JP2018205446A - Display system, electronic mirror system and mobile body equipped with the same - Google Patents

Abstract

To provide a display system capable of reducing external light such as sunlight incident on a display, and an electronic mirror system and a mobile body.SOLUTION: A display system 10 comprises: a display part 20 configured to display images on the basis of picked-up images; a magnifying optical system 30 configured to output an enlarged image which is displayed on the display 20; and a polarization filter 70 (optical attenuation part) for attenuating an external light incident on the display 20 via the magnifying optical system 30.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a display system, an electronic mirror system, and a moving body including the same, and more particularly to a display system that displays an image based on a captured image, an electronic mirror system, and a moving body including the same.

  Conventionally, there has been a vehicle display device (display system, electronic mirror system) including a rear camera, a monitor, and a concave mirror (see, for example, Patent Document 1). The rear camera images the back of the vehicle. The monitor is provided at a ceiling position between the driver seat and the passenger seat in the passenger compartment, and displays a vehicle rear image based on vehicle rear image data from the rear camera. The concave mirror is installed at an upper position of the front window in the passenger compartment, and reflects the monitor image to show the vehicle rear image to the vehicle occupant.

JP 2009-12080 A

  In the vehicle display device described in Patent Document 1, when sunlight incident from the outside of the passenger compartment hits the concave mirror, the concave mirror may cause the sunlight to be collected on the monitor, and the monitor becomes locally hot. The monitor could be damaged.

  The objective of this indication is providing the display system which can reduce external lights, such as sunlight which injects into a display part, an electronic mirror system, and a moving body provided with the same.

  A display system according to an aspect of the present disclosure includes a display unit that displays an image based on a captured image, a magnifying optical system that magnifies and outputs the image displayed on the display unit, and the optic through the magnifying optical system. A light attenuating unit for attenuating external light incident on the display unit.

  An electronic mirror system according to an aspect of the present disclosure includes the display system and an imaging unit that outputs the captured image.

  A moving body according to an aspect of the present disclosure includes the electronic mirror system and a moving body main body on which the electronic mirror system is mounted.

  According to the present disclosure, it is possible to provide a display system, an electronic mirror system, and a moving body including the display system that can reduce external light such as sunlight incident on the display unit.

FIG. 1 is a schematic explanatory diagram of a moving object including a display system according to an embodiment of the present disclosure. FIG. 2 is a schematic explanatory diagram of the above display system. FIG. 3 is an explanatory diagram of a display position of an image displayed by the above display system. FIG. 4 is a schematic explanatory diagram of the above display system. FIG. 5 is an explanatory diagram showing an example of an image displayed by the above display system. 6A and 6B are explanatory diagrams for explaining the range of an image that can be seen by the user's right eye in the above-described display system. FIG. 7 is an explanatory diagram for explaining a range of an image visible to the user's eyes in the above display system. FIG. 8 is a schematic explanatory diagram of a display system according to Modification 1 of the embodiment of the present disclosure. FIG. 9 is a schematic explanatory diagram of a display system according to Modification 2 of the embodiment of the present disclosure. FIG. 10 is a schematic explanatory diagram of a display system according to another modification of the embodiment of the present disclosure. FIG. 11 is a side view of a biconvex lens included in a display system according to another modification of the embodiment of the present disclosure. FIG. 12 is a top view of a moving object according to an embodiment of the present disclosure.

  1 to 12 described in the following embodiments and the like are conceptual diagrams, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect actual dimensional ratios. .

(Embodiment)
(1) Outline As shown in FIGS. 1 and 2, the display system 10 according to the present embodiment is used in, for example, an automobile 100 as a moving body.

  As shown in FIG. 2, the display system 10 includes a display unit 20, a magnifying optical system 30, and a light attenuating unit (concave mirror 31, beam splitter 43, polarization filter 70). The display unit 20 displays an image based on the captured image. The magnifying optical system 30 magnifies and outputs the image displayed on the display unit 20. The light attenuating unit attenuates external light incident on the display unit 20 via the magnifying optical system 30.

  According to the display system 10 of the present embodiment, when an image is displayed on the display unit 20, the image displayed on the display unit 20 is enlarged by the magnifying optical system 30, and the image enlarged by the magnifying optical system 30 is displayed by the user. 200 (an occupant such as a driver of the automobile 100).

  Here, when external light (for example, sunlight) incident from the outside of the display system 10 is incident on the display unit 20 via the magnifying optical system 30, the external light is condensed on the display unit 20 by the magnifying optical system 30. Therefore, the temperature of the display unit 20 may be locally increased. In the present embodiment, since the light attenuating unit attenuates the external light incident on the display unit 20 via the magnifying optical system 30, the external light condensed on the surface of the display unit 20 by the magnifying optical system 30 can be reduced. Therefore, according to the display system 10 of the present embodiment, damage applied to the surface of the display unit 20 can be reduced even when sunlight from the sun 400 is incident.

  In the present embodiment, the image displayed on the display unit 20 is an image based on a captured image captured by the imaging unit 90 attached to the automobile 100. Here, the image based on the captured image may be the captured image itself, an image obtained by performing image processing on the captured image, or a CG (Computer Graphics) image created based on the captured image. For example, since the image captured by the imaging unit 90 becomes dark at night, the brightness of the image captured by the imaging unit 90 may be corrected. Further, a CG (Computer Graphics) image or a marker or the like indicating an obstacle or the like reflected in the image is created based on the image captured by the imaging unit 90, and the CG image or marker is displayed on the captured image of the imaging unit 90. An image in which the above is superimposed may be displayed on the display unit 20. In addition, an image in which driving support information (for example, vehicle speed information, navigation information, pedestrian information, forward vehicle information, lane departure information, vehicle condition information, etc.) is superimposed on the image captured by the imaging unit 90 is displayed. It may be displayed on the unit 20.

(2) Details Hereinafter, the display system 10 according to the present embodiment will be described in detail with reference to the drawings.

