JP2020177122A - Display device - Google Patents

Abstract

To provide a display device that reduces variance in pasting a cover plate and a display together.SOLUTION: A display device 100 includes: at least display means 2 having a display element provided with a display area 21a capable of displaying prescribed information; a protective member 1 for covering the display means 2 in front of the display means 2; a transparent resin layer filled in a space formed between the display means 2 and the protective member 1 for bonding the display means 2 and the protective member 1 together; and a case body 3 for supporting the protective member 1 at the back. In the display device, the protective member 1 has notched or hole-shaped positioning parts 13, 14 for fixing the position with respect to the case body 3, the positioning parts 13, 14 having right-angled portions formed in shape of right angle.SELECTED DRAWING: Figure 1

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 liquid crystal are bonded with a photocurable adhesive. When the cover plate to which the display is adhered is placed on the case body, the display is housed in the recess of the case body.

JP-A-2018-067004

However, if there is a large variation in the bonding between the cover plate and the display, the display may interfere with the recess of the case body, so it is necessary to make the recess larger than the outer shape of the display. As a result, there is a problem that the outer shape of the case body becomes larger and the outer shape of the entire display device also becomes larger.

Therefore, the present invention has been made in view of such a point, and an object of the present invention is to provide a display device that reduces variations in bonding between a cover plate and a 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. A transparent resin layer 5 that fills a gap formed between the protective member 1 that covers the display means 2 and the protective member 1 and adheres the display means 2 and the protective member 1 and the protective member 1 In a display device having at least a case body 3 supported behind the case, the protective member 1 has notches or hole-shaped positioning portions 13 and 14 for positioning with the case body 3, and the positioning portion 13 and 14 are characterized by having right-angled portions 13a and 14a formed at right angles.

The present disclosure can provide a display device that reduces variations in the bonding of the cover plate and the display device.

The front view of the display device which concerns on embodiment of this disclosure. A cross-sectional view taken along the line AA of the display device shown in FIG. An enlarged view of part B of the display device shown in FIG. An enlarged view of part C of the display device shown in FIG. The figure which shows the bonding method of a cover panel 1 and a display 2. The figure which shows the modification of FIG.

The display device 100 according to the embodiment of the present disclosure will be described with reference to FIGS. 1 to 6.

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.).

In the following, in order to facilitate understanding of the configuration of the display device 100, the direction (cover panel 1 side) in which the user sitting in the driver's seat of the vehicle is viewed from the display device 100 is set to "front (front)" for each member. ) ”, The opposite side (circuit board 4 side) is referred to as“ rear (rear surface) ”, and each is indicated by the arrows“ Fr. ”And“ Re. ”In the figure. In addition, "up", "bottom", "left", and "right" will be appropriately described as arrows "To.", "Bo.", "L", and "R" in the figure.

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 on the front surface of the display 2. The cover panel (protective member) 1 that covers 2 and the circuit board 4 that is arranged behind the display 2 and supports the display 2 and the gap formed between the display means 2 and the cover panel 1 are filled. It has at least a transparent resin sheet (transparent resin layer) 5 for adhering the display means 2 and the cover panel 1, and a case body 3 for supporting the cover panel 1 behind.

As shown in FIG. 2, the cover panel 1 is arranged on the front surface of the case body 3 and includes a base material 11 and a light-shielding 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 a light-shielding ink such as black 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 an operation / warning light 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. The operation / warning light unit 12b is a portion formed in a so-called blank character shape in the shape of an icon, a symbol, or the like for notifying predetermined warning information at the left and right positions of the window unit 12a. A plurality of operation / warning light units 12b are provided at left and right positions.

