JP5941766B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  As a conventional display device for a vehicle, there is known a display device that guides the user to the inside or outside of the vehicle when the door is opened and closed in order to smoothly get on and off the vehicle at night in and out of the vehicle interior.

For example, the lighting function is given to the kicking plate provided as a protective member on the side sill provided at the opening edge of the side door of the vehicle body, and the movement of the user at night or in a dark place is facilitated by notifying the user of the getting-on / off position Can be.
Patent Document 1 describes a configuration in which a plurality of LEDs are capable of independently changing light emission states having different emission colors based on a control program stored in advance by a control circuit electrically connected thereto. Has been.
Patent Document 2 suggests the direction of movement of the user who gets on and off due to changes in the display state, such as the luminance increase and decrease of the LED of the guidance display unit provided on the floor in the vehicle, and the change of the emission color. The structure which can be guided so that it can move to an entrance / exit is described.
Patent Document 3 describes a configuration in which the light source blinks or changes color for a certain time and then switches to a normal lighting state by interlocking the door opening / closing operation with the light source on / off and opening the door. Has been.

JP 2011-116315 A JP 2011-093469 A JP 2005-238859 A

  However, in the conventional configuration, it is necessary to arrange LEDs having different colors for multicolor expression. Furthermore, it is necessary to create a control program for controlling the emission color of each LED and secure a space for arranging the control circuit. In this case, since the emission color changes only in the pattern determined by the control program, the expression becomes a single one.

  In addition, since the colors that can be expressed depend on the light emission color of the light source, it is necessary to increase the number of light sources in order to express multiple colors, and an additional space for that is required. For this reason, when many such light sources and control circuits are incorporated in the kicking plate installed in the side step portion of the vehicle, the thickness may increase and the aesthetic appearance may be affected. In addition, there is a problem that it becomes difficult to incorporate into the kicking plate due to the problem of the arrangement space.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and one of the objects is to provide a display device that enables multicolor expression at low cost and space saving, and is more excellent in display responsiveness. It is said.

  The display device according to the present invention includes a heat source, a heat conduction unit that transmits heat from the heat source, a temperature indicating member that changes color depending on the temperature transmitted from the heat conduction unit, and an outer case that covers the temperature indicating member. And a light-transmitting member that sandwiches the heat source, the heat conducting unit, and the temperature indicating member with the outer case, and the heat conducting unit is configured to absorb air heated by heat generated from the heat source. It has the space part to circulate, It is characterized by the above-mentioned.

  According to this, multicolor and various displays can be easily realized by using the temperature indicating member that changes color depending on the temperature. Further, it is not necessary to prepare a plurality of LEDs having different emission colors for multi-color expression as in the prior art. In addition, since it is not necessary to control these in a complicated manner, it is possible to perform multi-color expression with a simpler configuration than before and to reduce costs. Further, the heat conduction speed can be accelerated by circulating the heat generated from the heat source (air heated by the heat source) through the space of the heat conduction unit. Thereby, it is possible to quickly and uniformly heat the entire temperature indicating member while suppressing unevenness in temperature rise due to the region of the heat conducting portion. As a result, the display device is excellent in display response.

Moreover, it is good also as a structure by which the said space part is formed in the concave shape which forms a clearance gap between adjacent members.
According to this, by making the shape of the space portion concave so as to form a gap between the adjacent members, a space is automatically formed between the heat conducting portion and the adjacent member if the constituent member is accommodated in the outer case. Will be. Thereby, the air heated by the heat source flows in the space portion, and the temperature of the entire heat conducting portion can be increased uniformly. The concave space can be easily processed and manufactured in a short time.

Moreover, it is good also as a structure which the said space part is extended in the direction away from the said heat source from the position near the said heat source.
According to this, heat can be quickly and reliably transmitted to a region far from the heat source, and the temperature of the entire temperature indicating member can be increased uniformly.

Moreover, it is good also as a structure made into the shape which becomes narrow as the width | variety of the said heat conductive part leaves | separates from the said heat source.
According to this, since the velocity of the air flow increases toward a narrow space, the heat conduction speed is accelerated in the direction of narrowing the width, and the heat conduction efficiency can be improved.

