CN113544569A - Optical element and image display device - Google Patents
Optical element and image display device Download PDFInfo
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- CN113544569A CN113544569A CN202080019319.2A CN202080019319A CN113544569A CN 113544569 A CN113544569 A CN 113544569A CN 202080019319 A CN202080019319 A CN 202080019319A CN 113544569 A CN113544569 A CN 113544569A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000000609 electron-beam lithography Methods 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention provides an optical element and an image display device, which can realize miniaturization and light weight and can project images in a plurality of directions. The optical element includes: a light guide part having a light incident surface, a plurality of side surfaces perpendicular to the light incident surface, and a back surface opposite to the light incident surface; and a plurality of diffraction grating sections formed on the surfaces of at least two or more surfaces selected from the side surfaces and the back surface.
Description
Technical Field
The present invention relates to an optical element and an image display device, and more particularly, to an optical element and an image display device using a diffraction grating.
Background
Conventionally, as a device for displaying various information in a vehicle, an instrument panel for displaying an icon by lighting has been used. In addition, with an increase in the amount of information displayed, it has been proposed to embed an image display device in the instrument panel or to configure the entire instrument panel with the image display device.
However, since the dashboard is located below the front windshield of the vehicle, the driver needs to move the line of sight downward during the operation of the vehicle in order to view the information displayed on the dashboard, which is not preferable from the viewpoint of safety. Accordingly, a Head-Up Display (hereinafter referred to as HUD) has been proposed which projects an image to a front windshield and reads information when a driver visually recognizes the front of a vehicle (see, for example, patent document 1).
Fig. 6 is a schematic diagram showing the structure of an optical element used in a HUD of the related art. An optical element including a waveguide unit 1, a diffraction grating unit 2, and reflective films 3a and 3b is housed in the HUD. The waveguide portion 1 has an inclined end face 1a, a back face 1b, and a front face 1c, and a diffraction grating portion 2 is provided therein. Reflective films 3a and 3b are formed on the back surface 1b and the front surface 1 c. The diffraction grating portion 2 is formed of a material having a refractive index different from that of the waveguide portion 1, and is a blazed grating having irregularities formed at predetermined intervals.
As shown in fig. 6, incident light L emitted from a light source unit (not shown)inEnters the waveguide portion 1 and is reflected by the inclined end surface 1 a. Incident light L reflected by the inclined end face 1ainTravels through the waveguide portion 1, is repeatedly reflected by the reflective films 3a and 3b on the rear surface 1b and the front surface 1c, and reaches the diffraction grating portion 2. The light reaching the diffraction grating part 2 is taken as the outgoing light LoutThe light is irradiated in a direction determined by the diffraction conditions of the diffraction grating section 2. Here, the diffraction conditions of the diffraction grating portion 2 are determined by the wavelength of light, the pitch of the diffraction grating portion 2, the difference in refractive index between the waveguide portion 1 and the diffraction grating portion 2, the angle at which light reaches the diffraction grating portion 2, and the like.
Patent document 1: japanese patent laid-open publication No. 2018-118669
However, in the conventional in-vehicle HUD, an optical device for projecting an image to a wide range of a front windshield is required, and it is difficult to reduce the size and weight of the optical device. In the HUD using the conventional diffraction grating, the projection destination of the image is limited to one direction. Therefore, the image display device using the conventional diffraction grating cannot cope with various situations of the driver during the operation of the vehicle, for example, cannot visually recognize information when the vehicle is turned backward when the vehicle is moving backward.
Disclosure of Invention
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an optical element and an image display device that can be reduced in size and weight and can project images in a plurality of directions.
In order to solve the above problem, an optical element according to the present invention includes: a light guide portion having a light incident surface, a plurality of side surfaces perpendicular to the light incident surface, and a back surface opposite to the light incident surface; and a plurality of diffraction grating sections formed on surfaces of at least two or more surfaces selected from the side surfaces and the back surface.
In the optical element of the present invention, since the light incident on the light guide portion from the light incident surface is irradiated in a predetermined direction by the plurality of diffraction grating portions, it is possible to project an image in a plurality of directions while achieving a reduction in size and weight.
