JP5452992B2 - Display device - Google Patents

Description

  The present invention relates to a display device. More specifically, the present invention can realize a clear display by a plurality of light emitting diodes arranged closely, and can be attached to a curved surface portion to be attached without a sense of incongruity, and further saves space. The present invention relates to a display device having a simple structure and low cost.

  As a conventional display device, a device in which a plurality of light emitting diodes are arranged side by side and the light emitting diodes are switched on / off to display characters and the like as a whole is generally known (see, for example, Patent Document 1).

  Patent Document 1 discloses a display device in which a flat sheet member 3 for displaying light of a light emitting diode is provided on the surface side of a plurality of light emitting diodes (LED1). However, in the technique of Patent Document 1, since the plurality of light emitting diodes are not partitioned independently from each other, particularly when the plurality of light emitting diodes are closely arranged, the lights of adjacent light emitting diodes overlap each other. Display content is unclear. Further, since a flat sheet member is employed, when the display device is attached to a curved surface portion to be attached, a sense of incongruity occurs.

  Various display devices that solve the above problems have been proposed (see, for example, Patent Documents 2 and 3).

  In Patent Document 2, each light-emitting diode is independently provided between a substrate 40 of a plurality of light-emitting diodes (LEDs 41) and a curved plate-like display panel (electric luminescent lamp 70) that displays light from these light-emitting diodes. A display device is disclosed that includes a housing 42 in which a plurality of insertion holes 43 are formed (see paragraph [0038] of FIG. 2 and FIG. 5). According to the technique of Patent Document 2, the light of each light emitting diode is clearly displayed on the display panel through each insertion hole 43 of the housing 42. Further, since the display panel is formed in a curved plate shape, there is no sense of incongruity even when the display device is attached to a curved surface portion as an attachment target.

  In Patent Document 3, a plurality of light guide members 6 that guide light of each light emitting diode are provided between a substrate 71a of the plurality of light emitting diodes and a curved plate-like panel 2 that displays the light of these light emitting diodes. A display device is disclosed (see paragraph [0032] of cited document 3 and FIG. 2 etc.). According to the technique of Patent Document 3, light from a plurality of light emitting diodes is clearly displayed on the panel 2 through the plurality of light guide members 6. Moreover, since the panel 2 is formed in a curved plate shape, there is no sense of incongruity even if the display device is attached to a curved surface portion as an attachment target.

  However, since the technique disclosed in Patent Document 2 employs a curved plate-like substrate 40 (film substrate), the substrate and thus the display device are expensive. In addition, when a plurality of light emitting diodes are densely arranged, adjacent light emitting diodes arranged on a curved plate-like substrate come into contact with each other, and thus a curved plate-like substrate cannot be adopted. .

  Further, since the technique of Patent Document 3 employs a large number of light guide members, a complicated structure in which the distance between the panel and the substrate is relatively wide, and the entire display device is saved. I can't. In addition, a large number of light guide members are required, and the number of parts increases, thereby deteriorating the workability of attaching the light guide members.

JP 2005-62441 A JP-A-9-173558 JP 2008-290685 A

  The present invention has been made in view of the above-described situation, and can realize clear display by a plurality of closely arranged light emitting diodes, can be attached to a curved surface portion as an attachment object without a sense of incongruity, and further saves space. It is an object of the present invention to provide a display device with a simple configuration and low cost that can be realized.

The present invention is as follows.
1. A flat substrate having a plurality of light emitting diodes disposed on the surface;
A curved plate-like display panel that is provided so as to cover the surface side of the substrate, displays light from the plurality of light emitting diodes, and has translucency;
Provided between the substrate and the display panel, the substrate side surface is formed in a plane along the surface of the substrate, and the display panel side surface is formed in a curved surface along the surface of the display panel, A housing member formed with a plurality of through holes for housing each of the plurality of light emitting diodes independently of each other;
Adhering the surface of the display panel and the curved surface of the housing member, and having a translucent adhesive layer,
The adhesive layer has a thickness of 0.05 to 0.20 mm,
The display panel has a thickness of 0.2 to 0.4 mm,
The minimum distance between the display panel and the substrate is 0.5 to 1.2 mm,
Maximum distance between the substrate and the display panel Ri 2~5mm der,
The display device is characterized in that the display panel is made of a blue resin, the light emitting diode is a red light emitting diode and has a luminous intensity of 200 to 400 mcd .
2. The adhesive layer is formed by laminating an acrylic pressure-sensitive adhesive layer on both sides of a polyester film layer. The display device described.
3. The adhesive layer is an acrylic pressure-sensitive adhesive layer. The display device described.
4). Among the plurality of light emitting diodes, an interval between centers of adjacent light emitting diodes is 2.0 to 3.0 mm. To 3. The display device according to any one of the above.
5. The above 1. used for vehicle interior materials . To 4. The display device according to any one of the above.

