WO2020194724A1

WO2020194724A1 - Display device and mounting structure for display device

Info

Publication number: WO2020194724A1
Application number: PCT/JP2019/013825
Authority: WO
Inventors: 克彦岸本
Original assignee: 堺ディスプレイプロダクト株式会社
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-01
Also published as: JPWO2020194724A1

Abstract

A display device is provided with: a display panel that has a first surface including a display screen composed of a plurality of pixels and a second surface opposite the first surface; and a holding member that is provided at least at the edge portion of the display panel to hold the display panel on a prescribed flat or curved surface whereon the display panel is mounted. The holding member is provided with a heater for generating heat to warm the display screen.

Description

Display device and mounting structure of display device

The present disclosure relates to a display device and a mounting structure of the display device.

Display devices such as liquid crystal displays and organic EL displays are not limited to indoors in buildings, but inside vehicles, as they become thinner and lighter, and their display performance and adaptability to various usage environments are improved. Or, it is also used outdoors. For example, Patent Document 1 discloses a transmissive liquid crystal display panel integrally incorporated with an automobile windshield. This transmissive liquid crystal display panel is provided above the windshield in front of the driver's seat.

JP-A-2009-227018

Display devices will be used in a temperature and humidity environment that changes more widely than before due to the diversification of the places where they are installed or carried. In addition, the temperature and humidity around the display device can change independently with time. The display device is required to be able to promptly and accurately visually recognize the displayed image to the user even under such a situation where the physical environment changes widely and variously.

Therefore, an object of the present disclosure is to provide a display device and a mounting structure of the display device that can prevent or eliminate the deterioration of the visibility of the display image due to changes in the surrounding environment.

A display device according to an embodiment of the present disclosure includes a display panel having a first surface including a display screen composed of a plurality of pixels, a second surface which is an opposite surface of the first surface, and the display panel. A holding member provided at least at the edge of the display panel to hold the display panel on a predetermined flat surface or curved surface to be mounted, the holding member includes a heater that generates heat to heat the display screen. It is characterized by being.

Further, the mounting structure of the display device according to the embodiment of the present disclosure includes the display device and a film body provided on one surface formed of a predetermined flat surface or curved surface facing the interior of the vehicle, and the film body. Has a higher thermal conductivity than the material constituting the second surface of the display panel, and the display device directs the display screen into the room and emits the film body from the heater. It is characterized in that it is attached to the one surface via the film body in order to receive heat conducted through the film.

According to each embodiment of the present disclosure, it is possible to easily prevent or eliminate the deterioration of the visibility of the displayed image due to the change in the surrounding environment.

It is a schematic diagram which shows an example of the display device attached to the windshield of an automobile which has the attachment structure of the display device of Embodiment 1 of this disclosure. FIG. 1 is a cross-sectional view taken along the line II of FIG. It is a schematic side view which shows the display device which has the attachment structure of the display device of Embodiment 1 together with an automobile. It is a schematic top view which shows the other arrangement example of the display device in the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the display device of Embodiment 1. FIG. It is a schematic front view which shows the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the other display device of Embodiment 1. FIG. It is a schematic front view which shows the mounting structure of the other display device of Embodiment 1. It is a schematic front view which shows the arrangement example of another heater in the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the arrangement example of another heater in the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the arrangement example of another heater in the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the arrangement example of another heater in the mounting structure of the display device of Embodiment 1. FIG. FIG. 5 is a sectional view taken along line II-II of FIG. 5B showing an example of the display device of the first embodiment. FIG. 5 is a schematic cross-sectional view showing another example of the display device of the first embodiment. FIG. 5 is a schematic cross-sectional view showing another example of the display device of the first embodiment. FIG. 5 is a schematic cross-sectional view showing another example of the display device of the first embodiment. FIG. 5 is a schematic cross-sectional view showing another example of the display device of the first embodiment. It is a block diagram which shows the relationship of each element in the mounting structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows an example of the film body in the attachment structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 1. FIG. It is a schematic front view which shows the example which provided the wind guide body in the mounting structure of the display device of Embodiment 1. FIG. FIG. 11A is a sectional view taken along line III-III of FIG. 11A. It is a schematic front view which shows the example which provided the windshield in the mounting structure of the display device of Embodiment 1. FIG. FIG. 12A is a sectional view taken along line IV-IV of FIG. 12A. It is a schematic front view which shows an example of the film body in the attachment structure of the display device of Embodiment 2. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 2. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 2. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 2. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 2. It is a schematic front view which shows another example of the film body in the attachment structure of the display device of Embodiment 2. It is a block diagram which shows the relationship of each element in the mounting structure of the display device of Embodiment 2.

The present inventor has found a problem that the visibility of the display screen may be lowered in actual use even if the display device is in a physical environment within the range assumed at the time of design. As an example, in a vehicle such as an automobile, as the temperature of the outside air decreases, the temperature of the partition wall material that separates the inside of the vehicle from the outside of the vehicle, such as a window glass, decreases, and dew condensation may occur on the surface thereof. In addition, even when a person gets on board in a low temperature environment, dew condensation may occur as the humidity in the passenger compartment rises. In such a case, if a liquid crystal display panel is provided on the windshield of an automobile like the liquid crystal display panel of Patent Document 1 described above, dew condensation occurs on the display screen and the visibility thereof deteriorates. As a result, the safety confirmation in front of the vehicle may be hindered. Further, if the liquid crystal display panel is provided to display a scene behind or to the side of the automobile, safety confirmation in each direction may be hindered. In addition, it may be necessary to wait for the vehicle to start until such dew condensation disappears.

Automobiles are generally equipped with a defroster (defroster) that eliminates dew condensation by blowing hot air on the windshield from below. However, when a display device is provided on the upper part of the windshield as in the liquid crystal display panel of Patent Document 1, a certain amount of time is required to eliminate the dew condensation by the wind sent from the defroster. Further, in general, the windshield is fixed to the vehicle body so that its upper side is inclined to the rear of the vehicle. In this regard, the present inventor further describes that the display device provided on the upper part of the windshield has a problem of eye focus adjustment based on the proximity of the display device to the human eye in the vehicle interior, as will be described in detail later. I found it to be inherent. Therefore, from these viewpoints, it is considered that there is an advantage obtained by providing the display device in the lower part of the windshield when the display device is provided in the interior of the vehicle, particularly in the windshield of the automobile.

However, if the hot air of the defroster provided to eliminate the dew condensation on the entire windshield is directly applied to the display device, there is a concern that the heat will accelerate the deterioration of the display device. Further, it may be difficult to evenly apply hot air to the display device. In such a case, there is a concern that the hot air hit by the non-uniformity causes the non-uniformity of the temperature rise of the display device, and as a result, the progress of deterioration is locally promoted. In particular, since the heat resistance of the organic EL element contained in the organic EL display device is lower than that of a liquid crystal or the like, there is a concern that the organic EL element may be deteriorated by hot air repeatedly blown over time in the organic EL display device. Further, when the display device is fixed to the front panel by using an adhesive or the like, there is a concern that the display device may be peeled off from the windshield due to a decrease in adhesive force due to the heat of hot air and wind pressure. Therefore, it is desired that the display device mounted on the vehicle can prevent or eliminate the dew condensation that may occur on the display screen without depending on the mounting position, much less relying on the action of the defroster. In view of such a situation, the present inventor has found a new display device and a mounting structure for the display device, respectively.

Hereinafter, the display device and the mounting structure of the display device according to the embodiment of the present disclosure will be described with reference to the drawings. The materials, shapes, and relative positional relationships of the components in the embodiments described below are merely examples. The display device of each embodiment and the mounting structure of the display device are not limitedly interpreted by these. Further, in the following, each embodiment will be described by taking as an example a case where a display device is attached to the windshield of an ordinary passenger car. However, the display device mounting structure, the display device mounting method, and the dew condensation prevention method of the display device of the embodiment can be adopted not only in ordinary automobiles but also in various vehicles such as buses, trucks, and trains.

[Embodiment 1]
[Display device mounting structure]
The overall configuration of the mounting structure of the display device of the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows the display device 1 which is an example of the display device having the display device mounting structure of the first embodiment of the present disclosure together with the inside of the vehicle interior R. The display device 1 is attached to the windshield 3 of the automobile C in a state of being in contact with the pillar P on the right front side. FIG. 2 shows an example of the mounting structure of the display device of the first embodiment corresponding to the cross section taken along the line II of FIG.

In the mounting structure of the display device 1 of the present embodiment, the display device 1 is provided on one side 3a of the windshield 3 of the automobile C facing the vehicle interior R, as shown in FIG. A film body 2 is preferably provided on one surface 3a of the windshield 3 in order to diffuse the heat generated by the heater 121, and a weak adhesive layer 4 is provided on the surface of the film body 2. Then, the display device 1 is attached to one surface 3a of the windshield 3 via the weak adhesive layer 4 with the display screen 11a facing the inside of the vehicle interior R.

As described above, the display device 1 is attached to one surface 3a via the holding member 12 so that at least the display screen 11a can be heated by the heat generated based on the energization of the heater 121. Therefore, the temperature of the display screen 11a can be made higher than the ambient temperature thereof and the temperature of the windshield 3. Further, even when the ambient temperature of the display device 1 is low and therefore the saturated water vapor amount is small, dew condensation which tends to occur on the display screen 11a can be prevented. Further, when dew condensation occurs, the dew condensation can be eliminated by passing an electric current through the heater 121. Similarly, even when the humidity of the passenger compartment R rises to exceed the saturated water vapor amount when the temperature of the windshield 3 is relatively low, dew condensation on the display screen 11a can be prevented or eliminated by passing an electric current through the heater 121. Can be done. That is, the dew condensation on the display screen 11a can be prevented or eliminated without relying on the action of the defroster, and therefore the decrease in visibility due to such dew condensation can be prevented or the visibility can be restored. In addition, restrictions on the mounting position of the display device 1 can be reduced, and the degree of freedom thereof can be increased. As a result, it is considered that it can contribute to the improvement of vehicle operation safety and vehicle convenience.

