JP2019164026A - Display device - Google Patents

Abstract

To provide a display device capable of suitably shielding the light of a light guide end face.SOLUTION: A display device includes: a first dial 14 that is provided in a front side of a light source 17a and displays a design by transmitting light; a second dial 13 that is provided in a rear side of the first dial 14 and is formed to an area larger than that of the first dial 14; a case body 18 that is provided in a rear side of the second dial 13 and supports the first dial 14 and the second dial 13; and a covering member 36 that is disposed on fronts of the first dial 14 and the second dial 13 and covers an outer peripheral edge 14b of the first dial 14. The second dial 13 includes a plurality of through holes divided by a connection part 13b, the case body 18 includes a plurality of projecting wall parts 41b that penetrate a through hole part and project to a side of the first dial 14, and the covering member 36 includes a light-shielding wall part 36d formed so as to fill up a gap part 41c between the projecting wall parts 41b positioned in the connection part 13b.SELECTED DRAWING: Figure 9

Description

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

  A vehicle such as an automobile is equipped with a display device that displays information necessary for driving such as a speedometer and an engine speed meter. Such a display device has a dial plate having a design such as scales, numbers, characters, symbols and the like formed in a letter shape. The dial displays the design or makes it stand out by illuminating it by transmitting light from a light source provided on the back side.

  The display device has a required light shielding structure on the dial and its peripheral members so that light does not leak from regions other than the design.

JP 2014-25865 A

  When the design is provided in the vicinity of the end surface that is a surface along the thickness direction of the dial, it is necessary to guide light from the light source directly or to the vicinity of the end surface using a light guide or the like. In this case, it is necessary to cover the end surface of the light guide with a light shielding member so that the light diffused inside the light guide does not leak from the end surface. However, there is a case where it is difficult to secure a space for arranging the light shielding member due to the design of the display device, and a light shielding member having a high degree of design freedom has been demanded.

  The present disclosure has been made in view of such circumstances, and an object thereof is to provide a display device capable of suitably shielding light from an end surface of a light guide.

  The display device according to the present disclosure includes a light source 17 a that emits light, a first dial 14 that is provided on the front side of the light source 17 a and displays the design 35 by transmitting the light, and a rear surface of the first dial 14. A second dial plate 13 having a larger area than the first dial plate 14 and a back side of the second dial plate 13, the first dial plate 14 and the second dial plate 13 A supporting case body 18 (14), and a covering member 36 disposed on the front face of the first dial plate 14 and the second dial plate 13 and covering the outer peripheral edge 14b of the first dial plate 14; The dial plate 13 has a plurality of through-hole portions 13a divided by connecting portions 13b, and the case body 18 (14) passes through the through-hole portion 13a and protrudes toward the first dial plate 14 side. It has a protruding wall part 41b and the covering part 36 is characterized by having a light shielding wall portion 36d which is formed so as to fill the clearance 41c between the projecting wall portion 41b located in the connecting part 13b.

  In the display device according to the present disclosure, it is possible to suitably shield the light guide end surface.

The front view which shows the display apparatus which is 1st Embodiment of the display apparatus which concerns on this indication. Sectional drawing which follows the II-II line | wire of FIG. Sectional drawing which follows the IV-IV line of FIG. Sectional drawing which follows the III-III line of FIG. Explanatory drawing which shows the positional relationship of a display panel and a light guide. The perspective view which shows a light guide and a light-shielding member. The enlarged view explaining the dial for display screens of FIG. 2, the dial for speedometers, and a light guide. (A) The perspective view which shows the back side of a decoration ring, (b) The perspective view which shows the state which combined the dial for display screens, and the case body. Sectional drawing which shows the display apparatus which is 2nd Embodiment of the display apparatus which concerns on this indication.

  A display device according to a first embodiment of the present disclosure will be described with reference to the accompanying drawings. The display device according to the present disclosure is mounted on a vehicle such as an automobile or a motorcycle, a ship, an agricultural machine, or a construction machine. In the present embodiment, a description will be given using an example in which the display device according to the present disclosure is a display device for an automobile having a speedometer and a display screen.

  In the following description, the “front side” means the front side in FIG. 1 and the upper side in FIGS. 2, 3, and 4, and the side that is visible to the viewer (driver). “Back side” means the back side in FIG. 1 and the bottom side in FIGS.

  The display device 1 has a speedometer 2 and a display screen 3. The speedometer 2 is a pointer-type (mechanical) meter that displays the speed of the vehicle. The display screen 3 is a liquid crystal display screen, for example, and displays various information such as a travel distance, a gasoline remaining amount, and navigation information. The speedometer 2 points to a speedometer dial plate 14 provided on the front side with respect to the display screen 3. Further, a part of the speedometer 2 is disposed so as to be superimposed on the front side of the display screen 3.

