WO2014045340A1 - Élément optique, source lumineuse et affichage tête haute - Google Patents

Élément optique, source lumineuse et affichage tête haute Download PDF

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Publication number
WO2014045340A1
WO2014045340A1 PCT/JP2012/073836 JP2012073836W WO2014045340A1 WO 2014045340 A1 WO2014045340 A1 WO 2014045340A1 JP 2012073836 W JP2012073836 W JP 2012073836W WO 2014045340 A1 WO2014045340 A1 WO 2014045340A1
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WO
WIPO (PCT)
Prior art keywords
light
microlens
light source
screen
optical element
Prior art date
Application number
PCT/JP2012/073836
Other languages
English (en)
Japanese (ja)
Inventor
育也 菊池
柳澤　琢麿
今井　哲也
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2012/073836 priority Critical patent/WO2014045340A1/fr
Publication of WO2014045340A1 publication Critical patent/WO2014045340A1/fr

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Classifications

    • 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
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G02B3/0068—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between arranged in a single integral body or plate, e.g. laminates or hybrid structures with other optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/09—Multifaceted or polygonal mirrors, e.g. polygonal scanning mirrors; Fresnel mirrors
    • 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
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view

Definitions

  • the present invention relates to a display technology using a microlens array.
  • Patent Document 1 discloses a technique for generating an intermediate image using a dual lens array in which two microlens arrays are arranged to face each other at a predetermined distance.
  • the dual lens array light that has passed through one lens array is collected by the other lens array and then emitted.
  • the optical element includes a microlens array unit in which a plurality of microlenses are arranged, and a reflection unit disposed to face the microlens array unit, and the microlens array unit The light that has passed through is reflected by the reflecting portion and then condensed on the incident microlens.
  • the reflection unit has a positive power. According to this aspect, the reflection unit can preferably reflect the light that has passed through each microlens and collect the light on the same microlens.
  • the microlens array part and the reflection part are integrally configured. According to this aspect, it is not necessary to align the microlens array portion and the reflecting portion, and the dual lens array can be simply configured, and a positional shift due to a change with time or the like does not occur.
  • the light emission pattern conversion unit 33 converts the bit data converted by the bit data conversion unit 32 into a signal representing the light emission pattern of each laser.
  • the servo circuit 81 controls the operation of the MEMS mirror 10 based on a signal from the timing controller.
  • the light receiving element 50 receives a part of the laser light emitted from each laser light source.
  • the light receiving element 50 is a photoelectric conversion element such as a photodetector, and supplies a detection signal “Sd”, which is an electrical signal corresponding to the amount of incident laser light, to the laser driver ASIC 7.
  • Sd a detection signal
  • the laser driver ASIC 7 adjusts the power of the red laser LD1, the blue laser LD2, and the green laser LD3 according to the detection signal Sd.
  • the laser driver ASIC 7 operates only the red laser driving circuit 71, supplies a driving current to the red laser LD1, and emits red laser light from the red laser LD1. A part of the red laser light is received by the light receiving element 50, and a detection signal Sd corresponding to the amount of light is fed back to the laser driver ASIC7.
  • the laser driver ASIC 7 adjusts the drive current supplied from the red laser drive circuit 71 to the red laser LD1 so that the light amount indicated by the detection signal Sd is an appropriate light amount. In this way, power adjustment is performed.
  • the power adjustment of the blue laser LD2 and the power adjustment of the green laser LD3 are similarly performed.
  • FIG. 3 is a sectional view of the screen 12 according to the first embodiment.
  • the direction perpendicular to the surface (microlens array 21 and reflection surface 22 described later) formed by the screen 12 is the “Z-axis direction”, and the direction perpendicular to the Z-axis direction in FIG.
  • the main scanning direction of the emitted light is called the “Y-axis direction”, the Z-axis direction and the direction perpendicular to the Y-axis direction, and the sub-scanning direction of the emitted light from the light source 1 is called the “X-axis direction”. Is determined as shown in FIG. 3 and FIG. 4 described later.
  • the reflective surface 22 functions as a mirror by applying a reflective coating or the like.
  • the reflecting surface 22 has a shape in which a mirror having positive power is divided into concentric circular or elliptical regions to reduce the thickness, and has a cross section similar to that of a Fresnel lens.
  • the mirror having the positive power described above is also referred to as “pre-division mirror Mb”.
  • the pre-division mirror Mb is, for example, an elliptical mirror, a parabolic mirror, a toroidal mirror, or the like.
  • the reflecting surface 22 functions as a “reflecting portion” in the present invention.
  • the reflecting surface 22 can preferably reflect the light that has passed through each microlens 210 and condense it on the same microlens 210.
  • the specific distance between the microlens array 21 and the reflecting surface 22 is the distance that the light incident on each microlens 210 is collected on the main surface of each microlens 210 after being reflected by the reflecting surface 22. For example, it is set based on an experiment or the like.
  • the light indicated by the light rays 32a to 32c having a larger incident angle on the screen 12 than the light indicated by the light rays 31a to 31c is incident on the microlens 210A, is reflected by the reflecting surface 22, and passes through the microlens 210A again.
  • the light indicated by the light rays 32a to 32c is condensed at a condensing point 211B on the main surface of the microlens 210B to form pixels of an intermediate image.
  • the light indicated by the light rays 34a to 34c having a larger incident angle on the screen 12 than the light indicated by the light rays 31a to 31c is incident on the microlens 210C, then reflected by the reflecting surface 22 and again passes through the microlens 210C. .
  • the light indicated by the light beams 34a to 34c is condensed at a condensing point 211C on the main surface of the microlens 210C, and constitutes an intermediate image pixel.
  • the reflecting surface 22 has the same function as the pre-division mirror Mb, the direction of the reflected light is appropriately directed toward the microlens 210A on which the light is incident even if the light has a large incident angle. to correct.
  • the reflecting surface 22 is a flat surface, the light incident on the microlens 210 when the incident angle on the screen 12 exceeds a predetermined angle determined by the numerical aperture of the microlens 210 will be described. It is reflected by other microlenses 210 without being reflected toward the. In this case, the observer cannot properly visually recognize the entire display image.
  • the viewing angle and the incident angle of light are limited by the numerical aperture of each microlens, whereas in the screen 12 according to the present embodiment, the viewing angle and the light Is not limited to the numerical aperture of each microlens 210.
  • NA sin ( ⁇ / 2)
  • NA the numerical aperture NA
  • NA the numerical aperture NA
  • NA the numerical aperture NA
  • the diffusion angle ⁇ can be adjusted by designing each microlens so that the curvature of the microlens becomes an appropriate value.
  • the diffusion angle ⁇ can be adjusted by designing each microlens so that the curvature of the microlens becomes an appropriate value.
  • the diffusion angle ⁇ can be reduced by increasing the radius of curvature of each microlens, and the diffusion angle ⁇ can be increased by decreasing the radius of curvature of each microlens.
  • the viewing angle and the luminance are in a trade-off relationship, and the incident angle of light is limited by the numerical aperture NA of each microlens.
  • the screen 12 according to the present embodiment has an effect that the viewing angle can be widened without reducing the luminance, and the incident angle of light is not limited by the numerical aperture NA of each microlens.
  • the screen 12 includes the microlens array 21 in which a plurality of microlenses 210 are arranged, and the reflective surface 22 that is disposed to face the microlens array 21.
  • the light that has passed through the lens array 21 is reflected by the reflecting surface 22 and then condensed on the incident microlens 210.
  • the screen 12 can reflect the light that has passed through each microlens and collect it on the same microlens. Therefore, as with the dual lens array, the screen 12 achieves high resolution and has uneven luminance at the observation point. Etc. can be reduced. Further, the screen 12 can realize a wide viewing angle while maintaining the luminance appropriately.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