In one embodiment of the present invention, a reflective film is formed on one of the side surface and the back surface on which the diffraction grating portion is not formed.
In one aspect of the present invention, the light incident unit includes a first light incident unit and a second light incident unit, and a first diffraction grating unit that first reaches first by first light incident from the first light incident unit is different from a second diffraction grating unit that first reaches second light incident from the second light incident unit.
In one aspect of the present invention, the first diffraction grating portion and the second diffraction grating portion are formed on the side surface.
In one aspect of the present invention, a prism is disposed on the light incident surface, and a gap is provided between the prism and the light incident surface.
In one aspect of the present invention, the diffraction grating portion is formed of a dielectric material having a refractive index different from that of the light guide portion.
Further, an image display device of the present invention includes any one of the optical elements described above; and a light source unit that irradiates the light incident surface with light, a part of the light being reflected at an interface between the diffraction grating unit and the light guide unit formed on the side surface and reaching the other diffraction grating units.
According to the present invention, it is possible to provide an optical element and an image display device which can be reduced in size and weight and can project images in a plurality of directions.
Drawings
Fig. 1 is a schematic perspective view showing the structure of an optical element 10 in the first embodiment.
Fig. 2 is a schematic cross-sectional view showing the configuration and optical path of an image display device using the optical element 10.
Fig. 3 is a diagram schematically showing image projection in a case where the optical element 10 is disposed in the vehicle 100.
Fig. 4 is a schematic cross-sectional view showing the structure and optical path of the optical element 10 in the second embodiment.
Fig. 5 is a schematic plan view showing the structure of the optical element 10 in the third embodiment.
Fig. 6 is a schematic diagram showing the structure of an optical element used in a HUD of the related art.
Detailed Description
(first embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent constituent elements, components, and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. Fig. 1 is a schematic perspective view showing the structure of an optical element 10 in the present embodiment. As shown in fig. 1, the optical element 10 includes a light guide portion 11, diffraction grating portions 12a, 12b, and 12c, and a prism 13. Fig. 1 schematically shows the structure of the optical element 10, and the dimensions and angles in the drawing do not show actual dimensions of the optical element 10.
The light guide portion 11 is a substantially plate-shaped portion made of a material that transmits light, and includes a light incident surface 11i, side surfaces 11a and 11c, and a back surface 11b, as shown in fig. 2. The dimension of the light guide portion 11 is not limited, but may be, for example, about 10mm in width d and about 10mm in thickness t. The material constituting the light guide portion 11 is not limited, but is preferably SiO2Glass having a refractive index of about 1.5 as a main component.
The light incident surface 11i is a flat surface into which light from a light source disposed outside the optical element 10 enters, is formed substantially perpendicular to the side surfaces 11a and 11c, and faces the rear surface 11 b. The side surfaces 11a and 11c are flat surfaces having diffraction grating portions 12a and 12c formed on the surfaces thereof, and are formed substantially perpendicular to the light incident surface 11i and the back surface 11 b. The rear surface 11b is a flat surface having a diffraction grating portion 12b formed on the front surface thereof, and faces the light incident surface 11 i.
The diffraction grating portions 12a, 12b, and 12c are substantially plate-shaped portions formed on the surfaces of the side surface 11a, the back surface 11b, and the side surface 11c, respectively, and are made of a material having a refractive index different from that of the light guide portion 11. A plurality of projections and recesses are periodically formed on the surfaces of the diffraction grating portions 12a, 12b, and 12c to form a diffraction grating. The convex portions and concave portions of the diffraction grating portions 12a, 12b, and 12c are formed to extend in stripes in a direction parallel to the light incident surface 11 i.
Although fig. 1 shows an example in which the projections and recesses of the diffraction grating portions 12a, 12b, and 12c are parallel to the light incident surface 11i, the projections and recesses are designed to satisfy the incident light L described later1The diffraction condition (2) is not necessarily parallel to the light incident surface 11 i. For example, the incident light L incident obliquely thereto may be1Extending in a stripe pattern in the vertical direction. The diffraction grating sections 12a, 12b, and 12c may be made of the same material or different materials. If the materials of the diffraction grating sections 12a, 12b, and 12c are different, the difference in refractive index at the interface between the diffraction grating sections 12a, 12b, and 12c and the light guide section 11 is made different, and the reflectance and the direction of diffraction at the interface can be made differentThe degree of freedom in optical design is further improved by changing the incident angle in the grating portions 12a, 12b, and 12 c.