According to the display device of the present invention, the light of each light emitting diode disposed on the substrate reaches the adhesive layer through each through hole of the housing member, and passes through the transparent adhesive layer and the display panel. It is displayed on the display surface of the display panel. As described above, since the light of the plurality of light emitting diodes is displayed on the display panel by the housing member having the plurality of through holes and the adhesive layer having translucency, the light of each light emitting diode has high directivity. Thus, the lights of adjacent light emitting diodes can hardly overlap each other, and a clear display can be realized by a plurality of light emitting diodes arranged closely. In addition, a simple structure that can save space can be achieved as compared with a conventional display that displays light from a light emitting diode through a light guide member. In addition, since the adhesive layer has a light-transmitting property while having a role of adhering the housing member and the display panel, it can be clearly displayed on the display panel without diffusing light from the plurality of light-emitting diodes. . In addition, since the forming layer absorbs the molding error of the display panel and the housing member, the followability between the curved surfaces of the display panel and the housing member can be improved. Further, since the display panel is formed in a curved plate shape, the display device can be attached to the curved surface portion to be attached without a sense of incongruity. Furthermore, since the surface side of the substrate and the housing member is covered by the display panel, it is difficult to recognize the through holes of the light emitting diode and the housing member when the light emitting diode is not emitting light, and the design can be improved.
In addition, since the thickness of the adhesive layer is 0.05 to 0.20 mm, it is possible to increase the translucency of the adhesive layer to more reliably suppress the diffusion of light from the light emitting diode and to be suitable for the adhesive layer. Adhesiveness can be imparted.
Further, since the thickness of the display panel is 0.2 to 0.4 mm, it is possible to increase the translucency of the display panel to more reliably suppress the diffusion of light from the light emitting diode, and to prevent the light emitting diode from emitting light Sometimes it is difficult to more reliably recognize the light emitting diodes covered by the display panel and the through holes of the housing member.
In addition, since the minimum distance between the display panel and the substrate is 0.5 to 1.2 mm, the facing distance between the display panel and the substrate can be made relatively narrow, and a plurality of light emitting diodes arranged densely can be used. A clearer display can be realized.
Moreover, when the said adhesive layer laminates | stacks an acrylic adhesive layer on both surfaces of a polyester film layer, the translucency of an adhesive layer is improved more and the spreading | diffusion of the light from a light emitting diode is suppressed more reliably. Can do. In addition, by adopting the polyester film layer, the adhesive layer can be provided with high moisture resistance and waterproofness, so that failure of the red LED 7 or the substrate 2 due to moisture or the like can be prevented.
Further, when the adhesive layer is made of an acrylic pressure-sensitive adhesive layer, it is possible to reduce the thickness of the adhesive layer, further increase its translucency, and more reliably suppress the diffusion of light from the light emitting diode.
Further, when the center interval between adjacent light emitting diodes among the plurality of light emitting diodes is 2.0 to 3.0 mm, it is possible to realize a clearer display by the plurality of light emitting diodes arranged extremely densely. it can.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is the disassembled perspective view which looked at the display apparatus which concerns on an Example from the display surface side. It is the disassembled perspective view which looked at the said display apparatus from the non-display surface side. It is a longitudinal cross-sectional view which shows the said display apparatus typically. It is a top view which shows the board | substrate which concerns on an Example. It is a longitudinal cross-sectional view which shows the contact bonding layer which concerns on an Example. It is a longitudinal cross-sectional view which shows the contact bonding layer of another form.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

1. Display Device Embodiment 1 The display device according to the above includes a substrate, a display panel, a housing member, and an adhesive layer described below.

  The “substrate” is not particularly limited in structure, shape, size, material, and the like as long as a plurality of light emitting diodes are disposed on the surface and formed in a flat plate shape. The plurality of light emitting diodes can be arranged in a matrix, for example. Moreover, the center space | interval (s1) of the adjacent light emitting diode among these several light emitting diodes is 2.0-3.0 mm (preferably 2.25-2.75 mm, especially 2.4-2.6 mm). (See, for example, FIG. 3). Each light emitting diode has a size that can be arranged in a circle having a diameter of 1.5 to 3.0 mm (preferably 1.5 to 2.5 mm, particularly 1.9 to 2.2 mm), for example. be able to.

