JPWO2020145329A1 - Display device - Google Patents

Abstract

Provided is a display device capable of suitably reducing illumination unevenness of a transmission plate. A first light source which has a first region and a second region separated by a boundary 23 and is arranged in the first region and emits a first color, and a second light source which is arranged in a second region and emits a second color. Between the light source element that expresses the third color by lighting the first color and the second color at the same time, the transmission plate 40 that transmits the light of the light source element, and the transmission plate 40 and the light source element. The first reflecting surface 52, which is arranged and provided on the first region side and reflects the light of the light source element toward the first region side of the boundary 23, and the first reflecting surface 52 provided on the second region side and reflects the light of the light source element from the boundary. A reflection structure having a second reflection surface 53 that reflects on the second region side is provided. The transmission plate 40 is formed on the base material 41, the first region side of the boundary 23, the first correction layer 62 for correcting the first color to the third color, and the second region side of the boundary 23. It has a second correction layer 63, which is formed and for correcting the second color to the third color.

Description

The present invention relates to a display device for vehicles and the like.

The display device has a transmission plate that displays a design by being illuminated by light from a light source. As a technique for suppressing uneven illumination of the transmission plate, a technique for diffusing illumination light by providing a light diffusing member is known. For example, in the vehicle instrument disclosed in Patent Document 1, the light diffusing member 50 that diffuses the illumination light from the LED light source 62 is provided with a light-shielding portion 51 that blocks a part of the direct illumination light toward the display plate 4.

Japanese Unexamined Patent Publication No. 2011-997765

When an attempt is made to provide a structure such as the light-shielding portion described above, a certain distance is required to provide the light-shielding portion between the light source and the transmission plate. However, due to design restrictions, it may be difficult to provide a light-shielding portion because such a distance cannot be sufficiently obtained.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a display device capable of suitably reducing illumination unevenness of a transmission plate.

The display device according to the present invention has a circuit board, a first region and a second region separated by a boundary, and is arranged in the first region to emit a first color in order to solve the above-mentioned problems. A first light source and a second light source arranged in the second region and emitting a second color, and the third color is expressed by lighting the first color and the second color at the same time. A light source element mounted on one surface of the circuit board, a transmission plate arranged facing the one surface and transmitting the light of the light source element, and arranged between the transmission plate and the light source element. A first reflecting surface provided on the first region side and reflecting the light of the light source element toward the first region side from the boundary, and a first reflecting surface provided on the second region side and reflecting the light of the light source element. A reflection structure comprising a second reflective surface that reflects toward the second region side of the boundary, wherein the light source is on a substrate and a surface or back surface of the substrate, from the boundary. Is also formed on the first region side, and is on the front surface or the back surface of the base material and the first correction layer for correcting the first color to the third color. It is formed on the two-region side and has a second correction layer for correcting the second color to the third color.

In the display device according to the present invention, uneven illumination of the transmission plate can be suitably reduced.

The front view of the display device as an embodiment of this invention. The front view which shows the middle case and the circuit board of a display device. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. Configuration diagram of the light source element. Sectional drawing for demonstrating the printing layer of a transmission board. An explanatory diagram of how the light emitted by the light source element passes through the transmission plate. Explanatory drawing of a light source element and a reflective umbrella divided into three regions.

An embodiment of the display device according to the present invention will be described with reference to the accompanying drawings. The display device according to the present invention can be applied to a display device mounted on a vehicle such as an automobile or a two-wheeled vehicle, a ship, an agricultural machine, or a construction machine.

FIG. 1 is a front view of the display device 1 as an embodiment of the present invention.
FIG. 2 is a front view showing the inner case 33 and the circuit board 20 of the display device 1.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

In the following description, "front (front)", "rear (rear)", "top", "bottom", "right", and "left" are defined as "Fr.", "Fr." in FIGS. 1 and 3. Follow "Re.", "To.", "Bo.", "R", and "L".

