[go: up one dir, main page]

WO2007116745A1 - Element de diffraction de transmission et affichage par projection de globe oculaire - Google Patents

Element de diffraction de transmission et affichage par projection de globe oculaire Download PDF

Info

Publication number
WO2007116745A1
WO2007116745A1 PCT/JP2007/056417 JP2007056417W WO2007116745A1 WO 2007116745 A1 WO2007116745 A1 WO 2007116745A1 JP 2007056417 W JP2007056417 W JP 2007056417W WO 2007116745 A1 WO2007116745 A1 WO 2007116745A1
Authority
WO
WIPO (PCT)
Prior art keywords
diffraction element
translucent substrate
light
diffraction
depth
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2007/056417
Other languages
English (en)
Japanese (ja)
Inventor
Narihiro Haneda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
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 Brother Industries Ltd filed Critical Brother Industries Ltd
Publication of WO2007116745A1 publication Critical patent/WO2007116745A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
    • 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

Definitions

  • the present invention relates to a transmissive diffraction grating, and more particularly to a transmissive diffraction element used for enlarging the diameter of an exit pupil in an eyeball projection display device or the like.
  • a head-mounted display capable of enjoying a large screen in a virtual space.
  • a small liquid crystal display element is incorporated in goggles and attached to the head, and an image projected on the liquid crystal display element is condensed by a convex lens and is imaged on the retina (see, for example, Patent Document 1).
  • a display device has been developed that projects an image from the dashboard of a car onto the windshield and focuses the reflected light reflected by the windshield power on the retina.
  • FIG. 15 (a) is a schematic diagram for explaining an eyeball projection display device in which a goggle incorporating a liquid crystal display is attached to the head to form an image on the retina.
  • the illumination system 101 irradiates the liquid crystal display element 100 from behind, and the image displayed on the liquid crystal display element 100 is condensed by the convex lens 102 and formed on the retina 104 of the user's eyeball 103.
  • the convex lens 102 has a small numerical aperture in order to suppress the aberration. Therefore, the diameter of the exit pupil 120 of the optical system including the liquid crystal display element 100 and the convex lens 102 is small. When the exit pupil 120 and the pupil 106 coincide as shown in FIG.
  • the images of the points P1 and P2 on the liquid crystal display element 100 pass through the pupil 106 and the points Pl ′ and P2 ′ on the retina 104 To form an image.
  • the surrounding image can be observed.
  • FIG. 15B when the user rotates the eyeball, the position between the exit pupil 120 and the pupil 106 is shifted. For this reason, the peripheral image is kicked, and in an extreme case, it is difficult to recognize the image.
  • FIG. 16 (a) shows the state where the incident light is split and emitted using two diffraction gratings. Light incident from the left side is diffracted by the first diffraction grating 107 and diffracted again by the second diffraction grating 108 to be parallel light. Convex It is arranged between the lens 102 and the eyeball 103 so that the diameter of the exit pupil 120 is enlarged. As shown in FIG.
  • FIG. 16C is a cross-sectional view of the diffraction element 110 used in this type of display device.
  • a diffraction grating having a rectangular uneven portion 112 is formed on the surface of a translucent substrate 111.
  • Patent Document 1 Japanese Patent Laid-Open No. 7-72422
  • Patent document 2 JP-A-8-184779
  • a diffraction grating used as a dividing element of an eyeball projection display device needs to be designed to satisfy the light intensity balance and color balance of each diffracted light. That is, it is necessary to appropriately set the light intensity balance between the 0th-order folded light having a diffraction angle of 0 ° and the ⁇ 1st-order diffracted light having a diffraction angle.
  • the light intensity of the light diffracted by the diffraction grating has wavelength dependency.
  • ⁇ 1st order diffracted light when using ⁇ 1st order diffracted light as split light to enlarge the exit pupil, the light intensity of a specific color is strong and the light intensity of other colors is weak at each wavelength of red, green, and blue In this case, the color balance of the image around the point P2 ′ projected on the retina is lost. As a result, the observer cannot see natural images. Therefore, it is necessary to maintain the light intensity balance between the 0th-order diffracted light and the ⁇ 1st-order diffracted light and also to maintain the color balance.
  • a rectangular diffractive element as shown in Fig. 16 (c) is used. In some cases, the rectangular shape had to be manufactured with extremely high accuracy of several tens of nanometers in the lattice pitch direction and several nanometers in the lattice depth direction.
  • a bottom portion of the uneven portions is provided in a transmissive diffraction element in which uneven portions are periodically formed on a surface of a light-transmitting substrate.
