Alps Electric Co., Ltd.

Kenji Omote

Mitsuru Kano

Katsumasa Yoshii

Tatsuya Moriike

Tomomasa Takatsuka

Mitsuo Ohizumi

Yoshihiko Ishitaka

Yorihiko Sasaki

Takashi Date

The present invention provides a reflector having a light-diffusing property which suppresses inter-object reflection over a wide angle, and giving particularly high reflectance in an intended range of viewing angle; and to provide a reflection type liquid crystal display device using the same. The reflector includes a plurality of light-reflective concave portions. Each of the concave portions is formed so that an inclination angle (an angle between a plane tangential to a point on a concave surface and the surface of the base material) is maximum on a side portion of the curved surface, and so that the direction of the side portion having the maximum inclination angle is on a far side from a view point of an observer.

Reflector providing particularly high reflectance in an intended viewing angle and reflection type liquid crystal display device using the same

The present invention provides a reflector having a light-diffusing property which suppresses inter-object reflection over a wide angle, and giving particularly high reflectance in an intended range of viewing angle; and to provide a reflection type liquid crystal display device using the same. The reflector includes a plurality of light-reflective concave portions. Each of the concave portions is formed so that an inclination angle (an angle between a plane tangential to a point on a concave surface and the surface of the base material) is maximum on a side portion of the curved surface, and so that the direction of the side portion having the maximum inclination angle is on a far side from a view point of an observer. Moreover, the reflector includes many concave portions formed on a reflector surface, an inner surface of each of the concave portions-including a peripheral curved surface and a bottom curved surface that are continuously connected to each other, the peripheral curved surface being a part of a first sphere having a first radius, the bottom curved surface being a part of a second sphere having a second radius different from the first radius, and the bottom curved surface being located within the peripheral curved surface, wherein the first radius is smaller than the second radius, and a normal line extending from a center of the first sphere to the reflector surface and a normal line extending from a center of the second aphere to the reflector surface are not collinear. Further, the reflection type liquid crystal display device is provided with the reflector.

The present invention provides a reflector having a light-diffusing property which suppresses inter-object reflection over a wide angle, and giving particularly high reflectance in an intended range of viewing angle; and to provide a reflection type liquid crystal display device using the same. The reflector includes a plurality of light-reflective concave portions. Each of the concave portions is formed so that an inclination angle (an angle between a plane tangential to a point on a concave surface and the surface of the base material) is maximum on a side portion of the curved surface, and so that the direction of the side portion having the maximum inclination angle is on a far side from a view point of an observer. Moreover, the reflector includes many concave portions formed on a reflector surface, an inner surface of each of the concave portions including a peripheral curved surface and a bottom curved surface that are continuously connected to each other, the peripheral curved surface being a part of a first sphere having a first radius, the bottom curved surface being a part of a second sphere having a second radius different from the first radius, and the bottom curved surface being located within the peripheral curved surface, wherein the first radius is smaller than the second radius, and a normal line extending from a center of the first sphere to the reflector surface and a normal line extending from a center of the second sphere to the reflector surface are not collinear. Further, the reflection type liquid crystal display device is provided with the reflector.

Light-reflective concave portions are disposed on the surface of a substrate. The concave portions have a first and second vertical section perpendicular to each other. The first vertical section has an internal shape defined by a first curve and a second curve, the first curve extending from one point on the peripheral edge of the concave portion to the deepest point of the concave portion, and the second curve extending continuously from the first curve and from the deepest point of the concave portion to another point on the peripheral edge of the concave portion. The average of the absolute value of an inclination angle of the first curve is larger than that of the second curve relative to the substrate surface. The second vertical section has an internal shape defined by a shallow curve and deep curves formed at both sides of the shallow curve.

Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same

A reflector and reflector-type LCD suppresses inter-object reflection over a wide angle, and provides particularly high reflectance in an intended range of viewing angle. The reflector includes a plurality of concave portions with an inclination angle (an angle between a plane tangential to a point on a concave surface and the surface of the base material) that is maximum on a side portion of the curved surface. The concave portions may also be formed such that an inner surface of each of the concave portions include a peripheral curved surface and a bottom curved surface are continuously connected to each other. The peripheral curved surface and the bottom curved surface are interposed partial spheres having different radii and non-collinear normal lines from the surface of each sphere.

The present invention provides a reflection type liquid display device that does not cause defects such as a short circuit between a metallic reflection film and an electrode layer that are laminated on the substrate, a break in the electrode layer, and that can be easily manufactured because the alignment of elements is easily conducted. The reflection type liquid display device according to the present invention comprises a pair of substrates, a sealing member sandwiched by the pair of substrates, and liquid crystal sealed in a space surrounded by the sealing member and the pair of substrates, and is characterized in that many depressions and projections are formed on the surface of one substrate of the pair of substrates and a metallic reflection film and a flattening film are laminated on the depressed and projected surface, and that many depressions and projections are formed on the surface of the substrate at least other than an electrode terminal forming region and the surface of the substrate is made flat in the electrode terminal forming region.

Reflection type liquid crystal display device

A reflective type liquid crystal display of this invention comprises a reflector member having corrugated surface stored therein; an overcoat layer formed on the corrugated surface of the reflector member for making the corrugated surface flat; and a color filter layer formed on the overcoat layer, and wherein a thickness of the overcoat layer is more than twice of a depth of the concave part in the corrugated surface of the reflector member.

Liquid crystal display with corrugated reflective surface

A plurality of reflectors respectively having the same rough reflecting surfaces are formed substantially simultaneously on a transparent substrate of a large area. A photosensitive resin film is formed on a surface of a transparent substrate. An embossing die having a rough working surface is pressed against a photosensitive resin part of the photosensitive resin film and the photosensitive resin part is irradiated with ultraviolet rays from below the transparent substrate to form a prehardened photosensitive resin part. Those steps are repeated to form a plurality of prehardened, embossed photosensitive resin parts on the transparent substrate, and then parts not prehardened of the photosensitive resin film are removed by etching. The prehardened, embossed photosensitive resin parts are heated for hardening, and a metal reflecting film is formed on the hardened embossed photosensitive resin parts to complete a plurality of reflectors.

Growing community of inventors

Fukushima-ken, Japan

Kenji Omote