JP2021173899A - Display unit - Google Patents

Abstract

To provide a display unit that prevents a photo-curable adhesive from protruding from between a cover plate and a display.SOLUTION: A display unit 100 has at least: display means 2 that has a display element 21 provided with a display area 21a that can display predetermined information; a protective member 1 that covers the display means 2 on the front of the display means 2; a resin member 5 that fills a gap formed between the display means 2 and the protective member 1 and bonds the display means 2 and the protective member 1 to each other; and a bank member 6 that is arranged between the gap formed between the display means 2 and the protective member 1 and on the outer periphery of the resin member 5. In the display unit 100, the protective member 1 has a concave part 13 or a convex part 15 that is formed in a concave shape or a convex shape at a position opposite to the bank member 6, and the concave part 13 or the convex part 15 holds the bank member 6.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to, for example, a display device used in an instrument device for a vehicle.

As a conventional display device, for example, there is one disclosed in Patent Document 1. The display device according to Patent Document 1 has a structure in which a transparent cover plate and a display device made of a liquid crystal display are bonded with a photocurable adhesive. The photocurable adhesive is filled in the area surrounded by the frame-shaped holding frame to prevent protrusion from the cover plate and the display.

This method requires a holding frame, which increases the cost of parts. In order to solve such a problem, a method is known in which an embankment is formed of a high-viscosity adhesive and a photocurable adhesive is filled in a region surrounded by the embankment.

Japanese Unexamined Patent Publication No. 2017-026999

However, there is a problem that the embankment moves due to the filling pressure of the photo-curable adhesive, the photo-curable adhesive protrudes from the cover plate and the display, and the yield of the product is lowered.

Therefore, the present disclosure has been made in view of such a point, and an object of the present disclosure is to provide a display device for preventing the photocurable adhesive from protruding from the cover plate and the display device.

In order to achieve the above object, the display device 100 of the present disclosure includes a display means 2 having a display element 21 provided with a display area 21a capable of displaying predetermined information, and the display means 2 in front of the display means 2. The protective member 1 to be covered, the resin member 5 that is filled in the gap formed between the display means 2 and the protective member 1 and adheres the display means 2 and the protective member 1, the display means 2 and the said. In the display device 100 having at least a gap formed between the protective member 1 and the embankment member 6 arranged on the outer periphery of the resin member 5, the protective member 1 is recessed at a position facing the embankment member 6. It is characterized by having uneven portions 13 and 15 formed in a shape or a convex shape, and the uneven portions 13 and 15 hold the embankment member 6.

The front view of the display device which concerns on 1st Embodiment of this disclosure. A cross-sectional view taken along the line AA of the display device shown in FIG. The figure corresponding to FIG. 2 of the display device which concerns on 2nd Embodiment of this disclosure.

The display device 100 according to the embodiment of the present disclosure will be described with reference to FIGS. 1 to 3.

The display device 100 is mounted on a vehicle (for example, an automobile) and is configured as an instrument device that displays a predetermined measured amount (vehicle speed, etc.). However, the display device 100 can also be applied to, for example, an instrument device for a vehicle mounted on a moving body equipped with a motorcycle or an agricultural machine or a construction machine.

In the following, in order to facilitate understanding of the configuration of the display device 100, the direction (cover plate 1 side) in which the user seated in the vehicle driver's seat is viewed from the display device 100 is set to "front (front)" for each member. ) ”, And the opposite side (circuit board 4 side) is defined as“ rear (rear surface) ”, and each is indicated by the arrows“ Fr. ”And“ Re. ”In the figure.

(First Embodiment)
As shown in FIGS. 1 and 2, the display device 100 includes a display (display means) 2 having a display element 21 provided with a display area 21a capable of displaying predetermined information, and a display 2 in front of the display 2. The display means 2 and the cover plate 1 are filled in the gap formed between the cover plate (protective member) 1 covering the cover plate (protective member) 1, the circuit board 4 arranged behind the display 2, and the display means 2 and the cover plate 1. It is formed between the transparent adhesive layer (resin member) 5 for adhering to the cover plate 1, the case body 3 arranged between the cover plate 1 and the circuit board 4 and supporting the cover plate 1, and the display means 2 and the cover plate 1. It has at least a gap and an embankment member 6 arranged on the outer periphery of the transparent adhesive layer 5.

The cover plate 1 is arranged on the front surface of the case body 3 and includes a base material 11 and a light-shielding layer (colored layer) 12. The base material 11 is made of, for example, a transparent or translucent thin plate-shaped synthetic resin (for example, polycarbonate or acrylic). The light-shielding layer 12 is formed by printing black-colored light-shielding ink on substantially the entire area of the back surface of the base material 11.

