56.3: 65‐inch, Super Slim, Laser TV with Newly Developed Laser Light Sources

Sugiura, Hiroaki; Sasagawa, Tomohiro; Michimori, Atsushi; Toide, Eiichi; Yanagisawa, Takayuki; Yamamoto, Shûhei; Hirano, Y.; Usui, Mitsuko; Teramatsu, Shigenori; Someya, Jun

doi:10.1889/1.3069805

Cited by 24 publications

(12 citation statements)

References 3 publications

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“…One approach involves expanding the color gamut formed by the three primary colors (red, green, and blue). This approach obtains three highly saturated primary colors with narrow spectral band by using LED backlight or laser light source . However, it reduces light efficiency, and it is difficult to cover all the colors in the real world by the only three primary colors.…”

Section: Introductionmentioning

confidence: 99%

“…This approach obtains three highly saturated primary colors with narrow spectral band by using LED backlight 2 or laser light source. 3,4 However, it reduces light efficiency, and it is difficult to cover all the colors in the real world by the only three primary colors. The other approach involves adding other primary colors to the three primary colors.…”

Section: Introductionmentioning

confidence: 99%

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Wide gamut LCD using locally dimmable four‐primary‐color LED backlight

2012

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This paper proposes a wide gamut LCD using locally dimmable four‐primary‐color (4PC) LED backlight. Although the color gamut of LCDs has been improved in recent years, it is insufficient to reproduce all the colors in the real world. The objective of this paper is to propose a wide gamut LCD that reproduces all the colors in the real world while keeping the cost increases to a minimum. We evaluated the color gamut reproduced by LEDs of multiple primary colors and selected cyan as the optimal color to be added to the three primary colors to reproduce all the colors in the real world. Therefore, we designed an LED backlight consisting of an additional only‐cyan LED with three‐primary‐color LEDs and developed a prototype LCD with 4PC LED backlight. Furthermore, we developed a local dimming algorithm for the 4PC LED backlight. As a result, we confirmed that the prototype LCD with the 4PC LED backlight is able to cover almost all the colors in the real world and also able to display natural images with highly saturated colors by local dimming.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wide gamut LCD using locally dimmable four‐primary‐color LED backlight

2012

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“…Instead of conventional discharge lamps, which have been used as a light source for projectors for a long time, solid-state light sources such as lasers and LEDs recently have begun to be used. [1][2][3][4] Although these two types of solidstate light sources share similar features, such as high color purity, long-lifetime mercury-free lasers are more suitable for high-brightness projectors due to their significantly higher luminance and lower étendue. In particular, high luminance, small étendue and high color purity are significant advantages of lasers when trying to produce a projector that meets the demands of the high-end projector market.…”

Section: Introductionmentioning

confidence: 99%

High‐efficiency optical system for ultra‐short‐throw‐distance projector based on multi‐laser light source

et al. 2011

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Abstract— A novel laser‐light‐source projector having the three outstanding features of high brightness, ultra‐short throw distance, and high color reproduction has been developed.These features have recently come to be required in the high‐end projector market. The technologies for the laser‐light‐source projectors fully utilize the advantages of lasers, such as high luminance, small étendue, and high color purity. By integrating a triple‐rod illumination system with a multi‐laser light source and an ultra‐wide‐angle projection system, the developed high‐efficiency optical system has achieved a brightness of 7000 lm and a throw ratio of 0.28 with an image size of 100–150 in. Another new technology, laser color processing (LCP), has offered vivid color reproduction which has a color gamut that is up to 180% wider than the BT.709 standard without appearing unnaturally colored. Furthermore, a speckle suppression effect produced by the multi‐laser light source has been demonstrated. In this paper, an overview of these newly developed technologies that are used in the novel laser‐light‐source projector is presented, and solutions to the issues of speckle noise and safety are presented.

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“…Various ways of achieving wide-color-gamut display devices have recently been proposed. [4][5][6][7][8][9][10][11] They are briefly divided into two categories. One approach is to simply expand the color gamut, which is based on three primary colors (red, green, and blue: RGB), for example, by using RGB-LED backlight systems on liquid-crystal-display (LCD) TVs 4 or developing laser displays.…”

Section: Introductionmentioning

confidence: 99%

“…One approach is to simply expand the color gamut, which is based on three primary colors (red, green, and blue: RGB), for example, by using RGB-LED backlight systems on liquid-crystal-display (LCD) TVs 4 or developing laser displays. 5 Generally, RGBbased display systems have a limitation which sacrifices efficiency as long as expanding their color gamut. Some methodologies expand the color gamut by narrowing the spectrum of backlight sources such as LED or laser displays.…”

Section: Introductionmentioning

confidence: 99%

Multi‐primary‐color LCD: Its characteristics and extended applications

Tomizawa¹,

Nakamura²,

Ueki³

et al. 2011

J Soc Info Display

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Abstract— The development of multi‐primary‐color (MPC) display systems is one of the big paradigm shifts in recent display technologies and induces new potentials of display devices. The development of MPC display systems for different goals is briefly reviewed. Especially, by employing MPC systems, it is possible to reproduce the real material colors faithfully and efficiently. For signal processing, MPC systems have a big advantage in the so‐called color‐reproduction redundancy. A number of applications can be derived from this characteristic, such as improving the viewing‐angle dependency issue and power savings. On the other hand, MPC systems have a typical trade‐off versus RGB‐standardized input signals, especially for reproducing bright green. New algorithms to moderate this trade‐off on MPC systems by employing color‐reproduction redundancy are proposed. The goal of our algorithms is to maintain the compatibility with RGB‐based input signals though the initial display design so that the characteristics of MPC systems are not changed or lost. These algorithms indicate that MPC display systems are applicable not only for a specifically limited objective but also for other applications, e.g., TV broadcasting.

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56.3: 65‐inch, Super Slim, Laser TV with Newly Developed Laser Light Sources

Cited by 24 publications

References 3 publications

Wide gamut LCD using locally dimmable four‐primary‐color LED backlight

Wide gamut LCD using locally dimmable four‐primary‐color LED backlight

High‐efficiency optical system for ultra‐short‐throw‐distance projector based on multi‐laser light source

Multi‐primary‐color LCD: Its characteristics and extended applications

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