CN-116009227-B - Blind spot display device

CN116009227BCN 116009227 BCN116009227 BCN 116009227BCN-116009227-B

Abstract

The blind spot display device displays an image of a blind spot blocked by an obstacle (92), and includes an incident surface (2 a), a light guide member (2 e), a first reflection surface (3) near a display area, a second reflection surface (2 c) near the blind spot, and a plurality of prism portions (4) protruding toward the display area. An external ambient light beam enters the incident surface, is alternately reflected on the first and second reflection surfaces while passing through the light guide member, and is emitted toward the display area through the prism portion. The apexes of the prism portions are arranged in three dimensions rather than along a plane.

Inventors

ISHIHARA KAZUYUKI
An Tenghao

Assignees

株式会社电装
丰田自动车株式会社
未来瞻科技株式会社

Dates

Publication Date: 20260512
Application Date: 20221020
Priority Date: 20211022

Claims (10)

1. A blind spot display device that displays an image of a blind spot blocked by an obstacle, the blind spot display device comprising: An incident face through which an external ambient light beam enters, the external ambient light beam being transmitted from the blind spot; A light guide member that guides the external ambient light beam entering through the incident surface; A first reflecting surface disposed opposite to the blind spot with respect to the light guide member, on which the external ambient light beam guided by the light guide member is reflected; a second reflecting surface disposed near the blind spot with respect to the light guiding member, the second reflecting surface being opposite to the first reflecting surface, the external ambient light beam guided by the light guiding member being reflected on the second reflecting surface, and A plurality of prism portions disposed opposite to the blind spot with respect to the light guide member and protruding toward a display area defined as an area opposite to the blind spot with respect to the light guide member, the external ambient light beam being emitted toward the display area through the plurality of prism portions after traveling through the light guide member, Wherein the method comprises the steps of The external ambient light beam enters the light guide member through the incident surface, and then is alternately reflected on the first reflecting surface and the second reflecting surface while traveling in an arrangement direction in which the plurality of prism portions are away from the incident surface, A portion of the external ambient light beam is emitted toward the display area through the plurality of prism portions, and The apexes of the plurality of prism portions are arranged in a three-dimensional manner rather than along a plane.
2. The blind spot display device of claim 1 wherein The first reflecting surface includes a plurality of sub-surfaces separated from each other, and the plurality of sub-surfaces are alternately arranged with the plurality of prism portions, Each of the plurality of prism portions protrudes more toward the display area than adjacent two of the plurality of sub-surfaces, and The first reflective surface is arranged in three dimensions rather than along a plane.
3. The blind spot display device of claim 2, wherein The plurality of prism portions and the first reflecting surface have a stepped shape as a whole, and the stepped shape includes a plurality of first steps, The plurality of first steps includes a specific first step and a subsequent first step disposed adjacent to the specific first step in a direction away from the incident surface, The latter first step protrudes more toward the display area than the specific first step, The specific first step is connected with the subsequent first step through an inclined plane, One of the external ambient light beams passes through one of the prism portions included in the specific first step and arranged closest to the latter first step toward the display area, and The bevel is arranged such that said one of the external ambient light beams is not blocked by the bevel.
4. A blind spot display device according to claim 3, wherein The plurality of prism portions includes a specific prism portion arranged on the specific first step, and the specific prism portion has a surface arranged near the incident surface, and The inclined surface connecting the specific first step and the subsequent first step is parallel to the surface of the specific prism portion disposed near the incident surface.
5. The blind spot display device of claim 2, wherein The plurality of prism portions and the first reflecting surface have a stepped shape as a whole, and the stepped shape includes a plurality of first steps, The plurality of first steps includes a specific first step and a subsequent first step disposed adjacent to the specific first step in a direction away from the incident surface, The latter first step protrudes more toward the display area than the specific first step, The specific first step is connected with the subsequent first step through an inclined plane, The plurality of prism portions includes a specific prism portion arranged on the specific first step, One of the external ambient light beams passes through the specific prism portion toward the display area and then enters the inclined plane, and The inclined planes are inclined such that an incident angle of the one of the external environment light beams with respect to the inclined planes is equal to an incident angle (θ1+ψ) of the one of the external environment light beams with respect to the incident plane.
6. The blind spot display device according to claim 5, wherein The inclined plane is parallel to the incident plane.
7. The blind spot display device of claim 2, wherein The plurality of prism portions and the first reflecting surface have a stepped shape as a whole, and the stepped shape includes a plurality of first steps, The plurality of first steps includes a specific first step and a previous first step disposed adjacent to the specific first step in a direction toward the incident surface, The previous first step protrudes more toward the display area than the specific first step, The external ambient light beam enters the incident surface parallel to a cross section of the blind spot display device, the cross section of the blind spot display device including the incident surface, the light guide member, the first reflecting surface, the second reflecting surface and the plurality of prism portions, A distance (h) defined in a protruding direction between a portion of the first reflecting surface disposed in the preceding first step and closest to the specific first step and another portion of the first reflecting surface disposed in the specific first step and closest to the preceding first step satisfies the following relational expression, The protruding direction is defined as a direction in which the specific first step or the previous first step protrudes toward the display area, The inclination angle (ψ) of the inclined surface connecting the specific first step and the preceding first step with respect to the protruding direction is an acute angle, and satisfies the following relational expression, When the external ambient light beam is reflected on the first reflecting surface after passing through the light guide member, a light guide angle (Φ) of the external ambient light beam with respect to the protruding direction is defined, and the light guide angle satisfies the following relational expression, One of the plurality of prism portions included in the previous first step is disposed closest to the specific first step, and a width (Wse) of the one of the plurality of prism portions is defined in a direction perpendicular to the protruding direction, and the width (Wse) satisfies the following relational expression, The relational expression is h≤ Wse/{ tan. Phi. X (1-tan. Phi. Times tan. Phi.) }.
8. The blind spot display device according to any one of claims 2-7, wherein The second reflecting surface has a step shape, and the step shape includes a plurality of second steps, and The second reflective surface is disposed in three dimensions rather than along a plane.
9. The blind spot display device according to any one of claims 3-7, wherein The second reflecting surface has a step shape and the step shape comprises a plurality of second steps (31, 32,33, 34), The second reflective surface is arranged in three dimensions rather than along a plane, The blind spot display device further includes a plurality of connection surfaces, each of the connection surfaces connecting adjacent two of the plurality of second steps, and The plurality of connection faces are arranged farther than an inclined face connecting one of the plurality of first steps closest to the incident face and the other of the plurality of first steps second closest to the incident face in a direction away from the incident face.
10. The blind spot display device according to any one of claims 3-7, wherein The second reflecting surface has a step shape and the step shape comprises a plurality of second steps (31, 32,33, 34), The second reflective surface is arranged in three dimensions rather than along a plane, A portion of the plurality of first steps is arranged such that one of the plurality of first steps that is farther from the incident surface protrudes toward the display area than an adjacent one of the plurality of first steps that is closer to the incident surface, The portions of the plurality of first steps are divided into one or more first step pairs, each first step pair comprising two adjacent ones of the plurality of first steps, A portion of the plurality of second steps is arranged such that one of the plurality of second steps that is farther from the incident surface is disposed closer to the display area than an adjacent one of the plurality of second steps that is closer to the incident surface, The portions of the plurality of second steps are divided into one or more second step pairs, each second step pair including adjacent two of the plurality of second steps, and The number of the one or more first step pairs is equal to the number of the one or more second step pairs.