  As long as the “display panel” is provided so as to cover the surface side of the substrate, displays light from a plurality of light emitting diodes, has translucency, and has a curved plate shape, The shape, size, material, etc. are not particularly limited. The thickness (t1) of the display panel can be 0.2 to 0.4 mm (preferably 0.2 to 0.3 mm), for example (see, for example, FIG. 3). The minimum distance (s2) between the display panel and the substrate is, for example, 0.5 to 1.2 mm (preferably 0.75 to 1.2 mm, particularly 1.0 to 1.2 mm). (See, for example, FIG. 3). Further, the maximum distance (s3) between the display panel and the substrate can be, for example, 2 to 5 mm (preferably 2 to 4 mm, particularly 2.5 to 3.5 mm) (for example, see FIG. 3). . As a result, the facing distance between the display panel and the substrate can be made relatively narrow, and a clearer display can be realized by a plurality of closely arranged light emitting diodes, and a storage member disposed at the facing distance is required. High strength can be ensured. In addition, examples of the material of the display panel include polyolefins such as acrylonitrile / butadiene / styrene copolymer (ABS), polyamide (PA), polyethylene (PE), and polypropylene (PP), polystyrene (PS), and poly (polystyrene). Examples include vinyl chloride (PCV), acrylic resins (PMMA, etc.), polyesters such as polyethylene terephthalate (PET), polyacetal (POM), polycarbonate (PC), and the like.

  The “housing member” is provided between the substrate and the display panel, the substrate side surface is formed in a plane along the surface of the substrate, and the display panel side surface is formed in a curved surface along the surface of the display panel. The structure, shape, size, material, etc. are not particularly limited as long as a plurality of through-holes that accommodate each of the plurality of light-emitting diodes independently of each other are formed. Examples of the material of the housing member include polyolefins such as acrylonitrile / butadiene / styrene copolymer (ABS), polyamide (PA), polyethylene (PE) and polypropylene (PP), polystyrene (PS), poly Examples include vinyl chloride (PCV), acrylic resins (PMMA, etc.), polyesters such as polyethylene terephthalate (PET), polyacetal (POM), polycarbonate (PC), and the like. Moreover, as a planar shape of each through-hole, circular, an ellipse, and a polygon (for example, square, hexagon etc.) can be mentioned, for example. When each through hole is circular, the diameter of each through hole is, for example, 1.5 to 3.0 mm (preferably 1.5 to 2.5 mm, particularly 1.9 to 2.2 mm). it can.

  As long as the “adhesive layer” adheres (adheres) the surface of the display panel and the curved surface of the housing member, and has translucency, the structure, shape, size, material, etc. are not particularly limited. The adhesive layer is used as a broad meaning including an adhesive layer). As this adhesive layer, for example, (1) a form in which an acrylic pressure-sensitive adhesive layer is laminated on both sides of a polyester film layer (for example, see FIG. 5), and (2) a form composed of an acrylic pressure-sensitive adhesive layer (for example, (See FIG. 6). In the above forms (1) and (2), the acrylic pressure-sensitive adhesive layer is formed by emulsion polymerization of one or more acrylate esters such as ethyl acrylate, butyl acrylate, and -2-ethylhexyl acrylate. And an acrylic emulsion pressure-sensitive adhesive layer. Examples of the tackifier for the pressure-sensitive adhesive include rosin resin, terpene phenol resin, terpene resin, and coumarone / indene resin. In the form (1), examples of the material for the polyester film layer include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), and polybutylene terephthalate (PBT). The thickness (t2) of the adhesive layer can be, for example, 0.05 to 0.20 mm (preferably 0.10 to 0.20 mm, particularly 0.10 to 0.15 mm) (for example, (See FIG. 3).

  Here, the first embodiment. As the display device according to the above, for example, the display panel is blue, the light emitting diode is a red light emitting diode, and the luminous intensity is 200 to 400 mcd (preferably 250 to 400 mcd, particularly 300 to 400 mcd). Can be mentioned. Thereby, a clearer display by a plurality of light emitting diodes arranged densely can be realized. In this embodiment, it is preferable that the housing member is gray. This is because the through holes of the housing member can be made more difficult to recognize more reliably when the light emitting diode is not lit. The blue color includes indigo in addition to blue, and the red color includes tea and dark tea in addition to red. Examples of the coloring method include a form in which a colorant (pigment) is added and resin molding, a form in which a colored coating film is formed, and the like.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In the present embodiment, a display device used as a vehicle interior material such as a door trim is exemplified as the “display device” according to the present invention.

