing angle and the ability to be fabricated on flexible substrates. It is widely used in the field of high-performance display. [0003] In an AMOLED display device, each pixel unit includes an AMOLED and a pixel circuit, and the pixel circuit can provide a driving current to the AMOLED to drive the AMOLED to emit light. The pixel circuit generally includes: a driving transistor, a switching transistor and a capacitor. The switching transistor can output the data voltage provided by the data signal terminal to the driving transistor, and the driving transistor can convert the data...

Claims

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Application Information

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IPC IPC(8): G09G3/3233
CPCG09G3/3233G09G3/3275G09G2320/0233G09G2310/08G09G2320/0295G09G2320/045G09G2300/0842G09G2300/0426G09G2330/02
Inventor 徐攀林奕呈王国英王玲
Owner BOE TECH GRP CO LTD
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