WO2018230509A1 - 走査型表示装置、走査型表示システム、及び光拡散部の製造方法 - Google Patents
走査型表示装置、走査型表示システム、及び光拡散部の製造方法 Download PDFInfo
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- WO2018230509A1 WO2018230509A1 PCT/JP2018/022256 JP2018022256W WO2018230509A1 WO 2018230509 A1 WO2018230509 A1 WO 2018230509A1 JP 2018022256 W JP2018022256 W JP 2018022256W WO 2018230509 A1 WO2018230509 A1 WO 2018230509A1
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- light
- eye
- unit
- light diffusion
- scanning
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- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 143
- 238000009792 diffusion process Methods 0.000 claims abstract description 106
- 230000004304 visual acuity Effects 0.000 description 53
- 210000001525 retina Anatomy 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000001427 coherent effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 206010047531 Visual acuity reduced Diseases 0.000 description 1
- 210000000695 crystalline len Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004315 low visual acuity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- 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
- G02B27/48—Laser speckle optics
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B5/02—Diffusing elements; Afocal elements
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- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
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- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
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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
- 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
- B60K2360/23—Optical features of instruments using reflectors
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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
- 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
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- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0145—Head-up displays characterised by optical features creating an intermediate image
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- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0147—Head-up displays characterised by optical features comprising a device modifying the resolution of the displayed image
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- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
Definitions
- the present disclosure relates to a scanning display device, a scanning display system, and a method of manufacturing a light diffusion unit.
- a scanning display device comprising: a light source that emits laser light for projection display; an optical scanning unit that scans the laser light emitted from the light source; and a light diffusion unit that diffuses the laser light scanned by the optical scanning unit Is known (see, for example, Patent Document 1).
- the light diffusing section for example, an optical element having a plurality of light diffusing channels arranged two-dimensionally, such as a transmissive microlens array, is used.
- the displayed image has uneven luminance regardless of the size (beam diameter) of the laser light in the light diffusion portion (In some cases, irregular luminance irregularities (speckles, regular luminance irregularities are included).
- a scanning display device includes a light source that emits laser light for projection display, an optical scanning unit that scans laser light emitted from the light source, and a plurality of light diffusion channels arranged in two dimensions
- the angle formed by the optical path to the person's eye is configured to be equal to or greater than the angle set based on the resolution angle of the eye.
- an angle formed by an optical path reaching an observer's eye through an arbitrary pair of light diffusion channels can be set to, for example, an eye resolution angle or more. Therefore, according to this scanning display device, the displayed image has uneven luminance in an eye that is in the assumed position and has the assumed visual acuity, regardless of the size (beam diameter) of the laser light in the light diffusion portion. It can be suppressed from occurring.
- the light diffusion unit may be configured such that the angle formed by the optical path is 1 minute or more. According to this, since the resolving angle of an eye having a visual acuity of 1.0 is 1 minute, the visual acuity is set to an angle formed by an optical path reaching an observer's eye through an arbitrary pair of light diffusion channels. It can be greater than or equal to the eye resolution angle of zero. Therefore, it is possible to suppress uneven brightness in the displayed image for an eye having a visual acuity of 1.0 or more.
- the light diffusing unit may be configured such that the angle formed by the optical path is 1.42 minutes or more.
- the visual acuity is an angle formed by an optical path reaching an observer's eye through an arbitrary pair of light diffusion channels. It can be greater than or equal to the eye resolution angle of 0.7. Therefore, it is possible to suppress uneven brightness in the displayed image for an eye having a visual acuity of 0.7 or more.
- the resolution angle is ⁇
- the arrangement pitch of the plurality of light diffusion channels is P
- the magnification of the optical system disposed between the light diffusion unit and the eye is M.
- the light diffusing unit may be configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M. According to this, even if an optical system is arranged between the light diffusing unit and the eye, it is ensured that unevenness in luminance occurs in the displayed image for the eye that is in the assumed position and has the assumed visual acuity. Can be suppressed.
- the light diffusing unit when the optical path directly reaches the eye from the light diffusion unit, the resolution angle is ⁇ , the arrangement pitch of the plurality of light diffusion channels is P, and the light diffusion unit to the eye If the distance up to is L, the light diffusing unit may be configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L). According to this, when an optical system is not arranged between the light diffusing unit and the eyes, it is ensured that unevenness in luminance occurs in the displayed image for an eye that is in the assumed position and has the assumed visual acuity. Can be suppressed.