Moreover, it is good also as a structure by which the said heat source is opposingly arranged by the longitudinal direction both sides of the said heat conduction part.
According to this, since heat is applied from both sides in the longitudinal direction of the heat conducting portion, a larger amount of heat is supplied to the temperature indicating member through the heat conducting portion than when a heat source is disposed only on one side. In addition, by disposing the heat source oppositely to the opening of the space portion extending in the longitudinal direction of the heat conducting portion, the air heated by the heat source flows in the space portion to eliminate temperature unevenness in the longitudinal direction of the heat conducting portion. be able to.
Thereby, the temperature of the whole heat conduction part can be raised quickly and uniformly, and as a result, the temperature rise of the temperature indicating member is promoted, so that a display with good responsiveness can be performed.

Moreover, it is good also as a structure by which the said heat source is arrange | positioned in the said space part of the said heat conduction part.
According to this, the transmission efficiency of the heat transmitted through the space portion can be improved, and the entire heat conducting portion and thus the entire temperature indicating member can be heated in a shorter time.

It is good also as a structure which has several said space parts and at least one part of each space part is mutually connected.
According to this, the circulation efficiency of the heat (air heated by the heat source) transmitted through each space portion is improved.

The heat source may be a light source.
According to this, a heat source can be comprised using the conventional light source.

Moreover, it is good also as a structure used for the kicking plate installed in the side step part of a motor vehicle.
According to this, since low cost and space saving can be realized, even when incorporated in a vehicle, a multicolor and various displays can be performed without impairing the aesthetic appearance. In addition, since it has excellent display responsiveness, it is possible to provide a kicking plate with further improved merchantability.

  According to the present invention, it is possible to realize a display device that enables multicolor expression with low cost and space saving, and more excellent display responsiveness.

The schematic perspective view which shows the position of the kicking plate when the door of a vehicle is open. The top view which shows schematic structure of the display apparatus in 1st Embodiment. Sectional drawing which follows the AA line of FIG. Sectional drawing which follows the BB line of FIG. It is a figure which shows schematic structure of a heat conductive member, Comprising: (a) is a top view, (b) is sectional drawing. (A), (b) is sectional drawing which shows the other shape of the space part in a heat conductive member. Sectional drawing which shows the modification of 1st Embodiment. Sectional drawing which shows schematic structure of the display apparatus of 2nd Embodiment. It is a figure which shows schematic structure of the heat conductive member in 2nd Embodiment, Comprising: (a) is a top view, (b) is sectional drawing. The figure which shows the other example in 2nd Embodiment. The figure which shows the other example in 2nd Embodiment. The top view which shows schematic structure of the display apparatus of 3rd Embodiment. The figure which shows the conduction state of the heat in the heat conductive member of 3rd Embodiment. It is a figure which shows the modification of a heat conductive member, Comprising: (a) is a top view, (b) is the end elevation seen from the arrow D side of (a).

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

(First embodiment)
First, the configuration of the first embodiment of the display device according to the present invention will be described.
FIG. 1 is a schematic perspective view showing the position of the kicking plate when the vehicle door is open.
As shown in FIG. 1, door openings 3 a serving as user entrances are provided on both side surfaces of the vehicle 2, and are opened and closed by the doors 3. Seats 6 are respectively arranged on the floor surface 7 in the vehicle interior corresponding to each door 3. An instrument panel 5 is disposed in front of the driver's seat 6. A brake pedal 8A and an accelerator pedal 8B are provided on the floor surface 7 in front of the driver's seat 6 and below the instrument panel 5.

  A side step portion 11 serving as a vehicle outer body panel extends along the front-rear direction of the vehicle 2 at the lower edge portion of the door opening 3a. A kicking plate 9 extending in the vehicle front-rear direction is fixed to the upper surface 11 a of the side step portion 11. An inner sill cover 4 arranged in parallel to the kicking plate 9 is fixed at a position immediately inside the vehicle interior of the kicking plate 9. The inner sill cover 4 is installed at a position higher than the kicking plate 9. A display device 10 as shown in FIG. 2 is incorporated in the kicking plate 9 of this embodiment.