The material constituting the diffraction grating portions 12a, 12b, and 12c is not limited, but a material having a large refractive index difference from the light guide portion 11 is preferably used, and for example, a material using TiO is preferably used2A dielectric material having a refractive index of about 2.5 as a main component. The dimensions of the diffraction grating portions 12a, 12b, and 12c are not particularly limited, but the diffraction grating portions preferably have a thickness that can also transmit light in the in-plane direction. The diffraction grating portions 12a, 12b, and 12c can be formed by a known method, and for example, a nanoimprint technique, an EBL (Electron Beam Lithography) technique, or the like can be used.
The prism 13 is an optical member having a triangular cross section and disposed in the vicinity of the light incident surface 11 i. Further, a gap is provided between the light incident surface 11i and the prism 13, and an air layer is present between the light incident surface 11i and the prism 13. The material constituting the prism 13 is not limited, but in order to efficiently allow light from the light source to enter the light guide unit 11, the refractive indices of the prism 13 and the light guide unit 11 are preferably made to be the same, and the same material as the light guide unit 11 is preferably used.
It is preferable that the width of the gap provided between the light incident surface 11i and the prism 13 is of the order of the wavelength of light. Although an air layer is present in the gap in the example shown in fig. 1, the gap may be filled with a transparent contact liquid having a refractive index close to that of the light guide portion 11 in order to improve the optical coupling efficiency between the prism 13 and the light guide portion 11. Although fig. 1 shows an example in which the prisms 13 are arranged with a gap therebetween, the prisms may be brought into contact with each other without providing a gap therebetween. When the decrease in optical coupling efficiency due to the influence of optical scattering is within the allowable range, light may be directly incident on the light guide unit 11 from the light incident surface 11i without using the prism 13.
Next, the optical path in the optical element 10 will be described with reference to fig. 2. Fig. 2 is a schematic cross-sectional view showing the configuration and optical path of an image display device using the optical element 10. As shown in fig. 2, the image display device of the present embodiment includes an optical element 10, a collimator lens 14, and a light source 15. Laser light is irradiated from a light source 15 to the optical element 10, and collimated light enters the prism 13 through a collimator lens 14. Collimated light enters one surface of the prism 13, passes through the inside of the prism 13, and enters the gap from the surface on the gap side. Here, the region of the light incident surface 11i into which collimated light is incident corresponds to the light incident portion in the present invention.
The collimated light having passed through the prism 13 enters obliquely to the light incident surface 11i of the light guide unit 11 through the gap. Here, by making the width of the gap approximately equal to the wavelength, the light reflection at the interface between the prism 13 and the gap and at the interface between the gap and the light guide portion 11 can be reduced, and collimated light can be efficiently received into the light guide portion 11.
Collimated light incident from the light incident surface 11i is used as incident light L traveling inside the light guide portion 111The diffraction grating portion 12a on the surface of the side surface 11a is incident at an incident angle Φ. Incident light L at the interface between the light guide part 11 and the diffraction grating part 12a1A part of the light enters the diffraction grating section 12a, and a part of the light is reflected as reflected light in the light guide section 11. Incident light L1The traveling angle of light traveling in the diffraction grating portion 12a changes according to the refractive index of the light guide portion 11 and the diffraction grating portion 12a, and the light is emitted as the emitted light L2An emission angle theta satisfying a diffraction condition determined by the convex and concave portionsd1And (4) emitting in the direction. Further, by appropriately selecting the refractive index and the incident angle Φ, the condition of suppressed total reflection at the interface with air can be satisfied, and the light received into the diffraction grating section 12a is repeatedly reflected in the diffraction grating section 12a and propagates in the diffraction grating section 12 a.
