Oki Electric Industry Co., Ltd.

Oki Data Corporation

Kazuo Tokura

Yukio Nakamura

Mitsuhiko Ogihara

Masumi Taninaka

Takatoku Shimizu

Hiroshi Furuya

Mio Chiba

Ichimatsu Abiko

Katsuzo Kaminishi

Takashi Ishizaki

Shigemitsu Horikawa

Takeyuki Yanagibashi

Tokio Sato

Kengo Ohtaka

Mituhiko Ogihara

Yasuo Iguti

A display device includes a transparent substrate, and a plurality of single-crystal thin-film semiconductor light-emitting elements disposed on one side of the transparent substrate. Each of the single-crystal thin-film semiconductor light-emitting elements is composed of single-crystal thin-film semiconductor layers separated from a base substrate, and includes a light-emitting layer and two non-light-emitting layers disposed on both sides of the light-emitting layer.

Display device capable of emitting light from opposite sides

A light-emitting-diode array is formed on a substrate having an upper layer of a semiconducting material and a lower layer of an insulating or semi-insulating material. The upper layer is divided into blocks by isolation channels that cut completely through the upper layer. The light-emitting diodes, which are formed by selective diffusion of an impurity into the upper layer, are arranged in a single row, with at least two light-emitting diodes in each block of the upper layer. Each block has a block electrode that drives the light-emitting diodes in the block. The row of light-emitting diodes is paralleled by a number of shared lines which cross the isolation channels. Each shared line is coupled to a plurality of light-emitting diodes in different blocks.

Low-cost, high-density light-emitting-diode array and fabrication method thereof

To achieve a reduction in the size of the print head and a reduction in the cost, LED array chips,achieved by matrix-connecting M&times;N LED elements,with M pad electrodes to be scanned,and N pad electrodes to be driven,and LED array drive ICs,are mounted at a mounting substrate,The pad electrodes to be driven,are connected with drive pad electrodes,and the pad electrodes to be scanned,are connected with scan pad electrodes,through wires,and,respectively. The pad electrodes to be driven,and the pad electrodes to be scanned,are provided in a single row along one side or edge of the lengthwise side of the chip. The LED array drive ICs,are provided with a scan control unit that sequentially validates the M pad electrodes to be scanned,one at a time based upon a scan signal and a data control unit that supplies drive currents to the N pad electrodes to be driven,in conformance to individual sets of data to cause N LED elements,connected with a valid pad electrode to be scanned,to emit light, each time the valid pad electrode to be scanned,is switched.

Light emitting element array chip, light emitting element array drive IC and print head

High-density light-emitting-diode array utilizing a plurality of

According to a first aspect of the invention, a light-emitting and light-sensing diode has a doped region with a depth not exceeding 2 .mu.m, for adequate sensitivity, and an impurity concentration of at least 5.times.10.sup.20 atoms/cm.sup.-3, for adequate emission. According to a second aspect of the invention, a light-emitting and light-sensing diode has a doped region with a deep part and a shallow part, and the area of the shallow part is increased to enhance the sensitivity of the diode. This may be done by providing the doped region with a meandering edge, or with one or more interior islands, or by forming the deep and shallow parts separately.

Light-emitting and light-sensing diode array device, and light-emitting

An array of light-emitting elements is switched on and off to produce a graded-intensity image on a photosensitive medium. Each light-emitting element is controlled by M-bit data representing the intensity of one image pixel, where M is a fixed integer greater than one. M strobe signals are generated for non-overlapping time intervals of different lengths, to strobe the M data bits for each light-emitting element. When strobed, each data bit switches its corresponding light-emitting element on or off. Image intensity depends on the total amount of time for which each light-emitting element is switched on.

Method and apparatus for controlling array of light-emitting elements

An array of LEDs is controlled by a control circuit so as to emit light in a write mode and sense light in a read mode. In the read mode, each LED is alternately charged for a first interval, then allowed to discharge by flow of photocurrent for a second interval. At the end of the second interval, just before charging of the LED begins again, the anode voltage of the LED is read by coupling the anode of the LED to an output terminal for a third interval. The third interval of each LED may coincide with the first interval of the preceding LED in tile array, so that each LED is read while the preceding LED is being charged.

Control circuit for array of light-emitting diodes

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Tokyo, Japan

Kazuo Tokura