WO2017018196A1

WO2017018196A1 - Display device

Info

Publication number: WO2017018196A1
Application number: PCT/JP2016/070501
Authority: WO
Inventors: 高橋　泰史
Original assignee: 日本精機株式会社
Priority date: 2015-07-27
Filing date: 2016-07-12
Publication date: 2017-02-02
Also published as: JP2017026549A; JP6481551B2

Abstract

Provided is a display device in which a display panel can be uniformly illuminated. This display device is provided with: a light source 2; a display panel 3 through which light L from the light source 2 passes, thereby displaying a design; and a light shielding member 4 which faces the light source 2 and shields part of the light L directed at the display panel 3. The display device also includes: a first reflective surface 5 with which the light shielding member 4 is provided, and which reflects light L from the light source 2; a second reflective surface 6 which faces the first reflective surface 5 and from which first reflected light L1 which has been reflected by the first reflective surface 5 is further reflected toward the display panel 3; and a hole portion 7 which is provided penetrating through the light shielding member 4 and which allows second reflected light L2, comprising light L from the light source 2 that has been reflected by the second reflective surface 6, to pass through toward the display panel 3.

Description

Display device

The present invention relates to a display device.

As a conventional display device, for example, there is a vehicle instrument disclosed in Patent Document 1 below.
The instrument for vehicles indicated by patent documents 1 is provided with a display board provided with a design which displays a scale, a numerical value, etc., and a light source which illuminates a display board. The portion of the light shield that faces the light source prevents the light from the light source from directly illuminating the display panel, and the first reflected light that is reflected by the first reflecting surface that is provided so as to surround the light shield is a shadow of the light shield. Illuminate. The light shielding unit includes a second reflection surface, reflects light from the light source toward the outside, and further reflects the light from a third reflection surface provided apart from the second reflection surface to illuminate the display panel.
Thereby, illumination unevenness due to light from the light source is reduced to illuminate the display panel.

JP 2011-099765 A

In the vehicular instrument described in Patent Document 1, light from a light source is shielded by a light shielding part, and the light that is shaded by the light shielding part is irradiated with the reflected light reflected by the first reflecting surface for illumination. There is a problem that the shadowed portion of the light shielding portion becomes too bright and uneven illumination occurs, and it is necessary to adjust the uneven illumination by performing halftone dot printing or the like on the display board.
In addition, by providing the first reflection surface surrounding the light shielding portion, the shadowed portion of the light shielding portion can be illuminated, but by providing the first reflection surface, the shadow due to the light from the light source can be formed on the display board, There is also a problem that uneven illumination occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device that can illuminate a display plate evenly.

In order to achieve the above object, a display device according to the present invention includes:
A light source;
A display board for displaying a design by transmitting light from the light source;
A light shielding member that opposes the light source and shields part of the light to the display plate,
A first reflecting surface provided on the light shielding member and reflecting the light from the light source;
A second reflecting surface facing the first reflecting surface that reflects the primary reflected light reflected by the first reflecting surface further toward the display panel;
A hole that is provided through the light shielding member and allows the secondary reflected light reflected by the second reflecting surface to pass toward the display plate.
It is characterized by that.

According to the present invention, the display board can be illuminated uniformly.

It is a front view shown with the instrument apparatus which concerns on one Embodiment of the display apparatus of this invention. It is a schematic sectional drawing which concerns on one Embodiment of the display apparatus of this invention. It is a top view which removes and shows the display board which concerns on one Embodiment of the display apparatus of this invention. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 according to an embodiment of the display device of the present invention. It is explanatory drawing of the light-shielding member and hole which concern on one Embodiment of the display apparatus of this invention. It is explanatory drawing of the illumination state by the reflected light of the display board which concerns on one Embodiment of the display apparatus of this invention.

A display device according to an embodiment of the present invention will be described in detail with reference to the drawings.
The display device 1 of the present embodiment includes a light source 2, a display plate 3 that displays a design 3 a by transmitting light L from the light source 2, and a part of the light L to the display plate 3 facing the light source 2. A first reflection surface 5 that is provided on the light shielding member 4 and reflects light L from the light source 2, and a primary reflected light L1 reflected by the first reflection surface 5. Further, the second reflection surface 6 that faces the first reflection surface 5 that reflects toward the display plate 3 side, and the second reflection surface that is provided through the light shielding member 4 and reflected by the second reflection surface 6. And a hole 7 that allows L2 to pass toward the display panel 3.
The display device 1 is incorporated in an instrument device 100 for a vehicle such as an automobile or a two-wheeled vehicle, and is used to illuminate the display plate 3 with a light source 2 without uneven illumination.

