Hitachi, Ltd.

Hitachi Electronic Devices Co., Ltd.

Hitachi Electronic Devices, Ltd.

Other

Hitachi Displays, Ltd.

Hitachi Display Devices, Ltd.

Hitachi Electronics Devices Co., Ltd.

Yoshiharu Takeda

Seiichi Nishiyama

Shigetake Takaku

Shigeo Mikoshiba

Koji Hashimoto

Tomokazu Shiga

Toshihiro Yajima

Yusuke Baba

Shoichi Noguchi

Reiji Torai

Masayoshi Misono

A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.

Liquid crystal display device having an improved backlight

The invention relates to a fluorescent lamp with an external electrode used as a backlight of a liquid crystal display device or others. To reduce invalid parts of the backlight, the length in an axial direction of an external electrode of the fluorescent lamp is required to be reduced. Therefore, a concave portion is provided to the end of the fluorescent lamp with an external electrode, and by forming the external electrode in the concave portion, the total area of the external electrodes is secured. Even if the length in the axial direction of the external electrode is short, discharge is stabilized. Graphite is used for the external electrode; however, graphite in which a water glass component is increased to enhance its mechanical strength is used.

Fluorescent lamp with external electrode, backlight, and display device

A liquid crystal display includes a liquid crystal display panel for modulating light to form an image, and a back light unit having a plurality of lamp tubes with outside electrodes and without inside electrodes. Each of the plurality of lamp tubes has a first outside electrode disposed at one end portion and a second outside electrode disposed at another end portion. The first outside electrode which is disposed at one of the plurality of lamp tubes is electrically connected with the first outside electrode disposed at an adjacent another of the plurality of lamp tubes by a conductive member, and the second outside electrode which is disposed at the one of said plurality of lamp tubes is electrically connected with the second outside electrode disposed at the adjacent another of the plurality of lamp tubes by a conductive member.

Liquid crystal display

A liquid crystal display device includes a liquid crystal display panel and a backlight disposed behind the liquid crystal display panel. The backlight includes: a light source including a discharge tube having no electrodes therein, and first and second electrodes disposed outside the discharge tube; and a power source which supplies first and second high-frequency voltages to the first and second electrodes, respectively. The first and second electrodes are disposed at two ends of the discharge tube in a direction of a longitudinal axis thereof, respectively. A length of a first wiring for coupling the power source to the first electrode is approximately equal to a length of a second wiring for coupling the power source to the second electrode.

A liquid crystal display includes a liquid crystal display panel which has first and second drain lines groups, a control circuit board which has a control unit, a first and second drain drivers groups connected to the corresponding first and second drain lines groups, a back light unit, a metal frame, and a shield member which shields against EMI. Both of the first and second drain drivers groups are arranged at a same peripheral side of the liquid crystal display panel. The control unit supplies first and second signals to the drain drivers groups via flexible printed circuits which are connected to the control circuit board. The control circuit board is sandwiched between the metal frame and the shield member, and the metal frame is arranged between the control circuit board and the liquid crystal display panel.

A liquid crystal display having a liquid crystal display panel for modulating light to form an image and a back light unit having a plurality of lamp tubes without inside electrodes and which are discharged by outside electrodes disposed along an outer surface of the at least one lamp tube, the back light unit being disposed behind the liquid crystal display panel. One outside electrode disposed at the at least one of the plurality of lamp tubes is electrically connected with another outside electrode disposed at an another adjacent lamp tube.

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.

A liquid crystal display is formed by a liquid crystal display panel for modulating light to form an image, and a back light unit including a lamp tube which is discharged by an electrode and is disposed behind said liquid crystal display panel, wherein said electrode is formed outside of said lamp tube. In this way, the liquid crystal display unit has a life span which can be increased without the need to replace the lamp tube or the back light unit.

Growing community of inventors

Mobara, Japan

Yoshiharu Takeda