The display device 1 is mounted in an instrument panel of a vehicle or the like. The display device 1 displays various information to the driver (visual person) via the speedometer 2 and the engine speedometer 3.

The display device 1 is mainly composed of a pointer 10, a circuit board 20, a case 30, and a transmission plate 40.

The pointer 10 is connected to a pointer shaft of a pointer drive unit provided on the circuit board 20, and rotates on a plane parallel to the plane of the transmission plate 40. The pointer 10 points to a scale or a number (not shown) formed on the transmission plate 40 according to the speed of the vehicle or the engine speed.

The circuit board 20 has, for example, a plate-shaped base material having an insulating property made of glass epoxy resin (Glass Fiber Reinforced Plastics), and various wirings printed on the base material. The circuit board 20 has, as necessary electronic components, for example, a light source element 21, a pointer driving unit, and resistors and capacitors constituting a circuit necessary for controlling these, and is electrically connected to these electronic components.

The light source element 21 is mounted on the front surface 20a (one surface) of the circuit board 20. A plurality of light source elements 21 are provided at positions corresponding to the band-shaped design 5. Here, FIG. 4 is a configuration diagram of the light source element 21. Each light source element 21 has an R region 24 as a first region and a GB region 25 as a second region separated by a boundary 23. The light source element 21 has a red light source 21r, a green light source 21g, and a blue light source 21b. The red light source 21r is a first light source that is arranged in the R region 24 and emits red as the first color. The green light source 21g and the blue light source 21b are second light sources that are arranged in the GB region 25 and emit green and blue as the second color. The light source element 21 expresses white as a third color by simultaneously lighting red, green, and blue.

The circuit board 20 has a control unit for controlling electronic components. The control unit has 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, for example, a program written in the ROM. The control unit controls, for example, the pointer drive unit, and causes the speedometer 2 and the engine speedometer 3 to display vehicle information such as the speed of the vehicle. The control unit acquires vehicle information from an external device of the display device 1 (for example, an ECU (Electronic Control Unit) of the vehicle), and controls the pointer drive unit based on the acquired information. Further, the control unit controls each light source 21r, 21g, 21b of the light source element 21 to emit light at a required timing and color.

The case 30 has a lower case 31, an upper case 32, and a middle case 33.

The lower case 31 and the upper case 32 are made of a resin (for example, polypropylene) such as black. The lower case 31 and the upper case 32 are fixed to each other by screws or hooks. As a result, the lower case 31 and the upper case 32 form an internal space, and the middle case 33, the circuit board 20, and the like are accommodated in this internal space.

The upper case 32 has an opening 32a covered with a protective cover 35. The protective cover 35 is a transparent flat plate provided to protect the speedometer 2, the engine speedometer 3, and the circuit board 20 inside the case 30 from the intrusion of dust and the like.

The middle case 33 is made of a synthetic resin (for example, polypropylene) such as white, is arranged on the circuit board 20, and supports the transmission plate 40 on the front surface. The middle case 33 has a reflective structure 50 at a position corresponding to the design 5. The reflection structure 50 reflects and diffuses the light emitted by the light source element 21 and guides it to the transmission plate 40. The reflection structure 50 has a horizontally long shape corresponding to the design 5 and has a box shape surrounding the light source element 21 in the front-rear direction. The reflection structure 50 is arranged between the transmission plate 40 and the light source element 21, and has a reflection umbrella 51 and a reflection bottom surface 55.

The reflective umbrella 51 is a quadrangular pyramid whose apex 54 faces rearward, and is an umbrella-shaped member having an inverted triangular cross-sectional shape. The reflecting umbrella 51 is provided at a position on the circuit board 20 corresponding to each light source element 21 at a position where the line connecting the boundary 23 and the inverted triangular apex 54 substantially coincides with each other.

