JP2018179741A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device in which shrinkage of the light guide part and the light emission part of a light guide member extending from the outer periphery of a wiring board can be prevented.SOLUTION: The display device includes: a translucent panel 10; a wiring board 50 behind the panel 10; a light source 51 connected to the wiring board 50; and a light guide member 70 having an incident part 71 to which light is entered from the light source 51, a base part 72 extending from the incident part 71 to the outer direction of the wiring board 50, an extension part 73 extending from the base part 72 to the panel 10, and a light emission part 74 for emitting light from the extension part 73 to the light source 51 to the panel 10, the light emission part 74 being in the shape of a stair.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device mounted on a vehicle such as a construction machine.

  Conventionally, for this type of display device, for example, the one described in Patent Document 1 below is known. The display device described in Patent Document 1 consists of a meter for a vehicle mounted on a vehicle, and a pointer type display unit including a speedometer that displays a vehicle speed by a pointer and a display plate, and a pointer type display unit. And a plurality of indicator panels provided on a display board on an outer periphery of the pointer type display unit.

  In this vehicle instrument, in order to reduce the cost of the wiring board disposed behind the display board, the wiring board is not extended to the area corresponding to the back of the indicator board, and the external dimensions of the wiring board are reduced. ing. Therefore, a light guide member is used to illuminate the indicator panel. The light guiding member includes an incident surface (inner end surface) on which light of a light source provided on the outer periphery of the wiring substrate is incident, a base extending from the incident surface to the outer periphery of the wiring substrate, and guiding the incident light It extends from the front to the indicator panel and is provided with a single surface to face in parallel with the design of the indicator panel, an extension that guides the guided light toward the indicator panel, and reflects And an emitting surface (extending end surface) for emitting the emitted light to the indicator panel.

JP, 2002-372441, A

  By the way, in this vehicle instrument, since the exit surface is provided in a single plane so as to face in parallel with the design of the indicator panel, the cross-sectional area of the extension portion becomes wide, and as a result, the extension portion Since the wall thickness is large, sink marks (dimples: dents caused by molding shrinkage after molding of resin material) are generated on the light emitting surface and the extension part, and light reflection efficiency and light emission efficiency decrease. there were.

  Therefore, in order to address the above problems, the present invention provides a display device capable of preventing sink marks of the light guide portion (extension portion) and the emission portion of the light guide member extending from the outer periphery of the wiring substrate. Purpose.

  According to the present invention, a light-transmissive panel 10, a wiring board 50 disposed behind the panel 10, a light source 51 connected to the wiring board 50, and an incident portion 71 on which the light of the light source 51 is incident A base 72 extending outward of the wiring substrate 50 from the incident portion 71, an extension 73 extending from the base 72 toward the panel 10, and a portion of the light source 51 extending from the extension 73 In a display device provided with a light guide member 70 having a light emitting portion 74 for emitting light to the panel 10, the light emitting portion 74 has a step shape.

  Further, the extending portion 73 of the present invention has a reflecting portion 73a for reflecting the light of the light source 51 toward the emitting portion 74, and the emitting portion 74 is a step substantially parallel to the reflecting portion 73a. It is characterized by being a shape.

  The present invention further includes a display element 32 disposed between the panel 10 and the wiring board 50 and capable of displaying predetermined information 31, and the wiring board 50 has a smaller area in the surface direction than the display means 30. It is characterized in that it is formed and disposed inside the display means 30.

  Further, the light source 51 of the present invention is disposed at the rear of the wiring board 50, and the base 72 has a step portion 72a formed to approach the panel 10 from the rear of the wiring board 50. Do.

  Further, the present invention is characterized in that it has a transparent resin layer 20 which is filled in a gap formed between the panel 10 and the display means 30 and which joins the panel 10 and the display means 30.

  According to the present invention, it is possible to provide a display device capable of achieving the intended purpose and capable of enhancing the illumination efficiency of the indicator.

FIG. 1 is a front view of a display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line A-A in FIG. FIG. 3 is an enlarged cross-sectional view around a light guide member 70 in FIG. 2; The expanded sectional view which shows the detail of Z part in FIG. 1 which abbreviate | omitted the front panel 10 and the display means 30. FIG.

  Hereinafter, a case where the embodiment of the present invention is applied to a vehicle instrument D mounted on a vehicle will be described as an example based on FIGS. 1 to 4. Moreover, front and rear, right and left of the vehicle meter D are shown by the arrow in each figure.

  1 and 2, the vehicle instrument D as the display device according to the first embodiment of the present invention includes a display monitor unit 100 for displaying various information disposed at the center, and a plurality of the display monitor units 100 on the left side. And an indicator unit 200 disposed.