- the arrangement pitch of the plurality of light diffusion channels may be random. According to this, it is possible to more reliably suppress the occurrence of luminance unevenness in the displayed image for an eye that is in the assumed position and has the assumed visual acuity.
- the light diffusion unit may be a transmissive microlens array. According to this, it is possible to reliably and easily realize the diffusion of the laser light by the plurality of light diffusion channels arranged in two dimensions.
- a scanning display system includes a light source that emits laser light for projection display, an optical scanning unit that scans laser light emitted from the light source, and a plurality of light diffusion channels arranged in two dimensions
- the angle formed by the optical path to the person's eye is configured to be equal to or greater than the angle set based on the resolution angle of the eye.
- this scanning display system it is possible to suppress the occurrence of uneven brightness in the displayed image for an eye that is in the assumed position and has the assumed visual acuity, regardless of the size of the laser light in the light diffusion unit. Can do.
- the light diffusing unit may be configured such that the angle formed by the optical path is 1 minute or more. According to this, since the resolving angle of an eye having a visual acuity of 1.0 is 1 minute, the visual acuity is set to an angle formed by an optical path reaching an observer's eye through an arbitrary pair of light diffusion channels. It can be greater than or equal to the eye resolution angle of zero. Therefore, it is possible to suppress uneven brightness in the displayed image for an eye having a visual acuity of 1.0 or more.
- the light diffusing unit may be configured such that the angle formed by the optical path is 1.42 minutes or more.
- the visual acuity is an angle formed by an optical path reaching an observer's eye through an arbitrary pair of light diffusion channels. It can be greater than or equal to the eye resolution angle of 0.7. Therefore, it is possible to suppress uneven brightness in the displayed image for an eye having a visual acuity of 0.7 or more.
- a scanning display system further includes an optical system disposed at a subsequent stage of the light diffusion unit, a resolution angle is ⁇ , an arrangement pitch of a plurality of light diffusion channels is P, and a magnification of the optical system
- the light diffusing unit may be configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M. According to this, even if an optical system is arranged between the light diffusing unit and the eye, it is ensured that unevenness in luminance occurs in the displayed image for the eye that is in the assumed position and has the assumed visual acuity. Can be suppressed.
- the resolution angle is ⁇
- the arrangement pitch of the plurality of light diffusion channels is P
- the light diffusing unit may be configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L). According to this, when an optical system is not arranged between the light diffusing unit and the eyes, it is ensured that unevenness in luminance occurs in the displayed image for an eye that is in the assumed position and has the assumed visual acuity. Can be suppressed.
- the arrangement pitch of the plurality of light diffusion channels may be random. According to this, it is possible to more reliably suppress the occurrence of luminance unevenness in the displayed image for an eye that is in the assumed position and has the assumed visual acuity.
- a method of manufacturing a light diffusing unit includes a light source that emits laser light for projection display, an optical scanning unit that scans laser light emitted from the light source, and a plurality of light beams that are two-dimensionally arranged.
- a method of manufacturing a light diffusing unit includes a resolution angle ⁇ , an arrangement pitch of a plurality of light diffusing channels as P, and a magnification of an optical system disposed between the light diffusing unit and the eye. If M is M and the distance from the light diffusion part to the eye is L, the light diffusion part may be manufactured so as to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M. According to this, even if an optical system is arranged between the light diffusing unit and the eye, it is ensured that unevenness in luminance occurs in the displayed image for the eye that is in the assumed position and has the assumed visual acuity. It is possible to obtain a light diffusing portion that can be suppressed.
- the light diffusion part may be manufactured so as to satisfy ⁇ ⁇ tan ⁇ 1 (P / L). According to this, when an optical system is not arranged between the light diffusing unit and the eyes, it is ensured that unevenness in luminance occurs in the displayed image for an eye that is in the assumed position and has the assumed visual acuity. It is possible to obtain a light diffusing portion that can be suppressed.
- a scanning display device a scanning display system, and a method of manufacturing a light diffusing unit used in the display image, which can suppress uneven brightness in a displayed image. It becomes.
- FIG. 1 is a configuration diagram of a scanning display device and a scanning display system according to an embodiment.
