JP2014048067A - Display unit - Google Patents

Abstract

A display device having a configuration capable of reducing the occurrence of pseudo lighting is provided.
The display device includes a light guide diffusion unit and a design display unit. The light guide diffusion unit 20 includes a light guide plate 21 and light diffusion units 22 and 23 that diffuse light from the first light source 61 guided by the light guide plate 21. The design display unit 10 transmits the light from the first light source 61 diffused by the light diffusing units 22 and 23 and emits it, and the indicator display unit 100 that is turned on and the second light source 62 emits the light. And a warning display unit 200 that is turned on when the light that has passed through is transmitted and emitted. The light diffusing units 22 and 23 are provided in the region overlapping the indicator display unit 100, but are not provided in the region overlapping the warning display unit 200, and the design display unit 10 is provided with the warning display unit 200. A low-transmittance portion 13 for covering is provided.
[Selection] Figure 3

Description

  The present invention relates to a display device.

  As a conventional display device, for example, there is one disclosed in Patent Document 1. The display device disclosed in Patent Document 1 is configured as a speedometer for an automobile or the like, introduces light from a light source, emits light, and diffuses the light emitted from the light guide member from the back side. And a scale plate (design display portion) that is transmitted and illuminated by the light diffused by the light diffusing plate (see FIG. 1 etc. of the same document).

JP 2003-270003 A

  In the configuration of the display device according to Patent Document 1, for example, the scale unit formed on the design display unit is configured as a lighting display unit that lights up (here, referred to as a first lighting display unit for convenience of explanation). Consider a case in which a second lighting display unit that is turned on by a light source independent of the light source that lights the scale unit is formed on the design display unit in addition to the scale unit. In this case, although the light source for turning on the second lighting display unit is turned off and the second lighting display unit is turned off, the light from the light source for lighting the first lighting display unit is diffused by the light diffusion plate, In some cases, the second lighting display section is lit (hereinafter, the fact that a lighting display section different from the desired lighting display section is lit unintentionally is referred to as “pseudo lighting”). If the simulated lighting occurs, the display quality of the display device is lowered, which is not preferable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device having a configuration capable of reducing the occurrence of pseudo lighting.

A display device according to the present invention includes:
A first light source;
The light from the first light source guided by the light guide plate is provided on at least one of the light guide plate that guides the light emitted from the first light source and the front side surface and the back side surface of the light guide plate. A light diffusing portion that diffuses, a light guide diffusing portion having
A second light source located on the back side of the light guide diffusion part;
A first lighting display unit for lighting and displaying the first design with the light from the first light source; a second lighting display unit for lighting and displaying the second design with the light from the second light source; And a design display part located on the front side of the light guide diffusion part,
The first lighting display unit transmits and emits the light from the first light source diffused by the light diffusing unit, thereby lighting and displaying the first design,
The second lighting display unit lights and displays the second design by transmitting and emitting the light emitted from the second light source and transmitted through the light guide plate,
The light diffusing unit is provided in a region overlapping the first lighting display unit when viewed from the normal direction of the front side surface or the back side surface of the light guide plate, but overlaps the second lighting display unit. Is not provided in the area,
The design display portion is provided with a low transmittance portion that covers the second lighting display portion when viewed from the normal direction, and the low transmittance portion is a second lighting display portion when it is not provided. Lower than the transmittance of the second lighting display portion when it is provided,
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus of the structure which can reduce generation | occurrence | production of pseudo lighting can be provided.

It is a top view of the instrument apparatus which concerns on one Embodiment of this invention. (A) is a top view of a design display part. (B) is a top view of a light guide diffusion part. It is an AA line schematic sectional drawing of the instrument apparatus shown in FIG. (A) is a figure for demonstrating the warning display part which concerns on a modification. (B) is a figure for demonstrating the light transmissive spreading | diffusion part which concerns on a modification.

  A display device according to an embodiment of the present invention will be described with reference to the drawings.

The display device according to an embodiment of the present invention is the instrument device 1 shown in FIG.
The instrument device 1 is mounted on a vehicle, and causes a user (mainly a driver of the vehicle) to send a predetermined measurement value (for example, a vehicle speed) by causing a pointer 50 and an index display unit 100 described later to be read in comparison. Inform. In addition, the instrument device 1 notifies the user of predetermined warning information by turning on a warning display unit 200 described later.

  In the following description, in order to facilitate understanding of the configuration of the instrument device 1, the user side viewing the instrument device 1 is the front side direction of the instrument device 1, and the opposite side is the back side direction. Will be described as appropriate. The front side direction corresponds to the upward direction of the paper in the schematic cross-sectional view of the meter device 1 shown in FIG. 3, and the back side direction corresponds to the downward direction of the paper in the schematic cross-sectional view of the meter device 1 shown in FIG.

  As shown in FIGS. 1 to 3, the instrument device 1 includes a design display unit 10, a light guide diffusion unit 20, a circuit board 30, a motor 40, a pointer 50, a first light source 61, and a second light source. 62, a holder 70, and a light guide 80.

  As shown mainly in FIGS. 2A and 3, the design display unit 10 includes a transparent plate 11, a light shielding unit 12, a low transmittance unit 13, and a light transmission diffusion unit 14, and displays an index. This is a part for expressing (displaying) the part 100 and the warning display part 200.