The reflecting umbrella 51 has an R-side reflecting surface 52 as a first reflecting surface and a GB-side reflecting surface 53 as a second reflecting surface. The R-side reflective surface 52 is a surface located on the right side of the apex 54 (boundary 23) and faces the R region 24 side of the light source element 21. The R-side reflecting surface 52 mainly reflects the light of the light source element 21 emitted from the red light source 21r toward the R region 24 side of the boundary 23. The GB-side reflective surface 53 is a surface located on the left side via the apex 54 and faces the GB region 25 side of the light source element 21. The GB-side reflecting surface 53 mainly reflects the light of the light source element 21 emitted from the green light source 21g and the blue light source 21b toward the GB region 25 side of the boundary 23.

The reflection bottom surface 55 reflects the light reflected by the R side reflection surface 52 and the GB side reflection surface 53 to the transmission plate 40 side (front side). The reflection bottom surface 55 has a protrusion 56 at substantially the center between the adjacent reflection umbrellas 51. The protrusion 56 mainly reflects the light reflected between the reflecting bottom surface 55 and the transmitting plate 40, and the light reflected by the R-side reflecting surface 52 and the GB-side reflecting surface 53 toward the transmitting plate 40 side.

The transmission plate 40 displays the design 5 by guiding the illumination light of the light source element 21 to the transmission plate 40. Further, by guiding the illumination light of a light source other than the light source element 21 to the transmission plate 40, the design of the scale, numbers, letters, symbols, etc. of the speedometer 2 and the engine speedometer 3 printed and formed in the shape of a blank character can be obtained. Display it or make it stand out by lighting. The transmission plate 40 has a base material 41 and a printing layer 42. The base material 41 is a plate-shaped member made of, for example, a transparent (translucent) synthetic resin (for example, polycarbonate). The print layer 42 is formed by printing on a required area on the back surface side (or front surface side) of the base material 41 with an ink having a required color. The print layer 42 has a light-shielding region printed with a light-shielding ink and a transmission region printed with a transparent ink. In particular, the transmission region has a design 5 for transmitting the light of the light source element 21 and expressing a white (third color) band.

FIG. 5 is a cross-sectional view for explaining the print layer 42 of the transparent plate 40.

The print layer 42 has a rear white layer 61, white correction layers 62 and 63, a black layer 64, and a front white layer 65 from the rear side to the front side.

The rear white layer 61 and the front white layer 65 are layers printed with white transparent ink in order to express the white strip-shaped design 5. The posterior white layer 61 and the anterior white layer 65 are formed so as to overlap with the white correction layers 62 and 63.

The black layer 64 is a layer printed with black ink provided in the vicinity of the light source element 21. The black layer 64 is provided in the vicinity of the light source element 21 in order to reduce the brightness of the transmitted light in a region where the brightness is higher than that of a portion distant from the light source element 21. Therefore, it is preferable that the black layer 64 is provided at a position where light directly directed to the transmission plate 40 passes without being reflected by the reflecting umbrella 51.

Since the rear white layer 61, the front white layer 65, and the black layer 64 are layers provided to express the design 5 in a desired white color, any of the layers is omitted depending on the desired white color. You may.

The white correction layers 62 and 63 include an R-side correction layer 62 as a first correction layer and a GB-side correction layer 63 as a second correction layer.

The R-side correction layer 62 is a printing layer on the right side of the boundary 23 and formed on the R region 24 side of the light source element 21. The R-side correction layer 62 is in the vicinity of the red light source 21r of the light source element 21 and in order to correct red to white as a third color in a region that transmits more red light than other parts. It will be provided. The R-side correction layer 62 is a substantially white layer in which blue-green (cyan) as a complementary color of red is blended in white. The complementary color refers to one color and the other color when two colors are mixed at a constant ratio to become white. Such an R-side correction layer 62 is a position through which the light emitted by the red light source 21r directly directed to the transmission plate 40 without being reflected by the reflecting umbrella 51 passes, and is preferably provided in the vicinity of the light source element 21.

