JP2019190953A - Display unit - Google Patents

Abstract

To provide a display unit which has a large display region and can improve visibility.SOLUTION: A display unit comprises: a translucent plate 40 having a translucent layer 41 transmitting light from a back side to a front side, an antireflective layer 42 provided on the side of the back 41c of the translucent layer 41 and having an outer edge 42b more inside than an outer edge 41b of the translucent layer 41, and a light shield layer 43 provided on a back side of the antireflective layer 42 to partition a light shield region 40d blocking the light transmitted through the translucent layer 41 with an outer edge 43b and an inner edge 43a, the inner edge 43a being more inside than the outer edge 42b of the antireflective layer 42, and the outer edge 43b being more inside a position aligned with an outer edge 41b of the translucent layer 41 or the outer edge 41b of the translucent layer 41; and a case 10 having an opening 10b covered with the translucent plate 40.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a display device.

  The display device allows a viewer such as a driver to visually recognize information via a display panel that displays an image or a translucent plate provided on the front side of the mechanical instrument. The translucent plate is a flat plate provided to protect the inside of the display device from intrusion of dust and the like.

JP 2017-32707 A

  The translucent plate has an antireflection layer for preventing reflection of external light on the translucent plate and a light shielding layer for partitioning a display area for visually recognizing information. The translucent plate is supported by a case or the like that forms the outline of the display device.

  Here, in order to provide a viewer with a lot of information, it is necessary to enlarge an area for displaying information. One of the methods is to narrow the area shielded by the light shielding layer and enlarge the display area. However, since it is necessary to hide the antireflection layer and the periphery of the case with the light shielding layer so that the peripheral edge of the case is not visually recognized through the translucent plate, it is difficult to narrow the light shielding region.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a display device that has a large display area and can improve visibility.

  In order to solve the above-described problem, a display device according to the present invention has a light-transmitting layer that transmits light from the back side to the front side, and is provided on the back side of the light-transmitting layer than the outer edge of the light-transmitting layer. An antireflection layer having an outer edge on the inner side, and a light-shielding region provided on the back side of the antireflection layer, which blocks light transmitted through the light-transmitting layer, is partitioned by an outer edge and an inner edge, and is located on the inner side of the outer edge of the antireflection layer And a light-shielding layer having the outer edge inside the outer edge of the light-transmitting layer, the light-transmitting plate covered with the light-transmitting plate. A case having an opening.

  The display device according to the present invention has a large display area and can improve visibility.

The front view which shows the display apparatus which is embodiment of the display apparatus which concerns on this invention. Sectional drawing which follows the II-II line of the display apparatus of FIG. Sectional drawing which follows the III-III line of the display apparatus of FIG. Sectional drawing which expanded especially the support part periphery of FIG. Sectional drawing corresponding to FIG. 2 of the display apparatus as a comparative example.

  Embodiments of a display device according to the present invention will be described with reference to the accompanying drawings. The display device according to the present invention can be applied to all display devices having a translucent plate arranged on the front surface of a device that displays information such as a mechanical instrument including a display panel, a dial, and a rotation pointer. For example, it is mounted on a vehicle such as an automobile or a motorcycle, a ship, an agricultural machine, or a construction machine. The display device according to the present invention is particularly affected by outside light such as a motorcycle, an agricultural machine, a construction machine, a ship, a snowmobile, a jet ski, etc., where the display device is exposed outdoors, and is required to have waterproofness and design. It is preferable to be used.

FIG. 1 is a front view showing a display device 1 which is an embodiment of a display device according to the present invention.
FIG. 2 is a cross-sectional view taken along line II-II of the display device 1 of FIG.
3 is a cross-sectional view taken along line III-III of the display device 1 of FIG.
FIG. 4 is a cross-sectional view in which the periphery of the support portion 15 in FIG. 2 is particularly enlarged.

