Sharp Kabushiki Kaisha Corporation

Mitsuyoshi Seo

Yuji Yamamoto

Hisao Okada

Hiroshi Itoh

Kuniaki Tanaka

Kenichi Iwauchi

Atsushi Yamanaka

Akemi Oohara

Sakae Saitoh

Akinobu Takeda

A transformerand a photocouplerare provided to ensure insulation between a primary side circuit sectionconnected to an alternating current power supply, and a secondary side circuit sectionfor applying a voltage to a lamp. A detection circuit sectionE, provided in the secondary side circuit section, detects an output voltage and an output current of the lampto detect a deviation from a predetermined power. A signal corresponding to the deviation, which has been detected by the detection circuit sectionE, is transmitted to the primary side circuit sectionvia the photocouplerprovided between the primary side circuit sectionand the secondary side circuit section. A switching control section, provided in the primary side circuit section, carries out switching control for constant power lighting based on the signal transmitted from the photocoupler

Discharge lamp lighting device for lighting discharge lamps

A light emitting device provided with a plurality of types of light sources having different light emitting colors and with a light emission control means for allowing light to emit, during a specified period of monitoring a light emitting intensity, from at least one light source out of the plurality of types of light sources at a light emitting intensity different from that available outside the specified period. Accordingly, when a plurality of types of light sources are used, the light emitting intensities of a plurality of types of light sources can be monitored with light sensors of types fewer than the types of light sources to control while points and a brightness characteristics.

Light emitting device and display apparatus and read apparatus using the light emitting device

A driving circuit of the invention is used for driving a display apparatus which includes pixels and data lines for applying voltages to the pixels and which displays an image with multiple gray scales in accordance with video data consisting of a plurality of bits. The driving circuit includes: an oscillating signal specifying section for specifying one of a plurality of oscillating signals having respective mean values which are different from each other in accordance with video data consisting of bits selected from the plurality of bits, and for outputting the specified oscillating signal T and an oscillating signal T-bar which is obtained by inverting the specified oscillating signal T; a gray-scale voltage specifying section for producing gray-scale voltage specifying signals which specify a first gray-scale voltage and a second gray-scale voltage among a plurality of gray-scale voltages supplied from a gray-scale voltage supply section, in accordance with video data consisting of bits other than the selected bits of the plurality of bits; and an output section for outputting the first gray-scale voltage and the second gray-scale voltage specified by the gray-scale voltage specifying signals to the data lines, in accordance with the oscillating signal T and the oscillating signal T-bar.

Driving circuit for display apparatus

Growing community of inventors

Funabashi, Japan

Mitsuyoshi Seo