JP2019196094A - Display device for vehicle - Google Patents

Abstract

To provide a display device for a vehicle not spoiling an appearance, when viewing a display area obliquely.SOLUTION: A display device for a vehicle includes an indicator 14 for providing vehicle information to a driver by displaying an image on a display area, a circuit board 16 for transmitting a picture signal to the indicator 14, a lower case 17 having a recess for storing the indicator 14 and the circuit board 16, a nameplate 13 provided so as to cover the recess, and having a see-through part 13a formed of a translucent colored base material 131, and a low reflection treatment layer 134 provided visibly from the driver through the nameplate 13, in which the translucent colored base material 131 has a light transmittance of 33% or less.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device mounted on a vehicle.

  Conventionally, various display devices having improved visibility by providing a low reflection treatment layer as disclosed in Patent Document 1, for example, have been proposed. As the low reflection treatment layer, an AR (Anti Reflection) film, a moth-eye film that suppresses surface reflection by a fine uneven shape, and the like are known.

Japanese Patent Laid-Open No. 2017-181610

  The low reflection treatment layer has a lower reflectance when viewed from a position where the line-of-sight angle is 0 ° (position where the line of sight is perpendicular to the layer) than when the treatment is not performed. However, as the line-of-sight angle approaches 90 °, the reflectance increases, and the appearance looks whitish and the appearance may be impaired.

  An object of the present invention is to provide a vehicular display device that does not impair the appearance even when the vehicular display device is viewed obliquely, paying attention to the above-mentioned problems.

In order to achieve the above object, a vehicle display device according to the present invention includes:
Display means for providing vehicle information to the driver by displaying an image in the display area;
A circuit board for transmitting an image signal to the display means;
A housing having a recess for accommodating the display means and the circuit board;
A see-through member provided so as to cover the recess and having a see-through portion formed of a translucent colored substrate;
A low reflection treatment layer that is provided so as to be visible from the driver through the fluoroscopic member and suppresses reflection of light, and
The translucent colored substrate has a translucency of 33% or less.

  According to the present invention, it is possible to provide a vehicle display device that does not impair the appearance even when viewed from an oblique direction.

The figure which shows the external appearance at the time of vehicle mounting of the display apparatus of 1st embodiment of this indication. XX sectional drawing in FIG. (A) XX sectional drawing of the dial 13 of 1st embodiment. (B) The horizontal sectional view of the louver film 133 of a first embodiment. Sectional drawing of the display apparatus of 2nd embodiment. Sectional drawing of the dial 13 and the indicator 14 of 2nd embodiment.

Hereinafter, a display device (vehicle display device) of the present disclosure will be described as an example of an embodiment applied to a vehicle, and will be described with reference to the accompanying drawings.
As shown in FIG. 1, the display device 10 is mounted on a vehicle 1 and is assembled below a meter hood 2 formed on an instrument panel (instrument panel) in front of a driver who is a user of the vehicle 1. The display device 10 displays various information obtained from the outside of the display device 10 and provides it to the driver.

Further, the display device 10 includes two analog meters so that the driver can visually recognize them. The analog meter provides vehicle information such as the speed of the vehicle 1 and the engine speed. The display device 10 has a display 14 (display means) disposed in the center of the display device 10 so as to be visible when viewed from the user. The display 14 provides information including vehicle equipment maintenance information, route guidance information, vehicle information, and driving information to the driver in the information output direction based on an image displayed in the display area.
Further, the display device 10 is provided with a warning display unit 10d that notifies the abnormality or state of the vehicle equipment.

Next, the configuration of the display device 10 will be described in detail with reference to FIG.
The display device 10 includes a lens 11 (transparent member), a look 12, a dial 13 (transparent member), a display 14, an intermediate case 15, a circuit board 16, and a lower case 17 (housing).

  The lens 11 (transparent member) includes a hook 11a and a transparent portion 11b. For example, an acrylic resin can be applied. The driver can grasp the vehicle information by looking at the display device 10 through the fluoroscopic part 11b.

  In addition, the shape of the surface of the lens 11 that faces the driver projects a portion corresponding to the upper direction of the vehicle so that external light and the driver's own image are not reflected in the viewpoint direction of the driver. As a result, it has a shape that faces down the vehicle to prevent excessive reflection. Further, in the present disclosure, the shape of the surface of the lens 11 facing the driver is a shape facing the vehicle downward direction. However, this is a shape for preventing the above-described reflection, so that it is inclined at least on one side. If you do. Contrary to the present disclosure, a shape facing the vehicle upward direction may be used. Moreover, it is latched by the latching | locking part 12a formed in the turning-back 12 mentioned later by the hook 11a.