The display device 1 in the example of FIG. 1 is attached in the lower region of the windshield 3 in contact with the pillar P on the right front side. A defroster (not shown) outlet B is provided on the upper surface of the dashboard D, which is close to the lower part of the display device 1. However, as described above, in the display device 1 having the mounting structure of the present embodiment, dew condensation on the display screen 11a can be prevented or eliminated without using the hot air of the defroster.

The display device 1 is fixed on one surface 3a of the windshield 3 by using the holding member 12. That is, the holding member 12 is fixed to one surface 3a of the windshield 3 using an adhesive (not shown in FIGS. 1 and 2), and the display device 1 is moved on the one surface 3a and the display device 1 from the one surface 3a. Is limited by the holding member 12. The adhesion strength between the holding member 12 and the windshield 3 is preferably greater than 5.0 N / 10 mm and preferably 20 N / 10 mm or less. The display device 1 may be fixed to one surface 3a of the windshield 3 by the adhesive force of the weak adhesive layer 4.

In the example of FIG. 1, an image pickup device 9 for capturing a front view through the windshield 3 is provided on the ceiling of the passenger compartment R above the windshield 3. The display device 1 displays, for example, an image captured by the image pickup device 9. The display device 1 may display an image based on an image signal sent from a navigation system or the like. The image pickup device 9 is a digital camera having, for example, a CCD image sensor or a CMOS image sensor.

With reference to FIG. 3, the merits obtained by providing the display device 1 below the upper part of the windshield 3 of the automobile C as in the example of FIG. 1 will be described. FIG. 3 shows the mounting structure of the display device 1 of the first embodiment together with the automobile C as viewed from the side of the automobile C. Further, the display device 1x is shown as a virtual display device provided on the upper part of the windshield 3. In front of the automobile C, an object OB to be visually recognized by the driver M, such as a pedestrian or a preceding vehicle, is shown.

In the windshield 3 of a passenger car type automobile as shown in the automobile C of FIG. 3, the upper side is often inclined toward the rear of the vehicle, that is, toward the passenger compartment R. Therefore, the distance between the upper part of the windshield 3 and the driver M is shorter than the distance between the lower part of the windshield 3 and the driver M. Therefore, when the display device 1x is provided on the upper part of the windshield 3, the distance L1 between the display device 1x and the driver M is the display device 1 and the operation when the display device 1 is provided on the lower part of the windshield 3. The distance to the person M is shorter than the distance L2.

On the other hand, the driver M looks further ahead than the windshield 3 for many hours while driving, and focuses his eyes on the object OB to be visually recognized, for example, a pedestrian. The distance L3 between the object OB to be visually recognized and the driver M is longer than both the distance L1 and the distance L2, but the difference between the distance L2 and the distance L3 is smaller than the difference between the distance L1 and the distance L3. Therefore, the driver M looking at the object OB outside the vehicle can focus faster by focusing on the display device 1 than by focusing on the display device 1x.

On the contrary, the driver M looking at the display device 1 or the display device 1x provided on the windshield 3 is faster when looking at the display device 1 than when looking at the display device 1x. You can focus on the object OB. Therefore, it may be possible to detect the danger ahead earlier. For example, adjusting the focus of the human eye can take more than a second. A car traveling at a speed of 60 km / h travels more than 15 m in one second. Therefore, from the viewpoint of safe vehicle operation, it is preferable that the fluctuation of the distance between the object to be focused (for example, the object OB and the display device 1) and the driver M is as small as possible. That is, when the display device 1 is attached to the windshield 3 of the automobile C, it is preferably attached to the lower part of the windshield 3 in order to secure an appropriate distance between the display device 1 and the driver M. When a defroster (not shown) is operated at the time of dew condensation, a high temperature strong wind is blown to the lower part of the windshield 3, but in the present embodiment, the dew condensation on the display screen 11a can be eliminated without using the defroster.

For example, the display device 1 is attached to the windshield 3 below the center of the automobile C in the vertical direction. In that case, the display device 1 can be moved away from the driver M as compared with the case where the display device 1 is attached to the upper side of the windshield 3. The display device 1 may be attached to a region of the windshield 3 within 150 mm from its lower edge. In that case, the display device 1 may be the farthest away from the driver M. Moreover, even when the display device 1, the film body 2, and the weak adhesive layer 4 do not have transparency, they may satisfy the criteria for the transparency of the windshield of the vehicle in the country of use of the vehicle. For example, in the "Notification [2018.10.16] <Section 1> Article 39 (Windshield)" in the "Safety Standards for Road Transport Vehicles" by the Ministry of Land, Infrastructure, Transport and Tourism of Japan, it is fixed. It is permitted to install various devices on the windshield of vehicles that meet the requirements of.

[Other display device arrangement examples]
Another arrangement example of the display device 1 will be described with reference to FIG. In the mounting structure of the display device of the present embodiment in the example of FIG. 4, two display devices 1 (first display device 1A and second display device 1B) are mounted on one surface 3a of the windshield 3.

The automobile C in the example of FIG. 4 is not provided with the side mirror SM as depicted by the alternate long and short dash line in FIG. However, the automobile C is provided with a first image pickup device 9a for photographing the right rear view of the automobile C and a second image pickup device 9b for photographing the left rear view of the automobile C. The first and second

image pickup devices

9a and 9b are generally attached to the outside of the left and right doors to which the side mirror (door mirror) SM is attached. The first and second

image pickup devices

9a and 9b are digital cameras having, for example, a CCD image sensor or a CMOS image sensor.

In the example of FIG. 4, the first display device 1A displays at least the right rear view of the automobile C taken by the first image pickup device 9a. Further, the second display device 1B displays at least the left rear view of the automobile C photographed by the second image pickup device 9b. Although not shown, between each image pickup device and each display device, display target data is selected from the image pickup image data generated by each image pickup device, and converted into display image data suitable for each display device. In addition, a processing circuit for enlarging or reducing the image as needed is provided.

The first and

second display devices

1A and 1B are attached to the lower region of the windshield 3 as in the display device 1 of the example of FIG. Therefore, the driver M can quickly switch the focal position of the eyes between when looking at the scene outside the vehicle ahead and when looking at the first display device 1A or the second display device 1B.

Further, in the example of FIG. 4, the first display device 1A is attached to the intersection of the right end of the front edge of the automobile C on the windshield 3 and the virtual straight line IL1 connecting the driver's seat DS of the automobile C in the top view. There is. Further, the second display device 1B is attached to the intersection of the left end of the front edge of the automobile C on the windshield 3 and the virtual straight line IL2 connecting the driver's seat DS of the automobile C in the top view. When two display devices (first and second display devices 1a and 1b) are arranged as in the example of FIG. 4, the driver M can see the right rear view by looking at the front right side. You can see the scene of the left rear by looking at the left front. Therefore, the driver M can see the scene in the direction corresponding to his / her movement with respect to the left and right, as compared with the case where both the left and right scenes are displayed close to each other in the central portion in the vehicle width direction, for example. Therefore, it is presumed that there is little misunderstanding regarding the left and right in the safety confirmation behind the driver M.

If the automobile C has a roundness between the left and right ends of the front edge and the side edge, the rounded portion is the left end portion or the right end portion. The virtual straight lines IL1 and IL2 are straight lines connecting any part of the rounded portion with the driver's seat DS. Further, the virtual straight lines IL1 and IL2 are straight lines connecting any part of the driver's seat DS in the vehicle width direction with the left end portion or the right end portion of the front edge of the automobile C, respectively. Further, "attached to the intersection" means that the first display device 1A is attached so as to overlap the intersection of the windshield 3 and the virtual straight line IL1, and the second display device 1B is attached to the windshield 3 and the virtual straight line IL2. It means that it will be installed so that it overlaps the intersection.

The display device 1 can be provided not only in ordinary passenger cars but also in any vehicle including buses, trucks, trains, and the like. The "predetermined flat surface or curved surface" to which the display device 1 is attached is not limited to the windshield 3 of the automobile C. For example, the display device 1 may be provided on the side or rear window of the automobile C, or on the window of the driver's seat or the passenger's seat of the train, or may be provided on the surface of any interior material facing the interior of the vehicle. ..

[Display device]
As shown in FIGS. 1 and 2, the display device 1 of the present embodiment is provided on a display panel 11 having a display screen 11a for displaying an image and an edge portion of the display panel 11 and holds the display panel 11. It includes a holding member 12. The holding member 12 is electrically connected to a heater 121 (see FIG. 2) that generates heat for heating the display screen 11a, a power supply path (not shown) provided inside a pillar P on the right front side of the automobile, and the like. The first connection terminal 124 (see FIG. 1) and the second connection terminal 125 (see FIG. 1) that are electrically connected to the display panel 11 are provided.

Examples of the display panel 11 used in the display device 1 include an organic EL display panel, a liquid crystal display panel, and a micro LED display panel, which may have a thin form. The organic EL display panel, the liquid crystal display panel, or the micro LED display panel includes a plurality of pixels (not shown) arranged in a matrix and a substrate having a thin film transistor (TFT) for driving each of the plurality of pixels on one surface. May include. The display screen 11a is composed of such a plurality of pixels. When the display device 1 is attached to a window glass such as a windshield 3, an organic EL display panel that is easily formed to have translucency as compared with a liquid crystal display panel or a micro LED display panel is preferable as the display panel 11. .. That is, the display panel 11 in the present embodiment may be formed by using a material having translucency. In this case, it is preferable that the member arranged between the display panel 11 and the windshield 3 is also formed by using a translucent material. When the display panel 11 or the like has translucency in this way, a person in the passenger compartment R can see the front view through the display device 1 when the image is not displayed on the display device 1.

When the display panel 11 is an organic EL display panel, the translucent display panel 11 has, for example, a transparent polyimide resin film, indium tin oxide (ITO), zinc oxide (zinc oxide), or the like. It can be formed by using a conductive material and a transparent amorphous oxide semiconductor such as an oxide composed of indium, gallium, and zinc.

