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Pixel circuit, display device and driving method

A pixel circuit and pixel technology, applied in the field of pixel circuits, display devices and the driving of display devices, can solve the problems of the influence of the final driving current, the limitation of the threshold extraction accuracy, and the increase of the cost of the peripheral gate driving circuit, and achieve high compensation accuracy. Sex, glow time increase, number reduction effect

Active Publication Date: 2012-12-26
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 2 As shown, in addition to a data line (VDATA[m]) and a gate scan line (VSCAN2[n]), this circuit also adds two gate scan lines (VSCAN1[n] and VSCAN3[n]), This increases the cost of the peripheral gate drive circuit, and the circuit has to complete the two functions of precharging and threshold value extraction in one line time, which will increase with the pixel line time in high-resolution or high frame rate display devices. The reduction of the threshold makes the accuracy of threshold value extraction limited; in addition, the first transistor (T1) of the circuit is in the normally open state, and the gate voltage is relatively high (greater than the power supply voltage VDD), and its V TH The drift of will also have a great influence on the final drive current

Method used

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

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Experimental program
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Embodiment 1

[0033] Figure 4 What is shown is a structural diagram of a display device according to Embodiment 1 of the present application. Such as Figure 4 As shown, the display device includes: a pixel array 41, a gate driving circuit 42, a data driving circuit 43·, a first power line VCOMP and a second power line VDD arranged in a first direction for supplying control signals and driving voltages, and the like. Among them, the pixel array 41 includes: scanning control lines VSCAN[1], ..., VSCAN[N] controlled by the gate driving circuit 42, data lines VDATA[1], VDATA[2], ... controlled by the data driving circuit 43 , VDATA[M], and the pixel circuits Pixel[1][1]...Pixel[N][M] arranged at the intersection between the scanning control line and the data line (that is, the pixel array is N rows, M columns, where N and M are both positive integers). Generally, the pixel circuits in the same row in the pixel array 41 are connected to the same scan control line, and the pixels in the same...

Embodiment 2

[0060] Figure 7 It is a schematic structural diagram of a pixel circuit in Embodiment 2 of the present application. Such as Figure 7 As shown, the pixel circuit includes: a threshold voltage extraction module 73 , a programming module 71 , a driving module 74 , a capacitor module 72 and a light emitting element. The circuit structures of the programming module 71 , the driving module 74 and the light emitting element are the same as those in Embodiment 1 of the present application. It will not be repeated here.

[0061] Such as Figure 7 As shown, the capacitive module of the second embodiment includes a first capacitive element C1 and a second capacitive element C2. The connection relationship is different from that of the first embodiment in that the second terminal of the second capacitive element C2 is connected to the ground. The second capacitive element is used for storing the driving voltage during the light-emitting phase, so as to ensure the stability of the l...

Embodiment 3

[0063] Figure 8 What is shown is the pixel circuit configuration of Embodiment 3 of the present application. Such as Figure 8 As shown, the pixel circuit includes: a threshold voltage extraction module 83 , a programming module 81 , a driving module 84 , a capacitor module 82 and a light emitting element. The circuit connection relationship of each module is the same as that of the first embodiment.

[0064] The difference between the third embodiment of the present application and the first embodiment is that the reference potential Vref is shared with the second power line VDD. In this way, in the initialization phase, as long as the second power line VDD is set to a low enough potential, an initial low level can be given to the source of the drive transistor TD; then in the threshold value extraction phase, the second power line VDD should be changed to a high potential VDDH , here, the VDDH value cannot be too high to ensure that the OLED is not turned on during the t...

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Abstract

The application discloses a pixel circuit, a display device and a driving method. The pixel circuit comprises a programming module, a threshold voltage extraction module, a capacitor module and a driver module, wherein the programming module is used for receiving a video signal from a data line under the control of a first scanning control line and transferring the signal to the capacitor module; the threshold voltage extraction module is used for extracting threshold voltage information of the driver module under the control of a first power line and storing the information to the capacitor module; the capacitor module is used for storing the threshold voltage information, receiving the video signal of the programming module, superimposing the threshold voltage information on the video signal to form a driving voltage, and supplying the driving voltage to the driver module; and the driver module is used for receiving the driving voltage supplied by the capacitor module and generating a driving current under the control of a second power line to enable a light emitter to emit light. The pixel circuit, the display device and the driving method provided by the invention have the beneficial effect that through adopting a charging-type threshold extraction mode, good compensating effect on both positive and negative threshold voltages can be achieved; and through adopting a centralized compensation plus dispersed compensation method, the circuit can be applied to a high definition or high frame rate display device without adding a peripheral drive circuit module.

Description

technical field [0001] The present application relates to the technical field of display devices, in particular to a pixel circuit, a display device and a driving method for the display device. Background technique [0002] Organic Light-Emitting Diode (OLED: Organic Light-Emitting Diode) display has been extensively studied in recent years due to its advantages of high brightness, high luminous efficiency, wide viewing angle and low power consumption, and has been rapidly applied to a new generation of displays. The OLED display can be driven in two ways: passive matrix driving (PMOLED: Passive Matrix OLED) and active matrix driving (AMOLED: Active Matrix OLED). 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 sou...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3233
Inventor 张盛东冷传利
Owner BOE TECH GRP CO LTD
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