(1) Configuration of Display Device As shown in FIGS. 1 to 3, the display device 1 according to the present embodiment includes a flat substrate 2, a translucent curved plate display panel 3, a housing member 4, and the like. And a translucent adhesive layer 5.

  A plurality of red LEDs 7 (illustrated as “light emitting diodes” according to the present invention) are arranged in a matrix on the surface of the substrate 2 (see FIG. 4). Among these red LEDs 7, the center interval s1 between adjacent red LEDs 7 is about 2.5 mm (see FIG. 3). Each red LED 7 has a size that can be arranged in a circle having a diameter of about 2.0 mm. The luminous intensity of each red LED 7 is about 300 mcd.

  The display panel 3 is made of blue (Kensaikan International Co., Ltd. No. SCOTDIC 673006) polycarbonate resin. The display panel 3 is provided so as to cover the surface side of the substrate 2. Further, the display panel 3 has a display surface 3a for displaying light from the plurality of red LEDs 7. The display panel 3 has a thickness t1 of about 0.25 mm (see FIG. 3). The minimum distance s2 between the display panel 3 and the substrate 2 is about 1.15 mm, and the maximum distance s3 between the display panel 3 and the substrate 2 is about 3.15 mm (see FIG. 3).

  The housing member 4 is made of gray (Japan Paint Industry Association No. YN-55) ABS resin. The housing member 4 is attached to a base member 6 having substantially the same planar shape as the display panel 3 and is provided between the substrate 2 and the display panel 3. Further, the accommodating member 4 is formed such that the surface on the substrate 2 side is a flat surface 4 a along the surface of the substrate 2 and the surface on the display panel 3 side is formed on a curved surface 4 b along the surface of the display panel 3 (FIG. 3). reference). The housing member 4 is formed with a plurality of through holes 8 for housing the red LEDs 7 independently of each other. The planar shape of each through hole 8 is a circle having a diameter of about 2.0 mm. The base member 6 is provided with a guide portion 6a for guiding and positioning a side edge portion of the substrate 2 when the substrate 2 is attached to the base member 6 (see FIG. 3).

  The adhesive layer 5 has substantially the same planar shape as the display panel 3. The adhesive layer 5 bonds the surface of the display panel 3 (the surface opposite to the display surface 3 a) and the curved surface 4 b of the housing member 4. As shown in FIG. 5, the adhesive layer 5 is formed by laminating acrylic pressure-sensitive adhesive layers 11 and 11 on both surfaces of a film layer 10 made of polyethylene terephthalate (illustrated as “polyester film layer” of the present invention). ing. The thickness t2 of the adhesive layer 5 is about 0.15 mm.

(2) Operation of Display Device Next, the operation of the display device 1 having the above configuration will be described.
The light of the plurality of red LEDs 7 that have been turned on passes through the through holes 8 of the housing member 4 and reaches the adhesive layer 5, passes through the translucent adhesive layer 5 and the display panel 3, and displays the display surface of the display panel 3. Up to 3a. Therefore, by switching on / off each red LED 7, information such as the vehicle speed, the vehicle state, the remaining battery level, and error information is displayed on the display surface 3a of the display panel 3.

(3) Effect of Example As described above, in the display device 1 of this example, the light from the plurality of red LEDs 7 is displayed on the display panel 3 by the housing member 4 having the plurality of through holes 8 and the light-transmitting adhesive layer 5. Display on the display surface 3a, it is possible to make the light of each red LED 7 have high directivity and make it difficult for the lights of the adjacent red LEDs 7 to overlap each other, and a clear display by a plurality of closely arranged red LEDs 7 Can be realized. In addition, a simple structure that can save space can be achieved as compared with a conventional display that displays light from a light emitting diode through a light guide member. Moreover, since the adhesive layer 5 has a role of adhering the housing member 4 and the display panel 3 and has translucency, the display surface 3 a of the display panel 3 is not diffused without diffusing light from the plurality of red LEDs 7. Can be displayed clearly. In addition, since the molding error of the display panel 3 and the housing member 4 is absorbed by the adhesive layer 5, the followability between the curved surfaces of the display panel 3 and the housing member 4 can be enhanced. Moreover, since the display panel 3 is formed in a curved plate shape, the display device 1 can be attached to the curved surface portion to be attached without a sense of incongruity. Furthermore, since the display panel 3 covers the surface side of the substrate 2 and the housing member 4, it is difficult to recognize the red LED 7 and the through-hole 8 of the housing member 4 when the red LED 7 is not emitting light, and the design can be improved.