The display panel 11 of FIGS. 1 and 2 is provided with a temperature sensor 11b (see FIG. 2). The temperature sensor 11b mainly detects the temperature of the display screen 11a heated by the heat of the heater 121. The temperature sensor 11b can also detect the temperature around the display screen 11a if it has appropriate detection performance. The detection result of the temperature sensor 11b, that is, the output of the temperature sensor 11b including the temperature information around the display panel 11 and / or the display panel 11 is transmitted to the control unit 111 of the display panel 11 described later.

In the examples of FIGS. 1 and 2, the display panel 11 is provided with a control unit 111 (see FIG. 2) that controls energization of the heater 121. In FIG. 2, the control unit 111 is simply represented by a simple rectangular block so that its existence is conceptually shown. The control unit 111 controls the start and stop of energization of the heater 121, as will be described later. Therefore, the control unit 111 is connected via the second connection terminal 125 in order to control the amount of electricity supplied to the heater 121. Electric power is supplied to the control unit 111 and the heater 121 from a power source (not shown in FIGS. 1 and 2). The energization of the heater 121 may be controlled by a processing device (not shown) such as a microcomputer possessed by the automobile C. In addition to the heater 121, the holding member 12 is connected to the first and

second connection terminals

124 and 125, and includes a conductive path 122 inside the holding member 12 for transmitting a signal input to the display panel 11 from the pillar P to the display panel 11. (See FIGS. 5A, 5B, and 8A).

The holding member 12 is formed of, for example, a synthetic resin such as a silicone resin, an epoxy resin, or an acrylic resin. Further, in order to transfer the heat generated in the heater 121 to the display panel 11 with high efficiency, alumina (thermal conductivity 30 W / m · K), boron nitride (thermal conductivity 60 W / m · K), aluminum nitride A powder having high thermal conductivity such as (thermal conductivity 170 W / m · K) and diamond (thermal conductivity 2200 W / m · K) may be dispersed in the synthetic resin. As described above, when the display panel 11 is made of a translucent material, the holding member 12 also does not contain these powders or impairs the translucency in order to have translucency. It is formed by containing it to a certain extent.

The heater 121 is formed of a material having electric heat such as a nickel (Ni) -chromium (Cr) alloy and an iron (Fe) -chromium (Cr) alloy, and generates heat when energized. The heater 121 is provided in a space-saving manner inside the holding member 12, and is formed in a linear or plate shape so as to be arranged over the entire holding member 12. When the display panel 11 is translucent, the heater 121 is also formed of ITO, zinc oxide, or the like, which has both good heat transfer and light transmissivity in order to have translucency.

The details of the holding member 12 will be described with reference to FIGS. 5 to 8. As shown in FIG. 5A, the holding member 12 has a square frame-shaped front shape, specifically, a U-shaped front shape lacking one side of the square front shape. In the display device 1 shown in FIGS. 1 and 2, as shown in FIG. 5B, the display panel 11 has an edge portion along three sides of the square front shape held by the holding member 12, and the display panel 11 is held along the remaining one side. The edge portion is fixed to one side 3a of the windshield 3 in a state of being in contact with the pillar P of the automobile. For example, the first connection terminal 124 is provided at both open ends of a pair of U-shaped sides facing each other, and the second connection terminal 125 is provided at the center of the bottom of the U-shape connecting the pair of sides. .. FIG. 8A is a sectional view taken along line II-II of FIG. 5B. Each side of the holding member 12 has a U-shaped cross-sectional shape including the recess 12R. The display panel 11 is inserted into the holding member 12 along the recess 12R.

The display device 1 attached in contact with the pillar P (see FIG. 1) is shown in FIGS. 5A and 5B. Examples of such a display device 1 include the display device 11 of FIGS. 1 and 2 or the first display device 1A of FIG. In this case, when the display panel 11 is inserted all the way into the opening 12A, the display panel 11 is detachably fixed to the holding member 12 by engaging with the second connection terminal 125. As a result, the display panel 11 is electrically connected to the holding member 12 via the second connection terminal 125. After that, the display device 1 is adhered in a state where the heater 121 and the conductive path 122 of the holding member 12 are electrically connected to the power supply path 23 and the communication path 24 provided in the pillar P via the first connection terminal 124, respectively. It is attached to the windshield 3 by an agent or a weak adhesive layer 4.

On the other hand, the display device 1 mounted away from the pillar P (see FIG. 1) is shown in FIGS. 6A and 6B. As such a display device 1a, the second display device 1B in FIG. 4 is exemplified. In this case, for example, the holding member 12a is composed of two members having a U-shaped planar shape, and the display panel 11 is inserted into the two holding member holding members 12a from the short sides facing each other of the display panel 11. When the display panel 11 is inserted all the way into the U-shaped planar shape of each of the holding members 12a, it is detachably fixed to the holding member 12a by engaging with the second connection terminal 125a of each of the holding members 12a. As a result, the display panel 11 is electrically connected via the second connection terminal 125a, and the display panel 11 and the holding member 12a are integrated as the display device 1. After that, the heater 121a and the conductive path 122a of the holding member 12a are electrically connected to the power supply path 23a and the communication path 24a formed on one surface 3a of the windshield 3 via the first connection terminal 124a, and the display device. 1 is attached to the windshield 3 by an adhesive or a weak adhesive layer 4. The surfaces of the power supply path 23a and the communication path 24a are prevented from being short-circuited by dust, dust, etc. in the vehicle interior R of the automobile C between the power supply paths 23a, the communication paths 24a, or between the power supply path 23a and the communication path 24a. Alternatively, it is covered with an insulating coating film 25 to prevent an unexpected electric shock. From such a viewpoint, it is preferable that the coating film 25 covers the entire power supply path 23a and the communication path 24a other than the electrical connection portion with the first connection terminal 124a on the windshield 3.

In the examples of FIGS. 5A and 5B, the holding member 12 includes one heater 121 over substantially the entire U-shaped region in front view, but as shown in FIGS. 7A-7D, they are electrically connected to each other. It may be provided with a plurality of heaters provided in each area so as to be separated from each other.

For example, in the example of FIG. 7A, the holding member 12a includes three heaters 121a1 to 121a3 provided one by one in each side region of the U-shape, and the heaters 121a1 to 121a3 have a power source shared with each other. Power is supplied from E. If a plurality of heaters 121a1 to 121a3 are provided in this way, each of the heaters 121a1 to 121a3 individually heats the region of each side of the U-shape, so that the uniformity of the heat transfer distribution over the entire display screen 11a can be improved. is there. Further, if power is supplied from the power sources shared by the heaters 121a1 to 121a3, the amount of heat generated by the heaters 121a1 to 121a3 may increase as a whole. Therefore, the temperature of the display screen 11a may rise quickly, and the dew condensation on the display screen 11a may be quickly eliminated. Further, since each of the heaters 121a1 to 121a3 has a simple linear shape, the holding member 12a is efficiently produced.

In the example of FIG. 7B, the holding member 12b includes the heaters 121b1 to 121b3 as in the example of FIG. 7A, but the heaters 121b1, 121b2, and 121b3 receive electric power from different power supplies E1, E2, and E3, respectively. Be supplied. In this case, if the amount of power supplied from each of the power sources E1 to E3 is adjusted, the heat transfer distribution to the display screen 11a can also be adjusted.

In the example of FIG. 7C, the holding member 12c includes six heaters 121c1 to 121c6 provided in two areas on each side of the U-shape. If a plurality of heaters 121c1 to 121c6 are provided in the areas on each side in this way, the temperature of the display screen 11a rises more rapidly when power is supplied from the shared power source, and dew condensation on the display screen 11a occurs. It will be resolved more quickly. Further, when power is supplied from different power sources, the uniformity of the heat generation amount distribution in the entire holding member 12c can be further enhanced, and dew condensation can be further prevented evenly over the entire display screen 11a. is there.

In the example of FIG. 7D, the holding member 12c includes heaters 121d1 and 121d2 partially arranged on one side of the U-shape, and heaters 121d3 arranged so as to straddle two adjacent sides of the U-shape. It is equipped with 121d4. If such heaters 121d3 and 121d4 are arranged, a material having excellent mechanical strength characteristics such as metal constituting the heaters 121d3 and 121d4 connects two adjacent sides inside the holding member 12c, so that the machine of the holding member 12c Target strength may increase.

In the example of FIG. 8A, the heat conductive film 123 is attached to the back surface 11r of the display panel 11. In the U-shaped cross section, the holding member 12 has a portion (first portion) 12R1 facing the front surface 11f at the edge portion of the display panel 11 to be inserted and a portion (first portion) facing the back surface 11r at the edge portion of the display panel 11. It has a portion (second portion) 12R2 and a portion (third portion) 12R3 facing the side surface at the edge portion of the display panel 11. As in the example of FIG. 8B, the second portion of the holding member 12e may be provided as a bottom portion 12R21 having a bottom surface 12R21a facing the entire back surface 11r of the display panel 11. In this case, the bottom surface 12R21a can support the heat conductive film 123 so that the heat conductive film 123 does not bend due to thermal expansion due to heat from the heater 121 and does not peel off from the back surface 11r of the display panel 11, so that the heat conductive film 123 is displayed. Thermal conductivity to the panel 11 may increase.

In the examples of FIGS. 8A and 8B, the heat conductive film 123 preferably has a higher thermal conductivity than the material constituting the back surface 11r. By interposing the heat conductive film 123 between the holding member 12 and the display panel 11 in this way, the heat generated from the heater 121 can be easily conducted to the back surface 11r of the display panel 11, so that the efficiency of heating the display screen 11a Is improved. As shown in FIG. 8A, if the heat conductive film 123 is further extended from the bottom surface 12R21a and provided over the entire area of the back surface 11r, for example, the heat diffusion in the heat conductive film 123 causes the entire display screen 11a to appear. May increase the uniformity of heat transfer distribution. Further, as in the example of FIG. 8B, the holding member 12e may have a bottom surface 12R21a when viewed from the front. In this case, the heat conductive film 123 is arranged so as to face the bottom surface 12R21a over the entire region when viewed from the front.