- FIG. 2 is a diagram illustrating an optical path from the optical scanning unit to the eye via the light diffusion unit.
- FIG. 3 is a diagram illustrating a state of light incident on the eye.
- FIG. 4 is a diagram illustrating an optical path from the optical scanning unit to the eye through the light diffusion unit.
- the scanning display system 10 is, for example, a laser scanning projection display mounted on an automobile, and displays (projects and displays) an image on a windshield 100 of the automobile.
- the scanning display system 10 includes a scanning display device 1 and an optical system 11.
- the optical system 11 includes a plurality of plane mirrors 11a and 11b, a concave mirror 11c, and a windshield 100.
- the windshield 100 functions as the last optical element in the optical system 11.
- the projection display light L2 emitted from the scanning display device 1 is sequentially reflected by the plane mirror 11a, the plane mirror 11b, the concave mirror 11c, and the windshield 100 and enters the eye E of the observer.
- the scanning display device 1 includes a light source 2, an optical scanning unit 3, a light diffusion unit 4, and a control unit 5.
- the light source 2 emits laser light L1 for projection display. More specifically, the light source 2 has a plurality of light emitting portions 2a.
- the plurality of light emitting portions 2a are a red laser diode, a green laser diode, and a blue laser diode, respectively.
- Each light emitting unit 2a emits laser light L1 having a visible wavelength.
- the laser light L1 emitted from each light emitting unit 2a is reflected by a plurality of mirrors 2b including a dichroic mirror, travels on the same optical path, and enters the optical scanning unit 3.
- the light scanning unit 3 scans the laser light L1 emitted from the light source 2. More specifically, the optical scanning unit 3 is a MEMS mirror that reflects and scans the laser light L1 emitted from the light source 2.
- the MEMS mirror is a driving mirror manufactured by MEMS (Micro Electro Mechanical Systems) technology, and there are an electromagnetic driving type, an electrostatic driving type, a piezoelectric driving type, a thermal driving type, and the like.
- the mirror 3a of the optical scanning unit 3 can be swung around two axes orthogonal to each other, and can be swung at a resonance frequency level at high speed around one axis.
- the optical scanning unit 3 that is a MEMS mirror scans the light diffusion unit 4 with the laser light L1.
- the light diffusing unit 4 has a plurality of light diffusing channels 4a arranged two-dimensionally, and diffuses the laser light L1 scanned by the light scanning unit 3. More specifically, the light diffusing unit 4 is a transmissive microlens array. That is, the light diffusing unit 4 transmits and diffuses the laser light L1 scanned by the light scanning unit 3.
- the light diffusion channel 4a is, for example, each of a plurality of microlenses arranged in a matrix.
- the light incident surface of the light diffusing unit 4 includes a plurality of convex surfaces corresponding to a plurality of microlenses.
- the light emitting surface of the light diffusing unit 4 is a flat surface.
- the control unit 5 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and controls the operation of the scanning display device 1.
- the control unit 5 when receiving the projection display start input signal, the control unit 5 starts the output of each light emitting unit 2 a of the light source 2. Thereby, the laser beam L1 is emitted from the light source 2.
- the control unit 5 starts the operation of the optical scanning unit 3.
- the mirror 3 a starts to swing, and the laser beam L ⁇ b> 1 emitted from the light source 2 is scanned with respect to the light diffusion unit 4.
- the control unit 5 changes the ratio of the laser light L1 emitted from each light emitting unit 2a according to the scanning position of the laser light L1 in the light diffusion unit 4.
- the light L2 for projection display that is, the light constituting the image among the laser light L1 diffused by the light diffusing unit 4
- FIG. 2 is a diagram illustrating an optical path from the light scanning unit 3 to the eye E via the light diffusion unit 4.
- FIG. 3 is a diagram illustrating a state of the light L2 incident on the eye.
- the optical scanning unit 3, the light diffusion unit 4, and the eye E are shown in a straight line, and the optical system 11 is not shown.
- the laser light L1 reflected by the optical scanning unit 3 is adjacent to each other among the plurality of light diffusion channels 4a (specifically, in the horizontal scanning direction and the vertical scanning direction of the laser light L1).
