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Pixel circuit and driving method thereof and display substrate

A pixel circuit and drive transistor technology, applied in static indicators, instruments, etc., can solve the problem of not being able to balance high brightness and high contrast

Active Publication Date: 2018-12-14
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention at least partly solves the problem that high brightness and high contrast cannot be taken into account when driving the existing organic light-emitting diode pixel circuit, and provides a pixel circuit and its driving method, and a display substrate

Method used

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  • Pixel circuit and driving method thereof and display substrate
  • Pixel circuit and driving method thereof and display substrate

Examples

Experimental program
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Embodiment 1

[0041] This embodiment provides a pixel circuit, such as figure 1As shown, it includes a first drive transistor M4, a second drive transistor M7, and an organic light emitting diode D1; the gate of the first drive transistor M4 is connected to the first data terminal VdataA, the first pole is connected to the first power supply terminal VDD1, and the second pole is connected to The first pole of the organic light emitting diode D1; the gate of the second driving transistor M7 is connected to the second data terminal VdataB, the first pole is connected to the second power supply terminal VDD2, and the second pole is connected to the second pole of the organic light emitting diode D1.

[0042] That is, the voltage signal of the first data terminal VdataA controls the continuity between the first pole and the second pole (that is, the gate and source poles) of the first driving transistor M4, and the voltage signal of the second data terminal VdataB controls the second driving tra...

Embodiment 2

[0065] This embodiment provides a method for driving a pixel circuit, which is applied to the pixel circuit provided in Embodiment 1 of the present invention. The driving method includes: providing a first voltage to a first power supply terminal, and providing a second voltage to a second power supply terminal; In the light emitting phase P3, the first data voltage is provided to the gate of the first driving transistor M4, and the second data voltage is provided to the gate of the second driving transistor M7.

[0066] According to the foregoing analysis, it is known that as long as the difference between the first voltage and the second voltage is large enough, since the two drive transistors (the first drive transistor M4 and the second drive transistor M7) jointly control the voltage of the cathode and anode of the organic light emitting diode D1, then The variation range of the voltage difference between the two ends of the organic light emitting diode D1 can be increased...

Embodiment 3

[0080] This embodiment provides a display substrate, including a plurality of pixel circuits, and the pixel circuits are the pixel circuits provided according to Embodiment 1.

[0081] That is to say, the pixel circuit provided in Embodiment 1 is arranged in the display substrate, and corresponding data lines are provided for each data terminal, so as to receive an external driving voltage.

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Abstract

The invention provides a pixel circuit and a driving method thereof and a display substrate, belongs to the technical field of display, and can at least partially solve the problems in the prior art that two modes of high brightness and high contrast cannot be taken into account when driving an organic light emitting diode pixel circuit. The pixel circuit comprises a first driving transistor, a second driving transistor and an organic light emitting diode. The gate electrode of the first driving transistor is connected with a first data end, the first electrode is connected with a first powersupply end and the second electrode is connected with the first electrode of the organic light emitting diode. The gate electrode of the second driving transistor is connected with a second data end,the first electrode is connected with a second power supply end and the second electrode is connected with the second electrode of the organic light emitting diode.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a pixel circuit, a driving method for the pixel circuit and a display substrate. Background technique [0002] In existing pixel circuits in OLED display panels, driving transistors (such as silicon-based driving transistors) are generally used to drive the OLEDs to emit light. The simplest circuit can be understood as that the drive transistor and the organic light emitting diode are connected in series between the power supply and the ground (taking the anode of the organic light emitting diode connected to the drive transistor and the cathode ground as an example), the two are equivalent to two resistors, of which the drive transistor The equivalent resistance is variable, so the divided voltage can be changed by adjusting the equivalent resistance of the driving transistor, that is, changing the anode voltage of the OLED, wherein the resistance of the driving tra...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
CPCG09G3/3208
Inventor 丛宁杨盛际杨明玄明花岳晗张粲王灿陈亮赵德涛王磊陈小川
Owner BOE TECH GRP CO LTD