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Fluorescent lamp and backlight unit

A technology of fluorescent lamps and phosphors, applied in the directions of fluorescent lamps, light sources, discharge lamps, etc., can solve the problems of low initial brightness, selection, and difficulty in light, etc.

Inactive Publication Date: 2008-11-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In addition, in the lamp as in background art (2), considering that the metal oxide body 510 has a cluster shape, the light converted by the phosphor layer is blocked by the cluster-shaped metal oxide body 510, thereby making it difficult for light to pass from the glass bulb 530 elected
Therefore, although conventional lamps suppress mercury consumption, their initial brightness is low

Method used

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  • Fluorescent lamp and backlight unit
  • Fluorescent lamp and backlight unit
  • Fluorescent lamp and backlight unit

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Embodiment approach 1

[0083] 1.1 Structure of CCFL

[0084] The structure of the cold cathode fluorescent lamp 20 of the present embodiment will be described below with reference to the drawings. figure 1 is a partial sectional view showing a schematic structure of the cold cathode fluorescent lamp 20 and a partial enlarged view of a phosphor layer.

[0085] The cold cathode fluorescent lamp 20 has a glass bulb 30 that is a straight tube with a generally circular cross-section. The glass bulb 30 consists of borosilicate glass, for example. Note that the glass bulb 30 has a length of 720 mm, an outer diameter of 4.0 mm, and an inner diameter of 3.0 mm.

[0086] Note that the glass bulb 30 is not limited to borosilicate glass. Lead glass, lead-free glass, soda glass, etc. can be used. In this case, the dark-start characteristic of the lamp can be improved. Specifically, glasses such as those mentioned above contain large amounts of alkali metal oxides such as sodium oxide (Na 2 O), in the exemp...

Embodiment approach 2

[0190] Embodiment 2 is described below.

[0191] 2.1 Overview of fluorescent lamp structure and manufacturing method

[0192] In the exemplary fluorescent lamp of the present invention, the rod-shaped body has an inner-phosphor particle length longer than its width in the diameter direction, and has a thickness of 1.5 μm or less. Additionally, a pair of adjacent phosphor particles may be spanned by multiple rods. Here, the "thickness" of the rod-shaped body can be seen when observed using a high-resolution scanning electron microscope (HRSEM), and refers to the thickness at 1 / 2 of the longitudinal length of the rod-shaped body (length in the direction of the inner-phosphor particle).

[0193] It is preferable that the metal oxide is at least one selected from specifically Y, La, Hf, Mg, Si, Al, P, B, V and Zr. Especially preferred metal is Y. If the metal oxide contains yttrium oxide such as Y 2 o 3 , can further reduce the consumption of mercury.

[0194] In an exemplar...

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Abstract

A fluorescent lamp (20) includes a glass bulb (30) that has mercury enclosed therein, and a phosphor layer (32) formed on an inner side of the glass bulb (30). The phosphor layer (32) includes three types of phosphor particles, which are red phosphor particles (32R), green phosphor particles (32G) and blue phosphor particles (32B) that are excited by ultraviolet radiation to emit red light, green light and blue light respectively. The blue phosphor particles (32B) and green phosphor particles (32G) have a property of absorbing ultraviolet radiation with a wavelength of 313 nm.

Description

technical field [0001] The present invention relates to fluorescent lamps and backlight units, and more particularly to techniques for preventing ultraviolet radiation from leaking out of fluorescent lamps. Background technique [0002] (1) The backlight unit is mounted on the back surface of the liquid crystal panel and used as a light source of the liquid crystal display device. Backlight units can generally be classified into edge-light units and direct-type units. [0003] The direct type backlight unit includes a case opened on the liquid crystal panel side for taking out light and a large number of cold cathode fluorescent lamps disposed in the case. The opening is covered by a plastic diffuser plate, diffuser sheet, lens sheet, etc. [0004] Due to the ability to use small-diameter glass bulbs, cold cathode fluorescent lamps are often used in backlight units requiring thinness and brightness. In addition, mercury is enclosed in glass bulbs as a luminescent material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/42H01J9/20H01J61/44F21Y103/37
CPCH01J61/44C09K11/7734C09K11/7739C09K11/7774C09K11/7776C09K11/7777C09K11/7787C09K11/7794H01J9/223H01J61/09H01J61/302C09K11/77346C09K11/77746
Inventor 松尾和寻川崎充晴荒田拓之土生田祐子桥本望板垣克己和田英树
Owner PANASONIC CORP
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