Here, first, the configuration of the instrument device 100 in which the display device 1 is incorporated will be described, and then the display device 1 will be described.
In the following description, design (characters, scales, etc. (index part)) 3a such as measurement values when the display device 1 and the instrument device 100 are viewed from the front (that is, when the user views the display device 1 from the front). The viewing side when checking is called “front”, and the back side is called “back”.

(Instrument device 100)
The instrument device 100 is configured as an instrument for notifying various types of information related to a vehicle on which the instrument device 100 is mounted, and is configured by, for example, a pointer-type speedometer as shown in FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the instrument device 100 includes a pointer 20, a pointer light source 30, a drive unit 40, a circuit board 50, a case 60, an outer case (not shown), and the display device 1. A light source (display plate light source) 2 and a display plate 3 are provided.

The pointer 20 includes a rotation center portion 20b that rotates about the rotation shaft 20a, an instruction portion 20c that is formed integrally with the rotation center portion 20b, a cover portion (not shown), and a pointer cap 20d.
The rotation center portion 20b and the instruction portion 20c are formed transparently from a resin such as PC (polycarbonate), for example. The cover part and the pointer cap 20d are light opaque parts, and are formed of a predetermined resin in black, for example.
The rotation center portion 20 b has a rotation shaft 20 a that is connected to the rotation shaft 40 a of the drive unit 40. Thereby, the rotation center part 20b rotates centering on the rotating shaft 20a. The instruction portion 20c is a portion that is provided so as to extend in the radial direction from the rotation center portion 20b, and that indicates a design 3a such as characters and scales that serve as an indicator portion of the display panel 3 described later.
A light receiving surface 20e and an inclined surface 20f are formed on the opposite side of the rotation center portion 20b from the direction in which the instruction portion 20c extends. The light receiving surface 20e is a surface facing the back side of the rotation center portion 20b, and receives light from the pointer light source 30. The inclined surface 20f is located on the front side of the light receiving surface 20e, and reflects the light from the pointer light source 30 incident from the light receiving surface 20e toward the tip of the pointing unit 20c. On the back surface of the instruction unit 20c, for example, a white foil is hot stamped to illuminate the reflected light.

The light incident from the light receiving surface 20e is reflected by the inclined surface 20f and guided to the distal end side of the instruction unit 20c, and the instruction unit 20c emits light. In addition, light that hits the back surface of the light guided to the front end side of the instruction unit 20c and extraneous light (for example, sunlight) that has entered from the front side of the instruction unit 20c is reflected by the back surface of the instruction unit 20c and is reflected on the front side. Is emitted.
The instruction unit 20c is provided with a light-impermeable portion cover so as to surround the side portion. The cover part and the instruction part 20c are integrally formed, for example. The pointer cap 20d covers the front side of the rotation center portion 20b. The indicator cap 20d blocks light from the rotation center portion 20b to the front side.

The pointer light source 30 is for causing the pointer 20 to emit light. The pointer light source 30 is composed of, for example, an LED (Light Emitting Diode). The pointer light source 30 is mounted on the front side of the circuit board 50. A plurality of pointer light sources 30 are arranged on the inner (small diameter) circumference around the axis of the rotation shaft 20a of the pointer 20 at equal intervals so as to correspond to the rotation range of the pointer 20. As will be described later, the pointer light source 30 is shielded from light by the cylindrical portion 60a of the case 60 and causes only the pointer 20 to emit light.

The drive unit 40 is composed of, for example, a stepping motor, and rotates the rotating shaft 40a under the control of a control unit described later. The drive unit 40 is mounted on the back side of the circuit board 50. The rotating shaft 40 a passes through a hole provided in the base material of the circuit board 50 and is disposed on the front side of the circuit board 50. A hollow rotation shaft 20a of the pointer 20 (provided at the rotation center portion 20b of the pointer 20) is connected to the rotation shaft 40a. As a result, the pointer 20 rotates with the rotation of the rotation shaft 40a of the drive unit 40. The drive unit 40 rotates the pointer 20 to a position corresponding to the speed of the vehicle under the control of the control unit.