Description

Blind spot display device Technical Field The present disclosure relates to a blind spot display device. Background Conventionally, a blind spot display device described in JP 2015-143087A displays an image of a blind spot area blocked by an obstacle. The blind spot display device includes a translucent flat mirror and a flat mirror attached to the obstacle and facing each other. The blind spot display device further includes a translucent member disposed between the translucent flat mirror and the flat mirror, and a plurality of prisms disposed between the translucent flat mirror and the viewer. Light from the blind spot region enters and travels along the translucent member while repeating reflection between the translucent mirror and the plane mirror. Of the light entering the translucent member, part of the light travels in a display direction from which a viewer views after being transmitted through the plurality of prisms. With this configuration, the viewer can visually recognize the image of the blind spot region. The apexes of the plurality of prisms on the observer side are disposed on the same plane. Disclosure of Invention The present disclosure provides a blind spot display device that displays an image of a blind spot blocked by an obstacle. The blind spot display device includes an incident surface, a light guide member, a first reflecting surface near a display area, a second reflecting surface near a blind spot, and a plurality of prism portions protruding toward the display area. An external ambient light beam enters the incident surface, is alternately reflected on the first and second reflection surfaces while passing through the light guide member, and is emitted toward the display area through each prism portion. The apexes of the prism portions are arranged in three dimensions rather than along a plane. Drawings The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. In the drawings: fig. 1 is a view showing a view in a direction toward a front pillar of a vehicle with a driver seat as an eyepoint according to a first embodiment; FIG. 2 is a cross-sectional view of a blind spot display device; FIG. 3 is a diagram illustrating the path of an external ambient light beam in the cross-section shown in FIG. 2; FIG. 4 is an enlarged view of the exit face on the cross-section shown in FIG. 2; FIG. 5 is an enlarged view of the external ambient beam path in the cross-section shown in FIG. 2; FIG. 6 is an enlarged view of the angled portion of the exit face and the periphery of the exit face in the cross-section shown in FIG. 2; FIG. 7 is a diagram showing a cross section of a blind spot display device and an external ambient light beam path according to a second embodiment; fig. 8 is a diagram showing a comparison of the first embodiment and the second embodiment; FIG. 9 is a cross-sectional view of a blind spot display device according to a third embodiment, on the same cross-section as shown in FIG. 2; FIG. 10 is a diagram illustrating the external ambient beam path on the cross-section shown in FIG. 9; Fig. 11 is an explanatory diagram for explaining a relationship between an angle of the inclined surface and a gap between light beams; fig. 12 is a view showing suppression of a gap between light beams by adjusting the angle of the inclined surface; FIG. 13 is a cross-sectional view of a blind spot display device according to a fourth embodiment, on the same cross-section as shown in FIG. 9; fig. 14 is an explanatory diagram for explaining a relationship between the width of the incident surface and the gap between the light beams; Fig. 15 is an explanatory diagram for explaining a relationship between the width of the incident surface and the gap between the light beams; FIG. 16 is an explanatory view for explaining a relation between a width of an incident surface and a gap between light beams, and Fig. 17 is a view showing the driver seat as an eyepoint in a direction toward the front pillar of the vehicle. Detailed Description According to the studies of the inventors of the present disclosure, in some cases, a blind spot display device viewed by a viewer is attached to a curved surface of an obstacle. When the blind spot display device disclosed in JP 2015-143087A is attached to a curved surface, the shape of the display surface of the blind spot display device viewed from the user's viewpoint is greatly different from the shape of an obstacle viewed from the user's viewpoint. Such a difference in appearance shape between the display device and the obstacle may reduce the design feel of the display device. It is an object of the present disclosure to provide a blind spot display device in which the display surface is configured to have an appearance of a curved shape when viewed from a viewpoint. According to one aspect of the present disclosure, a blind