JP3861536B2 - Display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device, and more particularly to a display device having a function of realizing a good display state by suppressing a temperature rise inside the device.
[0002]
[Background]
As a display device having a light source device and a light modulation device that modulates a light beam emitted from the light source device, a display device including a liquid crystal panel is known. In such a display device, a backlight is disposed as a light source device on the back surface of the liquid crystal panel, and the light emitted from the backlight is modulated by the liquid crystal panel to display an image or the like. It is used as a device, an image display device of a portable or wall-mounted television, a viewfinder of a video camera, and the like.
[0003]
[Problems to be solved by the invention]
By the way, since the fluorescent tube constituting the light source device such as the backlight generates heat, it is necessary to release the heat to the outside of the device in order to suppress the deterioration of the display performance due to the temperature rise inside the display device. In the fluorescent tube terminal part that applies high voltage to the tube, if a heat sink such as metal is arranged in the terminal part and the heat is guided to the outside of the device, the applied voltage will be affected, and the spark will be affected. Such a structure cannot be taken because of the high risk of such problems, and adverse effects on product functions and handling are expected. For this reason, the metal portion must be provided away from the terminal portion, so that a sufficient heat dissipation effect cannot be expected, and there is a problem that the space is required and the device cannot be sufficiently downsized.
[0004]
An object of the present invention is to provide a display device that can improve the cooling efficiency of the terminal portion of the light source unit and promote downsizing.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a display device according to the present invention includes a light source device including a light source, a terminal portion that applies a voltage to the light source, and a light modulation device that modulates an emitted light beam from the light source device. A display device having an exterior case that covers the light source device and at least a part of the light modulation device, and the exterior case emits radiant heat radiated from the light source or the terminal portion to the outside of the exterior case. The heat dissipating means is provided.
[0006]
According to the present invention, since the radiant heat radiated from the terminal portion to which a high voltage is applied is released to the outside of the outer case by the heat radiating means, the terminal portion is efficiently cooled, and the temperature inside the apparatus is increased. The rise can be suppressed. Therefore, it is possible to suppress deterioration in display performance due to a temperature rise inside the display device.
[0007]
In the present invention, the outer case is made of a metal material or a plastic material that does not transmit radiant heat, and the heat radiating means is formed as a notch formed in the outer case according to the arrangement of the terminal portion. preferable. The exterior case includes a first case made of metal and a second case made of plastic, and the heat radiating means is configured as a notch formed in the first case according to the arrangement of the terminal portion. It may be.
[0008]
According to the present invention as described above, the radiant heat radiated from the terminal portion is radiated to the outside of the apparatus from the notch, so that the temperature rise inside the apparatus can be suppressed with a simple structure. In addition, the distance between the terminal portion and the outer case can be shortened, and further downsizing of the display device can be promoted.
[0009]
Here, the notch part should just respond | correspond to arrangement | positioning of a terminal part, for example, may be a notch part corresponding to each terminal part, and may be one big notch part which can respond | correspond to two terminal parts. Good.
[0010]
In this invention, it is preferable that the notch part is provided with the heat radiating member which covers a notch part and permeate | transmits radiant heat, and it is more preferable that this heat radiating member is formed with the transparent material.
[0011]
According to the present invention, since the notch is covered with the heat radiating member, intrusion of foreign matter from the outside can be prevented in addition to the heat radiating effect.
[0012]
Here, transparency is a concept including translucency. Further, the shape of the heat radiating member and the attachment to the outer case are not limited as long as the cutout portion is closed. For example, what fits into a notch part, what covers a notch part from the outside, etc. are mentioned.
[0013]
In this invention, it is preferable that the heat radiating member has insulation.
[0014]
According to the present invention as described above, since the notch is covered with the insulator, it is possible to prevent external static electricity from entering, thereby preventing deterioration of display performance and damage to the apparatus. Further, since the heat radiating member has insulating properties, the heat radiating member can be disposed close to the terminal portion, and further miniaturization of the display device can be promoted.
[0015]
In the present invention, the heat radiating member is preferably made of plastic.
