JPWO2016163078A1 - Display device - Google Patents

Abstract

Make it easier to clear the windshield cloudiness. The display device (1) includes a display (2) that displays information, and a reflector (3) that reflects the information displayed on the display (2) and projects it in the field of view ahead of the driver's seat. In the device (1), the display (2) includes a display unit (21), a light source (23) that irradiates the display unit (21), and a heat radiating unit (25) that radiates heat from the light source (23). The reflector (3) is disposed in the vicinity of the windshield (4) and reflects the information displayed on the display (2), and the reflector (31) A heat transfer part (32) provided at least in part, and the heat transfer part (32) is connected to the heat dissipation part (25).

Description

  The present invention relates to a display device.

  2. Description of the Related Art Conventionally, a head-up display in which a combiner provided separately from a front wind (wind shield) of a vehicle is provided near the front window at the upper part of an instrument panel is known (for example, Patent Document 1).

JP 2009-080178 A

  However, for example, as shown in Patent Document 1 and FIGS. 1A and 1B, a combiner provided at the top of the instrument panel shields the warm air from the defroster, and it takes time to clear the fog on the front window. There was a problem that would hang. In order to solve this problem, a method of moving the combiner from the driver center (front) to the outside of the vehicle can be considered, but in this case, the visibility of the head-up display is lowered. Moreover, although the method of moving the ventilation opening of a defroster duct to the front of a combiner is considered, in this case, a combiner's back surface becomes cloudy and a wind speed distribution will be biased. Furthermore, a method of providing a defroster blower opening both before and after the combiner as disclosed in Japanese Patent Application Laid-Open No. 2009-196606 is conceivable. This causes a problem of interference between the facilities.

  An object of the present invention made in view of such a point is to provide a display device that facilitates clearing the fog of a windshield.

In order to solve the above problem, a display device according to a first aspect is:
A display for displaying information;
A reflector that reflects the information displayed on the display to reflect in the field of view in front of the driver's seat,
The indicator is
A display unit;
A light source for illuminating the display unit;
A heat dissipating part that dissipates heat from the light source,
The reflector is
Placed close to the windshield,
A reflective member that reflects the information displayed on the display;
A heat transfer section provided on at least a part of the reflecting member,
The heat transfer part is connected to the heat dissipation part.

In order to solve the above problem, in the display device according to the second aspect,
The heat transfer part is formed integrally with the heat dissipation part.

In order to solve the above problem, in the display device according to the third aspect,
The heat transfer section is in contact with the windshield.

In order to solve the above problem, in the display device according to the fourth aspect,
The heat transfer part is in contact with the windshield through a heat conductive sheet.

In order to solve the above problem, in the display device according to the fifth aspect,
A control unit that controls turning on or off the light source;
The controller is
The light source is turned on when a defroster for clearing the fogging of the windshield is operating and the display is not used.

  According to the display device according to the first aspect, it becomes easy to clear the fog of the windshield.

  According to the display device according to the second aspect, since the heat transfer section and the heat dissipation section are integrally formed, the fogging of the windshield can be more efficiently cleared.

  According to the display device according to the third aspect, since the heat transfer section comes into contact with the windshield, more heat is transferred to the windshield, and the cloudiness can be more effectively cleared.

  According to the display device according to the fourth aspect, the heat transfer portion contacts the windshield via the heat conductive sheet, so that not only can heat of the light source be efficiently transferred, but also the heat transfer portion is transferred to the windshield by shaking. It is also possible to suppress the contact sound generated by touching or leaving.

  According to the display device according to the fifth aspect, the windshield can be clouded even when the display is not used.

