Kiyofumi Hashimoto

Reflective color display using cholesteric liquid crystals

A stacked-type reflective color display using cholesteric liquid crystals has been developed. The display has high luminance and 512-color capability. This device also has display-image memory features without a field owing to its intermediate multi-stability. We will discuss a new fast-addressing scheme and device construction to obtain intermediate stability and excellent color-display characteristics.

31.1: Invited Paper: Reflective Color Display Using Cholesteric Liquid Crystals

A stacked type reflective color display using cholesteric liquid crystals has been developed. The display has high luminance and 512 color capability. This device also has display image memory features without a field owing to its intermediate multi-stability. We will discuss a new fast addressing scheme and device constructions to obtain a intermediate stability and excellent color displaying characteristics.

67.1: Active Matrix Electronic Paper with Silver Electrodeposition

In recent years, many technologies relating to electronic paper and related products have been developed or proposed. But the gulf between the quality of electronic paper so far achieved and the merits of standard paper still exists. Many technological problems are yet to be solved, and we chose to focus on improving the display quality of electronic paper documents, which is very important to document readability. We developed a 3.5 inch sheet of electronic paper, driven by an active-matrix using silver electrodeposition, and, for an electronic paper, exhibiting the highest level of whiteness in the world. The electronic paper has a white reflectivity of over 60%, approaching that of copy paper, and a contrast ratio of at least 20:1, which together realize visibility equivalent to copy paper.

The Relationship Between Contact Angles and Characteristics of Ch-Liquid Crystal/Polymer Composite Films

Abstract The relations between contact angles of Ch liquid crystal / polymer interface and contrast ratios of the composite films are investigated. It is found that there is a correlation between contact angles and contrast ratios. But the correlation depends on materials of composite films.

Directional screen using binary optics

A binary phase grating that has a 2D periodic phase structure is useful to generate the directional diffuser. Recent analysis and computation for the periodically phase distributed plate will give the most optimized characteristics of the diffuser. This binary phase grating is successfully obtained, large enough, by a planar fabrication technique such as photolithography. Typical application of the phase grating for a clear and high efficiency focusing screen of the viewer is presented.