JP2001154593A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can improve the cooling efficiency in the terminal portions of a light source section and can promote downsizing. SOLUTION: This display device 11 has the light source device 40 having the light source and the terminal portions for impressing voltage to the light source, an optical modulator 31 for modulating the exit luminous flux from the light source device 40 and an exterior case 60 covering the light source device 40 and at least part of the optical modulator 31 and the exterior case 60 is provided with a radiating means 61 for releasing the radiation heat radiated from the light source, etc., to the outside of the exterior case 6. The radiation heat radiated from the terminal portions is released to the outside of the exterior case by the radiating means and therefore the terminal portions are efficiently cooled and the temperature elevation inside the device may be suppressed and the deterioration, etc., of the display performance by the temperature elevation in the display device may be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device,
More specifically, the present invention relates to a display device having a function of suppressing a rise in temperature inside the device and realizing a favorable display state.

[0002]

2. Description of the Related Art A display device having a liquid crystal panel is known as a display device having a light source device and a light modulation device for modulating a light beam emitted from the light source device. In such a display device, a backlight is arranged as a light source device on the back of a liquid crystal panel or the like, and 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]

The fluorescent tubes constituting a light source device such as a backlight generate heat. Therefore, in order to suppress the deterioration of display performance due to a rise in temperature inside the display device, the heat is transferred to the outside of the device. You need to escape, but especially
In the fluorescent tube terminal part which applies a high voltage to the fluorescent tube, if a heat sink made of metal or the like is arranged in the terminal part and the heat is conducted there to release the heat to the outside of the device, the applied voltage is affected, Such a structure cannot be adopted because there is a high risk of sparks and the like, and adverse effects on product functions and handling are expected. For this reason, since the metal portion must be provided separately from the terminal portion, a sufficient heat radiation effect cannot be expected, and furthermore, there is a problem that the space is required and the size of the device cannot be sufficiently reduced.

An object of the present invention is to provide a display device capable of improving the cooling efficiency of a terminal portion of a light source section and promoting downsizing.

[0005]

In order to achieve the above-mentioned object, a display device according to the present invention comprises a light source device having a light source, a terminal portion for applying a voltage to the light source, and a light source device. A display device having a light modulator that modulates an emitted light beam, the display device having an outer case that covers a light source device and at least a part of the light modulator, and the outer case is radiated from a light source or a terminal portion. A radiating means for radiating radiant heat to the outside of the outer case is provided.

According to the present invention, the radiant heat radiated from the terminal portion to which a high voltage is applied is radiated to the outside of the outer case by the heat radiating means. Internal temperature rise can be suppressed. Therefore, it is possible to suppress deterioration of display performance due to a rise in temperature inside the display device.

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 cutout formed in the outer case in accordance with the arrangement of the terminal portion. Is preferred. The exterior case is configured to include a first case made of metal and a second case made of plastic, and the heat radiation means is configured as a cutout formed in the first case in accordance with the arrangement of the terminal portion. May be.

According to the present invention, since the radiant heat radiated from the terminal portion is radiated from the notch to the outside of the device, the temperature rise inside the device can be suppressed with a simple structure. Further, the distance between the terminal portion and the outer case can be shortened, and the size of the display device can be further reduced.

Here, the notch portion may be in accordance with the arrangement of the terminal portions, for example, a notch portion corresponding to each terminal portion, or a large one notch portion corresponding to two terminal portions. It may be a notch.

In the present invention, it is preferable that the notch is provided with a heat radiating member which covers the notch and transmits radiant heat, and it is more preferable that the heat radiating member is formed of a transparent material. .

According to the present invention, since the notch is covered with the heat radiating member, it is possible to prevent foreign substances from entering from outside in addition to the above-described heat radiating effect.

Here, transparency is a concept including translucency. Further, the shape of the heat radiating member and the attachment to the exterior case are not limited as long as they cover the notch. For example, an object that fits into the notch portion, an object that covers the notch portion from the outside, and the like can be given.

In the present invention, the heat radiating member preferably has an insulating property.

According to the present invention, since the notch is covered with the insulator, it is possible to prevent static electricity from entering from outside, thereby preventing deterioration of display performance and damage to the device. Further, since the heat radiating member has an insulating property, the heat radiating member can be arranged close to the terminal portion, and the size of the display device can be further reduced.

In the present invention, the heat radiating member is preferably formed of plastic.

According to the present invention, it is possible to improve the radiation heat transmission.

In the present invention, it is preferable that the heat radiation member is integrated with the second case made of plastic.

According to the present invention, since the heat radiation member can be formed integrally with the second case as a part of the second case, the number of members can be reduced.
In addition, since the heat radiating member covers the notch at the same time when the second case and the first case are assembled, the assembly becomes easy.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(1) Configuration of Display Device As shown in FIG. 1, the display device 11 includes a liquid crystal panel 30 serving as a display unit, a backlight device 40 serving as a back light source device of the liquid crystal panel 30, and a liquid crystal panel 30. A display control board 50 for controlling the images and the like displayed on the display case, and an outer case 60 composed of a front case 61 and a back case 62 that house and integrate them are configured.