The GB side correction layer 63 is a printing layer formed on the GB region 25 side of the light source element 21 on the left side of the boundary 23. The GB-side correction layer 63 corrects blue-green to white in a region near the green light source 21g and the blue light source 21b of the light source element 21 and transmitting more light of the blue-green component than other portions. Provided for. The GB-side correction layer 63 is a substantially white layer in which red as a complementary color of blue-green is blended with white. Such a GB side correction layer 63 is provided at a position where the light emitted by the green light source 21g and the blue light source 21b directly directed to the transmission plate 40 without being reflected by the reflecting umbrella 51 passes, and is provided in the vicinity of the light source element 21. Is preferable.

The R-side correction layer 62 is formed so as to overlap the R-side reflective surface 52 (reflecting umbrella 51) in the surface direction (left-right direction) of the transmission plate 40. Similarly, the GB side correction layer 63 is formed so as to overlap with the GB side reflection surface 53 in the surface direction of the transmission plate 40. As a result, a manufacturing deviation occurs between the position of the reflecting umbrella 51 and the position of the printing layer 42 of the transmitting plate 40, and between the reflecting umbrella 51 and the white correction layers 62 and 63 in the plane direction of the transmitting plate 40. It is possible to reduce the occurrence of gaps. The same applies to the black layer 64.

Further, a gap 67 is formed in the surface direction of the transmission plate 40 between the R-side correction layer 62 and the GB-side correction layer 63 and between the black layer 64, which are arranged so as to face each other via the reflective umbrella 51 (boundary 23). Will be done. As a result, it is possible to prevent the brightness from being unnecessarily lowered in front of the reflecting umbrella 51 in which the light of the light source element 21 is difficult to reach.

Next, the operation of the display device 1 when displaying the design 5 will be described.

FIG. 6 is an explanatory diagram of how the light emitted by the light source element 21 passes through the transmission plate 40. In FIG. 6, the light emitted by the red light source 21r is shown by a coarse dotted line, and the light emitted by the green light source 21g and the blue light source 21b is shown by a fine dotted line.

In the light source element 21, the red light source 21r is arranged on the right side of the boundary 23. Further, in the reflection structure 50, the R-side reflection surface 52 is arranged on the right side via the boundary 23. Therefore, a part of the light 71 emitted by the red light source 21r is reflected by the reflection surface 52 on the R side and further reflected by the reflection bottom surface 55 on the R region 24 side toward the transmission plate 40 side. The other light 72 emitted by the red light source 21r goes directly to the transmission plate 40 without being reflected by the reflection surface 52 on the R side. Since the light 72 is emitted from the transmission plate 40 without being attenuated by reflection, the red component is stronger than that of the light 71. In particular, when the distance between the light source element 21 and the transmission plate 40 is small, the red component is strong.

Here, as shown in FIG. 5, the print layer 42 of the transmission plate 40 has an R-side correction layer 62, which is a substantially white layer corrected in blue-green, in the optical path of the light 72 directly toward the transmission plate 40. .. By passing through the R-side correction layer 62, the light 72 having a strong red component is visually recognized by the viewer of the design 5 as a white color equivalent to the white color in which the light 71 is transmitted through the transmission plate 40 and visually recognized. NS.

Similarly, the green light source 21g and the blue light source 21b are arranged on the left side of the boundary 23. Further, in the reflection structure 50, the GB side reflection surface 53 is arranged on the left side via the boundary 23. Therefore, a part of the light 81 emitted by the green light source 21g and the blue light source 21b is reflected by the GB side reflecting surface 53 and further reflected by the reflecting bottom surface 55 on the GB region 25 side toward the transmission plate 40 side. The other light 82 emitted by the green light source 21g and the blue light source 21b heads toward the transmission plate 40 without being attenuated by reflection on the GB side reflecting surface 53. The light 82 has a stronger blue-green component than the light 81. The print layer 42 of the transmission plate 40 has a GB side correction layer 63, which is a substantially white layer corrected in red, in the optical path of the light 82 directly directed to the transmission plate 40. Therefore, the light 82 having a strong blue-green component passes through the GB side correction layer 63, and is equivalent to the white color that the light 81 passes through the transmission plate 40 and is visually recognized by the viewer of the design 5. It is visually recognized as white.

