WO2017138430A1 - 表示装置及びヘッドアップディスプレイ - Google Patents
表示装置及びヘッドアップディスプレイ Download PDFInfo
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- WO2017138430A1 WO2017138430A1 PCT/JP2017/003820 JP2017003820W WO2017138430A1 WO 2017138430 A1 WO2017138430 A1 WO 2017138430A1 JP 2017003820 W JP2017003820 W JP 2017003820W WO 2017138430 A1 WO2017138430 A1 WO 2017138430A1
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- WIPO (PCT)
- Prior art keywords
- projection
- screen
- projection light
- light
- projector
- Prior art date
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- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 238000004904 shortening Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000003384 imaging method Methods 0.000 description 29
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
- B60K35/23—Head-up displays [HUD]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/80—Arrangements for controlling instruments
- B60K35/81—Arrangements for controlling instruments for controlling displays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/20—Optical features of instruments
- B60K2360/33—Illumination features
- B60K2360/334—Projection means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/60—Structural details of dashboards or instruments
- B60K2360/66—Projection screens or combiners
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0127—Head-up displays characterised by optical features comprising devices increasing the depth of field
Definitions
- the present invention relates to a display device capable of displaying images on a plurality of surfaces and a head-up display for visually recognizing an image displayed by the display device as a virtual image.
- a conventional head-up display is disclosed in Patent Document 1, for example.
- Such a head-up display projects projection light emitted from one projector (projector) onto each of a first screen and a second screen that are different in distance from the projector, and the first screen and the second screen.
- Each image displayed on the screen is projected on a transmission / reflection part located in front of the viewer.
- the virtual image based on the image displayed on the first screen and the virtual image based on the image displayed on the second screen are visually recognized at positions at different distances from the viewer.
- the projector 610 is on the first screen 620.
- the first projection light 630 for displaying the first image K1 and the second projection light 650 for displaying the second image K2 on the second screen 640 disposed closer to the projector 610 than the first screen 620 are provided.
- the light is emitted at substantially the same first projection distance R1, and the projection distance of the first projection light 630 is changed from the first projection distance R1 to the second on the path of the first projection light 630 between the projector 610 and the first screen 620.
- a projection distance extension 660 that extends to the projection distance R2 is provided.
- the projection distance extension unit 660 converts the image K11 that should have been displayed at the first projection distance R1 similar to that of the second screen 640 as the first image K1 on the first screen 620 away from the second screen 640. Make an image.
- the size of the first image K1 displayed on the first screen 620 is as follows.
- the image becomes larger than the image K11 that should have been displayed at the first projection distance R1.
- the resolution of the first image K1 displayed on the first screen 620 is lowered.
- the present invention provides a display device and a head-up display in which a decrease in image resolution is suppressed.
- a display device includes a projector that emits projection light having a first projection distance, and the first projector from the projector along the projection light.
- a first screen that receives the first projection light out of the projection light and displays a first image, and a distance along the projection light from the projector is greater than the first screen.
- a second screen that receives a second projection light different from the first projection light and displays a second image, and has a positive refractive power (positive optical power).
- a projection distance shortening unit that is disposed on the path of the second projection light between the projector and the second screen and shortens the projection distance of the second projection light. is there.
- a head-up display includes a projector that emits projection light having a first projection distance, and the first projection distance from the projector along the projection light.
- a first screen that receives the first projection light out of the projection light and displays a first image, and a distance along the projection light from the projector is shorter than the first screen.
- a second screen arranged to receive a second projection light different from the first projection light and to display a second image; a positive refractive power; the projector and the second screen.
- a projection distance shortening unit disposed on a path of the second projection light between the first projection light and the second projection light, and the first image and the second screen displayed on the first screen.
- the second image displayed on the viewer A projection unit that projects toward the transmission / reflection unit located on the side, and causes the viewer to visually recognize a virtual image based on the first image and the second image via the transmission / reflection unit,
- the screen is arranged so that an optical path of light based on the first image toward the viewer is shorter than an optical path of light based on the second image.
