Hitachi, Ltd.

Other

Hitachi Maxell, Limited

Hitachi, Ltd., and Hitachi Video and Information Systems, Inc.

Hitachi Consumer Electronics Co., Ltd.

Takashi Kakuda

Masaharu Deguchi

Yutaka Matsuda

Takesuke Maruyama

Futoshi Yamasaki

Masahiko Yatsu

Naohiro Ozawa

Takuya Shiaki

Nobuyuki Kaku

Atsushi Ishibashi

Shigehisa Hagura

Yasuo Otsuka

Takeshi Hoshino

Tomohiro Miyoshi

Kenji Fuse

Satoshi Ohuchi

Makoto Fukatsu

Seiichi Sekiguchi

Mikiharu Kuwata

Nobuhiko Konuma

Hidetomo Yoshimura

Koichi Umezawa

Yoshio Ariki

Satoshi Ouchi

Nobuhiro Konuma

Hisao Inage

Naohiro Konuma

Koji Hirata

Nobuyuki Kimura

Takanori Hisada

Yutaka c/o Hitachi Ltd Matsuda

Hisao Inaga

The purpose of the present invention is to provide a projection image display device in which all of the multiple light sources to be used are positioned optimally, regardless of the mode of installation of the device. This projection image display device has two illumination optical systems () that are each provided with a light source (), a color separator for separating into three colors of light, a liquid crystal panel () for forming an optical image, and a color synthesis prism () for color-synthesizing. A polarization beam splitter () for synthesis synthesizes an optical image formed by the illumination optical system (), and projects the same from a projection lens (). The optical axis () of each light source () is positioned within the same plane as the optical axis () of the projection lens (), and so as to orthogonally intersect the optical axis () of the projection lens.

Projection image display device comprising a plurality of illumination optical systems

A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for supplying power to the light source. The projection lens unit, the color separating optical system, the illuminating optical system and the light source power supply are arranged in that order. The liquid crystal projector has an outside size in a horizontal plane of 263 mm by 318 mm or below. The liquid crystal panels have a display screen size of 0.9 in. A cooling fan for cooling the plurality of liquid crystal panels is disposed beside the projection lens.

Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same

A projection type liquid crystal display device, including: irradiation means having a function of irradiating light emitted from a light source upon an irradiated surface; a liquid crystal display element for modulating the light; and projection means for projecting the light emitted from said liquid crystal display element, wherein said irradiation means comprises: at least one reflection mirror; a polarization beam splitter for dividing the light from the light source into P polarization light and S polarization light; a &lgr;/2 phase shifting plate for rotating a direction of polarization of either one of the P polarization and S polarization lights; polarization means being constructed with a reflection mirror for reflecting either one of the P polarization and S polarization lights; a first lens array being constructed with a plurality of condenser lenses, for collecting the light emitted from said polarization means so as to form a plurality of secondary light source images; and a second lens array being constructed with a plurality of condenser lenses and positioned in vicinity of where the plurality of secondary light source images are formed.

Projection type liquid crystal display device

A projection type liquid crystal display device using liquid crystal display elements, which has a light source; illumination optics having a function of irradiating a plane to be irradiated with light emitted by the light source; and liquid crystal display elements modulating light; projection optics for projecting light exiting from the liquid crystal display elements; wherein the illumination optics include at least an elliptic mirror and a spherical mirror, and the illumination optics include further a first lens array and a second lens array, in which a plurality of lenses are arranged perpendicularly to an optical axis, from the light source side; and a condenser lens for irradiating the liquid crystal display elements with light after exit from the second lens array with a high efficiency. In this way it is possible to realize a bright projection type liquid crystal display device having a small size and a good image quality performance.

A liquid crystal projector, having a configuration in which an exhaust fan is arranged adjacently to a projection lens at an angle to the optical axis of the projection lens, a configuration including a plurality of tilted wind-directing plates, a configuration in which the arrangement of a first reflection mirror, a first lens array, a light source and the exhaust fan is substantially parallel and adjacent to the arrangement of the projection lens, a dichroic prism and a second dichroic mirror, and/or a configuration in which the lens array has the incident surface thereof made of a concave lens.

Liquid crystal projector

A projection type liquid crystal display device, including: irradiation means having a function of irradiating light emitted from a light source upon an irradiated surface; a liquid crystal display element for modulating the light; and projection means for projecting the light emitted from said liquid crystal display element, wherein said irradiation means comprises: at least one reflection mirror; a polarization beam splitter for dividing the light from the light source into P polarization light and S polarization light; a .lambda./2 phase shifting plate for rotating a direction of polarization of either one of the P polarization and S polarization lights; polarization means being constructed with a reflection mirror for reflecting either one of the P polarization and S polarization lights; a first lens array being constructed with a plurality of condenser lenses, for collecting the light emitted from said polarization means so as to form a plurality of secondary light source images; and a second lens array being constructed with a plurality of condenser lenses and positioned in vicinity of where the plurality of secondary light source images are formed.

A liquid crystal display includes an illumination optical system which has a light source for emitting light and acts to irradiate the light from the light source on a light bulb on which an optical image is formed in accordance with a video signal, and a transmission-type liquid crystal display element for displaying the image information by the electrooptical effect of the liquid injected between a pair of transparent substrates of the light bulb. The liquid crystal display element is formed of a micro-lens array which has unit lenses provided to oppose the respective picture elements of the picture element array of the liquid crystal and thus to have the same array as the picture element array of the liquid crystal. Since this micro-lens array is closely attached to the side of liquid crystal display element to which the luminous flux emitted from the light source is incident, or integrally formed within the liquid crystal cell substrate, the liquid crystal display element has a high aperture ratio.

Liquid crystal display element and micro-lens arrangement and a display

A bulb (4) of lamp (1) has a reflection film (2) or reflection mirror (9) to make light components going outside a reflector (3) direct to the reflector (3) to reflect. If the lamp (1) is a spot light source, a light emission center is positioned at a center of spherical reflection mirror (9). If the lamp (1) is not a spot light source, the reflection mirror (9) is made ellipsoid and at its two focal points, ends of two light emitting electrodes are positioned. Also, the lamp (1) having the reflection mirror (9) is used in the illumination unit for a liquid crystal display apparatus to increase the brightness of the image projected onto the screen (26). Further, the liquid crystal display device (23) has within a liquid crystal display device (23) a microlens array for collecting the incoming light into an area of each picture element electrode (39) to increase the light utilization efficiency of the liquid crystal display device (23).

Illumination unit for liquid crystal projection display apparatus and

A liquid crystal display includes an illumination optical system which has a light source of emitting source on a light valve on which an optical image is formed in accordance with a video signal. A transmission-type liquid crystal display element is used to display the image information by the electrooptical effect of the liquid injected between a pair of transparent substrates of the light valve. The liquid crystal display element is formed of a micro-lens array which has unit lenses provided to oppose the respective picture elements of the picture element array of the liquid crystal and thus to have the same array as the picture element array of the liquid crystal. The micro-lens array is proximate to the side of liquid crystal display element to which the luminous flux emitted from the light source is incident, or integrally formed within the liquid crystal cell substrate so that the liquid crystal display element has a high aperture ratio. The light source or the concave mirror is shaped similar to the shape of the aperture of the liquid crystal display element.

Liquid crystal display with pixel shape same as image of light source

Growing community of inventors

Yokohama, Japan

Takashi Kakuda