WO2022138326A1 - 導光板 - Google Patents
導光板 Download PDFInfo
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- WO2022138326A1 WO2022138326A1 PCT/JP2021/046035 JP2021046035W WO2022138326A1 WO 2022138326 A1 WO2022138326 A1 WO 2022138326A1 JP 2021046035 W JP2021046035 W JP 2021046035W WO 2022138326 A1 WO2022138326 A1 WO 2022138326A1
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- WO
- WIPO (PCT)
- Prior art keywords
- glass plate
- light guide
- guide plate
- resin layer
- less
- Prior art date
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- 239000011521 glass Substances 0.000 claims abstract description 104
- 239000011347 resin Substances 0.000 claims abstract description 73
- 229920005989 resin Polymers 0.000 claims abstract description 73
- 238000002834 transmittance Methods 0.000 claims description 25
- 230000003746 surface roughness Effects 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 abstract description 6
- 238000000149 argon plasma sintering Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 8
- 238000004017 vitrification Methods 0.000 description 8
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000004031 devitrification Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 210000001747 pupil Anatomy 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000005304 optical glass Substances 0.000 description 3
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 210000000695 crystalline len Anatomy 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 210000001525 retina Anatomy 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
-
- 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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B2005/1804—Transmission gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1847—Manufacturing methods
- G02B5/1852—Manufacturing methods using mechanical means, e.g. ruling with diamond tool, moulding
Definitions
- the present invention relates to a light guide plate used for eyeglass-type devices such as wearable devices for AR (augmented reality) / MR (mixed reality).
- eyeglass-type devices such as wearable devices for AR (augmented reality) / MR (mixed reality).
- the glasses-type device is a see-through type device that allows one to see an image displayed on a light guide plate of a glasses portion while looking at an outside view.
- the user can realize 3D display by displaying different images on the light guide plates corresponding to the left and right pupils of the user, or can connect the image to the retina using the crystalline lens of the pupil. It is also possible to project an image directly on the retina of the lens.
- a diffraction grating formed on the incident side surface on the light guide plate causes collimated light or laser light emitted from an image display element to be incident on the inside of the light guide plate, and the light is incident.
- a light guide plate a glass plate having a high refractive index and excellent rigidity is coated with a resin, and then a high-definition diffraction grating is formed by nanoimprint (see, for example, Patent Document 1).
- the image may not be projected with good color reproducibility.
- the light guide plate of the present invention is a light guide plate provided with a glass plate and a resin layer formed on the main surface of the glass plate, and the difference between the glass plate and the Abbe number ⁇ d of the resin layer is less than 10.
- the glass plate and the resin layer have a refractive index nd of 1.7 or more and a difference of 1.0 or less.
- the light guide plate of the present invention includes a glass plate and a resin layer, each of which has a refractive index corresponding to each material.
- the difference in refractive index between the glass plate and the resin layer is small, light scattering at the interface between the two can be suppressed.
- the difference in refractive index may differ depending on the wavelength. For example, at one wavelength, the difference in refractive index between the glass plate and the resin layer is small, and even if light scattering at the interface between the two can be suppressed, at another wavelength, the difference in refractive index between the glass plate and the resin layer is large, and both Light scattering at the interface of the above may be large.
- the present inventor focused on the Abbe number ⁇ d, which is an index of the refractive index wavelength dependence, and found that the above problem can be solved by reducing the difference between the Abbe number ⁇ d of the glass plate and the resin layer as described above. .. Specifically, if the difference between the Abbe number ⁇ d of the glass plate and the resin layer is made small, the difference in the slopes of the refractive index wavelength dependence curves between the two becomes small, so that the variation in the refractive index difference at each wavelength becomes small. As a result, light scattering at the interface between the two at each wavelength can be suppressed. Thereby, the color reproducibility of the image can be improved.
- the difference in the refractive index nd between the glass plate and the resin layer is 1.0 or less, the difference in the refractive index between the glass plate and the resin layer becomes small, and the light scattering loss at the interface between the two becomes small. Is less likely to occur.
- the thickness of the glass plate is preferably 0.1 to 1 mm, and the thickness of the resin layer is preferably 1 ⁇ m or less.
- the intensity of the light incident on the light guide plate is reduced mainly by the loss due to light scattering caused by the difference in refractive index at the interface between the glass plate and the resin layer and the loss due to absorption inside the glass plate or the resin layer.