  • the side part between the upper side part and the upper side part has a predetermined inclination angle inclined with respect to the normal of the surface
  • a transmissive diffraction element is obtained.
  • the side portion between the upper side portion and the bottom side portion of the periodic concavo-convex portion has a trapezoidal shape having a predetermined inclination angle that is inclined with respect to the direction perpendicular to the surface. Therefore, when the base material of the diffractive element is poured into the mold and cooled or reacted, and then released, the release is facilitated, and the manufacturing tolerance is large, so that the manufacture is facilitated. It has the advantage of Also, when silicon oxide is used for the base material and it is manufactured by wet etching or dry etching, the manufacturing tolerance is increased, so that the manufacturing is facilitated.
  • the concavo-convex portion may be periodically formed in two directions perpendicular to each other on the surface, and may be a transmissive diffraction element.
  • the concavo-convex portion is formed on the light-exiting surface from which the incident light exits from the translucent substrate, with respect to the translucent substrate. ! It can also be used as a transmissive diffractive element.
  • the transmissive diffraction element of the present invention when the translucent substrate is silicon oxide or when the refractive index of the translucent substrate is approximately 1.45, the inclination angle is A transmissive diffraction element having a range of 17 ° to 55 ° may be used.
  • the transmissive diffraction element of the present invention when the translucent substrate is an acrylic resin, or when the refractive index of the translucent substrate is approximately 1.49, the tilt angle is 10 ° to 75 ° A transmission type diffractive element in the range may be used.
  • transmissive diffraction element of the present invention when the translucent substrate is a cycloolefin resin or when the refractive index of the translucent substrate is approximately 1.53, A transmission type diffraction element having an angle in the range of 2 ° to 55 ° may be used.
  • the pitch of the uneven portion is P
  • the length of the bottom side is L
  • the depth of the bottom side with respect to the top side is D.
  • the depth D is in the range of 400 nm to 600 nm
  • the duty ratio DR is LZP
  • the duty ratio DR is in the range of 0.2 to 0.3 or 0.7 to 0.8. It may be an element.
  • the depth of the concavo-convex portion is in the range of 400 nm to 600 nm and the duty ratio is in the range of DRO. 2 to 0.3 or 0.7 to 0.8.
  • the depth D may be a transmission diffraction element having a range of 500 nm to 570 nm.
  • the depth of the concavo-convex part is 500 ⁇ ! Since it is in the range of ⁇ 570 nm, there is an advantage that diffracted light with a good balance of light intensity and color between 0th order diffracted light and ⁇ 1st order diffracted light can be obtained.
  • a video projection unit that projects a video
  • An optical part for introducing the image into the user's eyeball, and an emission formed by the optical part An eyeball projection type display device comprising a diffractive part for enlarging the pupil, wherein the diffractive part has irregularities periodically formed on the surface of the translucent substrate,
  • the side part between the upper side part and the upper side part is a transmissive diffractive element having a predetermined inclination angle inclined with respect to the normal of the surface.
  • the video projection unit, the optical unit that introduces the projected image from the video projection unit into the eyeball, and the exit pupil formed by the optical unit are enlarged.
  • a periodic uneven part is formed on the surface of the translucent substrate as the diffraction part, and the side part between the top part and the bottom part is formed.
  • Has a predetermined inclination angle with respect to the perpendicular so that it is easy to manufacture and can display a color-balanced image even when the eyeball is rotated. .
  • the trapezoid having a predetermined inclination angle that inclines the side portion between the upper side portion and the bottom side portion of the periodic uneven portion with respect to the surface in the vertical direction.
  • the eyeball projection display device of the present invention it is easy to manufacture, and even if the eyeball is rotated, an image having a color balance can be visually recognized by the user.
  • FIG. 1 is a perspective view of a diffraction element according to an embodiment of the present invention.
  • FIG. 2 is an explanatory diagram for explaining diffraction of the diffraction grating according to the embodiment of the present invention.
  • FIG. 3 is a perspective view of a diffraction element according to an embodiment of the present invention.
  • FIG. 4 is an explanatory view showing irregularities on the surface of the diffraction element according to the embodiment of the present invention.
  • FIG. 5 is a graph showing diffraction depth versus diffraction efficiency of a diffraction element according to an embodiment of the present invention.
