JP2004333670A - Liquid crystal display device and electronic appliance equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which heat dissipation efficiency is improved by letting out heat produced by a light source into a fixture interconnecting a liquid crystal display unit to a hinge and an electronic appliance equipped with the liquid crystal display device. <P>SOLUTION: An opposing part 10 placed opposite to a lower end part of the liquid crystal display unit 3, where the light source 5 is disposed, is formed on the fixture 6 which is fixed to a side face of the liquid crystal display unit 3 and of which the one end part 8 extended from its side face is interconnected to the hinges 12, 14. A heat conducting member 11 is closely stuck to the opposing part 10 and the lower end part of the liquid crystal display unit 3 and interposed between them. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device having a light source for emitting light from the back side of a liquid crystal panel and an electronic apparatus having the same, and more particularly, to connecting heat generated from the light source to a hinge of the liquid crystal display unit. The present invention relates to a liquid crystal display device to be released to a fixture and an electronic device provided with the liquid crystal display device.
[0002]
[Prior art]
Conventionally, as a liquid crystal display device of an electronic device such as a notebook computer, a light source such as a fluorescent lamp is arranged on an end face of a light guide plate, and the light from the light source is guided to the back side of the liquid crystal panel using the light guide plate. 2. Description of the Related Art There is known an edge light type backlight type liquid crystal display device which illuminates a liquid crystal panel.
[0003]
The light source also emits heat along with light emission, and particularly when a fluorescent lamp is used as the light source, a large amount of heat is generated at the electrode portions at both ends of the fluorescent lamp, and in some cases, a resin material such as a light guide plate or a housing is deformed or deformed. There is a risk of causing deterioration or malfunction or malfunction of each component. In addition, uneven brightness may occur in the liquid crystal panel due to the influence of heat.
[0004]
Therefore, in Patent Document 1, for example, a heat radiating member is provided so as to cover the electrode portion of the fluorescent lamp, and the heat generated by the fluorescent lamp is radiated to the outside through the heat radiating member. The heat dissipating member is formed of copper foil and is adhered to the surface of the reflector film near the electrode of the fluorescent lamp.
[0005]
[Patent Document 1]
JP-A-10-106329
[0006]
[Problems to be solved by the invention]
However, in recent years, the brightness of the liquid crystal panel has been promoted, and the amount of heat generated by the fluorescent lamp tends to increase accordingly. Only in a limited heat radiation area, it is difficult to obtain a sufficient heat radiation effect.
[0007]
The present invention has been made in view of the above-described problems, and has as its object to dissipate heat from a light source to a fixture for connecting a liquid crystal display unit to a hinge to improve a heat radiation efficiency. An object of the present invention is to provide an electronic device provided with this.
[0008]
[Means for Solving the Problems]
In solving the above problems, in the liquid crystal display device of the present invention, the light source is disposed on a fixture fixed to the side surface of the liquid crystal display unit and having one end extending from the side surface connected to the hinge. The liquid crystal display unit is characterized in that an opposing portion facing the end portion is formed, and a heat conducting member is interposed between the opposing portion and the end portion of the liquid crystal display unit.
[0009]
In solving the above problems, in the electronic device of the present invention, a liquid crystal display device is rotatably attached to a main body via a hinge, and the liquid crystal display device is fixed to a side surface of the liquid crystal display unit. And a mounting part whose one end extending from the side surface is connected to the hinge is formed with a facing portion facing the end portion of the liquid crystal display unit where the light source is disposed, and the facing portion and the liquid crystal display unit are formed. A heat conductive member is interposed between the end and the end.
[0010]
When the light from the light source is incident on the light incident end face of the light guide plate, the light is guided to the light guide plate or the like to illuminate the liquid crystal panel from the back side. The mounting connects the liquid crystal display unit to the hinge to enable the liquid crystal display unit to rotate with respect to the main body. A heat conducting member interposed between the end of the liquid crystal display unit in which the light source is disposed and the facing portion of the mounting fixture formed opposite to the liquid crystal display unit serves as a heat transfer for releasing heat generated from the light source to the mounting fixture. It functions as a path and eliminates the intervening air between the end of the liquid crystal display unit and the facing part of the fixture to increase the heat transfer efficiency. This makes it possible to suppress overheating of the light source by diffusing the heat generated from the light source to the fixture through the heat conducting member by utilizing the heat radiation effect of the heat flowing to the lower temperature portion.