Examples of the heat conductive film 123 include a sheet made of expanded graphite, a sheet made of a silicone organic compound containing carbon black or carbon fibers, or an olefin organic compound. Since the heat conductive film 123 has the same function as the film body 2, when the heat conductive film 123 is used, the film body 2 is not always necessary, but the uniformity of the heat transfer distribution of the display screen 11a is further enhanced. Therefore, the film body 2 may be provided. When the display panel 11 has translucency, the heat conductive film 123 also has good heat transfer property and light transmissivity in order to have translucency, from a sheet or the like in which graphite particles are aligned in the film thickness direction. It is formed.

In the example of FIG. 8A, the holding member 12 is provided with the heater 121 in the U-shaped third portion 12R3 in the cross-sectional view, but the heater may be provided as shown in FIGS. 8B to 8D. For example, in the example of FIG. 8C, the holding member 12f includes a heater 121f1 in the first portion 12R1. If the heater 121f1 is provided in the first portion 12R1 in this way, the heater 121f1 becomes closer to the display screen 11a, so that the display screen 11a can be efficiently heated. Further, the holding member 12f includes a heater 121f2 in the second portion 12R2. If the heater 121f2 is provided in the second portion 12R2, the position of the heater 121f2 is close to the windshield 3, so that the windshield 3 is heated by the heat of the heater 121f2 when the temperature of the windshield 3 is relatively low. Be done. Therefore, the transfer of heat from the high temperature display panel 11 to the low temperature windshield 3 may be reduced. By using the holding member 12f, it is possible to improve the dew condensation prevention efficiency on the display screen 11a by these two actions.

In the example of FIG. 8D, the holding member 12g is provided with a heater 121g on the surface of the second portion 12R2 facing away from the first portion 12R1. When such a holding member 12g is used, the heater 121g directly heats the windshield 3, so that the temperature drop of the display panel 11 due to the transfer of heat to the windshield 3 as described above can be further prevented. is there.

In the example of FIG. 8E, the holding member 12h includes a heater 121h over the entire region of the surface of the second portion 12R2 facing away from the first portion 12R1. When such a holding member 12h is used, the heater 121h directly heats a wider area in the windshield 3 than the heater 121g in FIG. 8D, so that the temperature drop of the display panel 11 as described above is further prevented. You may get.

It is preferable to use thermal simulation to form the heater 121 having an appropriate cross-sectional shape so as to heat the display screen 11a as uniformly as possible. By doing so, it is possible to prevent a decrease in local display characteristics and life due to uneven heating of the display screen 11a.

[Control of energization to heater]
FIG. 9 shows a block diagram of the main elements involved in controlling the energization of the heater 121. As shown in FIG. 9, the display panel 11 includes a control unit 111 including a first control unit 111a and a second control unit 111b, a temperature measuring unit 112, and a time measuring unit 113. The holding member 12 further includes a switching element 126 in addition to the heater 121. The temperature measuring unit 112 monitors one or both of the temperature of the display screen 11a and the ambient temperature of the display screen 11a. The first control unit 111a is connected to the temperature measuring unit 112, and controls the energization of the heater 121 based on the output of the temperature measuring unit 112. The timekeeping unit 113 is connected to the second control unit 111b. The timekeeping unit 113 monitors, for example, the arrival of a preset time, and notifies the second control unit 111b of the arrival. The second control unit 111b controls the energization of the heater 121 based on the output of the timing unit 113.

In the example of FIG. 9, the display panel 11 and the heater 121 are connected to the power supply E in parallel. Specifically, the heater 121 is connected to the power supply E via the switching element 126. The switching element 126 has an input terminal for a signal that controls the open / closed state of the switching element 126, and the output of the control unit 111 is input to this input terminal. Examples of the switching element 126 include semiconductor elements such as various transistors, switching ICs, and electromagnetic relays. In the example of FIG. 9, the first and

second control units

111a and 111b start or stop the energization of the heater 121 by switching between the open state and the closed state of the switching element 126, and the energized state of the heater 121. Switch between non-energized state.

The power source E is an arbitrary external power supply source such as the battery of the automobile C. The display panel 11 and the heater 121 share the power supply E. By doing so, no power supply is required for each individual. The display panel 11 and the heater 121 may be supplied with power via a stabilizing circuit such as a voltage regulator. Further, the heater 121 may be supplied with electric power from a power source different from the power source for the display panel 11. The power source E may be a storage means such as a battery included in the display device 1, and in this case, power may be supplied from the display panel 11 to the heater 121.

The control unit 111 may be composed of a semiconductor integrated circuit such as a microcomputer, a gate array, or a programmable logic device that operates according to a control program consisting of a series of instruction sets. The first control unit 111a and the second control unit 111b are internal same functional blocks or different functional blocks such as a microcomputer constituting the control unit 111, and a series of instruction sets in a control program corresponding to those functional blocks. Can be composed of.

The temperature measuring unit 112 is composed of an arbitrary detection element that can detect the temperature around the display screen, such as the temperature sensor 11b (see FIG. 2) described above. The "temperature around the display screen" includes the temperature of the heater 121 and the temperature of the surface of the holding member 12. Examples of the temperature measuring unit 112 include a thermistor, a thermocouple, and an IC temperature sensor, but the detection element constituting the temperature measuring unit 112 is not limited to these.

For example, the first control unit 111a starts energizing the heater 121 when the temperature (detection temperature) detected by the temperature measuring unit 112 falls below the predetermined first temperature or falls below the first temperature. By doing so, dew condensation on the display screen 11a may be prevented. Further, the first control unit 111a stops the energization of the heater 121 when the detection temperature of the temperature measuring unit 112 becomes equal to or higher than a predetermined second temperature or exceeds the second temperature. By doing so, it may be possible to prevent the display panel 11 from becoming overheated. When the display panel 11 is an organic EL display device having relatively low heat resistance, such an overheat prevention function is particularly useful.

The timekeeping unit 113 is composed of, for example, a counter IC and a timer IC, and measures the passage of time. The timekeeping unit 113 may be configured by a counter function block or a timer function block included in a microcomputer or the like constituting the control unit 111. The timekeeping unit 113 may have both a calendar function and a 24-hour clock function according to the time system. The timekeeping unit 113 notifies the second control unit 111b of the arrival of a preset time and / or the passage of a preset time. The time measuring unit 113 may, for example, measure the elapsed time from the start of energization of the heater 121, or may measure the elapsed time from the stop of energization of the heater 121.

The second control unit 111b controls the energization of the heater 121 based on the output of the timekeeping unit 113. For example, the second control unit 111b starts energizing the heater 121 when it receives the output of the time counting unit 113 that notifies the arrival of a predetermined time. By doing so, when the automobile C is used at a fixed time every day, it may be possible to eliminate the dew condensation that has already occurred before the user gets on board. Further, the second control unit 111b stops the energization of the heater 121 when, for example, receives the output of the time measuring unit 113 notifying that a predetermined time has elapsed from the start of energization of the heater 121. In that case, by setting the time measuring unit 113 so as to notify the passage of time expected that the dew condensation is eliminated, the energization of the heater 121 is automatically stopped after the dew condensation is eliminated to prevent waste of electric power. Can be done.

The higher the voltage applied to the heater 121, the higher the electrical resistance of the heater 121 can be used, and therefore the smaller the current flowing through the heater 121. For example, by using a 24V power supply, it is possible to obtain the same calorific value Q as when using a 12V power supply by using a heater 121 having four times the electric resistance as compared with the case of using a 12V power supply. As a result, the current flowing through the heater 121 can be halved as compared with the case of using the 12V power supply. For example, a booster circuit VB such as a booster DC / DC converter that raises the voltage of the power supply E may be provided between the power supply E and the heater 121. By doing so, the current value can be reduced as described above, and the usable range of the electric resistance of the heater 121 can be expanded.

The booster circuit VB may be used to increase the amount of heat generated by the heater 121 per unit time. By doing so, it is possible to shorten the time required to bring a predetermined temperature rise to the display device 1. For example, by using a booster circuit that doubles the voltage without changing the electrical resistance of the heater 121, the time required to obtain a predetermined temperature rise can be reduced to 1/4.

As described above, the control unit 111 is provided, and the display device 1 is provided with the temperature measuring unit 112 (for example, the temperature sensor 11b on the display panel 11 shown in FIG. 2) to prevent overheating unnecessary for dew condensation elimination. Since it can be prevented, the display characteristics and the life of the display device 1 are not unnecessarily deteriorated.

In the example of FIG. 9, a communication unit 114 is further provided and connected to the control unit 111. The communication unit 114 exchanges signals with an external electronic device via an arbitrary communication protocol such as Bluetooth (registered trademark) or an arbitrary communication network such as a mobile phone network. For example, the communication unit 114 communicates with a mobile device such as a smartphone owned by the user of the vehicle, and transmits an instruction transmitted from the user to the control unit 111. For example, the control unit 111 starts energizing the heater 121 based on the dew condensation elimination instruction sent from the user. The communication unit 114 may be configured by a communication control module such as a Bluetooth® module, for example.

[Membrane body]
As shown in FIG. 2, the film body 2 is provided on one surface 3a of the windshield 3 and diffuses the heat generated from the heater 121 in a direction parallel to the one surface 3a of the windshield 3. The heat diffused inside the film body 2 may enhance the uniformity of the heat transfer distribution in the entire display screen 11a. The installation area of the film body 2 is determined according to the installation position of the display device 1.

The film body 2 is a thin film body having a higher thermal conductivity than the material constituting the back surface (second surface) of the display panel, and is formed on one surface 3a of the windshield 3 by, for example, sputtering or printing. .. The material of the film body 2 is silver (thermal conductivity 428 W / m · K), copper (thermal conductivity 403 W / m · K), gold (thermal conductivity 319 W / m · K), aluminum (thermal conductivity 236 W). Metals such as / m · K) are exemplified. When the display panel 11 is formed of a translucent material, the film body 2 may also be a translucent material such as ITO or zinc oxide in order to have translucency, and has translucency. It may be a metal thin film formed to a degree of thinness.