  The facing 12 is made of a light-shielding resin, and for example, polypropylene containing talc powder can be applied. Further, the turn-back 12 includes a wall portion having a hole shape that defines a visible portion of a dial described later, a locked portion that is locked to the lens 11, and a locking portion that locks a lower case 17 described later. Have. As for the shape of the wall portion, a portion corresponding to the upward direction of the vehicle protrudes for the purpose of locking the lens 11 as shown in the drawing and for the purpose of preventing the dial 13 described later from being illuminated by external light. As described above, since the inclination of the lens 11 is not limited to this, it is only necessary to protrude so as to follow the inclination of the lens 11.

The structure of the dial 13 will be described with reference to FIG.
The dial 13 (transparent member) includes a base material 131, a printing layer 132, a louver film 133 (light emission direction limiting layer), and a moth-eye film 134 (low reflection treatment layer). The driver can know the vehicle information by viewing the display 14 from the see-through portion 13a of the dial 13 which is a see-through member.

  The substrate 131 can be made of a plate-like light-transmitting and colored material (translucent colored substrate), and can be composed of a resin material or glass having a desired light-transmitting property, particularly by containing a smoke pigment. However, in the present disclosure, for example, a polycarbonate plate material in which the transmittance of vertically incident light is 30% by adding a smoke pigment is used.

  In this embodiment, for example, the light transmittance is set to 30%. A flat panel display such as a liquid crystal display uses a transparent resin base material for the exterior of its display area. In general, the surface of the resin blank material has a light reflectance (hereinafter referred to as reflectance). Is 4%, and AR (anti-reflection) processing is available as a means for realizing low reflectivity. This is a technique for suppressing reflection of light on the surface of the translucent material by adding a dielectric multilayer film to the surface of the translucent material, and the reflectance can be reduced to about 1%.

  As a technique for realizing higher low reflection performance than this, OB (Optical Carving) is known, and this has a reflectance of approximately 0.1%. However, there are many design restrictions and the applicable scenes are limited.

  Therefore, in the present disclosure, the transmissivity of the translucent colored base material used for the see-through portion 13a is such that a reflectivity of 0.1% equivalent to OB can be realized even when a low-reflection treatment layer having a reflectivity of 1% is used. Was set to 33% or less. The reflected light is external light and passes through the fluoroscopic part 11b twice when the external light enters the display device 10 and when it is emitted after reflection. In other words, by setting the transmissivity of 33% in the fluoroscopic part 11b, the absolute light quantity can be reduced to the square of 33%, approximately 10%, that is, one tenth, and the low reflection processing layer having a reflectivity of 1%. Even in the case of using, since only the absolute light amount corresponding to a reflectance of 0.1% is reflected from outside light, high low reflectivity is realized with a simple configuration. Therefore, the light transmittance is desirably 33% or less.

  In another aspect, the low reflection treatment layer may appear whitish when viewed from an oblique direction. This also has the effect of preventing deterioration in appearance. That is, the light transmittance of 30% is set in the see-through portion 11b at the time of vertical viewing, but when viewed from an oblique direction, the light transmittance is lower than this (looks dark). Specifically, β = α cos θ1, where α is the light transmittance and β is the light transmittance when viewed from the line of sight b angled from the normal a to the surface of the fluoroscopic part 11b by the line of sight angle θ1. Where cos is the cosine of a trigonometric function. As a result, as the line-of-sight angle θ1 increases, the low reflection treatment layer looks whitish, but since the transmissivity is reduced in the first place, the appearance is not deteriorated.

  In general, the lower limit of the light transmittance of the smoke pigment is 20%. This is because if it is less than this, it is difficult to visually recognize the display content of the display means.

  The print layer 132 is formed by applying a paint to the back surface of the substrate 131. A dark-colored paint is mainly applied, a paint is not applied to a visible portion of the display 14 described later, and a paint is printed outside the display area of the display 14. Further, the printing layer 132 forms the above-described scale part 10a by partially applying a paint having a different color, for example, a light-colored paint. A warning display portion 10d is formed on a part of the print layer 132. The warning display unit 10d is configured to have translucency because a predetermined character of the printing layer 132 is not printed in a letter shape.

