JP2004294785A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device that is expected to sufficiently radiate heat although the manufacture is facilitated to easily reduce costs and any special surface processing is unnecessary. <P>SOLUTION: A frame member 12 where a liquid crystal panel 11 is positioned is made of resin as a basic material. A heat radiation component 13 which radiates heat from the liquid crystal panel to the outside is made of metal. The frame member is provided with a storage part 16 which houses the liquid crystal panel. The heat radiation component is provided with an abutting part 21 which is disposed in the storage part and abuts against an outer peripheral edge of the liquid crystal panel and a heat radiation part 23 which extends from the abutting part to be exposed on an outer surface of the frame member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly, to a structure for promoting heat radiation of a liquid crystal panel.
[0002]
[Prior art]
Recently, various types of liquid crystal display devices have been developed, and are used in, for example, projectors and rear projection televisions. Liquid crystal display devices have been reduced in size by pursuing cost reduction of liquid crystal panels and portability of projectors and the like. In addition, high brightness is being promoted so that images can be clearly displayed even in a bright room. Due to these factors, heat is accumulated in the liquid crystal display device, causing pixel displacement due to expansion and contraction of the material due to the heat, and shortening the life of the liquid crystal panel.
[0003]
As a measure against heat radiation of a liquid crystal display device, it has been proposed to mold a frame member holding a liquid crystal panel with metal instead of resin (see Patent Document 1). Further, it has been proposed that the frame member is made of resin and a heat radiation member for promoting heat radiation is attached to the frame member (see Patent Documents 2 and 3). In the latter case, the liquid crystal panel and the heat radiating member are assembled to the frame member.
[0004]
[Patent Document 1]
JP, 2003-15104, A
[Patent Document 2]
JP-A-11-64860
[Patent Document 3]
JP-A-11-352508
[Problems to be solved by the invention]
However, a structure in which the frame member is made of metal requires press working, and in addition, a shaving press or blasting may be required to deburr the frame member. Further, in order to prevent the corrosion of the surface of the frame member, surface treatment such as plating, painting, and alumite is required, and an inspection in which it is difficult to determine a hue, color unevenness, or the like is required. In addition, a portion having strict dimensional accuracy causes a cost increase as compared with a resin-made portion.
[0008]
Therefore, an object of the present invention is to provide a liquid crystal display device which can be easily manufactured, can easily reduce the cost, does not require special surface treatment, and can expect sufficient heat radiation.
[0009]
[Means for Solving the Problems]
According to one aspect of the present invention, the liquid crystal panel includes a frame member made of a resin as a basic material for positioning the liquid crystal panel, and a metal heat dissipation component for dissipating heat from the liquid crystal panel to the outside, The frame member has a housing portion for housing the liquid crystal panel, the heat dissipating component is located in the housing portion and is in contact with an outer peripheral edge of the liquid crystal panel; A liquid crystal display device having a heat radiating portion extending to be exposed on the outer surface is obtained.
[0010]
The housing portion is formed on one surface of the frame member, the frame member has a rim defining an opening penetrating the housing portion on the opposite surface, and the abutment portion is provided on the rim. It may be arranged.
[0011]
The frame member may have a through hole formed in the rim portion, and the heat radiating portion may be fitted in the through hole and exposed on the opposite surface.
[0012]
The heat dissipating component may be molded into the frame member, and the heat dissipating portion may pass through the frame member and be exposed on the opposite surface.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
A liquid crystal display according to a first embodiment of the present invention will be described with reference to FIG.
[0014]
The illustrated liquid crystal display device is a transmissive liquid crystal display device used for a liquid crystal projector or a rear projection television, and includes a liquid crystal panel 11 having a well-known structure, and a case or a frame member made of a resin for positioning the liquid crystal panel 11 as a basic material. 12 and a heat dissipating component 13 made of metal having good heat conduction for dissipating heat generated from the liquid crystal panel 11 to the outside. Dust-proof glasses 14 and 15 are fixed to both surfaces of the liquid crystal panel 11.
[0015]
As best shown in FIG. 2, the frame member 12 has a housing portion 16 formed of a substantially rectangular recess for housing the liquid crystal panel 11. The housing portion 16 is formed on one surface (the upper surface in FIG. 1) of the frame member 12. A rectangular opening 17 is formed in the bottom wall of the housing 16. In other words, the frame member 12 has a lip 18 that defines an opening 17 that penetrates the housing 16 through the opposite surface (the lower surface in FIG. 1). At least one through hole 19 is partially formed in the rim portion 18. The through-hole 19 is formed as a long hole along the opening 17, but may include a plurality of small holes.
