JP4147843B2 - Backlight device - Google Patents

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. 2001-13881, a harness for supplying power to a fluorescent lamp for backlight In order to prevent the lamp from being turned off due to the length of the lamp and the occurrence of uneven brightness, a harness is connected to each of the lamps and wired behind the reflector. In this case, since the fitting hole 11 is provided in the reflecting plate and the harness needs to be wired to the back side of the reflecting plate through the fitting hole, it is necessary to connect the connector after passing the harness through the fitting hole. When the harness is directly connected to both ends of the lamp, it is difficult to supply the lamp and the harness to which the connector is connected as a set component, and there is a problem that workability is deteriorated.
[0003]
Moreover, in the above conventional configuration, it is necessary to secure a space for wiring on the back side of the reflecting plate 4, and there is a problem that the depth dimension of the apparatus is increased.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve workability at the time of wiring of a lead wire for supplying power to a fluorescent lamp, and to reduce the size of the apparatus.
[0005]
[Means for Solving the Problems]
The present invention provides a lamp chamber, a plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber, a reflector disposed on the back surface of the lamp chamber, and the fluorescent lamp on the reflector between the fluorescent lamps. and in which cross section is provided with a plurality of resinous reflector at substantially triangular shape, the interior of the reflector constructed in hollow each integrally forming a wiring groove, the fluorescent lamp in this hollow groove The lead wire is wired, the lead wire wired in the wiring groove is the ground side, and the lead wire of the fluorescent lamp arranged adjacent to the interval of the one reflecting material is wired .
[0007]
Further, according to the present invention, a partition wall formed with a screw hole into which a fixing screw is screwed into a substantially central portion of the reflector is integrally formed so as to divide the wiring groove into left and right parts, and lead wires are provided in these wiring grooves. Are wired one by one.
[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 FIGS. 2 and 3, the backlight device 2 is made of 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 with the front opened. A light diffusing plate 6 made of a translucent resin such as is disposed, and a sheet in which a light collecting sheet 7 is laminated on the front surface of the light diffusing plate.
[0010]
2 is a cross-sectional view taken along the line AA in the state where the backlight device 2 and the liquid crystal display 3 are combined, and FIG. 3 is a cross-sectional view taken along the line BB.
[0011]
Further, at the opening edge of the long side of the bottom case 4 opening portion, as shown in FIG. 2, the flange portion 8 is bent outward to integrally form the flange portion 8. The outer peripheral edge of the light diffusing plate 6 or the like is placed, and a long side center chassis 9 in which a sheet metal is bent in a substantially L shape is fastened to the flange portion 8 with screws 10. The light diffusing plate 6 and the sheets are fixed by the piece 9 a and the flange portion 8.
[0012]
On the other hand, at both ends on the short side of the bottom case 4, as shown in FIG. 3, a sheet metal constituting a frame-shaped center chassis connected to the long side center chassis 9 at the corner is formed. A short-side center chassis 11 bent into a substantially L-shape is fixed to the bottom case 4 with screws 12... And a resin lamp support frame 13 is formed inside the short-side center chassis. Sheet support frames 14 are stacked and arranged. The lamp support frame 13 is fixed to the bottom case 4 with screws 15, and the sheet support frame 14 is fixed to the short side center chassis 11 with screws 16.
[0013]
Further, the liquid crystal display 3 encloses liquid crystal between two glass substrates 17 and 17 with transparent electrodes, and optical sheets 18 and 18 such as a deflector plate and a retardation plate are arranged before and after these glass substrates. The liquid crystal panel 19 configured as described above is placed on the front surfaces of the upper pieces 9a and 11a of the long side center chassis 9 and the short side center chassis 11, and is a molded product of a thin metal plate having a substantially L-shaped cross section. The upper frame 9a, 11a of the center chassis 9, 11 and the front side 20a of the outer frame 20 are fixed to the center chassis 9, 11 with screws 21. The liquid crystal panel 19 is fixed between them.