  The transparent plate 11 shown in FIG. 3 is a transparent plate member made of a predetermined resin material. The transparent plate 11 may be colorless and transparent or colored and transparent. As shown in FIGS. 2A and 3, the transparent plate 11 is formed with a through hole 11 a through which a rotation shaft 41 described later of the motor 40 passes. In FIG. 3, hatching indicating a cross section of the transparent plate 11 is omitted.

The light shielding part 12 is a layer formed by printing, painting, or the like on the back surface of the transparent plate 11 with light shielding ink or the like. The light shielding unit 12 is, for example, black or dark blue. The light shielding unit 12 may be a single color or may be formed of a plurality of colors.
The design display unit 10 represents the index display unit 100 and the warning display unit 200 in a portion where the light shielding unit 12 is not formed on the transparent plate 11. That is, the index display unit 100 and the warning display unit 200 are expressed in a so-called extracted character shape and have translucency.

The index display unit 100 is a part for notifying a user of a predetermined measurement value (for example, a vehicle speed) in cooperation with the pointer 50, and displays a design representing an index provided corresponding to a point indicated by the pointer 50.
Specifically, as shown in FIGS. 1 and 2A, the index display unit 100 according to the present embodiment includes a plurality of scales 101 and numbers 102 arranged in an arc shape so as to surround the pointer 50. . Although not shown, the index display unit 100 may include characters (for example, “km / h”) that represent units of measurement values, symbols, and the like.
As will be described later, the index display unit 100 displays the plurality of scales 101 and the numbers 102 with the light from the first light source 61 lit.

The warning display unit 200 is a part for displaying a design representing predetermined warning information (a part for notifying predetermined warning information).
Specifically, the warning display unit 200 includes a symbol 201 as shown in FIGS. 1 and 2A. In the present embodiment, the symbol 201 represents an exclamation mark that is lit when the vehicle side brake is applied. Although not shown, the warning display unit 200 may include other symbols, characters (including numbers), graphics, and the like.
As will be described later, the warning display unit 200 lights and displays the symbol 201 with the light from the second light source 62.

The low-transmittance portion 13 is a layer formed by, for example, printing or painting a smoke paint on the surface of the transparent plate 11 where the warning display portion 200 is formed. As shown in FIGS. 2A and 3, the low-transmittance portion 13 is a first region D1 that covers the location where the warning display portion 200 is formed in the main surface normal direction (vertical direction in FIG. 3) of the transparent plate 11. It is formed over. As an example, the low transmittance portion 13 is formed in a rectangular shape as shown in FIG. The low transmittance portion 13 may have other shapes, for example, may be formed in accordance with the shape of the symbol 201 of the warning display portion 200.
The low transmittance part 13 makes the transmittance of the warning display part 200 when it is provided lower than the transmittance of the warning display part 200 when it is not provided. The low transmittance portion 13 can illuminate the warning display unit 200 by sufficiently transmitting the light to the front side when the second light source 62 is turned on, but the warning display unit 200 is turned on when the second light source 62 is not turned on. The transmittance is appropriately adjusted so as to have a transmittance that is almost invisible (identified) to the user.

  The light transmission diffusion part 14 is a layer formed by printing, painting, or the like on a transparent plate 11 on the back side surface of the warning display part 200 formation portion. is there. As shown in FIGS. 2A and 3, the light transmission diffusion portion 14 is formed over the first region D <b> 1 that covers the place where the warning display portion 200 is formed in the main surface normal direction of the transparent plate 11. Yes. As an example, the first region D1 is a rectangular region shown in FIG. The first region D1 may have other shapes, for example, may be formed in accordance with the shape of the symbol 201 of the warning display unit 200.

  As described above, the design display unit 10 represents the index display unit 100 and the warning display unit 200. That is, the design display unit 10 displays the indicator display unit 100 that displays the plurality of scales 101 and the numbers 102 with the light from the first light source 61 and the symbol 201 with the light from the second light source 62. And a warning display unit 200.

  As shown in FIG. 3, the light guide diffusion unit 20 is located on the back side of the design display unit 10, and the light guide plate 21, the first light diffusion unit 22, the second light diffusion unit 23, and the first low refractive index. Part 24, second low refractive index part 25, and light shielding part 26.

The light guide plate 21 is a transparent plate member made of a predetermined resin material. Specifically, the light guide plate 21 includes a polycarbonate resin (with a light refractive index of about 1.6), an acrylic resin (with a light refractive index of about 1.49), and a silicon resin (with a light refractive index of about 1.49). 1.5) and the like.
The light guide plate 21 is formed with a through hole 21 a for allowing a rotating shaft 41 (described later) of the motor 40 to pass therethrough. Of the light guide plate 21, the inner wall portion 21 b that forms the through hole 21 a functions as a light incident portion that causes the light emitted from the light guide 80 to enter the light guide plate 21. In FIG. 3, hatching indicating a cross section of the light guide plate 21 is omitted.

