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Pixel circuit for driving light emitting device to emit light and display device

A technology of light-emitting devices and pixel circuits, which is applied to instruments, static indicators, etc., and can solve problems such as uneven backplane current and uneven image brightness

Active Publication Date: 2015-02-04
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the same driving signal is applied to each pixel, the current flowing through each OLED in the backplane display area is not equal, resulting in uneven current on the backplane, resulting in uneven brightness of the image

Method used

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  • Pixel circuit for driving light emitting device to emit light and display device
  • Pixel circuit for driving light emitting device to emit light and display device
  • Pixel circuit for driving light emitting device to emit light and display device

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Experimental program
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Embodiment Construction

[0036] Embodiments of the present invention provide a pixel circuit and a display device for driving a light-emitting device to emit light, which are used to improve the uniformity of image brightness in a display area of ​​the display device.

[0037] The pixel circuit is connected to the light-emitting device, including a charging sub-circuit and a driving sub-circuit for realizing functions such as charging and driving; in the charging phase, the charging sub-circuit works, and the light-emitting device stops working; in the light-emitting phase, the charging sub-circuit stops working, and the driving sub-circuit The sub-circuit works to drive the light-emitting device to emit light.

[0038] The driving transistor and each switching transistor in the pixel circuit of the embodiment of the present invention may be a thin film transistor (Thin Film Transistor, TFT) or a metal oxide semiconductor field effect transistor (Metal Oxid Semiconductor, MOS). The driving transistor ...

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PUM

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Abstract

The embodiment of the invention provides a pixel circuit for driving a light emitting device to emit light and a display device which are used for improving the brightness uniformity of an area image which is displayed by the display device. The pixel circuit comprises a rechargeable sub-circuit, a drive sub-circuit, and a light-emitting control sub-circuit; the drive sub-circuit comprises a reference signal source, a driving transistor and a capacitor, wherein a grid electrode of the driving transistor is connected with the first end of the capacitor, a source electrode of the driving transistor is connected with the output end of the reference signal source, and a drain electrode of the driving transistor is connected with the first end of the light-emitting control sub-circuit; and the second end of the capacitor is connected with the rechargeable sub-circuit, and the second end of the light-emitting control sub-circuit is connected with the light emitting device.

Description

technical field [0001] The invention relates to the field of organic light emitting technology, in particular to a pixel circuit and a display device for driving a light emitting device to emit light. Background technique [0002] Organic Light Emitting Diode (OLED) displays have attracted much attention due to their advantages of low power consumption, high brightness, low cost, wide viewing angle, and fast response, and have been widely used in the field of organic light emitting technology. [0003] In OLED displays, there are the following unavoidable problems. First of all, each transistor used to realize image display on the backplane has structural inhomogeneity in the manufacturing process, as well as inhomogeneity in electrical performance and stability, resulting in the threshold voltage V of the transistor. th A drift has occurred. Second, transistors suffer from reduced stability when turned on for long periods of time. In addition, with the development of OLE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3208
Inventor 马占洁
Owner BOE TECH GRP CO LTD