[0014]
In addition, a lamp chamber 22 is defined in the inside of the bottom case 4, and on the inner surface of the bottom case 4, there is disposed a reflector 23 whose inner surface is colored white with high light reflectance, and Inside the lamp chamber 22, a plurality of fluorescent lamps 24 made of cold cathode fluorescent tubes are arranged side by side in a so-called direct type.
[0015]
Reference numerals 25 and 25 are reflectors which are disposed on the bottom surface of the reflecting plate 23 and are integrally formed of a resin material such as polycarbonate. As shown in FIG. These reflective materials are integrally molded by runners 27 so that the substantially triangular reflective materials 26 are positioned. The reflectors 25, 25 are formed by screwing screws 29,... From the back surface of the bottom case 4 into screw holes 28,. 4 is fixed.
[0016]
The reflectors 25 and 25 are entirely formed of a highly reflective grade material, or the reflecting surface facing the fluorescent lamp 24... Is colored in a white system having a high reflection efficiency, and is emitted from the fluorescent lamp 24. The reflected light is configured to be reflected toward the light diffusing plate 6.
[0017]
In the above embodiment, the reflectors 26 are connected by the runners 27 to form the reflectors 25. However, the reflector 26 is not limited to this, and the fluorescent lamps 24,. A plurality of the same length may be formed, and the back surface thereof may be fixed to the reflection plate 23 with a screw, an adhesive, an adhesive tape or the like.
[0018]
On the other hand, the inside of the reflectors 26 is formed in a hollow shape, and two lead wires 30 on the ground side of the adjacent fluorescent lamps 24 are wired to the reflectors 26 at intervals of two. The wiring grooves 31 are integrally formed so that the lengths of the lead wires of the fluorescent lamps 24 are as short as possible and substantially the same. It is configured such that an inverter circuit or the like that supplies power to the fluorescent lamps 24 operates stably by preventing occurrence of luminance unevenness or setting circuit impedances to be substantially the same.
[0019]
Further, as shown in FIGS. 3 and 5, the lead wires 30... And the lead wires 32... Of the fluorescent lamps 24. After being pulled out from the groove 33, the connector is taken out through the notch groove 35 formed in the bottom case 4 through the gap 34 of the short side center chassis 11 shown in FIG. 36.. Are connected to a circuit board of an inverter circuit (not shown) (for example, high-frequency power having a frequency of 50 kHz and a voltage of 1200 V is supplied).
[0020]
In the above-described embodiment, the ground-side lead wires 30... Are wired to the reflecting material 26..., And as shown in FIG. .., And when this portion is used as a separator for separating and wiring the lead wires 30..., The reflectors 26,. Although the weight can be reduced and the cost can be reduced by reducing the material, one lead wire may be wired to one reflector. In addition, the wiring path of the lead wires 30 and 31 is not limited to the above embodiment, and for example, a wiring groove may be formed in a joint portion between the lamp support base 13 and the sheet support base 14 and drawn out from the portion. Also in the cutout grooves 34... Formed in the bottom case 4, a drawer hole may be drilled in the back surface portion of the bottom case.
[0021]
Furthermore, in the above embodiment, the lead wire 30 on the ground side is wired to the reflector 26 to shorten the wiring length of the lead wire 32 on the power supply side as much as possible, and the luminance is reduced due to the occurrence of leakage current. It is possible to reduce the size of the backlight device 2 with respect to the screen size of the liquid crystal panel 19, but it is not limited to this. Instead, the power supply side lead wires 32 may be wired to the reflector 26.
[0022]
Thus, when wiring the lead wires 30 and 32, after the fluorescent lamps 24 are set on the lamp support 13 and the reflector 23 is set inside the bottom case 4, the two sets are combined. The reflectors 25 are fixed to the bottom case 4 with screws 29 while the ground-side lead wires 30 are accommodated in the wiring grooves 31. Thereafter, after the sheet support 14 is placed on the lamp support 13, the light diffusion plate 6 and the like are placed in the opening 5 of the bottom case 4, and then the long side center chassis 9 and the short side center chassis 11. Are combined in advance and covered with the light diffusion plate 6 or the like, and then fixed to the bottom case 4 or the support bases 13 and 14, and the liquid crystal panel 19 is placed on the upper pieces 9a and 11a of the center chassis 9 and 11, respectively. Then, put the outer frame 20 on the front surface and fasten the screws 21.
