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Hot cathode discharge lamp, lamp unit and display

A hot cathode and discharge lamp technology, applied in the field of lamp units and display devices, can solve the problems of short lamp life and achieve long lamp life and good lamp output

Inactive Publication Date: 2008-09-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the lamp life of the hot cathode type discharge lamp is short, there is a problem in using a light source as a backlight unit from the standpoint of life.

Method used

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  • Hot cathode discharge lamp, lamp unit and display
  • Hot cathode discharge lamp, lamp unit and display
  • Hot cathode discharge lamp, lamp unit and display

Examples

Experimental program
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Effect test

Embodiment approach 1

[0042] Structure of a hot cathode discharge lamp

[0043] Next, the hot cathode discharge lamp according to Embodiment 1 of the present invention will be described. Fig. 3 is a sectional view showing the structure of a hot cathode discharge lamp (hereinafter, sometimes simply referred to as "lamp") 20 of this embodiment, Fig. 3(a) is a plan sectional view, and Fig. A cross-sectional view of a cut section.

[0044] The lamp 20 has a straight tube-shaped glass bulb 22 , and a pair of electrodes 30 a and 30 b arranged at both ends of the glass bulb 22 .

[0045]The glass bulb 22 is made of barium strontium silicate glass (soft glass with a softening point of 675° C.). As shown in FIG. 2 , the cross section of the glass bulb 22 perpendicular to the tube axis is an ellipse with a long inner diameter L1 and a short inner diameter L2. Thus, the glass bulb 22 is formed into an elliptical shape, so the lamps 20 are arranged so that the short inner diameter of the glass bulb 22 is ar...

Embodiment approach 2

[0073] Next, a hot cathode discharge lamp according to Embodiment 2 of the present invention will be described. Embodiment 2 differs from Embodiment 1 in the composition of the rare gas for buffering, but is the same in other respects, so descriptions of parts other than the composition of the rare gas for buffering are omitted.

[0074] The inventors of the present invention have repeatedly conducted intensive studies in order to achieve a long life using a hot-cathode discharge lamp used as a light source of a backlight unit. The present inventors noticed that krypton was mixed in addition to argon as a buffer rare gas for dilution, and that the life of the lamp became longer as the partial pressure ratio of krypton increased. In addition, the life of the lamp becomes longer when the partial pressure ratio of krypton is increased because argon is generally used mainly. However, increasing the partial pressure ratio of krypton, which has a larger atomic weight than argon, mak...

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Abstract

Disclosed is a hot cathode discharge lamp (20) comprising a glass bulb (22) whose cross section perpendicular to the tube axis has a flattened shape, and electrode coils (31a, 31b) arranged within the glass bulb (22) so that the axes thereof are aligned along the major diameter of the flattened shape. The length L of the electrode coils (31a, 31b) in the axis direction satisfies the following relation: L2 < L < L1, with L1 being the major inner diameter of the flattened shape of the glass bulb (22)and L2 being the minor inner diameter thereof. Also disclosed is a backlight unit (5) comprising the hot cathode discharge lamp (20) as a light source.

Description

technical field [0001] The present invention relates to a hot cathode discharge lamp, a lamp unit and a display device having the discharge lamp as a light source. Background technique [0002] Currently, a cold cathode type discharge lamp is mainly used as a light source for a backlight unit of a liquid crystal display. Since the cold-cathode discharge lamp is suitable for reducing the diameter, it is suitable as a light source for a backlight unit that requires thinning. [0003] However, along with the increase in size of liquid crystal displays, there is a demand for higher efficiency of lamps used as light sources of backlight units of liquid crystal displays. Currently, cold-cathode discharge lamps are mainly used as light sources for backlight units, but hot-cathode discharge lamps that are more efficient than these lamps have begun to attract attention as new light sources for backlight units. [0004] In addition, Patent Document 1 discloses a hot-cathode discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/067F21S2/00H01J61/16H01J61/30F21Y103/00
CPCH01J61/0672H01J61/16H01J61/20H01J61/28H01J61/305H01J61/33H01J61/72H01J61/067H01J61/30
Inventor 饭田史朗
Owner PANASONIC CORP
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