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Pixel circuit and driving method and display device

A technology of pixel circuits and driving transistors, applied in static indicators, instruments, etc., can solve problems such as threshold voltage drift and uneven driving current of pixel circuits, maintain uniformity and stability, improve display quality, and ensure stability. Effect

Active Publication Date: 2015-04-15
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because the luminous brightness of the AMOLED display is directly proportional to the magnitude of the driving current supplied to the Organic Light-Emitting Diode ("OLED") device, in order to achieve the best display effect, a larger driving current is required, so Low-temperature polysilicon backplane technology is the best choice for AMOLED display backplane technology because it can provide high mobility. However, the inherent threshold voltage drift problem of low-temperature polysilicon technology causes the inhomogeneity of the driving current generated by the pixel circuit. Challenge the uniformity of display brightness

Method used

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

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Embodiment 1

[0038] figure 1 Shown is a schematic structural diagram of a pixel circuit in an embodiment of the present invention. In this embodiment, the circuit structure and working principle of the voltage-driven pixel circuit are specifically described by taking the pixel circuit structure of a common-cathode OLED display as an example. Such as figure 1 As shown, the pixel circuit in the embodiment of the present invention includes four thin film transistors, which are respectively a switch transistor 101, an isolation transistor 102, a drive transistor 103 and a compensation transistor 104, and also includes a storage capacitor 106, a general power supply electrode 110, a ground electrode 120 and The organic light emitting diode 130 , the gate line 140 provides a selection signal to turn on the switch transistor 101 , and the data line 150 writes a data voltage signal into the pixel through the switch transistor 101 . Wherein, the gate of the switching transistor 101 is connected t...

Embodiment 2

[0044] On the basis of the pixel circuit in the first embodiment, the embodiment of the present invention provides a pixel driving method using the pixel circuit.

[0045] figure 2 shown as figure 1 A schematic diagram of the driving timing of the driving method of the pixel circuit shown. Such as figure 2 As shown, in this timing diagram, the selection signal voltage GATE of the gate line 140 and the data voltage V data And the level EM of the enable electrode 140 that controls the on-off of the isolation transistor 102 . Wherein, the storage capacitor 106 needs to be discharged before writing into the pixel circuit, so as to eliminate the influence of the last frame data. The driving method mainly includes compensating the threshold voltage V of the driving transistor 103 th The sum driver displays two timing segments, while writing data is completed within the compensation timing segment. Compensation transistor 104 and driving transistor 103 are under the control o...

Embodiment 3

[0054] An embodiment of the present invention provides a display device, including the voltage-driven pixel circuit in the first embodiment. Specifically, the display device includes a plurality of pixel unit arrays, and each pixel unit corresponds to any pixel circuit in the above-mentioned embodiments. Since the pixel circuit compensates the drift of the threshold voltage of the driving transistor, the display of the organic light emitting diode is stable without flickering, thereby ensuring the display quality of the organic light emitting display device.

[0055] It can be seen from the above embodiments that the pixel circuit provided by the present invention blocks the connection between the drive transistor and the organic light-emitting diode through the isolation transistor when writing data into the pixel circuit, so as to ensure that the data is written into the pixel without affecting the organic light-emitting diode. The luminous state has an effect, avoiding flic...

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PUM

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Abstract

The invention belongs to the field of organic light emitting technique, and discloses a voltage-drive pixel circuit and a driving method and a display device, wherein the voltage-drive pixel circuit and the driving method and the display device can compensate transistor threshold value voltage drift and controls display of an active light emitting diode. According to the pixel circuit, connection of a drive transistor and an active light emitting diode is separated during data are read in the pixel circuit, the fact that the light emitting state of the active light emitting diode can not be affected when the data are read in the pixel circuit is ensured, and flicker of display is avoided. Threshold voltages and data voltage signals drive the transistor and are prestored in a storage capacitor, the transistor threshold value voltage drift is effectively compensated, uniformity and stability of drive current are kept, and display quality of the display device is improved.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, in particular to a pixel circuit and a driving method for controlling active light-emitting diode display capable of compensating transistor threshold voltage drift, and a display device. Background technique [0002] One of the ways to realize an Active Matrix Organic Light-Emitting Diode ("AMOLED") display is to use an active matrix thin film transistor backplane. The active matrix TFT backplane is provided with a pixel matrix defined by gate lines and data lines intersecting horizontally and vertically, and each pixel includes an active device (such as a transistor) and a light emitting device (such as a light emitting diode). The gate driving circuit sequentially provides selection signals to the selected gate lines to turn on the transistors in the pixels, and then the data driving circuit transmits the data signals to the turned-on pixels through the data line...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3225
Inventor 王颖
Owner BOE TECH GRP CO LTD
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