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AMOLED pixel drive circuit, drive method and array drive system

A pixel drive circuit and drive transistor technology, applied in circuits, electrical components, electric solid-state devices, etc., can solve the problems of small relative aperture and low luminous efficiency, and achieve the effect of improving relative aperture, high luminous efficiency, and simple driving method

Active Publication Date: 2014-03-26
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an AMOLED pixel drive circuit, a drive method and an array drive system, which are used to solve the problem of small relative aperture due to the existence of capacitance in the AMOLED drive circuit in the prior art. Problems such as low luminous efficiency

Method used

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  • AMOLED pixel drive circuit, drive method and array drive system
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  • AMOLED pixel drive circuit, drive method and array drive system

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Embodiment 1

[0066] Such as Figure 2 ~ Figure 4 As shown, the present embodiment provides an AMOLED pixel driving circuit, and the driving circuit includes:

[0067] The first transistor T1, the second transistor T2, the organic light emitting diode D1 and the driving transistor T3, the driving transistor T3 includes a control gate and a semi-floating gate, and its threshold voltage is adjustable;

[0068] The gate of the first transistor T1 is connected to the first scanning signal Vsc1, the first electrode is connected to the gate voltage signal Vg, and the second electrode is connected to the control gate of the driving transistor T3; the source of the driving transistor T3 is grounded, and the drain is grounded. Connect the first pole of the organic light emitting diode D1; the second pole of the organic light emitting diode D1 is connected to the external power supply ELVDD; the gate of the second transistor T2 is connected to the second scanning signal Vsc2, and the first electrode ...

Embodiment 2

[0098] Such as Figure 5 As shown, the present embodiment provides an AMOLED pixel array drive system, including:

[0099] A data signal driving circuit, used to generate a data signal Vd;

[0100] A scanning circuit, configured to generate a first scanning signal Vsc1 and a second scanning signal Vsc2;

[0101] The pixel array is formed by a plurality of AMOLED pixel drive circuits arranged in a matrix. The basic structure of the AMOLED pixel drive circuit is as in Embodiment 1, wherein the plurality of pixel drive circuits share the same external power supply, gate voltage signal Vg and ground The pixel driving circuits in each row share the first scanning signal Vsc1 and the second scanning signal Vsc2, and the pixel driving circuits in each column share the data signal Vd.

[0102] Such as Figure 6 As shown, this embodiment also provides a driving method for an AMOLED pixel array driving system, still taking the first transistor T1 and the second transistor T2 as N-typ...

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Abstract

The invention provides an AMOLED pixel drive circuit, a drive method and an array drive system. The AMOLED pixel drive circuit comprises a first transistor, a second transistor, an organic light emitting diode and a drive transistor, wherein a threshold voltage of the drive transistor can be adjusted. The grid of the first transistor is connected with a first scanning signal, the first electrode of the first transistor is connected with a grid voltage signal, and the second electrode of the first transistor is connected with a control grid of the drive transistor. The source of the drive transistor is connected to the ground, and the drain of the drive transistor is connected with the first pole of the organic light emitting diode. The second pole of the organic light emitting diode is connected with an external power source. The grid of the second transistor is connected with a second scanning signal, the first electrode of the second transistor is connected with a data signal, and the second electrode of the second transistor is connected with the first pole of the organic light emitting diode. According to the AMOLED pixel drive circuit, a traditional capacitor and a PMOS transistor are replaced by the drive transistor with the adjustable threshold voltage. Therefore, the relative aperture of pixel structures is greatly improved, and light-emitting efficiency of the pixel structures is greatly improved.

Description

technical field [0001] The invention relates to a pixel driving technology of an OLED display, in particular to an AMOLED pixel driving circuit, a driving method and an array driving system. Background technique [0002] In recent years, active-matrix organic light-emitting diodes (AMOLED), compared with traditional passive-driven organic light-emitting diodes (PMOLED), have the advantages of fast response time, high contrast, and large viewing angle, and have become the next generation display technology. strong competitors in the field. [0003] The most basic light-emitting pixel structure of AMOLED is 2T1C structure, which is composed of switching transistor T1, driving transistor T2, capacitor C1 and organic light-emitting diode D1, such as figure 1 shown. The gate of the switching transistor T1 is connected to the scan signal Vscan, the doped drain region is connected to the data signal Vdata, and the doped source region is connected to the gate of the driving transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/32G09G3/32G09G3/3233
Inventor 汪辉丁毅岭方娜汪宁章琦田犁封松林
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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