(2.1)
As shown in FIGS. 2 and 3, the display system 10 of the present embodiment includes a display unit 20, a magnifying optical system 30, and a light attenuating unit (concave mirror 31, beam splitter 43, polarizing filter 70). . The display system 10 of the present embodiment further includes a housing 40, a display control unit 50, and a background object 71. The display system 10 and the imaging unit 90 constitute an electronic mirror system 80, and the electronic mirror system 80 is mounted on a main body (moving body main body) 110 of the automobile 100 that is a moving body.

  The housing 40 is made of, for example, a synthetic resin molded product or the like, and includes a storage chamber 41 therein. In the storage chamber 41 of the housing 40, the display unit 20, the magnifying optical system 30, and the display control unit 50 are stored.

  The housing 40 is a front side portion near the windshield 102 (windshield) in the ceiling portion 101 of the main body 110, and is in a position where the user 200 seated on the front seat 103 enters the field of view of the user 200 while facing the front. It is attached (see FIG. 1).

  The housing 40 is attached to the ceiling portion 101 in a state of being suspended from the ceiling portion 101 of the main body 110 via the ball joint 60 (see FIG. 3), and is disposed at a position that does not interfere with the front view of the user 200. Yes.

  An opening 42 that is continuous with the storage chamber 41 is provided on the rear surface of the housing 40 (the rear wall of the housing 40). The opening 42 has a larger dimension in the left-right direction (the direction perpendicular to the up-down direction and the front-rear direction) than the dimension in the up-down direction, and the vertical dimension (long side dimension) and the left-right dimension (short side dimension) The ratio is about 3-6: 1.

  The display unit 20 is stored in the upper part of the storage chamber 41 with the display surface facing the front side. As shown in FIG. 4, the display unit 20 includes a light source device 21, a liquid crystal substrate 22, a first polarizing member 231, and a second polarizing member 232. The light source device 21 is used as a backlight. The light source device 21 is a so-called surface light source. The light source device 21 is a sidelight type light source device using a solid light emitting element such as a light emitting diode or a laser diode. The liquid crystal substrate 22 includes, for example, two rectangular glass substrates and a liquid crystal layer sandwiched between the two glass substrates. The first polarizing member 231 and the second polarizing member 232 are each formed in a flat plate shape having the same size as the liquid crystal substrate 22. The first polarizing member 231 is disposed between the light source device 21 and the liquid crystal substrate 22. The second polarizing member 232 is disposed on the opposite side of the liquid crystal substrate 22 from the first polarizing member 231. Each of the first polarizing member 231 and the second polarizing member 232 has a function of transmitting only polarized light in a specific direction (direction along the polarization axis). The polarization axis of the first polarizing member 231 and the second polarizing member The polarization axes of 232 are orthogonal to each other. When a voltage is applied to the liquid crystal layer through the electrode of the display unit 20, the transmittance of light transmitted through the first polarizing member 231 and the second polarizing member 232 changes and is output from the display surface of the display unit 20. An image is formed by light.

  The display control unit 50 controls the voltage applied to the liquid crystal layer via the electrodes of the liquid crystal substrate 22 to control the display state of the image on the display unit 20. The display control unit 50 communicates (wired communication or wireless communication) with the imaging unit 90 via the in-vehicle network of the automobile 100. Image data of a captured image behind the automobile 100 is input from the imaging unit 90 to the display control unit 50. The display control unit 50 displays an image based on the captured image input from the imaging unit 90 on the display unit 20. For example, the display control unit 50 displays the image captured by the imaging unit 90 on the display unit 20 as it is.

  The display control unit 50 is configured by, for example, a computer system having a processor and memory as hardware. In other words, the display control unit 50 is realized by a computer system having a processor and a memory, and the computer system functions as the display control unit 50 when the processor executes a program stored in the memory. The program may be recorded in advance in the memory of the computer system, but may be provided through an electric communication line, or may be recorded in a recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. May be provided. A processor of a computer system includes one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The plurality of electronic circuits may be integrated on one chip, or may be distributed on the plurality of chips. The plurality of chips may be integrated into one device, or may be distributed and provided in a plurality of devices.

  The imaging unit 90 is, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor attached to the rear part of the automobile 100 and images the rear of the automobile 100. The imaging unit 90 is not limited to a CMOS image sensor, but may be a CCD (Charge Coupled Device) image sensor or the like.

  The imaging unit 90 outputs image data obtained by imaging the rear of the automobile 100 to the display control unit 50 via, for example, an in-vehicle network. Since the imaging unit 90 is disposed at the center in the left-right direction at the rear part of the automobile 100, the imaging unit 90 captures an area that can be viewed with a conventional room mirror, and the electronic mirror system 80 is used as a rear confirmation mirror such as a conventional room mirror. Used. Note that the imaging unit 90 may image the rear side of the automobile 100. The imaging unit 90 may image a range that can be visually recognized by a conventional door mirror or fender mirror, and the electronic mirror system 80 may be used as a rear confirmation mirror instead of the conventional door mirror or fender mirror. The imaging unit 90 is attached to the rear portion of the main body 110 and at an upper position of the main body 110, but the mounting position of the imaging unit 90 is an example, and the imaging unit 90 is attached to a position where a desired range can be imaged. Just do it.

  The magnifying optical system 30 includes a concave mirror 31. The concave mirror 31 reflects light output from the display unit 20 (that is, light forming an image displayed on the display unit 20) toward the opening 42. The concave mirror 31 is formed by evaporating a reflective metal film such as aluminum on the surface of glass, for example. Here, it is preferable that the reflective metal film is formed on the concave surface of the concave mirror 31, and there is an advantage that the image is less likely to be doubled compared to the case where the reflective metal film is formed on the surface opposite to the concave surface. In the present embodiment, the display unit 20 is arranged at a position far from the concave mirror 31 with respect to the focal position of the concave mirror 31.