The circuit board 50 is formed by printing various wirings on an insulating plate-like base material made of, for example, glass epoxy resin. A control unit (not shown) that controls the operation of the instrument device 100 is mounted on the circuit board 50. The control unit acquires vehicle information such as the speed of the vehicle from an external device (for example, an ECU (Electronic Control Unit)) of the meter device 100, and based on the acquired information, the pointer light source 30 and a display to be described later The plate light source (light source) 2 is turned on / off or the drive unit 40 is operated.

The case 60 constitutes a middle case for holding components constituting the instrument device 100 such as the circuit board 50 and the display board 3. The case 60 is fixed to the surface side of the circuit board 50, and is made of, for example, white light-proof polypropylene resin. The case 60 includes a central cylindrical portion 60a, an outer cylindrical portion 60b (see FIG. 3) connecting approximately three circular arcs, and a disk portion 60c between the cylindrical portion 60a and the outer cylindrical portion 60b. I have.
The cylindrical portion 60 a at the center of the case 60 is provided between the pointer light source 30 and the display plate light source 2 on the circumference, and is formed in a cylindrical shape extending along the normal direction of the circuit board 50. Yes. The rotating shaft 20a of the pointer 20 is located on the inner peripheral portion of the cylindrical portion 60a. The cylindrical portion 60 a causes the pointer 20 to emit light while shielding the light from the pointer light source 30 so as not to spread in the radial direction of the rotation shaft 20 a of the pointer 20. The outer cylinder part 60 b is provided so as to surround the outer periphery of the display plate 3 of the instrument device 100, and forms an illumination space that guides light from the light source 2 for display plate to the display plate 3.
The display device 1 illuminates the display plate 3 from the back side with a display plate light source (light source) 2 using an illumination space. Details of the display device 1 will be described later.

The instrument device 100 includes a turning member (not shown) on the front side of the case 60 (the front side of the display board 3 described later) so as to hide unnecessary portions of the instrument device 100. The facing member uses, for example, a resin such as ABS (Acrylonitrile Butadiene Styrene copolymer), and is black and has a light shielding property. The facing member is provided with an opening through which the instrument device 100 can be seen, and a transparent plate (not shown), for example, glass is attached so as to close the opening.

The instrument device 100 includes a lower case (not shown). The lower case is located on the back side of the case 60 with the circuit board 50 interposed therebetween. By combining the lower case and the turning member closed with the transparent plate, the casing of the instrument device 100 is formed in a substantially box shape.

(Display device 1)
Next, the display device 1 incorporated in the instrument device 100 will be described.
The display device 1 includes a light source 2, a display plate 3 that displays the design 3 a by transmitting the light L from the light source 2, and a light shield that blocks a part of the light L toward the display plate 3 facing the light source 2. A first reflection surface 5 provided on the light shielding member 4 to reflect the light L from the light source 2, and the primary reflected light L 1 reflected by the first reflection surface 5. A second reflecting surface 6 facing the first reflecting surface 5 that reflects toward the side, and the light shielding member 4 are provided so as to penetrate the second reflecting surface L2 reflected by the second reflecting surface 6. 3 and a hole portion 7 that is passed through toward the center.

The light source 2 constitutes a light source for a display plate for illuminating the display plate 3. The light source 2 for display board is comprised, for example from LED. The light source 2 for the display board is mounted on the front side of the circuit board 50.
A plurality of light sources 2 for the display panel are arranged on the circumference outside (large diameter) from the light source 30 for pointers, with the axis of the rotation axis 20a of the pointer 20 as the center. Here, as shown in FIG. 3, the light source 2 for the display board is composed of three pieces, and is arranged at three positions on the left and right sides and the upper side with the axis of the rotation shaft 20 a of the pointer 20 as the center. Illuminate.

