62.1: Five‐Primary‐Color 60‐Inch LCD with Novel Wide Color Gamut and Wide Viewing Angle

Ueki, Shun; Nakamura, Kozo; Yoshida, Yuhichi; Mori, Tomohiko; Tomizawa, Kazunari; Narutaki, Yohzoh; Itoh, Yoshio; Okamoto, Kenji

doi:10.1889/1.3256949

Cited by 36 publications

(23 citation statements)

References 7 publications

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“…() cannot be solved uniquely. To solve this problem, a number of methods have been proposed . Several methods calculate the intensity values of primary colors so as to improve the performance of the display.…”

Section: Dimming Of 4pc Led Backlightmentioning

confidence: 99%

“…Several methods calculate the intensity values of primary colors so as to improve the performance of the display. For example, they calculate the values to reduce power consumption of the display or to improve the viewing angle or resolution . In this paper, we calculate ( R LED ( i , j ), G LED ( i , j ), B LED ( i , j ), C LED ( i , j )) so that power consumption of the LEDs becomes the minimum.…”

Section: Dimming Of 4pc Led Backlightmentioning

confidence: 99%

“…To solve this problem, a number of methods have been proposed. [12][13][14][15][16][17][18] Several methods calculate the intensity values of primary colors so as to improve the performance of the display. For example, they calculate the values to reduce power consumption of the display 15,16 or to improve the viewing angle 17 or resolution.…”

Section: Local Dimming Algorithmmentioning

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: Dimming Of 4pc Led Backlightmentioning

confidence: 99%

Section: Dimming Of 4pc Led Backlightmentioning

confidence: 99%

Section: Local Dimming Algorithmmentioning

confidence: 99%

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

2012

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“…The use of narrowband primaries, however, also incurs two main disadvantages: observer metamerism, 1 and potential loss of efficiency with narrowband filters. As an alternative, the use of more than the traditional three primaries also allows expansion of the gamut, 2, 3 and brings benefits for power consumption, 4, 5 viewing angle, 6 among others.…”

Section: Introductionmentioning

confidence: 99%

Primary selection for uniform display response

Rodríguez-Pardo

Sharma

Feng³

2014

SPIE Proceedings

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Traditional methodologies for primary selection usually consider the optimization of parameters that characterize the global performance of the display system, such as the luminance of the white point, gamut volume, and power consumption. We propose a methodology for primary design that optimizes a figure of merit designed to favor gamuts for which maximum luminance at each chromaticity is uniformly related to the corresponding maximum luminance over the set of optimal colors. We contrast the results obtained with the proposed methodology with those obtained by an alternative strategy based on the optimization of gamut volume, and analyze differences in performance between these approaches for both three and four primary systems. Results indicate that the global vs local design choices result in significantly different primary designs.

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“…Also, new technologies such as multi-primary displays have been developed. 1,2 At the same time, not only HDTV standard images but also various standard images are produced; for instance, AdobeRGB defines highly saturated primaries. To widen the gamut near the spectrum locus, sYCC and xvYCC standards transfer colordifference signals equivalent to negative RGB signals.…”

Section: Introductionmentioning

confidence: 99%

Relationship between mode‐boundary from surface color to fluorescent appearance and preferred gamut on wide‐gamut displays

Fujine¹,

Kanda²,

Yoshida³

et al. 2010

J Soc Info Display

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Abstract— Color‐gamut design is a major concern in wide‐gamut displays. To determine a preferred gamut for displaying object color in natural scenes on a wide‐gamut display, subjective evaluations were conducted to investigate the preferred color and acceptable limit. Then, simple synthesized images were used to determine the mode boundary between surface color and fluorescent color appearance. It was found that (1) observers perceived the colors with high saturation and high lightness as fluorescent colors and (2) the fluorescent appearance decreased preference. The color‐mode index (CMI) was defined as an evaluation index of the color‐appearance mode so that the boundary between surface color and fluorescent color appearance was defined as CMI 100. Additionally, it was found that the CMI 100 loci could be interpreted as an optimal color loci. Then, it was clarified that the mode boundary and the preferred gamut were closely related and that the acceptable limit for L* was 1.1 times L* for CMI 100.

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62.1: Five‐Primary‐Color 60‐Inch LCD with Novel Wide Color Gamut and Wide Viewing Angle

Abstract: We have newly developed a 5‐primary‐color 60‐inch FHD LCD with pixels composed of R1CGR2BY six sub pixels. The prototype is designed to reproduce all of real surface colors. We have also improved its viewing angle performances by applying a multi‐primary color matching technology.

Cited by 36 publications

References 7 publications

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

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

Primary selection for uniform display response

Relationship between mode‐boundary from surface color to fluorescent appearance and preferred gamut on wide‐gamut displays

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