Compounds such as ITO and zinc oxide, and metals such as silver, copper, gold, and aluminum have reflection characteristics against infrared rays. Therefore, by forming the film body 2 using these compounds or metals, it is possible to prevent an unintended excessive temperature rise of the display device 1 due to irradiation with sunlight.

In the front view shown in FIG. 10A, the film body 2 has a rectangular front shape that is substantially similar to the front shape of the display device 1 shown by the alternate long and short dash line. The film body 2 is formed so as to have an area smaller than the area of the display device 1 in the front view, and the entire surface thereof is covered by the display device 1. Therefore, it is considered that the aesthetic appearance around the display device 1 is not spoiled. However, the film body 2 may have a larger area than the display device 1, such as the film body 2x drawn by the alternate long and short dash line on the outside of the display device 1 in FIG. 10A. It may be formed so that a part is exposed to the outside. The film body 2 which can be formed of ITO or Ti or the like can have a higher thermal conductivity than the windshield 3. Therefore, as will be described later, heating the exposed portion of the film body 2 using a heat source other than the film body 2 promotes the heating of the display screen 11a (see FIGS. 1 and 2). When the film body 2 larger than the display device 1 is provided like the film body 2x, the heater 121 provided in the holding member 12 and the film body 2 are electrically insulated and thermally connected. Is preferable. In order to realize such a configuration, an adhesive layer made of synthetic resin is formed at the interface between the film body 2 and the holding member 12, and the adhesive layer has high thermal conductivity and is made of an insulator. Alumina (thermal conductivity 30 W / m ・ K), boron nitride (thermal conductivity 60 W / m ・ K), aluminum nitride (thermal conductivity 170 W / m ・ K), diamond (thermal conductivity 2200 W / m ・ K) It is preferable to contain powder such as.

The film body 2a of another example shown in FIG. 10B is formed in a solid shape, that is, substantially the entire surface of the region X1 that can be occupied by the film body 2a, similarly to the film body 2 shown in FIG. 10A. However, the film body 2a is alternately provided with notches 2a1 extending from a pair of sides facing each other of the film body 2a toward the center of the film body 2a. In the film body 2a of FIG. 10B, three notches 2a1 are provided on the upper side and the lower side of the film body 2a, respectively. By providing the notch 2a1, the stress that may occur due to the difference in the coefficient of thermal expansion between the film body 2a and the windshield 3 (see FIG. 2) can be relaxed.

[Weak adhesive layer]
In the present embodiment, as shown in FIG. 2, the weak adhesive layer 4 is interposed between the display panel 11 and the film body 2 or the windshield 3, so that the display panel 11 and the film body 2 are surely adhered to each other. To do. Therefore, floating of the display panel 11 during use of the display device 1 and entrainment of air bubbles at the interface between the display panel 11 and the film body 2 are prevented. Further, when the film body 2 is provided, the weak adhesive layer 4 may promote heat transfer between the film body 2 and the display panel 11. Although "weak adhesive" adheres exactly to the adherend, it can be easily peeled off without damaging the adherend and without leaving glue or the like on the adherent surface by simply applying force in the peeling direction. It means the degree of adhesion that can be obtained.

The adhesion strength between the weak adhesive layer 4 and either or both of the display panel 11 and the film body 2 is, for example, 0.02 N / 10 mm or more and 5.0 N / 10 mm or less, preferably 1.5 N / 10 mm or more. , 2.0 N / 10 mm or less. If the adhesion strength in this range is obtained, it is considered unlikely that the display panel 11 will peel off from the film body 2 during use of the display device 1. On the other hand, when intentionally removing the display device 1, the display panel 11 can be easily removed from the front surface 3a by simply pulling the display device 1 with an appropriate force or inserting a thin plate into the interface to inject air. Can be done. For example, the display panel 11 can be easily replaced when the display device 1 is damaged.

The weak adhesive layer 4 is composed of, for example, an adhesive containing an acrylic, silicone, or urethane resin alone or in combination of two or more as a main component. When the display panel 11 has translucency, an acrylic or silicone-based resin that can have transparency is suitable as a material for the weak adhesive layer 4. The weak adhesive layer 4 contains, for example, these resins as main components. It is formed by arranging a weak adhesive sheet formed by molding the adhesive material into a predetermined shape between the display device 1 and the film body 2.

The synthetic resin constituting the weak adhesive layer 4 contains alumina (thermal conductivity 30 W / m · K) and boron nitride (thermal conductivity 60 W / m) in order to transfer heat to the display panel 11 and the film body 2 with high efficiency. -K), aluminum nitride (thermal conductivity 170 W / m · K), diamond (thermal conductivity 2200 W / m · K) and other powders with high thermal conductivity may be dispersed. As described above, when the display panel 11 is formed of a translucent material, the weak adhesive layer 4 also has translucency and therefore does not contain these powders or impairs translucency. It is formed by containing it to a certain extent.

[Wind guide]
The mounting structure of the display device of the examples of FIGS. 11A and 11B includes a display device 1, particularly a wind guide 8 for the wind blown into the display screen 11a, and the film body 2b is similar to the film body 2x of FIG. 10A. It has a larger area than the display device 1. The display device 1 is attached to one surface 3a of the windshield 3 via a film body 2b. The display device 1 is provided in the lower region of the windshield 3 as in the example of FIG. 1, and a defroster outlet B (see FIG. 1) is provided further below the display device 1. There is. Therefore, the wind guide 8 is provided between the display device 1 and the lower edge of the windshield 3, for example, on one surface 3a of the windshield 3 in order to block the wind blowing into the display screen 11a mainly from below.

In the examples of FIGS. 11A and 11B, the baffle 8 has a plate-like shape having a longitudinal direction and being curved two-dimensionally. The baffle 8 has substantially the same length in the longitudinal direction as the length in the longitudinal direction of the display device 1. One end surface (side surface) along the longitudinal direction of the baffle 8 is fixed to one surface 3a of the windshield 3.

The baffle 8 is preferably provided so as not to cover the display screen 11a. However, the wind guide 8 may be formed by using a material having translucency, and in that case, the display screen 11a may be covered by the wind guide 8. The material of the baffle 8 is not particularly limited, and any synthetic resin, metal, or the like can be used. Preferably, the baffle 8 is formed by using a material capable of having translucency such as acrylic or silicone, and the means for fixing the baffle 8 to one surface 3a is not particularly limited. For example, an epoxy-based or acrylic-based adhesive is used for fixing the air guide 8 to one surface 3a.

In the examples of FIGS. 11A and 11B, the film body 2b has an exposed portion 2b1 that is not covered by the display device 1. The film body 2b has a relatively large exposed portion 2b1 on the right and left sides of the display device 1 in the vehicle width direction (X direction in FIG. 11A) and on the upper side in the vehicle vertical direction (Y direction in FIG. 11A). are doing. As described above, the exposed portion 2b1 of the film body 2b can be used to promote the heating of the display screen 11a. For example, the baffle 8 is provided so that the wind H toward the display device 1, such as hot air from the defroster, is blown into the exposed portion 2b1 without being blown into the display device 1. For example, the air guide body 8 is provided with a portion that functions as a guide for directing the wind H toward the display device 1 from the outlet B (see FIG. 1) of the defroster toward the exposed portion 2b1. By doing so, it is possible to prevent the hot air from the defroster from blowing into the display device 1 and the display screen 11a, and to promote the heating of the display device 1 by using the heat of the hot air.

In the examples of FIGS. 11A and 11B, the wind guide 8 has an outer surface 8a that is directed in the direction opposite to the display device 1 and faces the wind H that hits the wind guide 8, and the outer surface 8a is in the direction opposite to the display device 1. It is curved so that it becomes convex. The outer surface 8a protrudes most in the central portion in the vehicle width direction in the direction opposite to the display device 1. That is, the outer surface 8a is closest to the defroster outlet B (see FIG. 1) at the central portion in the vehicle width direction, and is closest to the display device 1 and the film body 2b at both ends in the vehicle width direction. Therefore, the wind H blown to the wind guide body 8 flows along the curved outer surface 8a in the XY plane shown in FIG. 11A, and the exposed portion 2b1 of the film body 2b exposed on the right side and the left side of the display device 1 respectively. Is led to.

Further, as shown in FIG. 10B, the wind guide 8 is curved so as to be convex in the direction opposite to the display device 1 even in the front-rear direction of the vehicle (Z direction in FIG. 11B). Therefore, the wind H blown to the wind guide body 8 flows to the end of the wind guide body 8 along the outer surface 8a even in the YY plane shown in FIG. 11B. Then, the wind H flowing out from the end portion of the wind guide body 8 rises toward the windshield 3 because its temperature is higher than the ambient air, and hits the exposed portion 2b1 on the upper side of the display device 1 in the film body 2b.

As described above, in the examples shown in FIGS. 11A and 11B, the wind guide 8 has a guide portion extending to the exposed portion 2b1 so as to direct the wind H hitting the wind guide 8 toward the exposed portion 2b1 of the membrane body 2b, and the outer surface 8a. Have as. The wind H guided to the exposed portion 2b1 along the outer surface 8a heats the exposed portion 2b1. As an example, the film body 2b which can be formed of ITO or the like can generally have a higher thermal conductivity than the windshield 3. Therefore, the heat of the exposed portion 2b1 is efficiently conducted to the portion of the film body 2b covered by the display device 1. Therefore, the heat can promote the heating of the display screen 11a. The shape of the baffle 8 is not limited to the examples of FIGS. 11A and 11B. At least, it can function as a wind guide 8 as long as it can weaken the wind blown into the display device 1, particularly the display screen 11a.

In the examples shown in FIGS. 11A and 11B, the air guide 8 is provided separately from the display device 1, but the holding member 12 of the display device 1 facing the outlet B (see FIG. 1) of the defroster. It may be provided integrally with the holding member 12 on the lower side.

[Windshield]
The mounting structure of the display device in the examples of FIGS. 12A and 12B is different from the mounting structure of the display device in the examples of FIGS. 11A and 11B, and the film body 2 is not provided with an exposed portion. Further, instead of the wind guide body 8, a windshield 127 is provided integrally with the holding member 12 on the lower side of the holding member 12 of the display device 1.