  • FIG. 6 is a graph showing diffraction depth versus diffraction efficiency of a diffraction element according to an embodiment of the present invention.
  • FIG. 7 is a graph showing diffraction depth versus diffraction efficiency of the diffraction element according to the embodiment of the present invention. is there.
  • FIG. 8 is a graph showing diffraction depth versus diffraction efficiency of a diffraction element according to an embodiment of the present invention.
  • FIG. 9 is a graph showing the deviation of the grating depth versus the deviation of the diffraction element according to the embodiment of the present invention.
  • FIG. 10 is a graph showing the tilt angle of the diffractive element according to the embodiment of the present invention versus the allowable depth error of the grating.
  • FIG. 11 is a graph showing the tilt angle of the diffractive element according to the embodiment of the present invention versus the depth tolerance of the grating.
  • FIG. 12 is a graph showing the tilt angle of the diffractive element according to the embodiment of the present invention versus the depth tolerance of the grating.
  • FIG. 13 is an explanatory view showing an eyeball projection type liquid crystal display device according to an embodiment of the present invention.
  • FIG. 14 is a block diagram showing an eyeball-type liquid crystal display device according to an embodiment of the present invention.
  • FIG. 15 is an explanatory view showing a conventionally known head-mounted image display device.
  • FIG. 16 is an explanatory view showing a conventionally known head-mounted image display device and diffraction element. Explanation of symbols
  • FIG. 1 is a perspective view of a diffraction element 1 showing an embodiment of the present invention.
  • Convex portions 3 and concave portions 4 are periodically formed in the X direction on the surface of the translucent substrate 2.
  • a side portion 5 is formed between the upper side portion of the convex portion 3 and the bottom side portion of the concave portion 4 and has an inclination angle inclined with respect to the vertical direction. That is, the convex portion has a trapezoidal cross section.
  • translucent glass or translucent resin can be used as the material of the translucent substrate 2 of the diffraction element 1.
  • translucent glass or translucent resin can be used.
  • silicon dioxide (SiO 2), acrylic resin (PMMA), cycloolefin resin (COP), or the like can be used.
  • this type of diffraction element 1 is formed into a mold by pouring a translucent base material into a mold composed of a mold or the like in which a grating is formed in advance by cutting or lithography, and cooling or reacting. It is manufactured by a method of transferring the formed grating to a translucent substrate. Periodically formed concave and convex parts are trapezoidal with the side part 5 between the upper side part 6 and the bottom side part 7 inclined, so that it is easy to release the translucent substrate from the mold. It becomes.
  • FIG. 2 is an explanatory diagram for explaining diffraction of light with respect to incident light of the diffraction element 1.
  • the same reference numerals are given to the same parts or parts having functions.
  • the light incident in the z direction is separated into zero-order diffracted light, ⁇ first-order diffracted light having a diffraction angle ⁇ (hereinafter collectively referred to as first-order diffracted light), and higher-order diffracted light according to the black diffraction conditions.
  • V, 0th-order diffracted light and 1st-order diffracted light are handled, and higher-order diffracted light is ignored! /, Ru.
  • the exit pupil diameter is increased using this first-order diffracted light.
  • gratings are periodically formed in the X direction. Therefore, the first-order diffracted light spreads in the X direction.
  • FIG. 3 is a perspective view of the diffraction element 1 showing another embodiment of the present invention.
  • symbol was attached
  • convex portions 3 and concave portions 4 are periodically formed on the surface of the translucent substrate 2 in the X direction and the y direction. Therefore, the light transmitted through the translucent substrate 2 is diffracted in two directions orthogonal to the X direction and the y direction.
  • the exit pupil diameter is enlarged in the horizontal and vertical directions. Note that Fig.
  • FIG. 3 shows an example in which the concavo-convex portions are formed in two orthogonal directions, and the ridge-shaped convex portion 3 is formed in a hexagon, and the concavo-convex portions may be formed in three directions that are different by 60 degrees.
  • the trapezoidal convex portions 3 may be formed concentrically.
  • FIG. 4 shows the shape of the concavo-convex portion of one cycle in the X direction of the diffraction element 1 shown in FIG.
  • the same reference numerals are given to the same parts or parts having functions.
  • the pitch of one cycle is P
  • the length of the base 7 of the recess 4 is L
  • the depth of the base 7 with respect to the top 6 is D
  • the inclination angle of the side 5 with respect to the vertical is 0.
  • FIG. 5 is a graph showing the relationship between the grating depth D of the diffraction element 1 and the diffraction efficiency when the duty ratio DR is 0.90.
