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Organic light emitting diode pixel circuit

A technology of light-emitting diodes and pixel circuits, which is applied in the field of OLED pixel circuits, and can solve problems such as the decrease of display brightness and the rise of the critical conduction voltage of OLED components.

Inactive Publication Date: 2013-02-13
DONGGUAN MASSTOP LIQUID CRYSTAL DISPLAY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long-time enabled conduction will cause the critical conduction voltage of the OLED element to rise and the display brightness to decrease.

Method used

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  • Organic light emitting diode pixel circuit
  • Organic light emitting diode pixel circuit
  • Organic light emitting diode pixel circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0037] Please refer to image 3 , which shows a detailed circuit diagram of the OLED pixel circuit according to the first embodiment of the present invention. In the OLED pixel circuit 10 of this embodiment, the pixel driving unit u1 has a 2T1C circuit structure, which includes, for example, a node Nc, transistors M1, M2, and a capacitor C; the display electric element u2 includes an OLED element D1; the electric compensation unit u3 It includes a transistor M3 and an OLED element D2, wherein the OLED element D2 is used to implement a compensation electro-element, and the transistor M3 is used to implement an auxiliary driving unit.

[0038] Furthermore, the transistors M1 - M2 are, for example, N-type Metal Oxide Semiconductor (MOS) transistors. The gate of the transistor M1 receives the current scan signal S(i), the source is coupled to the node Nc, and the drain is coupled to the data line to receive the data voltage Vdata. The gate of the transistor M2 is coupled to the ...

no. 2 example

[0056] Please refer to Figure 4 , which shows a circuit diagram of an OLED pixel circuit according to a second embodiment of the present invention. The difference between the OLED pixel circuit 20 of this embodiment and the OLED pixel circuit 10 of the first embodiment is that the transistors therein adopt the LTPS process, so all of them are P-type MOS transistors.

[0057] Taking the electro-compensation unit u3 as an example, the gate of the transistor M13 receives the low-level reference voltage VSS, and the drain is coupled to the positive terminal of the OLED element D2; and the negative terminal of the OLED element D2 is connected to receive the low-level reference voltage The terminal of VSS, the source of the transistor M13 is coupled to the driving node Nd to receive the driving voltage Vdr. In this way, when the OLED pixel circuit 20 is not affected by the stress effect, the positive terminal voltage of the OLED element D1 serves as the power supply of the electro...

no. 3 example

[0061] Please refer to Figure 5 , which shows a circuit diagram of an OLED pixel circuit according to a third embodiment of the present invention. The OLED pixel circuit 30 of this embodiment is different from the OLED pixel circuit 10 of the first embodiment in that the pixel driving unit u1 has a different circuit structure. Further, the pixel driving unit u1 of this embodiment includes nodes Nc1, Nc2, transistors M21-M25 and a capacitor C, wherein the transistors M21-M25 are, for example, NMOS transistors.

[0062] The gate of the transistor M21 receives the scan signal S(i) of the current stage, the drain is coupled to the data line to receive the data voltage Vdata, and the source is coupled to the node Nc1. The gate of the transistor M22 receives the current scan signal S(i), the drain is coupled to the node Nc1 , and the source is coupled to the node Nc2 . The gate of the transistor M23 is coupled to the node Nc2 , the drain is coupled to the node Nc1 , and the sourc...

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Abstract

An organic light emitting diode pixel circuit comprises a driving node, a pixel driving unit, a display electroluminescence element and an electroluminescence compensating unit, wherein the pixel driving unit is coupled to a data line so as to receive data voltage, responds to the data voltage and provides driving voltage to the driving node; the display electroluminescence element is coupled to the driving node, responds to the driving voltage and emits the light; the level of the driving voltage is related to the aging factor voltage of the display electroluminescence element; the aging factor voltage corresponds to the using time of the electroluminescence element; the electroluminescence compensating unit is coupled to the driving node; an electroluminescence compensating circuit comprises a compensating electroluminescence element; the electroluminescence compensating unit drives the compensating electroluminescence element to emit the light according to the driving voltage; and aging decay compensation on the display electroluminescence element can be realized by the compensating electroluminescence element.

Description

technical field [0001] The present invention relates to an organic light emitting diode (Organic Light Emitting Diode, OLED) pixel circuit, and in particular to an OLED pixel circuit capable of compensating for the decrease in brightness of the OLED element due to long-term use. Background technique [0002] In today's era of rapid technological development, Organic Light Emitting Diode (OLED) technology has been developed and used in many display applications, such as TVs, computer screens, notebook computers, mobile phones or Personal digital assistants and more. Generally speaking, an OLED display includes a plurality of OLED pixel circuits arranged in a matrix, and each OLED pixel circuit includes an OLED element and a corresponding driving circuit. [0003] Generally speaking, the OLED element and its driving circuit in the OLED display need to be turned on for a long time to perform image display operations accordingly. However, the long-time enabled conduction will ...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3258
Inventor 黄显雄王文俊廖文堆王宗裕黄志鸿
Owner DONGGUAN MASSTOP LIQUID CRYSTAL DISPLAY
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