- the projection light emitted from one projector can display a plurality of images at different positions in the depth direction while suppressing a decrease in resolution.
- FIG. 1 is a schematic configuration diagram of a head-up display according to a first embodiment of the present invention.
- HUD head-up display
- the HUD 1 is mounted on, for example, an automobile, and as shown in FIG. 1, the display device 10, a plane mirror (projection unit) 30, a concave mirror (projection unit) 40, a housing 50, and a control board (illustrated). Not).
- the HUD 1 transmits the first display light N1 of the first image M1 and the second display light N2 of the second image M2 displayed on the display device 10 by using the plane mirror 30 and the concave mirror 40.
- Example) Reflecting toward 2 displays the first virtual image V1 of the first image M1 and the second virtual image V2 of the second image M2 to the viewer E.
- the display device 10 includes the first image M1 and the first image so that the distance of the first display light N1 until reaching the viewpoint of the viewer E is shorter than the distance of the second display light N2.
- Two images M2 are displayed. Thereby, the viewer E visually recognizes the first virtual image V1 based on the first image M1 at a position closer to the second virtual image V2 based on the second image M2.
- the housing 50 is made of, for example, black light-shielding synthetic resin, and houses the display device 10, the plane mirror 30, and the concave mirror 40 inside, and a control board (not shown) is attached to the outside.
- the housing 50 has an opening 50a that allows the display light N (the first display light N1 and the second display light N2) to pass through the windshield 2.
- the opening 50a is covered with a translucent cover 50b. Yes.
- the display device 10 displays a plurality of images at different positions in the depth direction.
- the display device 10 of the present embodiment displays two images, a first image M1 and a second image M2 that is farther in the depth direction than the first image M1.
- the display device 10 of the present invention may display images at three or more different positions in the depth direction. The configuration of the display device 10 will be described in detail later.
- the plane mirror (projection unit) 30 is obtained by forming a reflective film on the surface of a base material made of, for example, a synthetic resin or a glass material by means such as vapor deposition, and the first screen 23 and the second screen 24 of the display device 10 are provided.
- the first display light N1 based on the first image M1 to be displayed and the second display light N2 based on the second image M2 are reflected toward the concave mirror 40.
- the concave mirror (projection unit) 40 is obtained by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material by means such as vapor deposition, and the first display light N1 and the second display light N2 reflected by the plane mirror 30. Is a mirror having a concave free-form curved surface that further reflects and exits toward the windshield 2.
- the first display light N1 and the second display light N2 reflected by the concave mirror 40 pass through the translucent cover 50b provided in the opening 50a of the housing 50 and reach the windshield 2.
- the first display light N1 and the second display light N2 are reflected by the windshield 2 to the viewer E side, and the first virtual image V1 based on the first display light N1 and the second virtual image V2 based on the second display light N2 are visually recognized. Let the person E visually recognize it.
- the concave mirror 40 has a function as a magnifying glass, and may enlarge the first image M1 and the second image M2 displayed on the display device 10 and reflect them to the windshield 2 side.
- the concave mirror 40 may have a function of reducing distortion of the first virtual image V1 and the second virtual image V2 caused by the windshield 2 being a curved surface.
- FIG. 2 is a diagram for explaining the paths of the first projection light L1 and the second projection light L2 emitted from the projector 20, and in particular, emitted from predetermined pixels 201a and 202a of the display 200 described later. It is a figure explaining the path
- the display device 10 includes a projector 20 that emits projection light L, a first fold mirror 21 that reflects and reflects the projection light L from the projector 20, and a first fold mirror 21.
- the second fold mirror 22 that reflects and reflects the projection light L of the first projection light L, and the first projection light L1 of the projection light L is received by the back surface, and the first image M1 in which the first projection light L1 is formed on the front surface is displayed.
- a projection distance shortening unit 25 that is disposed on the path of the second projection light L2 between the second screen 24 and shortens the projection distance P of the second projection light L2.
