JPH0422364Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a heat dissipation structure for a display device using a light-receiving display member such as a transparent plate or a liquid crystal element.

[Conventional technology]

In recent years, liquid crystal elements have been used as instruments for vehicles such as automobiles and motorcycles, which control the transmission or non-transmission of light by changing the arrangement of liquid crystal molecules when voltage is applied, and display symbols such as predetermined letters and numbers according to the shape of the electrode. A display device using a light-receiving type display member is used, and in particular, regarding the structure of this type of liquid crystal display device when illuminating it using a lighting device such as a lamp, the Utility Model Application Publication No. 1983-
There is one disclosed in Japanese Patent No. 63914 and shown in FIG.

That is, in the liquid crystal display device 1, a light guide 3 for a surface light source made of a light-guiding resin material is disposed inside an instrument case 2 having a display window portion 2a formed in segments. In front of the light guide body 3 is a liquid crystal element 4 having a display portion, and behind the light guide 3 is a circuit board 6 configuring a drive circuit including electronic components 5 for applying a signal voltage to the liquid crystal element 4. conductive rubber (not shown) for electrically connecting between the electrode terminals of the liquid crystal element 4 and predetermined terminals of the circuit board 6 is disposed in the vertical direction of the light guide 3; A lamp 7 serving as an illumination device is mounted and fixed on the bottom of the instrument case 2 so as to face the side surface of the light guide 3, and prevents local irradiation and temperature rise inside the instrument case 2 caused by the lamp 7. Therefore, a heat dissipating member 8 made of a material with good thermal conductivity and surrounding the lamp 7 is attached.

By causing the lamp 7 to emit light, the display portion of the liquid crystal element 4 is illuminated with light passing through the inside of the light guide 3, and the display portion can be viewed from the display window portion 2a. On the other hand, the heat generated by the light emission of the lamp 7 is conducted through the heat radiating member 8 to prevent localized high temperatures.

Furthermore, regarding this type of heat dissipation structure,
There is a device disclosed in Japanese Patent No. -145078, which has a structure in which a heat dissipating member 8 is interposed between the liquid crystal element 4 and the light guide 3.

[Problem that the invention attempts to solve]

By the way, in the conventional example, the heat radiating member 8, which is attached to prevent the inside of the instrument case 2 from becoming high temperature due to the heat generated by the lamp 7, faces the light emitting part of the lamp 7 and controls the light and receives the heat generated. Since the heat dissipating part and the part to be attached to the instrument case 2 are required to be in separate locations, the shape becomes complicated and large in the vertical direction, which causes problems such as narrowing the space inside the instrument case 2 or the light guide 3. Since the structure is simply interposed between the liquid crystal element 4 and the liquid crystal element 4, there have been problems such as difficulty in positioning and poor assembly workability.

[Purpose of invention]

This invention aims to provide a heat dissipation structure for a display device using a light-receiving display member that is illuminated by a lighting device such as a lamp, which can provide a large internal space of the display device and also has good assembly workability. purpose.

[Summary of the idea]

In order to achieve the above object, this invention includes a light-receiving display member, a light guide located below the light-receiving display member, and a part of the light guide that faces the light-receiving member through the light guide. A display device comprising an illumination member for illuminating a mold display member, a heat dissipation member integrally provided with a heat receiving part facing the illumination member and a heat dissipation part for dissipating heat, and a guide groove portion for disposing the heat dissipation member. and the light guide provided on the upper surface.

〔Example〕

Figures 1 to 3 show a liquid crystal display device to which an embodiment of the present invention is applied, and the same or equivalent parts as in the conventional example shown in Figure 4 are given the same reference numerals and details thereof are shown. I'll omit the explanation.

The fixing member 9, which serves as a reference part during the assembly work of the liquid crystal display device 1, has a box shape with a bottom, and has a storage part 9b in which the illumination lamp 7 is stored in the bottom wall 9a, and a side wall 9c facing opposite to each other. A notch 9d and a pair of substantially hook-shaped positioning portions 9e are formed in which the heat dissipating member 8 is positioned.

The light guide 3 has through-holes 3a at appropriate locations corresponding to the storage portions 9b, and has a shape slightly larger than the shape of the heat-radiating member 8, which is continuous from the through-holes 3a on the upper surface, and has a shape that is slightly larger than the shape of the heat-radiating member 8. A guide groove portion 3b having a depth approximately equal to or slightly deeper than the thickness is formed.

The heat dissipating member 8 is made of a material with good thermal conductivity such as aluminum, and is attached to the upper surface of the light guide 3. The heat dissipating member 8 is positioned at a heat receiving point 8a facing the lamp 7 and a fixing member 9 as described later, and dissipates heat. A dissipating heat radiation portion 8b is integrally formed.