  2 is a plan view showing a schematic configuration of the display device according to the present embodiment, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. FIG. 5 is a diagram showing a schematic configuration of the heat conducting member, where (a) is a plan view and (b) is a cross-sectional view.

  As shown in FIGS. 2 and 3, the display device 10 includes a heat source part (heat source) 13 having a plurality of light sources 12, a heat conduction member (heat conduction part) 14 disposed in the vicinity of the heat source part 13, The temperature indicating member 15 disposed adjacent to the conductive member 14, the mask member 16 disposed on the temperature indicating member 15, the light transmissive member 17 provided so as to cover the mask member 16, and the light The unit structure includes an outer case 18 that is fitted to the permeable member 17.

  The pair of heat source portions 13 are disposed on both sides in the longitudinal direction so as to sandwich the heat conducting member 14, and are disposed in the housing recess 18 </ b> A of the outer case 18 together with the substrate 19. The heat source parts 13 oriented through the heat conducting member 14 are arranged so that the optical axes of the light sources 12 coincide with each other in the width direction (short direction of the heat conducting member 14). In the present embodiment, a monochromatic LED is used as the light source 12 and is provided on a substrate 19 on which wiring for supplying power to the light source 12 is routed. The amount of heat generated in the heat source unit 13 can be adjusted by the number of light sources 12 and the like.

  The heat conducting member 14 transmits heat radiated from the light source 12 to the temperature indicating member 15 and is made of a material having a heat conducting element such as a metal such as copper or iron. In addition to metal, a carbon material such as ceramic or carbon may be used.

  As shown in FIGS. 4 and 5A, 5B, the heat conducting member 14 in the present embodiment has a plurality of space portions 14A that are recessed in the thickness direction on one surface side thereof. By making the shape of the space portion 14A concave, if the heat conducting member 14 is accommodated in the outer case 18, a space is formed between other adjacent members and a space in which air flows is formed.

  A plurality of these space portions 14 </ b> A extend in the longitudinal direction of the heat conducting member 14 and are provided at predetermined intervals in the lateral direction. That is, each space portion 14 </ b> A is formed to extend in a direction away from a position close to the heat source portion 13. As a result, the air around the heat source heated by the heat source unit 13 is efficiently guided to a region away from the heat source unit 13 through each space 14A.

  Specifically, the space portion 14 </ b> A has a groove shape that opens toward the light source 12, and both end sides of each space portion 14 </ b> A close to the heat source portion 13 communicate with each other. By disposing the light source 12 so as to face each space portion 14A or at least the communication portion 14a, more air heated by the light source 12 can be taken into the space portion 14A. In the present embodiment, the space portion 14 </ b> A functions to quickly and uniformly flow the surrounding air heated by the light source 12 generating heat over the entire area of the heat conducting member 14. Therefore, the circulation of the air flowing in the space portion 14A can be promoted by providing at least a part of the plurality of space portions 14A in communication with each other.

  As described above, the air heated by the heat generated by the light emission of the light source 12 flows in the space 14A, so that the temperature of the entire heat conducting member 14 rises uniformly without any unevenness. That is, providing the space 14 </ b> A in the heat conducting member 14 greatly contributes to increasing the temperature rise efficiency of the temperature indicating member 15. In addition, the structure of 14 A of space parts should just be a shape by which the flow of warm air is accelerated | stimulated. In addition, the concave shape and the groove shape facilitate processing and can be manufactured in a short time.

Further, as described above, since the heat conducting member 14 is made of a material having a heat conducting element, it is preferable to arrange a part of the heat conducting member 14 so as to contact the heat source unit 13. Thereby, the heat of the heat source unit 13 is directly transmitted from the contact portion to the heat conducting member 14, and the heat generated by the light emission of each light source 12 can be more effectively dissipated to the temperature indicating member 15.
Such a heat conducting member 14 is disposed in a housing recess 18 </ b> B extending in the longitudinal direction of the outer case 18 with the one surface side on which the space portion 14 </ b> A is formed facing away from the outer case 18. .

FIGS. 6A and 6B are cross-sectional views showing other shapes of the space portion 14A in the heat conducting member 14.
In the present embodiment, the cross section of the space portion 14A has a quadrangular shape, but may be a semicircular shape or a triangular shape as shown in FIGS. There is no particular limitation.