  In the following description, the “front side” means the near side in FIG. 1 and the upper side (translucent plate 40 side) in FIGS. 2 and 3 and the side that is visible to the viewer (driver). “Back (rear) surface side” means the back side in FIG. 1 and the lower side in FIG. 2 and FIG. 3 (the circuit board 30 side with respect to the light transmitting plate 40).

  The display device 1 mainly includes a case 10, a display unit 20, a circuit board 30, and a translucent plate 40.

  The case 10 accommodates the display unit 20, the circuit board 30, and the translucent plate 40. The case 10 constitutes an outline (external appearance) of the display device 1. The case 10 has a middle case 12 (omitted in FIG. 2). The middle case 12 has a light shielding wall 13 that guides the emitted light surrounding the light source 31 on the circuit board 30. The light shielding wall 13 forms a cylindrical space with a wall that divides an illumination (light emission) region of the light source 31, and light passes through the cylindrical space. One end of the light shielding wall 13 (the surface facing the circuit board 30 of the middle case 12) is in contact with the circuit board 30, and the other end (the surface facing the light transmitting plate 40 of the middle case 12) is the light transmitting plate 40. Is in contact with the back surface 40b.

  The case 10 also has an opening 10 b that is covered with the translucent plate 40. The case 10 has a support portion 15 for accommodating the light transmitting plate 40 by exposing the front surface 40a of the light transmitting plate 40 in the opening 10b. The support portion 15 protrudes substantially vertically from the side wall 10 a having a surface direction in the front-rear direction of the case 10 toward the inside of the case 10. The support part 15 has the support surface 16 which is the area | region formed by the support surface inner edge 16a and the support surface outer edge 16b (FIG. 4) facing the back surface 40b of the translucent board 40. As shown in FIG. The support portion 15 (case 10) supports the light transmitting plate 40 by making surface contact with the back surface 40 b of the light transmitting plate 40 at the support surface 16.

  As shown in FIG. 4, the support surface outer edge 16b is formed at the end 15a of the support 15 connected to the side wall 10a. The support surface inner edge 16a is formed at the tip 15b of the support portion 15 projecting inward from the end portion 15a. In addition, the support surface 16 (support part 15) may be provided continuously along the translucent board 40, and may be provided intermittently. The support surface outer edge 16b is in a position substantially coincident with the light transmitting layer outer edge 41b and the light shielding layer outer edge 43b. The support surface inner edge 16a is on the inner side of the antireflection layer outer edge 42b and on the outer side of the light shielding layer inner edge 43a. That is, the light shielding layer 43 is provided across the support surface inner edge 16 a, and the support surface inner edge 16 a overlaps the light shielding layer 43.

  “Outside” refers to the outer surface side (left side in FIG. 4) of the case 10, and “inside” refers to the inner side (right side in FIG. 4) with respect to the outer surface of the case 10. “Outer edge” refers to the outer periphery and “inner edge” refers to the inner periphery.

  The display unit 20 (display panel) is disposed on the back side of the translucent plate 40 and the support surface 16 (support portion 15). The display unit 20 has a display panel and a backlight unit.

  The display panel is a TFT (Thin Film Transistor) type normally black type (black display when no voltage is applied) liquid crystal display panel. The display panel has a pair of surface glass substrates that enclose a liquid crystal layer. Transparent electrodes are formed on the pair of glass substrates with ITO (Indium Tin Oxide) or the like. Further, the display panel has a pair of surface polarizing plates (polarizing filters) arranged so as to sandwich the pair of surface glass substrates. The display panel is connected to the circuit board 30 via FPC (Flexible Printed Circuits). The display panel is controlled by the control unit of the circuit board 30 so that a driving voltage is applied to the liquid crystal layer through the transparent electrode. Thereby, the orientation of the liquid crystal molecules in the liquid crystal layer is controlled, and an image is displayed by changing the transmittance of each pixel of the display panel.

  The backlight unit is provided on the back side of the display panel. The backlight unit includes a light source substrate and a light guide, and illuminates the display panel from the back side. The light source board is mounted with a plurality of LEDs (Light Emitting Diodes) which are an example of a light source. The light source board is connected to the circuit board 30 via a flexible board such as an FPC. When a driving current is supplied, the LED emits light toward the display panel (light guide). The light guide guides the light emitted from the LED toward the display panel. The light guide is a transparent resin such as polymethyl methacrylate resin (PMMA) formed in a flat plate shape.