- the projector 20 connects the display 200 that generates the projection light L and the projection light L generated by the display 200 with a screen farther from the projector 20 (first screen 23).
- a projection light L having a first projection distance P1 equal to the optical path length of the projection light L from the imaging unit 204 to the first screen 23 is emitted toward the first fold mirror 21.
- the projection light L emitted from the projector 20 toward the first screen 23 is referred to as the first projection light L1
- the projection light L toward the second screen 24 is referred to as the second projection light L2.
- the projection distance P here refers to the distance from the imaging unit 204 to the position where the projection light L is imaged, and may be called a projection distance, an imaging distance, an image plane distance, or the like.
- the first projection distance P1 included in the first projection light L1 and the second projection light L2 emitted from the projector 20 may not be strictly equal and may be approximately equal. Specifically, the first projection distance P1 of the first projection light L1 and the second projection light L2 only needs to be within the depth of focus Q that can generate a substantially focused image.
- the focal depth Q is the forward focal depth Qa on the projector 20 (imaging unit 204) side from the first projection distance P1, and the opposite side of the projector 20 (imaging unit 204) from the first projection distance P1.
- rear focal depth Qb Specifically, the focal depth Q has a range of about 6 mm, for example, the front focal depth Qa is 3 mm and the rear focal depth is 3 mm. Note that the depth of focus may be referred to as an image plane depth.
- the display 200 has a display area in which a plurality of pixels are arranged in a matrix.
- a reflective display element such as DMD (Digital MicroMirror Device) or LCOS (registered trademark: Liquid Crystal On Silicon) or a TFT (Thin Film).
- a transmissive display element such as a liquid crystal panel, and a first projection light L1 for displaying the first image M1 and a second image M2 for displaying the first image M1 based on a control signal from a control board (not shown).
- the projection light L including the two projection lights L ⁇ b> 2 is emitted toward the first fold mirror 21.
- the display area of the display device 200 includes a first display area 201 that generates the first projection light L1, a second display area 202 that generates the second projection light L2, a first display area 201, and a second display.
- the third display area 203 is located between the area 202 and is not displayed.
- a point 231 emitted from a pixel 201 a at the boundary with the third display region 203 in the first display region 201 and closest to the second screen 24 on the first screen 23.
- a point 241 on the second screen 24 closest to the first screen 23 is emitted from the pixel 202a at the boundary between the optical path of the imaging light beam 26 to be imaged and the third display region 203 of the second display region 202. Only the optical path of the imaging light beam 27 to be imaged is shown, and the other optical paths of the projection light L are omitted.
- the imaging unit 204 includes a single lens or a plurality of lenses, and projects the projection light L generated by the display device 200 toward the first screen 23 and the second screen 24 in an enlarged manner.
- the imaging unit 204 adjusts the projection distance P of the projection light L emitted from the projector 20.
- the imaging unit 204 performs the first projection in which the projection distance P of the projection light L (the first projection light L1 and the second projection light L2) is equal to the distance from the imaging unit 204 to the first screen 23. Adjust to the distance P1.
- the imaging unit 204 is focused from the imaging unit 204 toward the point 231 on the first screen 23 and focused toward the point 241 on the second screen 24.
- the light beam 27 is converged at the position of the first projection distance P1 from the imaging unit 204.
- the imaging unit 204 may include a single or a plurality of curved mirrors.
- the first fold mirror (reflecting unit) 21 is disposed on the path of the projection light L between the projector 20 and the second fold mirror 22, and the first projection light L 1 and the second projection emitted from the projector 20. It is composed of a plane mirror that does not have a refractive power (optical power) that reflects the light L2 on the same surface toward the second fold mirror 22. Since the optical path of the projection light L is folded by providing the first fold mirror 21, the package size in the primary direction of the display device 10 becomes more compact.
- the first fold mirror 21 of the present embodiment includes the imaging light beam 26 emitted from the pixel 201 a at the boundary between the first display area 201 and the third display area 203, and the third display area 202.