The display board 3 is located on the back side of the pointer 20, and a design (index portion) 3a such as numerals, symbols, and scales serving as an index portion by the pointer 20 is formed on a transparent substrate 3b having transparency by printing or the like. Is. The substrate 3b is made of a predetermined resin, for example, a polycarbonate resin, and has a light transmitting property. The substrate 3b is formed in a disc shape corresponding to the outer shape of the instrument device 100, for example, as shown in FIG. The design 3a is formed by making a part of the light-shielding printing layer formed on the front side and / or the back side of the substrate 3b, for example, into a letter shape. Note that a translucent print layer may be formed on the letter-shaped portion.

The light shielding member 4 is disposed on the front side of the light source 2, shields a part of the light L from the light source 2, and prevents the display plate 3 from being directly irradiated. The light shielding member 4 includes a convex portion 4a protruding toward the back side of the central portion, and a disc portion 4b continuous to the front side of the convex portion 4a. Placed in. The light shielding member 4 is formed integrally with the case 60 and is made of a light-shielding white resin, for example, a polypropylene resin, and the surface on the light source 2 side constitutes a reflective surface.
For example, the convex portion 4a has a conical shape having a vertex on the light source 2 side (back side). The conical surface of the convex portion 4a constitutes a reflection surface (fourth reflection surface) 8, and reflects the light L from the light source 2 toward the outside with the light source 2 as the center.
In addition, the convex part 4a of the light shielding member 4 is not limited to the conical shape, and may have another shape as long as it can reflect the light L from the light source 2 toward the outside.
The back surface of the disk portion 4 b constitutes the first reflecting surface 5. The first reflecting surface 5 is formed on an inclined surface that is inclined to the front side as the distance from the light source 2 increases. By tilting the first reflecting surface 5, the light L from the light source 2 can be reflected to a wider outer side than in the case of a horizontal plane.

In the disc portion 4b, a hole portion 7 is formed through the front and back of the outer peripheral portion. For example, as shown in FIG. 3, the hole 7 is formed in a substantially annular shape. For example, four arc-shaped holes 7 a are connected by a connecting portion 7 b and are formed in a substantially annular shape.
The hole 7 is configured so that the light L from the light source 2 passes through and does not directly irradiate the display panel 3. For example, the width of the arc-shaped hole 7 a (corresponding to the difference in radius between the two inner and outer arcs) It is set so that light from the light source 2 does not pass. Note that the width of the arc-shaped hole 7 a needs to be set as appropriate depending on the thickness of the disc portion 4 b of the light shielding member 4.
Further, the outer peripheral surface of the arcuate hole 7a is defined as a third reflecting surface 9, and the light L from the light source 2 irradiated on the third reflecting surface 9 is directed in a direction other than the display plate 3 as shown in FIG. For example, the light is reflected in the direction of the second reflecting surface 6. The 3rd reflective surface 9 is comprised by the inclined surface which spreads outside toward the back side from the front side. By constituting the peripheral surface of the hole 7 with such an inclined surface, it can also be used as a draft angle during the molding.

From the hole portion 7 of the light shielding member 4, the primary reflected light L <b> 1 reflected by the first reflecting surface 5 on the back side of the disc portion 4 b is further reflected by the second reflecting surface 6 that faces the first reflecting surface 5. The reflected secondary reflected light L2 is emitted. The second reflecting surface 6 is a surface substantially parallel to the display plate 3 and the disk portion 4b, and the front surface of the circuit board 50 is a reflecting surface, for example. The second reflecting surface 6 does not necessarily have a higher reflection efficiency than the first reflecting surface 5.
Thereby, the light L from the light source 2 is reflected by the first reflecting surface 5 of the disc portion 4b to become the primary reflected light L1, and the circuit board in which the primary reflected light L1 faces the first reflecting surface 5. The secondary reflected light L2 reflected by the surface 50 as the second reflecting surface 6 passes through the hole 7 of the light shielding member 4 and is irradiated to the display plate 3, and the display plate 3 is reflected by the secondary reflected light L2. Illuminated.
Therefore, the light L from the light source 2 is shielded by the light shielding member 4 so that the front side of the light shielding member 4 does not become too bright, and the strong light L from the light source 2 is directly transmitted from the hole 7 of the light shielding member 4. The secondary reflected light L2 reflected by the second reflecting surface 6 of the surface of the circuit board 50 facing the first reflecting surface 5 and the first reflecting surface 5 of the disc portion 4b is allowed to pass through the display plate. 3 is illuminated, it is possible to illuminate the display panel 3 while minimizing the occurrence of illumination unevenness in the illumination range in which the light shielding member 4 is disposed.

