JP2021172237A - On-vehicle display device - Google Patents

Abstract

To provide an on-vehicle display device which can detect the state of a viewer.SOLUTION: An on-vehicle display device comprises: a display element 11 which displays prescribed information; and an optical member 12 which is arranged on the front side of the display element 11 and has an infrared light reflecting function that can reflect the infrared light L1, L3 irradiated with from an infrared light irradiation unit 22. The infrared light L1 is reflected by the optical member 12 to be irradiated with toward the front side as primary reflected infrared light L2, and the infrared light L3 after irradiating a viewer E is reflected by the optical member 12 to be incident on imaging means 21 as secondary reflected infrared light L4.SELECTED DRAWING: Figure 2

Description

The present invention relates to an in-vehicle display device mounted on various vehicles such as automobiles.

Conventionally, as an in-vehicle display device of this type, for example, one described in Patent Document 1 below is known. The in-vehicle display device described in Patent Document 1 is a vehicle instrument mounted in front of the driver's seat of the vehicle, and includes a liquid crystal display panel (display unit) that displays various vehicle information such as the traveling speed of the vehicle. , Mainly composed of a resin case member for accommodating a liquid crystal display panel.

JP-A-2018-54291

In recent years, a camera module that captures the face of an occupant (viewer) who sits in the driver's seat of a vehicle and visually recognizes the liquid crystal display panel, and detects the state (behavior) of the occupant from the movement of the driver's face, etc. Attention is being paid to the practical application of the technology of mounting it in (appropriate places in the vehicle). By the way, in the vehicle-mounted display device described in Patent Document 1, it is not assumed that the camera module is mounted on the vehicle-mounted display device or its periphery in order to detect the state of the occupant. There was room for improvement.
Therefore, an object of the present invention is to provide an in-vehicle display device capable of detecting the state of a viewer in order to deal with the above-mentioned problems.

INDUSTRIAL APPLICABILITY The present invention includes a display unit that displays predetermined information and infrared light that is arranged on the viewer side of the display unit and emitted from the infrared irradiation unit when viewed from the viewer side who visually recognizes the display unit. The infrared light is reflected by the optical member and irradiated toward the viewer side, and the infrared light after irradiating the viewer is provided with an optical member having an infrared light reflection function capable of reflecting the infrared light. Is configured to be reflected by the optical member so that it can be incident on the imaging means.

Further, the present invention has a display unit that displays predetermined information and infrared rays that are arranged on the viewer side of the display unit and emitted from the infrared irradiation unit when viewed from the viewer side who visually recognizes the display unit. It is provided with an optical member having an infrared light reflection function capable of reflecting light, and the infrared light is reflected by the optical member and irradiated toward the viewer side, and the infrared ray after irradiating the viewer. It is characterized in that the light is configured so as to be incident on the imaging means.

Further, the present invention includes a display unit that displays predetermined information and an optical member that is arranged on the viewer side of the display unit and has an infrared light reflection function when viewed from the viewer side who visually recognizes the display unit. The infrared light emitted from the infrared irradiation unit is irradiated toward the viewer side, and the infrared light after irradiating the viewer is reflected by the optical member so that it can be incident on the imaging means. It is characterized by being configured.

Further, the present invention is characterized in that the imaging means is provided on the steering column of the vehicle.

The present invention also includes a case member for accommodating the display unit, and the optical member is a hot mirror provided so as to form a pair with the case member.

Further, the present invention is characterized in that the display unit is an organic EL panel.

According to the present invention, it is possible to provide an in-vehicle display device capable of achieving a desired object and detecting a state of a viewer.

The figure which shows the required part of the vehicle interior when looking forward from the occupant (viewer) side according to the embodiment of this invention simply. A cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view of an in-vehicle display device according to a modified example of the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the following description, the viewer side that directly views (visualizes) the in-vehicle display device (particularly the display element described later) is defined as the front side (front side), and the anti-viewer side that is the opposite side to the viewer side. Is defined as the back side (rear side). The viewer here means a occupant (of the vehicle) who is seated in the driver's seat of the vehicle so as to visually recognize the in-vehicle display device.

