Yasuhisa Itoh

29.1: Polarizer-Free Reflective LCD Combined with Ultra Low-Power Driving Technology

We have developed a novel reflective LCD without polarizers, which is sure to provide excellent visibility (reflectance = 50%, CR = 10:1). Moreover, we have also achieved extremely low power consumption of 10 microwatts to introduce low frequency driving (less than 1Hz) without flicker and image sticking. These characteristics were realized to combine pixel memory circuit and new PNLC material.

53.3: New Color Filter Structures for Transflective TFT - LCD

We have developed the novel color filter structure suitable for our transflective ‘Advanced TFT-LCD’. In this paper, characteristics of the CF and display performance of improved ‘Advanced TFT-LCD’ with high display-quality are discussed.

16.2: Influence of rough surface upon optical characteristics of reflective LCD with a polarizer

We have developed bright 260,000-color “High Reflective TFT (HR-TFT)” liquid crystal display (LCD) with diffused “Micro Reflective Structure (MRS)” inside a panel. In this paper, influences of rough surface upon the optical characteristics of the reflective type LCD are discussed.

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

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.

80.3: Distinguished Paper: Ultra-Low-Reflective 60-in. LCD with Uniform Moth-Eye Surface for Digital Signage

We have developed an over 60-inch size Moth-eye anti-reflection surface, which has original shaped nanostructures. The minimum reflectance was 0.02% and the average was less than 0.04% with little wavelength dependence. Moreover an anti-glare function was added. The 60-inch LCD applied AG Moth-eye surface had an excellent visibility in bright environments.

80.2: 60‐inch Highly Transparent See‐through Active Matrix Display without Polarizers

For the first time, we have developed a 60-inch diagonal size see- through display using polymer network liquid crystal (PNLC) technology. The color display system by combination of the see- through display and a projector enables distinguishing eye-catch effect. It creates new application of displays, such as information display, digital signage and substitution of window.

35.4: Novel Transflective LCD with Micro-lens Array to Double the Brightness

A Novel transflective LCD has been developed with introducing a microlens array and a highly collimated backlight system. This new technology provides excellent visibility both outdoors and indoors without increasing power consumption of backlight.

P‐149: Super Reflective Color LCDs Being Able to Display Moving Images without Polarizers

Novel reflective color LCDs without polarizers have been developed with using PDLCs and retro-reflectors. By eliminating polarizers, brightness of our newly developed LCDs has been increased by 51% compared to conventional reflective LCDs, and there still is much room to be improved. Whats more, our LCDs can be displayed not only bright text images but also color moving images on, since their response time and driving voltage are significantly fast (63ms) and low (5.5 volts).

P‐69: Beyond RGB‐Primaries: Chromaticity Measurement Issues for Multi‐Primary Displays

The current standards of color gamut measurement regarding RGB-primary displays are not applicable to multi-primary color (MPC) display systems. We show two case studies that measurement performed by simply extending the use of todays RGB-based standards is not able to provide accurate evaluation of the color gamut of MPC displays. The color gamut of MPC displays depends on signal processing algorithm; therefore, for measuring the color gamut of MPC displays, we propose to use not only the input signals of the maximum values for respective colors but also medium-level signals which are able to measure the chromaticity of respective primary color points on MPC display.

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

— 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.