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Light emitting device

A technology for light-emitting devices and light-emitting diodes, applied in lighting devices, electroluminescent light sources, light sources, etc., can solve the problems of shortening the service life of organic light-emitting displays, and achieve the effects of long service life and reduced power consumption

Active Publication Date: 2007-01-10
LG DISPLAY CO LTD
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, the lifespan of organic light-emitting displays including conventional AMOLEDs may be shortened

Method used

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Embodiment Construction

[0044] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0045] image 3 An equivalent circuit diagram of the organic light emitting device according to the first embodiment of the present invention is illustrated. Specifically, the organic light emitting device is an AMOLED.

[0046] As shown, the AMOLED 20 includes a driving TFT denoted as DT, first and second switching TFTs denoted as ST1 and ST2, a storage capacitor Cst, and an OLED.

[0047] The driving TFT DT and the first and second switching TFTs ST1 and ST2 are NMOS transistors. The second switching TFT ST2 is a threshold voltage compensator for compensating the threshold voltage.

[0048] OLEDs include an organic light emitting layer formed between charge transport layers, and emit light through coupled electron-hole pairs. The OLED is connected between the power supply voltage VDD and the driving TFT DT.

[0049] OLED emits th...

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Abstract

A light emitting device is provided. Specifically, the light emitting device includes a threshold voltage compensator. The threshold voltage compensator is connected between the gate and the drain of the driving TFT, and its gate is connected to the second scanning line to reflect the threshold voltage of the driving TFT in response to the second scanning signal provided by the second scanning line The gate voltage of the LED is temporarily stored at the storage capacitor, and the data signal is transmitted when the output current is supplied to the LED, regardless of the change of the threshold voltage of the driving TFT.

Description

technical field [0001] The invention relates to a light emitting device. Background technique [0002] An organic light-emitting device, also known as an organic light-emitting diode (OLED), is a self-luminous device that causes a fluorescent material to emit light when electron-hole pairs are generated. Compared with passive light-emitting devices such as liquid crystal displays, which require a separate light source, self-luminous light-emitting devices have faster response speed and lower DC driving voltage, and can be realized with very thin films. These advantages enable organic light emitting displays to be realized in various configurations, such as wall-mounted and portable. [0003] Organic light-emitting devices use pixels in which red, blue, and green sub-pixels each produce a color to achieve color. Organic light emitting devices may be classified into passive matrix OLEDs (PMOLEDs), which are simple matrices, and active matrix OLEDs (AMOLEDs), which use thin f...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/30G09G3/20H05B33/08H05B33/14H05B44/00
CPCG09G3/3225G09G2330/021G09G2300/0876G09G2300/043H10K59/123
Inventor 韩敞旭裵晟埈
Owner LG DISPLAY CO LTD
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