JP2017194548A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of reducing the amount of travel of the line of sight when visually recognizing information displayed by a real image and information displayed by an imaginary image.SOLUTION: A display device (100) includes: a light source part (1); a second screen (2); and an interlayer (61). The display device (100) forms an imaginary image by projecting an image onto a first transparent screen (7). The light source part (1) projects a first image light including a first image and a second image light including a second image. The second screen (2) projects a first image as an intermediate image by receiving the first image light. The interlayer (61) emits light for itself by receiving the second image light to display the second image. The first image projected onto the second screen (2) is formed as an imaginary image (5). The interlayer (61) is installed in the first screen (7).SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image display device of a head-up display type that displays information to be notified to a driver such as an instrument panel of a vehicle or navigation information in a state of being superimposed on a landscape in front of the vehicle.

  In recent years, an increasing number of vehicles are equipped with a head-up display (Head-Up Display, hereinafter referred to as HUD). The HUD allows the driver to confirm information with a small movement of the viewpoint while driving. The HUD displays various information useful for driving as virtual images. The HUD is a device that projects such information in a state where the information is superimposed on an outside scene in front of the vehicle. “Superimposition” means overlapping.

  Therefore, the driver can grasp information in a short time. Further, the HUD can reduce movement and focusing of the driver's line of sight. Usually, the display device of HUD projects a display image toward a front windshield. And this display apparatus is often installed in the dashboard of a vehicle.

  The following Patent Document 1 discloses a head-up display that allows a driver to visually recognize a display image without looking away from the forward field of view by displaying the display image in the distance by a virtual image.

Japanese Patent Laid-Open No. 6-144083

  However, in Patent Document 1, the driver needs to confirm information other than the information displayed on the head-up display, for example, with a conventional display device arranged on the dashboard. For this reason, the driver cannot view each information at the same time. And the subject that the eyes | visual_axis movement at the time of visually recognizing each information had the subject.

  The present invention has been made to solve the above-described problems, and provides an image display device that displays a first video as a real image and a second video as a virtual image on a front windshield. That is, the video displayed as a virtual image and the video displayed as a real image are both displayed on the front windshield.

  The display device of the present invention is a display device that forms a virtual image by projecting an image on a transparent first screen, and a first image light including the first image and a second image including the second image. A light source unit that projects light, a second screen that receives the first image light and displays the first image as an intermediate image, and receives the second image light and emits light by itself. An intermediate film for displaying the second image, and forming the first image projected on the second screen as the virtual image, and the intermediate film is provided on the first screen.

  According to the present invention, it is possible to reduce the amount of line-of-sight movement when visually recognizing information displayed as a real image and information displayed as a virtual image.

1 is a configuration diagram showing an image display device 100 according to Embodiment 1 of the present invention. It is a figure which shows a mode that the display image | video projected by the image display apparatus 100 which concerns on Embodiment 1 of this invention was seen from the driver | operator's eyes 95. FIG. It is a block diagram which shows the structure of the light source part 10 of the image display apparatus 100 which concerns on Embodiment 1 of this invention. It is a schematic diagram regarding the raster scanning of the MEMS mirror apparatus 15 which concerns on Embodiment 1 of this invention. It is a schematic diagram for demonstrating the case where the display area | region of an image | video is divided and a 1st image | video and a 2nd image | video are projected. It is a structural diagram which shows the structure of the front windshield 7 which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram schematically showing an image display device 100 according to the first embodiment. In the first embodiment, a laser scan type image display apparatus 100 will be described as an example.

  As shown in FIG. 1, the image display device 100 includes a light source unit 1, a screen 2, and a self-light emitting intermediate film 61. The image display device 100 can include the magnifying mirror 3 and the mirror 4.

  The light source unit 1 is disposed, for example, inside a dashboard.

  The light source unit 1 emits image light. “Image light” means light having image information. In the following, the first image and the second image are images projected by the light source unit 1.

  The screen 2 projects the first image projected from the light source unit 1 as an intermediate image. The screen 2 has a function of spreading incident light rays. The screen 2 is formed of, for example, a microlens array. The angle at which the incident light beam spreads is determined by the size of the microlens array or the focal length. When the incident light is laser light, speckle noise due to the laser is reduced.

  The magnifying mirror 3 reflects the intermediate image projected on the screen 2 toward the front windshield 7. The magnifying mirror 3 has a function of correcting the distortion of the virtual image 5. The magnifying mirror 3 has a function of forming an eye box. The “eye box” is a “view window”, and the driver can visually recognize the virtual image 5 within the range of the eye box.

  The mirror 4 reflects the second image projected from the light source unit 1 toward the front windshield 7.