  As shown in FIG. 3B, the louver film 133 (light emission direction limiting layer) is a film obtained by sandwiching a highly transparent silicone rubber 133b between a PC (polycarbonate) film 133a and a PC film 133d. 133b is a film in which black silicone rubber strips 133c are arranged at equal intervals so as to be perpendicular to the surface formed by the highly transparent silicone rubber 133b. It is affixed to the back surface of the base material 131 by OCA (Optical Clear Adhesive).

  The louver film 133 is a film having a function of blocking light transmitted in a predetermined oblique direction by the above configuration. The predetermined oblique direction in the present embodiment is an oblique direction with respect to the thickness direction of the black silicone rubber band 133c. As shown in FIG. 3 (b), the angle (line-of-sight angle) of the line of sight B with respect to the normal A of the film surface in the thickness direction component of the black silicone rubber band 133c is the ratio of the distance X to the width Y of the black silicone rubber band. When the arc tangent value (critical viewing angle θ2) is greater than or equal to, light passing through the film is blocked and the film appears black. It is desirable that the critical line-of-sight angle θ2 is smaller than the line-of-sight angle when the moth-eye film 134, which will be described later, and the low reflection treatment layer applied to the surface of the display 14 start to appear white.

  In the present embodiment, the black silicone rubber band 133c is provided so that the thickness direction thereof coincides with the left-right direction (horizontal direction) of the display device 10. As a result, the light incident on the louver film 133 is blocked when the horizontal component of the incident angle is equal to or greater than the predetermined angle (critical viewing angle θ2). Accordingly, while the driver who faces the display device 10 can visually recognize the information provided by the display device 14 or the analog meter, the meter display surface looks black by the louver film 133 from the left and right passengers.

  Moreover, the effect which reduces the possibility that the light radiate | emitted from the display apparatus 10 and not interrupted by the meter hood 2 may illuminate the window member and interior member mounted in the vehicle 1 which exist in the left-right direction of a display apparatus can also be achieved.

  The moth-eye film 134 is a film having a periodic structure on the surface that is shorter than the wavelength of light, such as the surface structure of a Moth-eye. When this is affixed to the surface of a translucent object, even if there is a difference in the refractive index between the material that constitutes the outer world of the film and the material that constitutes the translucent object, it is refracted in a pseudo manner by the periodic structure. It is a film that can suppress the reflection of light on the surface of a translucent object by gradually changing the rate. The moth-eye film 134 is affixed to the outermost back surface of the dial 13 using OCA.

  The moth-eye film 134 has a reflectance of less than 0.1% when irradiated with light rays with an incident angle of 0 °. However, when the incident angle is set to 60 °, for example, the low reflection performance cannot be maintained, and the appearance may appear whitish. Therefore, for example, a louver film 133 having a critical line-of-sight angle θ2 of 60 ° (specification for shielding light at approximately 30 ° with respect to the surface of the louver film 133) can be applied. Angle) is also the same as the critical viewing angle.

  The dial 13 has a resin ring member 10b and a pointer portion 10c on the surface facing the driver. The pointer portion 10c has a known rotating portion (not shown). For example, the rotation unit is configured by a stepping motor connected to a control unit 16c described later, and receives a predetermined pulse signal from the control unit 16c according to the vehicle speed and the engine speed, and performs rotation. Along with this rotation, the pointer portion 10c also rotates to form an analog meter that provides vehicle information to the driver based on the indications indicated by the scale portion 10a and the pointer portion 10c.

  Returning to the description of the configuration of the display device 10 shown in FIG.

  The display 14 includes image display means, and for example, a TFT liquid crystal module can be applied. The display unit 14 is connected to a control unit 16c, which will be described later, via an FPC (Flat Printed Cable), receives image information and luminance information transmitted by the control unit 16c, and updates or maintains information to be displayed at a predetermined image update cycle. In addition, the display 14 has an AR coating on the surface facing the driver including the display area.

  An AR coat is a low refractive index film having a refractive index lower than that of the substance located on the outermost surface of the surface, and a low refractive index layer having a relatively low refractive index and a high refractive index having a relatively high refractive index. This is a low reflection processing layer realized by applying a dielectric multilayer film in which layers are alternately laminated. For example, the processing method is a sputtering method or a CVD method.

  The middle case 15 is made of a light shielding resin material, and for example, polypropylene containing talc can be applied. The shape of the middle case 15 is a shape in which a concave portion that accommodates the indicator 14 and a hole portion through which a light beam that illuminates and transmits the warning display portion 10d passes.