The light-shielding layer 12 has a window portion 12a and a light emitting portion 12b. The window portion 12a is formed at a substantially central position of the display device 100 in a substantially rectangular shape corresponding to the display area 21a, and the light-shielding layer 12 is not formed. The window portion 12a allows the driver to see through the display area 21a. A plurality of light emitting units 12b are arranged at the outer peripheral positions of the window unit 12a, and are formed in a so-called blank character shape in the shape of an icon, a symbol, or the like, and are a portion that serves as a design of a predetermined operation light or warning light.

The cover plate 1 has a recess (concavo-convex portion) 13 on the back surface of the base material 11. The recess 13 is a U-shaped recessed notch with an opening on the back side. The recess 13 is formed so as to cover the outer periphery of the window portion 12a at a position between the window portion 12a and the light emitting portion 12b and a position facing the leading edge portion 27b of the frame 27 described later.

The display 2 includes a display element 21 arranged in front and provided with a substantially rectangular display area 21a, an optical sheet 22 for guiding illumination light from behind to a well-known display element 21, a light source 23, and a reflector 24. The lighting means 26 including the display element 21 and the panel light source 25, the frame 27 made of metal such as aluminum that holds and accommodates the display element 21 and the lighting means 26, and the frame 27 connected to the display element 21 and the panel light source 25 from behind the frame 27 to the outside. It is composed of a flexible wiring board (FPC: Flexible Printed Circuits) 28 to be derived, and the like.

The display element 21 is composed of, for example, a dot matrix type TFT (Thin Film Transistor) type LCD (Liquid Crystal Display) display panel having a plurality of pixels. The display element 21 is electrically connected to the circuit board 4 via the flexible wiring board 28, and based on various information acquired from the vehicle's ECU (Electronic Control Unit), the engine speed, average fuel consumption, and fuel consumption related to the vehicle are used. , Predetermined information such as outside temperature is displayed in the display area 21a as an image.

The frame 27 is made of a conductive material made of metal such as aluminum or stainless steel, and has an opening 27a which is opened forward in a substantially rectangular shape corresponding to the display area 21a, and a cover plate 1 which is an outer peripheral portion of the opening 27a. It has a leading edge portion 27b located between the display elements 21.

The panel light source 25 is composed of a vertical light emitting LED (chip type light emitting diode: Light Emitting Diode), emits light of an arbitrary color in a direction parallel to the surface direction of the display element 21, and transmits the light to the light guide body 23. Incident. The light guide 23 is made of a transparent flat synthetic resin, guides the light from the panel light source 25, and emits the light to the optical sheet 22 by the white reflector 24. The optical sheet 22 is made of, for example, a diffusion sheet or a prism sheet, and diffuses the light from the light guide 23 and transmits it toward the display element 21.

One end of the flexible wiring board 28 is connected to the back surface of the circuit board 4, and the display 2 and the circuit board 4 are electrically connected to each other. The display 2 may be an organic EL display (OELD: Organic Electro Luminescence Display) or the like.

The case body 3 is made of, for example, a light-shielding white synthetic resin material (for example, polypropylene) and is arranged behind the display 2 and in front of the circuit board 4. The case body 3 has an accommodating portion 31 and an illumination chamber 32.

The accommodating portion 31 is formed in a concave shape so as to cover a portion other than the front surface of the indicator 2 from the back side, and accommodates the indicator 2. The illumination chamber 32 is formed in a cylindrical shape corresponding to each light emitting unit 12b, and accommodates a light source 7 arranged on a circuit board 4 described later.

The light source 7 is composed of a chip-type light emitting diode that emits an appropriate color, and is arranged in an illumination chamber 32 on a circuit board 4 behind a light emitting unit 12b. The light emitted by the light source 7 is efficiently reflected on the inner surface of the illumination chamber 32, reaches the cover plate 1 and passes through the light emitting unit 12b, so that the user can visually recognize the light emitting unit 12b.

The circuit board 4 is configured by printing various wirings on, for example, a plate-shaped base material having an insulating property made of glass epoxy resin (Glass Fiber Reinforced Plastics). A light source 7, a control unit 8, necessary electronic elements (not shown), and the like are mounted on the front surface of the circuit board 4, and they are electrically connected to each other. The control unit 8 displays the display 2 based on the information input from the outside.