[0011]
The attachment extends along the side surface of the liquid crystal display unit and is fixed to the side surface to support the liquid crystal display unit so that the liquid crystal display unit can perform a reliable rotation operation stably. As described above, since the surface area is larger than that of the heat dissipating member provided outside the liquid crystal display unit and provided only in the electrode portion of the light source as in Patent Literature 1, the heat radiation efficiency can be increased as compared with Patent Literature 1. it can.
[0012]
In addition, since a fixture originally provided as a connector between the hinge and the liquid crystal display unit is used as a heat radiator without providing a separate heat radiator, it is easy without increasing the planar dimensions and weight and changing the design. In addition, the heat radiation efficiency can be improved. In particular, in recent years, miniaturization has been promoted, and it is difficult to secure a space for incorporating a new member in a liquid crystal display device, and it is very effective to use an original fixture as a radiator.
[0013]
The heat conducting member has a function of eliminating air between the liquid crystal display unit and the fixture, which hinders heat conduction, as well as having a high thermal conductivity. For example, a sheet-like material having elasticity and being able to adhere to both can be used. In addition, if it has elasticity, a buffering action for protecting the liquid crystal display unit from external impact can be obtained. Specifically, acrylic rubber, silicon rubber, and the like can be given. Alternatively, a sheet in which a foil of silver, copper, aluminum, or the like is attached to a gel-like sheet may be used. Alternatively, a plate-like member such as silver, copper, or aluminum may be sandwiched between acrylic rubber, silicon rubber, or the like.
[0014]
Alternatively, solder may be used as the heat conducting member, and the end of the liquid crystal display unit and the facing portion of the fixture may be joined by solder, and the solder joint may function as a heat transfer path from the light source to the fixture. In addition, the gap between the end of the liquid crystal display unit and the facing part of the fixture may be filled with a heat conductive adhesive.
[0015]
Furthermore, you may use the cooling gel which has excellent heat dissipation in addition to heat conductivity. For example, a high-molecular polymer is made into a gel-like sheet by adding moisture to the sheet, and the heat of vaporization when the moisture contained in the sheet evaporates by heat is used. The rise can be further suppressed.
[0016]
As a characteristic required for the material of the fixture, in addition to heat dissipation, a strength that can withstand a rotating operation is required. For example, aluminum, copper, silver, Al-Cu type (JIS symbol 2011, 2017, 2017, 2012, 2117, 2018, etc.), Al-Mn type (JIS symbol 3003, 3004, 3005, etc.), Al-Si type (JIS symbol 4032) , 4043), Al-Mg based (JIS symbols 5052, 5056, 5083, 5N01 etc.), Al-Mg-Si based (JIS symbols 6061, 6063, 6262 etc.), Al-Zn-Mg based (JIS symbols 7075, 7N01) , 7003).
[0017]
Further, for example, in the case of a fixture applied to a large-sized liquid crystal display unit, if it is desired to increase the strength, the fixture is made of, for example, a stainless material that is not so high in heat dissipation. If a configuration is used in which a heat radiating plate made of, for example, an aluminum material, which is excellent in heat dissipation and spreads on the back surface side of the unit, is connected, it is possible to ensure both strength of the fixture and heat radiation of the light source.
[0018]
Also in this case, the heat sink is disposed so as to extend on the back side of the liquid crystal display unit, so that it does not hinder the visibility of the display surface and is small without increasing the planar size of the entire liquid crystal display unit. It does not hinder the conversion. Further, if the rear surface of the liquid crystal display unit is configured to be supported by the heat radiating plate, the heat radiating plate can also contribute to the improvement of the mechanical strength and the electromagnetic shielding effect of the liquid crystal display unit.
[0019]
The radiator plate may be separate from or integral with the fixture, but if it is configured integrally, air can be avoided at the connection between the radiator plate and the fixture, and the heat transfer efficiency from the fixture to the radiator plate And the heat can be efficiently released to the heat radiating plate having a higher heat radiating effect. Of course, even in the case of separate components, the heat conductivity from the fixture to the radiator plate may be increased by interposing the above-described heat conductive member between the radiator plate and the fixture.
