JP2003279982A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dirt and dust from entering into a lamp chamber in a liquid crystal display device in which a lamp chamber in which a straight tube type light source lamp is housed is provided at the back of its liquid crystal panel. <P>SOLUTION: In the liquid crystal display device which has a lamp chamber 9 in which a straight tube type light source lamp 16 is arranged at the back of a liquid crystal panel 7 and vent paths 14, 15 for exhausting air in the lamp chamber to the outside are provided at least at the upper part of the lamp chamber, the vent paths are formed in bent paths. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which a straight tube type light source lamp is arranged on the back surface of a liquid crystal panel which displays information depending on the presence or absence of transmitted light.

[0002]

2. Description of the Related Art Since the liquid crystal itself used in a so-called liquid crystal panel does not emit light, a backlight serving as a light source is arranged on the back surface of the liquid crystal panel for the purpose of improving brightness and making it visible in a dark place. ing.

On the other hand, as the above-mentioned backlight, a direct type backlight device in which a large number of straight tube type fluorescent lamps are arranged on the back surface of the liquid crystal panel is often used with the increase in size of the liquid crystal panel. A large amount of heat is generated from the lamp. For example, as disclosed in Japanese Patent Laid-Open No. 6-273765, a vent hole is provided on the upper surface of the lamp to discharge heat to the outside.

However, in the case of the above construction, since the ventilation hole is provided in the vicinity of the electrode of the lamp, there is a problem that dust or foreign matter is likely to enter the portion.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent dust and foreign matter from entering through a ventilation hole for heat dissipation as much as possible.

[0006]

The present invention has a lamp chamber in which a straight tube type light source lamp is arranged on the back surface of a liquid crystal panel, and the air in the lamp chamber is discharged to the outside at least at the upper part of the lamp chamber. In the case where the ventilation passage is provided, the ventilation passage is formed as a bent passage.

Further, according to the present invention, lamp holders are attached to both ends of the light source lamp, and storage grooves having a substantially U-shaped cross section for inserting and supporting the lamp holders are formed in the upper and lower walls of the lamp chamber. The air passage is formed at the bottom of the.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described first with reference to FIGS. 1 and 2. Reference numeral 1 is a relatively large and horizontally long liquid crystal panel having a size of 19 inches or more, and a pair of upper and lower members formed of a resin material. The supporting frames 2 and 3 are connected by the left and right sheet metal chassis 4 and 5 to form a frame-shaped frame.

Further, the support frames 2 and 3 and the chassis 4 and 5 have their front half portions expanded in a stepwise manner, and the liquid crystal panel 7 is disposed in the expansion step portions 6 ...

On the other hand, the rear end opening of the frame frame is closed by a back cover 8 to form a lamp chamber 9 behind the liquid crystal panel 7, and at least upper and lower wall surfaces of the lamp chamber. 10 and 11 are formed as inclined surfaces, and these surfaces are colored, for example, with high reflectance such as white to form reflecting surfaces.

Further, a storage groove 1 having a U-shaped cross section as shown in FIGS. 3 and 4 is provided at the rear end portions of the support frames 2 and 3.
2, ..., 13 ... Are integrally formed with a predetermined interval, and at the bottom of these storage grooves, there are ventilation passages 14 ... .. are integrally formed.

Reference numeral 16 ... Represents a light source lamp consisting of a straight tube type small fluorescent lamp. A lamp holder 17 ... Removable as shown in FIG. By being inserted into the housing grooves 12, ..., 13 ..., the lamps are arranged in the rear portion of the lamp chamber 9.

The lamp holders 17 ... Are provided with sockets 18 provided at both ends of the light source lamps 16 ... , And a terminal portion 19 provided with are integrally molded, and a power cord (not shown) is connected to the terminal portion.

Further, a step 2 is formed at the boundary between the socket portion 18 of the lamp holder 17 and the terminal portion 19 of the lamp holder.
0 .. is formed, and the supporting frames 2 and 3 are formed.
.., 22 .. corresponding to this are also formed in the storage grooves 12, ..., 13 ... of, and thereby the ventilation passages 14 ,. .

Further, even if the step portion 20 of the lamp holder 17 is brought into contact with the step portions 21, ..., 22 ..., the ventilation passages 14 ,. Are formed with stoppers 23, ..., 24 ...

With these configurations, the light source lamp 16 is provided.
.. When the temperature inside the lamp chamber 9 rises due to the emission of
The hot air in the lamp chamber 9 is exhausted from the ventilation passage 14 due to the draft due to the temperature rise, and the ventilation passage 15
The outside air is sucked into the lamp chamber 9 through and is cooled appropriately.

Further, when the light source lamps 16 ...
From 5 ..., foreign matter such as dust and dirt in the air enters the inside, but the above-mentioned step portions 21 .., 22 ...
By forming a curved path in the middle of 4, ..., 15 ..., for example, when the light source lamp 16 ...
Foreign matter that has entered the
When the light source lamps 16 are turned on, they adhere to the vicinity and are discharged to the outside due to the heat generated by light emission, so that they can be prevented from entering the lamp chamber 9.

It is to be noted that fitting grooves 25, ..., 26 into which the back cover 8 is fitted are integrally formed at the rear end portions of the support frames 2 and 3 and the back cover 8 is mounted on these portions. Then, the back cover abuts on the socket portion 18 of the lamp holder 17, ..

A sheet metal chassis 27 is used to fix and reinforce the support frames 2 and 3 and to fix them to, for example, a liquid crystal television body not shown.

[0020]

According to the structure of the present invention, since the ventilation passage for discharging the air in the lamp chamber to the outside is formed in the curved passage, the invasion of dust and dirt from the ventilation passage into the lamp chamber is prevented as much as possible. It is possible to prevent the occurrence of uneven brightness and the influence on the liquid crystal panel.

Further, according to the structure of the present invention, since the ventilation passage is formed at the bottom of the storage groove for inserting and supporting the lamp holders mounted on both ends of the light source lamp, the ventilation passage can be formed with a relatively simple structure. It can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention.

FIG. 2 is a side vertical sectional view of the same.

3 is a cross-sectional view taken along the line AA in FIG.

4 is a view on arrow B in FIG. 2. FIG.

FIG. 5 is a perspective view of an essential part according to the present invention.

[Explanation of symbols]

7 LCD panel 9 lamp room 12 storage groove 13 Storage groove 14 air passage 15 air passage 16 light source lamp 17 lamp holder

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuichi Tsubaki             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Keiichi Kishida             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Toshio Hashino             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. F term (reference) 2H089 HA40 JA10 QA06 TA18                 2H091 FA41Z GA01 LA04                 3K014 AA02 LA04 LB03

Claims (2)

[Claims] 1. A liquid crystal panel having a lamp chamber in which a straight tube type light source lamp is arranged on the back surface, and a ventilation path for discharging air in the lamp chamber to the outside is provided at least at the upper part of the lamp chamber, A liquid crystal display device, characterized in that the ventilation passage is formed in a curved passage. 2. A lamp holder is attached to each end of the light source lamp, and storage grooves having a substantially U-shaped cross section for inserting and supporting the lamp holder are formed in upper and lower walls of the lamp chamber, and the storage grooves are formed. A liquid crystal display device characterized in that the ventilation passage is formed at the bottom of the liquid crystal display device.