Will OLEDs threaten LEDs?

The LED has been popular and the future is bright. But OLEDs are also entering the field of lighting.

LEDs and OLEDs are very different. The LED is a crystal point source. The OLED is actually a diffused source area that can be made several meters long and is an organic thin film. Currently OLEDs are extending to screen applications, trying to replace LCDs.

The small OLED-based screen was applied to mobile phones around 2000. Compared to multi-layer LCDs, OLEDs have only two layers that can be illuminated after power up. The biggest difference between the luminescent layer material of OLED and LED and LCD is that OLED is self-illuminating, and the power can not be turned off when the power is turned off. Therefore, if you use it as a screen or display, the contrast of the OLED is very high. For light sources, OLEDs are very important for displays.

The advantages of OLED can be exploited in many applications. For example, Samsung has used OLED technology to make more than 500 million mobile phones. Iphone 5S also uses OLED. Deng Qingyun pointed out that in fact, OLEDs are now similar to LEDs on the display. If you want to apply OLED on your TV, you still need to overcome many obstacles. But now Hong Kong and the United States have applications. In October 2013, Hong Kong already had an OLED TV. It is a 55-inch LG scrollable display that performs better than LEDs. Samsung believes that OLED screen TV will replace LCD TV and has made a lot of efforts. Panasonic is also developing OLED technology. Research company DisplaySearch predicts that in the future, the TV market will exceed 250Million in the TV market in 2016.

OLED

OLED TV shipment forecast

According to Deng Qingyun, LEDs have a lot of blue light, but there is not enough green light. In contrast, OLED green light is very much, and the blue light is very small, so it can make very soft light, which is the characteristic of OLED. In the field of lighting, because OLED is a decentralized light source, its 2GB color efficiency is very high. Dispersed light sources cannot be used as point sources. Therefore, OLEDs are mainly used in decoration and have not been used in ordinary lighting. But Deng Qingyun said that if the cost is lowered, OLED should be an important general illumination source in the future.

The performance of OLED is improving. The current luminous efficiency has reached 90 lumens and the lifetime has reached more than 10,000 hours. Princeton University and the University of California have also done research, according to their research, OLED efficiency can reach 100%. The OLED's light output sometimes has some loss. The biggest problem is the blue light problem, and its blue light life is very short. In order to improve the luminous efficiency of OLED, it is necessary to improve and optimize its structure at the same time. Deng Qingyun revealed that there are billions of investments in the field of O LED display , and the development of the fifth to eighth generation displays will eventually affect the development of the lighting industry.

Packaging technologies and materials will help future applications of OLEDs. Professor Deng Qingyun pointed out that a university professor has developed an OLED structure that has reached 100 lumens per watt. If the OLED structure is fabricated, it can make its light extraction rate higher. If a special treatment is applied to the OLED substrate, the luminous efficiency can reach 110 lumens, provided that the plastic must be durable, so it is necessary to consider whether the packaging technology is good.

Now, OSRAM's OLED lamps have emerged. Deng Qingyun believes that with the advancement of technology, OLED will be cheaper and better in the future.

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