- the laser light L1 reflected by the optical scanning unit 3 is adjacent to each other among the plurality of light diffusion channels 4a (specifically, in the horizontal scanning direction and the vertical scanning direction of the laser light L1).
- a part of the light L2 diffused in one light diffusion channel 4a enters the eye E through the optical path A
- the other light diffusion channel Part of the light L2 diffused by 4a enters the eye E through the optical path B.
- the light L2 incident on the eye E is collected on the retina R by the crystalline lens C.
- the condensing size of the light L2 on the retina R depends on the visual acuity of the eye E. Since the visual acuity of the eye E shown in (a) of FIG. 3 is lower than the visual acuity of the eye E shown in (b) of FIG. 3, the condensing size of the light L2 on the retina R is increased, and the optical path A Light L2 incident on the eye E through the light path L2 and light L2 incident on the eye E through the optical path B overlap on the retina R. On the other hand, the visual acuity of the eye E shown in (b) of FIG. 3 is higher than the visual acuity of the eye E shown in (a) of FIG.
- the light L2 incident on the eye E through the optical path A and the light L2 incident on the eye E through the optical path B do not overlap on the retina R. Since a phase difference occurs between the light L2 incident on the eye E through the optical path A and the light L2 incident on the eye E through the optical path B, as shown in FIG.
- the light L2 incident on the eye E through the light L2 and the light L2 incident on the eye E through the optical path B overlap on the retina R, interference may occur, and uneven brightness may occur in the displayed image.
- the minimum angle at which the light L2 incident on the eye E through the optical path A and the light L2 incident on the eye E through the optical path B can be separated on the retina R is referred to as the resolution angle of the eye E.
- the resolution angle of the eye E For example, as shown in FIG. 3A, when the eye E has a low visual acuity, the condensing size of the light L2 on the retina R increases, so the resolution angle increases.
- the resolution angle is 1 minute
- the resolution angle is 1.42 minutes
- the resolution angle is 2 minutes. It is said.
- the light diffusing unit 4 is configured such that the angle ⁇ formed by the optical paths A and B is equal to or larger than the resolution angle of the eye E. ing.
- the arrangement pitch of the plurality of light diffusion channels 4a (the plurality of light diffusion channels 4a are two-dimensionally arranged so that the angle ⁇ formed by the optical paths A and B is equal to or larger than the resolution angle of the eye E.
- the distance between the vertices of the light diffusion channels 4a adjacent to each other in the direction ") is set.
- the angle ⁇ formed by the optical paths A and B is from the last stage optical element (here, the windshield 100) in the optical system 11 via an arbitrary pair of light diffusion channels 4a and 4a adjacent to each other to the eyes E of the observer. Is the angle ⁇ formed by the optical paths A and B.
- the light diffusion unit 4 is set so that the angle ⁇ formed by the optical paths A and B is 1 minute or more. Is configured. Further, when the assumed eye E has a visual acuity of 0.7, the resolution angle is 1.42 minutes, so that the angle ⁇ formed by the optical paths A and B is 1.42 minutes or more.
- a diffusion unit 4 is configured.
- the arrangement pitch of the plurality of light diffusing channels 4a is “adjacent to each other (at least adjacent to each other in the scanning direction of the laser light L1). The distance between the vertices ", and the vertex of the light diffusion channel 4a is the vertex of the microlens.
- FIG. 4 is a diagram illustrating an optical path from the light scanning unit 3 to the eye E via the light diffusion unit 4.
- the light scanning unit 3, the light diffusion unit 4, the optical system 11, and the eye E are shown in a straight line, and in particular, the optical system 11 is shown in a simplified manner.
- the optical system 11 includes a plurality of optical elements (here, the plane mirror 11 a, the plane mirror 11 b, the concave mirror 11 c, and the windshield 100) as a light diffusion that is a primary image plane. It has a function of enlarging the image in the section 4.
- the optical system 11 is arranged at the rear stage of the light diffusing unit 4, the light L2 enters the eye E through optical paths A and B from any pair of adjacent light diffusing channels 4a and 4a.
- the magnification of the optical system 11 is “the angle formed by the optical paths A and B” / “the angle formed by the optical paths A ′ and B ′ (the optical path when the optical system 11 is not provided)”.
