Pixel unit drive circuit, pixel unit drive method, pixel unit and display device

A driving circuit and pixel unit technology, which is applied in the field of pixel unit driving circuit, pixel unit and display device, can solve the problems of OLED current inconsistency, influence on display effect, uneven luminous brightness of pixel unit, etc., to ensure driving voltage and driving current, The effect of ensuring uniformity and improving quality

Active Publication Date: 2013-05-22
HEFEI BOE OPTOELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the expression for the current through the OLED (i.e., Equation (1)), it can be seen that this current is not only affected by the data voltage V data controlled by the drive transistor T 2 Threshold voltage V th The impact, that is, the existing 2T1C structure cannot control the threshold voltage V th drift or threshold voltage V th Compensate for inconsistencies
Due to the driving transistor T in each pixel unit driving circuit 2 It is impossible to have completely consistent performance parameters, and there is no adjustment for the driv

Method used

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  • Pixel unit drive circuit, pixel unit drive method, pixel unit and display device
  • Pixel unit drive circuit, pixel unit drive method, pixel unit and display device
  • Pixel unit drive circuit, pixel unit drive method, pixel unit and display device

Examples

Experimental program
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Example Embodiment

[0055] Example 1:

[0056] Such as figure 2 As shown, this embodiment provides a pixel unit driving circuit for driving a light emitting device to emit light, which includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a storage capacitor Cs.

[0057] Wherein, the first thin film transistor T1 includes a gate, a first electrode, and a second electrode. The gate is connected to the scan line Gate, the first electrode is connected to the data line Data, and the second electrode is connected to the first electrode. Node A is connected.

[0058] The second thin film transistor T2 includes two gates, a first electrode and a second electrode, that is, the second thin film transistor is a double-gate TFT, and one of the two gates is connected to the scan line Gate, The other gate is connected to the second control line Scan2, the first electrode is connected to the storage capacitor Cs, and the second electrode is connected to the...

Example Embodiment

[0092] Example 2:

[0093] Such as Figure 5 As shown, this embodiment provides a pixel unit driving circuit for driving the OLED to emit light.

[0094] The difference between the pixel unit driving circuit described in this embodiment and the pixel unit driving circuit described in the first embodiment is that the first node A is connected to the scan line Gate.

[0095] This embodiment also provides a pixel unit including an OLED and the aforementioned pixel unit driving circuit connected to it.

[0096] This embodiment also provides a display device including a plurality of pixel units distributed in a matrix.

[0097] Such as Image 6 As shown, this embodiment also provides a pixel unit driving method applied to the above pixel unit driving circuit, including the following steps:

[0098] s201. Turn on the first thin film transistor T1 and the second thin film transistor T2, and pre-charge the first thin film transistor T1 so that the first node A has an initial voltage.

[0099] Spe...

Example Embodiment

[0127] Example 3

[0128] Such as Figure 8 As shown, this embodiment provides a pixel unit driving circuit for driving the OLED to emit light.

[0129] The difference between the pixel unit driving circuit described in this embodiment and the pixel unit driving circuit described in embodiment 1 is that: the driving circuit further includes a fourth thin film transistor T4, which includes a gate, a first electrode, and a second electrode; The gate is connected to the first control line Scan1, the first pole is connected to the second node B, and the second pole is grounded.

[0130] This embodiment also provides a pixel unit including an OLED and the aforementioned pixel unit driving circuit connected to it.

[0131] This embodiment also provides a display device including a plurality of pixel units distributed in a matrix.

[0132] The matrix composed of the pixel unit driving circuit and the OLED connected to it in this embodiment is as Picture 9 As shown, the display device include...

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Abstract

The invention provides a pixel unit drive circuit for driving a light-emitting device to emit light. A grid of a first thin film transistor is connected with a scanning line, a first pole is connected with a data line and a second pole is connected with a first node. One grid of a second thin film transistor is connected with a scanning line, the other grid is connected with a second control line, a first pole is connected with a storage capacitor, and a second pole is connected with a second node. One grid of the third thin film transistor is connected with the first node, the other grid is connected with the second control line, a first pole is connected with a power supply, and a second pole is connected with the second node. One end of the storage capacitor is connected with the first node. The other end of the storage capacitor is connected the first pole of the second thin film transistor. One end of the light-emitting device is connected with the second node. The other end of the light-emitting device is grounded. Correspondingly, a pixel unit drive method, a pixel unit and a display device are provided. By the pixel unit drive circuit, influence of variation of threshold voltage on drive voltage can be reduced even eliminated.

Description

technical field [0001] The present invention relates to the technical field of display driving, in particular to a pixel unit driving circuit, a pixel unit driving method, a pixel unit and a display device. Background technique [0002] OLED (Organic Light-Emitting Diode, organic light-emitting diode) display, also known as organic electroluminescence display, is an emerging flat-panel display device, due to its simple preparation process, low cost, low power consumption, high luminous brightness, Wide range of working temperature, light and thin size, fast response speed, easy to realize color display and large-screen display, easy to realize matching with integrated circuit driver, easy to realize flexible display, etc., so it has broad application prospects. [0003] OLED pixel units in organic electroluminescent displays are generally arranged in a matrix, and can be divided into passive matrix (Passive Matrix-Organic Light Emission Display, PM-OLED for short) driving me...

Claims

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Application Information

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IPC IPC(8): G09G3/32H05B44/00
CPCG09G3/32G09G3/3233G09G2300/0819G09G2300/0842G09G2310/0262G09G2320/045H05B45/60
Inventor 孟庆超刘晓燕王文杰苏晓俊
Owner HEFEI BOE OPTOELECTRONICS TECH
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