Incident light L1The light reflected by the interface between the light guide portion 11 and the diffraction grating portion 12a in the light guide portion 11 travels to the rear surface 11b, enters the diffraction grating portion 12b on the front surface of the rear surface 11b at the incident angle Φ, and is partially incident into the diffraction grating portion 12b and is partially reflected again in the light guide portion 11. The light reflected again travels in the light guide portion 11 and reaches the side surface 11c, and enters the diffraction grating portion 12c on the surface of the side surface 11c at the incident angle Φ, and a part of the light enters the diffraction grating portion 12 c. The light incident into the diffraction grating parts 12b and 12c is taken as the outgoing light L3、L4The direction of the diffraction grating part 12a is the same as the direction of the convex partEmission angle theta of diffraction condition determined by the portions and the recessesd2、θd3And (4) emitting in the direction. Here, the outgoing light L radiated to the outside from the diffraction grating portions 12a, 12b, and 12c2、L3、L4Is determined by the pitch of the respective convex and concave portions. Therefore, by appropriately setting the diffraction grating sections 12a, 12b, and 12c, the emitted light L can be independently set2、L3、L4The emission direction of (1).
As described above, in the optical element 10 of the present embodiment, the light incident into the light guide portion 11 from the light incident surface 11i is partially reflected at the interfaces between the diffraction grating portions 12a, 12b, and 12c and the light guide portion 11 to reach the side surfaces 11a, the back surface 11b, and the side surfaces 11c, and the light is emitted in three directions from the diffraction grating portions 12a, 12b, and 12c as the emitted light L2、L3、L4Irradiating to the outside. Thus, by using the optical element 10, it is possible to project an image in a plurality of directions while achieving a reduction in size and weight.
Fig. 3 is a diagram schematically showing image projection in a case where the optical element 10 is disposed in the vehicle 100. As shown in fig. 3, an optical element 10 is disposed in the ceiling of the vehicle 100, and light is incident on the optical element 10 from a separately provided light source. As described in fig. 2, the outgoing light L is irradiated from the optical element 10 in three directions (front, center-down, rear) of the vehicle 1002、L3、L4. Outgoing light L directed forward2Outgoing light L projected to the front windshield 101 and directed rearward4Projected onto the rear window glass 102. Outgoing light L directed downward from the center3Projected onto a screen disposed within the vehicle. Here, as the screen, a non-transmissive white screen or a transmissive glass may be separately provided, or an interior of a vehicle may be used as the screen.
As described above, in the optical element 10 and the image display device of the present embodiment, it is possible to achieve a smaller size and a lighter weight as compared with the case of using a mirror or an optical lens, and to simultaneously project images in a plurality of directions.
(second embodiment)
Next, a second embodiment of the present invention will be described with reference to fig. 4. Description of the overlapping contents with the first embodiment will be omitted. Fig. 4 is a schematic cross-sectional view showing the structure and optical path of the optical element 10 in the present embodiment. The present embodiment is different from the first embodiment in that the reflective film 16 is formed on the surface of the rear surface 11 b.
The reflective film 16 is a film having a high reflectance so as to cover the rear surface 11 b. The material constituting the reflective film 16 is not limited, but is preferably formed by depositing a high-reflectance metal such as silver. Since the outgoing light is not radiated from the surface on which the reflective film 16 is formed, the projection direction of the image can be defined. In addition, light reflected at the interface between the side surface 11a and the diffraction grating portion 12a and reaching the back surface 11b can be efficiently reflected to the side surface 11c, and the outgoing light L radiated to the outside from the diffraction grating portion 12c can be increased4The strength of (2).
Although fig. 4 shows an example in which the reflective film 16 is formed only on the rear surface 11b, the reflective film 16 is preferably formed on all surfaces of the light guide unit 11 other than the light incident surface 11i on which the diffraction grating portions 12a to 12c are not formed.
(third embodiment)
Next, a third embodiment of the present invention will be described with reference to fig. 5. Description of the overlapping contents with the first embodiment will be omitted. Fig. 5 is a schematic plan view showing the structure of the optical element 10 in the present embodiment. The present embodiment is different from the first embodiment in that light is incident into the light guide unit 11 in two systems, and the diffraction grating units are formed on all side surfaces.