  The display device 1 includes a pointer 11, a display panel 12, a display screen dial plate (first dial plate) 13, a speedometer dial plate (second dial plate) 14, a light guide 15, and a light shielding member 16. And a circuit board 17 and a case (case body) 18.

  The pointer 11 is connected to a pointer shaft of a pointer driving unit provided on the circuit board 17 and rotates on a surface parallel to the surface of the speedometer dial 14. The pointer 11 indicates a scale (design 35) formed on the speedometer dial 14 corresponding to the speed according to the speed of the vehicle.

  The display panel 12 is provided on the back side of the display screen dial plate 13 and displays information. The display panel 12 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. In addition, the display panel 12 has a pair of surface polarizing plates (polarizing filters) arranged so as to sandwich the pair of surface glass substrates. The display panel 12 is connected to the circuit board 17 via a flexible board such as FPC (Flexible Printed Circuits).

  The display panel 12 applies a driving voltage to the liquid crystal layer through the transparent electrode as controlled by the control unit of the circuit board 17. Thereby, the orientation of the liquid crystal molecules in the liquid crystal layer is controlled, and the individual pixels of the display panel 12 are switched to the transmissive state or the non-transmissive state. With such a combination of pixels, the display panel 12 displays predetermined information on the display screen 3.

  A backlight unit is provided on the back side of the display panel 12. The backlight unit includes a light source such as an LED (Light Emitting Diode) and a light guide, and illuminates the display panel 12 from the back surface. The display panel 12 is housed in a display panel case 12a (FIG. 5) together with a backlight.

  The display screen dial plate 13 is a thin plate-like member provided on the front side of the display panel 12 and the back side of the light guide 15. The display screen dial 13 is formed in a larger area (large area) than the speedometer dial 14.

  The display screen dial plate 13 has an opening 31 and a design 32. The opening 31 partitions the display panel 12 and exposes the display screen 3. That is, the display screen dial plate 13 exposes a region to be the display screen 3 out of the display region of the display panel 12, and hides a part of the peripheral side of the display region and the display panel case 12a. The opening 31 may be a permeable layer provided on the base material 21.

  The design 32 is a symbol that displays the state of the vehicle, for example. The design 32 is turned on when the light of the light source irradiated from the back side of the display screen dial 13 is transmitted.

  As shown in FIG. 7, the display screen dial plate 13 includes a base material 21, a light shielding layer 22, and a reflective layer 23.

  The base material 21 is a transparent polycarbonate resin, for example, and is a plate-like member having transparency (translucency).

  The light shielding layer 22 is a printed layer printed with black light shielding ink formed on the front side (or back side) of the substrate 21. The light shielding layer 22 is provided at least in a region that is visually recognized on the display screen dial plate 13, that is, in a region where the surface of the display screen dial plate 13 is not covered with other members. The light shielding layer 22 has a letter portion corresponding to the shape of the design 32.

  The reflective layer 23 is a region facing the light guide 15 in the display screen dial plate 13, and is provided on the front side (or back side) of the base material 21. That is, the reflective layer 23 is a region located on the back side of the speedometer dial 14 and is a region that is not visually recognized by a viewer. The reflective layer 23 is provided to reflect the light in the light guide 15 and diffuse it in the light guide 15. The reflective layer 23 is a layer printed with white ink having a high reflectance, for example, and has a higher reflectance than the base material 21 and the light shielding layer 22 of the display screen dial 13.

  As shown in FIG. 4, the speedometer dial 14 is a thin plate-like member provided on the front side of the light source 17 a and the back side of the pointer 11. The speedometer dial 14 has an arc shape having a certain width. As for the dial 14 for speedometers, the one end part 14a of the circumferential direction (length direction) is superimposed on the display screen 3. FIG. The speedometer dial 14 has a design 35 that is illuminated and displayed by transmitting light from the light source 17a. The design 35 is a scale indicated by numerals, letters, and the pointer 11.

  A decorative ring (cover member) 36 is disposed on the outer peripheral edge 14 b of the speedometer dial 14. The decoration ring 36 is formed to decorate the outer peripheral edge 14 b of the speedometer 2 and simultaneously cover the end face of the speedometer dial 14 and the protruding wall portion 41 b of the middle case 41. That is, as shown in FIGS. 2 and 3, the decoration ring 36 is disposed on the front surface of the speedometer dial 14 and the display screen dial 13, and the cross section is formed in an inverted J (alphabet J) shape. It has an upper end surface 36b that contacts the speedometer dial plate 14 and a lower end surface 36c that contacts the display screen dial plate 13. In addition, the decoration ring 36 is not arrange | positioned in the one end part 14a and the inner periphery 14c of the dial 14 for speedometers. That is, the one end portion 14a and the inner peripheral edge 14c are exposed and are not covered with other members such as the decorative ring 36.

