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Backlight device

A technology of back lighting and light guide plate, applied in lighting devices, lighting and heating equipment, light guides of lighting systems, etc., can solve problems such as complex structures

Inactive Publication Date: 2008-05-07
HARISON TOSHIBA LIGHTING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to install an illumination curtain for making the luminous brightness in the luminous area uniform, and there is a problem that the structure is complicated.

Method used

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Experimental program
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Embodiment Construction

[0032] Embodiments of the present invention will be described in detail with reference to the drawings.

[0033] In the fluorescent lamp 1 shown in FIG. 1( a ), a phosphor coating is applied to the inner wall surface of a glass tube 2 , and a rare gas and mercury are sealed inside. Inside both ends of the glass tube 2 there are electrodes 3a, 3b consisting of a pair of cold cathodes. The electrodes 3a, 3b are plate-shaped electrodes made of nickel, and are connected to lead wires 4a, 4b, respectively. Conductive wires 4a, 4b are enclosed at both ends of the glass tube 2, the electrodes 3a, 3b are fixed, and electric power supplied from the outside is supplied to the respective electrodes 3a, 3b.

[0034] The shape of the cross-section of the discharge space of the glass tube 2 perpendicular to the tube axis is defined by, for example, the major diameter 21 and the minor diameter 2s, which are internal dimensions of the glass tube. For example, the long diameter is in the ran...

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PUM

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Abstract

A backlight device (10) using a long flat fluorescent lamp (11) having a flat cross-sectional shape with the major axis and minor axis. Light entry surfaces (12a) of light guide plates (12) are formed within the light emission area of the light guide plates. Each light entry surface and each major axis light emission surface are located so as to face each other. The backlight device is less in thickness than a direct type and less in width than an edge light type, so that the device can be thinned and downsized, and also a frame of the device can be reduced in width.

Description

technical field [0001] The present invention relates to a backlight device for a liquid crystal display device. Background technique [0002] In recent years, liquid crystal display devices have been continuously increased in size. Most of the backlight devices used in such large liquid crystal display devices are of the so-called bottom emission type. In this bottom-firing type backlight device, a plurality of fluorescent lamps are arranged on the bottom surface of a casing, and a light guide plate is arranged above the top so that light from the fluorescent lamps enters. In this bottom-illuminated backlight device, in order to uniformize the luminance of the light-emitting surface of the backlight, it is necessary to provide a predetermined distance between the fluorescent lamp and the light guide plate. Therefore, the thickness of the backlight device increases, and the number of lamps used in the backlight device for a large liquid crystal display device increases, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00G02F1/13357F21Y103/00G02F1/1335
Inventor 渡边康弘池田达也
Owner HARISON TOSHIBA LIGHTING CORP