  The circuit board 30 mainly has a control unit for controlling the display unit 20 and the light source 31. The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and executes predetermined arithmetic processing according to a program written in the ROM, for example. For example, the control unit acquires vehicle speed, engine speed, various vehicle information, navigation information, and the like from an ECU (Electronic Control Unit) of the vehicle via various sensors. The control unit displays information on the display panel based on the acquired information. The light source 31 is, for example, an LED, emits light, and illuminates the translucent plate 40 from the back side of the translucent plate 40.

  The translucent plate 40 is a flat plate provided to protect the display unit 20 and the circuit board 30 inside the case 10 from intrusion of dust and the like. The light transmissive plate 40 includes a light transmissive layer 41, an antireflection layer 42, and a light shielding layer 43.

  The translucent layer 41 is made of a transparent resin such as PMMA, for example, and transmits light from the back side to the front side. The translucent layer 41 is a surface facing the viewer in the translucent plate 40. In addition, an AR (Anti-Reflective) coat may be applied to the front surface of the translucent layer 41 to further provide a reflection reduction effect. The AR coat is formed, for example, by vacuum deposition of magnesium fluoride or the like.

  The antireflection layer 42 prevents the visibility of the display panel from being deteriorated due to external light reflection by the interface between the back surface 41 c of the translucent layer 41 and the air. The antireflection layer 42 is an optical film having an antireflection function on one side (rear surface) realized by, for example, a moth-eye structure or a film whose refractive index and film thickness are controlled to cancel reflection. The antireflection layer 42 is provided integrally with the back surface 41c (FIG. 4) of the translucent layer 41 without any step. Specifically, the antireflection layer 42 is integrally formed on the back surface 40b side of the light transmitting layer 41 without a step by being insert-molded into the light transmitting layer 41 when the light transmitting layer 41 is injection molded. It has been.

  As shown in FIG. 4, the antireflection layer 42 has an antireflection layer outer edge 42b on the inner side of the translucent layer outer edge 41b. The outer edge 42 b of the antireflection layer is covered with a light shielding layer 43 on the back surface of the antireflection layer 42. The antireflection layer outer edge 42b is located inside the translucent layer outer edge 41b, and the antireflection layer outer edge 42b (the outer peripheral surface of the antireflection layer 42) is covered with the translucent layer 41, so that the visibility needs to be improved. In addition to the transparent region 40c (display region of the display panel), the antireflection layer 42 is not unnecessarily formed. Further, since an OCA (Optical Clear Adhesive Tape) or the like for attaching the antireflection layer 42 to the light transmitting layer 41 is not used, the optical characteristics of the light transmitting plate 40 can be improved.

  The antireflection layer 42 is preferably formed of a hydrophilic material in order to have antifogging performance. This is particularly effective when the display device 1 is exposed to the outdoors as in a motorcycle.

  The light shielding layer 43 shields the internal structure around the display unit 20 from being viewed from the viewer side. The light shielding layer 43 partitions a light shielding region 40d that shields light transmitted through the light transmitting layer 41 by a light shielding layer outer edge 43b and a light shielding layer inner edge 43a. That is, the light shielding layer 43 shields light with a certain width inward from the light shielding layer outer edge 43b. Further, the light shielding layer 43 partitions a light transmitting region 40c that transmits light by a light shielding layer inner edge 43a, and allows the display panel to be viewed as a display area inside the light shielding layer inner edge 43a.

  The light-shielding layer 43 is printed with black light-shielding ink on the back surface of the antireflection layer 42 and the back surface 41c of the translucent layer 41 located on the outer periphery of the antireflection layer 42, which is continuous with the back surface. Thus, the antireflection layer 42 (and the translucent layer 41) is provided on the back side. Since the light shielding layer 43 is a surface bonded to the support surface 16, it is preferable that the light shielding layer 43 be formed flat with ink having high adhesion to the support surface 16.