  The light guide 15 is disposed on the back side of the speedometer dial 14 and guides the light from the light source 17 a to the speedometer dial 14. 5 and 6, the light guide 15 is indicated by hatching.

  The light shielding member 16 covers the end surfaces 15a and 15c along the thickness direction (front to back direction) of the light guide 15. The light guide 15 and the light shielding member 16 are integrally molded products in which the light shielding member 16 is in close contact with the end surfaces 15a and 15c. The light guide 15 and the light shielding member 16 are formed by two-color molding or insert molding.

  Details of the speedometer dial plate 14, the light guide 15 and the light shielding member 16 will be described later.

  The circuit board 17 mainly includes a driver and control unit for the display panel 12 and the light source 17a, a light source 17a, and a pointer driving unit.

  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. A control part acquires vehicle speed, various vehicle information, etc. from various sensors etc. from ECU (Electronic Control Unit) of a vehicle, for example. The control unit drives and controls the speedometer 2 and the display screen 3 based on the acquired information.

  The light source 17 a is an LED (Light Emitting Diode) and illuminates the speedometer dial 14. The circuit board 17 also has a light source for the design 32 of the display screen dial 13 in addition to the light source 17a.

  The case 18 includes an intermediate case (case body) 41, a lower case 42, and an upper case 43.

  The middle case 41 is made of a synthetic resin such as white, and fixes or supports the display panel 12, the display screen dial 13, the speedometer dial 14, and the circuit board 17.

  As shown in FIG. 4, the middle case 41 has a partition wall 41 a that surrounds the light source 17 a for the speedometer dial 14 and guides light. The partition wall 41a forms a cylindrical space with a wall that divides the illumination (light emission) region of the light source 17a, and light passes through the cylindrical space. One end of the partition wall 41a (the surface of the partition wall 41a facing the circuit board 17) is in contact with the circuit board 17, and the other end (the surface of the partition wall 41a facing the dial 14 for speedometer) is the light guide 15. The light shielding member 16 is in contact with the back surface.

  Further, as shown in FIGS. 2 and 3, the middle case 41 has a protruding wall portion 41 b that shields the end surface 15 b on the outer peripheral side of the light guide 15. The protruding wall portion 41 b passes through the display screen dial 13 and protrudes to the front side, and rises substantially perpendicular to the display screen dial 13. Note that the protruding wall portion 41 b also has a function of reflecting light traveling through the light guide 15. The protruding wall portion 41b is formed in a strip shape having an arc shape along the end surface 15b.

  As shown in FIGS. 5 and 8, the display screen dial plate 13 has a through-hole portion 13a for penetrating the protruding wall portion 41b. The through-hole portion 13a has two connecting portions 13b in order to prevent the radial width from becoming wider or narrower and to maintain the radial width. That is, the through-hole part 13a is divided into a plurality (three) by the connecting part 13b. The protruding wall portion 41b is also divided into a plurality (three pieces) by the connecting portion 13b, and has a slit portion (gap portion) 41c for arranging the connecting portion 13b.

  In addition, the decorative ring 36 includes light shielding ribs (light shielding wall portions) 36d formed so as to fill the two slit portions 41e. The light shielding rib 36d protrudes from the front side portion of the speedometer dial plate 14 toward the display screen dial plate 13, passes through the speedometer dial plate 14, is positioned at the slit portion 41e, and contacts the connecting portion 13b. Touch. In FIG. 8, the display screen dial plate 13 is indicated by hatching.

  The upper case 43 and the lower case 42 are made of, for example, black synthetic resin, and form an internal space formed by fitting. The pointer 11, the display panel 12, and the display screen dial 13 are formed in the internal space. The speedometer dial 14 and the circuit board 17 are accommodated.

  Next, details of the speedometer dial plate 14, the light guide 15, and the light shielding member 16 will be described.