[0020]
As a light source, a cathode fluorescent lamp such as a hot cathode fluorescent lamp or a cold cathode fluorescent lamp, a light emitting diode, an EL (Electro Luminescence) lamp, or the like can be used.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
(First Embodiment)
(Configuration of liquid crystal display device)
FIG. 2 shows a plan view of the liquid crystal display device 1 according to the present embodiment. The liquid crystal display device 1 includes a rectangular liquid crystal display unit 3, a pair of fixtures 6 respectively fixed to left and right side surfaces of the liquid crystal display unit 3, a lower end of the liquid crystal display unit 3 and a lower end of the fixture 6. And a heat conductive member 11 interposed between the first and second portions 8.
[0023]
FIG. 13 shows a sectional view of the liquid crystal display unit 3. The liquid crystal display unit 3 includes a liquid crystal panel 2, a light guide plate 45 disposed on the back surface (opposite to the display surface) side of the liquid crystal panel 2, a prism sheet 47 disposed between the liquid crystal panel 2 and the light guide plate 45, An optical sheet such as a diffusion sheet 46, a reflection sheet 44 disposed on the back surface of the light guide plate 45, a light source 5 disposed opposite the light incident end face 45b of the light guide plate 45, and a light source 5 are provided so as to cover the light source 5. And a reflector 43, which is housed in a case 4 (see FIG. 2) and configured as an integrated unit.
[0024]
The liquid crystal panel 2 includes two glass substrates on which transparent electrodes are vapor-deposited and in which liquid crystal molecules are sealed and bonded, a color filter, a polarizing filter, and the like.
[0025]
The light guide plate 45 is made of a transparent resin material having reflection dots 45a formed on the surface. One end surface (the left end surface in FIG. 13) of the light guide plate 45 is a light incident end surface 45b for receiving light from the light source 5, and the light source 5 is arranged to face the light incident end surface 45b.
[0026]
The light source 5 is, for example, a cold cathode fluorescent lamp extending in a direction along the lower end surface of the liquid crystal panel 2 as shown in FIG. The two electrode portions 5a at both ends of the light source 5 are drawn out of the liquid crystal display unit 3 by cables and connectors (not shown), and are connected to a battery built in the main body described later.
[0027]
Next, the fixture 6 will be described. FIG. 4 is a side view of the fixture 6 viewed from the inside facing the side surface of the liquid crystal display unit 3 in FIG. 2, and FIG.
[0028]
The attachment 6 has a U-shape when viewed from the front as shown in FIG. 2, and has a side plate portion 7 extending along the side surface of the liquid crystal display unit 3 and a side plate portion 7 extending from the side surface of the liquid crystal display unit 3. An upper end portion 9 and a lower end portion 8 bent in an L-shape from a protruding portion, and a plate-shaped facing portion 10 (see FIGS. 3 and 4) projecting vertically from the lower end portion 8 are integrally formed.
[0029]
As shown in FIGS. 3 and 4, for example, four screw holes 18 are formed in the side plate portion 7, and screws are passed through these screw holes 18 and fastened to the side surface of the liquid crystal display unit 3, so that the mounting fixture 6 is formed. It is fixed to the liquid crystal display unit 3. The pair of fixtures 6 are fixed to the left and right side surfaces of the liquid crystal display unit 3 so that the opposing portions 10 of the fixtures 6 face both ends of the lower end surface of the liquid crystal display unit 3 with a gap therebetween. You.
[0030]
A sheet-like heat conductive member 11 is interposed between both ends of the lower end surface of the liquid crystal display unit 3 and the facing portion 10 of the mounting fixture 6 facing the both ends. The heat conductive member 11 is made of a material having excellent heat conductivity and elasticity, such as silicon rubber or acrylic rubber, and is narrowed between the lower end surface of the liquid crystal display unit 3 and the facing portion 10 of the mounting member 6 so as to be compressed. Closely adhered to. Further, the heat conductive member 11 may be bonded to the lower end surface of the liquid crystal display unit 3 and the surface of the facing portion 10 of the fixture 6 using an adhesive having excellent heat conductivity.