  The magnifying optical system 30 of the present embodiment reflects an image displayed on the display unit 20, that is, light output from the display unit 20 (light forming an image), and outputs the reflected light to the outside of the housing 40 through the opening 42. ing. Therefore, the user 200 (an occupant such as a driver of the automobile 100) can visually recognize the image (reflected image) reflected by the magnifying optical system 30 through the opening 42. Since the image reflected by the magnifying optical system 30 is an image obtained by enlarging the image displayed on the display unit 20, the user 200 can view the image displayed on the display unit 20 in a large size.

  Thus, since the user 200 is viewing the image reflected by the concave mirror 31 of the magnifying optical system 30, the user 200 is farther from the magnifying optical system 30 in the direction in which the magnifying optical system 30 can be seen from the user 200 (several meters of the automobile 100). It looks as if the image of the display unit 20 is displayed at a virtual display position forward (for example, 2 to 3 meters ahead) (see FIG. 3). That is, it appears to the user 200 that a virtual image 300 that is an image of the display unit 20 is displayed at a virtual display position several meters ahead of the automobile 100.

  Here, “the output” of the image reflected by the magnifying optical system 30 to the outside of the housing 40 through the opening 42 means that the light forming the image is emitted to the outside of the housing 40 through the opening 42. Say. As a result, the user 200 can view the image reflected by the magnifying optical system 30 through the opening 42. The distance to the virtual image 300 recognized by the user 200 when the user 200 views the virtual image 300 is referred to as “viewing distance”. Further, the “display position” of the virtual image 300 refers to the virtual image 300 from the user 200 in the output direction (a direction parallel to the arrow D1 in FIG. 3) in which the image reflected by the magnifying optical system 30 is output to the outside of the housing 40. Is a virtual position (see FIG. 3) that is recognized as if the virtual image 300 is displayed. 2, 3, 4, and 8 to 10, a traveling path of light output from one point (although a prime point) of an image displayed on the display surface of the display unit 20 is schematically illustrated by a one-dot chain line.

  Here, when the display part 20 is arrange | positioned at the surface of the housing 40, the display part 20 exists in front of a user several tens of centimeters. When the user 200 is driving the automobile 100, the user 200 is looking forward several tens of meters. Therefore, when viewing the road conditions ahead of several tens of meters and the image of the display unit 20 ahead of several tens of centimeters. The amount of focus adjustment for the eye increases when viewing. On the other hand, in this embodiment, the virtual image 300 that is the image of the display unit 20 is displayed at a position several meters ahead of the automobile 100, and when viewing the road situation several tens of meters forward and when viewing the virtual image 300. Since the adjustment amount of the eye focus becomes small, the adjustment time of the eye focus becomes short. Further, for an elderly person or a farsighted user 200 who has difficulty focusing his eyes on a short distance, the virtual image 300 displayed several meters ahead of the automobile 100 is more preferable than the display unit 20 disposed several tens of centimeters ahead. There is an advantage that it is easy to see.

  Here, the distance (viewing distance) to the display position of the virtual image 300 output by the magnifying optical system 30 is determined by the optical path length between the display unit 20 and the eyes of the user 200. Thus, the volume of the housing 40 (the storage chamber 41) is maintained while the distance (viewing distance) to the display position of the virtual image 300 is kept at a desired distance by reflecting the light output from the display unit 20 by the magnifying optical system 30. The housing 40 can be reduced in size.

  When external light such as sunlight enters the magnifying optical system 30 from the outside of the housing 40, the external light is reflected by the concave mirror 31 of the magnifying optical system 30 and enters the display unit 20. Here, the reflectivity of the concave mirror 31 is, for example, 30 to 60%, and a part of the light incident on the concave mirror 31 is transmitted through the concave mirror 31, so that it is reflected by the concave mirror 31 compared to the light incident on the concave mirror 31. Light incident on the display unit 20 is attenuated. The lower the reflectivity of the concave mirror 31, the higher the effect of attenuating external light. However, if the reflectivity is lowered, it is necessary to increase the luminance of the display unit 20. Therefore, in this embodiment, the reflectivity is set to 30%, for example. . Therefore, since the external light incident on the display unit 20 from the outside of the housing via the magnifying optical system 30 is also reduced by the concave mirror 31, the external light incident on the display unit 20 via the magnifying optical system 30 is reduced. Can suppress the temperature rise.

  The opening 42 of the housing 40 is covered with, for example, a beam splitter 43. Since the opening 42 of the housing 40 is covered with the beam splitter 43, it is difficult for dust and the like to enter the storage chamber 41 from the outside of the housing 40, and dust is incident on the concave mirror 31 of the magnifying optical system 30 stored in the storage chamber 41. Etc. become difficult to adhere.

  The beam splitter 43 has a function of transmitting part of incident light and reflecting another part of incident light. The beam splitter 43 transmits the light reflected by the magnifying optical system 30 and outputs the light to the outside of the housing 40. The beam splitter 43 transmits a part of the external light (for example, sunlight) incident from the outside of the housing 40 and reflects the other part of the incident external light. External light incident on the inside is reduced. Accordingly, since the outside light incident on the display unit 20 from the outside of the housing 40 via the magnifying optical system 30 is reduced also by the beam splitter 43, the display is performed with the outside light incident on the display unit 20 via the magnifying optical system 30. The temperature rise which generate | occur | produces in the part 20 can be suppressed.

  In the present embodiment, the beam splitter 43 is, for example, a half mirror whose light transmittance and reflectance are about 50%. The beam splitter 43 has an outer surface 431 with respect to an output direction (a direction parallel to the arrow D1 in FIG. 3) in which an image reflected by the magnifying optical system 30 (light forming the image) is output to the outside of the housing 40. Are arranged to cross diagonally. Here, the outer surface 431 of the beam splitter 43 is a surface exposed to the outside of the housing 40 among both side surfaces of the beam splitter 43 in a direction in which light passes through the beam splitter 43 from the inside of the housing 40. Thereby, the light reflected on the outer surface 431 of the beam splitter 43 and entering the eyes of the user 200 is reduced, so that the reflection of the light on the outer surface 431 is reduced, and the image of the display unit 20 that can be seen through the beam splitter 43. The contrast can be increased.

