Hologram optical member, hologram screen, and display device

Abstract

This hologram optical member is provided with: a hologram layer; a substrate comprising a resin material; and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer including an organic-based material and having higher hardness than the substrate.

Description

Holographic optical element, holographic screen, and display device

[0001] The present disclosure relates to a holographic optical element having a holographic layer, a holographic screen, and a display device.

[0002] A display device using a cylindrical holographic screen has been proposed (see Patent Document 1). Meanwhile, a technology has been proposed for a holographic optical element having a substrate and a holographic layer, in which the surfaces of the substrate and the holographic layer are coated with room-temperature glass to improve performance such as moisture resistance and abrasion resistance (see Patent Document 2).

[0003] International Publication No. 2018 / 163945 JP 6-258996

[0004] The technology of coating with room temperature glass is difficult to apply to cylindrical holographic screens and the like due to problems such as hardness and brittleness.

[0005] It is desirable to provide a holographic optical element, a holographic screen, and a display device that are highly environmentally resistant.

[0006] A hologram optical element according to one embodiment of the present disclosure includes a hologram layer, a substrate made of a resin material, and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer containing an organic material, and having a higher hardness than the substrate.

[0007] A hologram screen according to one embodiment of the present disclosure includes a hologram layer, a substrate made of a resin material, and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer containing an organic material, and having a higher hardness than the substrate.

[0008] A display device according to one embodiment of the present disclosure includes a hologram screen that displays an image, the hologram screen including a hologram layer, a substrate made of a resin material, and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer including an organic material, and having a higher hardness than the substrate.

[0009] In the holographic optical member, holographic screen, or display device according to an embodiment of the present disclosure, a hard coat layer containing an organic material is disposed between the holographic layer and the substrate.

[0010] FIG. 1 is a cross-sectional view showing a configuration example of a hologram optical element according to a comparative example. FIG. 2 is a cross-sectional view showing a first configuration example of a hologram optical element according to the first embodiment of the present disclosure. FIG. 3 is a characteristic diagram showing an example of the diffraction characteristics of a hologram optical element according to a comparative example. FIG. 4 is a characteristic diagram showing an example of the diffraction characteristics of a hologram optical element according to the first configuration example of the first embodiment. FIG. 5 is an explanatory diagram showing a comparison of various characteristics of room temperature glass and an organic hard coat. FIG. 6 is a cross-sectional view showing a second configuration example of a hologram optical element according to the first embodiment. FIG. 7 is a characteristic diagram showing an example of the diffraction characteristics of a hologram optical element according to a comparative example. FIG. 8 is a characteristic diagram showing an example of the diffraction characteristics of a hologram optical element according to the second configuration example of the first embodiment. FIG. 9 is a characteristic diagram showing an example of measurement results of a 90° peel test performed on a hologram optical element according to the second configuration example of the first embodiment. FIG. 10 is a characteristic diagram showing a comparison of various characteristics due to differences in materials for the OCA layer. FIG. 11 is a characteristic diagram showing a comparison of diffraction characteristics due to differences in materials for the OCA layer. FIG. 12 is a cross-sectional view showing a third configuration example of a hologram optical element according to the first embodiment. FIG. 13 is a cross-sectional view showing a configuration example of a display device according to the first embodiment. FIG. 14 is a cross-sectional view showing a main part of a configuration example of a hologram screen according to a comparative example. 1 is a cross-sectional view showing a main part of a configuration example of a hologram screen according to a first embodiment.

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order: 0. Comparative Example (FIG. 1) 1. First Embodiment 1.1 Configuration and Function of Holographic Optical Element 1.1.1 Holographic Optical Element with Hard Coat Layer (FIGS. 2 to 5) 1.1.2 Holographic Optical Element with Optically Transparent Adhesive Layer (FIGS. 6 to 12) 1.2 Application Example to Display Device (FIGS. 13 to 15) 1.3 Effects 2. Other Embodiments

[0012] <0. Comparative Example> (Overview and Problems of a Hologram Optical Element According to a Comparative Example) FIG. 1 shows an example of the configuration of a hologram optical element according to a comparative example.