  The middle case 15 has a partition wall that defines an optical path of a light beam that illuminates and transmits the warning display portion 10d. Of the partition walls, the dial 13 out of the partition walls adjacent to the first concave portion that accommodates the indicator 14 is provided. And the partition wall end 15a.

  The circuit board 16 can be, for example, a printed board in which a copper foil wiring pattern is printed on a plate-like glass epoxy material, and is arranged on the back surface of the middle case 15 (the back surface with respect to the bottom surface of the recess housing the display 14). Further, the circuit board 16 is provided with a light source 16b at a predetermined position on the surface (front surface) facing the driver, and a connector 16a and a control unit 16c are provided on the back surface. Although not shown, the image generated by the control unit 16c. An FPC connector for transmitting a signal to the display 14 is provided.

  The connector 16a is a connecting member in which a terminal exposed on the substrate is covered with a resin housing. A connector for connecting the display device 10 and a power source provided in the vehicle 1 or connecting the display device 10 and various ECUs (Electronic Control Units) provided in the vehicle 1 via a CAN (Controller Area Network). It is.

  The light source 16b is a light emitting body mounted on the circuit board 16, and for example, a light emitting diode can be applied. The light emitted by the voltage supplied from the circuit board 16 is transmitted and illuminated through the hole of the middle case 15 to the warning display unit 10d.

  The control unit 16c (control means) includes a storage unit that stores programs, input data, calculation progress, calculation results, and the like, a calculation unit that performs predetermined calculation processing based on information stored in the storage unit, and other devices. It can be constituted by a microcomputer provided with a connection interface. Vehicle information, route guidance information, etc. are received from various electronic devices connected to the outside of the display device 10 via the circuit board 16 and the connector 16a, and an image to be displayed on the display 14 is generated and transmitted to the display 14. Or vehicle information corresponding to the engine speed and vehicle speed at that time is transmitted to the analog meter.

  The lower case 17 is made of a light-shielding resin material, and has a concave portion that accommodates the dial plate 13, the display 14, the middle case 15, and the circuit board 16, and a locked portion that is locked to the turn 12. A hole for connecting the connector 16a to the outside of the display device 10 is provided.

  The display device 10 of the present disclosure is configured by the above structure.

  Next, a second embodiment of the display device according to the present disclosure will be described with reference to the illustrated example. In addition, about the component structure similar to the said embodiment, the same code | symbol is described and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the display device 10 of the second embodiment includes a lens 11 (transparent member), a display 14, an intermediate case 15, a circuit board 16, and a lower case (housing) 17. As in the present embodiment, a configuration in which the payback is eliminated may be used.

  In the first embodiment, the main effect of the present invention is realized by using the dial 13 as a see-through member and the base 131 as a translucent colored base. In the present embodiment, the lens 11 is a see-through member, and the base material used for the see-through portion 11b is a light-transmitting colored base material with a light transmittance set to 33% or less, achieving the main effects of the present invention. In short, the effect of the present invention can be achieved if a translucent colored base material having a transmissivity of 33% or less is provided on the upper output direction side from the low reflection treatment layer.

  FIG. 5 shows a cross-sectional view of the lens 11 and the display 14. As shown in FIG. 4, in the second embodiment, the lens 11 is provided with a printing layer 132 and a louver film 133. A moth-eye film 134 is provided on the display surface of the display 14 as a low reflection treatment layer.

  In the present embodiment, the black silicone rubber band 133c of the louver film 133 is attached so that the thickness direction is along the vertical direction. Thereby, among the light radiate | emitted from the display apparatus 10, the light whose angle which the normal line a of a film surface and the direction to radiate | emit in a vertical direction component makes more than predetermined is interrupted | blocked.

  Accordingly, it is possible to achieve an effect of reducing a possibility that the window member and the interior member of the vehicle 1 are illuminated by the emitted light without being blocked by the meter hood 2.

  Even if there is no low reflection processing layer in the transparent member as in this embodiment, the low reflection processing is performed on the transparent member (for example, the display 14) provided in the display device 10, and the driver and the low reflection processing are performed. If a light emission direction limiting layer is provided between the two, the appearance can be improved.

  In addition, for example, a light emission direction limiting layer 14b that blocks light having an emission angle of a predetermined value or more in either one of the vertical direction component and the horizontal direction component can be applied, and according to the assumed viewpoint movement of the driver. It should be selected.

