Kabushiki Kaisha Toshiba

Toyoda Gosei Co., Ltd.

Nozomu Takahashi

Mitsuhiro Kobayashi

Koichi Nitta

Hiroaki Oshio

Kenji Shimomura

Tomokazu Kitajima

Yoshiaki Sugizaki

Akihiro Kojima

Yosuke Akimoto

Toshiya Uemura

Hideo Tamura

Kazuhito Higuchi

Susumu Obata

Yuji Takahashi

Koichi Ota

Hidefumi Yasuda

Asako Ikeda

Yuichiro Niikura

According to one embodiment, a light emitting device includes a semiconductor layer, a p-side electrode, an n-side electrode, a first insulating layer, a p-side interconnect layer, an n-side interconnect layer and a second insulating layer. The semiconductor layer includes a first surface, a second surface opposite to the first surface, and a light emitting layer. The p-side electrode is provided on the second surface in a region including the light emitting layer. The n-side electrode is provided on the second surface in a region not including the light emitting layer. The p-side interconnect layer includes a p-side external terminal exposed from the second insulating layer at a third surface having a plane orientation different from a plane orientation of the first surface and a plane orientation of the second surface. The n-side interconnect layer includes an n-side external terminal exposed from the second insulating layer at the third surface.

Light emitting device, light emitting module, and method for manufacturing light emitting device

Light-emitting diode

A light emitting device, free from change of color even when the wavelength of a light emitting element shifts, includes a light emitting element () for emitting primary light having an intensity peak at a wavelength shorter than 400 nm; a silicone resin () provided to embed the light emitting element; and a fluorescent element () contained in the silicone resin to absorb the primary light and release visible light.

Light emitting device

A gradation controlled LED display device has an LED array having a matrix of LED chips. The lighting time of each of the LED chips is controlled to display one of gradation levels. The display device has a gradation control circuit, linearity adjusting circuits, and a base-resistance selector that are connected to data lines, which are connected to the LED chips. The gradation control circuit controls the lighting time of each LED chip according to 8-bit display data, to display one of 255 gradation levels. The linearity adjusting circuit determines whether or not five upper bits of given 8-bit display data are all 'zero' and provides a resultant signal. If the resultant signal indicates that the five upper bits are all 'zero', the base-resistance selector selects a large base resistance value, and if any one of the five upper bits is '1', a small base resistance value. In this way, a base resistance value applied to the base of a pnp transistor of a data driver for driving one data line is selected between the large and small values, to sharply turn on and off the pnp transistor at low gradation levels. This arrangement clearly distinguishes the lighting times of low gradation levels from one another and improves the contrast of low gradation levels.

Gradation controlled LED display device and method for controlling the

A dot-matrix LED display device has an LED array with a dot matrix of LEDs, a matrix driver unit for driving the LEDs, and a control unit for controlling the matrix driver unit. The display device has a data storage unit for storing brightness-corrected data prepared according to the characteristic brightness of each of the LEDs, selects the brightness-corrected data stored in the data storage unit according to externally provided display data, and drives the LEDs according to the selected brightness-corrected data. This arrangement minimizes brightness difference among the LEDs due to fluctuations in the characteristics of the LEDs.

Dot-matrix LED display device having brightness correction circuit and

An LED display device and a method for controlling the same have been proposed which comprises at least an LED matrix circuit in which LEDs are arranged in a matrix fashion, an analogue switch for respectively selecting analogue display data for respective rows in said LED matrix circuit, a sample hold circuit for sample-holding the display data selected by the analogue switch, a driver for driving and controlling the LEDs in corresponding rows of the LED matrix circuit based on the display data being sample-held, and a counter and a decoder for generating a switching signal of the analogue switch. According to this configuration, a gradation display of the LEDs is executed by virtue of the display data as analogue signals.

Led display device and method for controlling the same

An optical semiconductor device having a substrate; a plurality of light-emitting diodes disposed in a specific arrangement on the substrate; a peripheral member for housing the substrate and the light-emitting diodes; a first resin layer formed on an area of said substrate within the peripheral member and not occupied by said light-emitting diodes, for securing the light-emitting diodes between the substrate and the peripheral member; and a second resin layer formed on the first resin layer, wherein: minute irregularities are formed on the second resin layer so that external light directed onto the exposed surface of the second resin layer is diffusedly reflected.

High contrast LED matrix

The semiconductor of the present invention includes the first lead electrode having a tip portion on which a plurality of semiconductor elements are arranged, a plurality of the second lead electrodes each having a tip portion located close to the tip portion of the first lead electrode, bonding wires for electrically connecting the semiconductor elements and the tip portions of the second lead electrodes with each other, and a mold resin for covering at least the tip ends of the first and second lead electrodes. Further, the invention is characterized in that the second lead electrodes are not arranged in a straight line in the plane common to the end surfaces thereof, and that the second lead electrodes are arranged in a straight line in a plane which is parallel to any of the end surfaces thereof.

LED lamp having particular lead arrangement

Growing community of inventors

Ayase, Japan

Nozomu Takahashi