- the thickness of the glass plate or the resin layer is small, the absorption loss inside the glass plate or the resin layer tends to be small, and the influence of the light scattering loss at the interface between the glass plate and the resin layer tends to be relatively large. Therefore, when the thickness of the glass plate or the resin layer is small as described above, the effect of the present invention can be easily enjoyed.
- the light guide plate of the present invention preferably has an internal transmittance of 70% or more at a wavelength of 450 to 650 nm with a glass plate thickness of 10 mm. By doing so, the absorption loss when the light is guided inside the glass plate is reduced, and the emitted light intensity can be increased.
- the light guide plate of the present invention preferably has a difference in external transmittance of 5% or less at wavelengths of 450 nm and 650 nm. By doing so, the variation of the light emission intensity from the light guide plate according to the wavelength becomes small, and the color reproducibility of the image is easily improved.
- the light guide plate of the present invention preferably has a surface roughness Ra of the main surface of the glass plate of 5 nm or less. By doing so, when light is reflected between the main surfaces of the glass plate and guided, light scattering loss on the main surface of the glass plate can be suppressed, and the emission light intensity can be increased.
- the light guide plate of the present invention preferably has an uneven structure formed on the surface of the resin layer.
- the resin layer functions as a diffraction grating, and light from the outside can be incident on the inside of the glass plate, and light inside the glass plate can be emitted to the outside.
- the resin layer is made of a photocurable resin. By doing so, it is possible to easily obtain an uneven structure having a nano-order shape.
- the AR / MR wearable device of the present invention is characterized by being provided with any of the above light guide plates.
- a light guide plate capable of enhancing the color reproducibility of an image when used as a light guide plate of a glasses-type device such as an AR / MR wearable device.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of the light guide plate of the present invention.
- the light guide plate 10 includes a glass plate 1 and a resin layer 2.
- the resin layer 2 is composed of resin layers 2a and 2b, each of which is formed on one main surface of the glass plate 1. Specifically, the resin layer 2a is formed on the surface of the light incident portion of the glass plate 1, and the resin layer 2b is formed on the surface of the light emitting portion of the glass plate 1.
- Concavo-convex structures are formed on the surfaces of the resin layers 2a and 2b, thereby functioning as a diffraction grating.
- the light emitted from the image display element (not shown) is incident on the light guide plate 10 as incident light L1.
- the incident light L 1 is diffracted by the resin layer 2a and incident inside the glass plate 1.
- the incident light L 1 is guided through the inside of the glass plate 1 to the light emitting portion while being totally reflected between both main surfaces of the glass plate 1.
- the incident light L 1 is diffracted by the resin layer 2b formed in the light emitting portion, is emitted to the outside of the glass plate 1 as the emitted light L 2 , and is incident on the human pupil. In this way, the image projected from the image display element can be viewed. Further, since the light guide plate 1 itself is transparent and see-through type, the outside scenery can be seen at the same time through the light guide plate 1.
- the incident light L 1 and the emitted light L 2 are visible light, for example, light having a wavelength in the range of 400 to 800 nm.
- the refractive index (nd) of the glass plate 1 is 1.7 or more, preferably 1.8 or more, 1.9 or more, 1.95 or more, and particularly preferably 1.98 or more.
- the upper limit of the refractive index of the glass plate 1 is preferably 2.1 or less, 2.05 or less, 2.03 or less, and particularly preferably 2.01 or less. If the refractive index of the glass plate 1 is too low, the viewing angle (FOV) tends to be narrow when used as a light guide plate for an AR / MR wearable device or the like. On the other hand, if the refractive index is too high, defects such as devitrification and veining occur, and the internal transmittance tends to decrease.
- the Abbe number of the optical glass 1 is not particularly limited, but since most Abbe numbers of resins having a refractive index of 1.7 or more are 30 or less, the optical glass 1 has an Abbe number difference from that of the resin layer 2.
- the lower limit of the Abbe number is preferably 20 or more, 22 or more, particularly 25 or more, and the upper limit is preferably 30 or less, particularly 28 or less.
- the thickness of the glass plate 1 is preferably 0.1 mm or more, 0.15 mm or more, particularly 0.2 mm or more, and preferably 1 mm or less, 0.5 mm or less, 0.4 mm or less, and particularly preferably 0.3 mm or less. .. If the thickness of the glass plate 1 is too small, the mechanical strength tends to decrease. On the other hand, if the thickness of the glass plate 1 is too large, the weight of the wearable device using the glass plate 1 becomes large, and the discomfort when the device is attached tends to increase.