  • the vertical axis represents the diffraction efficiency and the horizontal axis represents the grating depth D.
  • the diffraction efficiency means the ratio of the energy of outgoing light to the energy of incident light.
  • the depth D being 0 means that no diffraction grating is formed on the surface of the translucent substrate 2. From Fig. 5, when the depth D is changed from 0 to lOOOnm, the diffraction efficiency of the 0th order diffracted light is 60% for any light of red (R), green (G), and blue (B).
  • FIG. 6 is a graph showing the relationship between the grating depth D of the diffraction element 1 and the diffraction efficiency when the duty ratio DR is 0.75.
  • the diffraction efficiency of the 0th-order diffracted light decreases as the grating depth D decreases from lOOnm to 400nm, decreases most from 400nm to 600nm, and gradually increases from 600nm to: LOOOnm.
  • the diffraction efficiency of 1st-order diffracted light is opposite to 0th-order diffracted light. Increase gradually to 400nm, 400 ⁇ ! It becomes maximum at ⁇ 600nm, and gradually decreases from 60Onm to 1000nm.
  • both the 0th-order diffracted light and the 1st-order diffracted light have large variations in diffraction efficiency with respect to the light color.
  • the depth D is in the range of approximately 400 nm to 600 nm, the diffraction efficiencies between the 0th order diffracted light and the 1st order diffracted light are almost equal.
  • Depth D is 450 ⁇ ! In the range of ⁇ 550nm, the variation in diffraction efficiency for each color is small.
  • the duty ratio DR is preferably set to approximately 0.73.
  • FIG. 7 is a graph showing the relationship between the grating depth of the diffraction element 1 and the diffraction efficiency when the duty ratio DR is 0.5.
  • the diffraction efficiency of the 0th order diffracted light is 400 ⁇ in the grating depth D! Within 10 nm, it is 10% or less.
  • the diffraction efficiency of the 1st-order diffracted light shows a maximum value at a depth D force of 00 nm to 600 nm, which is about 40%. Therefore, the depth of the lattice D force 00 ⁇ ! ⁇ 6 1st order diffracted light is dominant around OOnm.
  • FIG. 8 is a graph showing the relationship between the grating depth of the diffraction element 1 and the diffraction efficiency when the duty ratio DR is 0.25. In this case, the same characteristics as when the duty ratio DR is 0.75 are shown. When the duty ratio DR is 0.25, it corresponds to the case where the length of the bottom and top sides of the concavo-convex part is reversed.
  • the duty ratio DR is set to 0.2.
  • the grating depth D is preferably in the range of 400 nm to 600 nm, more preferably in the range of 450 nm to 550 nm.
  • the duty ratio DR is preferably about 0.73, or about 0.27 in which the length of the side of the uneven portion is reversed.
  • the transmissive diffraction grating using the translucent substrate 2 uses light interference based on the optical path difference between the transmitted light that passes through the bottom portion 7 and the transmitted light that passes through the upper portion 6. Yes. Therefore, it is necessary to form the grating depth D with high accuracy. Therefore, for the material of the translucent substrate 2 having a different refractive index, an allowable error representing an allowable error in forming the grating depth D was obtained by changing the inclination angle ⁇ . The larger this tolerance is, the easier it is to manufacture the diffraction element 1.
  • the 0th-order diffracted light and the 1st-order diffracted light of the diffractive element 1 are required to maintain color balance for each of R, G, and B colors.
  • diffractive element 1 is applied to an eyeball projection display device and the color balance of diffractive element 1 is lost, the recognized image becomes unnatural.
  • So 0th order diffraction of G light The deviation of R light and B light is specified based on the ratio of the light and the first-order diffracted light, and the range of the inclination angle ⁇ where the color balance is not lost is obtained.
  • the output light intensity of the 0th-order diffracted light and the 1st-order diffracted light for each color of the incident light is defined as follows.
  • RO Ratio of the 0th-order diffracted light intensity of R light to the incident light intensity incident on diffraction element 1 of R (red) light
  • R1 The ratio of the first-order diffracted light intensity of R light to the incident light intensity incident on diffraction element 1 of R (red) light
  • GO The ratio of the 0th-order diffracted light intensity of the G light to the incident light intensity incident on the diffraction element 1 of G (green) light
  • G1 Ratio of the first-order diffracted light intensity of G light to the incident light intensity incident on diffraction element 1 of G (green) light
  • B1 Ratio of the first-order diffracted light intensity of B light to the incident light intensity incident on diffraction element 1 for B (blue) light
  • the deviation of R light is the value obtained by subtracting 1 from the value obtained by dividing the light intensity ratio of the first-order diffracted light with respect to the 0th-order diffracted light of G by calculating the light intensity ratio of the first-order diffracted light with respect to the 0th-order diffracted light of R. It is.