  The display monitor unit 100 is disposed on the front panel (panel) 10 having the monitor opening 12a, the wiring board 50 disposed behind the front panel 10, and the monitor opening 12a, and displays predetermined information 31 as an image. Display element 32 having a display area 32a which can be displayed, the display element 32 and being formed between the display means 30 disposed between the front panel 10 and the wiring substrate 50, the front panel 10 and the display means 30 Space between the front panel 10 and the display means 30, and the outer peripheral end 13 of the front panel 10, and the display means 30 and the wiring board 50 are housed inside, and wiring A case body 40 for fixing and holding the substrate 50, a double-sided tape T for joining the front panel 10 and the case body 40, and a cover body 60 covering an opening at the rear of the case body 40 It is made.

  The indicator portion 200 includes a first indicator design portion 12b provided at the upper left corner of the front panel 10, a second indicator design portion 12c disposed below the first indicator design 12b of the front panel 10, and a wiring A plurality of light sources 51 mounted around the rear periphery of the substrate 50, and a plurality of light guide members 70 for guiding the light of the plurality of light sources 51 to the first and second indicator design portions 12b and 12c, respectively. Ru.

  The front panel 10 is formed by printing a black solvent ink on the rear surface of the light transmitting substrate 11 and forming a light shielding layer on the light transmitting substrate 11 and a flat light transmitting substrate 11 made of light transmitting inorganic glass as a base material. And an opaque portion 12.

  In the non-transmissive portion 12, a monitor opening 12 a is formed at a position corresponding to the display area 32 a, in which the non-transmissive portion 12 is not formed. The opaque portion 12 has a function as a concealing portion such that the metal frame body 33 is in an invisible state when the vehicle instrument D is viewed from the front (normal view).

  In addition, the opaque portion 12 is continuously provided not only on the display monitor portion 100 side but also on the indicator portion 200 side, and in the indicator portion 200, the opaque portion 12 is removed and the first and second printing is performed. The indicator design parts 12b and 12c are formed.

  As shown in FIG. 3, the display means 30 illuminates the substantially rectangular display element 32 provided with the display area 32a inside the frame body 33 forming the exterior, and although not shown, for illuminating the display element 32. Light emitting element, a light guide for diffusing light from the light emitting element, a source line driving circuit for driving a source line (signal line) of the display element 32, and a gate line (scanning line) for the display element 32 A gate line drive circuit, a printed circuit board on which the source line drive circuit, the gate line drive circuit, the light emitting element and the like are mounted, and a substantially flat white case for supporting a light guide are housed.

  If necessary, one or more optical members (for example, a diffusion sheet or a prism sheet) for back-lighting the display element 32 substantially uniformly may be disposed behind the display element 32.

  The display element 32 is, for example, a dot matrix type TFT (Thin Film Transistor) type liquid crystal panel having a plurality of pixels, and is mounted on each part outside the vehicle, such as a back monitor as shown in FIG. A display area 32a is provided which can display predetermined information 31 which is an image captured by a camera.

  The frame body 33 is formed into a single casing by superposing a frame body obtained by press-forming a metal conductive material such as aluminum or stainless steel into a substantially frame shape.

  The display means 30 has a flexible printed circuit (FPC) which is exposed from the rear surface of the display means 30 to the outside. The flexible wiring board F passes through the first through holes 53 provided in the wiring substrate 50, and is connected to the connector 52 mounted on the rear surface of the wiring substrate 50, thereby energizing the display means 30 and the wiring substrate 50. . Further, a wiring cord C is connected to a boss 33 a provided on the rear surface of the frame body 33 by a fixing tool such as a screw V. Then, the other end of the wiring cord C passes through a second through hole 54 provided in the wiring substrate 50, and is connected to the rear surface of the wiring substrate 50 by a fixing tool such as a screw V. By being formed in this manner, static electricity charged on the frame body 33 can be dropped to the ground pattern of the wiring substrate 50.

  The transparent resin layer 20 is made of a gel-like optical adhesive (for example, liquid silicone adhesive) filled in the space formed between the front panel 10 and the display means 30, and the thickness thereof is 300 to 1000 μm. And the refractive index is set to 1.45 to 1.55, which is set to a refractive index substantially equal to the refractive index of the translucent substrate 11 formed of inorganic glass. .

  Further, in bonding the front panel 10 and the display means 30, the transparent resin layer 20 is applied to at least one of the front panel 10 and the display means 30, and thereafter, the transparent resin layer 20 is used to By bonding (UV curing) the transparent resin layer 20 after bonding the display means 30 to each other, it is possible to obtain the display monitor unit 100 including the front panel 10, the transparent resin layer 20, and the display means 30. .