In FIG. 1, the in-vehicle display device according to the present embodiment includes, for example, a display unit 10 provided inside an instrument panel (instrument panel) D located in front of the driver's seat of a vehicle, and a steering column S also located in front of the driver's seat. It is mainly composed of the camera module 20 mounted on the top. In FIG. 1, reference numeral 30 denotes a windshield of a vehicle. The display unit 10 may be arranged on the instrument panel D instead of inside the instrument panel D extending in the vehicle width direction (in the direction of arrow C in FIG. 1).

As shown in FIG. 2, the display unit 10 has a display element 11 as a display unit for displaying predetermined information, and a viewer E side of the display element 11 when viewed from the viewer E side who visually recognizes the display element 11 (that is, the display unit 10). An optical member 12 arranged on the front side), a circuit board 13 provided behind the display element 11 so as to be parallel to the display element 11, and a resin material accommodating the display element 11 and the circuit board 13. It includes a case member 14.

As the display element 11, a display medium which is a substantially rectangular flat plate-shaped organic EL panel (self-luminous display element) arranged so that the display surface faces the front side can be applied. Examples of the information displayed on the display element 11 include various vehicle information including vehicle speed information indicating the traveling speed of the vehicle. The display element 11 may be a liquid crystal display panel which is a light receiving type display element instead of the organic EL panel.

The optical member 12 is a hot mirror provided with a light-transmitting substrate 12a made of a substantially rectangular acrylic resin and a reflective layer 12b made of a multilayer interference film provided on the front side of the substrate 12a, and is a camera module. It has an infrared light reflection function capable of reflecting infrared light emitted from the infrared irradiation unit described later in 20.

Further, the optical member 12 has a visible light transmission function capable of transmitting the predetermined information displayed as visible light. Therefore, the viewer E who visually recognizes the display unit 10 can visually recognize the predetermined information through the optical member 12. The outer shape of the substrate 12a of the optical member 12 provided so as to cover the display element 11 is one size (slightly) larger than the outer shape of the display element 11, and the front side of the substrate 12a is flat. It may be a non-flat shape composed of convex or concave surfaces having a predetermined curvature, instead of a flat shape.

The circuit board 13 is, for example, a hard wiring board in which a glass epoxy base material is provided with a predetermined wiring pattern, and the control unit 13a for controlling the display element 11 and various circuit components such as resistors and capacitors are described above. It is electrically connected to the wiring pattern. The circuit board 13 is electrically connected to the display element 11 by using a conductive means as appropriate.

The case member 14 is, for example, a resin case made of a synthetic resin material, has a substantially concave shape in which the display element 11 side (front side) is open, and has a bottom wall portion 14a that covers the back side of the display element 11. It has a side wall portion 14b that covers the side of the display element 11. The optical member 12 is arranged so as to close the front opening 14c located on the front side of the case member 14. That is, this means that the optical member 12 is provided so as to form a pair with the case member 14.

The camera module 20 captures the face of the viewer E sitting in the driver's seat and detects the state (behavior) of the viewer E from the movement of the face of the viewer E and the like, and is located on the front side of the display unit 10. It is installed on a steering column S. The camera module 20 includes an imaging means 21 capable of imaging the state of the viewer E who visually recognizes the display unit 10, and an infrared irradiation unit 22 that irradiates infrared light (near infrared light).

The imaging means 21 is a camera having sensitivity in the near infrared region, and is provided on the steering column S of the vehicle. The imaging means 21 here is placed on the steering column S so that the portion that receives infrared light (the infrared light here means secondary reflected infrared light, which will be described later) faces the optical member 12 side. It is configured to be placed. With this configuration, the viewer E does not directly visually recognize (recognize) the above-mentioned portion of the imaging means 21 that receives infrared light, so that the presence of the imaging means 21 is less likely to be noticed. There is.