  As shown in FIG. 3, the first light diffusing unit 22 and the second light diffusing unit 23 are formed by printing, painting, or the like on the surface of the light guide plate 21 with a light diffusing material. Is the layer to be played. The first light diffusing unit 22 is formed on the front surface of the light guide plate 21, and the second light diffusing unit 23 is formed on the back surface of the light guide plate 21. Of the first light diffusing portion 22 and the second light diffusing portion 23, at least the first light diffusing portion 22 on the front side is formed with translucency.

Note that the term “diffusion” as used herein appropriately includes changing the course of light by irregular reflection, scattering, refraction, reflection, or the like. For example, the first light diffusion unit 22 formed on the front surface of the light guide plate 21 diffuses light by scattering, refraction, or the like. Further, for example, the second light diffusion portion 23 formed on the back surface of the light guide plate 21 diffuses light by reflection, irregular reflection, scattering, etc. (formed on the above-described back surface of the transparent plate 11). The same applies to the light transmission diffusion portion 14).
As described above, the diffusing properties of the first and second light diffusing sections 22 and 23 can be changed as appropriate depending on the direction of the diffusing light in the front or back direction.

The first light diffusing unit 22 and the second light diffusing unit 23 respectively cover the portion where the indicator display unit 100 is formed in the main surface normal direction of the light guide plate 21 as shown in FIGS. 2 region D2. As an example, the second region D2 is formed in a substantially fan shape as shown in FIG. The second region D2 may have other shapes, for example, may be formed in accordance with the shape of each of the plurality of scales 101 and the numbers 102 constituting the indicator display unit 100.
The first light diffusing unit 22 and the second light diffusing unit 23 overlap the index display unit 100 of the design display unit 10 in the main surface normal direction of the light guide plate 21 (the same as the main surface normal direction of the transparent plate 11). Although it is provided in the area, it is not provided in the area overlapping with the warning display unit 200. The reason for this will be described later.

  The first low refractive index portion 24 and the second low refractive index portion 25 are provided so as to cover both surfaces of the light guide plate 21 on which the first light diffusion portion 22 and the second light diffusion portion 23 are formed. The first low refractive index portion 24 is provided on the front surface of the light guide plate 21, and the second low refractive index portion 25 is provided on the back surface of the light guide plate 21.

The first low refractive index portion 24 and the second low refractive index portion 25 are transparent layers formed by printing, painting, or the like using a synthetic resin having a lower light refractive index than the light guide plate 21 (colored transparent May be).
Specifically, the first low-refractive index part 24 and the second low-refractive index part 25 are made of acrylic resin (light refractive index is about 1.49), silicon resin (light refractive index is about 1.5). ), Tetrafluoroethylene, polytetrafluoroethylene (a kind of polyethylene, the refractive index of light is about 1.35), and the like. The first low refractive index portion 23 and the second low refractive index portion 24 may be formed of different materials.

The first low-refractive index portion 24 and the second low-refractive index portion 25 are formed with the index display portion 100 as seen from the normal direction of the main surface of the light guide plate 21 as shown in FIGS. Although it is formed so as to cover the place, it is not formed in the vicinity of the first region D1 (for example, as shown in FIG. 3, it is formed on the right side of the rotating shaft 41 in the figure, It is not formed on the left side).
That is, the first low-refractive index part 24 and the second low-refractive index part 25 are provided in a region overlapping with the index display part 100 of the design display part 10 in the main surface normal direction of the light guide plate 21. It is not provided in a region overlapping with the display unit 200. The reason for this will be described later.

Here, the light guided by the light guide plate 21 is totally reflected at the interface between the first low refractive index portion 24 and the light guide plate 21 or at the interface between the second low refractive index portion 25 and the light guide body 21. .
Total reflection means that when light is about to enter a small medium (first and second low refractive index portions 24, 25) from a medium having a large refractive index (light guide plate 21), the light to be incident on the interface. A phenomenon in which all (including almost all) of the light is reflected without being transmitted. Total reflection is an angle in which the incident angle of light is determined by the respective refractive indexes of adjacent media (here, the light guide plate 21 and the first low refractive index portion 24, and the light guide plate 21 and the second low refractive index portion 25). Occurs when it is larger than the angle.
Most of the light incident on the light guide plate 21 from the inner wall portion 21b reaches the first low refractive index portion 24 or the second low refractive index portion 25 at an incident angle larger than the critical angle. The light that reaches the interface with the first low refractive index portion 24 or the second low refractive index portion 25 is totally reflected.

  The light shielding portion 26 is formed with regions other than the second region D2 (that is, the first low refractive index portion 24, the second low refractive index portion 25, the first light diffusion portion 22, and the second light diffusion portion 23). This is a layer formed by printing, coating, or the like with light-shielding ink or the like on both surfaces (on the front surface and the back surface) of the light guide plate 21. The light shielding unit 26 is, for example, black or dark blue.

