JP2019023702A - Display - Google Patents

Abstract

To provide a display that can improve designability.SOLUTION: A display comprises: a display unit 10 that includes a display screen 11 and a front bezel 15 covering an outer edge of the display screen 11; a circuit board 20 that is arranged at a back surface side of the display unit 10, and includes a projection part 22 projecting from the display unit 10 in a surface direction of the display screen 11 and a light source 25 provided on the projection part 22; a light guide body 70 that guides light from the light source 25 onto the front bezel 15; and a protective panel 60 that covers the display unit 10 and has a translucent part 63 at a position corresponding to the front bezel 15.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display device mounted on a vehicle or the like.

  Vehicles such as automobiles and motorcycles are equipped with a display device as an instrument. For example, the display device of Patent Document 1 houses a display unit having a display screen over almost the entire area on the front side, a hard circuit board arranged on the back side of the display unit, and the display unit and the circuit board. And an outer case.

  Further, the display device has a protective panel on the front side of the display unit and an intermediate case for holding the display unit in the case.

JP 2017-40767 A

  The display unit is held in the outer case and held in the outer case, and the outer periphery of the display unit is covered by the middle case. On the front side of the display unit, the outer periphery of the display screen is covered with a front bezel. For this reason, in order to prevent the front bezel and the middle case from being visually recognized by the user, the outer periphery of the display screen of the display unit in the protective panel is shielded from light by providing a black print layer.

  Here, when the display screen is displaying black, the black level (brightness and chromaticity difference) differs from the black print layer of the protection panel, so the boundary between the display screen and the black print layer on the periphery of the display screen stands out. End up. As a result, the display device has a problem of deteriorating the quality of the entire display device or degrading design from a seamless viewpoint.

  The present invention has been made in consideration of such circumstances, and an object thereof is to provide a display device capable of improving design.

  In order to solve the above-described problem, the display device according to the present invention is disposed on the back side of the display unit, the display unit having a display screen, and a front bezel that covers an outer edge of the display screen. A circuit board having a protrusion protruding from the display unit in the surface direction of the screen; and a light source provided on the protrusion; a light guide that guides light from the light source to the front bezel; and the display A protective panel that covers the unit and has a translucent portion at a position corresponding to the front bezel.

  In the display device according to the present invention, the design can be improved.

1 is a perspective view showing an overall configuration of an embodiment of a display device according to the present invention. The disassembled perspective view of the main body of the display apparatus of FIG. Sectional drawing which follows the III-III line of FIG. Sectional drawing which shows especially a light guide. Sectional drawing of the display apparatus as a comparative example. Sectional drawing which shows especially the light guide which has a diffusion film.

  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 is mounted on a vehicle such as an automobile or a motorcycle, a ship, or an agricultural machine.

  FIG. 1 is a perspective view showing an overall configuration of an embodiment of a display device according to the present invention.

  FIG. 2 is an exploded perspective view of the main body 3 of the display device 1 of FIG.

  3 is a cross-sectional view taken along line III-III in FIG.

  FIG. 4 is a cross-sectional view specifically showing the light guide 70.

  In the following description, “front surface” means the near side surface in FIG. 1 and the viewing side surface of the protective panel 60 in the normal direction, and “rear surface” means the far side surface in FIG.

  The display device 1 includes a base 2 and a main body 3. The base 2 is a base that supports the main body 3 and is a part that is attached to a vehicle or the like. The main body 3 includes a display unit 10, a circuit board 20, a rigid plate 30, an outer case 40, an intermediate case 50, a protection panel 60, a light guide 70, and a transparent resin layer 80. Yes.

  The display unit 10 has a display screen 11 and a boss 12. The display screen 11 is a TFT (Thin Film Transistor) type liquid crystal display panel. The display screen 11 displays an image for notifying a predetermined measurement amount (for example, vehicle speed). The boss 12 is provided on the back surface facing the front surface on which the display screen 11 is provided. The boss 12 is formed in a case that accommodates, for example, the display screen 11 or a backlight module (not shown). The boss 12 has a screw hole when the rigid plate 30 is screwed to the display unit 10. In the present embodiment, the display unit 10 has four bosses 12. The display unit 10 also has a front bezel 15 that covers the outer edge of the display screen 11. The front bezel 15 is a metal frame having an L-shaped cross section and is provided as a restraint for the display screen 11.