  The polarizing filter 70 has a function of transmitting only polarized light in a specific direction. The polarizing filter 70 has the same vertical and horizontal dimensions as the beam splitter 43, and is arranged in a state of being superimposed on the inner surface of the beam splitter 43 (the surface on the storage chamber 41 side). The polarizing filter 70 is fixed to the inner surface of the beam splitter 43 by a method such as adhesion. When external light such as sunlight enters the polarizing filter 70 via the beam splitter 43, only polarized light in the direction along the polarization axis of the polarizing filter 70 out of the external light passes through the polarizing filter 70. Compared with the incident external light, the external light passing through the polarizing filter 70 is reduced. Therefore, since the external light incident on the display unit 20 from the outside of the housing 40 via the magnifying optical system 30 is reduced by the polarizing filter 70, the display unit is exposed to the external light incident on the display unit 20 via the magnifying optical system 30. The temperature rise generated at 20 can be suppressed.

  By the way, the display unit 20 includes a second polarizing member 232, and the polarization axis of the second polarizing member 232 and the polarization in a plane orthogonal to the optical path of the light output from the display unit 20 (that is, the second polarizing member 232). The second polarizing member 232 and the polarizing filter 70 are arranged in a positional relationship such that the polarization axis of the filter 70 coincides. In the present embodiment, since the concave mirror 32 is disposed between the display unit 20 and the polarizing filter 70, the polarization axis of the second polarizing member 232 and the polarization axis of the polarizing filter 70 are not parallel to each other. By being arranged in such a positional relationship, the light that has passed through the second polarizing member 232 is configured to pass through the polarizing filter 70.

  The housing 40 is suspended from the ceiling portion 101 of the automobile 100 via the ball joint 60 (see FIG. 3). The ball joint 60 includes a ball stud 61 and a socket 62. The ball stud 61 includes a round bar portion having one end (upper end) fixed to the ceiling portion 101 and a spherical portion provided at the other end (lower end) of the round bar portion. The socket 62 is fixed to the upper portion of the housing 40, and the socket 62 is provided with a groove into which the spherical portion of the ball stud 61 is fitted. In the ball joint 60, the spherical portion of the ball stud 61 is in spherical contact with the groove of the socket 62, and the housing 40 integrated with the socket 62 can be moved to an arbitrary position within the movable range of the ball stud 61. Therefore, the user 200 can move the housing 40 to an arbitrary position within the movable range of the ball joint 60, and can adjust the orientation of the housing 40 to a desired orientation.

  In the storage chamber 41 of the housing 40, a background object 71 is disposed at a position facing the surface (back surface) opposite to the reflecting surface 311 of the concave mirror 31 (see FIG. 2). The background object 71 has a flat plate shape, and the vertical dimension and the horizontal dimension of the background object 71 are substantially the same as the vertical dimension and the horizontal dimension of the concave mirror 31. The background object 71 has a function of absorbing incident light. The color of the background object 71 is darker than the inner surface of the storage chamber 41, for example, black. Thereby, since the light which injects into the back surface of the concave mirror 31 from the area | region where the background object 71 is arrange | positioned is reduced, the light which permeate | transmits the concave mirror 31 from the back surface of the concave mirror 31 reduces. Therefore, there is an advantage that the contrast of the image reflected by the concave mirror 31 is high, and the user can easily see the image (virtual image 300) reflected by the concave mirror 31.

(2.2) Operation The operation of the electronic mirror system 80 of this embodiment will be described.

  For example, when electric power is supplied from the battery of the automobile 100 to the electronic mirror system 80 and a control signal for starting the operation is input to the electronic mirror system 80 from an ECU (Electronic Control Unit), the electronic mirror system 80 starts operating. .

  For example, when a control signal is input from the ECU of the automobile 100 to the display control unit 50, the display control unit 50 causes the imaging unit 90 to capture the rear of the automobile 100 at a predetermined frame rate, and the imaging unit 90 captures the captured image. Get image data.

  When the image data of the captured image is input from the imaging unit 90, the display control unit 50 creates an image based on the captured image and causes the display unit 20 to display the image.

  The image displayed on the display unit 20 is reflected by the magnifying optical system 30, and the image reflected by the magnifying optical system 30 passes through the polarizing filter 70 and the beam splitter 43 and is output to the outside of the housing 40. Thereby, the user 200 can visually recognize the image reflected by the magnifying optical system 30 through the beam splitter 43. FIG. 5 shows an example of an image displayed on the electronic mirror system 80. On the outer surface 431 of the beam splitter 43, an image (virtual image 300) based on a captured image behind the automobile 100 by light transmitted through the beam splitter 43 is displayed. It is displayed. Since the display system 10 outputs the image reflected by the magnifying optical system 30, the user 200 recognizes that the image (virtual image 300) is displayed, for example, several meters ahead of the automobile 100. Therefore, when the user 200 is viewing the front of the automobile 100 through the windshield 102, the amount of focus adjustment when viewing the virtual image 300 is arranged so that the display unit 20 is several tens of centimeters ahead of the user 200. Less than the case. Therefore, the adjustment time required for the user 200 to adjust the focus on the virtual image 300 can be shortened. In addition, even when the user 200 is difficult to focus on a relatively short distance due to age, farsightedness, etc., the focus adjustment becomes easy.

  Further, in the display system 10 of the present embodiment, the magnifying optical system 30 includes a concave mirror 31, and the concave mirror 31 reflects a part of the image displayed on the display unit 20. Therefore, as shown in FIG. 6A, the virtual image 300 formed by the light reflected by the magnifying optical system 30 is enlarged when the magnifying optical system 30 reflects the entire image displayed on the display unit 20. It becomes a part of the virtual image 310 formed by the light reflected at 30. Here, in the state where the user 200 as the driver is seated at a fixed position, the actually visible virtual image 300 is located at the center of the entire virtual image 310 in each of the vertical direction and the horizontal direction (FIG. 6A, 7). FIG. 6A shows a range of the virtual image 300 that can be seen by the right eye 201 of the user 200 among the virtual images 310 formed when the entire image of the display unit 20 is reflected by the magnifying optical system 30. The straight line L1 in FIG. 6A is a straight line parallel to the front-rear direction passing through the intermediate position between the right eye 201 and the left eye 202. Since the center of the right eye 201 and the left eye 202 includes a midpoint and is symmetric with respect to a plane parallel to the straight line L1, the range of the virtual image seen by the left eye 202 is the range of the virtual image 300 seen by the right eye 201. And is symmetric with respect to a plane parallel to the straight line L1.

