Pixel compensating circuit

A compensation circuit and pixel technology, applied in static indicators, instruments, etc., can solve problems such as different brightness, different threshold voltage, and scan time affecting compensation effects, etc., to achieve extended service life, uniform brightness, and overcome process differences and current Falling effect

Inactive Publication Date: 2013-04-10
AU OPTRONICS CORP
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Problems solved by technology

Considering that the OVDD metal line itself has impedance, there will be a voltage drop, resulting in a difference in the OVDD of each pixel, resulting in a current difference between different pixels
In this way, different currents flowing through the OLED will produce different brightness, and thus the AMOLED panel will be uneven.
In addition, due to the influence of the manufacturing process, the threshold volta

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[0029] In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the accompanying drawings and the following various specific embodiments of the present invention. The same signs in the accompanying drawings represent the same or similar components. However, those of ordinary skill in the art should understand that the embodiments provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for illustrative purposes, and are not drawn according to their original dimensions.

[0030] The specific implementation manners of each aspect of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] figure 1 It shows a schematic diagram of the principle of a pixel compensation circuit in the prior art adopting the "2T1C" architecture. Reference figure 1 The pixel compensation circuit has a "2T1C" structure, where 2T...

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Abstract

The invention provides a pixel compensating circuit which comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch and an organic light emitting diode. A first end of the first switch is connected with a data signal. A control end of the switch is connected with a first control signal. A first end of the second switch is connected with a first voltage. A control end of the second switch is connected with a second control signal. A control end of the third switch is connected with a second end of the first switch. A first capacitance is arranged between a first end and the control end of the third switch. A first end of the fourth switch is connected with the second end of the first switch. A control end of the fourth switch is connected with a third control signal. A control end of the fifth switch is connected with a fourth control signal. An anode of the organic light emitting diode is connected with a second end of the fifth switch. A cathode of the organic light emitting diode is connected with a second voltage. Adopting the pixel compensating circuit, service life of the organic light emitting diode (OLED) is prolonged due to the fact that the fifth switch is in an open state only in the lighting period. In addition, electric current which flows through the OLED is only in relation to reference voltage and data voltage and influences such as difference of processing and fall of the electric current are overcome.

Description

technical field [0001] The invention relates to an active matrix organic light emitting diode panel, in particular to a pixel compensation circuit of the AMOLED panel. Background technique [0002] Organic light emitting diodes (Organic Light Emitting Diode, OLED) can be divided into passive matrix driving (Passive Matrix OLED, PMOLED) and active matrix driving (Active Matrix OLED, AMOLED) according to the driving method. Among them, the PMOLED does not emit light when data is not written, but only emits light during data writing. This driving method is simple in structure, low in cost, and easy to design, and is mainly suitable for small and medium-sized displays. [0003] The biggest difference between AMOLED and PMOLED is that each pixel has a capacitor to store data, so that each pixel can maintain a light-emitting state. Since the power consumption of AMOLED is significantly lower than that of PMOLED, and its driving method is suitable for the development of large-siz...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3233
Inventor 陈怡倩张华罡
Owner AU OPTRONICS CORP
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