[0031]
The lower end 8 of the attachment 6 is connected to a hinge composed of a hinge movable piece 12 and a hinge fixing piece 14. The hinge movable piece 12 is formed by integrally forming a rectangular plate-shaped mounting portion 12a and a columnar fitting portion 12b, and the lower end 8 of the mounting tool 6 is screwed into a screw hole 16 formed in the lower end 8. It is fixed to the mounting portion 12a of the hinge movable piece 12 via a threaded screw. The fitting portion 12b of the hinge movable piece 12 has a cylindrical shape and is rotatably fitted to a hinge fixing piece 14 fixed to the main body.
[0032]
Due to such a configuration, when the hinge movable piece 12 rotates with respect to the hinge fixing piece 14, the attachment 6 fixed to the hinge movable piece 12 and the liquid crystal display unit 3 fixed to the attachment 6 are formed. Together, they are pivoted forward and backward on the paper with the hinge fixing piece 14 as a fulcrum in FIG.
[0033]
(Operation of liquid crystal display device)
In FIG. 13, when power is supplied to the light source 5, light is emitted from the light source 5. Light emitted from the light source 5 is collected by the reflector 43 and enters the light incident end face 45b of the light guide plate 45. The light is uniformly reflected toward the liquid crystal panel 2 by a reflection dot 45a formed on the light guide plate 45 or a reflection sheet 44 disposed on the back surface of the light guide plate 45. The direction of the light emitted from the light guide plate 45 is changed by the diffusion sheet 46 and the prism sheet 47 so that the light enters the liquid crystal panel 2 perpendicularly.
[0034]
(Function of heat conduction member)
Light emission of the light source 5 involves heat generation. In particular, the amount of heat generated at the electrode portions 5a at both ends increases. In the present embodiment, the heat generated by the light source 5 can be released to the lower temperature fixture 6 via the heat conducting member 11. The heat transmitted to the facing portion 10 of the fixture 6 via the heat conducting member 11 is transmitted to the lower end portion 8 and the side plate portion 7 of the fixture 6 and diffused throughout the fixture 6 to be radiated. Since the heat conducting member 11 is in close contact with the lower end surface of the liquid crystal display unit 3 and the facing portion 10 of the fixture 6, the light source does not intervene in the heat transfer path from the liquid crystal display unit 3 to the fixture 6. 5 can be efficiently diffused to the fixture 6. As a result, it is possible to prevent failure or malfunction of each component, and further prevent unevenness in brightness of the liquid crystal panel 2 and the like.
[0035]
As a material of the attachment 6, for example, aluminum or copper which is excellent in heat dissipation is preferable. Further, since the attachment 6 functions as a frame member of the liquid crystal display unit 3 and is integrally rotated with the liquid crystal display unit 3, it is necessary to have strength enough to withstand this rotation operation. In particular, when the liquid crystal panel 2 is large, an Al-Mg-based material, an Al-Mg-Si-based material, an Al-Zn-Mg-based material having both heat dissipation and strength may be used.
[0036]
In addition, since the mounting fixture 6 is originally provided and functions as a heat radiator as it is, there is no increase in the planar dimensions of the liquid crystal display device 1 and no change in design. Accordingly, the existing liquid crystal display device can be easily improved by simply making a simple improvement (formation of the facing portion 10 to the fixture and disposition of the heat conducting member 11) without hindering the overall size of the liquid crystal display device 1. Thus, overheating of the light source 5 can be prevented.
[0037]
Further, since the heat conductive member 11 is made of silicon rubber or acrylic rubber and has elasticity, even if a shock is applied to the mounting member 6, the liquid crystal display unit 3 can be protected from shock by buffering the heat conductive member 11. .
[0038]
(Electronics)
Next, an embodiment of the electronic apparatus of the present invention to which the above-described liquid crystal display device 1 is applied will be described. FIG. 1 is a perspective view of a notebook computer as the electronic device 50, for example.
[0039]
The electronic device 50 is configured such that the liquid crystal display device 1 described above is rotatably attached to the main body 51 via a hinge (consisting of a hinge fixing piece 14 and a hinge movable piece 12). 1 is a state in which the liquid crystal display device 1 is opened with respect to the main body 51 and the display surface of the liquid crystal panel 2 is visible.
