JP4873130B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly, to a display device including a heat absorbing member that absorbs heat generated by a light emitting display.

Conventionally, various head-up display devices for vehicles using a liquid crystal display have been proposed. Such a vehicle head-up display device 1 projects display light L onto a transflective plate called a vehicle windshield or combiner to display a virtual image. The vehicle head-up display device 1 includes a liquid crystal display 4 and a reflecting mirror 5 housed in a housing 3 having a translucent window portion 2, and the display light L emitted from the liquid crystal display 4 is reflected. It is reflected by the mirror 5 and projected onto the windshield or transflective plate (see FIG. 5).
JP 2005-315931 A

  The liquid crystal display 4 includes a liquid crystal display panel 6 and a light emitting element 7 such as a light emitting diode that transmits and illuminates the liquid crystal display panel 6. The liquid crystal display panel 6 includes a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates on which a transparent electrode film is formed, and polarizing plates attached to both front and rear surfaces of the liquid crystal cell. The heat sink 8 absorbs heat generated by the light emitting element 7, and a large number of flat plate-shaped heat radiation fins 8 a are exposed at the opening 3 a of the housing 3.

However, since the opening 3a is formed in the housing 3, there is a problem that the rigidity of the housing 3 in the vicinity of the opening 3a is low. In order to solve this problem, it is conceivable to eliminate the opening 3 a of the housing 3. However, if the housing 3 does not have the opening 3 a, the heat sink 8 is sealed in the housing 3, so Sex is reduced.
The present invention provides a display device having a housing having an opening for exposing a part of a heat sink and having high rigidity.

According to the present invention, the light-emitting display 15, the heat absorbing members 40 and 60 that absorb heat generated by the light-emitting display 15, and at least the light-emitting display 15 are accommodated. The housings 17 and 57 include openings 17a and 57a that expose portions of the heat absorbing members 40 and 60, and one end sides of the openings 17a and 57a . possess reinforcing means 17d for reinforcing the opening 17a located on the opposite direction, the opening 17a is formed so as to cover the other end of 57a, the vicinity of the 57a, and 57d, the the said one end The housings 17 and 57 have upper case bodies 51 and 61 and lower case bodies 52a and 62a, and the reinforcing means 17d and 57d are first parts provided on the upper case bodies 51 and 61. Strong portion 51a, 61a and the provided in the lower case body 52, 62 first reinforcement portion 51a, a second reinforcement portion 52a abutting against the 61a, those having a 62a.

  Further, according to the present invention, the light emitting display 15 includes a liquid crystal display panel 19 and a light emitting element 20 that transmits and illuminates the liquid crystal display panel 19.

The present invention, as set forth in claim 3, wherein the heat absorbing member 40 and 60 are those having a plurality of radiating fins 40b, the 60b.

  By providing the housing with an opening that exposes a part of the heat absorbing member, the heat dissipation of the heat absorbing member is improved, and the rigidity of the housing is increased by providing the reinforcing portion.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 3 show a first embodiment. The head-up display device 11 is disposed in the dashboard 12 of the vehicle (see FIG. 2). The display light L projected by the head-up display device 11 is reflected by the windshield 13 to the observer 14. The observer 14 can visually recognize the virtual image V superimposed on the landscape.

  The head-up display device 11 has a liquid crystal display 15 and a reflector 16 accommodated in a housing 17. The liquid crystal display 15 includes a liquid crystal display panel 19, a light emitting diode 20, and a case body 21. The case body 21 has a substantially rectangular tube shape, and the liquid crystal display panel 19 is held at the front end of the case body 21. The rear end portion of the case body 21 is fixed to a heat sink described later. The light emitting diode 20 is disposed behind the liquid crystal display panel 19 and illuminates and transmits the liquid crystal display panel 19. The light emitting diode 20 is mounted on the circuit board 27.

  The reflector 16 includes a concave mirror 30, a holding member 31, and a stepping motor 32. The concave mirror 30 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 30a. The reflective surface 30a is a concave surface, and the display light L emitted from the liquid crystal display 15 is enlarged to display the virtual image V. The concave mirror 30 is bonded to the holding member 31 with a double-sided adhesive tape. The holding member 31 is made of resin (for example, ABS), and the gear portion 34 and the shaft portion 35 are integrally formed.

  A gear 37 is attached to the rotation shaft of the stepping motor 32, and the gear 37 is engaged with the gear portion 34 of the holding member 31. The concave mirror 30 is supported so as to be rotatable together with the holding member 31, and the projection direction of the display light L can be adjusted by rotating the concave mirror 30 by the stepping motor 32. The observer 14 adjusts the angle of the concave mirror 30 by operating a push button switch (not shown) so that the display light L is reflected at the position of the eyes (that is, the virtual image V can be visually recognized).