As shown in fig. 5, in the optical element 10 of the present embodiment, diffraction grating portions 12d and 12e are also formed on the surfaces of the side surfaces 11d and 11e that are orthogonal to the side surfaces 11a and 11 c. Two prisms 13a and 13b are arranged near the light incident surface 11 i. The prisms 13a and 13b are optical members each having a triangular cross section, and are arranged so that the ridge directions are orthogonal to each other.
In the image display device of the present embodiment, two light sources 15 are prepared, and the prisms 13a and 13b of the optical element 10 are irradiated with light. Here, the prism is arranged in the light incident surface 11iThe regions 13a and 13b into which collimated light is incident correspond to the first light incident portion and the second light incident portion in the present invention, respectively. The light entering the light guide unit 11 through the prism 13a is output as output light L from the diffraction grating units 12a, 12b, and 12c as described in fig. 22、L3、L4Irradiating in three directions. Similarly, the light entering the light guide unit 11 through the prism 13b reaches the side surface 11d, and a part of the light enters the diffraction grating unit 12d, and the other part is reflected as reflected light in the light guide unit 11. The light reflected by the side surface 11d is reflected again by the back surface 11b and reaches the side surface 11e, and a part of the light enters the diffraction grating section 12 e. The light incident on the diffraction grating parts 12d and 12e is used as the outgoing light L5、L6The light is emitted in a direction that satisfies the diffraction condition defined by the convex and concave portions, as in the first embodiment.
In the optical element 10 of the present embodiment, the diffraction grating portion 12a, which is reached first by the light entering the light guide portion 11 through the prism 13a, is different from the diffraction grating portion 12d, which is reached first by the light entering the light guide portion 11 through the prism 13 b. The side surface 11a on which the diffraction grating 12a is formed is orthogonal to the side surface 11d on which the diffraction grating 12d is formed. Thus, the light incident from the prism 13a and the light incident from the prism 13b are externally irradiated from the diffraction grating sections 12a, 12b, and 12c and the diffraction grating sections 12d and 12e, respectively, via different paths in the light guide section 11.
In the image display device using the optical element 10 of the present embodiment, images can be projected in five directions of the side surfaces 11a, 11c, 11d, and 11e and the rear surface 11b perpendicular to the light incident surface 11 i. When applied to the vehicle 100, the emitted light L is directed to the front, the center lower side, and the rear side as shown in fig. 32、L3、L4In addition, the light emitting device can emit light L directed to the side5、L6And projecting the image to the left and right side windows.
As described above, the optical element 10 and the image display device of the present embodiment can be reduced in size and weight, and can simultaneously project images in five directions at most, that is, in a plurality of directions.
(fourth embodiment)
Next, a fourth embodiment of the present invention will be explained. Description of the overlapping contents with the first embodiment will be omitted. In the first to third embodiments described above, the rectangular parallelepiped light guide portion is shown as the light guide portion 11, but the shape of the light guide portion 11 is not limited. For example, the rear surface 11b may not be parallel to the light incident surface 11i but may be inclined at a predetermined angle with respect to the light incident surface 11 i. The side surfaces 11a, 11c, 11d, and 11e may not be perpendicular to the light incident surface 11 i.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.
The international application claims priority to japanese patent application No. 2019-072494, filed on 2019, 4, 5, and the entire contents of the japanese patent application No. 2019-072494 are incorporated by reference into the present international application.
The foregoing descriptions of specific embodiments of the present invention are presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise embodiments described. It will be apparent to those skilled in the art that various modifications and variations can be made in view of the above description.
Description of the reference numerals
Incident light of L1 …
L2-L6 … emergent light
10 … optical element
100 … vehicle
101 … front windshield
102 … rear window glass
11 … light directing part
11i … light incident surface
11a, 11c, 11d, 11e … side
11b … back side
12 a-12 e … diffraction grating part
13. 13a, 13b … prism
14 … collimating lens
15 … light source
16 … reflective film.