[0016]
According to the present invention, it is possible to improve the radiant heat permeability.
[0017]
In this invention, it is preferable that the heat radiating member is integrated with the 2nd plastic case.
[0018]
According to the present invention, the heat radiating member can be integrally formed with the second case as a part of the second case, so that the number of members can be reduced. Moreover, since the heat radiating member covers the notch at the same time as assembling the second case and the first case, the assembly becomes easy.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
(1) Configuration of Display Device As shown in FIG. 1, the display device 11 is displayed on the liquid crystal panel 30 serving as a display unit, the backlight device 40 serving as a back light source device for the liquid crystal panel 30, and the liquid crystal panel 30. A display control board 50 that controls images and the like, and an exterior case 60 including a front case 61 and a back case 62 that house and integrate them.
[0021]
The liquid crystal panel 30 is disposed on the back surface of the liquid crystal display panel 31, a liquid crystal display panel 31 as a light modulation device that modulates the light flux emitted from the light source, a panel shield frame 32 that covers the outer periphery of the liquid crystal display panel 31, and the liquid crystal display panel 31. A diffusing plate 33 is provided.
[0022]
The liquid crystal display panel 31 includes a pair of substrates made of glass and the like, and liquid crystal sealed between the substrates via a seal member.
[0023]
The panel shield frame 32 is for preventing the influence of EMI (electromagnetic interference) or the like on the liquid crystal display panel 31. The panel shield frame 32 is formed in a frame shape by bending or punching a metal plate, and has a liquid crystal inside. The display panel 31 has an opening 32A that exposes the display surface. The panel shield frame 32 is sandwiched between the liquid crystal display panel 31 and a front case 61 constituting the exterior case 60, and is incorporated in contact with these.
[0024]
The diffusion plate 33 diffuses the light beam from the backlight device 40 and irradiates the liquid crystal display panel 31, that is, converts the light beam emitted from the line light source of the backlight device 40 into a substantially uniform surface light source. It is formed in the rectangular plate shape corresponding to the display surface shape of the liquid crystal display panel 31 with the milky-white plastic material which added.
[0025]
The backlight device 40 includes a backlight main body 45 and a heat conducting plate 46. The backlight main body 45 is installed on the back surface of the fluorescent tube 41 and the fluorescent tube 41 as a light emitting means bent in a W shape so as to straddle substantially the entire back surface of the liquid crystal display panel 31. The reflecting plate 42 that reflects the light radiated to the opposite side to the liquid crystal display panel 31 toward the liquid crystal display panel 31, the terminal portion 41A that applies voltage to the fluorescent tube 41, and the backlight substrate 43 that supplies power to the terminal portion 41A. And.
[0026]
The heat conducting plate 46 is formed by bending a metal plate having high thermal conductivity, for example, a metal plate such as copper or aluminum. Specifically, a rectangular heat transfer portion 46A that is in close contact with the back surface of the reflecting plate 42 and a contact portion 46C connected to the heat transfer portion 46A via a bent portion 46B are provided. The contact portion 46C is in contact with the inner surface of the side piece 61B of the front case 61. Thereby, the reflecting plate 42 and the front case 61 are connected, and a heat conduction path 65 that transmits heat from the backlight device 40 to the front case 61 is formed.
[0027]
The exterior case 60 includes a metal front case 61 (first case) and a plastic back case 62 (second case), and the front case 61 is formed in a frame shape by bending a metal plate, An opening 61A that exposes the display surface of the liquid crystal display panel 31 is formed.
[0028]
The back case 62 is formed in a box shape by injection molding of transparent plastic, and is fitted and attached to the outside of the front case 61.
[0029]
As shown in FIG. 2, the display control board 50 is configured by mounting various circuit elements (circuit parts) on the board body 51, and controls an image displayed on the liquid crystal panel 30.