The cover panel 1 has a first positioning hole 13 and a second positioning hole 14. As shown in FIG. 3, the first positioning hole 13 is arranged at a substantially central position on the outer periphery of the upper side of the cover panel 1. The first positioning hole 13 is formed in a substantially U-shape with the outer shape side of the cover panel 1 open and a notch shape extending in parallel with the vertical direction. The first positioning hole 13 is formed along the end surface of the first positioning hole 13 when viewed from the surface, and at least one first right-angled portion 13a is formed at a right angle to the upper end surface 1a of the cover panel 1. Have. The first right-angled portion 13a has a vertex P1.

As shown in FIG. 3, the light-shielding layer 12 has a first transparent portion 12c in which the light-shielding layer 12 is not formed so as to surround the first positioning hole 13 with a constant width around the first positioning hole 13. The light-shielding layer 12 has a first right-angled colored portion (colored portion) 12d in which the first transparent portion 12c is not formed in the first right-angled portion 13a and is colored by the light-shielding layer 12.

As shown in FIG. 4, one second positioning hole 14 is arranged on each of the left and right outer circumferences of the cover panel 1. The second positioning hole 14 is formed in a substantially U-shape with the outer shape side of the cover panel 1 open and a notch shape extending in parallel in the left-right direction. The second positioning hole 14 is formed along the end surface of the second positioning hole 14 when viewed from the surface, and at least one second right-angled portion 14a is formed at a right angle to the left and right end surfaces 1b of the cover panel 1. Have. The second right-angled portion 14a has a vertex P2.

As shown in FIG. 4, the light-shielding layer 12 has a second transparent portion 12e in which the light-shielding layer 12 is not formed so as to surround the second positioning hole 14 with a constant width around the second positioning hole 14. The light-shielding layer 12 has a second right-angled colored portion (colored portion) 12f in which the second transparent portion 12e is not formed in the second right-angled portion 14a and the light-shielding layer 12 is formed.

The positions of the base material 11 and the light-shielding layer 12 may vary due to the deviation of the printing process of the light-shielding layer 12 and the deviation of the outer shape punching process (die-cutting step) of the cover panel 1. The first transparent portion 12c is formed with a constant width with respect to the first positioning hole 13, but does not have a constant width when the positions of the base material 11 and the light-shielding layer 12 are displaced. Since this constant width is set to the permissible value of the misalignment between the base material 11 and the light-shielding layer 12, it can be seen that when this width exists, it is within the permissible value of the misalignment. Therefore, the first transparent portion 12c is formed for the purpose of visually confirming the positional deviation between the base material 11 and the light-shielding layer 12. The second transparent portion 12e is also formed for the same purpose.

The display 2 includes a display element 21 provided with a substantially rectangular display area 21a, an illumination means 22 composed of an optical sheet, a light guide, and a light source for guiding illumination light to the display element 21, and the display element 21 and illumination. A resin case (not shown) for holding the means 22, a frame 23 made of a metal such as aluminum for accommodating the means 22, a flexible wiring board (FPC: Flexible Printed Circuits) 24 connected to the display element 21 and a light source, and the like. And so on.

The display element 21 comprises, 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 24, and based on various information acquired from the vehicle's ECU (Electronic Control Unit) (not shown), the engine speed and the engine speed related to the vehicle Predetermined information such as average fuel consumption, fuel consumption, and outside temperature is displayed in the display area 21a as an image.

The frame 23 has an opening 23a that opens substantially rectangularly corresponding to the display area 21a, and four metal boss bodies 23b that project toward the back side and require threaded holes.

One end of the flexible wiring board 24 is connected to the back surface of the circuit board 4, and the display 2 and the circuit board 4 are conductively connected. 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), is arranged behind the display 2, and is arranged in front of the circuit board 4. The case body 3 has a first positioning pin (positioning portion) 31, a second positioning pin (positioning portion) 32, a recess 33, an illumination chamber 34, and a mounting surface 35.