Claims (7)
1. An optical element, comprising:
a light guide portion having a light incident surface, a plurality of side surfaces perpendicular to the light incident surface, and a back surface opposite to the light incident surface; and
and a plurality of diffraction grating sections formed on surfaces of at least two or more surfaces selected from the side surfaces and the back surface.
2. The optical element according to claim 1, wherein a reflective film is formed on one of the side surface and the back surface on which the diffraction grating portion is not formed.
3. Optical element according to claim 1 or 2,
the light incident surface has a first light incident portion and a second light incident portion,
the first diffraction grating section, which is reached first by the first light incident from the first light incident section, is different from the second diffraction grating section, which is reached first by the second light incident from the second light incident section.
4. An optical element according to claim 3, wherein the first diffraction grating portion and the second diffraction grating portion are formed on the side surface.
5. The optical element according to any one of claims 1 to 4,
a prism is arranged on the light incident surface,
a gap is provided between the prism and the light incident surface.
6. The optical element according to any one of claims 1 to 5, wherein the diffraction grating portion is formed of a dielectric having a refractive index different from that of the light guide portion.
7. An image display apparatus, comprising:
an optical element according to any one of claims 1 to 6; and
a light source unit for irradiating the light incident surface with light,
a part of the light is reflected at an interface between the diffraction grating portion formed on the side surface and the light guide portion and reaches the other diffraction grating portions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019072494A JP7373292B2 (en) | 2019-04-05 | 2019-04-05 | Optical elements and image display devices |
| JP2019-072494 | 2019-04-05 | ||
| PCT/JP2020/013655 WO2020203642A1 (en) | 2019-04-05 | 2020-03-26 | Optical element and image display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113544569A true CN113544569A (en) | 2021-10-22 |
| CN113544569B CN113544569B (en) | 2024-02-13 |
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| CN202080019319.2A Active CN113544569B (en) | 2019-04-05 | 2020-03-26 | Optical element and image display device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7373292B2 (en) |
| CN (1) | CN113544569B (en) |
| WO (1) | WO2020203642A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195120A (en) * | 1997-03-28 | 1998-10-07 | 夏普株式会社 | Front lighting device and reflective liquid crystal display device equipped with the device |
| JPH11287993A (en) * | 1998-04-01 | 1999-10-19 | Shimada Precision Kk | Light guide plate for spot light source |
| JP2006228596A (en) * | 2005-02-18 | 2006-08-31 | Toppan Printing Co Ltd | Lighting system and liquid crystal display |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720321A (en) * | 1993-06-30 | 1995-01-24 | Nissan Motor Co Ltd | Display device |
| JP2010093078A (en) * | 2008-10-08 | 2010-04-22 | Hamamatsu Photonics Kk | Optical element, laser beam oscillation device, and laser beam amplifying device |
| CN102472862A (en) * | 2009-07-10 | 2012-05-23 | 皇家飞利浦电子股份有限公司 | Free form lighting module |
| US8944662B2 (en) * | 2012-08-13 | 2015-02-03 | 3M Innovative Properties Company | Diffractive luminaires |
| US9857523B2 (en) * | 2014-11-24 | 2018-01-02 | Electronics And Telecommunications Research Institute | Apparatus for controlling light beam path |
-
2019
- 2019-04-05 JP JP2019072494A patent/JP7373292B2/en active Active
-
2020
- 2020-03-26 CN CN202080019319.2A patent/CN113544569B/en active Active
- 2020-03-26 WO PCT/JP2020/013655 patent/WO2020203642A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195120A (en) * | 1997-03-28 | 1998-10-07 | 夏普株式会社 | Front lighting device and reflective liquid crystal display device equipped with the device |
| JPH11287993A (en) * | 1998-04-01 | 1999-10-19 | Shimada Precision Kk | Light guide plate for spot light source |
| JP2006228596A (en) * | 2005-02-18 | 2006-08-31 | Toppan Printing Co Ltd | Lighting system and liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020203642A1 (en) | 2020-10-08 |
| JP7373292B2 (en) | 2023-11-02 |
| CN113544569B (en) | 2024-02-13 |
| JP2020170125A (en) | 2020-10-15 |
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