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The color of OLED technology
2011-10-07 by seoer

LCD display panels monitor to test whether the market competitive in an important symbol, many full-color technology is also applied to the OLED display, according to the panel, usually of three types: RGB pixel independent light, light color conversion (Color Conversion) and color filter (Color Filter).

A, RGB pixel independent light

Use light-emitting material is used the most independent color model. It is the use of precision metal mask and the CCD pixels on digital technology, the first preparation of red, green and blue color light-emitting center, then adjust the combination of three colors blending ratio, resulting in true color, so that the three-color light-emitting OLED device constitutes an independent a pixel. The technology is the key to improve the color purity and luminescent materials emitting efficiency of the metal shadow mask etching technique is also crucial.

At present, organic light-emitting materials AlQ3 small molecule is a good point a small green light in the material, its green color purity, luminous efficiency and stability are good. However, the best red-emitting OLED materials, small molecule emitting efficiency of only 31mW, life 10,000 hours, the blue light-emitting small molecule materials development is also very slow and very difficult. Organic small molecule light-emitting materials is the biggest bottleneck in the purity of red and blue materials, efficiency and life expectancy. But people to the main light-emitting materials by doping, has been the color of purity, luminous efficiency and stability are good blue and red.

The advantage of polymer light-emitting materials can be chemically modified to adjust its wavelength, has been red from blue to green to cover the entire visible range of colors, but the life span of only a small one-tenth of the molecular light emitting material, so of the polymer, light-emitting efficiency and lifetime of materials are to be improved. Continue to develop light-emitting materials with excellent performance materials development workers should be an arduous and long-term issues.

With the color of the OLED displays, high resolution and large area of ​​the metal shadow mask etching a direct impact on the quality of the picture display panel, so the metal mask dimensional accuracy and positioning accuracy graphics made more stringent requirements.

Second, the light color conversion

Conversion is a light color with light blue OLED array of color conversion film, the first preparation of blue OLED device, then use the blue excitation light color conversion materials to be red and green, to gain full color. The technology is the key to improve the color light color conversion material purity and efficiency. This technique does not require metal shadow mask alignment technology, simply evaporated blue OLED elements, is the future of large-size full-color OLED display great potential of one full-color technology. But its drawback is that the color conversion materials to absorb light in the blue environment, resulting in decreased image contrast, while the light guide can also cause reduced image quality problems. This technology currently available in Japan Idemitsu Kosan Company has produced a 10-inch OLED display.

Third, the color filter

This technique is the use of white OLED with color filters, the first preparation of fat white OLED devices, and color filters to get through the three primary colors, then mix three primary colors to achieve color display. The technology is the key to achieve high efficiency and high purity white light. Its production process does not require metal shadow mask alignment techniques, can be mature liquid crystal display color filter of LCD production technology. So is the future of large-size full-color OLED displays have the potential to one full-color technology, but the use of this technology through the color filter so that the light caused by the loss of up to two-thirds. TDK Corporation of Japan and the United States is currently Kodak's OLED displays produced using this method.

RGB pixel independent light, light color conversion and color filter manufacturing three kinds of full-color OLED display technology, advantages and disadvantages. According to the decision process structure and organic materials.

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