  The speedometer dial plate 14, the light guide 15, and the light shielding member 16 are components of the speedometer 2. The light guide 15 and the light shielding member 16 which are integrally molded products are arranged to face the front surface of the display screen dial 13. That is, the display screen dial plate 13 faces the light guide 15 and is provided on the back side of the light guide 15. In the light guide 15 and the light shielding member 16, a plurality of hooks projecting from the back side of the light guide 15 and the light shielding member 16 toward the middle case 41 penetrate the display screen dial 13 and engage with the middle case 41. It is positioned by joining. The speedometer dial 14 is disposed on the front surface of the light guide 15 and the light shielding member 16 and the front end surface 41c of the protruding wall portion 41b (FIG. 2).

  The speedometer dial 14 is positioned by the shielding wall 16 b of the light shielding member 16. The speedometer dial 14 is fixed to the light guide 15 via an adhesive layer printed on the back surface of the speedometer dial 14, for example, and then fixed by a decorative ring 36. Although the speedometer dial 14 faces the shielding wall 16b, a constant gap is provided in design. Thereby, the one end part 14a and the inner periphery 14c of the dial 14 for speedometers will be in the state exposed without being covered with another member.

  As shown in FIG. 7, the speedometer dial 14 includes a base material 51, a colored layer 52, and a light shielding layer 53. The base material 51 has an attenuation layer 54. The colored layer 52, the light shielding layer 53, and the attenuation layer 54 are stacked on the base material 51. Specifically, on the front surface side of the base material 51, an attenuation layer 54, a colored layer 52, and a light shielding layer 53 are laminated in order from the base material 51 side. The light shielding layer 53 is provided on the attenuation layer 54 in a region where the colored layer 52 is not provided. In addition, on the back side of the base material 51, an attenuation layer 54, a colored layer 52, and a light shielding layer 53 are sequentially provided from the base material 51 side.

  The base material 51 is a transparent polycarbonate resin, for example, and is a plate-like member having transparency (translucency).

  The attenuation layer 54 is a layer provided on the front surface and the back surface of the base material 51 to attenuate transmitted light or reflected light. The attenuation layer 54 is a smoke printed layer printed with, for example, smoked ink, and has a transmittance smaller than that of the substrate 51 and a lightness smaller than that of the colored layer 52.

  The colored layer 52 is a layer provided at least in a region where the design 35 is provided. The colored layer 52 is a layer having an arbitrary color printed with, for example, white ink. The colored layer 52 acts as the color of the design 35 in a state where it is not illuminated by the light of the light source 17a. In addition, the colored layer 52 has a function as a filter relating to the color of light from the light source 17a in a state where it is illuminated by the light from the light source 17a.

  The colored layer 52 on the front side is provided only in the region where the design 35 is formed. On the other hand, the colored layer 52 on the back side is provided over the entire surface of the speedometer dial 14. The colored layer 52 on the front side mainly has a function of displaying the color of light transmitted through the speedometer dial 14 in a desired color. The colored layer 52 on the back side has a function of making the color of light transmitted through the colored layer 52 on the front side clearer and a function of reflecting the light in the base material 51 and diffusing it in a wide range. Yes.

  The light shielding layer 53 is a layer provided to shield light from the light source 17a, which is printed with, for example, black light shielding ink. The light shielding layer 53 has a cutout character portion corresponding to the shape of the design 35. That is, the light shielding layer 53 shields light in a region other than the region of the design 35. The front-side light-shielding layer 53 is provided on the front side of the attenuation layer 54 (base material 51), but the region where the colored layer 52 is provided is provided so as to cover the periphery of the colored layer 52. Yes.

  The light guide 15 is made of, for example, a transparent acrylic resin (PMMA). The light guide 15 has a light receiving part 61 and a light guide part 62 (FIG. 4). The light receiving unit 61 faces the light emitting surface of the light source 17a, receives light from the light source 17a, and guides the light from the back surface of the display device 1 toward the front surface (from the light source 17a to the speedometer dial 14). The light guide unit 62 is a plate-like member that is bent vertically from the light receiving unit 61 and has an arc shape having a certain width. The light guide part 62 should just be provided at least in the back side of the design 35 of the dial 14 for speedometers, and has the substantially same external shape as the dial 14 for speedometers in this embodiment.

  The light shielding member 16 is made of, for example, a black ABS resin, and is made of a light shielding material. The light shielding member 16 covers the end surfaces 15 a and 15 c in order to prevent light leakage from the end surfaces 15 a and 15 c exposed without being shielded by the decorative ring 36 and the protruding wall portion 41 b among the end surfaces of the light guide 15. Specifically, as shown in FIG. 6, the light shielding member 16 is an end face in the circumferential direction (length direction) of the light guide 15, and overlaps the display screen 3. The end face 15c (in the width direction) along the periphery is covered.