- the assumed resolution angle of the eye E is ⁇
- the arrangement pitch of the plurality of light diffusion channels 4a is P
- the magnification of the optical system 11 disposed between the light diffusion unit 4 and the eye E (“FOV: If the field of view (magnification of field of view) is M, and the distance from the light diffusing unit 4 to the eye E (the length of the optical path from the light diffusing unit 4 to the eye E via the optical system 11) is L, If the light diffusing unit 4 is configured so as to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M, the luminance unevenness of the displayed image of the eye E at the assumed position and having the assumed visual acuity Does not occur.
- the angle ⁇ formed by the optical paths A and B is greater than or equal to the resolution angle of the eye E. So that ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M when the optical system 11 is present, or ⁇ ⁇ tan ⁇ 1 (P / L) when there is no optical system 11
- the light diffusion part 4 can be manufactured.
- the scanning display device 1 (and the scanning display system 10), the angles formed by the optical paths A and B that reach the observer's eye E through any pair of light diffusion channels 4a and 4a.
- ⁇ can be set to be equal to or larger than the resolution angle of the eye E. Therefore, according to the scanning display device 1, the displayed image of the eye E at the assumed position and having the assumed visual acuity is independent of the size (beam diameter) of the laser light L1 in the light diffusing unit 4. The occurrence of uneven brightness can be suppressed.
- the light diffusing unit 4 is configured such that the angle ⁇ formed by the optical paths A and B is 1 minute or more. Thereby, the angle ⁇ formed by the optical paths A and B can be set to be equal to or larger than the resolution angle of the eye E whose visual acuity is 1.0. Therefore, it is possible to suppress uneven brightness in the displayed image for the eye E having a visual acuity of 1.0 or more.
- the light diffusing unit 4 may be configured so that the angle ⁇ formed by the optical paths A and B is 1.42 minutes or more. Thereby, the angle ⁇ formed by the optical paths A and B can be set to be equal to or larger than the resolution angle of the eye E whose visual acuity is 0.7. Therefore, it is possible to suppress uneven brightness in the displayed image for the eye E having a visual acuity of 0.7 or more.
- the assumed resolution angle of the eye E is ⁇
- the arrangement pitch of the plurality of light diffusion channels 4 a is P
- the optical system disposed between the light diffusion unit 4 and the eye E When the magnification of 11 is M and the distance from the light diffusing unit 4 to the eye E is L, the light diffusing unit 4 is configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M. Thereby, even if the optical system 11 is arranged between the light diffusing unit 4 and the eye E, brightness unevenness occurs in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity. Can be reliably suppressed.
- the light diffusing unit 4 is a transmissive microlens array. Thereby, the diffusion of the laser light L1 by the plurality of light diffusion channels 4a arranged two-dimensionally can be realized reliably and easily.
- the assumed resolution angle of the eye E is ⁇
- the arrangement pitch of the plurality of light diffusion channels 4 a is P
- the optical system disposed between the light diffusion unit 4 and the eye E When the magnification of 11 is M and the distance from the light diffusing unit 4 to the eye E is L, the light diffusing unit 4 is configured to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M. Thereby, even if the optical system 11 is arranged between the light diffusing unit 4 and the eye E, brightness unevenness occurs in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity. Can be reliably suppressed.
- the light diffusing unit 4 is manufactured so that the angle ⁇ formed by the optical paths A and B is not less than the resolution angle of the eye E. Thereby, regardless of the size of the laser beam L1 in the light diffusing unit 4, the light diffusing unit that can suppress uneven brightness in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity. 4 can be obtained.
- the assumed resolution angle of the eye E is ⁇
- the arrangement pitch of the plurality of light diffusing channels 4 a is P
- the light diffusing unit 4 is disposed between the light diffusing unit 4 and the eye E.
- the magnification of the optical system 11 is M and the distance from the light diffusing unit 4 to the eye is L
- the light diffusing unit 4 is manufactured so as to satisfy ⁇ ⁇ tan ⁇ 1 (P / L) ⁇ M.
- this indication is not limited to one embodiment mentioned above.
- the light source 2 is not limited to a laser diode (semiconductor laser) as long as it can emit coherent light (laser light), and may be a surface emitting laser, an SLD (super luminescent diode), or the like. May be.
- the optical scanning unit 3 is not limited to a MEMS mirror as long as it can scan a laser beam, and may be a galvanometer mirror or the like.