  The self-light emitting intermediate film 61 receives the light of the second image and emits light by itself to display the second image. For example, the self-light emitting intermediate film 61 contains luminescent particles that are excited by excitation light to emit fluorescence.

  The first video is projected on the screen 2. Then, an intermediate image of the first video is formed on the screen 2. The intermediate image is a real image obtained by projecting image light onto a transmissive screen.

  The intermediate image on the screen 2 is projected on the front windshield 7 by the magnifying mirror 3. From the driver's eyes 95, the first image projected on the front windshield 7 appears as a virtual image 5. And the 1st image is seen in the state superimposed on the scenery ahead of vehicles.

  The second image projected by the light source unit 1 is projected toward the front windshield 7 by the mirror 4. The front windshield 7 includes a self-light emitting intermediate film 61. The self-light emitting intermediate film 61 emits light by itself when irradiated with light in a specific wavelength region.

  A windshield is a glass attached to an automobile or the like for preventing wind. The windshield may be made of plastic such as acrylic in addition to glass. The front windshield 7 is a windshield attached to the front side of the vehicle.

  The image display apparatus 100 forms a virtual image by projecting an image on a transparent screen. The front windshield 7 is an example of this transparent screen.

  Here, for example, the light applied to the self-light emitting intermediate film 61 is laser light. For example, the self-light emitting intermediate film 61 emits light by being irradiated with laser light emitted from the blue semiconductor laser 11B. In the first embodiment, the blue semiconductor laser 11B is a light source for the second image.

  The laser light reflected from the mirror 4 toward the front windshield 7 is applied to the self-light emitting intermediate film 61 on the front windshield 7. Then, the real image 6 of the second video is displayed on the front windshield 7. From the driver's eyes 95, the second image is visually recognized as a real image 6 on the front windshield 7.

  FIG. 2 is a schematic diagram showing a state in which the first video (virtual image 5) and the second video (real image 6) projected by the image display device 100 are viewed from the driver's eye 95. FIG.

  As shown in FIG. 2, the vehicle has a handle on the right side. A real image 6 is displayed on the front windshield 7 at a position above the handle. In FIG. 2, the real image 6 is a vehicle speed display. A virtual image 5 is displayed above the real image 6. In FIG. 2, the virtual image 5 is an arrow that faces the traveling direction of the vehicle. A signal can be seen on the left side through the front windshield 7.

  In this way, by projecting the first image of the virtual image 5 and the second image of the real image 6 on the front windshield 7, the time required for moving the eyes of the driver's eyes 95 can be shortened and the visibility can be improved. Can do.

  FIG. 3 is a configuration diagram schematically showing the configuration of the light source unit 1.

  As shown in FIG. 3, the light source unit 1 according to the first embodiment includes a semiconductor laser 11, a multiplexing prism 12, a lens 13, a mirror 14, and a MEMS (Micro Electric Mechanical System) mirror device 15.

  The semiconductor laser 11 includes a red semiconductor laser 11R, a green semiconductor laser 11G, and a blue semiconductor laser 11B. The semiconductor laser 11 emits a laser beam 16. The red semiconductor laser 11R emits a red laser beam 16R. The green semiconductor laser 11G emits a green laser beam 16G. The blue semiconductor laser 11B emits a blue laser beam 16B.

  For example, the multiplexing prism 12 reflects the laser beam 16R emitted from the red semiconductor laser 11R. The combining prism 12 transmits the laser beam 16G emitted from the green semiconductor laser 11G. As a result, the laser beams 16R and 16G become a composite wave (laser beam 16RG) on the same axis. That is, these laser beams 16R and 16G are synthesized on the same axis.

  For example, the lens 13 condenses the laser beam 16 emitted from the semiconductor laser 11. The lens 13 changes the divergence angle of the laser light 16 emitted from the semiconductor laser 11.

  The lens 13 includes a lens 13a, a lens 13b, and a lens 13c. The lens 13a condenses the laser beam 16R emitted from the red semiconductor laser 11R. The lens 13b condenses the laser beam 16G emitted from the green semiconductor laser 11G. The lens 13c condenses the laser beam 16B emitted from the blue semiconductor laser 11B.

  The mirror 14 includes a mirror 14a and a mirror 14b. The mirror 14a reflects the laser beam 16R emitted from the red semiconductor laser 11R and the laser beam 16G emitted from the green semiconductor laser 11G. That is, the mirror 14a reflects the synthesized laser beam 16RG. The mirror 14b reflects the laser beam 16B emitted from the blue semiconductor laser 11B. The laser beam reflected by the mirrors 14 a and 14 b reaches the MEMS mirror device 15.

