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Display apparatus and pixel circuit thereof

A pixel circuit and circuit technology, applied in static indicators, instruments, etc., can solve problems such as uneven display

Active Publication Date: 2015-11-25
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present application provides a display device and its pixel circuit, which can compensate the threshold voltage shift of the driving transistor and the light-emitting device, and can also solve the problem of uneven display caused by the different threshold voltages of the driving transistors in various parts of the display panel.

Method used

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  • Display apparatus and pixel circuit thereof
  • Display apparatus and pixel circuit thereof

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Experimental program
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Effect test

Embodiment 1

[0073] Please refer to figure 2 , this embodiment provides a pixel circuit, including a first transistor 21, a second transistor 22, a third transistor 23, a first capacitor 26, a second capacitor 27 and a light emitting device 25,

[0074] The first transistor 21 and the light emitting device 25 are serially connected to the first voltage source signal terminal V DD[n] and the second voltage source signal terminal V SS between. The control pole of the first transistor 21 is connected to the second pole of the second transistor 22, the first pole of the first transistor 21 is connected to the first voltage source signal terminal, and the second pole of the first transistor 21 is connected to the anode of the light emitting device 25 ;

[0075] The control electrode of the second transistor 22 is connected to the first scanning control signal terminal V SCAN[n] , used to receive the first scan control signal of the current row, the first electrode of the second transistor ...

Embodiment 2

[0096] like Figure 4 As shown, this embodiment provides another pixel circuit, and its main difference from Embodiment 1 is that a fourth transistor 24 is added, and the fourth transistor 24 controls the second pixel circuit in the circuit under the control of the third scanning signal. Node B and the third node C are initialized; at this time, the first voltage source signal terminal V DD The input is no longer a pulse signal, but a constant high level, and the initialization is completed by the fourth transistor 24 .

[0097] The control electrode of the fourth transistor 24 is connected to the third scanning control signal terminal V R[n] , the first pole is connected to the anode of the light emitting device 25, and the second pole is connected to the third voltage source signal terminal V CM , for responding to the third scan control signal, to initialize the voltages of the second node B and the third node C to a certain low level in the initialization phase.

[0098...

Embodiment 3

[0102] Please refer to Image 6 , this embodiment provides another pixel circuit, its main difference from Embodiment 2 is that a fifth transistor 28 is added, and the control electrode of the fifth transistor 28 is connected to the fourth scanning signal terminal V SN[n] , the first pole is connected to the fourth voltage source signal terminal for inputting a constant reference voltage V REF , the second electrode is connected to the control electrode of the first transistor 21 . Under the control of the fourth scanning signal, the fifth transistor 28 provides a constant reference voltage V REF The benefit of doing this is that the row programming time can be greatly reduced, making the pixel circuit more suitable for large-area, high-resolution, high-frame-rate displays.

[0103] The driving signal waveform diagram of the pixel circuit in this embodiment is as follows Figure 7 As shown, a frame time T is also divided into four phases: an initialization phase, a threshol...

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Abstract

The invention provides a display apparatus and a pixel circuit thereof. The pixel circuit generates the threshold voltage information of a driving pipe by means of source following, the threshold voltage of the driving pipe and the reference voltage related to the gray scale information are generated at the two ends of a first capacitor through the voltage dividing of the first capacitor and a second capacitor, during the luminescence, the reference voltage maintains constant, the driving current through a luminescent device is irrelevant to the threshold voltage of a driving transistor and the luminescent device, and the threshold voltage deviation of the driving transistor and the luminescent device can be compensated, so that the nonuniform display problem of a display panel is solved. The display apparatus emits light line by line and overlaps scanned control signals to reduce the line programming time of the circuit, so that the demands for high-resolution and high-frame-frequency display panels can be met while the high precision is obtained. When the light is emitted by a concentrated way, the pixel circuit reduces the complexity and increases the luminescence time by means of grouped programming and grouped luminescence.

Description

technical field [0001] The present application relates to the field of display technology, in particular to a display device and a pixel circuit thereof. Background technique [0002] Organic Light-Emitting Diode (OLED, OrganicLight-EmittingDiode) display has been widely studied in recent years due to its advantages of high brightness, high luminous efficiency, wide viewing angle, low power consumption, and low manufacturing cost, and has been rapidly applied to a new generation of display devices. . OLED display can be divided into PMOLED (PassiveMatrixOLED, passive matrix OLED) and AMOLED (ActiveMatrixOLED, active matrix OLED) according to the pixel driving method. Although PMOLED has low manufacturing cost, it has crosstalk and requires a large driving current, so it has disadvantages such as short service life and high power consumption, and cannot meet the display requirements of large area and high resolution. In contrast, AMOLED avoids problems such as duty cycle an...

Claims

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Application Information

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IPC IPC(8): G09G3/32
CPCG09G3/3233G09G2300/0819G09G2300/0852G09G2300/0861G09G2310/0216G09G2310/0218G09G2320/0233G09G2320/045G09G3/2018G09G3/3266G09G3/3291G09G2300/0426G09G2310/0289G09G2310/08G09G2320/064
Inventor 张盛东王翠翠冷传利
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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