  The circuit board 20 is disposed on the back side of the display unit 10. The circuit board 20 has a wiring pattern formed on a hard base material. The circuit board 20 includes a microcomputer that drives the display unit 10 and a flexible printed board that is electrically connected to the display unit 10. The circuit board 20 has a through hole 21 through which the boss 12 of the display unit 10 passes. Further, the circuit board 20 has a protruding portion 22 that protrudes from the display unit 10 in the surface direction of the display screen 11 (the XY surface direction in FIG. 3). The circuit board 20 has a light source 25 provided on the protrusion 22. The circuit board 20 also has a light source (not shown) for a warning light different from the light source 25.

  The rigid plate 30 (hereinafter referred to as “plate 30”) is disposed on the back side of the circuit board 20 so as to cover the display unit 10. The plate 30 is provided for holding and fixing the display unit 10. The plate 30 is preferably a thin metal plate which is a rigid thin plate from the viewpoint of protecting the display unit 10 and reducing the thickness of the display device 1. The plate 30 has a screw hole 31 and a step portion 32. The screw hole 31 is a hole for being screwed to the boss 12 by a screw 33. The stepped portion 32 abuts the protruding portion 22 of the circuit board 20 along the surface direction (XY surface direction). The step portion 32 has a step that approaches the direction of the display unit 10 with respect to the main region 34 that covers the display unit 10. For this reason, the distance (Z direction distance) between the protection panel 60 and the step portion 32 is smaller than the distance (Z direction distance) between the protection panel 60 and the main region 34.

  The outer case 40 has an upper case 41 and a lower case 42 made of, for example, a synthetic resin, and forms an outline of the display device 1. The outer case 40 has a housing portion 43 that houses the display unit 10, the circuit board 20, and the plate 30. The outer case 40 has a display unit area 45 and a display unit outer area 46. The display unit area 45 is an area where the display unit 10 is located in a plane parallel to the plane direction of the display screen 11 (in the XY plane). The display unit outside region 46 is a region surrounding the display unit region 45 located outside the display unit region 45 in the XY plane parallel to the surface direction of the display screen 11. The outer case 40 is formed such that the depth of the accommodating portion 43 of the display unit outer region 46 is smaller than the depth of the display unit region 45. That is, the back surface 48 of the outer case 40 has the inclined portion 49 so that the depth decreases in the direction from the center toward the outer edge. As shown in FIG. 3, the back surface 48 of the outer case 40 is flat in the display unit region 45 and is inclined by an inclined portion 49 in the display unit outer region 46.

  The middle case 50 holds the display unit 10 and the circuit board 20 in the outer case 40. The middle case 50 has a cylindrical illumination chamber 51 that surrounds the light source for the warning light of the circuit board 20. The warning lamp is displayed on a warning display section (not shown) provided on the outer periphery of the display screen 11 on the protective panel 60, and indicates various warnings by symbols and the like. The illumination chamber 51 guides light emitted from the light source to the warning display unit.

  The protection panel 60 is a transparent substrate provided on the front side of the display unit 10 and covers the opening of the outer case 40. The protective panel 60 has a low reflection layer, a light shielding layer 62, a smoke layer 63, and the like on the front surface or the back surface of the transparent substrate 61. Specifically, the low reflection layer is provided on the entire front surface of the protective panel 60. The light shielding layer 62 is formed on the back surface of the protective panel 60 by black printing so that the front bezel 15 and the middle case 50 are not visually recognized by the user. Further, the smoke layer 63 as a light transmitting portion is provided at a position substantially corresponding to the front bezel 15. The smoke layer 63 is formed on the back surface of the protective panel 60 by smoke printing in order to reduce the transmittance so that the light guided from the light guide 70 is transmitted while the inside is not visually recognized. The smoke layer 63 (and the light guide 70 and the light source 25) may be provided at a position corresponding to at least one side of the front bezel 15 on the left, right, top and bottom. Provided. The protective panel 60 may be a smoke-like base material. Further, the protective panel 60 may be formed integrally with the upper case 41 by a method such as insert molding.

  The upper case 41 and the protective panel 60 are bonded by an adhesive sheet 55 having an adhesive layer on both sides. Further, the middle case 50 and the protective panel 60 are bonded by an adhesive sheet 55.

