Fluorescent lamp, method of manufacturing the same, and backlight unit having the same

a fluorescent lamp and backlight technology, applied in the field of lamps, can solve the problems of difficult enhancement of brightness and efficiency of eefl, complex and expensive manufacturing, and inability to extend the region where electric charges are generated, and achieve the effect of high brightness and efficiency and easy manufacturing

Inactive Publication Date: 2011-09-20
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]An advantage of the present invention is to provide a fluorescent lamp with high brightness and efficiency, a method of manufacturing the same, and a backlight unit having the same.
[0024]Another advantage of the present invention is to provide a fluorescent lamp that is easy to manufacture, a method of manufacture the same, and a backlight unit having the same.
[0025]Additional advantages and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
[0026]To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a fluorescent lamp including: an emissive glass tube coated with a phosphor; first and second non-emissive glass tubes joined to the emissive glass tube; and first and second electrodes formed on outer surfaces of the first and second non-emissive glass tubes.
[0027]In another aspect of the present invention, there is provided a method of manufacturing a fluorescent lamp, the method including: forming an emissive glass tube having a first thickness, a first diameter, and both opened ends; forming first and second non-emissive glass tubes each having a second thickness, a second diameter larger than the first diameter, and one opened end; joining the emissive glass tube to the first and second non-emissive glass tubes; and forming first and second electrodes on outer surfaces of the first and second non-emissive glass tubes.
[0028]In a further another aspect of the present invention, there is provided a backlight unit including: a fluorescent lamp disposed at a side surface thereof, the fluorescent lamp including an emissive glass tube and first and second non-emissive glass tubes joined to the emissive glass tube; a light guide plate disposed on the same plane as the fluorescent lamp to guide light from the fluorescent lamp in a forward direction; and a reflection plate below the light guide plate to reflect the light in the forward direction.

Problems solved by technology

The CCFL can emit high-brightness light, but it is complex and expensive to manufacture.
Therefore, the region where the electric charges are generated cannot be extended.
Accordingly, it is difficult enhance the brightness and efficiency of the EEFL.
However, it is difficult, complex and time-consuming to form the end portion of the glass tube in a balloon shape.
Also, it is difficult to form the balloon-shaped end portions of the glass tubes uniformly for every EEFLs.

Method used

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Effect test

first embodiment

[0040]FIG. 2 is a sectional view of an EEFL 10 according to the present invention.

[0041]Referring to FIG. 2, the EEFL 10 includes an emissive glass tube 11 whose inner surface is coated with a phosphor 12, first and second non-emissive glass tubes 13 and 15 joined to both ends of the emissive glass tube 11, and first and second electrodes 14 and 16 formed on outer surfaces of the first and second non-emissive glass tubes 13 and 15. The thickness of the non-emissive glass tube is identical to that of the emissive glass tube, but the diameter of the non-emissive glass tube is different from that of the emissive glass tube. The inner space formed by the emissive tube and the non-emissive tubes is filled with gas.

[0042]The emissive glass tube 11 may be formed of the same transparent material as the first and second non-emissive glass tubes 13 and 15.

[0043]Light generated at the inner space is emitted through the emissive glass tube 1 to an outside. However, the generated light cannot be...

second embodiment

[0051]FIG. 3 is a sectional view of an EEFL 20 according to the present invention.

[0052]In describing the second embodiment, the descriptions about the same or like parts as the first embodiment will be omitted for conciseness.

[0053]Referring to FIG. 3, the EEFL 20 includes an emissive glass tube 21 whose inner surface is coated with a phosphor 22, first and second non-emissive glass tubes 23 and 25 joined to both ends of the emissive glass tube 21, and first and second electrodes 24 and 26 formed on outer surfaces of the first and second non-emissive glass tubes 23 and 25. The non-emissive glass tube is different in thickness and diameter from the emissive glass tube 21.

[0054]The emissive glass tube 21 has a constant diameter Φ1 and a constant thickness t1.

[0055]The non-emissive glass tubes 23 and 25 have a diameter Φ2 larger than the diameter Φ1 of the emissive glass tube 21. Accordingly, the non-emissive glass tube has an expanded inner space. Also, the non-emissive glass tubes 2...

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PUM

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Abstract

A fluorescent lamp that can be easily manufactured to provide high brightness and high efficiency, a method of manufacturing the same, and a backlight unit having the same are provided. First and second non-emissive glass tube are joined to an emissive glass tube coated with a phosphor, and first and second electrodes are formed on outer surfaces of the first and second non-emissive glass tubes. The first and second non-emissive tubes may have the same diameter as the emissive glass tube. The first and second non-emissive glass tubes are simply joined to the emissive glass tube, thereby reducing the manufacturing process and cost. The first and second non-emissive glass tubes are formed to be thinner than the emissive glass tube, thereby enhancing the brightness and efficiency of the fluorescent lamp.

Description

[0001]This application claims the benefit of Korean Patent Application No. P2004-111737 filed in Korea on Dec. 24, 2004, which is hereby incorporated by reference for all purposes as if fully set forth herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a lamp, and more particularly, to a fluorescent lamp that can be easily manufactured to provide high brightness and high efficiency, a method of manufacturing the same, and a backlight unit having the same.[0004]2. Description of the Related Art[0005]Flat panel display devices include plasma display panels, field emission displays, light emitting diodes, and liquid crystal display devices (LCD).[0006]In an LCD, data signals are supplied to pixels arranged in an active matrix configuration and light transmittance is adjusted by the displacement of liquid crystal according to the supplied data signals to display an image.[0007]However, the LCD is not self-luminous and thus must receiv...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B33/10H01J9/24H01J9/20H01J9/00H01J65/00H01J61/06H01J11/00
CPCH01J9/266H01J65/046G02F1/133604G02F1/1335
Inventor YOON, JUNGHYUNHONG, JINWOO
Owner LG DISPLAY CO LTD
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