The windshield 127 does not function as a guide for directing the wind H in a specific direction as in the wind guide 8 of FIGS. 11A and 11B, but simply from the outlet B (see FIG. 1) of the defroster to the display screen 11a. It functions as a windshield that blocks the wind H that blows toward it.

In the examples of FIGS. 12A and 12B, the windshield 127 is provided integrally with the holding member 12, but may be provided separately between the outlet B of the defroster and the display device 1.

[Embodiment 2]
FIG. 13A shows an example of the film body 20 in the mounting structure of the display device according to the second embodiment of the present disclosure. In the present embodiment, the film body 2 of the first embodiment is provided as the film body 20 that generates heat by energization. The heat generated from the film body 2 supplementarily heats the display screen 11a via the weak adhesive layer 4 (see FIG. 2). That is, in the present embodiment, the display screen 11a is heated not only by the heat generated by the heater 121 (see FIG. 2) of the holding member 12, but also by the heat generated by the film body 20. The heat generated from the heater 121 mainly warms the edge portion in the front view of the display screen 11a, and the heat generated from the film body 20 mainly warms the central portion in the front view of the display screen 11a. Therefore, the display screen 11a is warmed in the entire area of the front view without causing variation in heat transfer. At this time, the film body 2 and the heater 121 are formed so as to be electrically insulated. Therefore, when the holding member 12 is provided on the formation region of the film body 2, an adhesive layer made of a synthetic resin having electrical insulating properties at their interface (adhesion strength: greater than 5.0 N / 10 mm, 20 N / 10 mm). It is preferable to have the following) or to provide an insulating coating film on the surface of the film body 2 at least in the region where the holding member 12 is formed. When the adhesive layer made of synthetic resin is provided, it is preferable to contain the powder having high thermal conductivity (alumina, boron nitride, aluminum nitride, diamond, etc.) as described above. When providing an insulating coating film, it is preferable to form an alumina (Al ₂ O ₃ ) film by sputtering or the like.

When heat is generated by energizing the film body 20, in order to prevent a short circuit, the film body 20 is electrically insulated from the heater 121, and then the film body 20 is displayed on the display panel 11, especially the display screen. It is thermally connected to 11a (see FIG. 2 and the like). As described above, the film body 20 is thermally connected to the display panel 11 via the holding member 12, preferably an adhesive layer at the interface between the holding member 12 and the film body 2. The heaters 121, 121f1 and 121f2 shown in FIGS. 8A, 8B or 8C are not exposed from the surface of the holding member 12. Therefore, when the holding member 12 has high electrical insulation, the electrical insulation between the film body 20 and the heaters 121, 121f1, 121f2 can be performed exclusively by the holding member 12, so that the adhesive layer Does not require very high electrical insulation. On the other hand, the

heaters

121g and 121h shown in FIGS. 8D or 8E are exposed from the surface of the holding member 12. Therefore, the electrical insulation between the film body 20 and the

heaters

121g and 121h is performed exclusively by the adhesive layer. Therefore, in this case, a material having high electrical insulation is used for the adhesive layer.

[Membrane as a heating element]
FIG. 13A shows the film body 20 of the present embodiment provided on one surface 3a of the windshield 3. The film body 20 is a thin film body through which an electric current can flow, and is formed by, for example, sputtering or printing. As described above, the film body 20 can generate Joule heat to the extent that the display screen 11a can be heated by energization. That is, the film body 20 has an appropriate electric resistance Rg through which a current capable of heating the display screen 11a can flow. The heating by the film body 20 can play a role of reinforcing the heating by the heater 121. Therefore, the dew condensation on the display screen 11a can be eliminated in a shorter time by using the heating by the film body 20 and the heating by the heater 121 in combination. Further, especially when the windshield 3 is exposed to the cold air outside the automobile C, the heating by the film body 20 close to the windshield 3 is different from the heating by the heater 121 close to the display panel 11 from the display panel 11. The heat transfer to the windshield 3 is blocked. Therefore, the heating by the film body 20 enhances the effect of eliminating the dew condensation of the heating by the heater 121. Further, by adjusting the heating by the film body 20 and the heating by the heater 121, it may be possible to prevent the display panel 11 from becoming overheated. Therefore, deterioration of the display panel 11 can be suppressed.

As an example of an appropriate electric resistance Rg, the electric resistance Rg required when it is desired to raise the temperature of the display screen 11a by 10 ° C. within 1 minute is illustrated below. For example, when the specific heat capacity Cp of the display device 1 is 1.5 J / g · ° C., the calorific value Q of the film body 20 is required to be 400 J to 500 J. Therefore, 10Ω to 100Ω is exemplified as an appropriate electric resistance Rg when the voltage that can be supplied to the film body 20 is, for example, 12V to 24V.

Therefore, the film body 20 is formed by using a material capable of forming such an appropriate electric resistance Rg. Further, the material of the film body 20 is selected in consideration of the above-mentioned translucency and the goodness of film formation by sputtering or the like when forming the film body 20. Therefore, examples of the material of the film body 20 include ITO and zinc oxide, which have both relatively low conductivity suitable for heat generation and good light transmission. Further, when the film body 20 is formed thinner than the case where the film body 20 is formed by these inorganic compounds, a metal having higher conductivity such as titanium, chromium, rhodium, nickel or aluminum is used as the film body. It may be used as 20 materials. Therefore, the film body 20 can have, for example, an electric conductivity (conductivity) of 0.1 × 10 ⁶ S / m or more and 7 × 10 ⁷ S / m or less. Further, when the film body 20 is formed using ITO, zinc oxide or the like, the film body 20 may have a conductivity of 0.2 × 10 ⁶ S / m or more and 1 × 10 ⁶ S / m or less.

Metals such as titanium and chromium have reflection characteristics to infrared rays like compounds such as ITO and zinc oxide. Therefore, by forming the film body 20 using these compounds or metals, it is possible to prevent an unintended excessive temperature rise of the display device 1 due to irradiation with sunlight.

On the other hand, the thickness T that the film body 20 having a predetermined conductivity should have, the length L in the direction parallel to the current flow, and the length (width) W in the direction orthogonal to the current flow are respectively. They correlate with each other to have an appropriate electrical resistance Rg. Here, as described above, the film body 20 formed by sputtering or the like can be formed, for example, within a thickness range of 1 nm or more and 1000 nm or less. The film body 20 having such a thickness T has appropriate electrical resistance and mechanical strength, and may have higher transparency.

For example, when the film body 20 is formed by using a material having a conductivity of 0.2 × 10 ⁶ S / m or more and 1 × 10 ⁶ S / m or less, such as ITO or zinc oxide, the film body 20 is formed so as to have a thickness of, for example, 100 nm or more and 500 nm or less. In that case, the film body 20 may have a sheet resistance Rs (Rs = 1 / (conductivity of the film body 20 / thickness T of the film body 20) of 4 Ω / sq or more and 20 Ω / sq or less), for example. In the case of = 4Ω / sq, by setting the ratio (L / W) of the length L and the width W of the film body 20 to 2.5 or more and 25 or less, the above-mentioned appropriate electric resistance Rg: 10Ω to 100Ω. When Rs = 20Ω / sq, Rg: 10Ω to 100Ω can be obtained by setting L / W to 0.5 or more and 5 or less.

Further, when the film body 20 is formed by using a material having a conductivity of, for example, 2 × 10 ⁶ S / m or more and 7 × 10 ⁷ S / m or less, such as a metal, the film body 20 is, for example, a sheet. It is formed so as to have a thickness of 1 nm or more and 50 μm or less so that the resistance Rs (resistivity of the film body 20 / thickness T of the film body 20) is about 0.01 Ω / sq to 100 Ω / sq. At this time, if the film body 20 is formed so as to have a thickness of 2 nm or more and 14 nm or less, the film body 20 can obtain translucency. As an example, when the translucent film body 2 is formed by using nickel having a conductivity of about 14 × 10 ⁶ S / m, the film body 20 is about 5 Ω / sq or more and about 36 Ω / sq or less. Can have a sheet resistance Rs of. Here, by setting the ratio (L / W) of the length L and the width W of the film body 20 to 2 or more and 20 or less, the above-mentioned appropriate electric resistance Rg: 10Ω to 100Ω can be obtained. Further, when R = 36Ω / sq, Rg: 10Ω to 100Ω can be obtained by setting L / W to 0.28 or more and 2.8 or less. Further, when the film body 20 does not have translucency, for example, a film body 20 is formed by using a material having a sheet resistance of Rs = 0.01Ω / sq, and the length L and the width W of the film body 20 are formed. By setting the ratio (L / W) of the above to 1000 or more and 10000 or less, the above-mentioned appropriate electric resistance Rg: 10Ω to 100Ω can be obtained. Further, when the film body 20 is formed by using a material having a sheet resistance of Rs = 100Ω / sq, the ratio (L / W) of the length L and the width W of the film body 20 is set to 1. As a result, the above-mentioned appropriate electric resistance Rg: 100Ω can be obtained.

In the example of FIG. 13A, the film body 20 has a rectangular front shape substantially similar to the front shape of the display device 1 indicated by the two-point chain line, as in the first embodiment, and is viewed from the front of the display device 1. Although it is formed so as to have an area smaller than the area of the display device 1, it may have an area larger than that of the display device 1 such as the film body 20a drawn by a two-point chain line on the outside of the display device 1. .. The film body 20, which can be formed of ITO, Ti, or the like, may have a higher thermal conductivity than the windshield 3. Therefore, as in the first embodiment, heating of the display screen 11a may be promoted by heating using a heat source such as a defroster (see FIGS. 11A and 11B).

As shown in FIG. 13A, each of the two opposing short sides of the film body 20 having a rectangular front shape overlaps with the electrode 21. An electric current is passed through the film body 20 through the electrode 21. The electrode 21 is preferably made of a material having higher conductivity than the material forming the film body 20. For example, when the film body 20 is formed by using ITO, the electrode 21 is composed of a conductor film containing aluminum, nickel, or the like. By forming the electrode 21 as shown in FIG. 13A, the uniformity of the current density in the short side direction of the current flowing in the long side direction of the film body 20 can be improved. That is, the variation in the amount of heat generated in the film body 20 can be reduced.