However, the light-shielding portion 26 is not formed in a region overlapping the design display portion 200 as viewed from the normal direction of the main surface of the light guide plate 21 (so-called blank character shape). Thereby, the light emitted from the second light source 62 can pass through the light guide diffusing unit 20 (light guide plate 21) and illuminate the warning display unit 200.
Specifically, as shown in FIG. 2B, the light shielding unit 26 is a symbol 201 that configures the warning display unit 200 in a region overlapping the warning display unit 200 when viewed from the main surface normal direction of the light guide plate 21. It is cut out in a shape that is one size larger than the shape of. Thereby, the area | region corresponding to the design display part 200 of the light guide diffusion part 20 is the 1st low-refractive-index part 24, the 2nd low-refractive-index part 25, the 1st light-diffusion part 22, and the 2nd light-diffusion part 23. In addition, it is a non-formation region U in which the light shielding portion 26 is not formed.

In the present embodiment, the design display unit 10 and the light guide diffusion unit 20 described above are configured as separate members. Here, that both are separate members means that the two can be physically separated before the instrument device 1 is assembled. That is, in this embodiment, the predetermined design is not formed by direct printing or the like on the light guide diffusion unit 20, and the design display unit 10 is provided mainly for displaying the predetermined design. The diffusing unit 20 is provided mainly for guiding light from the first light source 61, and the roles of both are different.
In FIG. 3, the design display unit 10 and the light guide diffusion unit 20 are schematically illustrated as being arranged at a predetermined interval in consideration of visibility, but both are in contact with each other. Also good.

  As shown in FIG. 3, the circuit board 30 is positioned on the back side of the light guide diffusion unit 20 with a predetermined interval. The circuit board 30 is formed of a printed circuit board on which a control unit (not shown) for controlling the operation of the entire instrument device 1 is mounted. The control unit includes a microcomputer including a CPU (Central Processing Unit) and the like. For example, a signal (vehicle speed) supplied from the outside of the instrument device 1 (for example, an ECU (Electronic Control Unit) of a vehicle on which the instrument device 1 is mounted). The motor 40 is driven and controlled in accordance with a signal indicating the like. Further, the controller causes the first light source 61 and the second light source 62 to emit light as appropriate.

  The motor 40 is formed of a stepping motor, for example, and is mounted on the circuit board 30. The motor 40 is attached to the base material of the circuit board 30 from the back side, and has a rotating shaft 41 that passes through a through hole 31 provided in the base material and extends in the front side direction. The motor 40 rotates the rotating shaft 41 under the control of the control unit described above. A pointer 50 is attached to the rotating shaft 41.

The pointer 50 rotates as the rotating shaft 41 rotates. The pointer 50 rotates on the front side of the design display unit 10 and indicates the scale 101 (or between the scales 101) of the index display unit 100. Since the control unit described above rotates the rotation shaft 41 of the motor 40 at a rotation angle corresponding to the vehicle speed data supplied from the outside, the pointer 50 can rotate at an angle corresponding to the vehicle speed to indicate the scale 101. it can.
The instrument device 1 informs the user of a measured value (for example, vehicle speed) by causing the pointer 50 and the index display unit 100 to be read in comparison.

The pointer 50 includes a light guide pointer portion 51 and a pointer cap 52.
The light guide pointer portion 51 is a portion that indicates the indicator display portion 100, is formed from a light guide material such as polycarbonate resin or acrylic resin, and emits light by light from the first light source 61. The light guide pointer 51 has a reflecting surface 51a that efficiently reflects light incident from the back side to the tip side (right side in FIG. 3) of the light guide pointer 51. The light guide pointer portion 51 of the pointer 50 is a portion attached to the rotating shaft 41 of the motor 40 (for example, press-fitted into the rotating shaft 41). In FIG. 3, hatching indicating a cross section of the light guide pointer 51 is omitted.
The pointer cap 52 is a member that covers the vicinity of the rotating shaft 41 of the light guide pointer portion 51 from above, and is formed of a predetermined resin material with a light shielding property. Thereby, it is suppressed that excess light leaks out from the light guide pointer part 51.

  The first light source 61 and the second light source 62 are made of, for example, LEDs (Light Emitting Diodes), and are mounted on the circuit board 30. The 1st light source 61 and the 2nd light source 62 are attached to the base-material front side of the circuit board 30, and radiate | emit light suitably in the front side direction by light-emitting suitably under control of the above-mentioned control part. In FIG. 3, both are shown one by one, but there may be a plurality.

The first light source 61 is provided to illuminate the pointer 50 and the index display unit 100. The first light source 61 emits white light, for example. How the first light source 61 illuminates the pointer 50 and the indicator display unit 100 will be described later.
The second light source 62 is provided to illuminate the warning display unit 200. For example, the second light source 62 emits red light. How the second light source 62 illuminates the warning display unit 200 will be described later.

  The holder 70 is located between the light guide diffusion unit 20 and the circuit board 30 and is a member made of, for example, a white synthetic resin. The holder 70 holds the light guide diffusion unit 20 on the front side. The back side of the holder 70 is attached to the circuit board 30.

The holder 70 is formed having a first illumination chamber 71 and a second illumination chamber 72 which are space portions independent of each other.
A first light source 61 is located in the first illumination chamber 71. Further, the holder 70 holds the light guide 80 in the vicinity of the first illumination chamber 71 (for example, an inner wall portion not shown). Thereby, as shown in FIG. 3, most of the light guide 80 is located in the first illumination chamber 71.
A second light source 62 is located in the second illumination chamber 72. The second illumination chamber 72 efficiently guides light from the second light source 62 to the front side.