It is sectional drawing of a vehicle when the head-up display which concerns on a prior art is installed. It is sectional drawing of a vehicle when the head-up display which concerns on a prior art is installed. It is sectional drawing of a vehicle when the display apparatus which concerns on one Example of this invention is installed. It is sectional drawing of the indicator which concerns on one Example of this invention. It is a front view of the reflector which concerns on one Example of this invention. It is the front view and sectional drawing of a display apparatus which concern on the 1st Example of this invention. It is a figure which shows sectional drawing and the graph of the display apparatus which concern on 1st Example of this invention. It is sectional drawing of the display apparatus which concerns on the 1st Example of this invention. It is sectional drawing of the display apparatus which concerns on the 1st Example of this invention. It is the front view and sectional drawing of a display apparatus which concern on the 2nd Example of this invention. It is a front view of the display apparatus which concerns on the 2nd Example of this invention. It is the front view and sectional drawing of the display apparatus 1 which concern on the 3rd Example of this invention. It is a figure which shows the operation | movement flow of the control part of the display apparatus of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 2 is a cross-sectional view of the vehicle when the display device 1 according to one embodiment of the present invention is installed. The display device 1 is a head-up display, for example. In FIG. 2, a display device 1 including a display 2 and a reflector 3, a windshield 4, a side ventilator duct 5, a defroster 6, an air outlet member (air grill) 7, a front defroster air 8, , An instrument panel 9, an instrument panel opening 9a, and a meter 10 are shown.

  The lower part of the display device 1 is provided inside an instrument panel 9 that houses the defroster 6, the side ventilator duct 5, and the like. The display device 1 includes a control unit (not shown), and performs detection of whether or not the engine is operating and control of turning on or off the light source 23. The control unit is a processor such as a CPU (Central Processing Unit), for example.

  As shown in FIG. 3A, the display 2 includes, for example, a display unit 21, a diffusion plate 22, a light source 23, a conductive insulating sheet 24, and a heat dissipation unit 25. The display unit 21, the diffusion plate 22, the light source 23, and the conductive insulating sheet 24 are laminated in this order from the top. The display device 2 may be configured by only the display unit 21, the light source 23, and the heat radiating unit 25. The display 2 displays information such as the speed of the automobile or navigation for driving. At least a part of the display 2 is accommodated in the instrument panel 9.

  The display unit 21 is composed of, for example, an LCD (Liquid Crystal Display). The display unit 21 may be configured by an organic EL display or an inorganic EL display.

  The diffusion plate 22 diffuses the light emitted from the light source 23. The diffused light irradiates the surface of the display unit 21 facing the light source 23 substantially uniformly.

  The light source 23 is, for example, an LED (Light Emitting Diode), and irradiates the display unit 21. In FIG. 3A, the light source 23 comprises 10 LEDs.

  The conductive insulating sheet 24 is a sheet having a heat conducting function and transmitting heat from the light source 23 to the heat radiating unit 25. The conductive insulating sheet 24 also has an insulating function, and insulates the light source 23 and the heat radiating portion 25 from each other.

  The heat radiation part 25 is, for example, a heat sink. The heat radiating portion 25 contacts the light source 23 directly or indirectly through the conductive insulating sheet 24. Since the heat radiating section 25 receives and radiates heat from the light source 23, the light source 23 is cooled as a result. Preferably, the heat radiating portion 25 is made of a metal such as aluminum or copper in order to enhance the heat radiating effect. The heat radiating portion 25 may have heat radiating fins to enhance the heat radiating effect, but does not have heat radiating fins in order to radiate (transfer) more heat to the outside of the instrument panel 9. May be.

  The heat radiation part 25 is connected to the heat transfer part 32 outside the instrument panel 9 to enhance the cooling (heat radiation) performance. Details will be described in Examples 1 to 3 described later.

  The heat radiating part 25 is used as a fixed part of the reflector 3 by being connected to the heat transfer part 32 of the reflector 3.

  With the above configuration, the heat from the light source 23 provided in the instrument panel 9 can be radiated to the outside of the instrument panel 9 without spreading in the instrument panel 9. Further, by transferring the heat generated by heat radiation to the windshield 4, the defrosting function by the defroster 6 can be assisted. This is the same principle as a defogger that removes window fogging with heat rays.