  The temperature indicating member 15 is disposed on the surface where the space portion 14 </ b> A of the heat conducting member 14 is formed, and changes its color depending on the temperature transmitted from the heat conducting member 14. The temperature indicating member 15 is made of a temperature detection material whose color changes stepwise depending on temperature characteristics. Specifically, the temperature indicating member 15 changes color when a predetermined temperature is reached, and then returns to the original color when the temperature decreases. There are types and irreversible types that do not return to their original colors. In this embodiment, a reversible material is used.

  The characteristics of reversible temperature indicating inks in practical use include light-resistant metal complex salt inks, liquid crystal inks with good color change accuracy, dye-type inks with excellent vivid colors, number of colors, and color change temperature selectivity. The principle of discoloration is pyrolysis (eg, metal salt), crystal transition (eg, metal complex), change in molecular orientation (eg, crystal), electron transfer between different molecules (eg, lactone type, lactam type, etc.) Related to the electronic transfer between and phenol compounds.

  As the temperature indicating ink used in the present embodiment, it is necessary to use an ink that changes color clearly and sensitively to a temperature change, and the temperature indicating temperature to be changed in advance is also considered in consideration of the amount of heat generated in the heat source unit 13. Determine and select a temperature indicating material suitable for that temperature.

  Note that the size of the temperature indicating member 15 is not limited to that shown in FIG. 3, and may be formed to have substantially the same shape as the heat conducting member 14.

  The mask member 16 has regions having different color transmission characteristics, and is disposed on the surface of the temperature indicating member 15. Here, a plurality of openings 16A that partially expose the temperature indicating member 15 are provided (FIG. 2), and arbitrary display contents can be expressed to the user by the shape of each opening 16A. The shape of the opening 16A can be applied to various shapes such as a character imitation or a pattern. Such a mask member 16 can be formed by printing, coating, painting, or the like using, for example, black ink.

  In this embodiment, since the light source 12 is used as a heat source for the temperature indicating member 15, the light source 12 transmits light from the light source 12 by covering the heat source portion 13 with the mask member 16 as shown in FIG. 3. Light leaking through the member 17 can be shielded. Here, it is not necessary to cover the light source body 12A, and it is sufficient that at least the light emitting part 12B is covered.

  The light transmissive member 17 is disposed on the surface of the mask member 16 and is fitted to the outer case 18. By fitting into the outer case 18, the heat source unit 13, the heat conducting member 14, the temperature indicating member 15, the mask member 16, and the like are held between the outer case 18 and the outer case 18. Specifically, the light transmissive member 17 is attached in a state in which the fitting convex portion 117 provided on the peripheral edge portion is engaged with the fitting concave portion 118 on the outer case 18 side. For this reason, it is possible to replace the mask member 16 having a different shape of the opening 16A, and it is also possible to have specifications with different display contents. The light transmissive member 17 is made of an acrylic plate or a transparent ABS resin.

  The outer case 18 is formed of a copolymer synthetic resin such as ABS resin, a thermoplastic resin such as PP, or the like.

  In the display device 10 configured as described above, when the light sources 12 provided in the heat source units 13 are simultaneously turned on, the heat conducting member 14 is heated by the heat generated by the light emission. After the heat of the heat source unit 13 is transmitted to the heat conducting member 14, the heat is transported through the heat conducting member 14 and transmitted to the temperature indicating member 15. The temperature indicating member 15 changes color according to the temperature transmitted from the heat conducting member 14. A predetermined character or pattern is displayed through the mask member 16 when the temperature indicating member 15 changes color.

  As described above, the heat conducting member 14 of the present embodiment is provided with a plurality of space portions 14A. Due to the heat generated by the light emission of the heat source unit 13, the temperature of the surrounding air rises and a temperature with the air in the space 14A is generated. Due to this temperature difference, air flows due to air expansion and convection, and the air in the space 14A is replaced with warm air. While the light source 12 is lit, the low-temperature air is warmed by the heat source unit 13 so that air circulation is continued. In this way, the air around the heat source 13 heated by the heat source 13 flows in the space 14A. By guiding the warm air to the region away from the heat source 13 by such a space portion 14A, the temperature of the entire heat conducting member 14 increases uniformly.

