Hitachi, Ltd.

Jun-ichi Hirakata

Katsumi Kondo

Ikuo Hiyama

Yuji Mori

Naoki Kikuchi

Masaya Adachi

Makoto Tsumura

Osamu Itoh

Yoshiharu Nagae

Kiyoshige Kinugawa

Hideaki Kawakami

Satoru Ogihara

Masato Isogai

Yasuhiko Kando

Shuichi Ohara

Tatsuhisa Fujii

Katuyuki Hunahata

A liquid crystal display device includes an illumination device, a light control element arranged at a projected light side of the illumination device, a reflective polarizer arranged at an upper portion of the light control element so that the transmission axis of polarized light is adjusted, a liquid crystal display element for controlling polarization of projected light projected from the reflective polarizer, and a screen arranged at an upper portion of the liquid crystal display element. The light control element includes an isotropic medium without birefringence.

Liquid crystal display device

In order to realize liquid crystal display devices having a wide viewing angle and reduce the absorption loss by polarizers and color filters, and arrangement of reflective color selective means, reflective polarizing selective means, a light control element, and others are specified. The liquid crystal display device able to produce a display of high performance and improved brightness is formed of liquid crystal display elementsfor controlling polarizing light so that the major axis direction of a pixel is arranged approximately in parallel with a direction wherein the linearly polarized light component of the projected light projected from said illumination device is high; an illumination devicearranged at a rear plane of the liquid crystal display element; a reflectorarranged at a rear plane of the illumination device; light control elementsand reflective polarizing selective meansarranged between the liquid crystal display element and the illumination device; and a screen arranged at an opposite side relative to the illumination device of the liquid crystal display element.

Liquid crystal display device having particular reflective polarizer

A reflective liquid crystal display device has a liquid crystal cell formed by laminating upper and lower orientation layers 11 and 21, upper and lower electrodes 14 and 24, upper and lower substrates 12 and 22, and upper and lower polarizers 13 and 23 arranged in order above and below a liquid crystal layer 10 so that they may face their counterparts respectively. The liquid crystal cell is provided with viewing angle dependence so that the light transmission ratio of the dark display section to the bright display section for the light incident at the required angle may be less than 2 at the required azimuth angle of the liquid crystal cell, and the direction of the required azimuth angle is aligned with the direction of the main light source incident into the liquid crystal cell.

Reflective liquid crystal display device

A display device, which is adapted for time-division driving and is free from occurrence of crosstalk, includes a pair of substrates which are arranged to be opposite to each other and at least one of which is transparent, electrodes provided respectively on surfaces of the substrates facing each other, and a material which is sandwiched between the electrodes and the light transmitting quantity of which is changed by an electric field applied between the electrodes. The electrodes formed on the surfaces of the substrates facing each other constitute scanning electrodes and signal electrodes which intersect each other to form display portions. The signal electrodes constitutes independent electrodes formed independently of each other in units of display portions. Outside leads of the respective independent electrodes are passed through the substrate provided with the electrodes and are led out to the back surface of the substrate.

Dot-matrix type display device

A liquid crystal display device is disclosed, which comprises a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to the first substrate, and a nematic liquid crystal layer disposed between the first substrate and the second substrate; a first polarizer disposed outside of the first substrate; a second polarizer disposed outside of the second substrate; and at least one optically anisotropic layer disposed at least one of between the first substrate and the first polarizer and between the second substrate and the second polarizer. The twist angle of the nematic liquid crystal layer is greater than 180.degree.; and the following conditions are fulfilled: ##EQU1## where .DELTA.n.sub.LC represents a birefringence of the nematic liquid crystal; d.sub.LC a thickness of the nematic liquid crystal layer; .DELTA.n.sub.i a birefringence of the optically anisotropic layer; d.sub.i a thickness of the optically anisotropic layer; and m a number of optically anisotropic layers.

Supertwisted, nematic liquid crystal display device with LC

In a liquid crystal display device, light transmitting through a liquid crystal layer is colored depending on the structural conditions of the liquid crystal display device. The phase of the transmission light is corrected by means of a phase correction plate to make the transmission light approximate achromatic color, thereby permitting monochromatic display or color display.

Liquid crystal display device using nematic liquid crystal having

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Hitachi, Japan

Jun-ichi Hirakata