- the length of the major axis (diagonal in the case of a rectangle) of the main surface of the glass plate 1 is preferably 100 mm or less, 80 mm or less, and particularly preferably 50 mm or less. In this way, the wearable device can be miniaturized.
- the lower limit is not particularly limited, but in reality, it is 10 mm or more, particularly 300 mm or more.
- the optical path length when light is waveguideed inside the glass plate 1 becomes shorter and the internal absorption loss becomes smaller, and the glass plate 1 and the resin layer become smaller.
- the influence of light scattering loss at the interface of 2 tends to be relatively large. Therefore, when the thickness of the glass plate 1 is small as described above, the effect of the present invention can be easily enjoyed.
- the internal transmittance of the glass plate 1 at a wavelength of 450 to 650 nm at a thickness of 10 mm is preferably 70% or more, 80% or more, 90% or more, and particularly preferably 95% or more. By doing so, it is possible to suppress the absorption loss when the light is guided inside the glass plate 1, and it is possible to increase the intensity of the emitted light.
- the surface roughness Ra of the first main surface 1a and the second main surface 1b of the glass plate 1 is preferably 5 nm or less, 3 nm or less, and particularly preferably 2 nm or less. If the surface roughness Ra of the first main surface 1a and the second main surface 1b of the glass plate 1 is too large, scattering loss occurs when the light incident inside the glass plate 1 is repeatedly wave-guided by total internal reflection. It is easy to obtain a bright and clear image.
- the lower limit of the surface roughness Ra of the first main surface 1a and the second main surface 1b of the glass plate 1 is not particularly limited, but is practically 0.1 nm or more.
- the glass plate 1 preferably contains SiO 2 and B 2 O 3 , which are components that improve the stability of vitrification, and La 2 O 3 and Nb 2 O 5 , which are components that increase the refractive index, as the glass composition. .. By containing these components, it becomes easy to obtain glass having a high refractive index and excellent mass productivity.
- SiO 2 is effective for vitrification, but is a component that greatly lowers the refractive index. Therefore, the content of SiO 2 is preferably 1 to 45%, particularly preferably 3 to 35%.
- B 2 O 3 is effective for vitrification, but since it is a component that increases the Abbe number, if the content is too large, it becomes difficult to obtain a desired Abbe number (for example, 30 or less). Therefore, the content of B 2 O 3 is preferably 10% or less, particularly preferably 9.5% or less.
- the lower limit is not particularly limited, but in order to improve the stability of vitrification, it is preferably 1% or more, particularly 2% or more.
- the content of SiO 2 + B 2 O 3 is preferably 1 to 55%, particularly preferably 5 to 40%.
- x + y + Means the total amount of each component.
- La 2 O 3 is a component that significantly increases the refractive index and improves the stability of vitrification.
- the content of La 2 O 3 is preferably 0 to 60%, 10 to 55%, 20 to 52%, and particularly preferably 30 to 50%. If the content of La 2 O 3 is too large, the devitrification resistance tends to decrease and the mass productivity tends to be inferior.
- Nb 2 O 5 is a component that significantly increases the refractive index. It also has the effect of reducing the Abbe number.
- the content of Nb 2 O 5 is preferably 0 to 40%, 3 to 40%, and particularly preferably 5 to 39%.
- the content of La 2 O 3 + Nb 2 O 5 is preferably 20 to 70%, particularly preferably 30 to 65%.
- Gd 2 O 3 , Y 2 O 3 or Yb 2 O 3 can be contained as a component for increasing the refractive index.
- Gd 2 O 3 can be contained in a high amount in glass like La 2 O 3 , but if it is too much, the glass density becomes high. In addition, it becomes easy to devitrify. Therefore, the content of Gd 2 O 3 is preferably 0 to 20%, particularly preferably 1 to 10%.
- Y 2 O 3 and Y b 2 O 3 are each preferably 0 to 10%, particularly preferably 0.1 to 8%. If the content of these components is too high, devitrification is likely to occur.
- Ln 2 O 3 is at least one selected from La, Gd, Y and Yb
- a desired high refractive index for example, 1.7 or more, 1.8 or more, and even 1
- the content of Ln 2 O 3 is preferably 40 to 65%, 45 to 63%, and particularly preferably 48 to 60%.