  As illustrated in FIG. 3B, the reflector 3 includes a reflecting member 31 and a heat transfer unit 32. In the example of FIG. 3B, the reflector 3 has a rectangular shape and includes a half mirror material. As shown in FIG. 2, the reflector 3 is arranged close to the windshield 4 (within a predetermined distance from the windshield 4). For this reason, for example, it is possible to realize two points: extending the imaging distance and preventing light reflected on the windshield 4 on the back surface (vehicle front side surface) of the reflector 3 from entering the driver's field of view. Can do. The reflector 3 displays the information display radiated from the display device 2 in the field of view of the driver in front of the driver's seat (left side in FIG. 2) by, for example, virtual image display.

  The reflecting member 31 may be a resin half mirror material, for example. At this time, the reflection member 31 transmits the scenery in front of the driver and reflects the information displayed on the display device 2 to display the scenery together with the scenery. Here, the reflecting member 31 may be opaque as long as it reflects information displayed on the display 2. Further, the reflecting member 31 may be colored.

  The heat transfer section 32 is made of a heat conductive material, and is provided on a part of the reflection member 31 (for example, the back surface, the periphery, etc.). In the example of FIG. 3B, it is provided around the reflecting member 31. The heat transfer part 32 is connected to the heat dissipation part 25 directly or indirectly by a conventionally known method. Further, the heat transfer part 32 may be formed integrally with the heat dissipation part 25. In the case of integral formation, it is expected that the heat transfer efficiency between the heat transfer section 32 and the heat dissipation section 25 is further increased.

  Refer to FIG. 2 again. The windshield 4 is a partition provided in front of the vehicle, and is made of, for example, glass. The side ventilator duct 5 is a duct for performing ventilation in the vehicle. The defroster 6 is a device that blows warm air (front defroster air 8) for clearing the window fogging of the windshield 4 through an air outlet member (air grill) 7. The warm air of the defroster 6 can also be expected to remove dust attached to the reflector 3.

  The instrument panel 9 is a panel that houses a meter 10 or the like indicating the vehicle speed, the engine speed, the remaining amount of gasoline, and the like. The instrument panel 9 has an instrument panel opening 9 a for displaying the information display radiated by the display device 2 on the reflector 3.

[First embodiment]
FIG. 4A is a front view (upper left figure) and a sectional view (lower right figure) of the display device 1 according to the first embodiment of the present invention. The said front view is a figure at the time of seeing the reflector 3 from the windshield 4 side (vehicle front side).

  In FIG. 4A, the heat transfer section 32 connected to the heat radiating section 25 protrudes outside the instrument panel 9. The heat transfer section 32 is arranged along the back surface of the reflecting member 31. A non-transmissive (for example, black) reflecting member 31 is fixed to a surface of the protruding heat transfer section 32 on the vehicle rear side (the side opposite to the windshield 4 with respect to the heat radiating section 25, that is, the driver side).

  As shown in FIG. 4B, in the case of the first embodiment, the total distance from the center of the display 2 to the tip of the heat transfer section 32 is 10 mm + 30 mm + 100 mm = 140 mm. As shown in the lower right graph of FIG. 4B, the heat radiation temperature at the tip of the heat transfer section 32 is expected to be equivalent to the heat generation temperature between the heat wires of the defogger, for example. Since the heat radiation temperature at the tip of the heat transfer section 32 to which the heat from the heat radiation section 25 is transmitted is equal to the temperature between the hot wires, the effect of assisting the windshield 4 to eliminate fogging is expected.

  As shown in FIG. 4C, the heat transfer section 32 and the windshield 4 are in contact with each other by line contact or surface contact. As an alternative example, the heat transfer section 32 and the windshield 4 may be contacted by point contact. With this configuration, the heat transfer section 32 (or the heat transfer section 32 and the reflection member 31) warms the windshield 4 and removes fog. The contact is not essential, and they may be close as long as the effect of removing the windshield 4 is expected. That is, the heat transfer unit 32 may be disposed within a predetermined distance from the windshield 4.

  As shown in the right figure of FIG. 4D, the heat conductive sheet 11 can be provided in the contact part between the heat-transfer part 32 (or the heat-transfer part 32 and the reflection member 31) and the windshield 4. As shown in FIG. The heat conductive sheet 11 not only has an effect of efficiently transferring the heat of the heat transfer section 32 to the windshield 4 but also a contact caused by the heat transfer section 32 coming into contact with or moving away from the windshield 4 due to the shaking of the vehicle. The effect of suppressing the sound can also be expected. In other words, the effect of relaxing the impact at the time of contact using the flexibility of the heat conductive sheet 11 can be expected.