The liquid crystal panel 30 includes a liquid crystal display panel 31 as a light modulator for modulating a light beam emitted from a light source, a panel shield frame 32 covering an outer peripheral portion of the liquid crystal display panel 31, and a liquid crystal display panel And a diffusion plate 33 arranged.

The liquid crystal display panel 31 is composed of a pair of substrates made of glass or the like and liquid crystal sealed between the substrates via a sealing member.

The panel shield frame 32 is for preventing the influence of EMI (electromagnetic interference) on the liquid crystal display panel 31 and is formed in a frame shape by bending or punching a metal plate. An opening 32A for exposing the display surface of the liquid crystal display panel 31 is provided inside. The panel shield frame 32 is sandwiched between the liquid crystal display panel 31 and the front case 61 constituting the outer case 60 and is incorporated in a state of being in contact therewith.

The diffusion plate 33 diffuses the light beam from the backlight device 40 and irradiates the liquid crystal display panel 31 with the light beam.
The light emitted from the linear light source of the backlight device 40 is converted into a substantially uniform surface light source. The light beam is formed into a rectangular plate shape corresponding to the display surface shape of the liquid crystal display panel 31 from a milky white plastic material to which a diffusing agent is added. ing.

The backlight device 40 includes a backlight body 45 and a heat conducting plate 46. The backlight body 45 includes a fluorescent tube 4 serving as a light emitting unit bent in a W shape so as to extend over substantially the entire back surface of the liquid crystal display panel 31.
A reflector 42 disposed on the back of the fluorescent tube 41 to reflect light emitted from the fluorescent tube 41 to the opposite side of the liquid crystal display panel 31 and directing the light toward the liquid crystal display panel 31; And a backlight substrate 43 for supplying power to the terminal portion 41A.

The heat conducting plate 46 is formed by bending a metal plate having a high thermal conductivity, for example, a metal plate such as copper or aluminum. Specifically, a rectangular heat transfer portion 46A closely attached to the back surface of the reflection plate 42, and the heat transfer portion 46A
And a contact portion 46C connected via a bent portion 46B. The contact portion 46C is a side piece 61B of the front case 61.
It is in contact with the inner surface. As a result, the reflection 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.

The outer case 60 includes a metal front case 61.
(First case) and a plastic back case 62
The front case 61 is formed in a frame shape by bending a metal plate, and an opening 61A for exposing the display surface of the liquid crystal display panel 31 is formed therein.

The back case 62 is formed in a box shape by injection molding of a transparent plastic, and fitted and attached to the outside of the front case 61.

The display control board 50 is, as shown in FIG.
It is configured by mounting various circuit elements (circuit components) on the substrate main body 51 and controls images and the like displayed on the liquid crystal panel 30.

As shown in FIGS. 1 and 3, in such a display device 11, one of the front case 61 and the back case 62
On the side surface, a heat radiating means 66 for radiating heat radiated from the terminal portion 41A to the outside of the device is provided. The heat radiating means 66 includes two notches 61C, 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 includes two notches 61.
Covers 62A, 62A (heat radiating members) for closing C, 61C are formed, and the cover 62A is made of transparent plastic having an insulating property while transmitting heat radiated from the terminal portion 41A. And are formed integrally.

By arranging the heat radiating means 66 as described above, the radiated heat radiated from the heat radiating terminal portion 41A toward the cutout portion 61C is not interrupted by the metal front case 61 but is applied to the outer case 60. Released outside. Further, since the lid 62A for closing the notch 61C is made of a transparent plastic, the radiant heat emitted from the notch 61C is transmitted through the lid 62A without being blocked by the lid 62A. Released outside.

The notches 61C, 61C, the lids 62A, 62A and the terminal portion 41A are so close to each other that they do not interfere with each other, and the dimensions of the front case 61 and the back case 62 in the approaching direction are reduced. It is formed as follows.

(2) Effects of the Embodiment According to the above embodiment, the following effects can be obtained.

The radiant heat radiated from the terminal portion 41 A to which a high voltage is applied is transmitted to the notch 6
Since the terminal portions 41A are discharged from the outer case 60 from 1C and 61C, the terminal portion 41A is efficiently cooled, and a rise in temperature inside the device can be suppressed. Therefore, the display device 1
(1) Deterioration of display performance due to a rise in internal temperature can be suppressed. Further, the heat radiating means 66 can be configured with a simple structure. Further, the terminal portion 41A and the outer case 60
Can be shortened, and the miniaturization of the display device 11 can be promoted.

Since the notch 61C is covered with a lid 62A (heat radiating member) made of transparent plastic that transmits radiant heat, it is possible to prevent foreign matter from entering from outside without impairing the heat radiating effect. it can.