The first positioning pin 31 and the second positioning pin 32 project in a cylindrical shape from the mounting surface 35 at positions corresponding to the first positioning hole 13 and the second positioning hole 14 of the cover panel 1, respectively. The diameter of the first positioning pin 31 is formed to be substantially the same as the width of the first positioning hole 13 in the left-right direction. The first positioning pin 31 is fitted with the first positioning hole 13 to position the cover panel 1 in the left-right direction. The diameter of the second positioning pin 32 is formed to be substantially the same as the width of the second positioning hole 14 in the vertical direction. The second positioning pin 32 is fitted with the second positioning hole 14 to position the cover panel 1 in the vertical direction.

The recess 33 is formed in a concave shape and covers a portion other than the front surface of the display 2 including the display area 21a from the back side, and houses the display 2. The case body 3 is formed by providing a gap G in the left-right direction between the display 2 and the recess 33. The recess 33 has a boss hole 33a for accommodating the boss body 23b.

The lighting chamber 34 is formed in a tubular shape corresponding to each operation / warning light unit 12b. The lighting chamber 34 accommodates a light emitting element 6 arranged on a circuit board 4, which will be described later. The light emitted by the light emitting element 6 is efficiently reflected on the inner surface of the lighting chamber 34 and reaches the cover panel 1 to illuminate the operation / warning light unit 12b to emit light.

The mounting surface 35 is a surface on which the cover panel 1 arranged on the front surface of the case body 3 is mounted.

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 emitting element 6, a control unit (not shown), 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 displays the display 2 based on the information input from the outside. The circuit board 4 is formed corresponding to the boss body 23b and has a screw hole 41 through which the screw 7 is passed. The display 2 is fixed to the circuit board 4 by a fixing means such as a screw 7 inserted from the back side of the circuit board 4.

The transparent resin sheet 5 is composed of a transparent optical adhesive (OCA) sheet, and is laminated inside the opening 23a without a gap between the back surface of the cover panel 1 and the front surface of the display element 21. The cover panel 1 and the display 2 are adhered to each other.

The light emitting element 6 is composed of a chip-type light emitting diode that emits an appropriate color, is arranged in the lighting chamber 34 on the circuit board 4, and is composed of a light emitting body that supplies illumination light to the operation / warning light 21b.

A method of adhering the cover panel 1 and the display 2 will be described with reference to FIG. First, the display 2 is set in the rear jig 200 with the opening 23a facing the front. Next, the transparent resin sheet 5 is attached on the display element 21 inside the opening 23a. Next, the cover panel 1 is set on the front jig 300 arranged in front of the rear jig 200.

Next, in the camera 400 arranged in front of the front jig 300, the x and y coordinates of the vertices P1 and P2 (the horizontal axis of the Cartesian coordinate system when the cover panel 1 is viewed from the normal direction is the x-axis, Read the (coordinates) value when the vertical axis is the y-axis. Using half the value of the width dimension W1 in the left-right direction of the first positioning hole 13 as the value of the apex P1, the axis L1 which is the center position of the first positioning hole 13 in the left-right direction can be calculated.

Further, from the value of the apex P2, the axis L2 which is the center position in the left-right direction of the second positioning hole 14 shown in FIG. 4 can be calculated by using the value of half of the width dimension W2 in the vertical direction of the second positioning hole 14. By providing the right-angled portions 13a and 14a colored by the light-shielding layer 12 such as the first right-angled colored portion 12d and the second right-angled colored portion 12f, the apex is read by the camera 400 like the apex P1 and the apex P2, and the image is imaged. It becomes possible to detect the position by processing.

For the vertical and horizontal positions C where the display 2 of the cover panel 1 can be attached with high position accuracy, the difference is calculated from the calculated current vertical and horizontal positions of the shaft L1 and the shaft L2, and the front jig is according to the difference. It is determined by moving 300 up, down, left and right. After that, when the front jig 300 moves to the rear jig 200, the cover panel 1 comes into contact with and adheres to the transparent resin sheet 5, and the adhesion between the cover panel 1 and the display 2 is completed.