- TiO 2 and ZrO 2 that contribute to the improvement of the refractive index are contained.
- TiO 2 is a component that increases the refractive index and decreases the Abbe number.
- the content of TiO 2 is preferably 5 to 40%, particularly preferably 10 to 30%. If the content of TiO 2 is too small, it becomes difficult to obtain the above effect. On the other hand, if the content of TiO 2 is too large, the transmittance is lowered and vitrification becomes unstable.
- ZrO 2 is also a component that increases the refractive index and decreases the Abbe number.
- the content of ZrO 2 is preferably 1 to 10%, particularly preferably 3 to 8%. If the content of ZrO 2 is too small, it becomes difficult to obtain the above effect. On the other hand, if the content of ZrO 2 is too large, the transmittance is lowered and vitrification becomes unstable.
- the total amount of alkali metal component (Li 2 O, Na 2 O or K 2 O), alkaline earth metal component (MgO, CaO, SrO or BaO) or ZnO is 0. It can contain up to 30%.
- the alkali metal component can be contained for the purpose of adjusting the refractive index and the Abbe number. Specifically, the alkali metal component tends to reduce the refractive index and Abbe number.
- the content of the alkaline component is preferably 0 to 20%.
- Sb 2 O 3 can be contained in a range of 0.1% or less for the purpose of clarification and improvement of transmittance.
- the As component (As 2 O 3 etc.), the Pb component (PbO etc.) and the fluorine component (F 2 etc.) are substantially not contained because of the large environmental load. Further, Bi 2 O 3 and Te O 2 are coloring components, and the transmittance in the visible region tends to decrease. Therefore, it is preferable that Bi 2 O 3 and Te O 2 are not substantially contained.
- substantially not contained means that it is intentionally not contained as a raw material, and does not exclude the inclusion of unavoidable impurities. Objectively, it means that the content of each of the above components is less than 0.1%.
- a plurality of glass plates 1 may be laminated and used as a laminated body. By doing so, when the glass plate 1 is used as a light guide plate of a wearable device, it becomes possible to superimpose and project an image in the depth direction of the display screen, and a 3D image can be obtained.
- the number of laminated sheets is preferably 3 or more, particularly preferably 6 or more.
- the refractive index (nd) of the resin layer 2 is 1.7 or more, preferably 1.8 or more, 1.9 or more, 1.95 or more, and particularly preferably 1.98 or more.
- the upper limit of the refractive index of the resin layer 2 is preferably 2.1 or less, 2.05 or less, 2.03 or less, and particularly preferably 2.01 or less. By doing so, the difference in the refractive index from the glass plate 1 becomes small, and light scattering loss at the interface between the glass plate 1 and the resin layer 2 is less likely to occur.
- the difference in the refractive index (nd) between the glass plate 1 and the resin layer 2 is 1.0 or less, preferably 0.5 or less, 0.3 or less, 0.2 or less, and particularly preferably 0.15 or less. By doing so, the difference in the refractive index from the glass plate 1 becomes small, and light scattering loss at the interface between the glass plate 1 and the resin layer 2 is less likely to occur.
- the Abbe number of the resin layer 2 is preferably 10 or more, 15 or more, 20 or more, particularly 25 or more, and the upper limit is 45 or less, 40 or less, in consideration of the Abbe number difference from the optical glass 1. It is preferably 35 or less, particularly preferably 30 or less.
- the difference in Abbe number ( ⁇ d) between the glass plate 1 and the resin layer 2 is less than 10, preferably 8 or less, 5 or less, and particularly preferably 3 or less. By doing so, it is possible to suppress light scattering at the interface between the glass plate 1 and the resin layer 2 at each wavelength for the above-mentioned reason, and it is possible to improve the color reproducibility of the image.
- the difference in the external transmittance (transmittance including the reflection loss) at the wavelengths of 450 nm and 650 nm of the light guide plate 10 which is a laminate of the glass plate 1 and the resin layer 2 can be mentioned.
- the difference in external transmittance between the wavelengths of 450 nm and 650 nm of the light guide plate 10 is preferably 5% or less, 4% or less, 3% or less, and particularly preferably 2.5% or less.
- the thickness of the resin layer 2 is preferably 5 ⁇ m or less, 1 ⁇ m or less, and particularly preferably 0.5 ⁇ m or less. If the thickness of the resin layer 2 is too large, the light absorption becomes large, and the intensity of the emitted light from the light guide plate 10 tends to decrease.