  The light guide 70 is provided in the light emitting direction of the light source 25, guides the light from the light source 25 to the front bezel 15, and illuminates the protective panel 60 on the front bezel 15. As shown in FIG. 2, the light guide 70 has a length corresponding to one side of the front bezel 15. The light guide 70 has a rising portion 71, a bent portion 72, and a protrusion 73. The rising portion 71 extends and extends in a direction substantially perpendicular to the surface direction of the circuit board 20. The bent portion 72 has a smaller thickness than the rising portion 71 and is bent from the rising portion 71 toward the front bezel 15. The bent portion 72 is located between the protective panel 60 and the front bezel 15. For example, two protrusions 73 are provided on the end surface of the rising portion 71. The light guide 70 is inserted and positioned in the hole provided in the middle case 50 and the circuit board 20 by the protrusion 73 and is fixed.

  The bent portion 72 is sandwiched between the front bezel 15 and the protective panel 60 and is fixed in surface contact or line contact. The bent portion 72 may be in contact with the protective panel 60 via a cushion member. Further, the bent portion 72 is in contact with the front bezel 15 through the reflective film 90. The reflective film 90 is a film having a substantially L-shaped cross section that covers the surface of the bent portion 72 facing the front bezel 15 and the tip 75 and reflects and does not transmit light emitted from the light guide 70. The reflective film 90 is directly attached to the bent part 72. Further, the reflective film 90 may be fixed by being attached to the front bezel 15 by the adhesive layer 91. The reflective film 90 reflects the light emitted from the facing surface and the tip 75 of the front bezel 15, so that the brightness of the illumination can be improved and the influence of the light of the light source 25 on the display screen 11 can be suppressed. It is also conceivable to shield light with a resin-molded case or the like instead of the reflective film 90. However, since the distance between the display screen 11 and the protective panel 60 increases with the thickness of the case, it is preferable to shield the light with a film such as the reflective film 90.

  Further, since the distance between the display unit 10 and the protective panel 60 is preferably small, the thickness of the bent portion 72 is preferably small. The dimensions of the light guide 70 are determined based on the light guide distance and manufacturing restrictions. For example, the thickness of the end surface of the rising portion 71 can be 3 mm, and the thickness of the tip 75 of the bent portion 72 can be 1 mm.

  The transparent resin layer 80 bonds the protective panel 60 and the display screen 11 together. In other words, the protection panel 60 and the display screen 11 are fixed by optical carving (direct bonding). The transparent resin layer 80 suppresses internal reflection between the back surface of the protection panel 60 and the front surface of the display screen 11, and suppresses the display screen 11 from being viewed deeply due to the internal reflection. Further, since the transparent resin layer 80 fixes the display unit 10 and the protection panel 60 in the Z direction, it is possible to suppress the generation of abnormal noise due to contact under vibration conditions. The transparent resin layer 80 is a colorless and transparent sheet-like adhesive, for example. In the optical carving, a UV curable resin (resin material) such as an acrylic resin is used as an adhesive (bonding) material.

  The transparent resin layer 80 is disposed so as not to contact the tip 75 of the bent portion 72 and the reflective film 90. When the transparent resin layer 80 is OCR (Optical Clear Adhesive Resin), it has a characteristic that the volume shrinks when cured by UV irradiation or heat. For this reason, when the transparent resin layer 80 and the tip 75 are in contact with each other, stress due to curing shrinkage is generated, the tip 75 is pulled, and the light guide body 70 may be damaged. When the transparent resin layer 80 is an OCA (Optical Clear Adhesive Tape), if the transparent resin layer 80 and the tip 75 are in contact with each other, the light guide 70 is similarly expanded along with the expansion and contraction of the transparent resin layer 80 at the time of bonding. There is a risk of damage.

  The display device 1 in this embodiment can illuminate the protective panel 60 on the front bezel 15 by including the light source 25 and the light guide 70. Thereby, the quality of the entire display device 1 can be improved, and the design can be improved. Hereinafter, the effect of the display device 1 will be described using a comparative example.