  The light guide 80 is a substantially cylindrical light guide member (transparent member) made of polycarbonate resin, acrylic resin, or the like, and surrounds the rotation shaft 41 of the motor 40. In FIG. 3, hatching indicating a cross section of the light guide 80 is omitted.

A light receiving surface 81 that faces the first light source 61 and receives light from the first light source 61 is formed on the bottom surface of the light guide 80.
In addition, light that is substantially opposed to the light receiving surface 81 and incident from the light receiving surface 81 and guided to the front side is guided to the main surface (front surface or back surface) of the light guide plate 21. A reflecting surface 82 that efficiently reflects in the parallel direction is formed.
Further, on the side periphery of the upper end portion (upper end portion in FIG. 3) of the light guide 80, it faces the inner wall portion 21 b of the light guide plate 21, enters the light guide 80 from the light receiving surface 81, and is reflected by the reflecting surface 82. An emission surface 83 from which the emitted light (light from the first light source 61) is emitted is formed.

  The instrument device 1 has a housing (not shown) in addition to the one described above. This casing is a box-shaped member made of a predetermined resin, and includes the above-described parts (design display unit 10, light guide diffusion unit 20, circuit board 30, motor 40, pointer 50, first light source 61, The second light source 62, the holder 70, and the light guide 80) are accommodated. A transparent member made of glass or synthetic resin having visible light permeability is provided on the front side of the housing, and the design display unit 10 and the pointer 50 are visible.

  From here, how the first light source 61 illuminates the pointer 50 and the indicator display unit 100 and how the second light source 62 illuminates the warning display unit 200 are mainly illustrated. This will be described with reference to FIG.

(Lighting of the pointer 50 and the index display unit 100)
The light emitted from the first light source 61 is incident on the light receiving surface 81 of the light guide 80 facing the first light source 61. The light incident on the light receiving surface 81 is guided to the light guide 80, travels upward in FIG. 3, and reaches the reflecting surface 82.

  A part of the light reaching the reflecting surface 82 is not reflected by the reflecting surface 82 but goes upward as it is, passes through the through hole 21 a and the through hole 11 a, and is guided from the back surface of the light guide pointer portion 51 of the pointer 50. Incident on the part 51. The light that has entered the light guide pointer 51 is efficiently reflected by the reflecting surface 51 a and travels toward the tip of the light guide pointer 51. Thus, the light guide pointer 51 of the pointer 50 emits light by the light from the first light source 61.

On the other hand, the light that reaches the reflection surface 82 and is reflected by the reflection surface 82 is emitted from the emission surface 83 of the light guide 80. The light emitted from the emission surface 83 enters the light guide plate 21 from the inner wall portion 21 b of the light guide plate 21 facing the emission surface 83. The light incident on the light guide plate 21 repeats total reflection at the interface between the light guide plate 21 and the first low-refractive index portion 24 or between the light guide plate 21 and the second low-refractive index portion 25 and proceeds inside the light guide plate 21. (See the right side of the light guide 80 in FIG. 3). In this way, the light guide plate 21 guides the light emitted from the first light source 61. A part of the light traveling inside the light guide plate 21 reaches the second light diffusion portion 23. The light that reaches the second light diffusing unit 23 is diffused.
Of the light diffused by the second light diffusing unit 23, the light that has reached the first light diffusing unit 22 toward the front side (upper side in FIG. 3), and the first light diffusing unit without going through the second light diffusing unit 23 The light that has reached 22 passes through the first light diffusing unit 22 and is diffused by the first light diffusing unit 22. Here, the light whose incident angle with respect to the surface on the front side of the light guide plate 21 is smaller than the critical angle is not totally reflected, and the indicator display unit 100 via the first light diffusion unit 22 and the first low refractive index unit 24. Transparent. Thereby, the indicator display unit 100 is illuminated by the light from the first light source 61 (that is, the indicator display unit 100 is turned on).
In this way, the design represented by the light-shielding part 12 looks dark and the indicator display part 100 appears to shine.

(Lighting of warning display unit 200)
The light emitted from the second light source 62 reaches the back surface of the light guide plate 21.
Here, among the light emitted from the second light source 62, light that does not directly reach the light guide plate 21 also reaches the back surface of the light guide plate 21 by repeating reflection in the second illumination chamber 72. In this way, the light from the second light source 62 is reduced in light amount and efficiently reaches the back surface of the light guide plate 21.
The light reaching the back surface of the light guide plate 21 passes through the light guide plate 21 and travels toward the design display unit 10. In the light guide diffusing unit 20, a position that generally faces the second light source 62 is a non-formation region U in which the light shielding unit 26, the first light diffusing unit 22, the second light diffusing unit 23, and the like are not formed. Therefore, the light from the second light source 62 can pass through the light guide plate 21 and is not diffused by the first light diffusing unit 22 and the second light diffusing unit 23.
The light reaching the design display unit 10 transmits through the light transmission diffusion unit 14 and is diffused by the light transmission diffusion unit 14, and passes through the transparent plate 11 (that is, the area where the warning display unit 200 is formed) and the low transmission unit 13. To Penetrate. Thereby, the warning display unit 200 is illuminated by the light from the second light source 62 (that is, the warning display unit 200 is lit).
In this way, the design represented by the light-shielding part 12 looks dark and the warning display part 200 appears to shine.