- the lower limit of the thickness of the resin layer 2 is not particularly limited, but is preferably 0.01 ⁇ m or more, particularly 0.1 ⁇ m or more in order to form a desired uneven structure on the surface. The smaller the thickness of the resin layer 2, the smaller the absorption loss inside the resin layer 2, and the more the influence of the light scattering loss at the interface between the glass plate 1 and the resin layer 2 tends to be relatively large. Therefore, when the thickness of the resin layer 2 is small as described above, the effect of the present invention can be easily enjoyed.
- the height thereof may be appropriately set so as to obtain a desired diffractive capacity.
- the height of the uneven structure can be 0.01 to 0.2 ⁇ m, and further can be 0.03 to 0.1 ⁇ m.
- the resin layer 2 is preferably a photocurable resin. By doing so, it is possible to easily obtain an uneven structure having a nano-order shape.
- Table 1 shows Examples (No. 1 to 3) and Comparative Examples (No. 4) of the present invention.
- Table 2 shows the compositions of the glass plates used in Examples and Comparative Examples.
- the difference in external transmittance depending on the wavelength was evaluated for the light guide plate having the characteristics and compositions shown in Tables 1 and 2 and having a resin layer formed on the surface of the glass plate. Specifically, the difference in external transmittance at each wavelength of 450 nm and 650 nm of the light guide plate was measured.
- the glass plate is prepared by blending raw materials so as to have the composition shown in Table 2, melting and casting at 1250 to 1400 ° C. in an atmosphere using a platinum crucible to obtain a glass molded product, and then the glass molded product. Was produced by cutting and polishing.
- FIG. 2 shows the external transmittance curve of the light guide plate of Example 2.
- FIG. 2 also shows the external transmittance curve of the glass plate used in Example 2 for reference.
- the surface roughness Ra of the glass plate was measured using an AFM Dimension Icon manufactured by Bruker with a scan size of 10 ⁇ m and a scan speed of 1 Hz.
- the refractive index of the glass plate was measured as follows. A glass plate having a thickness of 0.3 mm is cut at right angles or polished at right angles, and the cut surface or the polished surface is mirror-polished with # 1000 polishing paper. The two sheets were pasted together and measured using KPR-2000 manufactured by Shimadzu Corporation. Further, the Abbe number was calculated from the refractive indexes of the obtained d-line, C-line, and F-line wavelengths.
- the internal transmittance of the glass plate was measured as follows. From the glass molded body produced by the above method, a glass plate having a size of 10 ⁇ 10 mm or more and a thickness of 10 mm and a glass plate having a thickness of 3 mm were produced, and they were mirror-polished with # 1000 polishing paper or cerium polishing powder. For these glass plates, the internal transmittance including no reflection loss was obtained from the transmittance obtained by measuring with UV-3100 manufactured by Shimadzu Corporation.
- the refractive index of the resin was measured using an ellipsometer EF-5000 manufactured by Otsuka Electronics. Further, the Abbe number was calculated from the refractive indexes of the obtained d-line, C-line, and F-line wavelengths.
- the transmittance of the light guide plate having a resin layer formed on the surface of the glass plate was measured using UV-3100 manufactured by Shimadzu Corporation.
- No. 1 which is an example.
- the difference in Abbe number between the glass plate and the resin layer was as small as 8 or less, and the difference in transmittance at each wavelength of 450 nm and 650 nm was as small as 2%. Therefore, it is considered that the color reproducibility is high when used as a light guide plate for an AR / MR wearable device.
- the difference in Abbe number between the glass plate and the resin layer was as large as 11, and the difference in transmittance at each wavelength of 450 nm and 650 nm was as large as 7%. Therefore, it is considered that the color reproducibility is inferior when used as a light guide plate for an AR / MR wearable device.
