Color Gamut Comparison
Whereas current screens on mobile phones cover just 50% of NTSC color gamut on average,
Phono Fine Cromarich technology achieves 108% coverage, enabling faithful reproduction of colors like emerald green and yellowish green. |
The Mobile digital device market is rapidly going high resolution. Digital cameras that were able to snap pictures of 1 or 2 megapixels just a few years ago now operate at 5 or 6 megapixels as standard. Even mobile phone makers are producing handsets with cameras capable of capturing images of 2 megapixels and more. The same trend is happening in portable video-music players and phone viewers. All this is putting pressure on liquid crystal display (LCD) makers to come up with higher resolution screens able to accurately show an image as it is viewed by the eye, or as it can be reproduced by a printer. With its Photo Fine Chromarich wide-color-gamut LCDs, Epson Imaging Devices Corporation has achieved just that goal.
New low temperature polysilicon (LTPS) and amorphous silicon TFT displays incorporating Photo Fine Chromarich technology produce images with superior resolution and extended color range compared to standard displays, says Eiji Chino, a manager in the System Development Dept. at Epson Imaging Devices' Technology Development Division. "This makes for a clearer picture with richer colors, a wide viewing, angle, and fast response," he adds.
Close-up of the Newly
Developed Color Filter
The new LCDs feature four-color subpixels while maintaining the dot size of previous three-color-pixel displays.
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Available in 2.2-inch, 2.8-inch (both LTPS), and 4.5-inch (amorphous silicon) versions, the new displays incorporate four technological advancements to achieve the improved results: a four-color filter system, a larger aperture ratio for the filter system, a color management algorithm, and an improved backlighting unit.
Standard LCDs use red, green, and blue (RGB) filters to produce the color subpixels that combine to produce color images on the displays. In place of this arrangement, Seiko Epson and Epson Imaging Devices engineers have used red, blue, and two new green color filters (G1 and G2), which enable colors like emerald green and yellowish green to be reproduced at a level of naturalness not previously seen on small and medium-sized LCD screens.
At the same time, the engineers have extended the color range of both the red and blue filter materials, enabling them to register a wider range of red and blue tones. "With these improvements, we have greatly expanded the color gamut. The subset of colors that can be displayed," says Chino. Whereas current liquid crystal screens on mobile phones cover around 50 percent of the NTSC* color gamut that is used as a standard for such products, Photo Fine Chromarich technology "lets us extend the color gamut to 108-percent coverage," Chino pointes out.
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