  Here, the instrument device 1 turns off the second light source 62 and unintentionally turns on the warning display unit 200 by the light from the first light source 61 even when it is not desired to turn on the warning display unit 200. Therefore, the occurrence of pseudo lighting is effectively reduced. Hereinafter, how the instrument device 1 reduces the occurrence of simulated lighting will be described.

As described above, a part of the light emitted from the first light source 61 enters the light guide plate 21 from the inner wall portion 21b via the light guide 80.
Of the light incident on the light guide plate 21, the light traveling toward the indicator display unit 100 (see the right side of the light guide 80 in FIG. 3) is the light guide plate 21 and the first low refractive index portion 24 as described above. Or, the total reflection is repeated at the interface between the light guide plate 21 and the second low-refractive index portion 25, and the light travels efficiently inside the light guide plate 21, but the light traveling toward the warning display portion 200 side is guided in FIG. In the vicinity of the first region D1, the first and second low refractive index portions 24 and 25 are not formed and the light shielding portion 26 is formed. The inside of the light guide plate 21 does not proceed efficiently (for example, a part of the light traveling inside the light guide plate 21 toward the warning display unit 200 side is absorbed by the light shielding unit 26).
Here, for example, even if the light from the first light source 61 travels inside the light guide plate 21 and reaches the back side of the warning display unit 200, the position of the light guide diffusion unit 20 facing the warning display unit 200 is Since the first light diffusing portion 22 and the second light diffusing portion 23 are not formed, the light from the first light source 61 is not diffused toward the front side. It is difficult for the light to turn on the unit 200.
Further, the warning display unit 200 is provided with a low transmittance unit 13. Thereby, even if a part of the light from the first light source 61 contributes as light for turning on the warning display unit 200, it is considered that this is a very small amount of light. It is difficult to reach the user's eyes with sufficient transparency.
In this way, according to the meter device 1, the occurrence of pseudo lighting can be reduced (or eliminated). This effect is realized by the instrument device 1 having the following configuration.

  The instrument device 1 is provided on the first light source 61, the light guide plate 21 that guides light emitted from the first light source 61, and the front side surface and the back side surface of the light guide plate 21. A light guide diffusing section 20 having first and second light diffusing sections 22 and 23 for diffusing light from the first light source 61; a second light source 62 located on the back side of the light guide diffusing section 20; The indicator display unit 100 (an example of the first lighting display unit) that lights and displays the scale 101 and the numeral 102 (an example of the first design) with the light from the light source 61, and the symbol 201 with the light from the second light source 62. A warning display unit 200 (an example of a second lighting display unit) that lights up and displays (an example of a second design), and a design display unit 10 positioned on the front side of the light guide diffusion unit 20 The indicator display unit 100 includes light from the first light source 61 diffused by the first and second light diffusing units 22 and 23. By transmitting and emitting, the scale 101 and the number 102 are turned on and displayed, and the warning display unit 200 transmits and emits the light emitted from the second light source 62 and transmitted through the light guide plate 21. The symbol 201 is lit and displayed, and the first and second light diffusing units 22 and 23 are in a region overlapping the indicator display unit 100 when viewed from the normal direction of the front surface or the back surface of the light guide plate 21. Although provided, it is not provided in the area | region which overlaps with the said warning display part 200, and the low transmittance | permeability part 13 which covers the warning display part 200 seeing from the said normal line direction is provided in the design display part 10. The low transmittance portion 13 lowers the transmittance of the warning display portion 200 when it is provided, than the transmittance of the warning display portion 200 when it is not provided.

Further, the design display unit 10 includes a light transmission diffusion unit 14 that covers the warning display unit 200 when viewed from the normal direction and transmits and diffuses the light emitted from the second light source 62 and transmitted through the light guide plate 21. Is provided.
Accordingly, the warning display unit 200 is efficiently illuminated by the light from the second light source 62 while preventing the warning display unit 200 from being lit in a pseudo manner.

Further, first and second low refractive index portions 24 and 25 having a light refractive index lower than that of the light guide plate 21 are provided on the front side surface and the back side surface of the light guide plate 21, and the first and second low refractive indexes are provided. The rate parts 24 and 25 are provided in a region overlapping with the indicator display unit 100 when viewed from the normal direction, but are not provided in a region overlapping with the warning display unit 200.
As a result, light can be efficiently guided to the indicator display unit 100 as described above, while light that may contribute to simulated lighting can be prevented from being guided to the warning display unit 200 as much as possible.

Moreover, the light guide diffusion part 20 and the design display part 10 are separate members.
In this way, separate members are used, and the roles of both (mainly the role of displaying the design and the role of guiding the light from the first light source 61) are separated, so that both of the roles are given to one member. Compared with the case, the degree of freedom of design is increased. Thereby, it is also possible to enrich the design expression in the design display part 10, for example.