The embankment member 6 is a silicon-based adhesive colored black, which is similar in color to the light-shielding layer 12. The embankment member 6 is adhesive (intermediate between liquid and solid) and is applied in a large amount so as to protrude into the recess 13 of the cover plate 1. After that, when the display 2 and the cover plate 1 are attached to each other, the embankment member 6 is arranged in the gap formed between the recess 13 and the leading edge portion 27b. The embankment member 6 is a material having a higher viscosity than the transparent adhesive layer 5, and temporarily adheres the cover plate 1 and the display 2. The embankment member 6 may be cured by various methods such as natural drying and UV irradiation.

The transparent adhesive layer 5 is a transparent silicon-based optical adhesive. The transparent adhesive layer 5 is a liquid and is a gap formed between the cover plate 1 and the display 2, and fills the space formed by the cover plate 1, the display 2, and the embankment member 6. The transparent adhesive layer 5 is then cured by various methods such as natural drying and UV irradiation to bond the cover plate 1 and the display 2. The refractive index of the transparent adhesive layer 5 is set to substantially the same as the refractive index of the cover plate 1.

The transparent adhesive layer 5 eliminates interfacial reflection between the cover plate 1 and the air layer or between the display element 21 and the air layer, and can improve the visibility of predetermined information displayed in the display area 21a. The transparent adhesive layer 5 and the embankment member 6 may be urethane-based or acrylic-based adhesives.

By being formed in this way, the embankment member 6 is formed so that the embankment member 6 is filled in the recess 13, so that when the transparent adhesive layer 5 is filled, the embankment member 6 is filled with the transparent adhesive layer. Even if the filling pressure of 5 is applied, the embankment member 6 is caught in the recess 13 and does not move, so that it can be prevented from flowing out from the gap formed between the cover plate 1 and the display 2.

Further, since the embankment member 6 is colored in the same color as the light-shielding layer 12, it is possible to reduce the discomfort in appearance of the recess 13.

(Second embodiment)
A second embodiment of the display device according to the present disclosure will be described with reference to FIG. The same parts and equal parts as those in the first embodiment described above will be described with the same reference numerals.

In the first embodiment, the light-shielding layer 12 is formed on the back surface of the base material 11, but in the present embodiment, the light-shielding layer 14 is printed and formed on the front surface of the base material 11 in the same printing range as the light-shielding layer 12. Is formed as. The light-shielding layer 14 has a window portion 14a and a light-emitting portion 14b, similarly to the light-shielding layer 12.

In the present embodiment, the concave portion 13 is formed as a convex portion (concave and convex portion) 15 whose back surface side protrudes in a U-shape. The convex portion 15 is formed at a position similar to that of the concave portion 13. The embankment member 6 is adhesive and is applied to the inside of the convex portion 15 in a large amount. After that, when the display 2 and the cover plate 1 are attached to each other, the embankment member 6 is arranged in the gap formed between the convex portion 15 and the leading edge portion 27b.

By being formed in this way, when the transparent adhesive layer 5 is filled with the embankment member 6, even if the filling pressure of the transparent adhesive layer 5 is applied to the embankment member 6, the embankment member 6 is caught by the convex portion 15 and moves. Therefore, it is possible to prevent the outflow from the gap formed between the cover plate 1 and the display 2.

The present disclosure is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present disclosure without departing from the present disclosure.

1 Cover plate (protective member)
11 Base material 12 Light-shielding layer (colored layer)
12a Window part 12b Light emitting part 13 Recessed part (concave and convex part)
14 Light-shielding layer (colored layer)
14a Window part 14b Light emitting part 15 Convex part (concavo-convex part)
2 Display (display means)
21 Display element 21a Display area 3 Case body 31 Recessed 32 Lighting room 4 Circuit board 5 Transparent resin sheet (resin member)
6 Embankment member 7 Light source 8 Control unit

Claims (5)

A display means having a display element provided with a display area capable of displaying predetermined information, and a display means.
A protective member that covers the display means on the front surface of the display means,
A resin member that fills the gap formed between the display means and the protective member and adheres the display means and the protective member.
A gap formed between the display means and the protective member and an embankment member arranged on the outer periphery of the resin member.
In a display device that has at least
The protective member has a concave-convex or convex concave-convex portion formed at a position facing the embankment member, and has a concave-convex shape.
A display device in which the uneven portion holds the embankment member. The display device according to claim 1, wherein the embankment member blocks the outflow of the resin member from the gap. The display device according to claim 1, wherein the uneven portion is formed in the concave shape, and the embankment member is filled inside the concave shape. The protective member has a colored layer on the display means side.
The display device according to claim 2, wherein the embankment member is formed in a color similar to that of the colored layer. The colored layer has a window portion that allows the display means to be seen through, and a light emitting portion on the outer periphery of the window portion.
It has a light source behind the light emitting part and has a light source.
The display device according to claim 4, wherein the uneven portion is located between the window portion and the light emitting portion.

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