  The light shielding layer 43 has a light shielding layer inner edge 43a inside the antireflection layer outer edge 42b, and has a light shielding layer outer edge 43b at a position coincident with the light transmitting layer outer edge 41b. That is, the light shielding layer 43 is provided across the light transmitting layer 41 and the antireflection layer 42, and the outer edge 42 b of the antireflection layer overlaps the light shielding layer 43.

  Further, as shown in FIG. 3, the light shielding layer 43 has a design 45 such as a symbol formed in a letter shape. The design 45 is turned on when the light from the light source 31 irradiated from the back side of the light shielding layer 43 (translucent plate 40) is transmitted.

  In such a translucent plate 40, an antireflection layer 42 is integrally provided on the back surface 41 c of the translucent layer 41 without a step, and the translucent layer 41, the antireflection layer 42, and the back surface of the antireflection layer 42 are provided. A light shielding layer 43 is provided so as to straddle. That is, the outer edge 42 b of the antireflection layer (the boundary between the translucent layer 41 and the antireflection layer 42) overlaps the light shielding layer 43.

  The display apparatus 1 can make the antireflection layer outer edge 42b inconspicuous from the viewer by having such a light transmitting plate 40. Therefore, for example, as in the display device 100 as a comparative example shown in FIG. 5, compared to the case where the light transmitting plate 111, the light shielding layer 112, and the antireflection layer 113 are formed in this order from the front side. The width of the light shielding layer 112 can be reduced.

  That is, in the display device 100, the antireflection layer 113 that is not flat and cannot secure the bonding strength with the support surface 121 is provided on the rearmost surface of the translucent plate 101 by sticking or the like. However, in order to ensure the bonding strength between the translucent plate 101 and the support surface 121, it is necessary to provide a region where the flat light shielding layer 112 faces the support surface 121 on the back surface of the translucent plate 101. That is, the antireflection layer outer edge 113b needs to be located inside the support surface inner edge 121a.

  Further, the outer edge 113b of the antireflection layer needs to be inconspicuous from the viewer by being covered with the light shielding layer 112. For this reason, the light shielding layer inner edge 112a needs to be located inside the antireflection layer outer edge 113b. As a result, the width of the light shielding area 125b defined by the light shielding layer outer edge 112b and the light shielding layer inner edge 112a is increased, and as a result, the light transmitting area 125a (display area of the display panel) is reduced.

  On the other hand, in the display device 1 according to the present embodiment, the light shielding layer 43 is provided on the rearmost surface of the translucent plate 40, and the antireflection layer 42 is provided on the front surface of the light shielding layer 43. As a result, the position of the outer edge 42b of the antireflection layer can be determined regardless of the position of the inner edge 16a of the support surface (the bonding area between the support surface 16 and the light shielding layer 43), and the position of the inner edge 43a of the light shielding layer is also determined by the support surface. If it is inside the inner edge 16a, it can be determined freely. As a result, the width of the light shielding layer 43, in particular, the width of the light shielding layer 43 in the region (for example, FIG. 2) that does not have the design 45 and has an internal shielding function can be reduced. Therefore, the display device 1 can have a large display area (translucent area 40c), and can improve visibility and appearance.

  Further, since the outer edge 42b of the antireflection layer is not conspicuous by the light shielding layer 43 located on the back surface of the antireflection layer 42, the application error and dimensions are smaller than when the optical film (antireflection film) is attached to the translucent layer 41. The error can be absorbed. For example, in the case of the display device 100, it is necessary to design a required gap between the outer edge 113b of the antireflection layer and the inner edge 121a of the support surface in consideration of the sticking position shift. On the other hand, since the outer edge 42b of the antireflection layer is covered with the light shielding layer 43, the display device 1 can absorb some errors and can eliminate the need for high dimensional accuracy.