- first fold mirror 21 It is arranged closer to the projector 20 than the branch point 28 where the imaging light beam 27 emitted from the pixel 202a at the boundary with the region 203 branches (the first projection light L1 and the second projection light L2 branch).
- a plurality of first fold mirrors 21 may be provided between the projector 20 and the second fold mirror 22, and the first fold mirror 21 may be omitted. Further, the first fold mirror 21 may be arranged farther from the projector 20 than the branch point 28. When the first fold mirror 21 is thus arranged farther from the projector 20 than the branch point 28, the first fold mirror 21 receives the first projection light L1 and the second projection light L2. You may divide and provide by the fold mirror which receives light.
- the second fold mirror 22 is disposed on the path of the projection light L between the first fold mirror 21 and the first screen 23, and receives the first projection light L1 and the second projection light L2 emitted from the projector 20.
- the first screen 23 and the second screen 24 are configured by a plane mirror that does not have a refractive power (optical power) reflected. Since the optical path of the projection light L is folded by providing the second fold mirror 22, the package size in the primary direction of the display device 10 becomes more compact.
- the second fold mirror 22 of the present embodiment is disposed closer to the projector 20 than the branch point 28 where the first projection light L1 and the second projection light L2 branch. Thereby, the size of the second fold mirror 22 can be kept small.
- a plurality of second fold mirrors 22 may be provided between the first fold mirror 21 and the first screen 23, or the second fold mirror 22 may be omitted. Further, the second fold mirror 22 may be arranged farther from the projector 20 than the branch point 28. When the second fold mirror 22 is thus arranged farther from the projector 20 than the branch point 28, the second fold mirror 22 receives the first projection light L1 and the second projection light L2. You may divide and provide by the fold mirror which receives light.
- the first screen 23 is a transmissive screen having a flat surface or a curved surface, and includes, for example, a holographic diffuser, a microlens array, a diffusion plate, and the like, and enters the optical path of the first projection light L1 from the imaging unit 204 of the projector 20.
- the first projection light L1 that is disposed along the first projection distance P1 and emitted from the projector 20 is received on the back surface, and the first image M1 is displayed (imaged) on the front surface side.
- the first screen 23 displays the first image M1
- the first display light N1 indicating the first image M1 is projected onto the windshield 2 by the projection unit (the plane mirror 30 and the concave mirror 40), and is viewed by the windshield 2.
- the first screen 23 is not necessarily disposed at the position of the first projection distance P1, but may be in the vicinity of the position of the first projection distance P1. Specifically, the first screen 23 only needs to be provided within the focal depth Q with the first projection distance P1 as the center and can generate the first image M1 that is substantially in focus.
- the second screen 24 is a transmissive screen having a flat surface or a curved surface.
- the second screen 24 includes, for example, a holographic diffuser, a microlens array, a diffusing plate, and the like.
- the second projection light L2 which is disposed along the optical axis of the projection light L2 by a second projection distance P2 that is shorter than the first projection distance P1, is emitted from the projector 20 on the back surface, and is projected on the front side.
- Two images M2 are displayed.
- the second display light N2 indicating the second image M2 is projected onto the windshield 2 by a plane mirror 30 and a concave mirror 40, which will be described later, and viewed from the viewer E.
- the second virtual image V2 is displayed on the other side of 2.
- the second screen 24 is not necessarily disposed at the position of the second projection distance P2, but may be in the vicinity of the position of the second projection distance P2.
- the second screen 24 only needs to be provided within the focal depth Q centered on the second projection distance P2, and can generate the second image M2 that is substantially in focus.
- the first screen 23 is arranged farther from the projector 20 than the second screen 24. That is, the optical path length of the first display light N1 traveling from the first screen 23 toward the viewer E is shorter than the optical path length of the second display light N2 traveling from the second screen 24 toward the viewer E. . Therefore, the distance (display distance) from the viewer E to the position where the first virtual image V1 is displayed is shorter than the distance (display distance) from the viewer E to the position where the second virtual image V2 is displayed.