L'élément optique selon l'invention comporte une section à trame de microlentilles, et une section réfléchissante. La section à trame de microlentilles contient une pluralité de microlentilles alignées. La section réfléchissante est disposée de manière à faire face à la section à trame de microlentilles. La lumière qui a traversé la section à trame de microlentilles est réfléchie par la section réfléchissante, puis collecté au niveau de microlentilles autres que les microlentilles d'entrée de lumière.
PCT/JP2012/073836 2012-09-18 2012-09-18 Élément optique, source lumineuse et affichage tête haute WO2014045340A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/073836 WO2014045340A1 (fr) 2012-09-18 2012-09-18 Élément optique, source lumineuse et affichage tête haute

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/073836 WO2014045340A1 (fr) 2012-09-18 2012-09-18 Élément optique, source lumineuse et affichage tête haute

Publications (1)

Publication Number Publication Date
WO2014045340A1 true WO2014045340A1 (fr) 2014-03-27

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PCT/JP2012/073836 WO2014045340A1 (fr) 2012-09-18 2012-09-18 Élément optique, source lumineuse et affichage tête haute

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109507798A (zh) * 2017-09-15 2019-03-22 中强光电股份有限公司 近眼显示装置
EP3951445A4 (fr) * 2019-03-27 2022-12-21 Kuraray Co., Ltd. Dispositif hud et film à motif irrégulier fin
WO2023007230A1 (fr) * 2021-07-30 2023-02-02 Wayray Ag Dispositif d'affichage tête haute holographique compact
EP4198611A1 (fr) * 2021-12-14 2023-06-21 FUJIFILM Corporation Dispositif de balayage de lumière

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100079861A1 (en) * 2008-09-29 2010-04-01 Microvision, Inc. Exit Pupil Forming Scanned Beam Projection Display Having Higher Uniformity
JP2010145745A (ja) * 2008-12-18 2010-07-01 Equos Research Co Ltd 画像形成装置、及び、ヘッドアップディスプレイ装置
WO2012042744A1 (fr) * 2010-10-01 2012-04-05 パナソニック株式会社 Dispositif d'affichage, corps mobile et dispositif de commande

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100079861A1 (en) * 2008-09-29 2010-04-01 Microvision, Inc. Exit Pupil Forming Scanned Beam Projection Display Having Higher Uniformity
JP2010145745A (ja) * 2008-12-18 2010-07-01 Equos Research Co Ltd 画像形成装置、及び、ヘッドアップディスプレイ装置
WO2012042744A1 (fr) * 2010-10-01 2012-04-05 パナソニック株式会社 Dispositif d'affichage, corps mobile et dispositif de commande

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109507798A (zh) * 2017-09-15 2019-03-22 中强光电股份有限公司 近眼显示装置
EP3951445A4 (fr) * 2019-03-27 2022-12-21 Kuraray Co., Ltd. Dispositif hud et film à motif irrégulier fin
WO2023007230A1 (fr) * 2021-07-30 2023-02-02 Wayray Ag Dispositif d'affichage tête haute holographique compact
EP4198611A1 (fr) * 2021-12-14 2023-06-21 FUJIFILM Corporation Dispositif de balayage de lumière

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