- the light diffusing unit 4 is not limited to transmitting and diffusing laser light, and may be one that reflects and diffuses laser light.
- the light diffusing unit 4 is not limited to a transmissive microlens array as long as it has a plurality of light diffusing channels 4a arranged two-dimensionally, but a reflective microlens array, micromirror array, diffraction It may be a grating, a fiber optic plate, or the like.
- the light diffusing unit 4 is a transmissive microlens array
- the light incident surface of the light diffusing unit 4 is a flat surface
- the light diffusing unit 4 is formed by a plurality of convex surfaces corresponding to a plurality of microlenses.
- the light emission surface may be configured.
- a plurality of concave surfaces may be formed so as to correspond to the plurality of microlenses.
- the light diffusing unit 4 may be manufactured and configured so that the angle ⁇ formed by the optical paths A and B is equal to or larger than an angle set based on the resolution angle of the eye E.
- the light diffusing unit 4 may be manufactured such that the angle ⁇ formed by the optical paths A and B is equal to or greater than the resolution angle ⁇ ⁇ 0.1 minutes of the eye E. That is, the condition that the angle ⁇ formed by the optical paths A and B is not less than the resolution angle ⁇ of the eye E need not be satisfied in all the light diffusion channels 4a.
- the light diffusing unit 4 has an angle ⁇ formed by the optical paths A and B equal to or larger than a resolution angle ⁇ 1 of the eye E (resolution angle corresponding to an assumed upper limit of visual acuity) and a resolution angle ⁇ 2 of the eye E (assumed. It may be manufactured so as to be equal to or less than the resolution angle corresponding to the lower limit of visual acuity, and may be configured as such.
- a resolution angle ⁇ 1 of the eye E resolution angle corresponding to an assumed upper limit of visual acuity
- ⁇ 2 of the eye E assumed. It may be manufactured so as to be equal to or less than the resolution angle corresponding to the lower limit of visual acuity, and may be configured as such.
- the arrangement pitch of the plurality of light diffusion channels 4a is not necessarily constant, and may be random, for example. According to this, it is possible to more reliably suppress the occurrence of luminance unevenness in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity.
- Means for adjusting ⁇ may be provided in the optical system 11, for example.
- the magnification M of the optical system 11 and the distance L from the light diffusion unit 4 to the eye E can be adjusted.
- the optical system 11 does not have to be disposed after the light diffusing unit 4 (see FIG. 2). That is, the optical paths A and B may reach the eye E directly from the light diffusing unit 4.
- the arrangement pitch of the plurality of light diffusion channels 4a is P
- the distance from the light diffusion unit 4 to the eye E is L
- the light diffusing section 4 may be configured.
- the displayed image has uneven luminance in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity. It can suppress reliably that it arises.
- the resolution angle is ⁇
- the arrangement pitch of the plurality of light diffusing channels 4a is P
- the light diffusing unit 4 may be manufactured so as to satisfy ⁇ ⁇ tan ⁇ 1 (P / L).
- the displayed image has uneven luminance in the displayed image for the eye E that is in the assumed position and has the assumed visual acuity. It is possible to obtain the light diffusing unit 4 that can reliably suppress the occurrence.
- the above-described scanning display device 1 is not limited to the on-vehicle type, and can be used in various scenes such as a built-in helmet type and a glasses type.
- SYMBOLS 1 ... Scanning display apparatus, 2 ... Light source, 3 ... Optical scanning part, 4 ... Light diffusion part, 4a ... Light diffusion channel, 10 ... Scanning display system, 11 ... Optical system, L1 ... Laser beam.