  Further, as in this embodiment, the member provided with the light emission direction limiting layer is not limited to the see-through member, and is provided between the driver's viewpoint and the display means when the driver visually recognizes the display means. It only has to be done.

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

  For example, although a TFT liquid crystal module can be applied as the display 14, it can be applied to any display device capable of displaying information, for example, an organic EL display.

  Moreover, although the example which applied the moth-eye film as a low reflection process layer was shown, since it is a film which suppresses the reflection of the surface of a translucent object, AG (Anti Glare) film and AR film may be sufficient. Even in the AR coat, it may appear whitish as the line-of-sight angle approaches 90 °.

  In the present disclosure, the louver film is used as the light emission direction limiting layer, but the present invention can of course be achieved by using other light emission direction limiting layers. The effect of the present invention can be achieved as long as it is a light emission direction limiting layer capable of blocking only light having a predetermined emission angle. For example, the light emission direction limiting layer may be a light emission direction limiting layer obtained by combining a polarizing plate and an inclination having incident angle characteristics thereafter with a retardation plate. The retardation plate having the incident angle characteristic transmits, for example, linearly polarized light incident perpendicularly to the layer, and linearly polarized light having an incident angle of a predetermined angle or more gives a phase difference of ½ wavelength. There is a film that acts as a retardation plate that rotates about a polarization axis perpendicular to the polarization axis before incidence. What stuck the polarizing plate to this film is applicable as a light emission direction limiting layer. By providing as a light emission direction limiting layer so that the surface on which the polarizing plate is affixed faces the driver and the axis of the polarizing plate coincides with the polarization axis of the linearly polarized light before incidence, it is perpendicular to the layer A light beam incident on the light beam is transmitted, and a light beam having an incident angle of a predetermined angle or more has a phase difference and is blocked by the polarizing plate.

  Further, in the present disclosure, the light emission direction limiting layer has been described using the light emission direction limiting layer that exhibits a light shielding characteristic that is symmetric with respect to the normal direction of the layer. For example, it may be a light emission direction limiting layer that blocks only light whose emission angle is higher than a predetermined emission angle in the vertical direction component. In this case, there is an action that does not impair the appearance even when looking in from above, and it is also possible to prevent light irradiation to the window member and interior member provided in the upward direction.

  Further, in the present disclosure, the dial 13 and the display 14 of the display device 10 have been described so that the surface visually recognized by the driver is vertical, but each member is designed with an inclination in accordance with the implementation. Of course, the effect of the present disclosure can be exhibited even in such a case.

  Further, in the present disclosure, a configuration in which a control unit including a microcomputer is mounted on a circuit board and display control of the display unit is shown. However, an image signal generated by the control unit is configured by configuring the control unit outside the housing. May be configured to display and drive. For example, the control means provided in the center information display mounted on the vehicle is configured to generate an image displayed on the vehicle display device, head-up display, and center information display of the present disclosure disposed in the meter hood. There may be.

1 Vehicle 10 Display Device (Vehicle Display Device)
10a Scale part 10b Ring member 10c Pointer part 10d Warning display part 11 Lens (transparent member)
11a Hook 11b See-through part 12 Look-back 12a Locking part 13 Dial (see-through member)
131 Substrate 132 Printed layer 133 Louver film (light emission direction limiting layer)
133a PC film 133b Highly transparent silicone rubber 133c Black silicone rubber strip 133d PC film 134 Moth eye film (low reflection treatment layer)
14 Display (display means)
15 middle case 16 circuit board 16a connector 16b light source 16c control means 17 lower case (housing)
2 Meter hood

Claims (5)

Display means for providing vehicle information to the driver by displaying an image in the display area;
A circuit board for transmitting an image signal to the display means;
A housing having a recess for accommodating the display means and the circuit board;
A see-through member provided so as to cover the recess and having a see-through portion formed of a translucent colored substrate;
A low reflection treatment layer that is provided so as to be visible from the driver through the fluoroscopic member and suppresses reflection of light, and
The said translucent colored base material is a display apparatus for vehicles whose translucency is 33% or less. The vehicle display device according to claim 1, further comprising a control unit that generates the image based on the vehicle information received from the vehicle. The display device for a vehicle according to claim 1, wherein the see-through member is provided with the low reflection treatment layer on a back surface. The vehicle display device according to claim 1, wherein the display unit includes the low reflection treatment layer in a display area. The vehicle display device according to claim 1, wherein a light emission direction limiting layer is provided on an information output direction side of the low reflection treatment layer.

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