  According to the first embodiment, the heat transfer unit 32 is connected to the heat dissipation unit 25 for cooling the light source 23 of the display 2. Since heat is transmitted to the outside of the instrument panel 9 by the heat transfer section 32, the clouding of the windshield 4 can be eliminated by heat radiation from the heat transfer section 32 that is in contact with or close to the windshield 4. Furthermore, the cooling (heat radiation) performance of the light source 23 of the heat radiating section 25 can be enhanced, and the heat burn in the instrument panel 9 can be suppressed.

[Second Embodiment]
FIG. 5A is a front view (upper left figure) and a cross-sectional view (lower right figure) of the display device 1 according to the second embodiment of the present invention. The said front view is a figure at the time of seeing the thermal radiation part 25 from the windshield 4 side (vehicle front side).

  In FIG. 5A, the heat transfer section 32 connected to the heat radiating section 25 protrudes outside the instrument panel 9. The heat transfer part 32 is arranged along the outer periphery of the reflecting member 31. That is, the heat transfer section 32 has a shape of a frame along the outer periphery of the reflecting member 31, and the reflecting member 31 inside the frame is transparent. The reflector 3 of the second embodiment functions as a combiner that projects information displayed on the display 2 together with the scenery in front of the driver. According to the second embodiment, since the reflector 3 has transparency that allows the vehicle front to be visually recognized, in addition to the effect of the first embodiment, the driver's visibility can be further improved. Play.

  FIG. 5B is a diagram illustrating a state of thermal resistance of the heat transfer section 32 in the second embodiment. The figure on the left is an enlarged view of the broken line part of the figure on the right. The thermal resistance is a value representing difficulty in transmitting temperature, and indicates the amount of temperature increase per unit amount of heat generation. As the cross-sectional area of the heat transfer section 32 is larger, the thermal resistance is smaller and the thermal conductivity is higher. Here, when the heat transfer section 32 is formed in a frame shape as in the second embodiment, the cross-sectional area of the heat transfer section 32 is reduced, so that the thermal resistance can be increased and the thermal conductivity can be decreased. In the example of FIG. 5B, L ′ has a larger thermal resistance than L and a lower thermal conductivity. Therefore, it is necessary to adjust the cross-sectional area of the heat transfer part 32 according to the required thermal conductivity. Here, the heat transfer part 32 does not need to be in the shape of a frame along the outer periphery of the reflector 3, and may be provided on at least a part of the reflection member 31. For example, the heat transfer unit 32 may be provided along the lower side and the left and right sides excluding the upper side of the reflection member 31. Further, for example, the heat transfer section 32 has a frame shape substantially along the outer periphery of the reflector 3, but may have a discontinuous portion in part.

[Third embodiment]
FIG. 6 is a diagram showing a third embodiment. In FIG. 6, although the heat radiating part 25 does not protrude outside the instrument panel 9, the heat sink part extends to the vicinity of the instrument panel opening 9a. The heat conductive translucent film 12 is affixed to the heat radiating part 25 in the instrument panel 9. The heat conductive translucent film 12 functions as the heat transfer portion 32 and is arranged along the back surface of the reflecting member 31 outside the instrument panel 9. The reflector 3 is in contact with or close to the windshield 4.

  The transmittance | permeability of the heat conductive translucent film 12 is 90% as an example. The reflector 3 according to the third embodiment functions as a combiner that displays information displayed on the display device 2 together with the scenery in front of the driver. The heat conductive translucent film 12 is affixed to the back surface (front surface of the vehicle) of the transparent reflecting member 31. For this reason, although the thermal radiation part 25 is arrange | positioned in the instrument panel 9, it can thermally radiate outside the instrument panel 9 through the heat conductive translucent film 12. FIG.