- the HUD 1 in the present embodiment can be displayed so that the first virtual image V1 is at a position closer to the second virtual image V2. In the present embodiment, the display distance of the first virtual image V1 is 2 m, and the display distance of the second virtual image V2 is 5 m.
- the first screen 23 has a normal direction with respect to the optical axis of the first display light N1 directed toward the eye box 3 via the projection unit (plane mirror 30, concave mirror 40) and the transmission reflection unit (front glass 2).
- the second screen 24 is also arranged so that the normal direction of the second screen 24 is the second direction toward the eye box 3 through the projection part (plane mirror 30, concave mirror 40) and the transmission / reflection part (windshield 2). It arrange
- the first screen 23 and / or the second screen 24 may be arranged such that the normal direction has a predetermined angle with respect to the optical axis of the first display light N1 and / or the second display light N2. Good. In such a case, the 1st virtual image V1 and / or the 2nd virtual image V2 which HUD1 produces
- the projection distance shortening unit 25 is composed of a single single-convex lens or biconvex lens having a positive refractive power, and is disposed on the path of the second projection light L2 between the first projection distance P1 and the branch point 28.
- the projection distance P of the two projection light L2 is adjusted to the second projection distance P2 shortened from the first projection distance P1.
- the second projection light L2 displays (forms) an in-focus second image M2 on the second screen 24 disposed closer to the projector 20 than the first screen 23.
- the first projection light L1 having the first projection distance P1 causes the first image M1 focused on the first screen 23 located far from the projector 20 without reducing the resolution.
- the second projection light L2 which was initially displayed and had the first projection distance P1, is a second screen positioned closer to the projector 20 than the first screen 23 by the action of the projection distance shortening unit 25. 24, it is possible to display the focused second image M2 with high resolution.
- the projection distance shortening unit 25 may be configured by a lens group having negative refractive power as a whole by combining one or a plurality of single-convex lenses, biconvex lenses, single-concave lenses, and biconcave lenses.
- the light distribution adjustment unit 29 is an optical system having a negative refractive power, and includes, for example, a single concave lens or a lens group including a single or a plurality of concave lenses, and includes a projection distance shortening unit 25 to a second screen 24. It is arranged on the path of the second projection light L2 between.
- the light distribution adjusting unit 29 refracts the optical axis of each imaging light beam 27 emitted from each pixel of the second display region 202 on the display device 200 and emits it to the second screen 24.
- the imaging light beam 27 (second projection light L2) emitted from each pixel of the display device 200 is adjusted in the convergence direction by the projection distance shortening unit 25, it is emitted from each pixel of the second screen 24.
- the second display light N2 can be corrected in the direction of divergence, and even when the projection distance shortening unit 25 is used, the second display light N2 emitted from the second screen 24 is appropriately applied to the eye box 3 of the viewer E. Can be directed.
- FIG. 4 is a diagram showing a schematic configuration of the HUD 1a in the second embodiment
- FIG. 5 shows the arrangement of optical members and the first projection light L1 (imaging light beam 26) in the display device 10a of the second embodiment
- FIG. 6 is a diagram illustrating an optical path of the second projection light L2 (imaging light beam 27).
- the display device 10a of the second embodiment is different from the first embodiment in that the projection distance shortening unit 25a is configured by a reflection curved surface 222 on the second fold mirror 22a.
- the second fold mirror 22a of the second embodiment is disposed farther from the projector 20 than the branch point 28 where the first projection light L1 and the second projection light L2 diverge, and refracts to reflect the first projection light L1. It includes at least a reflection plane 221 having no force and a concave reflection curved surface 222 having a positive refractive power for reflecting the second projection light L2 and functioning as the projection distance shortening portion 25a.
- the reflection curved surface 222 (projection distance shortening unit 25a) is formed of a convex free-form surface having a positive refractive power, and the first projection in which the projection distance P of the second projection light L2 is adjusted by the imaging unit 204.