  • B light when the deviation power SO of the R light is SO, it means that the ratio of the 1st order diffracted light of the G light and the 0th order diffracted light and the ratio of the 1st order diffracted light of the R light and the 0th order diffracted light are the same. To do. The same applies to B light.
  • FIG. 9 is a graph showing the deviation (R 1) of the R light and the deviation (B 1) of the B light when the length L of the base 7 is 3 ⁇ m and the grating depth D is changed. is there.
  • the horizontal axis shows the depth D of the lattice, and the vertical axis shows the deviation defined above.
  • diffractive element 1 is applied to an eyeball projection display device, the color balance of the image is lost if the deviation exceeds 0.2. So this deviation is less than 0.2 It is necessary to suppress it.
  • the deviation of blue B increases and the deviation of red R decreases as the grating depth D increases. From Figure 9, the depth D is 515 ⁇ ! In the range of ⁇ 526 ⁇ m, the deviation is less than 0.2 for any color.
  • the allowable error of depth D is about l lnm.
  • the preferable range of the depth D is 500 nm to 570 nm.
  • the length L of the base 7 is preferably 3 ⁇ m and 100 ⁇ m! / ⁇ .
  • Figure 10 shows the tolerance of the grating depth D when the tilt angle ⁇ is changed using silicon dioxide (refractive index n is approximately 1.45) as the translucent substrate 2. It is a graph showing. The multiple curves represent the tolerance when the duty ratio is fixed and the base length L is varied between 13. O ⁇ m-13. (The base length L is a is 13. O ⁇ m, b is 13. 1 ⁇ m, c force is 13.2 ⁇ ⁇ , d force is 13. 3 / ⁇ ⁇ , e force is 13.4 ⁇ ⁇ , f force is 13.5 / zm Is). From Fig. 10, the tolerance of depth D is small in the case of silicon dioxide. Among them, the range of the tilt angle ⁇ that can make the tolerance 10nm or more is approximately 17 ° to 55 °.
  • FIG. 11 is a graph showing the tolerance of the grating depth D when the inclination angle ⁇ is changed using acrylic resin (refractive index n is approximately 1.49) as the translucent substrate. It is. The multiple curves are the same as in Figure 10 above. From Fig. 11, the range of tilt angle ⁇ where the allowable error can be 20 nm or more is approximately 10 ° to 75 °, and the range of tilt angle ⁇ where the allowable error can be 30 nm or more is approximately 15 ° to 65 The range of the inclination angle ⁇ that allows the tolerance to be 40 nm or more with respect to the length L of the specific base is approximately 22 ° to 52 °.
  • FIG. 12 shows the depth of the grating when the tilt angle ⁇ is changed by using cycloolefin resin (refractive index n is approximately 1.5 3 with respect to the D line) as the translucent substrate 2.
  • 3 is a graph showing an allowable error of D.
  • the multiple curves are the same as in FIG. From Fig. 12, it is clear that the tolerance value of the grating depth D is larger than that of silicon dioxide or talyl resin. This is thought to be due to the fact that the refractive index of cycloolefin resin is higher than that of silicon dioxide or acrylic resin.
  • the range of tilt angle ⁇ that can have an allowable error of 30 nm or more is approximately 2 ° to 55 °, and the range of tilt angle ⁇ that can have an allowable error of 40 nm or more is approximately 3 ° to 50 °. Tilting that allows the tolerance to be 50 nm or more for a specific base length L The range of the oblique angle ⁇ is approximately 5 ° to 38 °.
  • a trapezoidal grating with an inclination angle is more allowable with a depth D than a rectangular grating with an inclination angle ⁇ of 0 °. Is big. Therefore, it is easier to manufacture a trapezoidal diffraction element than a rectangular diffraction element.
  • the larger the refractive index the larger the tolerance, and the diffraction element 1 can be easily manufactured.
  • the tolerance of the grating depth D can be increased. For example, even when silicon oxide is used as the translucent substrate 2, the graph e in Fig. 10 shows that the length L of the base 7 is 13.4 ⁇ m and the inclination angle ⁇ is approximately 25 °. If designed in the range of ⁇ 40 °, the tolerance can be increased to 15nm or more.
  • FIG. 13 is an explanatory view showing an embodiment in which the transmission type diffraction element according to the present invention is applied to an eyeball projection type display device.
  • An image projection unit is configured by the liquid crystal display element 11 and the illumination system 10 that irradiates the liquid crystal display element 11 with white light from the back.
  • the image displayed on the liquid crystal display element 11 is introduced into the eyeball 14 by the optical unit including the convex lens 12 and the convex lens 13 and forms an image on the retina 15.
  • a diffractive element 1 which is a diffractive portion is arranged between a convex lens 12 and a convex lens 13.
  • the diffractive element 1 which is a diffractive portion has concave and convex portions periodically formed on the surface of the translucent substrate 2, and the side portion 5 between the top portion 6 and the bottom portion 7. Has a tilt angle.