  The MEMS mirror device 15 scans the laser beam reflected by the mirrors 14a and 14b two-dimensionally. The MEMS mirror device 15 includes a MEMS mirror 15a. The MEMS mirror device 15 scans the laser beam two-dimensionally by changing the tilt of the MEMS mirror 15a. The light scanned by the MEMS mirror device 15 reaches the screen 2.

  “MEMS” is a small machine that is electrically driven, made by processing silicon or plastic with microfabrication technology. The MEMS mirror device 15 projects an image by electrically changing the angle of the MEMS mirror 15a. Here, the MEMS mirror 15a is an example of a mirror that scans light.

  The control unit 8 performs output adjustment of the semiconductor laser 11 or on / off control of the semiconductor laser 11 based on the displayed image information 9. Here, the output adjustment is, for example, to reduce the output of the semiconductor laser 11 when displaying a dark image, and to increase the output of the semiconductor laser 11 when displaying a bright image. “On / off control” is control for turning on or off the semiconductor laser 11. An image is formed on the screen 2 by blinking each semiconductor laser 11.

  The first image is formed by the laser beam 16RG. That is, the first image is projected by the red semiconductor laser 11R and the green semiconductor laser 11G. The second image is formed by the laser beam 16B. That is, the second image is projected by the blue semiconductor laser 11B.

  As shown in FIG. 3, the incident angle of the laser beam 16RG when entering the MEMS mirror device 15 is different from the incident angle of the laser beam 16B. Therefore, the first video and the second video are projected at different positions.

  In the first embodiment, the laser beam 16RG reaches the screen 2. Then, the laser beam 16B reaches the mirror 4. The first image is formed by the laser beam 16RG. The second image is formed by the laser beam 16B.

  FIG. 4 is a schematic diagram showing scanning of the laser beams 16RG and 16B by the MEMS mirror device 15. As shown in FIG. In FIG. 4, components in front of the mirrors 14 a and 14 b are omitted to simplify the drawing.

  As shown in FIG. 4, the laser beam 16R emitted from the red semiconductor laser 11R and the laser beam 16G emitted from the green semiconductor laser 11G are combined by the combining prism 12 to become a laser beam 16RG. Laser beam 16RG is reflected by mirror 14a. Then, the laser beam 16RG enters the MEMS mirror device 15.

  The laser beam 16B emitted from the blue semiconductor laser 11B is reflected by the mirror 14b. Then, the laser beam 16 </ b> B enters the MEMS mirror device 15.

  The laser beams 16RG and 16B are incident on the MEMS mirror device 15 from the mirrors 14a and 14b at different angles, respectively. Then, the laser beams 16RG and 16B are reflected by the MEMS mirror device 15.

  The laser beams 16RG and 16B reflected by the MEMS mirror device 15 are raster scanned, for example. By this. The virtual image 5 of the first video and the real image 6 of the second video are projected at different positions. The first image of the virtual image 5 and the second image of the real image 6 are displayed simultaneously.

  “Raster scanning” is a method of drawing by drawing the entire field in a raster shape. Here, scanning is performed with a laser beam. A “raster” is a pattern formed by arranging a plurality of scanning lines.

  The control unit 8 controls each semiconductor laser 11 to form the first video and the second video.

  In the first embodiment, the incident angle of the laser beam 16RG to the MEMS mirror device 15 is different from the incident angle of the laser beam 16B to the MEMS mirror device 15. The laser beam 16RG forms a first image. The laser beam 16B forms a second image. Thereby, the image display apparatus 100 projects the first video and the second video at different positions.

  FIG. 5 is a schematic diagram illustrating an example in which the first video (virtual image 5) and the second video (real image 6) are projected separately. In FIG. 5, unlike FIG. 4, the incident angles of the laser beams 16RG and 16B to the MEMS mirror device 15 are the same.

  The laser beam 16RG and the laser beam 16B are lit at different times to display an image. The laser beam 16RG displays the virtual image 5. The laser beam 16B displays the real image 6.

  As shown in FIG. 5, the optical axes of the laser beams 16RG and 16B when entering the MEMS mirror device 15 are the same. The area where the first video is displayed is different from the area where the second video is displayed. That is, in the area where the real image 6 is displayed, the laser light sources 11R and 11G are turned on and the laser light source 11B is turned off. On the other hand, in the area where the virtual image 5 is displayed, the laser light sources 11R and 11G are turned off and the laser light source 11B is turned on.

  The image display apparatus of the projection method shown in FIG. 4 can increase the size of the area where the first video is displayed and the area where the second video is displayed, as compared with the image display apparatus of the projection method shown in FIG. Moreover, the image display apparatus of the projection method shown in FIG. 4 can improve the number of pixels of the first video and the second video.

