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Driving method of pixel circuit

A technology of a pixel circuit and a driving method, applied in the field of organic light-emitting display devices, can solve the problems of uneven light-emitting brightness, poor black display effect, etc., and achieve uniform brightness, better display effect, and the effect of realizing voltage drop compensation.

Active Publication Date: 2020-08-18
TRULY HUIZHOU SMART DISPLAY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In AMOLED, a constant current is generated by voltage-controlled thin-film transistor (TFT, Thin Film Transistor) to drive OLED (Organic Light-Emitting Diode, organic light-emitting diode) to emit light, and the drive transistor (DTFT, Drive Thin Film Transistor) works in the saturation region. Since the threshold voltage (Vth) of the DTFT at each position of the panel is not equal, the same grayscale voltage is supplied to the pixel circuit, and different currents will be generated in each pixel circuit, resulting in uneven luminous brightness and poor black display effect. , there is also a voltage drop (IRDrop) of the trace of the voltage source ELVDD

Method used

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Embodiment Construction

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of th...

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Abstract

The invention relates to an organic light-emitting display device as well as a pixel circuit and a driving method thereof. The pixel circuit comprises a first transistor, a second transistor, a thirdtransistor, a fourth transistor, a fifth transistor, a drive transistor and a memory capacitor. The organic light-emitting display device as well as the pixel circuit and the driving method thereof can realize threshold voltage compensation and voltage drop compensation so as to enable the luminance of light emitting display to be uniform; furthermore, by reversely resetting an electroluminescentdevice, the display effect of black is enabled to be better.

Description

technical field [0001] The present invention relates to the technical field of light emitting display, in particular to an organic light emitting display device, a pixel circuit and a driving method thereof. Background technique [0002] AMOLED (Active Matrix / Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) is a self-luminous display device, which has the advantages of high contrast, fast response, and low power consumption. [0003] In AMOLED, a constant current is generated by voltage-controlled thin-film transistor (TFT, Thin Film Transistor) to drive OLED (Organic Light-Emitting Diode, organic light-emitting diode) to emit light, and the drive transistor (DTFT, Drive Thin Film Transistor) works in the saturation region. Since the threshold voltage (Vth) of the DTFT at each position of the panel is not equal, the same grayscale voltage is supplied to the pixel circuit, and different currents will be generated in each pixel circuit, resulting in un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
CPCG09G3/3233
Inventor 吴锦坤胡中艺胡君文苏君海李建华
Owner TRULY HUIZHOU SMART DISPLAY
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