The electrode 21 may be connected to a power supply path 23a (see FIG. 6B) that supplies electric power to the heater 121 at any portion thereof, or may be integrally formed with the power supply path 23a. Further, the electrode 21 may be connected to a separate power supply path that exclusively supplies electric power to the film body 20, or may be integrally formed with the power supply path. Further, the electrode 21 does not necessarily have to be along the short side of the film body 20 as shown in FIG. 13A, and may be formed so as to overlap the long side along the long side of the film body 20. Further, the electrode 21 does not have to be in contact with one side of the film body 20 over the entire length of one side, and may be in contact with the film body 20 at one or more arbitrary positions on each side of the film body 20.

When each of the two electrodes 21 is arranged as in the example of FIG. 13A, the feeding path to the film body 20 may be short and difficult to be noticed. However, when the electrodes 21 are provided on the two opposite sides of the film body 20, they may be formed as in the example of FIG. 13B. That is, two

electrodes

21a and 21b may be formed so that a current easily flows from an arbitrary internal angle 22a of the film body 20 toward the internal angle 22b which is the diagonal of the internal angle 22a. It is presumed that by forming the

electrodes

21a and 21b as shown in FIG. 13B, heat can be generated in the film body 20 more uniformly than in the example of FIG. 13A.

Other examples of the membrane 20 will be described with reference to FIGS. 13C-13F. Note that in FIGS. 13C to 13F, the electrodes 21 shown in FIGS. 13A and 13B are omitted.

The membrane body 20c of another example shown in FIG. 13C includes two regions 20c1 and 20c2 electrically separated from each other. That is, the film body 20c of FIG. 13C includes a region 20c1 and a region 20c2 that are separated from each other, and power is supplied to the regions 20c1 and 20c2 from different power sources. As shown in FIG. 13C, the membrane 20c, which is a heating element, is separated into a plurality of regions having an area smaller than that of the membrane 20 (see FIG. 13A), so that the membrane is compared with the examples of FIGS. 13A and 13B. It may increase the uniformity of the distribution of the calorific value throughout the body 20c. The film body 20c is not limited to the example of FIG. 13C, and may include a plurality of regions more than 2. For example, the film body 20c may include a plurality of regions separated in a grid pattern.

The film body 20d of another example shown in FIG. 13D has a front shape that meanders in a zigzag manner. That is, the film body 20d defines the current path from the current inflow point Ps to the current outflow point Pd by its own shape, and the current path meanders in a zigzag manner. By forming the film body 20d as shown in FIG. 13D, the ratio (L / W) of the length L and the width W in the film body 20 described above can be increased (see FIG. 13A). That is, even when a material having a high conductivity (low resistivity) such as metal is used, the film body 20d having an appropriate electrical resistance can be formed within a predetermined area.

FIG. 13E shows a film body 20e which is a modification of the film body 20d of FIG. 13D. The film body 20e includes a meandering shape similar to the film body 20d of FIG. 13D. The film body 20e is electrically separated into four regions including a meandering shape, and electric power is supplied to each region. Therefore, as in the example of FIG. 13D, an appropriate electric resistance can be provided within a predetermined area, and the uniformity of the heat generation amount distribution in the entire film body 20e may be improved.

The film body 20f of another example shown in FIG. 13F is formed in a solid shape, that is, substantially the entire surface of the region X2 that can be occupied by the film body 20, like the film body 20 shown in FIGS. 13A and 13B. There is. However, the film body 20f is provided with a separating portion 20f1 that partially divides the film body 20f. By providing the separating portion 20f1, similarly to the notch portion 2a1 shown in FIG. 10B of the first embodiment, the difference in the coefficient of thermal expansion between the film body 20f and the object such as the windshield 3 (see FIGS. 1 and 2) It may be possible to relieve the stress that can occur. In the example of FIG. 13F, six separating portions 20f1 having a rectangular front shape are provided. However, an arbitrary number of separation portions, each having an arbitrary shape, may be provided on the film body 20f.

By providing the separating portion 20f1, the current flowing through the film body 20f is divided like, for example, the current I1 and the current I2. Therefore, the separation portion 20f1 is preferably provided so as to obtain a branch flow path having an appropriate width and length in which the current flowing through the film body 20f can be appropriately diverted. By appropriately providing the separating portion 20f1 in this way, it is possible to obtain a heat generation distribution with good uniformity in the film body 20f.

Even if the separation portion 20f1 as in the example of FIG. 13F is not provided, by using a material having a coefficient of thermal expansion close to the coefficient of thermal expansion of one surface 3a to which the display device 1 is attached, the film body 20 can be used. The stress generated between the 20 and the surface 3a can be reduced. When the film body 20 is provided on the windshield 3, for example, Kovar and Invar having a coefficient of thermal expansion close to that of glass are suitable as materials for the

film bodies

20, 20a to 20f.

Similar to the formation of the heater 121, it is preferable to use a thermal simulation for forming the film body 20 having an appropriate shape so as to heat the display screen 11a as uniformly as possible. By doing so, it is possible to prevent a decrease in local display characteristics and life due to uneven heating of the display screen 11a.

[Control of energization to the membrane body]
FIG. 14 shows a block diagram of the main elements involved in controlling the energization of the membrane 20. As shown in FIG. 13, in the mounting structure of the display device of the present embodiment, the film body 20 is connected in parallel to the power supply E of the mounting structure of the first embodiment (see FIG. 9). Specifically, the film body 20 is connected to the power supply E via the switching element 26. Like the switching element 126, the switching element 26 has an input terminal for a signal that controls the open / closed state of the switching element 26, and the output of the control unit 111 is input to this input terminal. Examples of the switching element 26 include semiconductor elements such as various transistors, switching ICs, electromagnetic relays, and the like, similarly to the switching element 126. In the example of FIG. 14, the first and

second control units

111a and 111b start or stop energization of the film body 20 by switching between the open state and the closed state of the switching element 26, and energize the film body 20. Switch between the non-energized state and the non-energized state.

For example, the first and

second control units

111a and 111b may start or stop the energization of the film body 20 in conjunction with the energization of the heater 121. Further, the first and

second control units

111a and 111b may start or stop the energization of the film body 20 independently of the energization of the heater 121. For example, the first and

second control units

111a and 111b start energizing the film body 20 close to the windshield 3 before starting the energization of the heater 121 away from the windshield 3. By doing so, when the windshield 3 is exposed to the cold air outside the automobile C, the display device 1 is prevented from being cooled via the holding member 12. Further, for example, after stopping the energization of the heater 121, the energization of the film body 20 is started, and the energization of the heater 121 near the display panel 11 and the energization of the film body 20 away from the display panel 11 are alternately performed. Start and stop. By doing so, the display panel 11 is prevented from being overheated due to continuous heating by the heater 121. When the display panel 11 is an organic EL display device having relatively low heat resistance, such an overheat prevention function is particularly useful because an excessive temperature rise in eliminating dew condensation promotes a decrease in display characteristics and life. is there.

In this embodiment as well, as in the first embodiment, for example, even if a booster circuit VB such as a booster DC / DC converter that raises the voltage of the power source E is provided between the power source E and the film body 20. Good. By doing so, the value of the current flowing through the film body 20 can be reduced, and the usable range of the electrical resistance of the film body 20 can be expanded. In the example of FIG. 14, the booster circuit VB is provided between the power source E and the film body 20 and the heater 121, but is between the power source E and the film body 20 and between the power source E and the heater 121. It may be provided individually, or may be provided between the power source E and the film body 20 and between the power source E and the heater 121. Especially when the voltage applied to the film body 20 due to the introduction of the booster circuit VB is relatively high (for example, 25 V or more), the power supply path to the film body 20 (for example, the power supply path 23a in FIG. 6B) is covered with an insulating material. Covering with a film 25 (see FIG. 6B) is preferable in order to prevent a short circuit due to dust, dust, etc., or an unexpected electric shock.

The booster circuit VB may be used to increase the amount of heat generated by the film body 20 per unit time. By doing so, it is possible to shorten the time required to bring a predetermined temperature rise to the display device 1. For example, by using a booster circuit that doubles the voltage without changing the electrical resistance of the film body 20, the time required to obtain a predetermined temperature rise can be reduced to 1/4.

(Summary)
In the display device according to the first aspect of the present disclosure, a display panel having a first surface including a display screen composed of a plurality of pixels and a second surface opposite to the first surface, and the display panel are attached. A holding member provided at least at the edge of the display panel to hold the display panel on a predetermined flat surface or curved surface to be formed, the holding member includes a heater that generates heat to heat the display screen. It is characterized by being.

According to the configuration of the first aspect of the present disclosure, since the display screen is warmed by the heat generated from the heater, the temperature around the display device is low, and therefore even when the saturated water vapor amount is small, dew condensation that tends to occur on the display screen is prevented. can do. This makes it possible to easily prevent or eliminate the deterioration of the visibility of the displayed image due to the change in the surrounding environment.

In the display device according to the second aspect of the present disclosure, in the first aspect, the heater is preferably made of a linear material or a plate-like material that generates heat when energized.

According to the configuration of the second aspect of the present disclosure, the heater can be provided inside the holding member in a space-saving manner, so that the heater can be easily arranged over the entire holding member.

In the display device according to the third aspect of the present disclosure, in the first or second aspect, it is preferable that the holding member includes a plurality of the heaters provided in individual regions of the holding member.

According to the configuration of the third aspect of the present disclosure, the uniformity of the heat generation amount distribution in the entire holding member is enhanced. Therefore, dew condensation is uniformly prevented over the entire display screen.

In the display device according to the fourth aspect of the present disclosure, in any one of the first to third aspects, the holding member has a first portion of the display panel facing the first surface and the display. The heater is preferably provided on either or both of the first portion and the second portion, including a second portion of the edge of the panel facing the second surface.

