Sharp Kabushiki Kaisha Corporation

Yasuhiro Wada

Takahiro Funakoshi

Masahiko Kimoto

Hitoshi Azuma

Terukazu Ohtsuki

Hiroshi Minematsu

Nobuyuki Tominaga

Masumi Nakamichi

Yoichi Tsuda

Takehiro Yamamoto

A plane-shaped lighting device has a light-directing plate and a light source that is placed in contact with or in the proximity of the light-incident surface of the light-directing plate, and the light source is constituted of a plurality of LED lamps each of which has an LED chip for emitting light and a semispherical lens for directing the light from the LED chip into the light-directing plate. Here, the distance from the LED chip to the top of the semispherical lens is set to be 1.8 times as long as the radius of curvature of the semispherical lens. This arrangement allows the light emitted from the LED chip to be efficiently incident on the light-incident surface of the light-directing plate, thereby improving the light-incidence efficiency to the light-directing plate. Further, the application of this plane-shaped lighting device to display devices makes it possible to improve the efficiency of light utilization, and consequently to provide thinner display devices with high visibility.

Plane-shaped lighting device and a display using such a device

A DBS tuner for satellite broadcasting receivers, includes an attenuating filter (trap circuitry) composed of a microstrip line having an open-ended load terminal which projects from the RF signal line or the power supply line.

DBS tuner for satellite broadcasting receivers

There is provided an inexpensive light emitting display device which has a simple wiring structure and produces a bright screen display. A photo-transistor is connected in series with a light emitting diode. The photo-transistor is arranged so that light emitted from the light emitting diode enters into the photo-transistor. There is provided an optical guide for guiding a data signal light to the photo-transistor and an optical guide for guiding a scanning signal light to the phototransistor. Further, an optical control section has a laser diode array, a lens array, and a deflection mirror. The above-mentioned arrangement obviates the need of an electric wiring for a data signal and a scanning signal, and is able to turn on the photo-transistor with the emission light from the light emitting diode and makes the photo-transistor self-hold its conductive state.

Light emitting display device having light receiving element for

Growing community of inventors

Takatsuki, Japan

Yasuhiro Wada