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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: 2013-02-13
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

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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, a pixel circuit structure of a common cathode organic light emitting diode display is taken as an example to specifically describe the circuit structure and working principle of the voltage-driven pixel circuit. Such as figure 1 As shown, the pixel circuit in the embodiment of the present invention includes 4 thin film transistors, namely a switching transistor 101, a blocking transistor 102, a driving transistor 103, and a compensation transistor 104. It also includes a storage capacitor 106, a total power supply electrode 110, a ground electrode 120 and The organic light emitting diode 130 and the gate line 140 provide a selection signal to turn on the switching transistor 101, and the data line 150 writes a data voltage signal into the pixel through the switching transistor 101. Among them, the gate of the switching transistor 101 is conne...

Embodiment 2

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

[0045] figure 2 Shown as figure 1 The driving timing diagram of the driving method of the pixel circuit shown. Such as figure 2 As shown, in the timing diagram, the selection signal voltage GATE of the gate line 140 and the data voltage V of the data line 150 in the working sequence of one frame are shown. data And the level EM of the enable electrode 140 that controls the on and off of the blocking transistor 102. Among them, the storage capacitor 106 needs to be discharged before writing into the pixel circuit to eliminate the influence of the previous frame data. The driving method mainly includes compensating the threshold voltage V of the driving transistor 103 th And the drive shows two timing segments, and writing data is completed in the compensation timing segment. The compensation transistor 104 ...

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 foregoing embodiments. Since the pixel circuit compensates for the threshold voltage drift of the driving transistor, the display of the organic light emitting diode is stable without flicker, 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 driving transistor and the organic light-emitting diode through the blocking transistor when writing data to the pixel circuit, so as to ensure that the organic light-emitting diode will not be disturbed when data is written to the pixel. The light-emitting state has an impact, and the flicker of th...

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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 field of organic light-emitting display technology, and in particular to a pixel circuit capable of compensating for the threshold voltage drift of a transistor to control active light-emitting diode display, a driving method and a display device. Background technique [0002] One way to realize Active Matrix Organic Light-Emitting Diode (AMOLED) displays is to use an active matrix thin film transistor backplane. The active matrix thin film transistor backplane is provided with a pixel matrix defined by gate lines and data lines crossing 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, turning on the transistors in the pixels, and then the data driving circuit transmits the data signals to the turned-on pixels through the dat...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3225
Inventor 王颖
Owner BOE TECH GRP CO LTD
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