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A pixel circuit and its driving method and application

A technology of a pixel circuit and a driving method, applied in the field of display devices applying the pixel circuit, can solve the problems of inconsistent brightness of organic light emitting diodes, affecting the display effect of an active matrix organic light emitting display device, and inconsistent current of organic light emitting diodes, etc.

Active Publication Date: 2018-05-25
CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] although figure 1 The traditional active matrix organic light emitting display device has the advantage of low power consumption, but due to the manufacturing process of thin film transistors, it is difficult to make all the thin film transistors in the active matrix organic light emitting display device have the same carrier mobility In particular, the carrier mobility of the driving transistors in different pixel units is different, so that when the same gate driving voltage is applied, the current flowing through the organic light-emitting diodes is inconsistent, resulting in inconsistent brightness of the organic light-emitting diodes in different pixel units; When the pixel unit responds to the same data signal, it produces light with different brightness, which seriously affects the display effect of the active matrix organic light-emitting display device.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0049] This embodiment provides a pixel circuit and its driving method, such as Figure 5 As shown, the pixel circuit is electrically connected to the data driver 130 through the data line Dm, and electrically connected to the scan driver 120 through the scan line Sni (i is 1, 2, 3); The initialization stage t1 of the control signal is initialized, the data model provided from the data line Dm is accepted in the programming stage t2, and the image is displayed by emitting light with a brightness corresponding to the data signal in the light-emitting stage t3; in the light-emitting stage t3, the scanning line Sni After being supplied, the scanning control signal transitions to an appropriate level, so as to supply current to the organic light emitting diodes provided in each pixel unit 110 .

[0050] Such as figure 2 As shown, each pixel circuit further includes a first power supply ELVDD and a second power supply ELVSS connected externally, and the first power supply ELVDD a...

Embodiment 2

[0072] This embodiment provides a pixel circuit and its driving method, such as image 3 As shown, the pixel circuit and its driving method are the same as the first embodiment, the only difference is that the second capacitor C2 is electrically connected between the source of the fifth transistor T5 and the drain of the first transistor T1.

[0073] The plate of the second capacitor C2 electrically connected to the first transistor T1 is electrically connected to the second node N2, and the first capacitor C1 and the second capacitor C2 can simultaneously play the role of negative feedback of the anode voltage of the organic light emitting diode OLED, therefore, the The voltage fed back by the anode of the organic light emitting diode OLED is multiplied by the factor C1 / (C1+C2), so that the voltage fed back by the anode of the organic light emitting diode OLED can be controlled by setting the capacitance value of the second capacitor C2, which can be more The current flowing ...

Embodiment 3

[0075] This embodiment provides an active matrix organic light-emitting display device using the pixel circuit described in Embodiment 1, such as Figure 5 As shown, the active matrix organic light emitting display device in this embodiment includes: several pixel units 110 , a scan driver 120 and a data driver 130 . The pixel units 110 are arranged in a matrix at the intersection of the scan lines Sni and the data lines Dm, and are electrically connected to the data driver 130 through the data lines Dm, and electrically connected to the scan driver 120 through the scan lines Sni.

[0076] Each pixel unit 110 is initialized at the initialization stage t1 when the scan line Sni provides the scan control signal, and the pixel unit 110 receives the data signal provided from the data line Dm at the programming stage t2 when the scan control signal is provided by the scan line Sni; In the light-emitting phase t3, the scanning control signal provided by the scanning line Sn transiti...

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Abstract

In the pixel circuit and its driving method according to the present invention, a first capacitor is electrically connected between the anode of the organic light emitting diode and the gate of the driving transistor; when each pixel circuit responds to the same data signal, each pixel circuit The carrier mobility of the drive transistor is not the same, resulting in the current flowing through the organic light-emitting diode is not the same, affecting the uniformity of the brightness of each pixel unit; the voltage change is fed back to the drive transistor through the first capacitor connected in parallel with the drive transistor Since all transistors are field effect transistors with the same channel polarity, they can play the role of negative feedback to adjust the current flowing into the anode of the organic light emitting diode, so that the current compensation flowing through the organic light emitting diode in each pixel is consistent, effectively solving the problem. The unevenness of the organic light emitting diode caused by the difference in carrier mobility affects the display effect of the organic light emitting display device to which it is applied.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit capable of effectively improving the response characteristics of a display device and displaying uniform pixel quality, a driving method thereof, and a display device using the pixel circuit. Background technique [0002] Flat panel display has the characteristics of complete planarization, lightness, thinness, and power saving. It is an inevitable trend and research focus of image display development. Among various types of flat panel display devices, since the active matrix organic light emitting display device (English full name is Active Matrix Organic Light Emitting Display, referred to as AMOLED) uses self-luminous organic light emitting diode (English full name is Organic Light Emitting Diode, referred to as OLED). ) to display images, has the characteristics of short response time, driving with low power consumption, and relatively better brightness and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3266G09G3/3233
Inventor 朱晖胡思明张婷婷
Owner CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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