Fujitsu Corporation

Sharp Kabushiki Kaisha Corporation

Fujitsu Display Technologies Corporation

Fujitsu Kasei Limited

Fumiaki Yamada

Shinpei Nagatani

Masaki Miyahara

Toshihiro Suzuki

Tetsuya Kobayashi

Tetsuya Hamada

Keiji Hayashi

Mari Sugawara

Eiji Nittou

Motohiko Fukuhara

Yasutake Furukoshi

Masanori Nishido

Toshiaki Naka

Hidefumi Yoshida

Kazutaka Hanaoka

Akira Tanaka

Hideaki Tsuda

Eietsu Takahashi

Kimiaki Nakamura

Noboru Wakatsuki

Takeshi Gotoh

Katsunori Tanaka

Seiji Hayashimoto

Fumio Kokubo

Koshu Yonemura

Hisashi Sawada

Haruo Sorimachi

Masuji Sato

Shota Inoue

Eiji Kurimoto

Hiroyoshi Takahashi

Minoru Terashima

Kazumasa Kaiwa

Ryoji Ishimura

Tohru Hanaoka

Takehisa Takoshima

Takeo Kanno

Kiyoshi Sato

An object of the present invention is to obtain a display device having excellent display quality by appropriately modifying the chromaticity of images. In this display device, a correction processing part (CPU) determines a first chromaticity change amount stored in memory () on the basis of a first cumulative usage amount, which is the cumulative usage amount of an LED () up to a present time, the cumulative value having been measured by a counter (), and the correction processing part also determines a second chromaticity change amount stored in the memory () on the basis of a second cumulative usage amount, which is the cumulative usage amount of the LED () up to a time when the chromaticity of a pixel is adjusted by a chromaticity adjusting part (CPU), the cumulative value having been measured by the counter (). Then, by subtracting the second chromaticity change amount from the first chromaticity change amount, the correction processing part obtains the value to which the chromaticity is to be modified, and modifies an image signal on the basis of the value to which the chromaticity is to be modified.

Display device and television receiver

A liquid crystal display device including an LCD panel modulating light transmissivities of plural pixels disposed in a matrix form on the basis of respective gradation data; an illumination device for irradiating light to the respective pixels while a ratio (duty ratio) of a lighting time in one frame period is changed; and a display data conversion part for calculating respective lightnesses and a lightness histogram from the respective gradation data, determining a threshold lightness from the lightness histogram on the basis of a previously determined ratio of pixels to be saturated in brightness, processing the respective gradation data on the basis of the threshold lightness to output them to the LCD panel, and outputting duty ratio data to change the duty ratio to the illumination device.

Illumination device and liquid crystal display device using the same

An illumination device is provided which can reduce a movement blur and a tailing phenomenon on a motion picture display while a drop in display brightness is suppressed, and which can suppress power consumption, can be made small and light, and can prolong the lifetime, and a liquid crystal display device using the same is provided. A light source control part of a control circuit synchronizes a latch pulse signal outputted from a gate driver control part to a gate driver, and outputs light emission control signals to respective light source power supply circuits. The respective light source power supply circuits change emission states of cold cathode fluorescent lamps to one of a first to a third emission states on the basis of the inputted light emission control signals, and illuminate an LCD panel from a rear surface of a display area. A first stage emission state is a non-lighting state, a second stage emission state is a maximum lighting state in which maximum lighting brightness is obtained, and a third emission state is an intermediate lighting state in which brightness of about one half of the second stage emission state is obtained.

The present invention relates to a light source device including discharge tubes that emit light by discharging in a thin atmosphere, a method of producing the light source device, and a display apparatus in which the light source device is employed. This light source device includes discharge tubes and a heat conductive member that is brought into contact with the neighboring area of the electrodes of the discharge tubes so as to locally cool down the neighboring area of the electrodes. In the light source device, a low heat conductivity member having lower heat conductivity than the heat conductive member is interposed between the heat conductive member and the discharge tubes. With such a structure, the luminance in the entire light source device can be increased and made uniform, and the reliability of the light source device can be increased accordingly.