[0040]
The main body 51 has a keyboard 53, a touch pad 54, a jog dial 55, a power button 56, click buttons 57a, 57b, and the like on an upper surface, and includes a storage device such as a motherboard or a hard disk on which a CPU is mounted.
[0041]
The liquid crystal display device 1 is attached with the display surface of the liquid crystal panel 2 facing inward (facing toward the upper surface of the main body 51). The liquid crystal display device 1 is rotatable with respect to the main body 51 together with the lid-side housing 52 that houses the same. In the liquid crystal display device 1, for example, screws are passed through screw holes 15 formed in the upper end portion 9 of the mounting fixture 6 and screw holes 16 and 17 formed in the lower end portion 8 shown in FIG. It is fixed with screws.
[0042]
(Comparison of heat radiation effect between this embodiment and comparative example)
As a comparative example, a liquid crystal display device 75 shown in FIG. 12 was prepared, and a comparative experiment of a heat radiation effect with the liquid crystal display device 1 of the present embodiment described above was performed.
[0043]
The liquid crystal display device 75 shown in FIG. 12 does not form the facing portion 10 as in the present embodiment on the fixture 76, and further does not provide the heat conducting member 11. A gap is provided between the lower end of the liquid crystal display unit 3 where the light source 5 is disposed and the lower end 8 of the fixture 76. Other configurations are the same as those of the above-described liquid crystal display device 1 according to the present embodiment, and the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0044]
The liquid crystal display device 75 of this comparative example and the liquid crystal display device 1 of the present embodiment are operated at room temperature of 26 ° C. (the light source 5 is made to emit light). The temperature of the end face was measured. Below each of FIGS. 12 and 2, temperature measurement results at four points (indicated by ○) on the lower end surface of the liquid crystal display unit 3 are shown. The material of each part is the same in the comparative example and the present embodiment.
[0045]
As is clear from the results, in the present embodiment shown in FIG. 2, the measurement temperature is lower than that of the comparative example in the electrode portions 5a at both ends, which are the largest heat generating portions among the portions of the light source 5 (in the left end portion, It can be seen that the heat of the light source 5 can be efficiently released to the fixture 6 via the heat conducting member 11.
[0046]
(Second embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a plan view of the liquid crystal display device 31 according to the present embodiment. The liquid crystal display device 31 includes a rectangular liquid crystal display unit 3, a pair of fixtures 6 fixed to left and right side surfaces of the liquid crystal display unit 3, respectively, and a liquid crystal display unit 3 connected to the fixture 6 and provided on a back surface of the liquid crystal display unit 3. It is mainly composed of a spreading heat sink 20 and a heat conducting member 11 interposed between the lower end of the liquid crystal display unit 3 and the lower end 8 of the fixture 6.
[0047]
As in the first embodiment (FIG. 13), the liquid crystal display unit 3 includes a liquid crystal panel 2, a light guide plate 45 disposed on the back surface (opposite to the display surface) of the liquid crystal panel 2, and a liquid crystal panel 2. Optical sheets such as a prism sheet 47 and a diffusion sheet 46 disposed between the light guide plates 45, a reflection sheet 44 disposed on the back surface of the light guide plate 45, and a light incident end surface 45 b of the light guide plate 45. And a reflector 43 provided so as to cover the light source 5. These are housed in the case 4 and configured as an integrated unit.
[0048]
The light guide plate 45 is made of a transparent resin material having reflection dots 45a formed on the surface. One end surface (the left end surface in FIG. 13) of the light guide plate 45 is a light incident end surface 45b for receiving light from the light source 5, and the light source 5 is arranged to face the light incident end surface 45b.
[0049]
The light source 5 is, for example, a cold cathode fluorescent lamp extending in a direction along the lower end surface of the liquid crystal panel 2 as shown in FIG. The two electrode portions 5a at both ends of the light source 5 are drawn out of the liquid crystal display unit 3 by cables and connectors (not shown), and are connected to a battery built in the main body described later.