[0013] A basic configuration of a holographic optical member is, for example, a configuration in which a HOE (Holographic Optical Element) layer 2 is laminated as a hologram layer on a substrate 1 made of a resin material.

[0014] Meanwhile, display devices using holographic screens with high transparency and brightness have been developed. For example, a display device has been proposed that uses a cylindrical holographic screen as an object to be irradiated with projection light, thereby enabling image display around the entire periphery of the holographic screen (see Patent Document 1).

[0015] When a hologram screen has a configuration similar to that of the hologram optical element according to the comparative example shown in FIG. 1 , stress due to thermal expansion and contraction of the substrate 1 is applied to the HOE layer 2. While this is true for a typical flat hologram screen, in a cylindrical hologram screen, the stress due to thermal expansion and contraction of the substrate 1 is applied to the HOE layer 2 to a greater extent. As a result, it becomes difficult to ensure reliability due to the loads of the actual usage environment. For example, the thermal expansion and contraction of the substrate 1 can cause peeling of the HOE layer 2, resulting in poor appearance and a reduction in design. Furthermore, this can lead to deterioration of diffraction characteristics, making it difficult for the hologram screen to properly diffract projected light, making it difficult to achieve a bright display.

[0016] To address this issue, there is a technology in which the surfaces of the substrate 1 and the HOE layer 2 are coated with room-temperature glass (see Patent Document 2). A substrate 1 made of a resin material has lower moisture resistance, abrasion resistance, and solvent resistance than a glass substrate. Therefore, moisture or organic solvents may penetrate the HOE layer 2 attached to the substrate 1, potentially causing the hologram recorded in the HOE layer 2 to be lost. Therefore, this issue is resolved by coating the substrate 1, the HOE layer 2, and an adhesive (not shown) with room-temperature glass.

[0017] However, the technology of coating with room-temperature glass is prone to cracking due to the hardness and brittleness of room-temperature glass, making it difficult to apply to cylindrical hologram screens, etc. In particular, when attempting to use it on a substrate 1 made of a resin material, the difference in linear expansion between room-temperature glass and the resin material makes it more susceptible to cracking at high temperatures.

[0018] 1. First Embodiment [1.1 Configuration and Function of Hologram Optical Element] [1.1.1 Hologram Optical Element with Hard Coat Layer] FIG. 2 shows a first configuration example of a hologram optical element according to a first embodiment of the present disclosure.

[0019] The hologram optical element according to the first embodiment can be applied to, for example, a hologram screen, etc. The hologram optical element according to the first configuration example of the first embodiment includes a substrate 1, an HOE layer 2 as a hologram layer, and a hard coat layer 3 disposed between the hologram layer 2 and the substrate 1.

[0020] The substrate 1 is made of a resin material, for example, PMMA (Polymethyl Methacrylate), which is an acrylic resin.

[0021] The hard coat layer 3 is configured to have a higher hardness than the substrate 1. The hardness of the hard coat layer 3, in terms of pencil hardness, is preferably, for example, 4H or more and 6H or less. The pencil hardness of PMMA used as the material of the substrate 1 is 2H.

[0022] The hard coat layer 3 contains an organic material, for example, an acrylic resin, a silica liquid solution, and a UV curable resin.

[0023] In consideration of UV damage to the substrate 1 made of a resin material, a thermosetting resin may be used for the hard coat layer 3 instead of a UV curable resin. For example, the hard coat layer 3 may be configured to contain a polysiloxane resin and a thermosetting resin. Alternatively, the hard coat layer 3 may be configured to contain a silicone resin and a thermosetting resin. By using a thermosetting resin, light resistance can be improved and a longer life can be achieved.

[0024] The hard coat layer 3 can be formed by, for example, dip coating, bar coating, slit coating, etc. Depending on the formation method (for example, in the case of dip coating), the hard coat layer 3 may also be present on the surface of the substrate 1 opposite to the surface on which the HOE layer 2 is disposed (the lower surface of the substrate 1 in FIG. 2 ).