[0023]
In the above-described embodiment, the lead lamps 30... 32... Are connected to both ends of the fluorescent lamps 24... In advance, and the lead wires connectors 36. However, the present invention is not limited to this, and the lead wire may be detachably connected to the fluorescent lamp. Further, the assembly order in the above embodiment is not limited to this, and may be set as appropriate in consideration of the work process and the like.
[0024]
FIGS. 6 and 7 show another embodiment of the reflecting material 26. FIG. 6 shows the wiring groove 31 formed by hollowing the entire interior, and the reflecting material can be configured to be lightweight and inexpensive. . FIG. 7 shows an example in which a partition portion 37 having a screw hole 28 formed in the inner central portion is integrally formed, and a pair of wiring grooves 31 and 31 are formed on the left and right sides of the bottom portion. Thus, the influence of high frequency noise due to the approach of the lead wires 30 and 30 can be prevented as much as possible. To further prevent high frequency noise, a shield material is embedded in the partition portion 37 integrally. Alternatively, a shielding metal powder or the like may be mixed into the resin material constituting the reflecting material 26.
[0025]
【The invention's effect】
According to the configuration of the present invention, a wiring groove is formed in the reflector disposed on the back surface between the fluorescent lamps on the bottom surface of the reflector, and the lead wire of the fluorescent lamp is wired in this wiring groove, so that the proximity position of the fluorescent lamp It is possible to improve the workability during wiring and to reduce the size by reducing the wiring space.
[0026]
In addition, the configuration of the present invention simplifies the wiring work of the lead wires to the reflective material by wiring two lead wires on the ground side at intervals of one reflective material and wiring the lead wires on the power supply side. The length can be shortened, thereby preventing a lighting failure of the fluorescent lamp due to a voltage drop or leakage current.
[0027]
Further, according to the configuration of the present invention, a partition wall having a screw hole for fixing is formed integrally at the substantially central portion of the reflecting material, and the partition wall is divided into two on the left and right sides by this partition wall, so that the partition wall is The wiring work into the wiring groove of the lead wire can be efficiently performed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a liquid crystal display device using the present invention.
2 is a cross-sectional view taken along the line AA in a state in which the liquid crystal display device of FIG. 1 is assembled.
FIG. 3 is a cross-sectional view taken along the line BB.
4 is a sectional view taken along the line CC in FIG. 1. FIG.
FIG. 5 is a partially exploded perspective view of a main part of the present invention.
FIG. 6 is a side longitudinal sectional view showing another embodiment of the reflecting material according to the present invention.
FIG. 7 is a side longitudinal sectional view showing still another embodiment.
[Explanation of symbols]
22 Lamp chamber 23 Reflector 24 Fluorescent lamp 26 Reflector 26a Reflector 28 Screw hole 29 Screw 30 Lead wire 31 Wiring groove 32 Lead wire 37 Partition wall

Claims (2)

A lamp room,
A plurality of straight tubular fluorescent lamps arranged in parallel in the lamp chamber;
A reflector disposed on the back of the lamp chamber;
In the one provided between the fluorescent lamps on the reflecting plate and a plurality of resin reflecting materials having a substantially triangular cross section,
Integrally forming a wiring trench constitutes the inside of each of these reflector each hollow,
Wire the lead wire of the fluorescent lamp to this hollow groove,
The lead wire wired in this wiring groove is the ground side,
Backlight apparatus, characterized in that the wire leads of the fluorescent lamp disposed adjacent to one interval of the reflective material. A partition wall formed with a screw hole into which a fixing screw is screwed into a substantially central portion of the reflecting material is integrally formed to project, and the wiring groove is divided into left and right parts,
The backlight device according to claim 1, wherein the lead wires are wired one by one in the wiring grooves.

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