A new system of CDT(Color Display Tube) yoke has been developed. In this system, not only the bulb cone and the horizontal and vertical coils of DY(Deflection Yoke), but also its core are transformed from a round shape to a substantially rectangular shape at the screen side of the DY. Owing to the reduction of the deflection current and the coil inductance, the deflection power has been reduced by 23% in comparison with a conventional round DY. and also, the 2M pixels display capability with 110kHz scanning frequency has been subsequently accomplished.
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.
In regard to local dimming LCD, we defined a new objective function to evaluate reproducibility both at higher and lower luminance based on human vision characteristics and optical characteristics of backlight and LCP. And we developed a local dimming algorithm that can combine higher luminance reproducibility and low power consumption. P-57 / R. Nonaka 1314 • SID 11 DIGEST
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