  As described above, in the display device 10 according to the present embodiment, the color of the temperature indicating member 15 whose color changes depending on the temperature is changed using the heat emitted from the heat source unit 13, so that the external temperature can be obtained through the opening 16 </ b> A of the mask member 16. Therefore, the color of the temperature indicating member 15 can be visually observed. By changing the color of the temperature indicating member 15 using the heat source unit 13, it becomes possible to easily express multiple colors.

  By using the temperature indicating member 15 that changes color according to the temperature as in the present embodiment, the display color does not depend on the light emission color of the light source 12, and several LEDs are used for multi-color correspondence as in the past. There is no need to make more than one. As a result, it is possible to express multiple colors with a single color LED without increasing the number of light sources 12, and the cost is also reduced. Further, a complicated control circuit for controlling the dimming, toning, change and the like of the LED is not necessary, and the circuit configuration is simplified. Therefore, predetermined information can be notified via the mask member 16 by the temperature indicating member 15 that has been discolored based on the temperature simply by controlling ON or OFF of the heat source unit 13.

  Furthermore, since the arrangement space of the board | substrate 19 and the light source 12 can be made smaller than before, the whole apparatus can be reduced in size and thickness, and can be easily attached even when it is incorporated in a vehicle body as a kicking plate. In addition, the aesthetic appearance of the vehicle is not impaired.

  Further, the display content can be freely changed by simply changing the shape of the opening 16A of the mask member 16. Therefore, a variety of display expressions including complex patterns and fine patterns can be realized, and more needs can be met.

  By the way, in the structure which arrange | positions the heat-source part 13 in the longitudinal direction both sides of the heat conductive member 14, a temperature difference arises by the area | region near from the heat-source part 13, and a distant area | region, and there exists a possibility that the time lag may arise in the relaxation. When a temperature difference occurs in the heat conducting member 14, it is conceivable that the entire temperature indicating member 15 does not change color uniformly when the entire temperature indicating member 15 is discolored and displayed.

  Therefore, in the present embodiment, the space 14A is provided in the heat conducting member 14 to circulate the air (warm air) heated by the heat source unit 13, and the temperature rise of the heat conducting member 14 and thus the temperature rise of the temperature indicating member 15 are increased. Is promoting. As described above, when the heat source portions 13 are arranged on both sides in the longitudinal direction of the heat conducting member 14, it takes time until the heat is transmitted to the central portion. Therefore, by forming the space portion 14A extending in the longitudinal direction of the heat conducting member 14, the air heated by the heat source portion 13 flows in the space portion 14A and spreads throughout the heat conducting member 14. As the high temperature air rises and the low temperature air falls, a circulatory flow is generated in the space 14A to cause a convective heat transfer phenomenon, eliminating an extreme temperature difference in the heat conducting member 14 and smooth and uniform. Can bring about a significant temperature change. As a result, the time lag required to alleviate the temperature difference in the heat conducting member 14 can be eliminated and temperature unevenness can be suppressed, and the temperature of the entire heat conducting member 14 can be increased uniformly in a short time. It becomes.

  According to the configuration of the present embodiment, the entire temperature indicating member 15 is uniformly heated in a short time by the synergistic effect of the heat conduction characteristics of the heat conducting member 14 itself and the warm air flowing action by the space portion 14A. Can be discolored in the same way. Thus, by effectively utilizing the air heated by the heat source unit 13, the heat conduction efficiency in the heat conducting member 14 is improved, and the color change of the temperature indicating member 15 can be quickly recognized. As a result, a display with good responsiveness can be performed.

  Here, conventionally, a technique for constructing a thermal functional structure by providing means having a heat collecting function and a heat insulating function as a structure for promoting a temperature rise has been proposed. However, in this case, a space for constructing the thermal functional structure must be secured. In addition, the structure of the thermal functional structure itself is complicated, or the thickness increases due to the provision of the thermal functional structure. It could be difficult.