Further, in the display device 1, by providing the light shielding member 4, a shadow is formed on the display plate 3 by the light L from the light source 2, but in order to reduce the shadow, the cutout portion 4 c is provided in the light shielding member 4. It is formed. The notch portion 4 c is formed on the outer end of the disc portion 4 b of the light shielding member 4, that is, on the outer side of the first reflecting surface 5 with the corner of the outer peripheral surface and the back side surface of the disc portion 4 b as the center. The light shielding member 4 is cut away so as to become thinner.
As a result, the light L from the light source 2 illuminates the display board 3 without hitting the notch 4c as shown in FIGS. 5 and 6, and the width of the shadow formed on the display board 3 is illuminated. Can be reduced, and the luminance difference on the display panel 3 can be reduced.

In the display device 1, the fifth reflecting surface 10 and the sixth reflecting surface 11 are separated from the first reflecting surface 5 of the disk portion 4 b of the light shielding member 4 and the fourth reflecting surface 8 of the convex portion 4 a. It has.
The fifth reflecting surface 10 and the sixth reflecting surface 11 are formed integrally with the case 60. For example, the fifth and sixth reflecting

surfaces

10 and 11 are formed by the surface on the front side of the disc portion 60c of the case 60. Composed.
The fifth reflecting surface 10 is formed so as to be inclined toward the display panel 3 from the outer peripheral end of the light shielding member 4 toward the outside. The fifth reflecting surface 10 further reflects the primary reflected light L1 obtained by reflecting the light L from the light source 2 on the first reflecting surface 5. The reflected light L <b> 5 reflected by the fifth reflecting surface 10 illuminates the display plate 3 portion outside the light shielding member 4.
The sixth reflecting surface 11 is formed continuously with the outer peripheral end of the fifth reflecting surface 10 and inclined at a larger angle than the fifth reflecting surface 10. The sixth reflecting surface 11 further reflects the reflected light L4 obtained by reflecting the light L from the light source 2 by the fourth reflecting surface 8 of the convex portion 4a of the light shielding member 4. The reflected light L6 reflected by the sixth reflecting surface 11 illuminates the outermost display panel 3 farther than the light shielding member 4.
Therefore, in the display device 1, the primary reflected light L1 reflected by the first reflective surface 5 with respect to the display plate 3 outside the light shielding member 4 is reflected by the fifth reflective surface 10; The reflected light L4 reflected by the fourth reflecting surface 8 can be illuminated with the reflected light L6 obtained by causing the reflected light L4 to be deflected by the sixth reflecting surface 11. Thereby, the display board 3 of the part which becomes dark from the light source 2 can be illuminated with the reflected light L5 and L6 without uneven illumination.

According to such a display device 1, the display plate 3 in a range where the light shielding member 4 is installed shields the light L from the light source 2 with the light shielding member 4 and passes through the hole 7 formed in the light shielding member 4. The display plate 3 that is illuminated with the secondary reflected light L2 and is located outside the range where the light shielding member 4 is installed has the reflected light L5 reflected by the fifth reflecting surface 10 and the reflected light L6 reflected by the sixth reflecting surface 11. Can be illuminated by.
Thereby, the display panel 3 is not irradiated with strong light from the light source 2, and the illumination unevenness generated in the entire display panel 3 can be reliably suppressed.
Further, halftone dot printing for adjusting the illumination on the display board 3 which has been required up to now is not required, and the printing process of the display board 3 can be simplified and man-hours can be reduced.

According to the display device 1 of the present invention, the light source 2, the display plate 3 that displays the design 3 a by transmitting the light L from the light source 2, and the light L to the display plate 3 facing the light source 2. A first reflection surface 5 that is provided on the light shielding member 4 and reflects the light L from the light source 2, and a primary reflected light L1 that is reflected by the first reflection surface 5. Further, the second reflecting surface 6 facing the first reflecting surface 5 that reflects toward the display plate 3 side and the light shielding member 4 are provided so as to penetrate the light L from the light source 2 to the second reflecting surface. 6, the light L from the light source 2 is shielded by the light shielding member 4, and strong light is directly displayed on the display plate. The display board 3 is illuminated by the secondary reflected light L2 that passes through the hole 7 formed in the light shielding member 4 without illuminating the display board 3. It can be illuminated uniformly.
This eliminates the need for halftone dot printing for illumination adjustment, simplifies the printing process of the display board 3, and reduces the number of steps.