The white correction layers 62 and 63 have a range in which color unevenness between the design 5 illuminated by the light 71 and 81 and the design 5 illuminated by the light 72 and 82 is eliminated in the surface direction of the transmission plate 40. Is preferably formed up to.

As described above, the display device 1 can express uniform white color over the entire area of the band-shaped design 5 by having the transmission plate 40 having the white correction layers 62 and 63. Therefore, the display device 1 can suitably reduce the illumination unevenness of the transmission plate 40.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, in the above embodiment, the example in which the light source element has three light sources of red, green, and blue has been described, but it has two light sources (for example, red and blue, blue and green, and green and red). May be good. Further, although the example of white as the third color has been described, any color may be used as long as it can be expressed by mixing the color components of each light source.

Further, although the example in which the light source element is divided into two regions 24 and 25 by the boundary 23 has been described, the light source element may be divided into three regions. For example, FIG. 7 is an explanatory diagram of a light source element 21 and a reflecting umbrella 100 divided into three regions. The light source element 21 may arrange the light sources 21r, 21g, and 21b in the regions 91a, 91b, and 91c separated by the three boundaries 90a, 90b, and 90c, respectively. In this case, the reflecting umbrella 100 has a conical shape or a triangular pyramid shape shown in FIG. 7, and has three reflecting surfaces 101a, 101b, and 101c. Further, the print layer has a correction layer for correcting with complementary colors in the optical path of the light toward the transmission plate without being reflected by the reflection surfaces 101a, 101b, and 101c, respectively.

1 Display device 2 Speed meter 3 Engine rotation meter 5 Design 10 Guideline 20 Circuit board 20a Front surface 21 Light source element 21b Blue light source 21g Green light source 21r Red light source 23, 90a, 90b, 90c Boundary 24 R area 25 GB area 30 Case 31 bottom Case 32 Upper case 32a Opening 33 Medium case 35 Protective cover 40 Transmission plate 41 Base material 42 Printing layer 50 Reflective structure 51, 100 Reflective umbrella 52 R side reflective surface 53 GB side reflective surface 54 Top 55 Reflective bottom 56 Projection 61 Rear white Layer 62 R side correction layer (white correction layer)
63 GB side correction layer (white correction layer)
64 Black layer 65 Front white layer 67 Gap 71, 72, 81, 82 Light 91a, 91b, 91c Region 101a, 101b, 101c Reflective surface

Claims (5)

With the circuit board
A first light source having a first region and a second region separated by a boundary, arranged in the first region and emitting a first color, and a second light source arranged in the second region and emitting a second color. , And a light source element mounted on one surface of the circuit board, which expresses the third color by lighting the first color and the second color at the same time.
A transmission plate arranged to face the one surface and transmitting the light of the light source element, and a transmission plate.
A first reflecting surface arranged between the transmission plate and the light source element, provided on the first region side, and reflecting the light of the light source element toward the first region side from the boundary, and the second reflecting surface. It is provided with a reflection structure provided on the region side and having a second reflection surface that reflects the light of the light source element toward the second region side from the boundary.
The transmission plate is
With the base material
A first correction layer formed on the surface or the back surface of the base material on the first region side of the boundary and for correcting the first color to the third color.
It has a second correction layer formed on the surface or the back surface of the base material on the second region side of the boundary and for correcting the second color to the third color. Display device. The third color printing layer formed on the front surface or the back surface of the base material so as to overlap with the first correction layer and the second correction layer, according to claim 1. Display device. Further provided with a middle case to support the circuit board
The display device according to claim 1, wherein the reflective structure is formed in the middle case. The first correction layer is formed so as to overlap the first reflective surface in the surface direction of the transmission plate.
The display device according to claim 1, wherein the second correction layer is formed so as to overlap the second reflective surface in the surface direction of the transmission plate. The display device according to claim 1, wherein the first correction layer and the second correction layer are formed with a gap in the surface direction of the transmission plate.

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