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AC (alternating current)-driven pixel circuit, driving method and display device

A pixel circuit and drive control technology, applied in the field of display devices, can solve the problems of reduced luminous brightness, increased threshold voltage of light-emitting diodes, inability to improve panel display unevenness, etc., so as to eliminate the influence of display unevenness and avoid rapid effects of aging

Active Publication Date: 2014-01-22
BOE TECH GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the prolongation of the use time, and with the prolongation of the OLED use time, a lot of unrecombined carriers accumulated at the internal interface of the light-emitting layer will cause a built-in electric field to form inside the OLED, resulting in a continuous increase in the threshold voltage of the light-emitting diode. The luminous brightness will continue to decrease, and the energy utilization efficiency will also gradually decrease.
The prior art proposes an OLED AC drive circuit. Although this circuit realizes the AC drive of OLED and solves the aging problem of OLED organic light-emitting diodes, it cannot improve the influence of internal resistance and drive transistor threshold on panel display non-uniformity.

Method used

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  • AC (alternating current)-driven pixel circuit, driving method and display device
  • AC (alternating current)-driven pixel circuit, driving method and display device
  • AC (alternating current)-driven pixel circuit, driving method and display device

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Embodiment Construction

[0073] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. .

[0074] The switching transistors and driving transistors used in all embodiments of the present invention can be thin film transistors or field effect transistors or other devices with the same characteristics. Since the source and drain of the switching transistors used here are symmetrical, the source, Drains are interchangeable. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the gate, one pole is called the source, and the other pole is called the drain. According to the form in the accompanying drawings, it is stipulated that the middle terminal of the transistor is the gate, the signal in...

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Abstract

The embodiment of the invention provides an AC (alternating current)-driven pixel circuit, a driving method and a display device, and relates to the field of display manufacturing. The rapid aging of an organic light emitting diode can be effectively avoided, and meanwhile, the influence of the internal resistance of the circuit on a light emitting current and the influence of the threshold voltage of a driving transistor on nonuniformity of panel display can be eliminated. The pixel circuit comprises a capacitor, a first voltage input unit, a second voltage input unit, a data signal input unit, a first light emitting unit, a second light emitting unit and a light emitting control unit. The AC-driven pixel circuit, the driving method and the display device are applied to display manufacturing.

Description

technical field [0001] The invention relates to the field of display manufacturing, in particular to an AC-driven pixel circuit, a driving method and a display device. Background technique [0002] AMOLED (Active Matrix Organic Light Emitting Diode, active matrix organic light emitting diode panel) can emit light by driving TFT (Thin Film Transistor, Thin Film Field Effect Transistor), driven by the current generated in saturation state, because the input same gray scale When the voltage is high, different critical voltages will generate different driving currents, resulting in inconsistencies in the current. The uniformity of Vth (transistor threshold voltage) on the LTPS (Low Temperature Poly-silicon) process is very poor, and Vth also drifts, so the brightness uniformity of traditional 2T1C circuits has always been poor. Another reason that affects brightness uniformity is that due to the internal resistance of the circuit, and OLED is a current-driven light-emitting dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32H01L27/32
CPCG09G2300/0866G09G2320/045G09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2320/043G09G2320/0233G09G2300/0809G09G3/32G09G3/3225
Inventor 青海刚祁小敬
Owner BOE TECH GRP CO LTD
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