That is, when assembling the liquid crystal display device 1, the light guide 3 is positioned and arranged above the fixing member 9, the heat dissipating member 8 is guided in the guide groove 3b of the light guide 3, and the light guide Through hole 3a of body 3
is covered with the heat receiving part 8a of the heat radiating member 8, and the heat radiating part 8b of the heat radiating member 8 is inserted into the positioning part 9e of the fixing member 9, and the heat radiating member is positioned. A liquid crystal element 4 is positioned and disposed through the liquid crystal element 4, and above the liquid crystal element 4, a holding member 11 made of a metal material is hooked to a fixing member so as to come into contact with the peripheral edge of the liquid crystal element 4. , the circuit board 6 with the lamp 7 attached is screwed to the lower part of the fixing member 9 so that the lamp 7 is housed in the housing part 9b of the fixing member 9, and the holding member 11 and the liquid crystal element are screwed in order from above. 4. The heat insulating member 10, the heat dissipating member 8, the light guide 3, the fixing member 9, and the circuit board 6 form a laminate, and this laminate is installed inside the instrument case 2.

Therefore, in the laminate of the liquid crystal display device 1, since the heat dissipation member 8 is guided within the guide groove portion 3b of the light guide 3, the thickness in the vertical direction is not increased due to the heat dissipation member 8. Therefore, the internal space of the display device can be made larger, and since the heat radiating portion 8b of the heat radiating member 8 is inserted and positioned in the positioning portion 9e of the fixing member 9, the heat radiating portion and position can be changed as in the conventional case. There is no need to provide a separate location from the location where the decision is made.

By emitting light from the lamp 7, the light passes through the light guide 3 and illuminates the display portion of the liquid crystal element 4 disposed in front of the laminate, and heat is generated at the heat receiving portion 8a of the heat dissipating member 8. The heat is transmitted from to the heat dissipation point 8b,
Dissipate heat to prevent localized high temperatures.

In the above embodiment, the heat radiation part 8b of the heat radiation member 8 was inserted into the positioning part 9e of the fixing member 9 for horizontal positioning. If the heat dissipating member 8 is positioned by press-fitting the heat dissipating member 8 narrower, it is possible to position the heat dissipating member 8 not only in the horizontal direction but also in the vertical direction, and the laminate can be made more stable as a holding member for the light guide 3.

Further, the heat radiating member 8 can have a desired number of heat receiving locations 8a and heat radiating locations 8b.

Furthermore, even if the lamp 7 is located outside the laminate, the heat receiving portion 8a of the heat dissipating member 8 can be formed in an elongated manner.

[Effect of idea]

This invention includes a light-receiving display member, a light guide located below the light-receiving display member, and an illumination lamp that faces a part of the light guide and illuminates the light-receiver display member through the light guide. A display device comprising: a heat radiating member integrally provided with a heat receiving part and a heat radiating part facing the illumination member; and the light guide having a guide groove on its upper surface for arranging the heat radiating member. Since the heat dissipation member is guided into the guide groove of the light guide to form a laminate, the influence of the heat dissipation member on the vertical thickness is eliminated, and the heat dissipation member Since there is no need to take up space within the instrument case, the internal space of the display device can be increased.

Furthermore, the heat dissipation structure based on this idea has practical value, such as a substantially flat plate type that can be arranged in a stacked state, and the heat dissipation location also serves as a positioning location, making it easy to mold and easy to assemble. Provides a high heat dissipation structure.

[Brief explanation of the drawing]

1 to 3 are a perspective view, an exploded perspective view, and a sectional view showing a liquid crystal display device to which an embodiment of this invention is applied, and FIG. 4 is a sectional view showing a conventional liquid crystal display device. DESCRIPTION OF SYMBOLS 1...Liquid crystal display device (display device), 2...Instrument case, 3...Light guide, 3a...Through hole, 3b...
...Guide groove portion, 4...Liquid crystal element (light receiving type display member),
7... Lamp (lighting device), 8... Heat dissipation member, 8
a...Heat receiving location, 8b...Heat radiation location, 9...Fixing member, 9b...Storage section, 9c...Side wall, 9e...
positioning point.

Claims (1)

[Scope of utility model registration request] It consists of a light-receiving display member, a light guide located below the light-receiving display member, and an illumination member that faces a part of the light guide and illuminates the light-receiver display member through the light guide. The display device includes a heat radiating member integrally provided with a heat receiving part and a heat dissipating part facing the illumination member, and the light guide having a guide groove provided on the upper surface for arranging the heat radiating member. A heat dissipation structure for a display device characterized by: