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Organic light-emitting diode driving circuit, display panel and displayer

A technology of light-emitting diodes and driving circuits, applied in static indicators, instruments, etc., can solve the problems of unstable working state of organic light-emitting diodes, poor Vth uniformity of driving tubes, different driving currents, etc. Good performance and good stability

Active Publication Date: 2012-08-29
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the manufacturing process, especially the low-temperature polysilicon technology, the threshold voltage Vth uniformity of the drive tube is very poor and has drift, resulting in different drive currents when the same gray-scale voltage is input.
The inconsistency of the driving current makes the working state of the OLED unstable, which is the main reason why the brightness uniformity of the traditional 2T1C circuit has been poor

Method used

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  • Organic light-emitting diode driving circuit, display panel and displayer
  • Organic light-emitting diode driving circuit, display panel and displayer
  • Organic light-emitting diode driving circuit, display panel and displayer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment one: if figure 1 As shown, the first preferred threshold compensation unit of the organic light emitting diode drive circuit of the present invention includes:

[0029] The first switching transistor T 1 : The gate is connected to the first control voltage V CR1 , the drain is connected to a high level V DD , the source is connected to the cathode of the organic light emitting diode;

[0030] The second switching transistor T 2 : The gate is connected to the second control voltage V CR2 , the drain is connected to a high level V DD , the source is connected to the anode of the organic light emitting diode;

[0031] The third switching transistor T 3 : The gate is connected to the third control voltage V CR3 , the drain and the source are respectively connected to the cathode of the organic light emitting diode and the A terminal of the capacitor;

[0032] The fourth switching transistor T 4 : Gate connected to scan line V SCAN , the drain and the s...

Embodiment 2

[0046] Embodiment two: if image 3 As shown, the second preferred threshold compensation unit of the organic light emitting diode driving circuit of the present invention includes:

[0047] The first switching transistor T 1 : The gate is connected to the first control voltage V CR1 , the drain is connected to a high level V DD , the source is connected to the cathode of the organic light emitting diode;

[0048] The second switching transistor T 2 : The gate is connected to the second control voltage V CR2 , the drain is connected to the cathode of the organic light emitting diode, and the source is connected to the driving circuit;

[0049] The third switching transistor T 3 : The gate is connected to the third control voltage V CR3 , the drain and the source are respectively connected to the organic light emitting diode cathode and the sixth switching transistor;

[0050] The fourth switching transistor T 4 : The gate is connected to the scan line, the drain and th...

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Abstract

The invention discloses an organic light-emitting diode driving circuit, a display panel and a displayer which are designed to solve the problem of an existing driving circuit that the brightness and the uniformity of an organic light-emitting diode are affected by the threshold voltage of a driving unit. The organic light-emitting diode driving circuit comprises the driving unit, a threshold compensation unit and the organic light-emitting diode. A preferable circuit structure comprises five switch tubes, one driving tube, one capacitor and one organic light-emitting diode, wherein N-type thin film transistors are preferably selected as the switch tubes and the driving tube. According to the invention, the working principle of the organic light-emitting diode driving circuit is as follows: the phenomenon that the working states of the organic light-emitting diode are inconsistent due to different threshold voltages of the driving tube in the whole circuit is eliminated through the threshold voltage Vth of the 6T1C circuit compensation driving tube, so that the brightness and uniformity problems of the organic light-emitting diode are solved.

Description

technical field [0001] The invention relates to an organic light emitting diode driving circuit, in particular to a voltage type active matrix organic light emitting diode driving circuit. Background technique [0002] The quality of the working state of the organic light-emitting diode directly affects its uniformity and brightness. Organic light-emitting diodes are current-controlling components, and are currently driven by the current generated by thin-film transistors in a saturated state. Due to the limitations of the manufacturing process, especially the low-temperature polysilicon technology, the threshold voltage Vth uniformity of the driving tube is very poor and has drift, resulting in different driving currents when the same gray-scale voltage is input. The inconsistency of the driving current makes the working state of the OLED unstable, which is the main reason why the brightness uniformity of the traditional 2T1C circuit has always been poor. Contents of the...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3233
Inventor 祁小敬谭文
Owner BOE TECH GRP CO LTD
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