Further, according to the display device 1 of the present invention, the hole portion 7 includes the third reflection surface 9 that reflects the direct light L from the light source 2 in a direction other than the display plate 3. It is possible to reliably prevent strong light from passing through the hole 7 and illuminate the display panel 3, and to further illuminate the display panel 3 while suppressing uneven illumination.

Further, according to the display device 1 of the present invention, the hole 7 is formed so that the light L from the light source 2 does not pass directly toward the display plate 3, so that the strong light from the light source 2 is in the hole. 7 can be reliably prevented from illuminating the display panel 3, and the display panel 3 can be illuminated while further suppressing uneven illumination.

Further, according to the display device 1 of the present invention, the light shielding member 4 has the cutout portion 4c formed at the outer end portion of the disc portion 4b, so that the width of the shadow formed by the light shielding member 4 is reduced. It is possible to prevent the display panel 3 from being darkened due to a difference in luminance due to the shadow.

Further, according to the display device 1 of the present invention, the first reflecting surface 5 is formed to be inclined toward the display plate 3 as it is away from the light source 2. Can be reflected outward by the first reflecting surface 5, and the outside of the display panel 3 can be illuminated in a wide range. Thereby, it is possible to illuminate the display panel 3 while further suppressing uneven illumination.

In the above embodiment, the three light sources 2 are configured. However, a larger number of light sources 2 may be provided in accordance with the arrangement of the design 3 a of the display panel 3.
Moreover, although the case where the 2nd reflective surface 6 was comprised by the surface of the circuit board 50 which faces the 1st reflective surface 5 was demonstrated to the example, not only this but a new reflective surface was integrated with the case 60. Any material that faces the first reflecting surface 5 and can reflect the primary reflected light L1 toward the hole 7 may be used.
Moreover, this invention is not limited to said embodiment, It can implement in a various aspect.

The present invention can be applied to a display device incorporated in an instrument device mounted on a vehicle.

1 Display device 2 Light source (Light source for display panel)
3 Display board 3a Design 3b Substrate 4 Light-shielding member

4a Convex part

4b Disk part

4c Notch part 5 First reflective surface 6 Second reflective surface 7 Hole part 7a Arc-shaped hole 7b Connecting part 8 Fourth reflective surface 9 Third reflective surface 10 5th reflective surface 11 6th reflective surface 100 Instrument device 20 Pointer 20a Rotating shaft 20b Rotation center portion

20c Pointing portion

20d Pointer cap 20e Light receiving surface 20f Inclined surface 30 Pointer light source 40 Driving portion 40a Rotating shaft 50 Circuit board 60 Case (medium case)
60a Cylindrical part 60b Outer cylindrical part 60c Disk part L Light L1 from light source Primary reflected light L2 Secondary reflected light

Claims

A light source;
A display board for displaying a design by transmitting light from the light source;
A light shielding member that opposes the light source and shields part of the light to the display plate,
A first reflecting surface provided on the light shielding member and reflecting the light from the light source;
A second reflecting surface facing the first reflecting surface that reflects the primary reflected light reflected by the first reflecting surface further toward the display panel;
A hole that is provided through the light shielding member and allows the secondary reflected light reflected by the second reflecting surface to pass toward the display plate.
A display device characterized by that.
The hole includes a third reflecting surface that reflects the light directly from the light source in a direction other than the display plate.
The display device according to claim 1.
The hole is formed so that the light from the light source does not pass directly toward the display plate,
The display device according to claim 1, wherein the display device is a display device.
The light shielding member is formed such that the thickness of the outer end portion becomes thinner as it goes outward with the light source as the center.
The display device according to any one of claims 1 to 3.
The first reflecting surface is formed so as to be inclined toward the display plate side as the distance from the light source is increased.
The display device according to claim 1, wherein the display device is a display device.