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Compensation circuit for keeping luminance intensity of diode

A technology of luminous brightness and compensation circuit, which is applied in the field of compensation circuit, and can solve problems such as the decrease of luminous efficiency and the reduction of component luminous brightness

Active Publication Date: 2013-01-09
HANNSTAR DISPLAY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a compensation circuit for maintaining the luminous brightness of the diode, so as to solve the problems existing in the prior art such as the decline of luminous efficiency and the problem caused by the OLED current I OLED The problem that the decline reduces the luminance of organic light emitting diode (Organic Light Emitting Diode, OLED) components

Method used

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  • Compensation circuit for keeping luminance intensity of diode
  • Compensation circuit for keeping luminance intensity of diode
  • Compensation circuit for keeping luminance intensity of diode

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Embodiment Construction

[0029] The embodiments of the compensation circuit for maintaining the luminance of the diode according to the present invention will be described below with reference to the relevant drawings. For ease of understanding, the same components in the following embodiments are described with the same reference numerals.

[0030] Please refer to Figure 4 , Figure 4 It is a schematic circuit diagram of the first embodiment of the compensation circuit for maintaining the luminous brightness of the diode according to the present invention. As shown in the figure, the compensation circuit of the present invention includes two P-type thin-film transistors (Thin-Film Transistor, TFT) T1 and T2, two N-type thin-film transistors T3 and T4, a photodiode (Photodiode) D and a capacitor c. In this embodiment, two control signals Emit[n], Scan[n] and three power supply signals V DD , V SS and V Data . Among them, T4 can be used to drive an organic light emitting diode (Organic Light Emi...

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Abstract

The invention discloses a compensation circuit for keeping luminance intensity of a diode. The compensation circuit comprises a stabilization unit, a first transistor, a second transistor, a third transistor, a fourth transistor and an organic light emitting diode (OLED). The stabilization unit comprises a photodiode and a compensation capacitor. The second transistor is used to control the input time of data. In the operation of the OLED, the third transistor discharges or charges a node of the stabilization unit continuously to keep a voltage equal to VSS or VDD, so as to maintain the luminance intensity of the OLED.

Description

technical field [0001] The invention relates to a compensation circuit, in particular to a compensation circuit capable of maintaining the brightness stability of an organic light-emitting diode light-emitting component. Background technique [0002] Active-Matrix Organic Light-Emitting Diode (AMOLED) display has thin thickness, light weight, self-illumination, low driving voltage, high efficiency, high contrast, high color saturation, fast response, and It is regarded as the most promising emerging display technology after Thin Film Transistor Liquid Crystal Display (TFT-LCD). [0003] However, since the brightness displayed by the organic light emitting diode (Organic Light Emitting Diode, OLED) component is determined by the magnitude of the current flowing, it is necessary to accurately control the current if the brightness of the pixel is to be accurately controlled. Compared with the TFT- LCD can control the brightness of pixels only by controlling the voltage level w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G3/3233G09G3/3291G09G2300/0819G09G2300/0842G09G2300/0861G09G2310/0262G09G2320/0223G09G2320/0295G09G2320/043G09G2320/045G09G2360/148
Inventor 柯健专吴昭慧
Owner HANNSTAR DISPLAY CORPORATION