[0025] If the thickness of the hard coat layer 3 is, for example, 2 μm or more and 3 μm or less, it can function to enhance environmental resistance.

[0026] The HOE layer 2 has a structure in which, for example, a substrate made of polyamide and a photopolymer resin are laminated together, for example, in FIG. 2 , the substrate is laminated on the side opposite (upper side) from the substrate 1 and the hard coat layer 3, and the photopolymer resin is laminated on the side of the substrate 1 and the hard coat layer 3 (lower side).

[0027] As described above, since the hard coat layer 3 is located on the photopolymer resin side of the HOE layer 2 that functions as a hologram screen, it is possible to suppress deterioration of the diffraction characteristics of the HOE layer 2 even when subjected to the stresses of an actual usage environment.

[0028] When the surfaces of substrate 1 and HOE layer 2 are coated with room-temperature glass, as in the technology according to the comparative example described above, the difference in linear expansion between room-temperature glass and a resin material may cause thermal expansion and contraction of substrate 1, which may result in a loss of functionality of HOE layer 2. In particular, when the technology according to the comparative example is applied to a hologram screen with a highly curvature shape, such as a cylindrical hologram screen, it is not possible to follow the expansion and contraction caused by thermal expansion and contraction of substrate 1 made of a resin material, and even if there is some degree of followability to bending and flexing, it is thought that the hardness of the substrate makes it prone to cracking.

[0029] In contrast, the hard coat layer 3 uses an organic material, and therefore has affinity for the substrate 1 made of a resin material, and has good adhesion to the substrate 1. Optically, the refractive indexes of the hard coat layer 3 and the substrate 1 are similar, so Fresnel reflection is small. As a result, when applied to a hologram screen, loss of image light is small. The hard coat layer 3 does not require a primer and has a lower hardness than room-temperature glass, so it can follow the expansion and contraction of the substrate 1 made of a resin material and is less likely to crack. In addition, the low material cost and the lack of a primer make it cheaper than room-temperature glass.

[0030] Therefore, the hologram optical element according to the first configuration example can suppress poor appearance due to cracks and the like and deterioration of characteristics due to environmental loads in actual use. Furthermore, the hologram optical element according to the first configuration example can be said to be inexpensive, lightweight, and have a high degree of freedom in shape.

[0031] (Characteristics Example) Fig. 3 shows an example of the diffraction characteristics of a hologram optical element (without the hard coat layer 3) according to a comparative example. Fig. 4 shows an example of the diffraction characteristics of a hologram optical element (with the hard coat layer 3) according to the first configuration example of the first embodiment.

[0032] 3 and 4, the horizontal axis represents wavelength (nm) and the vertical axis represents relative diffraction efficiency (%). Figures 3 and 4 show the characteristics of the hologram optical element after a load of 60°C temperature and 90% humidity has been applied for a predetermined period of time (48 hours) and before the load was applied.

[0033] As can be seen from Fig. 3, the diffraction efficiency deteriorates due to the load in the configuration without the hard coat layer 3. In contrast, as can be seen from Fig. 4, the deterioration of the diffraction efficiency due to the load is suppressed in the configuration with the hard coat layer 3. In the configuration without the hard coat layer 3, the load tends to cause bubbles to form between the substrate 1 and the HOE layer 2, or peel off of the HOE layer 2.

[0034] FIG. 5 shows a comparison of various properties between room temperature glass and an organic hard coat.

[0035] FIG. 5 shows an example of an organic hard coat using an acrylic resin for the hard coat layer 3. Room-temperature glass conforms to the PMMA substrate 1 material by bending and flexing to a certain extent, but cannot conform to expansion. This results in cracks on the coating surface. To overcome this drawback and ensure adhesion, various primers (buffering materials) tailored to the material are required. Organic hard coats do not require a primer and can be applied in a single layer. Unlike inorganic materials, because they are organic, they can conform to the expansion and contraction of the resin and do not crack.

[0036] Regarding the degree of freedom of shape, room-temperature glass has a risk of cracking after coating, making it low. Coating an HOE film can crack when attached, so it must be thick or fixed. When applied to a cylindrical display device, it can bend and crack when placed upright, and may also crack if dropped. With an organic hard coat, cracking does not occur.