[0030]
As shown in FIGS. 1 and 3, in such a display device 11, heat radiating means 66 for radiating radiant heat radiated from the terminal portion 41 </ b> A to the outside of the device is provided on one side of the front case 61 and the back case 62. It has been. The heat radiating means 66 includes two notches 61C and 61C formed in the front case 61, and is provided at a position corresponding to the terminal portion 41A of the backlight device 40. The notch 61C is formed with lids 62A and 62A (heat dissipating members) that block the two notches 61C and 61C. The lid 62A transmits the radiant heat from the terminal portion 41A and is insulative. And is formed integrally with the back case 62.
[0031]
By configuring the heat radiating means 66 as described above, the radiant heat radiated from the heat radiating terminal portion 41 </ b> A toward the notch 61 </ b> C is released to the outside of the outer case 60 without being blocked by the metal front case 61. Is done. Further, since the lid 62A that closes the notch 61C is made of transparent plastic, the radiant heat emitted from the notch 61C is transmitted by the lid 62A without being blocked by the lid 62A. Released to the outside.
[0032]
The notches 61C and 61C and the lids 62A and 62A and the terminal portion 41A are close to each other so as not to interfere with each other, and the front case 61 and the back case 62 are formed so that the dimensions in the approaching direction are shortened. Has been.
[0033]
(2) Effects of the embodiment According to the above embodiment, the following effects are obtained.
[0034]
(1) Since the radiant heat radiated from the terminal portion 41A to which a high voltage is applied is released from the cutout portions 61C and 61C constituting the heat radiation means 66 to the outside of the outer case 60, the terminal portion 41A is efficiently It is cooled and the temperature rise inside the apparatus can be suppressed. Therefore, it is possible to suppress deterioration in display performance due to a temperature rise inside the display device 11. Further, the heat radiation means 66 can be configured with a simple structure. Furthermore, the distance between the terminal portion 41A and the outer case 60 can be shortened, and the downsizing of the display device 11 can be promoted.
[0035]
(2) The notch 61C is covered with a lid 62A (heat dissipating member) made of transparent plastic that transmits radiant heat, so that foreign matter can be prevented from entering without impairing the heat dissipating effect. it can.
[0036]
(3) Since the lid 62A covering the notch 61A has an insulating property, it is possible to prevent the static electricity from jumping into the display device 11 from the notch 61A, and the display performance is deteriorated or the device is damaged by the static electricity. Can be prevented.
[0037]
(4) Since the lid 62A has an insulating property, the lid 62A can be disposed in the vicinity of the terminal portion 41A, and the display device 11 can be further reduced in size.
[0038]
(5) The lid 62A is formed integrally with the back case 62 and can be manufactured at the same time as the back case 62 is manufactured. Therefore, it is possible to reduce the number of manufacturing steps and the number of members. it can. In addition, since the back case 62 and the front case 61 are assembled, the lid 62A covers the notch 61C, so that the assembly becomes easy.
[0039]
(6) The back case 62 is made of transparent plastic. However, by integrating the lid 62A with the back case 62, in addition to the radiant heat from the backlight device 40, the display control board 50, etc. Since the radiant heat radiated from the heat generating part incorporated in the inside of the display 11 can also be released to the outside, the temperature rise inside the display device 11 can be further suppressed.
[0040]
(3) Modifications of Embodiments The present invention is not limited to the above-described embodiments, and includes modifications as described below.
[0041]
In the embodiment, the notches 61C and 61C of the front case 61 constituting the heat radiating means 66 are provided on substantially the extension line of the terminal portion 41A, but this is not restrictive. It is good also as one notch part of the shape which tied two notch parts 61C and 61C. Even in this case, the same effect as described above can be obtained.
[0042]
Moreover, in the said embodiment, although the exterior case 60 was comprised as 2 body structure which consists of the front case 61 and the back case 62, it is not restricted to this, It is good also as an integral structure exterior case. In this case, the outer case is made of a metal material or a plastic material that does not transmit radiant heat, and if the cutout portion is formed in the outer case according to the arrangement of the terminal portion, the same effect as described above can be obtained. it can.
[0043]
In the embodiment, the lid 62A as the heat radiating member is integrally formed with the back case 62 made of transparent plastic, but is not limited thereto, and is formed as a separate body from the back case 62. It may be attached to the back case 62 or the front case 61. Further, the lid 62A as the heat radiating member may be made of glass, and any material can be adopted as long as it can transmit radiant heat.