- the distance P1 is adjusted to the shortened second projection distance P2.
- the second projection light L2 displays (forms an image) the second image M2 in a focused state on the second screen 24 disposed near the projector 20 from the first screen 23.
- a plurality of second fold mirrors 22a may be provided between the first fold mirror 21 and the second screen 24, and the negative refractive power required to extend the projection distance P of the second projection light L2. May be constituted by the refractive power of the plurality of second fold mirrors 22a. Further, the second fold mirror 22 may be provided by being divided into a fold mirror that receives the first projection light L1 and a fold mirror that receives the second projection light L2.
- the projection distance shortening unit 25 may be configured by combining the refractive optical system as shown in the first embodiment and the reflective optical system as shown in the second embodiment.
- the display device 10 includes the projector 20 that emits the projection light L having the first projection distance P1, and the first projection distance from the projector 20 along the projection light L.
- a first screen 23 arranged to be spaced apart from P1 and receiving the first projection light L1 of the projection light L and displaying the first image M1, and the distance along the projection light L from the projector 20 is the first screen.
- a second screen 24 that receives the second projection light L2 that is different from the first projection light L1 out of the projection light L and displays the second image M2, and has a positive refraction.
- the second projection light L2 is disposed on the path of the second projection light L2 between the projector 20 and the second screen 24, and the projection distance P of the second projection light L2 is shorter than the initial first projection distance P1. 2 is provided with a projection distance shortening unit 25 that shortens the projection distance P2.
- the optical path of the first projection light L1 from the first screen 23 to the first screen 23 is emitted from one projector 20 because no optical member having a negative refractive power is disposed on the projector 20 side of the second screen 24. With the projection light L, it is possible to display a plurality of images at different positions in the depth direction while suppressing a decrease in resolution.
- the display device 10 of the present embodiment sends the first projection light L1 and the second projection light L2 to the first screen 23 and the first projection on the path of the projection light L between the projector 20 and the first screen 23.
- a reflection part (second fold mirror 22 a) that reflects toward each of the two screens 24 is further provided, and the second fold mirror 22 a reflects the first projection light L 1 toward the first screen 23. 1 reflection surface) and a reflection curved surface 222 (second reflection surface) that reflects the second projection light L2 toward the second screen 24, and the projection distance shortening portion 25a is formed as the reflection curved surface 222.
- the projection distance P of a part of the projection light L (second projection light L2) can be shortened by the second fold mirror 22a, the projection light L is turned back and the optical path of the projection light L is made compact.
- the first image M1 and the second image M2 can be formed on the first screen 23 and the second screen 24 having different projection distances P, respectively.
- the second fold mirror 22a of the second embodiment since the second fold mirror 22a of the second embodiment is provided so that the first projection light L1 and the second projection light L2 can be reflected on the same plane, the second fold mirror 22a receives the first projection light L1 and receives the projection distance P. Relative to the first reflection surface 221 that reflects toward the first screen 23 having a long projection length and the second reflection surface 222 that receives the second projection light L2 and reflects toward the second screen 24 having a short projection distance P. Thus, the positional accuracy of the image is improved, and it is possible to reduce the focus shift of the image displayed on each screen due to an assembling error and the variation of the projection position.
- the light distribution adjustment unit 29 having a negative refractive power is disposed on the optical path of the second projection light L2 from the projection distance shortening unit 25 to the second screen 24.
- the present invention can be used, for example, as a display device or a head-up display mounted on a vehicle.
