Hitachi, Ltd.

Hitachi Device Eng. Co., Ltd.

Hitachi Nisshin Electronics Co., Ltd.

Hitachi Electronics Devices Co., Ltd.

Shoichi Noguchi

Teruaki Odaka

Norikazu Tokunaga

Hisao Amano

Seiichi Nishiyama

Shigetake Takaku

Yoshiharu Takeda

Ikuo Yamato

Kunio Ishiyama

Toshihiro Yajima

There is provided a liquid crystal display device having a longer useful life and in which its so-called picture frame area can be narrowed. The liquid crystal display device includes a liquid crystal display panel having a display part in its central portion and a backlight disposed on a back side of the liquid crystal display panel. The backlight includes a discharge tube having electrodes at least at its opposite ends, and the electrodes are disposed at the exterior of the discharge tube. The opposite end portions of the discharge tube where the respective electrodes are disposed are positioned to be superposed on the periphery of the liquid crystal display panel and are bent with an angle with respect to the central axis of the discharge tube.

Liquid crystal display

Disclosed is a switching power source having a series connection composed of a main transformer, a current-suppressing inductance element, and a switching element and connected across a DC input power source, in which output windings are additionally wound on the main transformer and the inductance elements respectively and those output windings are connected in series to each other so as to form an auxiliary power source for a control circuit for driving/controlling the ON-OFF of the switching element, and a starting circuit is provided to supply power from the DC input power source to the control circuit only during the starting time of the switching power source.

Supply having a load invariant auxiliary power supply supplied from a

A switching power supply, in which a series circuit consisting of a primary winding of a transformer and a controllable switch is connected with a DC power source and a secondary winding of the transformer is connected with a first voltage source outputting the voltage developed across the secondary winding during the on-period of the controllable switch and a second voltage source storing the exciting energy of the transformer during the off-period of the controllable switch by using the exciting inductance of the transformer as a current source, a series circuit consisting of the first and the second voltage sources being connected with a load. Owing to this construction, even if voltage-current characteristic of a load having constant voltage characteristic, such as a magnetron, vary due to variations in the temperature, etc., the output voltage is automatically compensated and a stable electric power can be supplied to the load.

Switching power supply

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Chiba, Japan

Shoichi Noguchi