DNP Develops High-Luminance Blue Resist to Achieve Brighter Colors
To be offered as LCD color filter
Dai Nippon Printing Co., Ltd. (DNP) has successfully developed a high-luminance, high-transmittance dye-based color resist with ultra-heat resistant features, as a substitute for the pigment-based blue color resists currently used in LCD color filters. DNP is forging ahead with research designed to commercialize materials technology, in addition to processing technology, and will offer the dye-based color resist and the color filters that use this product as a new solution for high resolution smart phones, along with 4K and 8K televisions.
In recent years, color management has been generally conducted in order to match colors displayed via different media, such as television and smart phone displays and those using paper. As a result, there have been increased demands for displays that are compatible with standards, such as Adobe RGB (Red, Green and Blue) and Digital Cinema Initiatives (DCI) that facilitate brighter color reproduction over a broader color gamut. And this has fed increased needs for solutions that allow for color reproduction over a broader color gamut at manufacturers of mobile terminals and TVs. In order to reply to these needs, companies are engaged in technology development aimed at improving display brightness. The switching of color resist material from pigments to dye-types is viewed as one method to improve LCD color filter brightness. However, dye-based color materials have only a low heat resistant temperature, making it difficult to use them in a stable format in color filter manufacture.
In this latest development, DNP has leveraged its original material technology to develop a blue color resist that maintains superior heat resistant features even while being a dye-based material. And in doing so, has successfully boosted brightness and transmittance rates of color filters. It is possible to use the new color resist without the need to alter current color filter manufacturing processes. In addition to launching sales of color filters that use this new color resist, DNP will also engage in related businesses, including technology support to help clients learn how to effectively use the new color resist. The Company will further propose optimal color filters for DNP optical film that is effective in expanding color gamut.
[Features of High-Luminance Blue Color Resist]
- By improving the transparency rate of the blue color that has relatively low brightness compared to other color resists, it has been possible to improve color reproduction for the overall panel, and efficiently improve brightness.
- The newly developed color resist boasts high heat resistance capable of withstanding the deposition temperatures in the color filter manufacture process, even while being a dye-based color resist.
- Compared to the pigment-based blue color resist, transmittance rates have been improved by 17%.
- By combining a color filter that uses the new color resist with an optimal backlight, it has been possible to effectively boost brightness, and limit the number of LEDs used, leading to energy savings. At the same time, the color reproduction gamut expands making it possible to express clearer natural color hues. For example, when using LED produced by Nichia Corporation, it is now possible to realize a color reproduction gamut with a 100% DCI cover rate.
Looking ahead, DNP will offer color filters using the newly developed dye-based color resist to panel makers, at the same time as marketing the color resist technology to panel makers that produce color filters on an in-house basis. The Company aims for a 30% share of the high resolution LCD display market in 2016. DNP will also forge ahead with the development of other dye-based color resists other than blue, such as red and green, looking to contribute to the realization of further high-resolution displays and the improvement of color reproduction.