The infrared irradiation unit 22 can apply one or a plurality of infrared light sources (infrared LEDs) provided on the steering column S of the vehicle in a state of being juxtaposed with the image pickup means 21. In this case, the infrared light emitted from the infrared irradiation unit 22 is reflected by the optical member 12 and irradiated toward the viewer E side, and the infrared light after irradiating the viewer E is again emitted by the optical member 12. It is configured so that it can be reflected and incident on the imaging means 21.

More specifically, the infrared light L1 emitted from the infrared irradiation unit 22 reaches the reflection layer 12b (optical member 12), and the infrared light L1 reaching the reflection layer 12b emits the infrared light. It is reflected toward the front side as the primary reflected infrared light L2 by the reflecting layer 12b (optical member 12) having a reflecting function, and reaches the face of the viewer E.

Further, the infrared light L3 after irradiating the viewer E (the face of the viewer E) is reflected backward so as to follow the optical path opposite to the optical path of the primary reflected infrared light L2 described above, and the reflective layer 12b ( The infrared light L3 that reaches the optical member 12) and reaches the reflection layer 12b is configured to be incident on the imaging means 21 as the secondary reflected infrared light L4 by the reflection layer 12b (optical member 12). .. The optical path of the secondary reflected infrared light L4 follows an optical path opposite to that of the primary reflected infrared light L2 described above. As a result, the imaging means 21 can image the face of the viewer E illuminated by the infrared light, and acquires the indirectly reflected secondary reflected infrared light L4 described above as an image.

The control unit 13a determines the state of the viewer E based on the image captured by the imaging means 21. Specifically, the control unit 13a is in a state in which the viewer E is inattentive operation depending on whether or not the viewer E is in a drowsy state based on the image captured by the image pickup means 21. A process of determining the state of the viewer E, such as whether or not, is executed.

When, for example, the control unit 13a determines that the viewer E is in a drowsy state, a warning sound ("" The process of operating the speaker is executed so that the sound effect (sound effect of "pee") is emitted. Instead of sounding the warning sound, a warning message may be displayed on the display element 11 under the control of the control unit 13a to call attention.

As described above, in the present embodiment, the display element 11 that displays the predetermined information and the infrared light L1 and L3 that are arranged in front of the display element 11 and that can reflect the infrared light L1 and L3 emitted from the infrared irradiation unit 22 are red. An optical member 12 having an external light reflection function is provided, and the infrared light L1 is reflected by the optical member 12 and irradiated toward the front side as primary reflected infrared light L2, and the viewer E is irradiated with infrared rays after irradiation. The light L3 is configured to be reflected by the optical member 12 so as to be incident on the imaging means 21 as the secondary reflected infrared light L4.

Therefore, even when an optical member 12 having an infrared light reflection function is provided on the front side of the display element 11 and the camera module 20 is installed on the steering column S located on the front side of the optical member 12, the image is captured. The state of the viewer E can be detected based on the image captured by the means 21.

The present invention is not limited to the above-described embodiments and drawings. Changes (including deletion of components) can be made to the embodiments and drawings as appropriate without changing the gist of the present invention.

For example, in the above-described embodiment, both the imaging means 21 and the infrared irradiation unit 22 are installed on the steering column S, but in the infrared irradiation unit 22, the infrared light L1 is an optical member 12. The imaging means 21 can be arranged at any position in the vehicle as long as it reaches the side, and similarly, the imaging means 21 should be arranged at any position in the vehicle as long as it can image the face of the viewer E. Can be done.

Further, in the above-described embodiment, the reflective layer 12b is formed on the front side (front surface) of the substrate 12a, but as a modification thereof, the reflective layer 12b is formed on the rear side of the substrate 12a as shown in FIG. It may be formed on the (back surface). In this case, the infrared light L1 emitted from the infrared irradiation unit 22 passes through the substrate 12a, and the infrared light L1 transmitted through the substrate 12a is reflected forward by the reflection layer 12b to be the primary reflected infrared light. 12a will be emitted. Similarly, the infrared light L3 after irradiating the viewer E passes through the substrate 12a, and the infrared light L3 transmitted through the substrate 12a is reflected forward by the reflective layer 12b to be the secondary reflected infrared light. The configuration is such that 12a is emitted and the secondary reflected infrared light emitted from the substrate 12a is incident on the imaging means 21.