  The wiring board 50 is made of a hard wiring board obtained by applying a wiring pattern to a glass epoxy base material such as FR-4 (Flame Retardant-4), for example, and a light source 51 and a connector are provided on the rear surface (surface opposite to display output). 52 Although not shown in the drawings, for driving and controlling the light source 51 and instructing the display element 32 provided in the display monitor unit 100 to perform display operation and lighting the light emitting element provided in the display monitor unit 100 And various circuit parts such as a control means, a resistor, and a capacitor, which output another command signal, are connected conductively to the wiring pattern.

  The wiring substrate 50 is disposed behind the display means 30, and the area in the surface direction is smaller than the area in the surface direction of the display means 30, and is disposed inside the display means 30. That is, the mounting surface of the wiring board 50 is smaller than the outer shape of the display unit 30 in the display surface direction, and is arranged such that it can not be viewed by the display unit 30 when viewed from the front (normal view).

  The light source 51 includes a vertical light emitting chip type light emitting diode (LED: Light Emitting Diode) that emits light of an arbitrary color in a direction orthogonal to the surface direction of the wiring substrate 50, and has a first and second indicator designs The light which illuminates the sections 12b and 12c is emitted. Further, the light sources 51 have a number corresponding to the number of the first and second indicator design parts 12 b and 12 c. The light source 51 is disposed on the rear surface of the outer periphery of the wiring substrate 50 near the first and second indicator design portions 12 b and 12 c. Further, the light source 51 is disposed to emit light toward the first and second indicator design portions 12b and 12c.

  The case body 40 is made of, for example, a composite resin of a black ABS (acrylonitrile-butadiene-styrene copolymer synthesis) resin and an AES (acrylonitrile-ethylene-styrene copolymer synthesis) resin, and is formed in a frame shape having an open front and rear. . Further, the case body 40 has a receiving portion 41 at the end of the front opening, and the receiving portion 41 supports the front panel 10. Further, the double-sided tape T is attached to the receiving portion 41, and the outer peripheral end 13 of the front panel 10 and the receiving portion 41 are joined. By being formed in this manner, the display means 30 is suspended and held by the front panel 10. Further, the case body 40 is formed with a bottom portion 42 in which an opening at the rear extends inward in an L shape. The wiring board 50 is fixedly held on the case body 40 from the rear of the bottom surface portion 42 by a plurality of fasteners such as screws V or the like.

  The cover body 60 is made of, for example, a black ABS resin, and is formed in a box shape whose front is open. Further, the cover body 60 covers the opening at the rear of the case body 40, and is fixed to the case body 40 from the rear of the cover body 60 with a plurality of fasteners such as screws V. Thus, the vehicle instrument D is a closed case by the front panel 10, the case body 40, and the cover body 60.

  As shown in FIGS. 2 to 4, the light guide member 70 is made of, for example, transparent PMMA (acrylic) resin or the like, and when the light source 51 is turned on, the light guide member 70 receives the irradiation light and enters the light into the light guide member 70 A surface (incident portion) 71, a base 72 extending from the incident surface 71 in the direction of the first and second indicator design portions 12b and 12c, and an extension 73 extending from the base 72 toward the front panel 10 And an emitting surface (emitting portion) 74 for emitting the light of the light source 51 from the extending portion 73 toward the front panel 10. In addition, one light guide member 70 is provided for each of the first indicator design portion 12 b and the second indicator design portion 12 c.

  The base portion 72 once extends in a direction substantially parallel to the surface direction of the wiring substrate 50, and then extends obliquely toward the rear surface of the display means 30, and then extends substantially parallel to the surface direction of the rear surface of the display means 30. Finally, there is a step 72a leading to the bottom 42 of the case body 40. By being formed in this manner, the gap between the rear surface of the display means 30 and the front surface of the base 72 can be reduced, and the gap between the rear surface of the base 72 and the front surface of the bottom portion 42 can be reduced. The thickness of the outer shape of the measuring instrument device D is reduced, and a display device having a good appearance and good merchandiseability can be provided.

  As shown in FIG. 3, the extension part 73 has a reflection surface (reflection part) 73 a that reflects light from the base 72 toward the front panel 10 on the rear surface. The exit surface 74 is formed in a step shape on an end face substantially parallel to the reflection surface 73a. That is, in the corner portion 74a corresponding to the step nose of the step, the surface connecting the corner portion 74a and the reflective surface 73a are formed substantially in parallel. The emission surface 74 corresponds to a step board of the stairs, and a plurality of surfaces of each step are set to face the front panel 10 substantially in parallel. Further, the vertical surface 74b corresponding to the kick plate of the stairs is set to the draft angle of the molding.