  • the image projected from the liquid crystal display element 11 is separated into 0th order diffracted light and 1st order diffracted light ( ⁇ 1st order diffracted light) by the diffractive element 1 through the convex lens 12, and the diameter of the exit pupil is enlarged. Even when the eyeball 14 is rotated, the diameter of the exit pupil is enlarged, so that the image of the point P2 around the liquid crystal display element 11 can be imaged on the retina 15 without being kicked.
  • the formed image has high brightness uniformity and color balance.
  • the diffractive element 1 can be used in place of the convex lens 13.
  • the diffraction element 1 having the concavo-convex portions formed in two orthogonal directions is used as the diffraction element 1
  • an image with little kicking is formed on the retina 15 even if the eyeball 14 is rotated to the upper left and right. I can do it.
  • diffractive element 1 in which trapezoidal uneven portions are periodically formed on both the front and back surfaces of translucent substrate 2 can be used.
  • an image projection unit such as a plasma display or an electo-luminance display can be used.
  • This eyeball projection display device includes a video projection unit including a light source unit 40 including a light source and a video signal processing circuit, a horizontal scanning system 31 that scans an image in a horizontal direction, a vertical scanning system 32 that scans an image in a vertical direction, And an optical part comprising a lens system and a diffraction part comprising a diffraction element 1 for enlarging the exit pupil formed by the lens system. Furthermore, a wavefront curvature modulator 37 for modulating the wavefront curvature of the light beam emitted from the light source unit 40 through the optical fiber 39 is provided.
  • This eyeball projection display device scans a light beam modulated in accordance with a video signal in a two-dimensional direction and directly displays an image on the network 15.
  • the uneven portion is periodically formed on the surface of the translucent substrate 2, and the side edge between the upper side portion 6 and the bottom side portion 7 is formed.
  • Part 5 has an inclination angle that inclines.
  • the R laser driver 51, the G laser driver 52, and the B laser driver 53 of the light source unit 40 output luminance signals to the R laser 48, G laser 49, and B laser 50, respectively, and these laser powers also modulate the luminance of each color.
  • the laser beam is output.
  • the laser beams of the respective colors are synthesized by the optical coupling system 41 via the collimator lenses 45, 46, 47 and the dichroic mirrors 42, 43, 44, and output to the optical fiber 39.
  • the light beam emitted from the optical fiber 39 is reflected by the beam splitter 33, further reflected by the reflection mirror 36 controlled by the wavefront curvature modulator 37, and the polygon mirror 30 (instead of the polygon mirror) via the converging lens 35.
  • the light beam is horizontally scanned by the polygon mirror 30 and is passed through the front lens group 29, the diffractive element 1 having the trapezoidal convex portion according to the present embodiment, and the rear lens group 27 (galvano mirror 26 (polygon mirror). May be emitted).
  • the galvanometer mirror 26 scans the incident light beam in the vertical direction.
  • the vertical scanning system 23 is composed of a front lens group 24 and a rear lens group 25, and light beams scanned vertically and horizontally pass through the pupil 21 and form an image on the retina 15 of the eyeball 14.
  • the diffraction pupil 1 having the trapezoidal convex portion increases the exit pupil diameter, and even if the eyeball 14 is rotated, the image of the peripheral portion can be suppressed from being kicked.
  • the force described in the embodiment in which the diffraction element 1 according to the present invention is applied to an eyeball projection display device is not limited to this.
  • it can be applied to a disk writing or reading device by a laser.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un élément de diffraction translucide pour l'utilisation dans un affichage par projection de globe oculaire qui comporte une surface rectangulaire ; étant donné que la profondeur du côté inférieur du rectangle à partir du côté supérieur de celui-ci requiert une précision de l'ordre de quelques mm pour la fabrication, cette dernière n'est pas facile. Dans un élément de diffraction de transmission comportant des saillies et des renfoncements formés de manière cyclique sur la surface d'un substrat translucide, l'erreur tolérable dans la profondeur de structure réticulaire peut être augmentée en employant une forme trapézoïdale telle que les côtés entre le côté inférieur et le côté supérieur de la saillie et du renfoncement comportent un angle d'inclinaison prédéterminé par rapport à la normale quant à la surface. Par conséquent, un élément de diffraction facile à fabriquer peut être mis à disposition.
PCT/JP2007/056417 2006-03-30 2007-03-27 Element de diffraction de transmission et affichage par projection de globe oculaire Ceased WO2007116745A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006093172A JP2007264555A (ja) 2006-03-30 2006-03-30 透過型回折素子及びこれを用いた眼球投影型表示装置
JP2006-093172 2006-03-30