  From the viewpoint of reducing the thickness of the light guide 15, the light shielding member 16 is preferably provided only on the end faces 15 a and 15 c of the light guide 15 and not provided on the back side of the light guide 15. Thereby, the light guide 15 can be made thin and the display screen 3 and the speedometer 2 can be brought close in the thickness direction. Moreover, in order to reflect the light in the light guide 15 by the protruding wall portion 41b of the middle case 41, the end surface 15b along the outer peripheral edge (in the width direction) facing the protruding wall portion 41b of the end surface of the light guide 15 is formed. The light shielding member 16 is preferably not provided.

  Since the slit portion 41e is provided in this way, the light from the end surface 15b of the light guide 15 leaks to the outside of the protruding wall portion 41b, and the lower end surface 36c of the decorative ring 36 and the display screen There was a risk of leakage to the outside of the decorative ring 36 from the gap with the dial 13 for use. However, since the light shielding rib 36d that fills the slit portion 41e is formed in the decorative ring 36, it is possible to prevent light from the end surface 15b from leaking to the outside of the protruding wall portion 41b.

  A display device according to a second embodiment of the present disclosure will be described with reference to FIG. The same parts and equivalent parts as those in the first embodiment will be described with the same reference numerals.

  In the second embodiment, the light guide 15 is eliminated. The speedometer dial 14 is a translucent part through which light from the light source 17a passes through the area of the speedometer dial 14 facing the display screen dial 13 (area corresponding to the reflective layer 23 in FIG. 7). 24. The speedometer dial 14 has a narrowed portion 14e formed on the pointer 11 side so as to overlap the display screen dial 13 by drawing (hot plate pressure forming). The case body 18 has a reflection surface 41 d that guides light from the light source 17 a to the light transmitting portion 24.

  By being formed in this way, the speedometer dial 14 can be illuminated from behind even when the light guide 15 is not provided, and the light shielding rib 36d that fills the slit portion 41e in the decorative ring 36 is formed. It is possible to prevent light transmitted through the display screen dial 13 from leaking to the outside of the protruding wall portion 41b.

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

  In the first embodiment, an example in which the display screen dial plate 13 includes the reflective layer 23 has been described, but the reflective layer may be omitted and the base material 51 may face the light guide 15. In this case, the light guide 15 faces the white middle case 41 via the base material 51, and the middle case 41 functions as a light reflection layer in the light guide 15. As a result, the light guide efficiency can be improved, and at the same time, the printing process of the reflective layer 23 of the display screen dial 13 can be reduced.

  The display panel 12 may be a segment type liquid crystal display panel, an organic EL (Electro-Luminescence) panel, a matrix type liquid crystal display panel such as a TFT (Thin Film Transistor), or an organic EL panel.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Speedometer 3 Display screen 11 Pointer 12 Display panel 12a Display panel case 13 Display screen dial (2nd dial)
13a Through-hole part 13b Connecting part 14 Dial for speedometer (first dial)
14b outer peripheral edge 15 light guide 16 light shielding member 16b shielding wall 17 circuit board 17a light source 18 case (case body)
21, 51 Base material 22, 53 Light-shielding layer 23 Reflective layer 31 Opening 32, 35 Design 36 Decoration ring (covering member)
36b Upper end surface 36c Lower end surface 36d Light shielding rib (light shielding wall)
41 Middle case (case body)
41a Partition wall 41b Projection wall part 41e Slit part (gap part)
42 Lower case 43 Upper case 52 Colored layer 54 Attenuating layer 61 Light receiving portion 62 Light guiding portion

Claims (3)

A light source that emits light;
A first dial that is provided on the front side of the light source and displays a design by transmitting the light;
A second dial plate provided on the back side of the first dial plate and having a larger area than the first dial plate;
A case body which is provided on the back side of the second dial plate and supports the first dial plate and the second dial plate;
A cover member disposed on the front surface of the first dial and the second dial and covering an outer periphery of the first dial;
The second dial plate has a plurality of through-hole portions divided by connecting portions, and the case body has a plurality of protruding wall portions that pass through the through-hole portion and protrude toward the first dial plate side. ,
The display device according to claim 1, wherein the covering member has a light shielding wall portion formed so as to fill a gap portion between the protruding wall portions located in the connecting portion. The display device according to claim 1, further comprising a light guide disposed on a back side of the first dial and guiding the light to the first dial. Provided on the back side of the second dial, further comprising a display panel for displaying information;
The second dial plate has an opening that exposes the display panel and partitions a display screen;
The first dial and a part of the light guide are arranged to overlap the front side of the display screen,
The display device according to claim 2, wherein the protruding wall portion covers at least the end face of the light guide that overlaps the display screen.

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