  Reference numeral 40 denotes a heat sink, and the heat sink 40 is disposed in the vicinity of the opening 17 a of the housing 17. The heat sink 40 is fixed to the housing 17 by a flange portion 40a with a screw (not shown). The heat sink 40 radiates heat of the light emitting diode 20 to the outside of the housing 17 through a heat conductive sheet 41 made of an elastic body such as silicone rubber. The heat sink 40 has a large number of flat plate-shaped heat radiation fins 40b extending in the left-right direction, and the heat radiation fins 40b are exposed to the outside. Reference numeral 42 denotes a rectangular annular packing member, and the packing member 42 prevents the dust from entering the housing 17 by closing the space between the heat sink 40 and the opening 17 a of the housing 17.

  The housing 17 includes an upper case body 51 and a lower case body 52, and the upper case body 51 is provided with a window portion 44 through which the display light L is emitted. This window part 44 consists of translucent resin (for example, acrylic), and has a curved shape. The upper case body 51 of the housing 17 is provided with a light shielding wall 17c to prevent a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display 15 and the virtual image V becomes difficult to see. The light shielding wall 17 c has a flat plate shape and is formed so as to hang obliquely from the upper part of the upper case body 51.

  The housing 17 is provided with reinforcing means 17d for reinforcing the vicinity of the opening 17a. The reinforcing means 17d is formed to straddle the opening 17a from the upper side to the lower side of the opening 17a. The reinforcing means 17d includes a first reinforcing portion 51a having an L-shaped cross section formed on the upper case body 51 and a second reinforcing portion 52a having an L-shaped cross section formed on the lower case body 52. It is. The first reinforcing portion 51a and the second reinforcing portion 52a are in contact with each other, and form a ventilation path A having open ends on the left and right.

  FIG. 4 shows a second embodiment. The second embodiment is different from the first embodiment only in the heat sink 60 and the reinforcing means 57d of the housing 57, and the other configurations are the same as those in the first embodiment, and thus detailed description thereof is omitted.

  The housing 57 includes an upper case body 61 and a lower case body 62. The housing 57 is provided with reinforcing means 57d for reinforcing the vicinity of the opening 57a. The reinforcing means 57d extends across the opening 57a so as to span from the left to the right of the opening 57a. The reinforcing means 57 d includes a first reinforcing portion 61 a formed on the upper case body 61 and a second reinforcing portion 62 a formed on the lower case body 52. The first reinforcing portion 61a and the second reinforcing portion 62a are in contact with each other, and form a ventilation path B having open ends at the top and bottom. The heat sink 60 has a large number of flat plate-shaped heat radiation fins 60b extending in the vertical direction.

  In the first and second embodiments, the housings 17 and 57 are provided with the openings 17a and 57a for exposing the heat radiation fins 40b and 60b of the heat sinks 40 and 60, so that the heat dissipation of the heat sinks 40 and 60 is high. In addition, the housings 17 and 57 are provided with reinforcing portions 17d and 57d straddling the openings 17a and 57a, so that the housings 17 and 57 have high rigidity. It is to be noted that the direction in which the heat radiation fins 40b and 60b of the heat sinks 40 and 60 extend and the direction of the open ends of the air passages A and B formed by the reinforcing portions 17d and 57d are the same. This is because the flow of air to be cooled is taken into consideration.

Sectional drawing which shows 1st embodiment of this invention. The general-view figure of the head up display which shows embodiment same as the above. BB sectional drawing of FIG . Cross sectional view showing a second embodiment of the present invention. Sectional drawing which shows a prior art example.

15 Liquid crystal display (light emitting display)
17 housing 17a opening 17d reinforcing means 19 liquid crystal display panel 20 light emitting diode (light emitting element)
40 Heat sink (heat absorption member)
40b Radiation fin 51 Upper case body 51a First reinforcing part 52 Lower case body 52a Second reinforcing part 57 Housing 57a Opening part 57d Reinforcing means 60 Heat sink (heat absorbing member)
60b Radiating fin 61 Upper case body 61a First reinforcing part 62 Lower case body 62a Second reinforcing part

Claims (3)

A display device comprising: a light-emitting display; a heat absorbing member that absorbs heat generated by the light-emitting display; and a housing that houses at least the light-emitting display;
The housing is formed to cover an opening exposing a part of the heat absorbing member, and the other end side of the opening located in a direction opposite to the one end side of the opening and the one end side. and reinforcing means for reinforcing the vicinity of the opening, it was closed,
The housing includes an upper case body and a lower case body, and the reinforcing means is provided on the first reinforcing portion provided on the upper case body and on the first reinforcing portion provided on the lower case body. A display device comprising a second reinforcing portion in contact therewith. The display device according to claim 1, wherein the light emitting display includes a liquid crystal display panel and a light emitting element that transmits and illuminates the liquid crystal display panel. The display device according to claim 1, wherein the heat absorbing member has a plurality of heat radiating fins .

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