  In the first embodiment, the second video is displayed as a real image 6 on the front windshield 7. Therefore, the front windshield 7 needs to include the light emitting layer 71. The light emitting layer 71 contains light emitting particles that emit fluorescence with light in a specific wavelength region.

  FIG. 6 is a structural diagram showing the structure of the front windshield 7.

  In the front windshield 7 of FIG. 6, a light emitting layer 71 is laminated between a pair of glass plates 72 and 73.

  The light emitting layer 71 shown in Embodiment 1 emits fluorescence by irradiating light in the wavelength region of the blue semiconductor laser 11B. The light emitting layer 71 is colored.

  Therefore, the second image is drawn using the blue semiconductor laser 11B. Here, the second video is displayed as a real image 6. The light emitting layer 71 develops color in the wavelength region of the blue semiconductor laser 11B.

  On the other hand, the first image is drawn using the red semiconductor laser 11R and the green semiconductor laser 11G. Here, the first video is displayed as a virtual image 5. The red semiconductor laser 11R and the green semiconductor laser 11G are semiconductor lasers having wavelengths other than the wavelength region in which the light emitting layer 71 develops color.

  According to the image display device 100 according to the first embodiment, both the first video and the second video are displayed on the front windshield 7 as viewed from the driver's eyes 95. The first video is displayed as a virtual image 5. The second video is displayed as a real image 6. Therefore, when visually recognizing the information of the first video and the information of the second video, the amount of line-of-sight movement can be reduced.

  Further, according to the image display device 100 according to the first embodiment, the incident angle to the MEMS mirror device 15 is different between the laser beam 16RG and the laser beam 11B. And the image display apparatus 100 is projecting the 1st image | video and the 2nd image | video by the one MEMS mirror apparatus 15 by changing the incident angle to the MEMS mirror apparatus 15 of the laser beam 16RG and the laser beam 11B. And the image display apparatus 100 is displaying the 1st image | video and the 2nd image | video simultaneously.

  The laser beam 16R is emitted from the red semiconductor laser 11R. The laser beam 16G is emitted from the green semiconductor laser 11G. The laser beam 11B is emitted from the blue semiconductor laser 11B. The first image is drawn by the laser beams 16R and 16G. The second image is drawn by the laser beam 16B.

  Therefore, in each of the first video and the second video, the angle of view, the resolution, and the brightness are the same as when the MEMS mirror device 15 projects one video.

  In addition, although embodiment of this invention was described as mentioned above, this invention is not limited to these embodiment.

  In the above-described embodiment, the image display device 100 mounted on a vehicle such as an automobile is taken as an example. However, the present invention is not limited to this, and the present invention can be applied to an apparatus having an image display function for various devices used in ships, aircraft, factory facilities, and the like.

  100 image display device, 1 light source, 11 semiconductor laser, 11R red semiconductor laser, 11G green semiconductor laser, 11B blue semiconductor laser, 16, 16R, 16G, 16B, 16RG laser beam, 12 combining prism, 13 lens, 4,14 Mirror, 15 MEMS mirror device, 15a MEMS mirror, 2 screen, 3 magnifying mirror, 5 virtual image, 6 real image, 7 front windshield, 71 light emitting layer, 72, 73 glass plate, 8 control unit, 9 displayed image information, 95 Driver's eyes.

Claims (4)

In a display device that forms a virtual image by projecting an image on a transparent first screen,
A light source unit that projects first video light including a first video and second video light including a second video;
A second screen that receives the first video light and displays the first video as an intermediate image;
An intermediate film that displays the second image by receiving the second image light and emitting light by itself;
The first image projected on the second screen is formed as the virtual image;
The intermediate film is a display device provided in the first screen. The light source unit includes a first light source, a second light source, and a third mirror,
The incident angle when the first light beam emitted from the first light source is incident on the third mirror is a first incident angle, and the second light beam emitted from the second light source is the first light beam. If the incident angle when entering the mirror 3 is the second incident angle, the first incident angle is different from the second incident angle,
The third mirror scans the incident first and second rays in two dimensions,
The first image light is formed by the first light beam scanned by the third mirror;
The display device according to claim 1, wherein the second image light is formed by the second light beam scanned by the third mirror. The light source unit includes a third mirror,
The third mirror scans a third beam;
The first image is formed by scanning the third light beam in a first scanning period, and the second image is a second scanning period in which the third light beam is different from the first scanning period. The display device according to claim 1, wherein the display device is formed by scanning. The third light beam includes a first light beam and a second light beam;
The first light beam forms the first image light;
The second light beam forms the second image light;
The incident angle when the first light beam is incident on the third mirror is defined as a first incident angle, and the incident angle when the second light beam is incident on the third mirror is defined as a second incident angle. Then, the display device according to claim 3, wherein the first incident angle is equal to the second incident angle.

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