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A pixel circuit and its driving method

A technology of a pixel circuit and a driving method, applied in the display field, can solve the problems of non-uniformity of electrical performance and uneven film thickness of light-emitting devices, and achieve the effects of eliminating uneven film thickness, improving quality, and improving compensation effect.

Active Publication Date: 2017-05-03
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Third, the uneven film thickness of the light-emitting device will also cause non-uniformity in electrical properties during evaporation

Method used

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  • A pixel circuit and its driving method
  • A pixel circuit and its driving method
  • A pixel circuit and its driving method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 As shown, the pixel circuit described in the embodiment of the present invention is mainly used for the driving compensation of each light-emitting device in the active matrix light-emitting organic electric display tube. Each light-emitting device is driven and compensated by a pixel circuit, and each pixel circuit includes: Subcircuits, charging subcircuits, driving subcircuits and light emitting devices; wherein,

[0043] The first terminal of the light emitting device OLED is connected to the second voltage terminal ELVSS;

[0044] The driving sub-circuit includes a driving transistor DTFT, a first transistor T1, a third transistor T3, a first storage capacitor Cs, and a second storage capacitor Cb, and the source of the driving transistor DTFT is connected to the drain of the first transistor T1 and the drain of the third transistor T3, the drain of the driving transistor DTFT is connected to the second terminal of the light emitting device OLED, the ...

Embodiment 2

[0066] The pixel circuit and driving method in this embodiment are improvements on the basis of Embodiment 1. The technical content disclosed in Embodiment 1 will not be described repeatedly, and the content disclosed in Embodiment 1 also belongs to the content disclosed in this embodiment.

[0067] see Figure 4 As shown, as a modified technical solution of the technical solution in Embodiment 1; the pixel circuit also includes a third scanning signal line Scan3; specifically: the charging sub-circuit includes a fifth transistor T5 and a sixth transistor T6, so The source of the fifth transistor T5 is connected to the data voltage input terminal DATA, the drain of the fifth transistor T5 is connected to the source of the fourth transistor T4, and the gate of the fifth transistor T5 is connected to the second scanning signal line Scan2; the gate of the sixth transistor T6 and the source of the sixth transistor T6 are connected to the third scanning signal line Scan3, and the d...

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Abstract

The invention relates to the technical field of display, in particular to a pixel circuit and a driving method of the pixel circuit. The pixel circuit comprises a driving sub-circuit, a reset sub-circuit and a charging sub-circuit, wherein the driving sub-circuit comprises a driving transistor, a first transistor, a third transistor, a first storage capacitor and a second storage capacitor; the reset sub-circuit is used for discharging the first storage capacitor and the second storage capacitor under the control of a first scanning signal output from a first scanning signal line; the charging sub-circuit comprises a fifth transistor and a sixth transistor. According to the pixel circuit, heterogeneity caused by the threshold voltage of the driving transistor and the ghost shadow phenomenon caused by threshold voltage drifting can be effectively eliminated through compensation; the problem that the brightness of an active matrix light-emitting organic electrical display tube is not uniform because light-emitting devices of different pixel units in the active matrix light-emitting organic electrical display tube are different in threshold voltage of the driving transistor is avoided.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit and a driving method thereof. Background technique [0002] Organic Light-Emitting Diode (OLED, Organic Light-Emitting Diode), as a current-mode light-emitting device, has been increasingly used in high-performance active-matrix light-emitting OLEDs. Traditional passive matrix organic electroluminescent display tubes (Passive Matrix OLED) require a shorter driving time of a single pixel as the display size increases, thus requiring an increase in transient current and power consumption. At the same time, the application of high current will cause the voltage drop on the nano-indium tin metal oxide line to be too large, and the working voltage of the OLED will be too high, thereby reducing its efficiency. However, an active matrix organic electroluminescent display tube (AMOLED, Active Matrix OLED) scans input OLED current row by row through switching tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233G09G3/3225
Inventor 杨飞
Owner BOE TECH GRP CO LTD
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