  On the other hand, when the head position of the user 200 moves to the right side (upper side in FIG. 6B) compared to the position shown in FIG. 6A, the range of the virtual image 300 that can be seen by the left and right eyes of the user 200 is on the left side (lower side in FIG. 6B). Moving. FIG. 6B shows the range of the virtual image 300 that can be seen by the right eye 201 of the user 200 when the right eye 201 of the user 200 is present at the position P1, and the left end of the virtual image 300 that can be seen by the right eye 201 of the user 200 is the left end of the virtual image 310. Match.

  Contrary to the above, when the position of the head of the user 200 moves to the left side, the range of the virtual image that can be seen by the left and right eyes moves to the right side (upper side in FIG. 6B) according to the movement of the head. When the left eye 202 of the user 200 moves to a position P2 (a position symmetrical to the position P1 with respect to the straight line L1), the right end of the virtual image 300 that can be seen by the left eye 202 of the user 200 is a virtual image 310 formed by the entire image of the display unit 20. Matches the right edge of.

  Therefore, the position of the head when the right eye 201 of the user 200 is at the position P1 (hereinafter referred to as the first position) and the position of the head when the left eye 202 of the user 200 is at the position P2 (hereinafter referred to as the second position). .)), The range of virtual images that can be seen by the right eye 201 and the left eye 202 changes as the head of the user 200 moves. When the display unit 20 is arranged on the surface of the housing 40, the image displayed on the display unit 20 is the same even if the position of the head of the user 200 is moved. When moving between the first position and the second position, the range of the virtual image 300 that can be seen by the right eye 201 and the left eye 202 changes, so that it can be used like a mirror. If the head position moves between the first position and the second position, the left and right eyes of the user 200 do not see the edge of the display unit 20 and do not feel uncomfortable. In other words, if the left and right eyes of the user 200 are within the range of the predetermined eye box, the left and right eyes of the user 200 do not see the edge of the display unit 20 and do not feel uncomfortable.

  Even when the user's 200 head moves in the vertical direction, the range of the virtual image 300 visible to the left and right moves in the vertical direction as the head moves, as in the horizontal direction. That is, if the user's 200 head moves upward, the range of the virtual image 300 visible to the left and right moves downward, and if the user's 200 head moves downward, the range of the virtual image 300 visible to the left and right. Moves upward.

  In the display system 10 of the present embodiment, the resolution of the display unit 20 is set to a value higher than the limit resolution at the display position of the virtual image 300. The limit resolution is a limit value of resolution that can be identified by the human eye, and can be obtained based on, for example, the gap of the Landolt ring used for visual acuity examination. The limit resolution is lower as the viewing distance is longer, and is higher as the visual acuity is better.

  Therefore, when the display position of the virtual image 300 (that is, the viewing distance to the virtual image 300) and the visual acuity assumed by the user 200 are determined, the limit resolution at the display position of the virtual image 300 is obtained using a predetermined calculation formula. Since the magnifying optical system 30 of the present embodiment displays an enlarged image of the display unit 20, if the limit resolution at the display position of the virtual image 300 is determined, the resolution of the display unit 20 is determined according to the limit resolution. The In the present embodiment, the resolution of the display unit 20 is set to a value higher than the limit resolution at the display position of the virtual image 300. As a result, the virtual image 300 is displayed at a resolution higher than the limit resolution at a predetermined display position, and the user 200 viewing the virtual image 300 feels the depth and stereoscopic effect of the virtual image 300 as if looking at an actual mirror. I can feel it. In particular, since the high-definition image moves with the movement of the automobile 100 while the automobile 100 is traveling, the user 200 can feel a more stereoscopic effect.

(3) Modifications The above embodiment is only one of various embodiments of the present disclosure. The above embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.

  Hereinafter, modifications of the embodiment will be listed. The modifications described below can be applied in appropriate combinations.

(3.1) Modification 1
In the display system 10 of the above embodiment, the background object 71 is arranged at a position facing the back surface of the concave mirror 31 inside the storage chamber 41. However, in the display system 10A of the first modification, as shown in FIG. A background object 72 is attached to the back surface of the concave mirror 31 (the surface opposite to the reflecting surface 311). Constituent elements similar to those in the above embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  The background object 72 has a function of absorbing incident light. The background object 72 is, for example, a synthetic resin molded product, and the color of the background object 72 is darker than the inner surface of the storage chamber 41, for example, black. The background object 72 is fixed to the back surface of the concave mirror 31 by a method such as adhesion.

  Since the background object 72 attached to the back surface of the concave mirror 31 absorbs light, the light transmitted through the concave mirror 31 from the back surface of the concave mirror 31 is reduced, so that the contrast of the image reflected by the concave mirror 31 is increased, and the display unit It becomes easy to see 20 images (virtual image 300).

  Instead of attaching the background object 72 to the back surface of the concave mirror 31, a black coating film may be formed on the back surface of the concave mirror 31, and light transmitted through the concave mirror 31 from the back surface of the concave mirror 31 can be reduced.

  In the display systems 10 and 10A of the embodiment and the first modification, the background objects 71 and 72 have a function of absorbing light, but may have a function of scattering light.

  The background objects 71 and 72 may be provided with a function of scattering light by providing fine irregularities on the surfaces of the background objects 71 and 72 or roughening the surfaces of the background objects 71 and 72. Since the light incident on the background objects 71 and 72 is scattered on the surfaces of the background objects 71 and 72, the light incident on the back surface of the concave mirror 31 can be reduced. Further, by forming a so-called moth-eye structure on the surfaces of the background objects 71 and 72, reflection on the surfaces of the background objects 71 and 72 may be suppressed.