According to the configuration of the fourth aspect of the present disclosure, if the heater is provided in the first portion, the position of the heater is close to the display screen to be heated, so that the display screen can be efficiently heated. Further, if the heater is provided in the second part, the position of the heater is close to the windshield. Therefore, when the temperature of the windshield is relatively low, the windshield is heated by the heat of the heater, so that the temperature is increased. It is possible to prevent the temperature of the display panel from dropping due to heat transfer from the display panel having a high temperature to the windshield having a low temperature.

In the display device according to the fifth aspect of the present disclosure, in any one of the first to fourth aspects, the holding member has a bottom surface facing the second surface of the display panel, and is placed on the bottom surface. It is preferable that a heat conductive film having a higher thermal conductivity than the material constituting the second surface is formed.

According to the configuration of the fifth aspect of the present disclosure, the heat generated from the heater is easily conducted to the back surface of the display panel, so that the efficiency of heating the display screen is improved.

In the display device according to the sixth aspect of the present disclosure, in any one of the above aspects 1 to 5, the temperature measuring unit that monitors the temperature of the display screen and the heater are energized based on the output of the temperature measuring unit. It is preferable to further include a first control unit for controlling the above.

According to the configuration of aspect 6 of the present disclosure, unnecessary use of the heater can be avoided, and the display device can be prevented from becoming overheated.

In the display device according to the seventh aspect of the present disclosure, in any one of the above aspects 1 to 6, a timekeeping unit for monitoring the arrival of a preset time and energization of the heater based on the output of the timekeeping unit. It is preferable to further include a second control unit for controlling the above.

According to the configuration of aspect 7 of the present disclosure, unnecessary use of the heater can be avoided, and waste of electric power can be prevented.

In the display device according to the eighth aspect of the present disclosure, it is preferable that the display panel and the heater share a power source in any one of the above aspects 1 to 7.

According to the configuration of aspect 8 of the present disclosure, a power supply for each of the display panel and the heater becomes unnecessary.

In the display device according to the ninth aspect of the present disclosure, in any one of the above aspects 1 to 8, it is preferable that the holding member includes a conductive path for transmitting a signal input to the display panel.

According to the configuration of aspect 9 of the present disclosure, a signal input to the display panel can be supplied via the holding member.

The mounting structure of the display device according to the tenth aspect of the present disclosure includes the display device of any one of the above aspects 1 to 9 and a film body provided on one surface composed of a predetermined flat surface or curved surface facing the interior of the vehicle. The film body has a higher thermal conductivity than the material constituting the second surface of the display panel, and the display device directs the display screen into the room and the heater. It is characterized in that it is attached to the one surface via the film body in order to receive heat emitted from the film body and conducted through the film body.

According to the configuration of the tenth aspect of the present disclosure, the heat generated from the heater is diffused in the film body having a higher thermal conductivity than the material constituting the second surface of the display panel, so that the heat is transmitted to the entire display screen. The uniformity of heat distribution can be improved.

In the mounting structure of the display device according to the eleventh aspect of the present disclosure, in the tenth aspect, the film body is formed of a material capable of passing an electric current, and heat that warms the display screen when energized. It is preferable to generate.

According to the configuration of aspect 11 of the present disclosure, the film body also generates heat, so that the uniformity of the heat transfer distribution over the entire display screen can be further enhanced.

In the mounting structure of the display device according to the twelfth aspect of the present disclosure, in the eleventh aspect, the voltage boosting that increases the voltage applied to at least one of the heater and the film body so as to pass a current through at least one of the heater and the film body. It is preferable to further include a circuit.

According to the configuration of the aspect 12 of the present disclosure, the value of the current flowing through the heater or the film body can be reduced, and the usable range of the electric resistance of the heater or the film body can be expanded. When the booster circuit is used to increase the heat generation amount of the heater or the film body per unit time, the time for bringing a predetermined temperature rise to the display device can be shortened.

In the mounting structure of the display device according to the thirteenth aspect of the present disclosure, in the

above aspect

11 or 12, the insulating property covering the power supply path formed on one surface as the power supply path to at least one of the heater and the film body. It is preferable to further provide a coating film of.

According to the configuration of aspect 13 of the present disclosure, it is possible to prevent a short circuit due to dust, dust, etc., or an unexpected electric shock, particularly when the voltage applied to the heater or the film body is relatively high.

In the display device mounting structure according to aspect 14 of the present disclosure, in any of the above aspects 11 to 13, the film body is electrically insulated from the heater and thermally connected to the display panel. Is preferable.

According to the configuration of aspect 14 of the present disclosure, the display screen of the display panel can be reliably warmed while preventing a short circuit or electric shock.

In the mounting structure of the display device according to the 15th aspect of the present disclosure, it is preferable that the film body and the display panel are formed of a translucent material in any of the 10th to 14th aspects.

According to the configuration of aspect 15 of the present disclosure, the front view can be seen through the display device when the image is not displayed on the display device.

In the mounting structure of the display device according to the 16th aspect of the present disclosure, in any one of the 10th to 15th aspects, it is preferable that the film body is provided with a separating portion for partially dividing the film body. ..

According to the configuration of aspect 16 of the present disclosure, the stress that can be generated due to the difference in the coefficient of thermal expansion between the mounting surface of the display device and the film body is relaxed. Further, when the film body is energized, a heat generation distribution with good uniformity can be obtained in the film body.

In the mounting structure of the display device according to the 17th aspect of the present disclosure, it is preferable that the holding member has a windshield that prevents the wind hitting the display screen in any one of the 10th to 16th aspects.

According to the configuration of aspect 17 of the present disclosure, since the wind that hits the display screen is prevented by the windshield, deterioration of the display device due to the wind is suppressed. In addition, peeling from the mounting surface of the display device due to exposure to warm air is prevented.

In the mounting structure of the display device according to the 18th aspect of the present disclosure, in any one of the 10th to 17th aspects, the film body has an exposed portion not covered by the display device, and the display device has an exposed portion. It is preferable to further have a wind guide body extending to the exposed portion so as to direct the wind hitting the exposed portion to the exposed portion.

According to the configuration of the aspect 18 of the present disclosure, the heating of the display device is promoted by hitting the exposed portion with warm air.

1, 1a to 1d, 1x Display device 11 Display panel 11a Display screen 11f Front (first surface)
11r back (second side)
111a 1st control unit 111b 2nd control unit 112 Temperature measuring unit 113

Time measuring unit

12, 12a to 12h Holding member 12R1 1st part 12R2 2nd part 12R21 Bottom 12R21a Bottom 121, 121a1 to 121a3, 121b1 to 121b3, 121c1 to 121c6, 121d1 to 121d4, 121e1, 121e2, 121f to 121h Heater 122 Conductive path 123 Thermal conductive film 127

Windshield

2, 2a, 2b, 2x, 20, 20a to 20f, 20a1, 20a2, 20x Membrane 2b1 Exposed part 20f1 Separation part 25 Cover Cover film 3a One-sided VB booster circuit

Claims

A display panel having a first surface including a display screen composed of a plurality of pixels and a second surface opposite to the first surface, and
A holding member provided at least at the edge of the display panel to hold the display panel on a predetermined flat surface or curved surface to which the display panel should be attached.
With
The holding member is a display device including a heater that generates heat for heating the display screen.
The display device according to claim 1, wherein the heater is composed of a linear material or a plate-like material that generates heat when energized.
The display device according to claim 1 or 2, wherein the holding member includes a plurality of the heaters provided in individual regions of the holding member.
The holding member includes a first portion of the display panel facing the first surface at the edge portion and a second portion of the display panel at the edge portion facing the second surface.
The display device according to any one of claims 1 to 3, wherein the heater is provided in either or both of the first portion and the second portion.
The holding member has a bottom surface facing the second surface of the display panel.
The display device according to any one of claims 1 to 4, wherein a heat conductive film having a higher thermal conductivity than the material constituting the second surface is formed on the bottom surface.
A temperature measuring unit that monitors the temperature of the display screen and
The display device according to any one of claims 1 to 5, further comprising a first control unit that controls energization of the heater based on the output of the temperature measuring unit.
A timekeeping unit that monitors the arrival of a preset time,
The display device according to any one of claims 1 to 6, further comprising a second control unit that controls energization of the heater based on the output of the timekeeping unit.
The display device according to any one of claims 1 to 7, wherein the display panel and the heater share a power source.
The display device according to any one of claims 1 to 8, wherein the holding member includes a conductive path for transmitting a signal input to the display panel.
The display device according to any one of claims 1 to 9,
A film body provided on one surface consisting of a predetermined flat surface or curved surface facing the interior of the vehicle,
Including
The film body has a higher thermal conductivity than the material constituting the second surface of the display panel.
The display device is attached to one surface of the display device so as to direct the display screen into the room and receive heat emitted from the heater and conducted through the film body via the film body. Construction.
The mounting structure of the display device according to claim 10, wherein the film body is formed of a material capable of passing an electric current, and generates heat for warming the display screen when energized.
The mounting structure of the display device according to claim 11, further comprising a booster circuit for increasing the voltage applied to at least one of the heater and the film body so that a current flows through at least one of the heater and the film body.
The mounting structure of the display device according to claim 11 or 12, further comprising an insulating coating film covering the power supply path formed on one surface as a power supply path to at least one of the heater and the film body.
The display device mounting structure according to any one of claims 11 to 13, wherein the film body is electrically insulated from the heater and thermally connected to the display panel.
The mounting structure of the display device according to any one of claims 10 to 14, wherein the film body and the display panel are formed of a material having translucency.
The mounting structure of the display device according to any one of claims 10 to 15, wherein the film body is provided with a separating portion for partially dividing the film body.
The mounting structure of the display device according to any one of claims 10 to 16, wherein the holding member has a windshield that prevents wind from hitting the display screen.
The film body has an exposed portion that is not covered by the display device.
The mounting structure of the display device according to any one of claims 10 to 17, further comprising a wind guide extending to the exposed portion so as to direct the wind hitting the display device to the exposed portion.