That is, for the position of the cover panel 1, the positions of the axes L1 and L2 are calculated from the positions of the vertices P1 and P2 detected by the camera 400, and the optimum position of the cover panel 1 is adjusted from the positions of the axes L1 and L2. It is decided. In this way, by reading the positions of the vertices P1 and P2, which are a part of the outer shape of the cover panel 1, and adjusting the position of the cover panel 1, the cover panel 1 and the display 2 can be attached with high position accuracy. Can be done.

The position of the display 2 with respect to the recess 33 is determined by the position accuracy of the cover panel 1 and the display 2 and the position accuracy of the cover panel 1 and the case body 3. The positional accuracy between the cover panel 1 and the display 2 is as described above. The positioning accuracy of the cover panel 1 and the case body 3 is determined by the first positioning pin 31 and the second positioning pin 32 of the case body 3 and the first positioning hole 13 and the second positioning hole 14 of the cover panel 1. That is, by improving the positional accuracy between the cover panel 1 and the display device 2, the gap G between the recess 33 and the display device 2 can be reduced, and the outer shape of the display device 100 can be reduced.

The positions of the vertices P1 and P2 are positions formed in the first positioning holes 13 and the second positioning holes 14 of the cover panel 1. As a result, the first positioning holes 13 and the second positioning are located between the positions of the axes L1 and L2 used when determining the position of the cover panel 1 and the positions of the vertices P1 and P2 used when calculating this position. Since only one element of the width dimensions W1 and W2 of the hole 14 is interposed, the calculation error of the axes L1 and L2 can be minimized, and the cover panel 1 and the display 2 can be attached with high positional accuracy. ..

The positions of the vertices P1 and P2 are positions formed in the first positioning holes 13 and the second positioning holes 14 of the cover panel 1. As a result, the first positioning holes 13 and the second positioning are located between the positions of the axes L1 and L2 used when determining the position of the cover panel 1 and the positions of the vertices P1 and P2 used when calculating this position. Since only one element of the width dimensions W1 and W2 of the hole 14 is interposed, the calculation error of the axes L1 and L2 can be minimized, and the cover panel 1 and the display 2 can be attached with high positional accuracy. ..

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. For example, the first positioning hole 13 was formed in a notched shape, but as shown in FIG. 6, it may be formed in a closed hole-shaped positioning hole 15 and a right-angled portion 15a may be formed therein. Good.

The present disclosure relates to display devices, and can be applied to, for example, instrument devices for vehicles mounted on automobiles, motorcycles, or moving objects equipped with agricultural machinery and construction machinery.

1 Cover panel (protective member)
11 Base material 12 Light-shielding layer 12d First right-angled colored part (colored part)
12f 2nd right angle coloring part (coloring part)
13 1st positioning hole 13a 1st right angle part 14 2nd positioning hole 14a 2nd right angle part 2 Display (display means)
21 Display element 21a Display area 3 Case body 31 1st positioning pin 32 2nd positioning pin 33 Recessed 34 Lighting room 35 Mounting surface 4 Circuit board 5 Transparent resin sheet (transparent resin layer)
6 Light emitting element 7 Screw G Gap L1 Axis L2 Axis P1 Vertex P2 Vertex W1 Width Dimension W2 Width Dimension

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 transparent resin layer that fills the gap formed between the display means and the protective member and adheres the display means and the protective member.
A case body that supports the protective member behind and
In a display device that has at least
The protective member is a display device having a notch or a hole-shaped positioning portion for positioning with the case body, and the positioning portion has a right-angled portion formed at a right angle. The display device according to claim 1, wherein the right-angled portion has a colored portion that is colored and formed. The display device according to claim 2, wherein the protective member has a transparent portion that is transparently formed with a constant width around the positioning portion. The display device according to claim 3, wherein the transparent portion is not formed in the right-angled portion. The display device according to claim 1, wherein the case body has a recess formed by providing a gap with the display device.

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