In addition, the instrument device 1 is positioned on the back side of the pointer 50 that rotates on the front side of the design display unit 10, and the light from the first light source 61 enters and guides the incident light to the light guide plate 21. The light guide plate 21 is formed with a through hole 21a through which the rotary shaft 41 of the pointer 50 passes, and the light guide 80 is formed from the inner wall portion 21b of the light guide plate 21 forming the through hole 21a. The emitted light enters the light guide plate 21, the first light source 61 is located on the back side of the light guide 80, the light guide 80 faces the first light source 61, and the light from the first light source 61 enters. A light receiving surface 81 (an example of an incident portion) that faces the inner wall portion 21b, and emits light from the first light source 61 that enters the light receiving surface 81 and is guided into the light guide 80. The indicator display unit 100 is connected to the inner wall 21b via the light guide 80. The scale 101 and the numeral 102 are turned on by transmitting and emitting the light from the first light source 61 that is guided to the light guide plate 21 and diffused by the first and second light diffusing sections 22 and 23. The meter device 1 displays the measured amount by comparing the pointer 50 with the index (scale 101, numeral 102).
According to such an instrument device 1, not only the pseudo lighting can be suppressed as described above, but also the pointer 50 and the indicator display unit 100 can be illuminated with a common light source (first light source 61). Therefore, it is possible to reduce the number of parts constituting the instrument device and to reduce the cost.

  In addition, this invention is not limited by the above embodiment and drawing. Changes (including deletion of components) can be made as appropriate without departing from the scope of the present invention. An example is shown below.

In the above description, in the design display unit 10, the warning display unit 200 is expressed in a so-called extracted character shape and has translucency, but is not limited thereto.
As shown in FIG. 4A, a translucent region may be formed so as to border the symbol 201 displayed by the warning display unit 200. Even in this case, the warning display unit 200 does not change the display by lighting the symbol 201 with the light from the second light source 62. Also in this case, the low transmittance part 13 and the light transmission diffusion part 14 may be formed in the first region D1 shown in FIG.
Although not shown, the indicator display unit 100 may be similarly formed with a translucent region so as to border each of the scale 101 and the numeral 102.

In the above description, the example in which the index display unit 100 and the warning display unit 200 are expressed by the area where the light shielding unit 12 is not formed in the design display unit 10 is shown, but the light shielding unit 12 is not formed. For example, it may be expressed by a region where translucent white printing or the like is formed.
Further, the light shielding portion 12 may be formed only on the front side surface of the transparent plate 11, or may be formed on both the front side surface and the back side surface of the transparent plate 11.

In the above description, the example in which the first light diffusing unit 22 and the second light diffusing unit 23 are both provided in the second region D2 has been described. However, the present invention is not limited thereto, and only one of them may be provided. In other words, the light diffusing portion may be provided on at least one of the front side surface and the back side surface of the light guide plate 21.
In addition, one or both of the first low refractive index portion 24 and the second low refractive index portion 25 may not be provided in the second region D2. For example, when it is desired to make the index display unit 100 shine more with the light from the first light source 61, one or both of the first low refractive index unit 24 and the second low refractive index unit 25 are omitted in this way. There are times when it is preferable.
Moreover, although the example which provided the light transmissive diffusion part 14 in the surface of the back side of the transparent plate 11 in the 1st area | region D1 was shown above, it is not restricted to this. The light transmission diffusion portion 14 may be provided on the front side surface of the transparent plate 11 or may be provided on both the front side surface and the back side surface of the transparent plate 11.

Further, the light transmission diffusion portion 14, the first light diffusion portion 22, and the second light diffusion portion 23 do not have to be formed by a printing layer or the like, and may be a film (sheet) -like member having light diffusibility. Good.
Further, the light transmission diffusion part 14, the first light diffusion part 22, and the second light diffusion part 23 may be formed directly on the transparent plate 11 or the light guide plate 25. FIG. 4B shows an example in which the light transmission diffusion portion 14 is directly formed on the surface of the transparent plate 11. The light transmission diffusion portion 14 is obtained by molding a dot pattern or the like composed of uneven portions directly on the surface of the transparent plate 11 by micro dots, imprinting, etching, or the like. Although not shown, the first light diffusing unit 22 and the second light diffusing unit 23 can have the same configuration.
Further, the light transmissive diffusing unit 14, the first light diffusing unit 22, and the second light diffusing unit 23 may be provided with light diffusing bubbles on the surface of the transparent plate 11 or the light guide plate 25.

  In the above description, an example in which the low transmittance portion 13 is formed on the front side surface of the transparent plate 11 is shown, but it may be provided on the back side surface, or may be provided on both the front side and the back side surface.

One of the first low refractive index portion 24 and the second low refractive index portion 25 may be omitted.
The light guide plate 21 may not be provided with both the first low refractive index portion 24 and the second low refractive index portion 25. Even if both are not provided, since the refractive index of light is lower than that of the light guide plate 21, the light guided to the light guide plate 21 is entirely at the interface between the light guide plate 21 and the air. Because it reflects. However, for example, when a medium (for example, dust) having a refractive index higher than that of the light guide plate 21 adheres to the surface of the light guide plate 21 or when the surface of the light guide plate 21 is scratched or the like, Light may be transmitted and absorbed, and as a result, the light guide efficiency of the light guide plate 21 may deteriorate. Therefore, it is preferable to provide both because the light guide efficiency can be improved as compared with the case where both are not provided.