Further, in the above-described embodiment, the infrared light L1 emitted from the infrared irradiation unit 22 is emitted toward the reflective layer 12b (optical member 12), but the red light emitted from the infrared irradiation unit 22. The external light L1 may be directly (directly) irradiated to the viewer E without passing through the reflective layer 12b (optical member 12).

That is, the infrared irradiation unit 22 here is provided on the steering column S so that the infrared light emitted from the infrared irradiation unit 22 is directly emitted toward the viewer E side, and the optical member 12 is provided. It is arranged on the front side of the display element 11 and has an infrared light reflection function, and the infrared light emitted from the infrared irradiation unit 22 is directly emitted toward the viewer E side to irradiate the viewer E. The later infrared light is reflected by the reflecting layer 12b (optical member 12) so that it can be incident on the imaging means 21. Even in the case of such a configuration, the same effect as that of the above-described embodiment can be obtained.

Further, in the above-described embodiment, the infrared light L3 after irradiating the viewer E (the face of the viewer E) follows the optical path opposite to the optical path of the primary reflected infrared light L2, and reaches the optical member 12. However, the infrared light L3 may be directly (directly) incident on the imaging means 21 without passing through the optical member 12.

That is, the imaging means 21 here is placed on the steering column S so that the portion that receives the infrared light L3 faces the viewer E (that is, the infrared light L3 can be directly incident). The optical member 12 is provided and is arranged on the front side of the display element 11 and has an infrared light reflection function capable of reflecting the infrared light L1 emitted from the infrared irradiation unit 22, and the infrared light L1 is provided. It is configured to be reflected by the reflective layer 12b (optical member 12) and irradiated toward the viewer E side as the primary reflected infrared light L2, so that the infrared light L3 after irradiating the viewer E can be incident on the imaging means 21. Will be done. Even in the case of such a configuration, the same effect as that of the above-described embodiment can be obtained.

10 Display unit 11 Display element (display unit)
12 Optical member 12a Substrate 12b Reflective layer 13 Circuit board 13a Control unit 14 Case member 14a Bottom wall part 14b Side wall part 14c Front side opening 20 Camera module 21 Imaging means 22 Infrared irradiation part 30 Front glass D Instrument panel S Steering column L1 , L3 infrared light L2 primary reflected infrared light L4 secondary reflected infrared light

Claims (6)

A display unit that displays predetermined information and
An optical member arranged on the viewer side of the display unit when viewed from the viewer side who visually recognizes the display unit and having an infrared light reflection function capable of reflecting infrared light emitted from the infrared irradiation unit. With and
The infrared light is reflected by the optical member and irradiated toward the viewer side, and the infrared light after irradiating the viewer is reflected by the optical member so that it can be incident on the imaging means. An in-vehicle display device characterized by being present. A display unit that displays predetermined information and
An optical member arranged on the viewer side of the display unit when viewed from the viewer side who visually recognizes the display unit and having an infrared light reflection function capable of reflecting infrared light emitted from the infrared irradiation unit. With and
The infrared light is reflected by the optical member and irradiated toward the viewer, and the infrared light after irradiating the viewer can be incident on the imaging means. Display device. A display unit that displays predetermined information and
When viewed from the viewer side who visually recognizes the display unit, the display unit is provided with an optical member which is arranged on the viewer side of the display unit and has an infrared light reflection function.
The infrared light emitted from the infrared irradiation unit is irradiated toward the viewer side, and the infrared light after irradiating the viewer is reflected by the optical member so that it can be incident on the imaging means. An in-vehicle display device characterized by this. The vehicle-mounted display device according to any one of claims 1 to 3, wherein the imaging means is provided on a steering column of a vehicle. A case member for accommodating the display unit is provided.
The vehicle-mounted display device according to any one of claims 1 to 4, wherein the optical member is a hot mirror provided so as to form a pair with the case member. The vehicle-mounted display device according to any one of claims 1 to 5, wherein the display unit is an organic EL panel.

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