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Pixel circuit, driving method thereof and display device

A technology for pixel circuits and drive transistors, applied in circuits, electrical components, and electric solid-state devices, can solve problems such as short light-emitting time and long programming time, and achieve the effects of simple structure, fewer control lines, and compensation for inhomogeneity

Active Publication Date: 2015-08-05
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this driving method, the control lines of all pixel circuits on the panel are shared (that is, global control lines are used). However, since there is a large amount of waiting idle time in each row during the programming phase, the overall programming time is longer and the lighting time is shorter. short

Method used

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  • Pixel circuit, driving method thereof and display device
  • Pixel circuit, driving method thereof and display device
  • Pixel circuit, driving method thereof and display device

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Please refer to Figure 3a and Figure 3b , which is a structural diagram of a pixel circuit disclosed in this embodiment, including: a driving transistor T1 and a light emitting element OLED connected in series between the first level terminal VDD and the second level terminal VSS, and the second transistor T2, the third The transistor T3, the fourth transistor T4, the first capacitor C1 and the second capacitor C2. in, Figure 3a In the pixel circuit shown, each transistor (driving transistor T1, second transistor T2, third transistor T3 and fourth transistor T4) is an N-type thin film transistor; Figure 3b In the pixel circuit shown, each transistor (driving transistor T1 , second transistor T2 , third transistor T3 and fourth transistor T4 ) is a P-type thin film transistor.

[0038] The first pole of the driving transistor T1 is connected to the second pole of the third transistor T3 to form the first node A; the second pole of the driving transistor T1 is conn...

Embodiment 2

[0055] Please refer to Figure 5a and Figure 5b , is a structure diagram of a pixel circuit disclosed in this embodiment. The difference from the above-mentioned embodiments is that the pixel circuit disclosed in this embodiment further includes: a fifth transistor T5 providing a reference level V to the third node C ref transmitted by the fifth transistor T5.

[0056] The first pole of the fifth transistor T5 is used to input the reference level V ref , the second pole of the fifth transistor T5 is connected to the third node C, and the control pole of the fifth transistor T5 is used to input the first control signal V CM . In one example, please refer to Figure 5a , each transistor is an N-type transistor, the active level of each transistor is high level, the dark data voltage is low level, the initialization potential of the first node A and the second node B is provided by the first level terminal VDD; For another example, please refer to Figure 5b Each transisto...

Embodiment 3

[0060] Please refer to Figure 6a and Figure 6b , is a schematic diagram of a pixel circuit structure disclosed in this embodiment. In the above embodiment, one end of the second capacitor C2 is directly connected to the control electrode of the driving transistor T1. In this embodiment, the second capacitor C2 is indirectly connected. connected to the control electrode of the drive transistor T1, and one end of the second capacitor C2 connected to the control electrode of the drive transistor T1 is connected to the third node C, through the coupling effect of the first capacitor C1, the end of the second capacitor C2 is connected to the drive transistor The control pole of T1 is electrically connected. In the pixel circuit disclosed in this embodiment, the connection manners of other components are the same as those in the above embodiments, and will not be repeated here.

[0061] Figure 6a In the pixel circuit shown, each transistor (driving transistor T1, second transi...

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Abstract

The invention provides a pixel circuit. The pixel circuit includes a driving transistor and a light-emitting element which are connected in series between a first electric level end and a second electric level end, and as well a second transistor, a third transistor, a fourth transistor, a first capacitor and a second capacitor, wherein the second capacitor is connected between the control pole of the driving transistor and the second end of the light-emitting element. Threshold voltage is stored through the first capacitor, so that threshold voltage compensation of the driving transistor and the light-emitting element can be realized, and therefore, the nonuniformity of the display of the pixel circuit can be compensated. According to the above pixel circuit, the invention also provides a display device. According to the display device, a first control line and a light-emitting control line are both global lines. The invention further discloses a pixel circuit driving method.

Description

technical field [0001] The invention relates to the field of display devices, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] Due to the advantages of high brightness, high luminous efficiency, wide viewing angle and low power consumption, Organic Light-Emitting Diode (OLED) display has been extensively studied in recent years and has been rapidly applied to a new generation of displays. The OLED display can be driven in two ways: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED). Although the cost of passive matrix driving is low, it cannot realize high-resolution display due to crosstalk phenomenon, and the passive matrix driving current is large, which reduces the service life of OLED. In contrast, the active matrix OLED driving method sets a different number of transistors as current sources on each pixel, avoids crosstalk, requires less driving current, and lower power consumption, which increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32H01L27/32
CPCG09G2300/0861G09G2310/0262G09G3/3233H10K59/805H10K59/80518G09G3/32H10K50/805G09G3/3258G09G2310/0264
Inventor 张盛东孟雪冷传利
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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