[0050]
The attachment 6 is also configured in the same manner as in the first embodiment. That is, the mounting fixture 6 has a U-shape when viewed from the front as shown in FIG. 5, and has a side plate portion 7 extending along the side surface of the liquid crystal display unit 3, and a side surface of the liquid crystal display unit 3 at the side plate portion 7. An upper end 9 and a lower end 8 bent in an L-shape from a portion extending from the lower end, and a plate-shaped facing portion 10 (see FIGS. 6 and 7) projecting vertically from the lower end 8 are integrally formed. Become.
[0051]
As shown in FIGS. 6 and 7, for example, four screw holes 18 are formed in the side plate portion 7, and screws are passed through these screw holes 18 and fastened to the side surface of the liquid crystal display unit 3, so that the mounting fixture 6 is formed. It is fixed to the liquid crystal display unit 3. The pair of fixtures 6 are fixed to the left and right side surfaces of the liquid crystal display unit 3 so that the opposing portions 10 of the fixtures 6 face both ends of the lower end surface of the liquid crystal display unit 3 with a gap therebetween. You.
[0052]
Further, a sheet-like heat conductive member 11 is interposed between both ends of the lower end surface of the liquid crystal display unit 3 and the facing portion 10 of the mounting fixture 6 facing the both ends. The heat conductive member 11 is made of a material having excellent heat conductivity and elasticity, such as silicon rubber or acrylic rubber, and is narrowed between the lower end surface of the liquid crystal display unit 3 and the facing portion 10 of the mounting member 6 so as to be compressed. Closely adhered to. Further, the heat conductive member 11 may be bonded to the lower end surface of the liquid crystal display unit 3 and the surface of the facing portion 10 of the fixture 6 using an adhesive having excellent heat conductivity.
[0053]
The lower end 8 of the attachment 6 is connected to a hinge composed of a hinge movable piece 12 and a hinge fixing piece 14. The hinge movable piece 12 is formed by integrally forming a rectangular plate-shaped mounting portion 12a and a columnar fitting portion 12b, and the lower end 8 of the mounting tool 6 is screwed into a screw hole 16 formed in the lower end 8. It is fixed to the mounting portion 12a of the hinge movable piece 12 via a threaded screw. The fitting portion 12b of the hinge movable piece 12 has a cylindrical shape and is rotatably fitted to a hinge fixing piece 14 fixed to the main body.
[0054]
Further, in the present embodiment, the heat sink 20 is connected to the attachment 6. The radiator plate 20 has a flat plate portion 21 and a mounting portion 22 bent in an L-shape. As shown in FIG. 6, two screw holes 23 are formed in the mounting portion 22, and these screw holes 23 are formed in two of the screw holes 18 formed in the side plate portion 7 of the mounting tool 6 near the lower end portion 8. The two screw holes 18 are aligned and fastened together to the side surface of the liquid crystal display unit 3.
[0055]
The flat plate portion 21 of the heat radiating plate 20 extends to the rear surface side of the liquid crystal display unit 3 in a region near the electrode portion 5a of the light source 5.
[0056]
Also in the present embodiment, similarly to the first embodiment, the heat generated by the light source 5 can be released to the lower temperature fixture 6 via the heat conducting member 11. The heat transmitted to the facing portion 10 of the fixture 6 via the heat conducting member 11 is transmitted to the lower end portion 8 and the side plate portion 7 of the fixture 6 and diffused throughout the fixture 6, and further diffused to the heat sink 20. The heat is diffused to the flat plate portion 21 through the mounting portion 22 and is radiated.
[0057]
For this reason, even if, for example, a stainless steel material that does not have good heat dissipation is used in order to impart strength to the fixture 6, the material of the heat sink 20 is made of aluminum or copper excellent in heat dissipation, so that the fixture 6 It is possible to ensure both the strength and the heat radiation of the light source 5. Of course, if both the attachment 6 and the heat radiating plate 20 are made of aluminum or copper, a greater heat radiating effect can be obtained.
[0058]
Also in the present embodiment, the liquid crystal display device 31 according to the present embodiment is operated at a room temperature of 26 ° C. (the light source 5 emits light), and the temperature of the lower end surface of the liquid crystal display unit 3 is measured one hour after the operation starts. did. The lower part of FIG. 5 shows the temperature measurement results at four points (indicated by ○) on the lower end surface of the liquid crystal display unit 3. Note that the materials of the attachment 6, the radiator plate 20 of the second embodiment, and the same material (for example, aluminum) in the comparative example, the first embodiment, and the second embodiment are all the same. .