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Abstract
Description
Claims (16)
- 投影表示用のレーザ光を出射する光源と、
前記光源から出射された前記レーザ光を走査する光走査部と、
二次元に配列された複数の光拡散チャネルを有し、前記光走査部によって走査された前記レーザ光を拡散させる光拡散部と、を備え、
前記光拡散部は、前記複数の光拡散チャネルのうち互いに隣り合う任意の一対の光拡散チャネルを介して観察者の眼に至る光路の成す角度が、前記眼の解像角に基づいて設定された角度以上となるように、構成されている、走査型表示装置。 - 前記光拡散部は、前記光路の成す角度が1分以上となるように、構成されている、請求項1に記載の走査型表示装置。
- 前記光拡散部は、前記光路の成す角度が1.42分以上となるように、構成されている、請求項2に記載の走査型表示装置。
- 前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光拡散部と前記眼との間に配置される光学系の倍率をMとし、前記光拡散部から前記眼までの距離をLとすると、前記光拡散部は、α≦tan-1(P/L)×Mを満たすように、構成されている、請求項1~3のいずれか一項に記載の走査型表示装置。
- 前記光路が前記光拡散部から前記眼に直接至る場合には、前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光拡散部から前記眼までの距離をLとすると、前記光拡散部は、α≦tan-1(P/L)を満たすように、構成されている、請求項1~3のいずれか一項に記載の走査型表示装置。
- 前記複数の光拡散チャネルの配列ピッチは、ランダムである、請求項1~5のいずれか一項に記載の走査型表示装置。
- 前記光拡散部は、透過型のマイクロレンズアレイである、請求項1~6のいずれか一項に記載の走査型表示装置。
- 投影表示用のレーザ光を出射する光源と、
前記光源から出射された前記レーザ光を走査する光走査部と、
二次元に配列された複数の光拡散チャネルを有し、前記光走査部によって走査された前記レーザ光を拡散させる光拡散部と、を備え、
前記光拡散部は、前記複数の光拡散チャネルのうち互いに隣り合う任意の一対の光拡散チャネルを介して観察者の眼に至る光路の成す角度が、前記眼の解像角に基づいて設定された角度以上となるように、構成されている、走査型表示システム。 - 前記光拡散部は、前記光路の成す角度が1分以上となるように、構成されている、請求項8に記載の走査型表示システム。
- 前記光拡散部は、前記光路の成す角度が1.42分以上となるように、構成されている、請求項9に記載の走査型表示システム。
- 前記光拡散部の後段に配置された光学系を更に備え、
前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光学系の倍率をMとし、前記光拡散部から前記眼までの距離をLとすると、前記光拡散部は、α≦tan-1(P/L)×Mを満たすように、構成されている、請求項8~10のいずれか一項に記載の走査型表示システム。 - 前記光路が前記光拡散部から前記眼に直接至る場合には、前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光拡散部から前記眼までの距離をLとすると、前記光拡散部は、α≦tan-1(P/L)を満たすように、構成されている、請求項8~10のいずれか一項に記載の走査型表示システム。
- 前記複数の光拡散チャネルの配列ピッチは、ランダムである、請求項8~12のいずれか一項に記載の走査型表示システム。
- 投影表示用のレーザ光を出射する光源と、
前記光源から出射された前記レーザ光を走査する光走査部と、
二次元に配列された複数の光拡散チャネルを有し、前記光走査部によって走査された前記レーザ光を拡散させる光拡散部と、を備える走査型表示装置に用いられる前記光拡散部を製造する方法であって、
前記複数の光拡散チャネルのうち互いに隣り合う任意の一対の光拡散チャネルを介して観察者の眼に至る光路の成す角度が、前記眼の解像角に基づいて設定された角度以上となるように、前記光拡散部を製造する、光拡散部の製造方法。 - 前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光拡散部と前記眼との間に配置される光学系の倍率をMとし、前記光拡散部から前記眼までの距離をLとすると、α≦tan-1(P/L)×Mを満たすように、前記光拡散部を製造する、請求項14に記載の光拡散部の製造方法。
- 前記光路が前記光拡散部から前記眼に直接至る場合には、前記解像角をαとし、前記複数の光拡散チャネルの配列ピッチをPとし、前記光拡散部から前記眼までの距離をLとすると、α≦tan-1(P/L)を満たすように、前記光拡散部を製造する、請求項14に記載の光拡散部の製造方法。
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US16/621,396 US11204497B2 (en) | 2017-06-13 | 2018-06-11 | Scanning-type display device, scanning-type display system, and method for manufacturing light-diffusing part |
CN201880039317.2A CN110741306B (zh) | 2017-06-13 | 2018-06-11 | 扫描型显示装置、扫描型显示***及光扩散部的制造方法 |
EP18818546.6A EP3640707A4 (en) | 2017-06-13 | 2018-06-11 | SCAN DISPLAY DEVICE, SCAN DISPLAY SYSTEM AND METHOD OF MANUFACTURING A LIGHT DIFFUSING PART |
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