Eiji Kaneko

Directly addressed matrix liquid crystal display panel with high information content

Abstract The present states of two refreshing type matrix LCD (liquid crystal display) panels are discussed. The present multiplexing limit of the TN-FE (twisted nematic-field effect) mode matrix LCD panel is about 400 rows using a divided signal electrode configuration. Above this limit, the SBE (super twisted birefringency) display panel should be applicable if presentation of colored images is not a problem.

A new fabrication technology for very-large-area TFT-LCDs

Abstract Display areas of direct-view type thin film transistor-addressed liquid crystal displays (TFT-LCDs) have been getting larger every year. At present, 10.4in diagonal high-resolution TFT-LCDs with (640 × 480) pixels are commercially available. However, a display area with a greater than 40in diagonal is required to observe high-definition TV (HD-TV) images with much sense of presence. This paper discusses why a large-area LCD is required and how such a display is fabricated using a new printing technology.

A Monochromatic Black and White Supertwisted Nematic Liquid Crystal Display with a Single Cell and a Birefringent Film

To achieve a monochromatic black-and-white (B/W) STN-LCD with a single cell and a birefringent plastic film, the optimum conditions of optical properties in the birefringent film are analyzed theoretically and experimentally. By optimizing the film retardation to minimize the transmission of a STN-LCD at 550 nm, optical retardation in a STN cell is canceled and a B/W STN-LCD is obtained. By selecting the suitable conditions for compensating retardation of the STN cell, a B/W STN-LCD is achieved with the contrast ratio of 10:1.

Brightness uniformity in liquid crystal television display

Abstract A liquid crystal matrix display has been developed for television. It has a larger panel size and a larger number of dots than liquid crystal displays for calculators and watches. However, it has been difficult to display intermediate grey areas with uniform brightness. The conditions necessary to obtain uniform brightness are discussed.

Multi-colour laser-addressed liquid crystal projection display

Abstract A multi-colour, large-screen (2 m x 2 m, 2000 x 2000 pixels) laser-addressed liquid crystal (LC) projection display is constructed which has three LC cells corresponding to the three primary colours. Only one f-θ lens and one projection lens are used. To increase brightness, two dichroic mirrors and an off-axis projection lens are employed in the projection system.

On magnetic path saturation in thin‐film heads

The distribution of magnetic field in the head gap and of flux density in in the magnetic path of thin‐film recording heads has been studied. It is shown that magnetic path saturation occurs first at the back end of the heads, which reduces efficiency. The relations which calculate the minimum current amplitude at magnetic path saturation are obtained. Results of the study are applied to thin‐film heads having two‐turn coils.