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Abstract
Description
HUD1は、例えば自動車に搭載されるものであり、図1に示すように、表示装置10と、平面鏡(投射部)30と、凹面鏡(投射部)40と、筐体50と、制御基板(図示しない)と、を備える。HUD1は、表示装置10が表示する第1画像M1の第1表示光N1と、第2画像M2の第2表示光N2とを、平面鏡30と凹面鏡40とで車両のフロントガラス(透過反射部の一例)2に向けて反射することで、視認者Eに対して第1画像M1の第1虚像V1と、第2画像M2の第2虚像V2とを表示する。後に詳述するが、表示装置10は、視認者Eの視点に到達するまでの第1表示光N1の距離が、第2表示光N2の距離よりも短くなるように、第1画像M1及び第2画像M2を表示する。これにより、視認者Eは、第1画像M1に基づく第1虚像V1を、第2画像M2に基づく第2虚像V2よりも近い位置に視認する。
筐体50は、表示光N(第1表示光N1、第2表示光N2)をフロントガラス2に通過させる開口部50aを有し、この開口部50aは、透光性カバー50bに覆われている。
表示装置10は、図1に示すように、投影光Lを出射する投影器20と、この投影器20からの投影光Lを反射して折り返す第1フォールドミラー21と、第1フォールドミラー21からの投影光Lを反射して折り返す第2フォールドミラー22と、投影光Lのうち第1投影光L1を裏面で受光し、表面に第1投影光L1が結像した第1画像M1を表示する第1スクリーン23と、投影光Lのうち第2投影光L2を裏面で受光し、表面に第2投影光L2が結像した第2画像M2を表示する第2スクリーン24と、投影器20と第2スクリーン24との間の前記第2投影光L2の経路上に配置され、第2投影光L2の投影距離Pを短くする投影距離短縮部25と、を備える。
なお、投影器20から第2フォールドミラー22までの間に第1フォールドミラー21を複数設けてもよく、また第1フォールドミラー21を省略してもよい。また、第1フォールドミラー21は、分岐点28よりも投影器20から離れて配置されてもよい。このように第1フォールドミラー21が分岐点28よりも投影器20から離れて配置される場合、第1フォールドミラー21は、第1投影光L1を受光するフォールドミラーと、第2投影光L2を受光するフォールドミラーとで分割して設けられていてもよい。
なお、第1フォールドミラー21から第1スクリーン23までの間に第2フォールドミラー22を複数設けてもよく、また第2フォールドミラー22を省略してもよい。また、第2フォールドミラー22は、分岐点28よりも投影器20から離れて配置されてもよい。このように第2フォールドミラー22が分岐点28よりも投影器20から離れて配置される場合、第2フォールドミラー22は、第1投影光L1を受光するフォールドミラーと、第2投影光L2を受光するフォールドミラーとで分割して設けられていてもよい。
なお、投影距離短縮部25は、単数または複数の片凸レンズ、両凸レンズ、片凹レンズ、両凹レンズを組み合わせて全体として負の屈折力を有するレンズ群で構成されてもよい。
以下に、図4,図5を用いて、本発明の表示装置及びヘッドアップディスプレイの第2実施形態を説明する。なお、第1実施形態と同じ構成については、同じ符号を付し、細かい説明は省略する。
図4は、第2実施形態におけるHUD1aの概略的な構成を示す図であり、図5は、第2実施形態の表示装置10aにおける光学部材の配置と、第1投影光L1(結像光束26)、第2投影光L2(結像光束27)の光路を説明する図である。
第2実施形態の表示装置10aは、投影距離短縮部25aが第2フォールドミラー22a上の反射曲面222で構成されている点で第1実施形態と異なる。
2 フロントガラス(透過反射部)
10、10a 表示装置
20 投影器
21 第1フォールドミラー(反射部)
22、22a 第2フォールドミラー(反射部)
23 第1スクリーン
24 第2スクリーン
25、25a 投影距離延長部
26 結像光束
27 結像光束
28 分岐部
29 配光調整部
30 平面鏡(投射部)