[0044]
Moreover, in the said embodiment, although the fluorescent tube 41 used for the backlight apparatus 40 was a W-shaped thing, even if it uses fluorescent tubes of all shapes, such as U shape and a straight tube, this invention is applied. can do.
[0045]
Further, in the above embodiment, the liquid crystal panel 30 includes the liquid crystal display panel 31, the panel shield frame 32, and the diffusion plate 33 that are separately formed. However, the present invention is not limited to this, and a liquid crystal display panel or the like is incorporated in advance. You may use what was unitized by.
[0046]
Moreover, in the said embodiment, although the backlight apparatus 40 was comprised by the backlight main body 45 and the heat-conducting plate 46, it is not restricted to this, Using both 45 and 46 is integrated and unitized is used. Also good.
[0047]
Furthermore, in the above-described embodiment, the backlight device 40 as a back light source of the liquid crystal panel 30 uses a so-called direct type backlight, but is not limited thereto. That is, a so-called edge-type (side-type) backlight may be used as the back light source. In this case, the light beam emitted from the fluorescent tube disposed on the back side of the liquid crystal panel and on the side of the liquid crystal panel is guided and diffused by a light guide plate or the like disposed on the back side of the liquid crystal panel. Irradiated to the back.
[0048]
In addition, the specific structure, shape, and the like when carrying out the present invention may be other structures as long as the object of the present invention can be achieved.
[0049]
【The invention's effect】
According to the display device as described above, since the radiant heat radiated from the terminal portion to which a high voltage is applied is radiated to the outside of the device by the heat radiating means, the terminal portion is efficiently cooled. Therefore, a temperature rise inside the apparatus can be suppressed, and display performance deterioration due to the internal temperature rise can be suppressed. In addition, the terminal portion and the outer case can be brought close to each other, and thus the display device can be reduced in size.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a structure of a display device according to an embodiment of the present invention.
FIG. 2 is a perspective view for explaining the structure of a display control board in the embodiment.
FIG. 3 is an overall perspective view showing the display device in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Display apparatus 30 Liquid crystal panel 40 as a light modulation apparatus Backlight apparatus 41 as a light source device Fluorescent tube (light source)
41A Terminal portion 50 Display control board 60 Exterior case 61 Front case (first case)
61C Notch 62 constituting heat dissipating means Back case (second case)
62A Lid (heat dissipation member)

Claims (5)

A display device comprising a light source and a light source device comprising a terminal portion for applying a voltage to the light source, and a light modulation device for modulating an emitted light beam from the light source device,
An exterior case that covers the light source device and at least a part of the light modulation device;
The outer case is made of a metal material or a plastic material that does not transmit the radiant heat,
The outer case is provided with a heat radiating means for releasing radiant heat radiated from the light source or the terminal portion to the outside of the outer case,
The heat dissipation means is configured as a notch formed in the outer case according to the arrangement of the terminal portion,
The display device, wherein the notch portion is provided with a heat radiating member that is formed of a transparent material that covers the notch portion and transmits the radiant heat. A display device comprising a light source and a light source device comprising a terminal portion for applying a voltage to the light source, and a light modulation device for modulating an emitted light beam from the light source device,
An exterior case that covers the light source device and at least a part of the light modulation device;
The exterior case includes a first case made of metal and a second case made of plastic,
The outer case is provided with a heat radiating means for releasing radiant heat radiated from the light source or the terminal portion to the outside of the outer case,
The heat dissipation means is configured as a notch formed in the first case according to the arrangement of the terminal portion,
The display device, wherein the notch portion is provided with a heat radiating member that is formed of a transparent material that covers the notch portion and transmits the radiant heat. The display device according to claim 1 or 2,
The display device, wherein the heat radiating member has an insulating property. The display device according to any one of claims 1 to 3,
The display device, wherein the heat radiating member is made of plastic. The display device according to claim 2,
The display device, wherein the heat dissipation member is integrated with the second case.

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