[0016]
The heat dissipating component 13 has a contact portion 21 arranged in the housing portion 16. The contact portion 21 is formed in a rectangular frame shape along the edge 18 of the frame member 12 as shown in FIG. The outer peripheral edge 22 of the liquid crystal panel 11 is in contact with the contact portion 21. As a result, the contact portion 21 is sandwiched between the edge 18 of the frame member 12 and the outer peripheral edge 22 of the liquid crystal panel 11.
[0017]
The heat dissipating component 13 further has a heat dissipating part 23 composed of a leg projecting vertically downward from the lower surface of the contact part 21. The heat radiating portion 23 is press-fitted into the through hole 19. Therefore, the number of heat radiating portions 23 is the same as the number of through holes 19. The lower end surface of the heat radiating portion 23 is formed substantially flush with the lower surface of the frame member 12.
[0018]
Now, when light enters the liquid crystal panel 11, a predetermined display operation is performed in the same manner as in a conventional transmission type liquid crystal display device. At that time, the liquid crystal panel 11 generates heat. The heat is transmitted from the outer peripheral edge 22 of the liquid crystal panel 11 to the contact portion 21 of the heat dissipating component 13 as shown by the arrow 24, and is further effectively dissipated downward in FIG. You. Therefore, the accumulation of heat in the liquid crystal display device is prevented or reduced. Actually, the heat dissipating effect is further improved by bringing the heat dissipating portion 23 into contact with a counter substrate, a TFT substrate, a housing, or the like (not shown).
[0019]
The method of manufacturing the liquid crystal display device of FIG. 1 will be described with reference to FIGS.
[0020]
First, a frame member 12 and a heat radiating component 13 having the shape shown in FIG. 2 are prepared. The frame member 12 can be manufactured by resin molding. The heat dissipating component 13 can be manufactured by subjecting a metal plate to press working or the like. Note that the heat radiating portion 23 shown in FIG. 1 is formed by forming a plurality of finger pieces integrally on the outer peripheral edge of the contact portion 21 by pressing and bending the finger pieces to one surface side at a right angle. You may.
[0021]
Next, the heat radiating component 13 is inserted into the housing portion 16 of the frame member 12. That is, the contact portion 21 is arranged at the rim portion 18 while the heat radiation portion 23 is press-fitted into the through hole 19 of the frame member 12.
[0022]
Further, the outer peripheral edge 22 of the liquid crystal panel 11 is placed on the contact portion 21, and the outer peripheral edge 22 and the contact portion 21 are bonded using a resin having a low linear expansion coefficient. Thereby, the material of the heat radiating component 13 can be selected substantially depending on the thermal conductivity.
[0023]
According to the above-described liquid crystal display device, both the frame member 12 and the heat radiating component 13 can be easily manufactured. In addition, since the frame member 12 is made of a resin, it is not necessary to perform a special process or inspection. A heat radiation effect can be obtained.
[0024]
It is possible to design the heat radiation component 13 so that a portion where a burr is expected to occur does not appear on the surface of the frame member 12. In addition, since the heat radiating component 13 only needs to have a function of radiating heat, the shape is simplified, and strict dimensional accuracy is not required.
[0025]
A liquid crystal display device according to a second embodiment of the present invention will be described with reference to FIGS. Portions having similar functions are denoted by the same reference numerals, and description thereof is omitted.
[0026]
The illustrated liquid crystal display device is also a transmission type liquid crystal display device used for a liquid crystal projector or a rear projection television. This liquid crystal display device uses a heat dissipation component 41 instead of the heat dissipation component 13 in the liquid crystal display device described with reference to FIGS. The heat dissipating component 41 is formed by pressing a metal plate or the like, and a plurality of, here five, heat dissipating portions 53 are integrally formed on an outer peripheral portion of a rectangular frame-shaped contact portion 51. I have. The heat radiating portions 53 all have a shape protruding toward one surface side of the contact portion 51 and further bending outward from the protruding end.