  By forming in this manner, the thickness of the extension portion 73 can be made substantially constant with respect to the reflective surface 73a, so that generation of sink marks at the time of molding in the output surface 74 and the reflective surface 73a can be prevented. A highly efficient display device can be provided. Further, since there is no need to arrange the wiring board 50 behind the first indicator design part 12b and the second indicator design part 12c, the cost increase of the wiring board 50 is prevented, and a low cost display device is provided. be able to.

  Further, as shown in FIG. 4, the light guide member 70 has a fixing portion 75 which protrudes from the side surface of the base portion 72 or the extension portion 73 so as to face the bottom surface portion 42. The fixing portion 75 is provided with a through hole (not shown) into which the screw V is inserted, and is fixedly held on the bottom portion 42 from the front of the fixing portion 75 by a fixing tool such as the screw V. Further, the plurality of light guide members 70 are connected and integrated by a square rod-like connecting portion 76 provided on the rear surface of the base portion 72, and are integrally molded by the same mold. By forming in this manner, the number of molds can be reduced, and a low-priced display device can be provided.

  In addition, the case body 40 has a partition wall 43 that divides between the first indicator design portion 12 b and the second indicator design portion 12 c and between the plurality of light guide members 70. By being formed in this manner, light leakage between the first indicator design portion 12 b and the second indicator design portion 12 c is prevented by the partition wall 43. By being formed in this manner, a display device with high illumination quality can be provided.

  Further, the bottom surface portion 42 is formed along the reflection surface 73a. Since the chamfered portion 44 can be formed on the outer periphery of the rear surface of the case body 40 by being formed in this manner, the appearance is reduced, and the appearance of the display device having a high commercial value with a thin appearance. can do.

  Further, the wiring substrate 50 is mounted with the respective components only on the rear side. Since the wiring substrate 50 does not need to mount each component on the front surface by being formed in this manner, the cost increase due to double-sided mounting can be prevented, and a low cost display device can be provided.

  Although the display device of the present invention has been described by way of example with the configuration of the above-described embodiment, the present invention is not limited to this, and the scope of the present invention is not deviated from the other configurations. Of course, various improvements and design changes are possible.

  For example, a flat plate-like lens member made of PMMA resin or the like colored as needed may be provided between the front panel 10 and the light guide member 70. The light source 51 is a chip type light emitting diode for vertical light emission, but may be a chip type light emitting diode for horizontal light emission that emits light in the surface direction of the wiring substrate 50. The light source 51 is disposed on the rear surface of the wiring substrate 50, but may be disposed on the front surface.

  Moreover, although the front panel 10 was inorganic glass, transparent or semi-transparent PMMA resin etc. may be sufficient. In addition, although the transparent resin layer 20 is filled with a gel-like material, a transparent optical adhesive (OCA: Optical Clear Adhesive) sheet may be bonded to fill the gap. In addition, the double-sided tape T may be one in which an adhesive member such as a double-sided adhesive tape is attached to a base material of an elastic body, or may be a light-shielding black liquid adhesive or the like.

  The present invention relates to a display device for a vehicle, and can be applied to, for example, a display device for a vehicle mounted on a mobile body equipped with an automobile or a motorcycle, or an agricultural machine or a construction machine.

10 front panel
Reference Signs List 20 transparent resin layer 31 predetermined information 32 display element 72a stepped portion 50 wiring board 51 light source 70 light guiding member 71 incident surface (incident portion)
72 base 73 extension 73a reflection surface (reflection portion)
74 Exiting face (outgoing part)

Claims (5)

Translucent panel,
A wiring board disposed behind the panel;
A light source connected to the wiring board;
An incident portion for receiving the light of the light source, a base extending outward from the incident portion toward the wiring board, an extending portion extending from the base toward the panel, and the extending portion extending from the extending portion A light guiding member having a light emitting portion for emitting light of a light source to the panel;
The display unit according to claim 1, wherein the emission unit has a step shape. The extension portion has a reflection portion that reflects the light of the light source toward the emission portion,
The display device according to claim 1, wherein the emission unit has a step shape substantially parallel to the reflection unit. It has a display means arranged between the panel and the wiring board and capable of displaying predetermined information,
3. The display device according to claim 1, wherein an area of the wiring substrate in a plane direction is smaller than that of the display unit, and the wiring substrate is disposed inside the display unit. The light source is disposed behind the wiring board.
The display device according to any one of claims 1 to 3, wherein the base portion has a step portion formed so as to approach the panel from the rear of the wiring substrate. 4. The display device according to claim 3, further comprising a transparent resin layer filled in a gap formed between the panel and the display means, and joining the panel and the display means.

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