  According to the third embodiment, since the flexible thermally conductive translucent film 12 and the heat radiating portion 25 are connected, in addition to the effects of the second embodiment, the processing is relatively easy. There is an effect. Moreover, since the processing is easy, the manufacturing cost can be suppressed. Here, in the third embodiment, the heat sink portion of the heat radiating portion 25 extends to the vicinity of the instrument panel opening 9 a to increase the contact area with the heat conductive translucent film 12. However, if heat can be sufficiently conducted to the heat conductive translucent film 12, the heat sink portion of the heat radiating portion 25 may not be extended. Moreover, the heat conductive translucent film 12 is affixed not only on the back surface of the reflecting member 31 but also on the entire reflecting member 31, around the reflecting member 31, or on the surface of the reflecting member 31 (surface on the vehicle rear side). May be.

  The heat conductive translucent film 12 is, for example, a film in which a fine copper lattice pattern is formed, and is a film having a substantially transparent appearance and high heat conductivity. In addition, as another example of the heat conductive translucent film 12, a large crystal that is impossible with a conventional single crystal can be produced, and has a thermal conductivity more than 10 times that of optical glass and exceeding that of sapphire. Is mentioned.

[Operation flow]
FIG. 7 is a diagram showing a defrosting operation flow by the display device 1 according to an embodiment of the present invention.

  The control unit of the display device 1 detects that the engine is operating (step S2) in a state where the window is still clouded before traveling (step S1). When the control unit detects that the defroster 6 is operating (step S3), it checks whether the display device 2 is being used (step S4). When the display 2 is used (Yes in step S4), the control unit checks whether or not the windshield 4 has been defrosted (step S6).

  On the other hand, when the display 2 is not used (No in step S4), the control unit turns on the light source 23 to perform heat dissipation to assist the defrosting of the windshield 4 (step S5), and then the windshield 4 It is confirmed whether or not clouding has been eliminated (step S6). For example, the control unit determines whether or not clouding has been eliminated based on whether or not a predetermined time (for example, 10 minutes) has elapsed since the defroster 6 was activated. As long as the cloudiness is not eliminated, the control unit repeats the confirmation process in step S6. When the cloudiness is eliminated, the control unit automatically stops the defroster 6 and ends the operation flow.

  In this way, even when the display device 2 is not used, the control unit turns on the light source 23 to enable heat radiation by the heat radiation unit 25, and as a result, assists the function of eliminating the fogging of the windshield 4. Can do.

  The case where the present invention is applied to a vehicle has been described above. However, the present invention is not limited to this, and a display device that performs display of a virtual image by reflecting display light from a display device with a reflector, which needs to remove fogging of the windshield (for example, Applicable to aircraft and ships). In addition, since those skilled in the art can make various changes and modifications to the arrangement and configuration based on the present disclosure, it should be noted that these changes and modifications are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display 3 Reflector 4 Windshield 5 Side ventilator duct 6 Defroster 7 Air outlet member (air grill)
8 Air for front defroster 9 Instrument panel 9 a Instrument panel opening 10 Meter 11 Thermal conductive sheet 12 Thermally conductive translucent film 21 Display unit 22 Diffusion plate 23 Light source 24 Conductive insulating sheet 25 Heat radiation unit 31 Reflecting member 32 Heat transfer section

Claims (5)

A display for displaying information;
A reflector that reflects the information displayed on the display to reflect in the field of view ahead of the driver's seat, and a display device comprising:
The indicator is
A display unit;
A light source for illuminating the display unit;
A heat dissipating part that dissipates heat from the light source,
The reflector is
Placed close to the windshield,
A reflective member that reflects the information displayed on the display;
A heat transfer section provided on at least a part of the reflecting member,
The heat transfer unit is connected to the heat dissipation unit. The display device according to claim 1,
The display device, wherein the heat transfer section is formed integrally with the heat dissipation section. The display device according to claim 1,
The display device, wherein the heat transfer section is in contact with the windshield. The display device according to claim 3,
The display device, wherein the heat transfer section is in contact with the windshield via a heat conductive sheet. The display device according to claim 1,
A control unit that controls turning on or off the light source;
The controller is
A display device characterized in that the light source is turned on when a defroster for clearing window fog of a windshield is operating and the display is not used.

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