Since the cover 62A that covers the notch 61A has insulating properties, it is possible to prevent static electricity from entering the display device 11 from the notch 61A, and to prevent deterioration of display performance and damage to the device due to the static electricity. Can be prevented.

Since the cover 62A has an insulating property, the cover 62A can be arranged close to the terminal portion 41A, and the size of the display device 11 can be further reduced.

The lid 62A is formed integrally with the back case 62, and can be manufactured simultaneously with the manufacture of the back case 62. Therefore, the manufacturing effort is reduced and the number of members can be reduced. it can. At the same time assembling the back case 62 and the front case 61, the cover 62A
Cover the notch 61C, so that the assembly is easy.

Although the back case 62 is made of transparent plastic, 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 and other display devices can be provided. Since the radiant heat radiated from the heat generating portion incorporated in the inside of the display device 11 can also be radiated to the outside, the temperature rise inside the display device 11 can be further suppressed.

(3) Modifications of Embodiment The present invention is not limited to the above-described embodiments, but includes the following modifications.

In the above embodiment, the notches 61C, 61C of the front case 61 constituting the heat radiating means 66 are
Although it was provided substantially on the extension of 1A, it is not limited to this. One of the shapes connecting the two notch portions 61C, 61C
One notch may be used. And even in this case, the same effect as described above can be obtained.

In the above embodiment, the outer case 60 is used.
Is configured as a two-body structure including the front case 61 and the back case 62, but is not limited thereto, and may be an exterior case having an integral structure. In this case, the outer case is made of a metal material or a plastic material that does not transmit radiant heat, and if a cutout 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.

In the above-described embodiment, the lid 62A as a heat radiating member is formed integrally with the back case 62 made of transparent plastic. However, the present invention is not limited to this. It may be formed and 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.

In the above-described embodiment, the fluorescent tube 41 used in the backlight device 40 has a W-shape. The invention can be applied.

Further, in the above embodiment, the liquid crystal panel 3
0 is a separately formed liquid crystal display panel 31,
Although it is constituted by the panel shield frame 32 and the diffusion plate 33, the invention is not limited thereto, and a unit formed by incorporating a liquid crystal display panel or the like in advance may be used.

In the above-described embodiment, the backlight device 40 is composed of the backlight main body 45 and the heat conducting plate 46. However, the present invention is not limited to this. May be used.

Further, in the above embodiment, the liquid crystal panel 3
The backlight device 40 as a back light source of 0 uses a so-called direct-type backlight, but is not limited to this. That is, a so-called edge type (side type) backlight may be used as the back light source. In this case, the luminous flux 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 disposed on the back side of the liquid crystal panel, and the like. Irradiated on the back.

In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0049]

According to the above-described display device, since the radiant heat radiated from the terminal portion to which the 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 rise in temperature inside the device can be suppressed, and deterioration of display performance due to a rise in internal temperature can be suppressed. In addition, the terminal portion and the outer case can be brought closer to each other, whereby the size of the display device can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a structure of a display device according to an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a structure of a display control board in the embodiment.

FIG. 3 is an overall perspective view illustrating the display device according to the embodiment.

[Explanation of symbols]

 Reference Signs List 11 display device 30 liquid crystal panel as light modulation device 40 backlight device as light source device 41 fluorescent tube (light source) 41A terminal portion 50 display control board 60 outer case 61 front case (first case) 61C Notch 62 Back case (second case) 62A Lid (radiator)

Claims (8)

[Claims] 1. A display device comprising: a light source device having a light source and a terminal portion for applying a voltage to the light source; and a light modulation device for modulating a light beam emitted from the light source device. An outer case that covers a part of the light modulator; and the outer case is provided with a heat radiating unit that emits radiant heat radiated from the light source or the terminal portion to the outside of the outer case. A display device characterized by the above-mentioned. 2. The display device according to claim 1, wherein the outer case is made of a metal material or a plastic material that does not transmit the radiant heat, and the heat dissipating means arranges the terminal portion on the outer case. A display device characterized in that the display device is configured as a cutout portion formed according to the following. 3. The display device according to claim 1, wherein the outer case is configured to include a first case made of metal and a second case made of plastic, and the heat radiating means is provided on the first case. A display device comprising a cutout formed according to the arrangement of terminal portions. 4. The display device according to claim 2, wherein the cutout portion is provided with a heat radiating member that covers the cutout portion and transmits the radiant heat. apparatus. 5. The display device according to claim 4, wherein the heat radiating member is formed of a transparent material. 6. The display device according to claim 4, wherein the heat radiating member has an insulating property. 7. The display device according to claim 4, wherein said heat radiating member is formed of plastic. 8. The display device according to claim 3, wherein the cutout portion is provided with a plastic heat dissipation member that covers the cutout portion and transmits radiant heat. A display device integrated with two cases.