Publications (1)

Publication Number Publication Date
WO2007116745A1 true WO2007116745A1 (fr) 2007-10-18

Family

ID=38581043

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/056417 Ceased WO2007116745A1 (fr) 2006-03-30 2007-03-27 Element de diffraction de transmission et affichage par projection de globe oculaire

Country Status (2)

Country Link
JP (1) JP2007264555A (fr)
WO (1) WO2007116745A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013512039A (ja) * 2009-11-24 2013-04-11 アルコン リサーチ， リミテッド 眼内照明のためのシングルファイバーマルチスポットレーザプローブ
JP5849954B2 (ja) * 2010-08-06 2016-02-03 旭硝子株式会社 回折光学素子及び計測装置
EP3396434A1 (fr) * 2017-04-28 2018-10-31 Samsung Display Co., Ltd. Dispositif d'affichage, affichage électroluminescent organique et visiocasque

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4582179B2 (ja) * 2008-03-31 2010-11-17 ブラザー工業株式会社 画像表示装置
JP5104480B2 (ja) 2008-03-31 2012-12-19 ブラザー工業株式会社 網膜走査型画像表示装置
JP5321520B2 (ja) * 2010-03-31 2013-10-23 ブラザー工業株式会社 直視型の画像表示装置
JP6171740B2 (ja) * 2013-09-02 2017-08-02 セイコーエプソン株式会社 光学デバイス及び画像表示装置
CN104765086B (zh) * 2015-04-13 2018-08-31 中国工程物理研究院激光聚变研究中心 一种具有单级衍射特性的梯形基元光栅
JP6736911B2 (ja) 2016-02-29 2020-08-05 セイコーエプソン株式会社 光束径拡大素子及び画像表示装置
JP2018017928A (ja) * 2016-07-28 2018-02-01 大日本印刷株式会社 画素拡大シート、表示装置、ゴーグル型表示装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1010307A (ja) * 1996-06-18 1998-01-16 Asahi Glass Co Ltd 光学回折格子の製造方法及びそれを用いた光ヘッド装置
JP2003066234A (ja) * 2001-08-30 2003-03-05 Sharp Corp スタンパおよびその製造方法並びに光学素子
JP2004219532A (ja) * 2003-01-10 2004-08-05 Nippon Sheet Glass Co Ltd 凹凸構造体およびその製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0550451A (ja) * 1991-08-27 1993-03-02 Dainippon Printing Co Ltd スクリーン用レンズシートの製造方法
JP3623250B2 (ja) * 1993-06-23 2005-02-23 オリンパス株式会社 映像表示装置
JP3492175B2 (ja) * 1997-12-19 2004-02-03 キヤノン株式会社 光学素子、該光学素子の成形型、該光学素子の成形方法及び該光学素子を有する光学装置
JP2000155286A (ja) * 1998-11-24 2000-06-06 Olympus Optical Co Ltd 映像表示装置
ATE480786T1 (de) * 2001-11-02 2010-09-15 Microvision Inc Display system mit einer vorrichtung zur erzeugung mehrerer bilder der austrittspupille in einer erweiterten austrittspupille
JP2003185977A (ja) * 2001-12-19 2003-07-03 Olympus Optical Co Ltd 画像表示装置
JP2005131882A (ja) * 2003-10-29 2005-05-26 Seiko Epson Corp 光学素子の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1010307A (ja) * 1996-06-18 1998-01-16 Asahi Glass Co Ltd 光学回折格子の製造方法及びそれを用いた光ヘッド装置
JP2003066234A (ja) * 2001-08-30 2003-03-05 Sharp Corp スタンパおよびその製造方法並びに光学素子
JP2004219532A (ja) * 2003-01-10 2004-08-05 Nippon Sheet Glass Co Ltd 凹凸構造体およびその製造方法