[0059]
As is clear from this result, in the present embodiment, the measurement temperature is lower than that of the comparative example in the electrode portions 5a at both ends, which are the largest heat-generating portions among the portions of the light source 5 (3 ° C. lower at the left end, The temperature at the right end is as low as 12 ° C.), which is lower than that in the first embodiment. The heat of the light source 5 is efficiently released to the fixture 6 and the heat radiating plate 20 via the heat conducting member 11, and It can be seen that the temperature rise can be suppressed.
[0060]
The plane size of the flat plate portion 21 of the heat radiating plate 20 is determined in consideration of both the heat radiation and the weight of the liquid crystal display device 31. Naturally, the heat dissipation can be improved as the plane size of the flat plate portion 21 is increased. When the flat plate portion 21 is made of metal and its plane dimension is increased, the liquid crystal display unit 3 is protected from external noise, or an electromagnetic shield that suppresses emission of noise from the liquid crystal display unit 3 to the outside. The effect can be enhanced. Furthermore, if the flat plate portion 21 is supported by being in contact with the back surface of the liquid crystal display unit 3, the mechanical strength of the liquid crystal display unit 3 can be improved by suppressing the bending of the liquid crystal display unit 3 and the like.
[0061]
(Third embodiment)
Next, a third embodiment of the present invention will be described. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0062]
In this embodiment, the fixture 25 and the radiator plate 26 shown in FIGS. 8 to 10 are used instead of the fixture 6 and the radiator plate 20 in the second embodiment. That is, the fixture 25 and the heat radiating plate 26 are integrally formed, not connected by screws.
[0063]
With such a configuration, it is possible to avoid air from intervening at the connection point between the fixture 25 and the radiator plate 26, and to efficiently radiate heat from the light source 5 transmitted to the fixture 25 via the heat conducting member 11. It can escape to the plate 26. For example, it is preferable that the fixture 25 and the heat radiating plate 26 are integrally formed from an Al-Mg-based material, an Al-Mg-Si-based material, an Al-Zn-Mg-based material having both heat dissipation and strength. Of course, for example, in the case of a small liquid crystal display unit 3, the mounting fixture 25 and the heat radiating plate 26 may be made of aluminum alone.
[0064]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0065]
In the present embodiment, a plurality of light emitting diodes 30 are used as a light source. Each light emitting diode 30 is intermittently arranged along the extending direction of the light incident end face 45b, facing the light incident end face 45b of the light guide plate 45 shown in FIG.
[0066]
In the present embodiment, the attachments 36 fixed to the left and right side surfaces of the liquid crystal display unit 3 are connected to each other by the facing portion 41. That is, the facing portion 41 extends laterally from the lower end portion 8 of the attachment 36 and extends along the lower end surface of the liquid crystal display unit 3. A heat conductive member 40 is interposed between the facing portion 41 and the lower end surface of the liquid crystal display unit 3 in close contact with both. Therefore, the heat conducting member 40 exists over the entire length of the lower end surface of the liquid crystal display unit 3. Thereby, the heat generated from each light emitting diode 30 can be released to the fixture 36 without bias. Note that the heat conductive member 40 may be provided intermittently in accordance with the location of each light emitting diode 30.
[0067]
Of course, the fourth embodiment can be applied to a case where a fluorescent lamp as in the first embodiment is used as a light source. In this case, it is possible to suppress a rise in temperature at locations other than the electrode portions 5a at both ends.
[0068]
Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these, and various modifications can be made based on the technical idea of the present invention.
[0069]
The arrangement position of the light sources 5, 30 is not limited to the lower end of the liquid crystal display unit 3, but may be the upper end or the side. In this case, the interposition position of the heat conducting member is changed accordingly. For example, when the light sources 5 and 30 are arranged on the upper end side of the liquid crystal display unit 3, an opposing portion is formed on the upper end portion 9 of the fixture 6, and between the opposing portion and the upper end portion of the liquid crystal display unit 3. A heat conduction member is interposed between the two. Alternatively, when the light sources 5 and 30 are arranged on the side surface of the liquid crystal display unit 3, the surface of the side plate portion 7 of the fixture 6 facing the side surface of the liquid crystal display unit 3 functions as an opposing portion, and heat is applied between the two. A conductive member is interposed.