On the other hand, if it is the structure of this embodiment, since it is not necessary to construct | assemble a thermal functional structure, design development is easy and a predetermined function can be achieved. Moreover, since it is not necessary to secure a space for installing the thermal functional structure, it is small and does not affect the aesthetic appearance as a kicking plate.
Thus, the kicking plate 9 with further improved merchantability can be provided by the display device 10 that can realize low cost and space saving and can display various colors.

  Further, in this embodiment, the heat conducting member 14 is housed in the outer case 18 with the one surface side where the space portion 14A is formed facing the temperature indicating member 15, but for example, as shown in FIG. The direction of the heat conducting member 14 may be turned upside down so that the one surface side where the space portion 14A is formed faces the bottom surface 18b of the outer case 18 (accommodating recess 18B).

  In the present embodiment, the temperature indicating member 15 is arranged on the surface of the heat conducting member 14, and specifically, the surface of the convex portion 14B existing between the space portions 14A is in contact with the temperature indicating member 15. However, for example, the height of the surface of the central portion in the longitudinal direction of the convex portion 14B may be partially reduced so that the warm air in the adjacent space portion 14A can flow through the convex portion 14B. .

Further, in the present embodiment, the light source 12 is used as the heat source unit 13, but other ones can be applied as long as they generate heat. For example, a device that generates light and emits light, such as an EL or a bulb, may be used.
Further, LEDs of the same color and different color can be freely selected as the light source 12 installed in each heat source unit 13.
In addition, the heat source unit 13 disposed to face the heat conduction member 14 may be arranged such that the optical axes of the light sources 12 facing each other are shifted in the width direction of the heat conduction member 14.

(Second Embodiment)
Next, the configuration of the display device according to the second embodiment will be described.
The basic configuration of this embodiment is the same as the configuration of the first embodiment, but differs in that an electronic component is provided in the space. Therefore, common parts are denoted by the same reference numerals, description thereof is omitted, and differences will be described in detail.

FIG. 8 is a cross-sectional view illustrating a schematic configuration of the display device according to the second embodiment. FIG. 9 is a diagram showing a schematic configuration of a heat conducting member in the second embodiment, where (a) is a plan view and (b) is a cross-sectional view.
As shown in FIG. 8, the display device 20 of the present embodiment has a configuration in which an electronic component (heat source) 21 is provided in a space portion 24 </ b> A of a heat conduction member (heat conduction portion) 24. As shown in FIGS. 9A and 9B, the heat conducting member 24 has one space portion 24A formed inside the convex portions 24B on both sides in the width direction. The space 24A has a groove shape that opens on both sides in the longitudinal direction of the heat conducting member 24, and is formed with a certain depth. Such a heat conducting member 24 is accommodated in the outer case 18 with one surface side on which the space portion 24 </ b> A is formed facing downward on the side opposite to the temperature indicating member 15. As a result, if the heat conducting member 14 is accommodated in the outer case 18, a space is naturally formed between the outer case 18 and a space in which air flows is formed.

  An electronic component 21 that generates heat, such as a resistor or a diode, is disposed in the space 24A. The number and arrangement position of the electronic components 21 are appropriately set according to the amount of heat generated. For example, it may be arranged one by one at both ends in the longitudinal direction of the space portion 24A, or may be arranged near the center in addition to this. The electronic component 21 is mounted on the bottom surface 18 b of the outer case 18, and the heat conducting member 24 is accommodated in the outer case 18 so as to be arranged in the space portion 24 </ b> A. Alternatively, it may be mounted on the heat conducting member 24 side.

  Also in the configuration of the present embodiment, the air flow heated by the electronic component 21 is actively circulated in the space 24A to promote the uniform temperature rise of the heat conducting member 24, and the temperature indicating member 15 is entirely Can be discolored.

  Moreover, cost reduction can be achieved by using the electronic component 21 as a heat source. Furthermore, since it is not necessary to worry about light leakage like an LED, the shape of the mask member 16 can be reduced.

10 and 11 are diagrams showing another configuration example in the second embodiment.
For example, as shown in FIG. 10, a convex portion 24B may be provided at the center in the width direction of the heat conducting member 24, and the space portions 24A may be formed on both sides thereof. In this case, the electronic components 21 are respectively arranged on at least both longitudinal sides in each space 24A.