  Further, since the light shielding layer 43 is printed after the antireflection layer 42 is formed on the translucent layer 41, heat is not unnecessarily applied to the light shielding layer 43, and the ink flow that forms the light shielding layer 43 associated therewith is prevented. Moreover, it can reduce that the design 45 shift | deviates by position shift of a film, elongation of a film, etc. Further, since there is no step at the boundary between the light transmissive layer 41 and the antireflection layer 42, the printing of the light shielding layer 43 can be facilitated.

  In the display device 1, the antireflection layer 42 is also provided in the region of the design 45. Thereby, reflection of the translucent layer 41 in the region of the design 45 can be reduced, and visibility can be improved. That is, in the display device 1, when the design 45 is not displayed (illuminated), the antireflection layer 42 acts, and the boundary of the design 45 is not conspicuous based on the difference in reflectance with or without the light shielding layer 43. . Further, when the design 45 is displayed, the luminance can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, the antireflection layer 42 may be integrally provided without a step by transferring an antireflection shape such as a moth-eye structure to the back surface 41c of the translucent layer 41 using a mold. In this case, by forming the outer edge 42b of the antireflection layer on the inner side of the outer edge 41b of the translucent layer, the area for forming the moth-eye structure can be reduced, and the manufacturing cost of the mold or the like can be reduced.

  The light shielding layer 43 may have the light shielding layer outer edge 43b on the inner side of the light transmitting layer outer edge 41b as long as it covers the antireflection layer outer edge 42b from the back surface.

  The display panel is not limited to a liquid crystal display panel, and may be a display panel having another backlight.

  The light transmissive layer 41 and the antireflection layer 42 may be a smoke-colored semi-transmissive material.

DESCRIPTION OF SYMBOLS 1,100 Display apparatus 10 Case 10a Side wall 10b Opening 12 Middle case 13 Light-shielding wall 15 Support part 15a End part 15b Tip 16, 121 Support surface 16a, 121a Support surface inner edge 16b Support surface outer edge 20 Display unit 30 Circuit board 31 Light source 40, 101 light-transmitting plate 40a front surface 40b back surface 40c, 125a light-transmitting region 40d, 125b light-shielding region 41, 111 light-transmitting layer 41b light-transmitting layer outer edge 42, 113 anti-reflection layer 42b, 113b anti-reflection layer outer edge 43, 112 light-shielding layer 43a, 112a Light shielding layer inner edge 43b, 112b Light shielding layer outer edge 45 Design

Claims (6)

A translucent layer (41) for transmitting light from the back side to the front side, and provided on the back side (41c) side of the translucent layer (41) and inside the outer edge (41b) of the translucent layer (41) An antireflection layer (42) having an outer edge (42b) and a light shielding region (40d) provided on the back side of the antireflection layer (42) for blocking light transmitted through the light transmitting layer (41) are provided on the outer edge (43b). ) And an inner edge (43a), the inner edge (43a) is located inside the outer edge (42b) of the antireflection layer (42), and coincides with the outer edge (41b) of the light transmitting layer (41). A light-transmitting plate (40) having a light shielding layer (43) having the outer edge (43b) on the inner side of the position or the outer edge (41b) of the light-transmitting layer (41);
And a case (10) having an opening (10b) covered with the light transmissive plate (40).   The case (10) supports the light transmissive plate (40) so as to face the back surface (40b) of the light transmissive plate (40), and has an inner edge (outside the inner edge (43a) of the light shielding layer (43)). 2. Display device according to claim 1, having a support surface (16) with 16a).   The display device according to claim 1, further comprising a display panel (20) disposed on the back surface (40 b) side of the translucent plate (40).   The display device according to any one of claims 1 to 3, wherein the antireflection layer (42) is provided integrally with a back surface (41c) of the translucent layer (41) without a step.   The display device according to any one of claims 1 to 4, wherein the antireflection layer (42) is provided by insert molding on the light transmitting layer (41).   The display device according to any one of claims 1 to 4, wherein the antireflection layer (42) is provided by forming an antireflection shape on a back surface (41c) of the translucent layer (41).

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