[0070]
For example, in the case of a small liquid crystal display unit applied to a mobile phone or the like, only one of the attachments 6 may be used.
[0071]
The electronic device is not limited to a notebook computer, but may be a PDA (Personal Digital Assistants), a mobile phone, a stationary phone with a liquid crystal display device, a car navigation device, or the like.
[0072]
【The invention's effect】
As described above, according to the present invention, a mounting portion for connecting a liquid crystal display unit to a hinge is provided with a facing portion facing the end of the liquid crystal display unit where the light source is disposed, and the facing portion and the liquid crystal are formed. Since the heat conductive member is closely interposed between the display unit and the end of the display unit, the heat generated from the light source can be efficiently released to the fixture through the heat conductive member, and the overheating of the light source can be prevented. As a result, the reliability of components near the light source can be improved, and unevenness in brightness of the liquid crystal panel can be suppressed.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electronic device according to an embodiment of the present invention.
FIG. 2 is a front view of the liquid crystal display device according to the first embodiment of the present invention.
FIG. 3 is a side view of the fixture shown in FIG. 2;
FIG. 4 is a side view of the fixture as viewed from the side opposite to FIG. 3;
FIG. 5 is a front view of a liquid crystal display device according to a second embodiment.
FIG. 6 is a side view of the fixture shown in FIG. 5;
FIG. 7 is a side view of the fixture as viewed from the side opposite to FIG. 6;
FIG. 8 is a front view of a fixture according to a third embodiment.
FIG. 9 is a side view of the fixture shown in FIG. 8;
FIG. 10 is a side view of the fixture seen from the opposite side to FIG. 9;
FIG. 11 is a front view of a liquid crystal display device according to a fourth embodiment.
FIG. 12 is a front view of a conventional liquid crystal display device.
FIG. 13 is a sectional view of the liquid crystal display unit according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Liquid crystal panel, 3 ... Liquid crystal display unit, 4 ... Case, 5 ... Light source, 5a ... Electrode part, 6 ... Fixture, 10 ... Opposite part, 11 ... Heat conductive member, 12 ... Hinge movable Piece, 14: hinge fixing piece, 20: radiator plate, 25: mounting member, 26: radiator plate, 30: light source, 31: liquid crystal display device, 36: mounting member, 40: heat conductive member, 41: facing portion, 45 ... light guide plate, 45b ... light incident end face, 50 ... electronic equipment, 51 ... main body.

Claims (6)

A liquid crystal panel, a light guide plate disposed on the back side of the liquid crystal panel, and a liquid crystal display unit having a light source disposed on a light incident end face of the light guide plate;
A liquid crystal display device, comprising: a fixture fixed to a side surface of the liquid crystal display unit and having one end extending from the side surface connected to a hinge.
The fixture has a facing portion facing the end of the liquid crystal display unit where the light source is disposed, and a heat conductive member is interposed between the facing portion and the end of the liquid crystal display unit. A liquid crystal display device characterized by the above-mentioned. 2. The liquid crystal display device according to claim 1, wherein a heat radiating plate extending on a rear surface side of the liquid crystal display unit is connected to the attachment. 3. The liquid crystal display device according to claim 2, wherein the heat sink is integrally connected to the attachment. An electronic device in which a liquid crystal display device is rotatably attached to a main body via a hinge,
The liquid crystal display device,
A liquid crystal panel, a light guide plate disposed on the back side of the liquid crystal panel, and a liquid crystal display unit having a light source disposed on a light incident end face of the light guide plate;
A fixture fixed to the side surface of the liquid crystal display unit and having one end extending from the side surface connected to a hinge,
The fixture has a facing portion facing the end of the liquid crystal display unit where the light source is disposed, and a heat conductive member is provided between the facing portion and the end of the liquid crystal display unit. Electronic equipment characterized by being closely interposed. The electronic device according to claim 4, wherein a heat radiating plate extending on a back surface side of the liquid crystal display unit is connected to the attachment. The electronic device according to claim 5, wherein the heat sink is integrally connected to the fixture.

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