Casio Computer Co., Ltd.

Tsuyoshi Suzuki

Norihiro Arai

Kunpei Kobayashi

Toshiharu Nishino

Ryota Mizusako

Masaki Yanagisawa

Kazuhiro Sakai

A plurality of reflection films are provided behind a liquid crystal layer of a liquid crystal element, corresponding to predetermined regions in the plural pixels Pix. By the regions of the plural pixels wherein the reflection films are provided, reflection parts Pr are formed that reflects the light that enters from the front side and goes out to the front side by the region where the reflection film is provided, and transmission parts are formed that transmits the light that enters from the back side and goes out to the front side by the other regions of the plural pixels. At the same time, color filters, wherein a plurality of apertures are formed to the parts corresponding to the reflection pars Pr of the pixels Pix, are provided respectively corresponding to the plural pixels Pix, and a planarization transparent film covering the aperture is formed on these color filters.

Liquid crystal display device capable of transmission display and reflection display

A liquid crystal device of this invention is constituted by a display cell, a compensation cell, and a pair of polarizing plates. The display cell is designed such that electrodes are respectively formed on the opposing surfaces of a pair of substrates, arranged to oppose each other through a predetermined gap, to be perpendicular to each other, alignment films are respectively formed to cover the electrodes, and a first liquid crystal material is sealed between the substrates to be twisted at a predetermined angle. The compensation cell is arranged to be stacked on the display cell. The compensation cell is designed such that a second liquid crystal material is sealed between a pair of substrates, subjected to alignment processing, to be twist-aligned in a direction opposite to the twist direction of the first liquid crystal material. The pair of polarizing plates are arranged to sandwich the display and compensation cells. A refractive index anisotropy .DELTA.n.sub.1 of the first liquid crystal material is 0.18 or more, and a product .DELTA.n.sub.1 .multidot.d.sub.1 of the refractive index anisotropy .DELTA.n.sub.1 of a layer thickness d.sub.1 of the first liquid crystal material is 0.7 .mu.m or more. A product .DELTA.n.sub.2 .multidot.d.sub.2 of a refractive index anisotropy .DELTA.n.sub.2 and a layer thickness d.sub.2 of the second liquid crystal material is smaller than the product .DELTA.n.sub.1 .multidot.d.sub.1 of the first liquid crystal material.

Liquid crystal display device with display and compensation cells

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Machida, Japan

Tsuyoshi Suzuki