Further, as shown in FIG. 11, the heat conducting member 24 may be accommodated in the outer case 18 with the one surface side on which the pair of space portions 24A are formed facing upward.
In the configuration as shown in FIGS. 10 and 11, since the number of electronic components 21 is increased, the temperature rise is inevitably accelerated, and the entire temperature indicating member 15 can be discolored in a shorter time.

(Third embodiment)
Next, the configuration of the display device according to the third embodiment will be described.
FIG. 12 is a plan view illustrating a schematic configuration of the display device according to the third embodiment. FIG. 13 is a diagram illustrating a heat conduction state (air flow state) in the heat conducting member of the third embodiment.
As shown in FIG. 12, the display device 30 of the present embodiment includes a heat conduction unit 340 including a pair of heat conduction members (heat conduction portions) 34. Each of the heat conducting members 34 has a triangular shape or a trapezoidal shape in plan view, and is combined with each other on a plane to form a rectangular shape as in the above embodiments. Light source portions (not shown) are arranged on both ends in the longitudinal direction of the heat conducting unit 340.

Each heat conducting member 34 is formed to have a narrower width on the other end side than on one end side in the longitudinal direction, and has a shape that becomes gradually narrower (thinner) as the distance from the heat source portion increases.
The heat conducting member 34 is formed with a space portion 34A and a plurality of convex portions 34B inside the side edge portions 34C on both sides in the width direction. Each heat conducting member 34 is arranged in such a posture that the space 34A extends in a direction away from the heat source part from a position close to the heat source part so that the wide end part 34a faces the light source part.

  Moreover, the front end side (end part by the side of the edge part 34b) of each convex part 34B is formed so that it may become thin. In other words, the adjacent convex portions 34B are narrower and tapered at the portions adjacent to each other, thereby ensuring the width of the space portion 34A formed between the convex portions 34B.

  In such a heat conduction unit 340, as shown in FIG. 13, the air heated by the heat source parts (not shown) arranged on both sides in the longitudinal direction is moved from the end 34a side of each heat conduction member 34 to each space. It flows into the portion 34A and flows toward the other end portion 34b.

  In the present embodiment, the shape of each heat conducting member 34 is formed so that the width on the end 34b side is narrower than the width on the end 34a side, so that the air inflow side is wide and the outflow side is narrow. Thus, the flow of air passing through the space 34A is accelerated, and the entire heat conducting member 14 is uniformly heated in a shorter time. Thereby, the heat conduction speed is accelerated, the temperature unevenness in the longitudinal direction of each heat conducting member 34 is quickly eliminated, and it can be expected that the heat conducting efficiency for the temperature indicating member 15 is further improved.

  In the present embodiment, the pair of heat conducting members 34 are used in combination so that their inclined surfaces face each other. However, depending on the design to be displayed, only one heat conducting member 34 may be used. Two or more may be used in combination.

  Moreover, in this embodiment, although it was set as the structure which provided the some convex part 34B in the heat conductive member 34, the structure which does not provide the convex part 34B may be sufficient. Simply, one space 34A may be provided, and the width of the entire space 34A may be reduced as the distance from the heat source increases.

  As described above, when it is desired to change the color of the temperature indicating member 15 in a local narrow range, it is possible to rapidly increase the temperature in the region near the heat source by disposing the heat source near the region. When it is desired to change the color of the temperature indicating member 15 as a whole, the temperature in the region far from the heat source does not increase easily. For this reason, a time lag is generated depending on the region until the entire temperature reaches the indicated temperature and changes color, and it is necessary to eliminate this. According to the configuration of each of the above-described embodiments, it is possible to eliminate the time lag in the temperature rise in the region and to uniformly change the temperature indicating member 15 by uniformly raising the temperature of the entire heat conducting member 14. It has become possible.