(3.2) Modification 2
In the display system 10 according to the embodiment and the first modification, the display unit 20 includes two polarizing members (the first polarizing member 231 and the second polarizing member 232). You may also use it.

  FIG. 9 is a schematic explanatory diagram illustrating a main part of a display system 10B according to the second modification. The display unit 20 includes a light source device 21, a liquid crystal substrate 22, and a polarizing member 23. Constituent elements similar to those in the above embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  The polarizing member 23 is disposed between the liquid crystal substrate 22 and the light source device 21. In the polarizing member 23 and the polarizing filter 70, the polarization axis of the polarizing member 23 and the polarizing axis of the polarizing filter 70 are orthogonal to each other on a plane orthogonal to the optical path through which the light output from the display unit 20 (that is, the light source device 21) passes. It is arranged in such a positional relationship.

  As a result, when a voltage is applied to the liquid crystal layer via the electrodes of the liquid crystal substrate 22 by the display control unit 50, the transmittance of light transmitted through the polarizing member 23 and the polarizing filter 70 changes and is output from the polarizing filter 70. An image is formed by the light. In the second modification, the second polarizing member 232 can be omitted as compared with the first embodiment, so that the cost of parts can be reduced. Also in the modified example 2, when outside light is incident from the outside of the housing 40 via the beam splitter 43, only polarized light along the polarization axis of the polarizing filter 70 out of the outside light passes through the polarizing filter 70. It is possible to reduce external light incident on the.

(3.3) Other Modifications The display systems 10, 10 </ b> A, and 10 </ b> B according to the above embodiment and Modifications 1 and 2 include the concave mirror 31, the beam splitter 43, and the polarization filter 70 as the light attenuating unit. One or more of the beam splitter 43 and the polarizing filter 70 may be provided as the light attenuating unit.

  The display systems 10, 10 </ b> A, and 10 </ b> B according to the above embodiment and the first and second modifications include the magnifying optical system 30 that includes only the concave mirror 31, but includes a plane mirror 32 and a concave mirror 31 as illustrated in FIG. 10. A magnifying optical system 30A may be provided. Constituent elements similar to those in the above embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  In the magnifying optical system 30A of the display system 10C shown in FIG. 10, the image displayed on the display unit 20 is reflected by the plane mirror 32 and the concave mirror 31 (that is, reflected twice) and output. Therefore, if the viewing distance of the virtual image 300 is the same, the volume of the storage chamber 41 can be reduced and the housing 40 can be downsized compared to the case where the number of reflections in the magnifying optical system 30A is one. The configurations of the magnifying optical systems 30 and 30A are not limited to the configurations of the above-described embodiments and modifications, and can be appropriately changed. When the magnifying optical system 30 is configured by the magnifying optical system, the number of times of light reflection May be one or more times.

  In the display systems 10 and 10A to 10C of the above-described embodiments and modifications, the magnifying optical systems 30 and 30A are configured only by mirrors (concave mirror 31 and plane mirror 32), but the magnifying optical systems 30 and 30A are convex lenses. A convex lens may be provided with a function of reducing infrared light. FIG. 11 shows an example of the convex lens 33 provided in the magnifying optical systems 30 and 30A, and the convex lens 33 is arranged in the middle of the optical path of the magnifying optical systems 30 and 30A. A reflection film that reflects infrared light is formed on the surface 331 of the convex lens 33 on which light from the display unit 20 is incident. On the other hand, the surface 332 opposite to the surface 331 in the convex lens 33 is not formed with a reflective film that reflects infrared light, and transmits infrared light.

  As a result, when external light such as sunlight entering from the outside of the housing 40 enters the inside of the convex lens 33 from the surface 332 of the convex lens 33, it is reflected by the reflection film provided on the surface 331 on the opposite side of the convex lens 33. Therefore, external light such as sunlight entering the display unit 20 can be reduced.

  Further, in the display systems 10 and 10A to 10C according to the above-described embodiments and modifications, the mirrors (concave mirror 31 and plane mirror 32) constituting the magnifying optical systems 30 and 30A reflect only visible light and transmit infrared light. It may be a mirror. If the mirrors constituting the magnifying optical systems 30 and 30A are cold mirrors, the infrared light incident from the outside of the housing 40 passes through the mirror made of the cold mirrors, and is reflected by the magnifying optical systems 30 and 30A to be displayed on the display unit. Infrared light incident on 20 can be reduced. When the magnifying optical systems 30 and 30A include a plurality of mirrors, at least one of the plurality of mirrors may be a cold mirror, and the red light that is reflected by the magnifying optical systems 30 and 30A and enters the display unit 20. External light can be reduced.

  In the display systems 10 and 10A to 10C of the above-described embodiment and the modified examples, a film that transmits visible light and reflects infrared light may be formed on the light transmitting member that covers the opening 42. Thereby, since infrared light is reflected by the reflective film when sunlight enters the opening, light such as sunlight entering the display unit 20 can be reduced.

  Further, the display systems 10 and 10A to 10C of the above embodiment and the modification are mounted on the main body 110 of the automobile 100. As shown in FIG. 12, the rear window 104 and the side window on the rear seat side of the automobile 100 are provided. For 105, glass that reduces infrared light may be used. Here, the housing 40 of the display systems 10, 10 </ b> A to 10 </ b> C is a position where external light is incident from the rear window 104 and the side window 105 on the rear seat side, and is difficult for external light to enter from the side window 106 on the front seat side. It suffices if they are arranged.

  As a result, the light whose infrared light has been reduced by the rear window 104 and the side window 105 on the rear seat side is incident on the inside of the housing 40. Therefore, the infrared light that is incident on the display unit 20 through the magnifying optical systems 30 and 30A. Light is reduced. In the above embodiment, since the housing 40 is supported by the ball joint 60, the orientation of the housing 40 can be adjusted. However, the housing 40 does not face the direction in which external light enters from the side window 106 on the front seat side. The adjustment range may be limited.