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013512039A (ja) * 2009-11-24 2013-04-11 アルコン リサーチ， リミテッド 眼内照明のためのシングルファイバーマルチスポットレーザプローブ
JP5849954B2 (ja) * 2010-08-06 2016-02-03 旭硝子株式会社 回折光学素子及び計測装置
US9477018B2 (en) 2010-08-06 2016-10-25 Asahi Glass Company, Limited Diffractive optical element and measurement device
EP3396434A1 (fr) * 2017-04-28 2018-10-31 Samsung Display Co., Ltd. Dispositif d'affichage, affichage électroluminescent organique et visiocasque
US20180314067A1 (en) * 2017-04-28 2018-11-01 Samsung Display Co. Ltd. Display device, organic light emitting display device, and head-mounted display device
CN108807467A (zh) * 2017-04-28 2018-11-13 三星显示有限公司 显示设备、有机发光显示设备以及头戴式显示设备
JP2018189959A (ja) * 2017-04-28 2018-11-29 三星ディスプレイ株式會社Ｓａｍｓｕｎｇ Ｄｉｓｐｌａｙ Ｃｏ．，Ｌｔｄ． 表示装置及び有機発光表示装置並びにヘッドマウント表示装置
US10684481B2 (en) 2017-04-28 2020-06-16 Samsung Display Co. Ltd. Display device, organic light emitting display device, and head-mounted display device
JP7226921B2 (ja) 2017-04-28 2023-02-21 三星ディスプレイ株式會社 表示装置及び有機発光表示装置並びにヘッドマウント表示装置
CN108807467B (zh) * 2017-04-28 2024-02-06 三星显示有限公司 显示设备、有机发光显示设备以及头戴式显示设备
US12117613B2 (en) 2017-04-28 2024-10-15 Samsung Display Co., Ltd. Display device, organic light emitting display device, and head-mounted display device

Also Published As

Publication number Publication date
JP2007264555A (ja) 2007-10-11

Similar Documents

Publication Publication Date Title
WO2007116745A1 (fr) Element de diffraction de transmission et affichage par projection de globe oculaire
CN108700750B (zh) 显示装置
JP6064467B2 (ja) 光拡散素子および画像表示装置
US11372250B2 (en) Head-mounted display having reflective elements
WO2015012138A1 (fr) Dispositif de projection de type à balayage
US20180067325A1 (en) Image display device
JPWO2005008330A1 (ja) ２次元画像形成装置
US9013641B2 (en) Projection type image display device
JP2009151221A (ja) 照明装置、画像表示装置及び偏光変換拡散部材
JP2017167181A (ja) 表示装置および導光装置
JP2018520380A (ja) ニアアイディスプレイのための装置および方法
JP2003295112A (ja) 走査型画像表示光学系、走査型画像表示装置および画像表示システム
US7835050B2 (en) Optical holographic device with a hologram optical element on an area smaller than an irradiation area, holographic image display device and head mounted display with a hologram optical element on an area smaller than an irradiation area
US20230044063A1 (en) Ar headset with an improved displa
JP2021524062A (ja) 多素子ディスプレイ照明システムを備えた電子デバイス
US11994687B2 (en) Meta-optics for virtual reality and augmented reality systems
JP2023502879A (ja) 中心窩投影を備えるライトフィールド仮想及び複合現実システム
CN108107621A (zh) 显示装置
JP4717196B2 (ja) 画像観察装置および画像観察システム
US20090141327A1 (en) System and Method for Dynamic Display System Illumination
JP2019191313A (ja) ヘッドアップディスプレイ装置
JP2000039582A (ja) 映像投影装置
US12196958B2 (en) Image projection apparatus
TWI427347B (zh) 光學成像系統
WO2015125283A1 (fr) Élément optique et affichage tête haute

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07739855

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07739855

Country of ref document: EP

Kind code of ref document: A1