  Thereby, the display apparatus 10 excellent in display responsiveness can be obtained, and the kicking plate 9 with further improved merchantability can be provided. Further, since it is not necessary to provide a thermal functional structure, it is possible to realize low cost and space saving, and it is easy to incorporate into the kicking plate 9 and the aesthetic appearance is not impaired.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

For example, in each of the previous embodiments, the space portion 14A is provided so as to open to one surface side of the heat conducting member 14, but the space portion 14A is formed in the heat conducting member 14 as shown in FIGS. 14 (a) and 14 (b). It may be formed so as to be located in the central portion in the thickness direction.
Further, instead of providing the space portion 14A only on the front surface side of the heat conducting member 14, the space portion 14A may be formed on each of the front and back surfaces, or the space portion 14A may be formed on the side surface of the heat conducting member 14. Also good. The cross-sectional shape, size, position, and the like of the space portion 14A are determined as appropriate, and the number of space portions 14A is not limited to that illustrated.

  Furthermore, the space portion 14 </ b> A only needs to extend toward the central portion of the heat conducting member 14, and a part of the space portion 14 </ b> A opens to the light source 12 side, and the other portion opens to the side surface of the heat conducting member 14. Also good. For example, it is not limited to a linearly extending one, and may be a wave shape that draws a gentle curve, or may be another meandering shape.

  Further, although the heat conducting member 14 is made of a material having a heat conducting element, if a space capable of air flow can be formed, a material made of another material can be used as the heat conducting portion. Also good. For example, you may use the thing which formed the concave space part in the diffusion film or the acrylic board.

  In addition, printing is performed by gravure, screen, flexo, offset, or the like using a temperature indicating ink containing a temperature-sensitive color changing material such as a temperature indicating material or a temperature indicating pigment on one side of the heat conducting member 14 where the space 14A is not formed. Thus, the temperature indicating member 15 may be formed. Thus, by directly forming the temperature indicating member 15 on the heat conducting member 14, the heat conducting member 14 with the temperature indicating member 15 can be formed in advance, so that the manufacturing process can be shortened.

  Furthermore, it is good also as a structure which arrange | positions the heat conductive member 34 which has a light transmittance on the temperature indication member 15. FIG. In this case, it is preferable to cover the area where the electronic component 21 is disposed with the mask member 16. However, this is not necessary when the electronic component 21 is disposed outside the heat conducting member 24.

  Further, as the material of the light transmissive member 17, a mixed material in which materials having different light transmittances are mixed can be used. Further, depending on the situation, it is also possible to install with changing the light transmittance.

In each of the previous embodiments, an example of a display device used for a kicking plate installed in a side step portion of an automobile has been described. However, the display device is not limited to this, and can be incorporated in other locations. is there. For example, a glove box on the passenger side, foot lighting, an emblem at the center of the steering wheel, an emblem on the outside of the vehicle body, a license plate, and the like.
It can also be applied to other than automobiles.

  DESCRIPTION OF SYMBOLS 9 ... Kicking plate 10, 20, 30 ... Display apparatus, 11 ... Side step part, 12 ... Light source, 13 ... Heat source part (heat source), 14, 24, 34 ... Heat conduction member (heat conduction part), 14A, 24A , 34A ... space part, 15 ... temperature indicating member, 17 ... light transmitting member, 18 ... outer case, 21 ... electronic component (heat source)

Claims (8)

A heat source,
A heat conduction part for transferring heat from the heat source;
A temperature indicating member that changes color depending on the temperature transmitted from the heat conducting unit;
A light-transmitting member that fits into the outer case so as to cover the temperature indicating member, and sandwiches the heat source, the heat conducting portion, and the temperature indicating member with the outer case,
With
The heat conducting part has a space part for circulating air heated by heat generated from the heat source ,
The display device , wherein the space portion extends in a direction away from the heat source from a position close to the heat source .   The display device according to claim 1, wherein the space is formed in a concave shape that forms a gap with an adjacent member. 3. The display device according to claim 1, wherein a width of the heat conducting portion is reduced as the distance from the heat source is increased. Display device according to any one of claims 1 to 3, characterized in that the heat source is arranged opposite on both sides in the longitudinal direction of the heat-conducting portion. Said heat source, a display device according to any one of claims 1 to 4, characterized in that disposed in the heat in the space portion of the conductive portion. A plurality of the space portion, a display device according to any one of claims 1 to 5, at least a portion of each space portion, characterized in that communicate with each other. Display device according to any one of claims 1 to 6, wherein the heat source is a light source. Display device according to any one of claims 1 to 7, characterized in that used for kicking plate installed in the side step portion of the motor vehicle.

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