  The magnifying optical systems 30 and 30A include one or more mirrors (concave mirror 31 and plane mirror 32) that reflect light, but the magnifying optical systems 30 and 30A include an aberration correction unit for reducing aberrations. It is preferable. For example, the reflecting surface of the mirror included in the magnifying optical systems 30 and 30A may be a free curved surface, and the aberration correcting unit is realized by the reflecting surface formed by the free curved surface. A free-form surface is a curved surface formed by setting a plurality of intersections and curvatures in a space and interpolating between the plurality of intersections with a high-order equation. By making the reflecting surfaces of the mirrors included in the magnifying optical systems 30 and 30A into free-form surfaces, optical design that reduces aberrations becomes possible. The aberration correction unit is not limited to a configuration in which the reflecting surface is a free-form surface, and may be one that corrects aberrations by other methods, for example, by correcting an image displayed on the display unit 20 so that aberrations are reduced. Also good.

  In the display systems 10 and 10A of the embodiment and the modification, the display unit 20 is a liquid crystal display device including the liquid crystal substrate 22 and the light source device 21, but the display unit 20 is an OLED (Organic Light Emitting Diode) or the like. A self-luminous display panel may be provided. Further, the display unit 20 may be configured to draw an image on the screen by scanning the diffuse transmission screen with laser light from behind the screen. The display unit 20 may be configured to project an image with a projector from the back of the screen on a diffuse transmission screen.

  In the display systems 10 and 10A of the above-described embodiment and the modified example, the opening 42 of the housing 40 is covered with the beam splitter 43 that is transmissive to visible light, but the light transmitting member that covers the opening 42 is It is not limited to the beam splitter 43. The light transmissive member that covers the opening 42 may be a transparent glass plate or a transparent plate formed of a synthetic resin (for example, polycarbonate resin, acrylic resin, etc.) that is transmissive to visible light. “Having transparency to visible light” means that the transmittance for visible light is 50% or more, preferably 70% or more, more preferably 90% or more.

  The display systems 10 and 10A of the embodiment and the modified example are not limited to the configuration that displays the captured image of the rear of the automobile 100, for example, an image based on the captured image of the rear side, the side, or the front of the automobile 100. It may be displayed.

  The electronic mirror system 80 including the display systems 10 and 10A according to the above-described embodiments and modifications is not limited to the one applied to the automobile 100. For example, a motorcycle, a train, an aircraft, a construction machine, a ship, and the like other than the automobile 100 are used. It can also be applied to moving objects.

  Further, the display systems 10 and 10A are not limited to one device, and may be configured by a plurality of devices. That is, the functions of the display systems 10 and 10A may be distributed and provided in two or more devices. The display control unit 50 may be provided in an ECU of the automobile 100 or a server device outside the automobile 100. In this case, an image to be displayed on the display unit 20 is created by the ECU or the server device.

(Summary)
As described above, the display system (10, 10A to 10C) of the first aspect includes the display unit (20), the magnifying optical system (30, 30A), and the light attenuating unit (31, 43, 70). . The display unit (20) displays an image based on the captured image. The magnifying optical system (30, 30A) enlarges and outputs the image displayed on the display unit (20). The light attenuating unit (31, 43, 70) attenuates external light incident on the display unit (20) via the magnifying optical system (30, 30A).

  According to the display system (10, 10A to 10C) of the first aspect, since the external light is attenuated by the light attenuating unit (31, 43, 70), the display unit (20 ) Can be reduced. Therefore, even when sunlight etc. enter, the damage added to the surface of a display part (20) can be reduced.

  In the display system (10, 10A to 10C) of the second aspect, in the first aspect, the magnifying optical system (30, 30A) has a mirror (31, 32), and the light attenuation section (31, 43, 70). ) Is made up of mirrors (31, 32).

  According to the display system (10, 10A to 10C) of the second aspect, the mirror (31, 32) included in the magnifying optical system (30, 30A) can also serve as the light attenuation unit.

  In the display system (10, 10A to 10C) of the third aspect, in the first or second aspect, the light attenuating unit (43) is arranged in an optical path where external light is incident on the magnifying optical system (30, 30A). Has been placed.

  According to the display system (10, 10A to 10C) of the third aspect, the light attenuating unit (43) can attenuate external light incident on the magnification optical system (30, 30A).

  In the display system (10, 10A to 10C) of the fourth aspect, in the third aspect, the light attenuating unit (31, 43, 70) reflects a part of the incident light and reflects the incident light. It is a beam splitter (43) which transmits the other part of them.

  According to the display system (10, 10A to 10C) of the fourth aspect, the beam splitter (43) transmits a part of the incident light, so that it is before entering the magnifying optical system (30, 30A). Light can be attenuated.

  In the display system (10, 10A to 10C) of the fifth aspect, in the third aspect, the light attenuating section (31, 43, 70) is a polarizing filter (70).

  According to the display system (10, 10A to 10C) of the fifth aspect, since the polarization filter (70) passes only the polarized light along the polarization axis, the passing light can be attenuated, and the magnification optical system (30, 30A). ) Can be used to attenuate external light incident on the display unit (20).

  In the display system (10, 10A to 10C) of the sixth aspect, in the fifth aspect, the display unit (20) includes a light source device (21) that emits light, a liquid crystal substrate (22), and a first polarized light. A member (231) and a second polarizing member (232) are provided. Light from the light source device (21) is incident on the liquid crystal substrate (22). The first polarizing member (231) is disposed between the light source device (21) and the liquid crystal substrate (22). The second polarizing member (232) is disposed on the opposite side of the liquid crystal substrate (22) from the first polarizing member (231). The polarization axis of the first polarizing member (231) and the polarization axis of the second polarizing member (232) are orthogonal to each other, and the polarizing filter (70) is on the plane orthogonal to the optical path of the light output from the display unit (20). The polarizing filter (70) is arranged in such a positional relationship that the polarizing axis of () coincides with the polarizing axis of the second polarizing member (232).