  Further, in this embodiment, the adhesive layer 5 is formed by laminating the acrylic pressure-sensitive adhesive layers 11 and 11 on both surfaces of the film layer 10. Can be more reliably suppressed. Moreover, since the adhesive layer 5 can be provided with high moisture resistance and waterproofness by employing the film layer 10 made of polyethylene terephthalate, it is possible to prevent a failure of the red LED 7 or the substrate 2 due to moisture or the like.

  Further, in this embodiment, since the thickness t2 of the adhesive layer 5 is set to about 0.15 mm, the translucency of the adhesive layer 5 can be further increased and the diffusion of light from the red LED 7 can be more reliably suppressed, and the adhesive The layer 5 can have appropriate adhesion.

  Further, in this embodiment, since the thickness t1 of the display panel 3 is about 0.25 mm, the translucency of the display panel 3 can be further improved and the diffusion of light from the red LED 7 can be more reliably suppressed, and the red color can be reduced. When the LED 7 is not emitting light, the red LED 7 covered by the display panel 3 and the through-hole 8 of the housing member 4 can be more reliably recognized.

  In this embodiment, the minimum distance s2 between the display panel 3 and the substrate 2 is about 1.15 mm, and the maximum distance s3 between the display panel 3 and the substrate 2 is about 3.15 mm. 2 can be made relatively narrow, and a clearer display by a plurality of red LEDs 7 arranged densely can be realized.

  Further, in this embodiment, since the center interval s1 of the adjacent red LEDs 7 out of the plurality of red LEDs 7 is about 2.5 mm, a clearer display can be realized by the plurality of red LEDs 7 arranged extremely densely. Can do.

  Furthermore, in this embodiment, the display panel 3 is blue, and the luminous intensity of the red LED 7 is about 300 mcd, so that a clearer display with a plurality of closely arranged red LEDs 7 can be realized. In particular, in the present embodiment, since the housing member 4 is gray, each through-hole 8 of the housing member 4 can be more reliably prevented from being recognized when the red LED 7 is not lit.

  In the present invention, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above embodiment, the adhesive layer 5 having a three-layer structure is illustrated, but the present invention is not limited thereto. For example, as shown in FIG. 6, as the adhesive layer 15 including only one acrylic pressure-sensitive adhesive layer 11. Also good. In this case, it is possible to further reduce the thickness of the adhesive layer 15, further increase its translucency, and more reliably suppress the diffusion of light from the red LED 7.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials, and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope of.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  It is widely used as a technique for displaying information such as characters, designs, and animations. In particular, the present invention is suitably used as a display device used as an interior material or exterior material for vehicles such as trains, buses, trucks, and other vehicles such as trains, trains, and other railway vehicles, construction vehicles, agricultural vehicles, and industrial vehicles.

  DESCRIPTION OF SYMBOLS 1; Display apparatus, 2; Board | substrate, 3; Display panel, 4; Accommodating member, 5; Adhesion layer, 7: Red LED, 8: Through-hole, 10; Film layer, 11: Acrylic adhesive layer, s1: Red LED center distance, s2; minimum distance between display panel and substrate.

Claims (5)

A flat substrate having a plurality of light emitting diodes disposed on the surface;
A curved plate-like display panel that is provided so as to cover the surface side of the substrate, displays light from the plurality of light emitting diodes, and has translucency;
Provided between the substrate and the display panel, the substrate side surface is formed in a plane along the surface of the substrate, and the display panel side surface is formed in a curved surface along the surface of the display panel, A housing member formed with a plurality of through holes for housing each of the plurality of light emitting diodes independently of each other;
Adhering the surface of the display panel and the curved surface of the housing member, and having a translucent adhesive layer,
The adhesive layer has a thickness of 0.05 to 0.20 mm,
The display panel has a thickness of 0.2 to 0.4 mm,
The minimum distance between the display panel and the substrate is 0.5 to 1.2 mm,
Maximum distance between the substrate and the display panel Ri 2~5mm der,
The display device is characterized in that the display panel is made of a blue resin, the light emitting diode is a red light emitting diode and has a luminous intensity of 200 to 400 mcd .   The display device according to claim 1, wherein the adhesive layer is formed by laminating an acrylic pressure-sensitive adhesive layer on both sides of a polyester film layer.   The display device according to claim 1, wherein the adhesive layer includes an acrylic pressure-sensitive adhesive layer.   4. The display device according to claim 1, wherein a center distance between adjacent light emitting diodes among the plurality of light emitting diodes is 2.0 to 3.0 mm. 5. The display apparatus as described in any one of Claims 1 thru | or 4 used for a vehicle interior material .

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