40 凹面鏡(投射部)
200 表示器
201 第1表示領域
201a 画素
202 第2表示領域
202a 画素
203 第3表示領域
204 結像部
221 反射平面(第1反射面)
222 反射曲面(第2反射面)
E 視認者
L 投影光
L1 第1投影光
L2 第2投影光
M 画像
M1 第1画像
M2 第2画像
N 表示光
N1 第1表示光
N2 第2表示光
P 投影距離
P1 第1投影距離
P2 第2投影距離
V1 第1虚像
V2 第2虚像
Claims (8)
- 第1の投影距離を有する投影光を出射する投影器と、
前記投影光に沿って前記投影器から前記第1の投影距離を隔てて配置され、前記投影光のうち第1投影光を受光し、第1画像を表示する第1スクリーンと、
前記投影器からの前記投影光に沿った距離が前記第1スクリーンよりも短くなる位置に配置され、前記投影光のうち前記第1投影光と異なる第2投影光を受光し、第2画像を表示する第2スクリーンと、を備え、
正の屈折力を有し、前記投影器と前記第2スクリーンとの間の前記第2投影光の経路上に配置され、前記第2投影光の投影距離を短くする投影距離短縮部を備える、
ことを特徴とする表示装置。 - 前記投影器と前記第1スクリーンとの間の前記投影光の経路上に、前記第1投影光と前記第2投影光とを前記第1スクリーンと前記第2スクリーンとにそれぞれ向けて反射する反射部をさらに備え、
前記反射部は、前記第1投影光を前記第1スクリーンに向けて反射する第1反射面と、前記第2投影光を前記第2スクリーンに向けて反射する第2反射面と、を備え、
前記投影距離短縮部は、前記第2反射面に形成される、
ことを特徴とする請求項1に記載の表示装置。 - 前記反射部は、前記第1投影光と前記第2投影光とを同一面上で反射可能に設けられる、
ことを特徴とする請求項2に記載の表示装置。 - 前記投影距離短縮部から前記第2スクリーンまでの前記第2投影光の光路上に、負の屈折力を有する配光調整部を配置する、
ことを特徴とする請求項1乃至3のいずれかに記載の表示装置。 - 第1の投影距離を有する投影光を出射する投影器と、
前記投影光に沿って前記投影器から前記第1の投影距離を隔てて配置され、前記投影光のうち第1投影光を受光し、第1画像を表示する第1スクリーンと、
前記投影器からの前記投影光に沿った距離が前記第1スクリーンよりも短くなるように配置され、前記投影光のうち前記第1投影光と異なる第2投影光を受光し、第2画像を表示する第2スクリーンと、
正の屈折力を有し、前記投影器と前記第2スクリーンとの間の前記第2投影光の経路上に配置され、前記第2投影光の投影距離を短くする投影距離短縮部と、
前記第1スクリーンに表示された前記第1画像と前記第2スクリーンに表示された前記第2画像とを視認者の前方に位置する透過反射部に向けて投射し、前記視認者に前記透過反射部を介して前記第1画像と前記第2画像とに基づく虚像を視認させる投射部と、を備え、
前記第1スクリーンは、前記視認者に向かう前記第1画像に基づく光の光路が、前記第2画像に基づく光の光路よりも短くなるように配置される、
ことを特徴とするヘッドアップディスプレイ。 - 前記投影器と前記第1スクリーンとの間の前記投影光の経路上に、前記第1投影光と前記第2投影光とを前記第1スクリーンと前記第2スクリーンとにそれぞれ向けて反射する反射部をさらに備え、
前記反射部は、前記第1投影光を前記第1スクリーンに向けて反射する第1反射面と、前記第2投影光を前記第2スクリーンに向けて反射する第2反射面と、を備え、
前記投影距離短縮部は、前記第2反射面に形成される、
ことを特徴とする請求項5に記載のヘッドアップディスプレイ。 - 前記反射部は、前記第1投影光と前記第2投影光とを同一面上で反射可能に設けられる、
ことを特徴とする請求項6に記載のヘッドアップディスプレイ。 - 前記投影距離短縮部から前記第2スクリーンまでの前記第2投影光の光路上に、負の屈折力を有する配光調整部を配置する、
ことを特徴とする請求項5乃至7のいずれかに記載のヘッドアップディスプレイ。
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