Sharp Kabushiki Kaisha Corporation

Other

Masahiko Tomikawa

Kiyoshi Minoura

Shun Ueki

Seiichi Mitsui

Masayuki Okamoto

Teiyu Sako

Mitsuhiro Shigeta

Eiji Satoh

Tomoko Teranishi

Yasuhisa Itoh

Nobuyuki Itoh

Shuji Miyoshi

Hideki Uchida

Hisashi Akiyama

The reflective display device of the invention includes: a display layer; an optical element placed on an observer side of the display layer; and a reflection element placed on a side of the display layer opposite to the observer side. The optical element has a principal plane including a plurality of tilt faces tilted with respect to the display plane. Light incident on the display layer through the optical element and reflected by the reflection element is allowed to outgo in a direction roughly normal to the display plane.

Reflective display device and prism array sheet

In a luminous display element, a retro-reflector is provided on the back side of an organic EL layer which includes an emission layer whose state changes between an emission state and a non-emission state. The retro-reflector includes a corner cube array, and reflects incident light in the same direction as an incident direction. A unit structure of the corner cube array is a form of a triangular pyramid which is made up of rectangular equilateral triangles having three faces, and a light shielding process is performed on the periphery of a base angle of the rectangular equilateral triangle. Thus, it is possible to prevent an image from being reflected, so that it is possible to provide the luminous display element whose contrast ratio and the utilization efficiency of emission are high.

Luminous display element

A reflective display device includes a switching layer, placed between substrates, for switching between a transmissive state for allowing transmission of incident light and a scattering state for scattering the incident light, and a retro-reflector for reflecting an incident ray from the liquid crystal layer so that an outgoing ray of the reflected light is parallel to the incident ray. A pitch of smallest unit structures of the retro-reflector is set to be larger than 0 mm and not more than 5 mm. The retro-reflector is preferably in a form of a corner cube array and has light absorbing surface portions at borders of the smallest unit structures. With this reflective display device, brightness of white state and contrast ratio can be improved.

Reflective display device and retro-reflector used therefor

An optical element includes first and second members. The first member has a first surface including a first concave portion. The second member has a second surface including a second concave portion and transmits incoming light therethrough. The first and second members are disposed so that the first and second surfaces are opposed to each other. First and second reflective regions have been formed on the first and second concave portions, respectively. At least part of the incoming light that has been transmitted through the second member is reflected from at least one of the first and second reflective regions.

Optical element like corner cube retroreflector and reflective display device including such an optical element

Luminous display element including an optical member for reflecting light in a direction opposite to an incident direction

A display device includes a reflector in which a plurality of elements, each including a number of reflective regions, is arranged. In the reflector, the reflective regions of each said element are disposed so that at least part of incoming light, which has been incident on the element, is reflected by each one of the reflective regions after another and then allowed to go out of the element. At least one of the reflective regions of each said element includes: a light reflective plane; and a light modulating layer that is formed on one side of the light reflective plane so as to face the incoming light.

Display device

To manufacture at a good yield a large-screen display having low resistivity of wires and excelling in flatness of substrates, a metal material, a transparent electrode material, and a conductive resin are used for forming either scanning electrodes or signal electrodes, or both of the same. Not less than two materials are used as the metal material, while amorphus ITO is used as the transparent electrode material. An electrode substrate has electrode structures in each of which a metal wire made of the foregoing metal material, a transparent electrode made of the foregoing transparent electrode material, and a conductive resin layer are laminated in this order on a transparent substrate. Conductivity is imparted to the conductive resin layers by conductive particles electrodeposited by the micell electrolytic method.

Growing community of inventors

Funabashi, Japan

Masahiko Tomikawa