In the above description, the light from the first light source 61 is taken in from the inner wall 21b of the light guide plate 21 through the light guide 80 in order to turn on the indicator display unit 100. I can't.
For example, light may be taken from the outer side surface (outer wall portion) of the light guide plate 21 (from the left end or the right end side in FIG. 3) to illuminate the indicator display unit 100 and the like. Further, the light source in this case is not limited to the LED, and may be composed of a cold cathode tube, an organic EL element, or the like.

  In the above description, the example in which the design display unit 10 and the light guide diffusion unit 20 are formed in a flat plate shape is shown, but the present invention is not limited thereto. As described above, since the light guide diffusing unit 20 and the design display unit 10 are separate members, the degree of freedom in design is high. For example, only the design display unit 10 is formed into a three-dimensional shape by pressure molding or drawing. Can also be processed.

  In the above description, an example in which the display device is the instrument device 1 mounted on a vehicle has been shown, but the present invention is not limited thereto. The instrument device 1 may be mounted on a vehicle (a ship, an aircraft, etc.) other than a vehicle, or may not be mounted on a vehicle. Furthermore, the display device is not limited to the instrument device 1. Any display device can be used as long as each of the first lighting display unit and the second lighting display unit that displays a predetermined design with an illumination structure similar to that described above is turned on by an independent light source. There may be (for example, an electric bulletin board, a clock, etc.).

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

DESCRIPTION OF SYMBOLS 1 Instrument apparatus 10 Design display part 11 Transparent board 11a Through-hole 12 Light-shielding part 13 Low-transmittance part 14 Light transmission diffusion part D1 1st area | region 100 Index display part 101 Scale 102 Number 200 Warning display part 201 Symbol 20 Light guide diffusion part 21 Light guide plate 21a Through hole 21b Inner wall portion 22 First light diffusion portion 23 Second light diffusion portion 24 First low refractive index portion 25 Second low refractive index portion D2 Second region 26 Light shielding portion 30 Circuit board 40 Motor 41 Rotation Axis 50 Pointer 61 First light source 62 Second light source 70 Holder 80 Light guide 81 Light receiving surface 82 Reflecting surface 83 Output surface

Claims (5)

A first light source;
The light from the first light source guided by the light guide plate is provided on at least one of the light guide plate that guides the light emitted from the first light source and the front side surface and the back side surface of the light guide plate. A light diffusing portion that diffuses, a light guide diffusing portion having
A second light source located on the back side of the light guide diffusion part;
A first lighting display unit for lighting and displaying the first design with the light from the first light source; a second lighting display unit for lighting and displaying the second design with the light from the second light source; And a design display part located on the front side of the light guide diffusion part,
The first lighting display unit transmits and emits the light from the first light source diffused by the light diffusing unit, thereby lighting and displaying the first design,
The second lighting display unit lights and displays the second design by transmitting and emitting the light emitted from the second light source and transmitted through the light guide plate,
The light diffusing unit is provided in a region overlapping the first lighting display unit when viewed from the normal direction of the front side surface or the back side surface of the light guide plate, but overlaps the second lighting display unit. Is not provided in the area,
The design display portion is provided with a low transmittance portion that covers the second lighting display portion when viewed from the normal direction, and the low transmittance portion is a second lighting display portion when it is not provided. Lower than the transmittance of the second lighting display portion when it is provided,
A display device characterized by that. The design display unit is provided with a light transmission diffusion unit that covers the second lighting display unit as viewed from the normal direction and transmits and diffuses light emitted from the second light source and transmitted through the light guide plate. Being
The display device according to claim 1. At least one of the front side surface and the back side surface of the light guide plate is provided with a low refractive index portion having a lower refractive index of light than the light guide plate,
The low refractive index portion is not provided in a region overlapping the second lighting display portion as viewed from the normal direction.
The display device according to claim 1 or 2. The light guide diffusion part and the design display part are separate members.
The display device according to claim 1, wherein the display device is a display device. A pointer that rotates on the front side of the design display section;
A light guide that is located on the back side of the pointer, receives light from the first light source, and guides the incident light to the light guide plate; and
The first lighting display unit is an index display unit that displays the first design representing an index provided corresponding to an indication location of the pointer,
The second lighting display unit is a warning display unit that displays the second design representing predetermined warning information,
The light guide plate is formed with a through hole that passes through the rotating shaft of the pointer, and light emitted from the light guide from the inner wall portion of the light guide plate forming the through hole enters the light guide plate.
The first light source is located on the back side of the light guide,
The light guide is opposed to the first light source, is incident on the light incident from the first light source, is opposed to the inner wall, is incident on the incident portion and is guided into the light guide. And an emission part that emits light from the first light source,
The first lighting display unit enters the inner wall through the light guide, is guided to the light guide plate, and transmits and emits light from the first light source diffused by the light diffusion unit. The first design is lit and displayed,
The display device is configured as an instrument device that notifies a measurement amount by comparing the pointer with the indicator.
The display device according to claim 1, wherein the display device is a display device.

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