JP4126968B2 - Backlight device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a manufacturing cost of a reflector and the like for the arrangement of a substantially triangle-sectioned reflector behind and between fluorescent lamps. <P>SOLUTION: A backlight device comprises a lamp chamber 18, a plurality of linear tube type fluorescent lamps 20 arranged parallel in the lamp chamber, a reflecting plate 19 arranged on the back surface of the lamp chamber, and a plurality of substantially triangle-sectioned resin reflectors 22 each arranged between fluorescent lamps on the reflecting plate. The reflectors are coupled to and integrated with runners 23. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a backlight device that illuminates a liquid crystal display panel built in a liquid crystal display device from behind.
[0002]
[Prior art]
In a so-called direct type backlight device in which a plurality of illumination lamps are arranged on the back surface of a liquid crystal panel, as shown in, for example, Japanese Patent Application Laid-Open No. 5-257128, an illumination lamp BL and a support for supporting the lamp are provided. The lower case LCA holding the body BLS, the inverter circuit board IPCB, etc. is also used as a light reflecting plate, and a light reflecting mountain RM having a triangular cross section is integrally formed between the lamps of this case. When the size is larger than 15 inches, the mold of the lower case LCA is enlarged, and distortion due to thermal expansion and contraction during molding is likely to occur, which affects the display quality of the liquid crystal panel due to the occurrence of distortion. There's a problem.
[0003]
In addition, as shown in, for example, Utility Model Registration No. 3084289, there is a prism having a triangular cross section 3 arranged behind each of a plurality of parallelly arranged lamps. It is necessary to fix each to the reflector 2 accurately, and there is a problem that workability at the time of assembly is poor.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention aims to improve workability and the like when assembling the reflecting material in a case where a substantially triangular reflecting material is arranged on the back surface between the fluorescent lamps.
[0005]
[Means for Solving the Problems]
The present invention relates to a lamp chamber, a plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber, a reflector disposed on the back of the lamp chamber, and a cross section provided between the fluorescent lamps on the reflector. Is substantially triangular and includes a plurality of resin reflectors, these reflectors are connected to each other by a runner and are integrally formed , and the fluorescent lamp is supported by the runner. is there.
[0007]
Further, according to the present invention, the reflective material is divided into a plurality of pieces in the longitudinal direction, and the respective reflective materials are formed in the same shape.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will first be described with reference to FIG. 1. Reference numeral 1 denotes a relatively large and horizontally long liquid crystal display device of, for example, 15 inches or more, and an STN liquid crystal panel or TFT suitable for a large screen on the front surface of the backlight device 2. A liquid crystal display 3 constituted by a liquid crystal panel is connected.
[0009]
On the other hand, as shown in FIG. 2, the backlight device 2 is made of a transparent resin such as acrylic or polycarbonate having a thickness of about 2 to 3 mm in the opening 5 of the bottom case 4 having a bottomed box shape. The light diffusing plate 6 is arranged, and the light diffusing plate 6 is arranged on the front surface of the light diffusing plate.
[0010]
In addition, a flange 8 is integrally formed at the opening 5 mouth edge of the bottom case 4 by bending the portion outward, and the outer peripheral edge of the light diffusion plate 6 and the like is placed on the flange. In addition, a center chassis 9 formed by bending a sheet metal into a substantially L-shape is fastened to the flange portion 8 with screws 10, and the light diffusion plate 6 and the center piece 11 and the flange portion 8 are Sheets are fixed.
[0011]
Further, the liquid crystal display 3 encloses liquid crystal between two glass substrates 12 and 12 with transparent electrodes, and optical sheets 13 and 13 such as a deflector plate and a phase difference plate are arranged before and after these glass substrates. The liquid crystal panel 14 configured as described above is placed on the front surface of the upper piece 11 of the center chassis 9, and an outer frame 15 made of a molded metal thin plate having a substantially L-shaped cross section is attached to the center chassis 9 with screws 16. The liquid crystal panel 14 is fixed between the upper piece 11 of the center chassis 9 and the front side 17 of the outer frame 15 by being stopped.
[0012]
