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Mitsubishi Electric Develops LCD Monitor with 6 Color LED Backlight
Mitsubishi Electric Corp. has developed an LCD monitor using light-emitting diodes (LED) of six different colors as a backlight. The range of color reproduction extends to 119% compared to the company's prototype with a 3 color LED backlight, and to 181% compared to the sRGB standard. The LCD monitor can display 95.58% of the Munsell Color Cascade, a series of natural object color samples. The conventional product using a 3 color LED backlight could only display 80.62% of the Munsell Color Cascade and 52.67% of the sRGB standard.
The peak wavelength of each LED is 410 nm (B2), 430 nm (B1), 510 nm (G1), 540 nm (G2), 615 nm (R2) and 625 nm (R1). These LEDs are divided into two groups, and frames consisting of R1, G1 and B1 LEDs and those containing R2, G2 and B2 LEDs are lit in sequence. This technology is called field sequential. The LCD panel's subpixels and 3 color filters respond to these 3 color LEDs lit in each field. Mitsubishi employed the technology, because "It allows us to expand the color reproduction range using the conventional LCD panel, without modifying the resolution structure and the color filter." The LEDs are products manufactured by Lumileds Lighting, LLC. of the US, and 26 LEDs of each R1, R2, B1 and B2, and 56 LEDs of each G1 and G2 are used. The backlight part's power consumption is 60 W.
The prototype LCD is a 23-inch monitor with the resolution of 1,280 x 768 pixels. The luminance is 80 cd/m2. It features a proprietary circuit that converts RGB signals into those compliant with 6 primary colors. The LCD panel also features another circuit that adjusts the LEDs' color change due to factors such as temperature and time.
[RANK="techon.nikkeibp.co.jp/english/NEWS_EN/20050511/104550/"]Source[/RANK]
Mitsubishi Electric Corp. has developed an LCD monitor using light-emitting diodes (LED) of six different colors as a backlight. The range of color reproduction extends to 119% compared to the company's prototype with a 3 color LED backlight, and to 181% compared to the sRGB standard. The LCD monitor can display 95.58% of the Munsell Color Cascade, a series of natural object color samples. The conventional product using a 3 color LED backlight could only display 80.62% of the Munsell Color Cascade and 52.67% of the sRGB standard.
The peak wavelength of each LED is 410 nm (B2), 430 nm (B1), 510 nm (G1), 540 nm (G2), 615 nm (R2) and 625 nm (R1). These LEDs are divided into two groups, and frames consisting of R1, G1 and B1 LEDs and those containing R2, G2 and B2 LEDs are lit in sequence. This technology is called field sequential. The LCD panel's subpixels and 3 color filters respond to these 3 color LEDs lit in each field. Mitsubishi employed the technology, because "It allows us to expand the color reproduction range using the conventional LCD panel, without modifying the resolution structure and the color filter." The LEDs are products manufactured by Lumileds Lighting, LLC. of the US, and 26 LEDs of each R1, R2, B1 and B2, and 56 LEDs of each G1 and G2 are used. The backlight part's power consumption is 60 W.
The prototype LCD is a 23-inch monitor with the resolution of 1,280 x 768 pixels. The luminance is 80 cd/m2. It features a proprietary circuit that converts RGB signals into those compliant with 6 primary colors. The LCD panel also features another circuit that adjusts the LEDs' color change due to factors such as temperature and time.
[RANK="techon.nikkeibp.co.jp/english/NEWS_EN/20050511/104550/"]Source[/RANK]