[0027]
The frame member 12 is formed by molding using a resin as a basic material. When forming the frame member 12, the heat dissipating component 41 is molded in. At the time of mold-in, as shown in FIG. 4, the heat radiating portion 53 is exposed to the lower surface of the frame member 12. The lower end surface of the heat radiating portion 53 is formed substantially flush with the lower surface of the frame member 12.
[0028]
Further, the outer peripheral edge 22 of the liquid crystal panel 11 is placed on the contact portion 51, and the outer peripheral edge 22 and the contact portion 51 are bonded using a resin having a low linear expansion coefficient. Thereby, the material of the heat radiation component 41 can be selected substantially depending on the thermal conductivity.
[0029]
Now, when light enters the liquid crystal panel 11, a predetermined display operation is performed in the same manner as in a conventional transmission type liquid crystal display device. At that time, the liquid crystal panel 11 generates heat. The heat is transmitted from the outer peripheral edge 22 of the liquid crystal panel 11 to the contact portion 51 of the heat dissipating component 41 as shown by the arrow 54, and is further effectively dissipated downward through FIG. 4 through the heat dissipating portion 53 of the heat dissipating component 41. You. Therefore, the accumulation of heat in the liquid crystal display device is prevented or reduced. Actually, the heat radiation effect is further improved by bringing the heat radiation portion 53 into contact with a counter substrate, a TFT substrate, a housing, or the like (not shown).
[0030]
According to the above-described liquid crystal display device, both the frame member 12 and the heat dissipating component 41 can be easily manufactured. In addition, since the frame member 12 is made of resin, it is not necessary to perform a special process or inspection, but it is sufficient. A heat radiation effect can be obtained.
[0031]
It is possible to design the heat radiation component 41 so that a portion where the burr is assumed to be generated does not appear on the surface of the frame member 12. Further, since the heat dissipating component 41 only needs to have a function of dissipating heat, the shape is simplified, and strict dimensional accuracy is not required, so that the life of the production equipment is extended.
[0032]
The heat radiating component 13 or 41 is made of an aluminum alloy, a magnesium alloy, a copper alloy, an iron-nickel alloy, or the like, and is formed by a method such as die casting, molten metal molding, or MIM (metal / injection / molding). You may. Further, the case where the press-fitting is used and the case where the mold-in is used are exemplified for assembling the heat radiating component 13 or 41 and the frame member 12, but other means such as welding may be used.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a liquid crystal display device which can be easily manufactured, can be easily reduced in cost, does not require a special surface treatment, and can expect sufficient heat radiation. Can be.
[Brief description of the drawings]
FIG. 1 is a sectional view of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view for explaining an assembling operation of a frame member and a heat radiating component in the liquid crystal display device of FIG.
FIG. 3 is a sectional view of only a main part showing an assembled state of a frame member and a heat radiation component in the liquid crystal display device of FIG. 1;
FIG. 4 is a cross-sectional view of only a main part of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 5 is a perspective view for explaining an assembling operation of a frame member and a heat radiating component in the liquid crystal display device of FIG.
6 is a cross-sectional view of only a main part showing an assembled state of a frame member and a heat radiating component in the liquid crystal display device of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Liquid crystal panel 12 Case or frame member 13 Heat dissipating parts 14, 15 Dustproof glass 16 Housing part 17 Opening 18 Edge part 19 Through hole 21 Contact part 22 Outer periphery 23 of liquid crystal panel Heat dissipating part 41 Heat dissipating component 51 Contact part 53 Heat dissipation Department

Claims (4)

A liquid crystal panel, a frame member made of resin as a basic material for positioning the liquid crystal panel, and a metal heat radiating component for dissipating heat generated from the liquid crystal panel to the outside, wherein the frame member houses the liquid crystal panel A heat-radiating component, wherein the heat-dissipating component has a contact portion located in the housing portion and in contact with an outer peripheral edge of the liquid crystal panel, and heat radiation extending from the contact portion to be exposed on an outer surface of the frame member. And a liquid crystal display device. The housing portion is formed on one surface of the frame member, the frame member has a rim defining an opening penetrating the housing portion on the opposite surface, and the contact portion is formed on the rim. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is arranged. 3. The liquid crystal display device according to claim 2, wherein the frame member has a through hole formed in the rim portion, and the heat radiating portion is fitted in the through hole and is exposed on the opposite surface. 3. The liquid crystal display device according to claim 2, wherein the heat radiating component is molded into the frame member, and the heat radiating part is exposed on the opposite surface through the frame member. 4.

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