Hitachi, Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi Displays, Ltd.

Japan Display Inc.

Hitachi Microcomputer Engineering, Ltd.

Hitachi Video Engineering, Incorporated

Hitachi Engineering Ltd

Kiyoshige Kinugawa

Hajime Akimoto

Shigeyuki Nishitani

Hiroyuki Mano

Takeo Shiba

Yoshirou Mikami

Shigeru Matsuyama

Toshio Futami

Kiyokazu Nishioka

Satoru Tsunekawa

Tadashi Ishibashi

Kazuhiko Yanagawa

Sukekazu Aratani

Keiichiro Ashizawa

Masuyuki Ohta

Kazuhiro Ogawa

Nobutake Konishi

Masahiro Yanai

Satoru Ogihara

Yasuyuki Mishima

Tatsuhiro Inuzuka

Hiroaki Asuma

Masahito Oh-e

Satoshi Konuma

Toshiyuki Sakuma

Naofumi Aoyama

Kazuhiro Fujisawa

Shyusuke Endo

Yoshiharu Nagae

Nobuaki Hayashi

Yasuhiko Kando

Hironari Tanaka

Toshihiko Yabuuchi

Shizuo Ishitani

Yosio Hanada

Shinji Tanaka

Masato Ito

Shoichi Uchino

Masaaki Kitajima

Susumu Sasaki

Hideaki Kawakami

Yuji Mori

Makoto Okai

Tomio Yaguchi

Akira Ishii

Toshimitsu Matsudo

Tsuguji Tachiuchi

Minoru Hoshino

Tetsuya Yamazaki

Ken Sasaki

Masaharu Koyama

Yoshimichi Shibuya

Kazuhisa Toriyama

Takahiko Muneyoshi

Akiko Iwata

Masatoshi Ito

Masahiro Takasaka

Kazuhiko Kai

Hiroshi Sakurada

Jun-ichi Hirakata

Yukihiro Sato

Ren Ito

Yoshihiro Nozaki

Yoshio Hanada

Katuyuki Hunahata

Keiichi Aoki

Yoshihiro Mikami

The invention provides an image display device that has an especially satisfactory display quality for animated images, and sufficiently suppresses the irregularities of display quality among pixels. The image display device includes a light emitting drive means that drives a light emitting means, based on an analog display signal inputted to the pixels, and a light emitting control switch for controlling a light-on or light-off of the light emitting means on one end of the light emitting drive means in each pixel.

Image display device

In an image display apparatus using an FED or an organic EL element, image display that is high in illumination uniformity and high in image quality can be performed. A display element with a matrix structure which conducts linear sequential driving which determines the luminance by a current is used, a threshold voltage of a cathode line immediately before one select period has been terminated where a control electrode line is sequentially driven is measured by a threshold voltage measuring section, the measured threshold voltage is recorded for each of the pixels, and a driving signal at the time of selecting the pixel is corrected by using the value of the recorded threshold voltage, to thereby control electric charge that is emitted from a cathode.

Flat panel display apparatus

The recent invention provide an organic electroluminescence display device with color purity adjustment, particularly white purity increased, without increasing formation processes. For each of unit pixels formed on an insulating film INS formed on a principal surface of a glass substrate, a bank BNK is provided on a bottom electrode BEL being a pixel electrode. The bank BNK has the shape of a bank that surrounds a pixel concerned, for each of pixels, and an organic electroluminescence light emitting layer is charged within a region surrounded by the banks BNKs. Between the banks BNKs, a green light emitting layer (G light emitting layer), a blue light emitting layer (B light emitting layer), and a red light emitting layer (R light emitting layer) are provided. At the same time as the formation of these color light emitting layers, light emitting layers of three colors, the green light emitting layer (G light emitting layer), the blue light emitting layer (B light emitting layer), and the red light emitting layer (R light emitting layer) are stacked on a region of a white pixel to form a white light emitting layer (G+B+R). An upper electrode UEL is formed over the green light emitting layer (G light emitting layer), the blue light emitting layer (B light emitting layer), the red light emitting layer (R light emitting layer), and the white light emitting layer (G+B+R light emitting layer).

Organic electroluminescence display device having red, green, blue and white pixels

An image display device which has a stable luminous brightness among pixels. An on/off control switchfor stopping the driving operation of a light emitting elementis provided in a pixel. A change in the luminous brightness caused by a variation in the characteristic of the light emitting elementis suppressed by feeding a result measured by a current measuring circuit provided in one end of a power lineback to a drive signal for the light emitting element

The present invention provides an image display capable of performing high-precision multi-gradation display while avoiding problems of a subtle noise and increase in a drive frequency. Display signal data of one frame is constructed by a plurality of sub frames of, for example, four sub frames 1/4 to 4/4. The 1/4 frame is set as an address period of an analog signal, the 2/4 frame is set as an analog gradation display period, the 3/4 frame is set as an address period of a digital signal, and the 4/4 frame is set as a digital gradation light emission period. The image display is constructed in such a manner that, in the analog gradation display period, an OLED device in a pixel emits light of time according to an analog signal voltage stored in a storage capacitor in the pixel by an analog drive signal circuit and, in the digital gradation display period, a binary light emitting operation of light emission and non light emission is performed according to a digital signal voltage stored in the storage capacitor by a digital signal driving circuit.

Image display

A multi-tone display matrix display device including a matrix display panel having a matrix having plural X and Y direction signal lines lying at right angles to each other, intersecting points on the matrix being pixels of an image, an X direction driving section for sequentially scanning X direction signal lines to provide image signals, a Y direction driving section for driving the Y direction signal lines in synchronism with the scanning of the X direction signal lines to sequentially provide select signals to the Y direction signal lines, an A-D converter section for converting an analog signal into a digital signal, a voltage generating section for generating signals at plural voltage levels, and a selector section for selecting an output signal from the voltage generating section based on the output from A-D converter section and providing to output to the X direction driving section as an image signal.

Multi-tone display device

This specification discloses a novel multi-tone display matrix display device. The matrix display device according to an embodiment of the present invention comprises a matrix display panel having a matrix composed of plural X direction signal lines and plural Y direction signal lines lying at right angles thereto, intersecting points on the matrix being pixels of an image to be displayed, an X direction driving section for sequentially scanning the X direction signal lines to provide image signals, a Y direction driving section for driving the Y direction signal lines in synchronism with the scanning of the X direction signal lines to sequentially provide select signals to the Y direction signal lines, an A-D converter section for receiving an analog signal and converting it into a digital signal, a voltage generating section for generating signals at plural voltage levels, and a selector section for selecting an output signal from the voltage generating section in accordance with the output from A-D converter section and providing it to the X direction driving section as an image signal.

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Mutsuzawa, Japan

Kiyoshige Kinugawa