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Abstract
Description
また本発明の導光板は、ガラス板と樹脂層の屈折率ndの差が1.0以下であるため、ガラス板と樹脂層の屈折率差が小さくなって、両者の界面での光散乱ロスが生じ難くなる。
ガラス板1の屈折率(nd)は1.7以上であり、1.8以上、1.9以上、1.95以上、特に1.98以上であることが好ましい。一方、ガラス板1の屈折率の上限は2.1以下、2.05以下、2.03以下、特に2.01以下であることが好ましい。ガラス板1の屈折率が低すぎると、AR/MR用ウェアラブルデバイス等の導光板として使用した場合に、視野角(FOV)が狭くなる傾向がある。一方、屈折率が高すぎると、失透や脈理等の欠陥が発生し、内部透過率が低下しやすくなる。
樹脂層2の屈折率(nd)は1.7以上であり、1.8以上、1.9以上、1.95以上、特に1.98以上であることが好ましい。一方、樹脂層2の屈折率の上限は2.1以下、2.05以下、2.03以下、特に2.01以下であることが好ましい。このようにすれば、ガラス板1との屈折率差が小さくなって、ガラス板1と樹脂層2の界面での光散乱ロスが生じ難くなる。
Claims (8)
- ガラス板と、ガラス板の主面に形成された樹脂層と、を備えた導光板であって、
ガラス板及び樹脂層のアッベ数νdの差が10未満であり、
ガラス板及び樹脂層の屈折率ndが1.7以上、かつ、差が1.0以下であることを特徴とする導光板。 - ガラス板の厚みが0.1~1mm、樹脂層の厚みが1μm以下であることを特徴とする請求項1に記載の導光板
- ガラス板の厚み10mmでの波長450~650nmにおける内部透過率が70%以上であることを特徴とする請求項1または2に記載の導光板。
- 波長450nmと650nmにおける外部透過率の差が5%以下であることを特徴とする請求項1~3のいずれか一項に記載の導光板。
- ガラス板の主面の表面粗さRaが5nm以下であることを特徴とする請求項1~4のいずれか一項に記載の導光板。
- 樹脂層の表面に凹凸構造が形成されていることを特徴とする請求項1~5のいずれか一項に記載の導光板。
- 樹脂層が光硬化樹脂からなることを特徴とする請求項1~6のいずれか一項に記載の導光板。
- 請求項1~7のいずれか一項に記載された導光板を備えてなることを特徴とするAR/MR用ウェアラブルデバイス。
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DE112021006585.8T DE112021006585T5 (de) | 2020-12-21 | 2021-12-14 | Lichtleitplatte |
CN202180083957.5A CN116583767A (zh) | 2020-12-21 | 2021-12-14 | 导光板 |
US18/267,942 US20240103226A1 (en) | 2020-12-21 | 2021-12-14 | Light guide plate |
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JP2020210992A JP2022097824A (ja) | 2020-12-21 | 2020-12-21 | 導光板 |
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KR20140136145A (ko) * | 2013-05-20 | 2014-11-28 | 충북대학교 산학협력단 | 포토폴리머를 이용한 풀 컬러 홀로그래픽 광학소자 및 이의 제조방법과, 표시장치 |
WO2017038350A1 (ja) * | 2015-09-02 | 2017-03-09 | ソニー株式会社 | 光学装置及びその製造方法並びに表示装置 |
US20200264434A1 (en) * | 2018-12-26 | 2020-08-20 | Lg Electronics Inc. | Electronic device |
US20200292818A1 (en) * | 2017-10-16 | 2020-09-17 | Oorym Optics Ltd. | Highly efficient compact head-mounted display system |
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JP7096084B2 (ja) | 2018-07-02 | 2022-07-05 | 株式会社日立エルジーデータストレージ | 導光板、導光板モジュール、画像表示装置および導光板の製造方法 |
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2020
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2021
- 2021-12-14 US US18/267,942 patent/US20240103226A1/en active Pending
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- 2021-12-14 DE DE112021006585.8T patent/DE112021006585T5/de active Pending
- 2021-12-14 CN CN202180083957.5A patent/CN116583767A/zh active Pending
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KR20140136145A (ko) * | 2013-05-20 | 2014-11-28 | 충북대학교 산학협력단 | 포토폴리머를 이용한 풀 컬러 홀로그래픽 광학소자 및 이의 제조방법과, 표시장치 |
WO2017038350A1 (ja) * | 2015-09-02 | 2017-03-09 | ソニー株式会社 | 光学装置及びその製造方法並びに表示装置 |
US20200292818A1 (en) * | 2017-10-16 | 2020-09-17 | Oorym Optics Ltd. | Highly efficient compact head-mounted display system |
US20200264434A1 (en) * | 2018-12-26 | 2020-08-20 | Lg Electronics Inc. | Electronic device |
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JP2022097824A (ja) | 2022-07-01 |
DE112021006585T5 (de) | 2023-10-05 |
CN116583767A (zh) | 2023-08-11 |
US20240103226A1 (en) | 2024-03-28 |
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