OLED inventor Deng Qingyun: OLED features and challenges

In November 11, 2013, CHINASSL2013 semiconductor lighting industry annual event held a grand opening ceremony, from the global semiconductor lighting industry well-known scholars, industry gather together, summarize the development of the LED industry in the past, and the future of new challenges and new opportunities.

At the meeting, from the Department of chemical engineering, University of Rochester, OLED inventor professor Deng Qingyun, the site describes the material characteristics and challenges of OLED.

Professor Deng Qingyun

Deng Qingyun said, compared with LCD, OLED has more simple structure, does not require a backlight, filter and protection layer, has the advantages of high brightness, wide spectrum, low power, and can be made thin and flexible displays, coupled with high contrast and fast response, the structure of all solid close contact, not sensitive the atmospheric pressure therefore more broad applicable environment and other characteristics, the OLED is as a new generation of display technology rapid rise.

Currently, the challenge facing OLED is the application of OLED on how to replace LCD as a new screen material is a problem that needs to be addressed. LCD is likely to be replaced, because it is very complex, there are many layers of structure, such as some enhanced bright film, so that it can be very beautiful display. The OLED is only two layers, the power can be light after the light-emitting layer of different materials. Compared with LCD OLED, the biggest difference is that black is black, it is a self luminous products, turn off the power after not light, if done with OLED display with high contrast, the light source is not unique, but the display is very important to say.

OLED showed excellent performance in some applications, although OLED and LED have a little in the mobile phone display gap, but the application in the TV screen, need to overcome many obstacles, the OLED application development is also very important. For example, a OLED LG TV, 77 inches in size, you can curl. In the middle of the screen there is a white OLED as the filter, according to this technology, our display will be infinitely expanded, 77 inches just as a display, but the size of the OLED TV can be larger than this.

At present, Hongkong and the United States have already been listed on the OLED TV sales, which is better than the performance of the LED display, and the price of $10 thousand. In addition to the use of white OLED LG TV display material, Samsung is also developing OLED TV, it believes that the future of OLED TV will replace LCD tv.

At present, according to market forecast data show that by 2016, the number of OLED TV display will continue to grow.

For OLED applications in lighting it has a high color efficiency, when the power off it will appear black. For different applications, the characteristics of OLED can be presented as an advantage or a disadvantage. Since it is a scattered light source, it cannot be used as a point light source. At present, OLED as a light source, the price is very expensive, 1000lm luminous flux price reached $800, while LED only need $16. Therefore, OLED must reduce costs in order to be more competitive.

In addition, LED has a lot of blue light, but the lack of green light. OLED green light is very much, very little blue, so you can make a very soft light.

For the future application of OLED, Deng Qingyun hopes to reduce the price of OLED, and enhance its performance, and ultimately promote its large-scale application in the field of lighting and display.