  According to the display system (10, 10A to 10C) of the sixth aspect, the light transmitted through the second polarizing member (231) of the display unit (20) is suppressed from being attenuated by the second polarizing member (232). it can.

  In the display system (10, 10A to 10C) of the seventh aspect, in the fifth aspect, the display unit (20) receives light from the light source device (21) that emits light and the light source device (21). A liquid crystal substrate (22) and a polarizing member (23). The polarizing member (23) is disposed between the light source device (21) and the liquid crystal substrate (22). The polarization filter (70) is arranged in a positional relationship such that the polarization axis of the polarization filter (70) is orthogonal to the polarization axis of the polarization member (23) on a plane orthogonal to the optical path of the light output from the display unit (20). Is done.

  According to the display system (10, 10A to 10C) of the seventh aspect, the polarizing filter (70) can also be used as the polarizing member disposed on the front side of the liquid crystal substrate (22).

  In the display system (10, 10A to 10C) of the eighth aspect, in any one of the first to seventh aspects, the magnifying optical system (30, 30A) has a concave mirror (31).

  According to the display system (10, 10A to 10C) of the eighth aspect, the image can be enlarged by the concave mirror (31).

  In the display system (10, 10A to 10C) of the ninth aspect, in any one of the first to eighth aspects, the limit resolution of the image displayed at the predetermined display position by the magnifying optical system (30, 30A) is exceeded. The resolution of the display unit (20) is high.

  According to the display system (10, 10A to 10C) of the ninth aspect, the resolution of the display unit (20) is made higher than the limit resolution of the image displayed at the display position, so that a high-resolution image is displayed at the display position. Can be displayed, and the user viewing the image can feel a stereoscopic effect.

  In the display system (10, 10A to 10C) of the tenth aspect, in any one of the first to ninth aspects, the magnifying optical system (30, 30A) includes the reflecting mirror (31), and the reflecting mirror ( A background object (71, 72) that performs at least one of light absorption and scattering is disposed behind 31).

  According to the display system (10, 10A to 10C) of the tenth aspect, the background object (71, 72) absorbs or scatters light, and enters the reflecting mirror (31) from behind the reflecting mirror (31). Therefore, the contrast of the image reflected by the reflecting mirror (31) can be improved.

  The electronic mirror system (80) according to the eleventh aspect includes the display system (10, 10A to 10C) according to any one of the first to tenth aspects, and an imaging unit (90) that outputs a captured image.

  According to the electronic mirror system (80) of the eleventh aspect, the external light condensed on the surface of the display unit (20) by the magnifying optical system (30, 30A) can be reduced.

  The movable body (100) of the twelfth aspect includes the electronic mirror system (80) of the eleventh aspect and a movable body main body (110) on which the electronic mirror system (80) is mounted.

  According to the movable body (100) of the twelfth aspect, the movement is provided with the electronic mirror system (80) that can reduce the external light collected on the surface of the display unit (20) by the magnifying optical system (30, 30A). A body (100) can be provided.

  About the structure which concerns on a 2nd-10th aspect, it is not an essential structure for a display system (10,10A-10C), and can be abbreviate | omitted suitably.

  About a 9th aspect, it is an aspect which can be implemented independently, Comprising: It is not essential to presuppose any 1st-8th aspect. In this case, in the display system (10, 10A to 10C), it is not an essential configuration to include the light attenuation unit.

10, 10A to 10C Display system 20 Display unit 21 Light source device 22 Liquid crystal substrate 23 Polarizing member 30 Magnifying optical system 31 Concave mirror (light attenuating unit, mirror)
32 Plane mirror (light attenuation part, mirror)
40 housing 41 storage chamber 42 opening 43 beam splitter (light attenuating part)
70 Polarizing filter (light attenuator)
71, 72 Background object 80 Electronic mirror system 90 Imaging unit 100 Moving body 110 Moving body main body 231 First polarizing member 232 Second polarizing member

Claims (12)

A display unit for displaying an image based on the captured image;
An enlarged optical system for enlarging and outputting the image displayed on the display unit;
A light attenuating unit for attenuating external light incident on the display unit via the magnifying optical system. The magnifying optical system has a mirror;
The display system according to claim 1, wherein the light attenuation unit includes the mirror. The display system according to claim 1, wherein the light attenuating unit is disposed in an optical path where the external light is incident on the magnifying optical system. The display system according to claim 3, wherein the light attenuating unit is a beam splitter that reflects a part of incident light and transmits another part of incident light. The display system according to claim 3, wherein the light attenuation unit is a polarization filter. The display unit emits light, a liquid crystal substrate on which light from the light source device is incident, a first polarizing member disposed between the light source device and the liquid crystal substrate, and the liquid crystal substrate A second polarizing member disposed on the opposite side of the first polarizing member,
The polarization axis of the first polarizing member and the polarization axis of the second polarizing member are orthogonal to each other,
The polarization filter is disposed in a positional relationship such that a polarization axis of the polarization filter coincides with a polarization axis of the second polarization member on a plane orthogonal to an optical path of light output from the display unit. Display system described. The display unit includes a light source device that emits light, a liquid crystal substrate on which light from the light source device is incident, and a polarizing member that is disposed between the light source device and the liquid crystal substrate.
The polarization filter is arranged in a positional relationship such that a polarization axis of the polarization filter is orthogonal to a polarization axis of the polarizing member on a plane orthogonal to an optical path of light output from the display unit. Display system. The display system according to claim 1, wherein the magnifying optical system includes a concave mirror. The display system according to claim 1, wherein a resolution of the display unit is higher than a limit resolution of the image displayed at a predetermined display position by the magnifying optical system. The magnifying optical system has a reflecting mirror;
The display system according to any one of claims 1 to 9, wherein a background object that performs at least one of light absorption and scattering is disposed behind the reflecting mirror. A display system according to any one of claims 1 to 10,
An electronic mirror system comprising: an imaging unit that outputs the captured image. An electronic mirror system according to claim 11,
A mobile body on which the electronic mirror system is mounted.

Images