In addition, a lamp chamber 18 is defined in the inside of the bottom case 4, and on the inner surface of the bottom case 4, a reflector 19 whose inner surface is colored white with high light reflectance is disposed, and Inside the lamp chamber 18, a plurality of fluorescent lamps 20... Composed of cold cathode fluorescent tubes, hot cathode fluorescent tubes and the like are accommodated in a so-called direct type.
[0013]
21 and 21 are reflectors which are disposed on the bottom surface of the reflection plate 19 and are integrally formed of a resin material such as polycarbonate. As shown in FIGS. 3 and 4, the back surface between the fluorescent lamps 20. These reflectors are integrally formed by a runner 23... So that the reflectors 22. The reflectors 21 and 21 are formed by screwing screws 25... From the back of the bottom case 4 into screw holes 24. 4 is fixed.
[0014]
The reflectors 21 and 21 are entirely made of a highly reflective grade material, or the reflecting surface facing the fluorescent lamp 20... Is colored in a white system having a high reflection efficiency to emit from the fluorescent lamp 20. The reflected light is configured to be reflected toward the light diffusing plate 6.
[0015]
In addition, the reflectors 21 and 21 are divided into left and right parts in the longitudinal direction, and these are formed in the same shape, so that mass production can be performed efficiently with the same mold, and the liquid crystal Even if the panel 14 is enlarged, it is possible to prevent the mold from being enlarged and to reduce the cost of the mold. Since the reflectors 21 and 21 are downsized, it is easy to secure a storage space for parts, and productivity can be improved.
[0016]
Furthermore, the runners 23 are set to have the same thickness as the mounting height of the fluorescent lamps 20 and are in contact with the fluorescent lamps 20 and so as to use these supports as well.・ It is possible to prevent the occurrence of uneven brightness due to deformation and damage caused by vibration during transportation.
[0017]
On the other hand, the inside of the reflecting material 22... Is formed in a hollow shape, and the lead wires 26... On the ground side of the adjacent fluorescent lamps 20. The lengths of the lead wires of the lamps 20... Are configured to be substantially the same, thereby setting the circuit impedances to be substantially the same, and the inverter circuit for supplying power to the fluorescent lamps 20. It is configured to operate.
[0018]
In the above embodiment, the reflectors 21 and 21 are fixed to the bottom case 4 with screws 25... However, the present invention is not limited to this, and the reflectors 21 and 21 may be fixed with an adhesive or the like. The internal structure, the shape of the runners 23,.
[0019]
【The invention's effect】
According to the configuration of the present invention, in the case where a plurality of reflectors are arranged in a substantially triangular shape on the back surface between the fluorescent lamps, the reflectors are integrally formed by connecting these reflectors with a runner. In addition to simplifying the process, the number of reflector assembly steps can be greatly reduced, and work efficiency can be improved.
[0020]
Also, with the configuration of the present invention, the fluorescent lamp is supported by the runner, so that it is possible to prevent luminance unevenness due to deformation of the fluorescent lamp, breakage during transportation, etc. without providing a dedicated fluorescent lamp support member. It is.
[0021]
In addition, the structure of the present invention allows the reflector to be divided into a plurality of parts in the longitudinal direction with the same shape, thereby preventing an increase in the size of the mold associated with an increase in the size of the liquid crystal panel and efficiently molding with a small mold This makes it easy to secure a storage space and improve productivity.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a liquid crystal display device using the present invention.
FIG. 2 is a side longitudinal sectional view of the main part of the same.
FIG. 3 is a plan view showing an embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
18 Lamp chamber 19 Reflector 20 Fluorescent lamp 22 Reflector 23 Runner

Claims (2)

The lamp chamber, a plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber, a reflector disposed on the back of the lamp chamber, and a cross section provided between the fluorescent lamps on the reflector are substantially In a triangular shape including a plurality of resin reflectors, these reflectors are integrally connected to each other by a runner , and the fluorescent lamp is supported by the runner. Backlight device to do. The backlight device according to claim 1, wherein the reflective material is divided into a plurality of pieces in the longitudinal direction, and the reflective materials are formed in the same shape.

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