Light source device, method of producing the same, and display apparatus

A lighting device includes a light source, a light conducting plate having an incident surface receiving light emitted from the light source, a back surface and a light-emitting surface, and a reflection member having a first portion facing the back surface, and a second portion located on a side opposite to a side of the light conducting plate on which the light source is located. The second portion is spaced apart from the light conducting plate so that light emitted from the light conducting plate is oriented toward an emission surface of the lighting device.

Lighting device and display device using the lighting device

A light emissive panel unit includes a light source for emitting light, a prism plate into which the light emitted by the light source means incident, a part of the light being reflectable and another part of the light passing through the prism plate, and an adjusting element for partially adjusting an amount of light emitted from a surface of the prism plate.

Light emissive panel unit

An object of the present invention is to provide a light guide device which can emit light rays of high directivity with high efficiency irrespective of incident angles, and a light source device using the light guide device which can provide light rays of high directivity with high efficiency irrespective of emitting characteristics of light source lamps, and a liquid crystal display device which is small-sized and can display at very high luminance and is free from color tone changes depending on visual angles over a wide field angle.

Light guide device, light source device, and liquid crystal display

An object of the present invention is to provide a light guide device which can emit light rays of high directivity with high efficiency irrespective of incident angles, and a light source device using the light guide device which can provide light rays of high directivity with high efficiency irrespective of emitting characteristics of light source lamps, and a liquid crystal display device which is small-sized and can display at very high luminance and is free from color tone changes depending on visual angles over a wide field angle. A substantial point light source is contained in a reflection box having an inside wall coated with a silver reflecting surface and an opening in the shape of a pinhole formed in a surface of the reflection box, and the light guide device is provided in the pinhole-shaped opening. The light guide device is a cylindrical transparent body. An incident end surface of the light guide device has a 1 mm-diameter, and an exit end surface of the light guide device has a 6.2 mm-diameter and a 100 mm-length. Source light from the substantial light source enters the incident end surface of the light guide device through the pinhole-shaped opening, repeats total reflection within the light guide device to exit at the exit end surface in light rays of high directivity of about .+-.10.degree..

A liquid crystal device including a liquid crystal layer comprising a liquid crystal of a dispersed type in which liquid crystal molecules are randomly distributed so that an incident light impinging against the liquid crystal molecules scatters to produce a white display spot. A polarizer and an analyzer are arranged on either side of the first and second transparent plates. A directional backlight is arranged on the outside of the polarizer for supplying light having a directivity in the direction perpendicular to the first and second transparent plates toward the polarizer.

Liquid crystal display device with directional backlight and image

An illuminating apparatus which comprises a plane board composed of a transparent resin having an organic fluorescent dye incorporated therein and a light-reflecting member arranged on at least a part of the back surface of the plane board, wherein a light incident from at least a part of the end face of the plane board is emitted from at least a part of the surface of the plane board.

Illuminating apparatus

An optical reader which comprises: at least one yellow LED array as a light source for lighting original material; an optical lens or fibers for guiding the light reflected from the original material; and an image sensor which changes the reflected light to signal waves. In embodiments of the reader, the light source includes both a yellow LED array and a green LED array with colored filters either provided over the LED arrays or on the optical lens or fibers.

Optical reader

A crossover construction of a thermal-head is which the thermal-head comprises: a substrate of insulating material; a plurality of heat elements disposed side by side in one row on said substrate; a plurality of lower thin film conductor patterns each of which connects to each of said heat elements and extends in direction X; an insulating layer disposed over said lower conductors; a plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, said upper and lower conductors being selectively connected together through openings of said insulating layer, wherein said insulating layer and said upper conductors comprise printed and cured paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors, and a metallic layer of low resistance is coated on each of said upper conductors.

Crossover construction of thermal-head and method of manufacturing same

Growing community of inventors

Kawasaki, Japan

Fumiaki Yamada