  FIG. 5 is a cross-sectional view of a display device 101 as a comparative example. The outer periphery (outside the front bezel 115) of the display screen 111 of the display unit 110 is shielded from light by providing a light shielding layer 162 on the protective panel 160. However, when the display screen 111 displays black, the black degree (brightness / chrominance difference) between the light shielding layer 162 and the display screen 111 is different, so the boundary between the display screen 111 and its outer periphery (the light shielding layer 162). Will stand out. Further, when the area of the light shielding layer 162 is large (wide), the difference in blackness tends to stand out compared to the case where the area is small.

  On the other hand, the display device 1 in the present embodiment illuminates the protective panel 60 on the front bezel 15. Thereby, the brightness and chromaticity difference between the illumination and the light shielding layer 62 can be impressed to the user, and the difference in the degree of black between the display screen 11 and the light shielding layer 62 can be reduced. Therefore, the display device 1 has a seamless feeling and can improve the design. In addition, the depth of the display screen 11 can be minimized by reducing the distance between the display unit 10 and the protective panel 60 in consideration of the thickness of the bent portion 72 of the light guide 70, and the design is good. Will not be damaged.

  Further, in the comparative example shown in FIG. 5, the display device 1 can effectively utilize the space on the front bezel 115 that was a dead space.

  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 bent portion 72 of the light guide 70 may be covered with a diffusion film instead of the reflective film 90.

  FIG. 6 is a cross-sectional view specifically showing the light guide 70 having the diffusion film 93.

  The bent portion 72 is in contact with the protective panel 60 through the diffusion film 93. The diffusion film 93 is an L-shaped film that covers the surface of the bent portion 72 facing the protective panel 60 and the tip 75 and diffuses the light emitted from the light guide 70. The diffusion film 93 is affixed to the bent part 72 by the adhesive layer 91, for example. The diffusion film 93 may be fixed to the protective panel 60 by the adhesive layer 91. The diffusion film 93 has a light shielding layer 95 at a position corresponding to the tip 75 of the bent portion 72. The light shielding layer 95 is a light shielding member that shields light in the direction of the display screen 11 emitted from the light guide 70. Since the diffusion film 93 diffuses the light emitted from the facing surface of the protective panel 60, the luminance of the illumination can be improved. Further, the light shielding layer 95 can suppress the influence of the light of the light source 25 on the display screen 11.

DESCRIPTION OF SYMBOLS 1,101 Display apparatus 2 Base 3 Main body 10,110 Display unit 11 Display screen 12 Boss 15,115 Front bezel 20,120 Circuit board 21 Through-hole 22 Projection part 25 Light source 30 Rigid plate (plate)
31 Screw hole 32 Step portion 33 Screw 34 Main region 40, 140 Outer case 41 Upper case 42 Lower case 43 Housing portion 45 Display unit region 46 Display unit outer region 48 Back surface 49 Inclined portion 50 Middle case 51 Lighting chamber 55 Adhesive sheet 60, 160 Protective panel 70 Light guide 80 Transparent resin layer 61 Transparent base material 62, 162 Light shielding layer 63 Smoke layer 71 Rising part 72 Bending part 73 Projection 75 Tip 90 Reflective film 91 Adhesive layer 93 Diffusion film 95 Light shielding layer

Claims (6)

A display unit comprising: a display screen; and a front bezel covering an outer edge of the display screen;
A circuit board disposed on the back side of the display unit and having a protrusion protruding from the display unit in the surface direction of the display screen, and a light source provided on the protrusion;
A light guide that guides light from the light source to the front bezel;
A display device comprising: a protective panel that covers the display unit and has a light transmitting portion at a position corresponding to the front bezel.   The display according to claim 1, wherein the light guide includes a rising portion that rises with respect to the surface of the circuit board, and a bent portion that is smaller in thickness than the rising portion and bends on the front bezel from the rising portion. apparatus.   The display device according to claim 2, wherein the bent portion is sandwiched and fixed between the front bezel and the protective panel. A transparent resin layer for bonding the protective panel and the display screen;
The display device according to claim 2, wherein a tip of the bent portion is not in contact with the transparent resin layer.   The display device according to claim 2, further comprising a reflective film that covers a surface of the bent portion facing the front bezel and a tip of the bent portion, and reflects and does not transmit light emitted from the light guide. A diffusion film that covers a surface of the bent portion facing the protective panel and diffuses light emitted from the light guide;
The display device according to claim 2, further comprising a light shielding member that shields light in a direction of the display screen that is emitted from a tip of the bent portion.

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