[0037] Regarding cost, cold glass requires a primer, which makes the material expensive: cold glass is more than twice as expensive as an acrylic organic hard coat.

[0038] [1.1.2 Hologram Optical Element Having Optically Transparent Adhesive Layer] FIG. 6 shows a second example of the configuration of the hologram optical element according to the first embodiment.

[0039] The holographic optical element according to the second configuration example of the first embodiment further includes an OCA (Optical Clear Adhesive) layer 4 in addition to the configuration of the holographic optical element according to the first configuration example (FIG. 2).

[0040] The OCA layer 4 is disposed between the HOE layer 2 and the hard coat layer 3. The OCA layer 4 contains, for example, a silicone-based adhesive. By providing the OCA layer 4, the adhesion between the HOE layer 2 and the hard coat layer 3 can be improved.

[0041] As described above, the provision of the hard coat layer 3 can suppress deterioration of optical properties due to loads in the actual use environment. The provision of the OCA layer 4 can further enhance environmental resistance over the long term.

[0042] By providing the OCA layer 4, peeling of the HOE layer 2 can be further suppressed. This makes it possible to maintain long-term visibility when applied to a hologram screen, suppressing appearance defects and maintaining design. The HOE layer 2 exhibits diffraction characteristics at a specific angle and wavelength (high angle selectivity and wavelength selectivity). Therefore, if peeling of the HOE layer 2 occurs, when applied to a hologram screen, the angle of incidence of light on the HOE layer 2 changes, resulting in a significant loss of display quality, such as an inability to display the desired image or a change in color. This can be suppressed by providing the OCA layer 4.

[0043] (Characteristics example) Fig. 7 shows an example of the diffraction characteristics of a hologram optical element according to a comparative example (without the hard coat layer 3 and the OCA layer 4). Fig. 8 shows an example of the diffraction characteristics of a hologram optical element according to a second configuration example of the first embodiment (with the hard coat layer 3 and the OCA layer 4).

[0044] 7 and 8, the horizontal axis represents wavelength (nm) and the vertical axis represents relative diffraction efficiency (%). Figures 7 and 8 show the characteristics of the hologram optical element after a load of 60°C temperature and 90% humidity has been applied for a predetermined period of time (48 hours) and before the load was applied.

[0045] As can be seen from Fig. 7, the diffraction efficiency deteriorates due to the load in the configuration without the hard coat layer 3 and the OCA layer 4. In contrast, as can be seen from Fig. 8, the deterioration of the diffraction efficiency due to the load is suppressed in the configuration with the hard coat layer 3 and the OCA layer 4.

[0046] FIG. 9 shows an example of the measurement results of a 90° peel test performed on a holographic optical element (having a hard coat layer 3 and an OCA layer 4) according to the second configuration example of the first embodiment.

[0047] In Figure 9, the horizontal axis represents the stroke (mm) and the vertical axis represents the test force (N / cm). Figure 9 also shows the measurement results of a 90° peel test on two samples (Sample 1 and Sample 2) with the same configuration. It was confirmed that the provision of the OCA layer 4 maintained a constant peel strength. It was also confirmed that the provision of the OCA layer 4 suppressed the occurrence of zipping and bubbling.

[0048] Fig. 10 shows a comparison of various characteristics resulting from different materials for the OCA layer 4. Fig. 11 shows a comparison of diffraction characteristics resulting from different materials for the OCA layer 4. In Fig. 11, the horizontal axis represents the load time (h) at a temperature of 60°C and humidity of 90%. The vertical axis represents the amount of change (%) in diffraction characteristics. Fig. 11 shows the characteristics when the hologram optical element has a curved surface shape.

[0049] Fig. 10 compares various characteristics depending on the material of the OCA layer 4, with and without the hard coat layer 3. Fig. 10 compares various characteristics when a silicone-based adhesive, a rubber-based adhesive, and an acrylic-based adhesive are used as the material of the OCA layer 4. Fig. 10 shows the evaluation of various characteristics on a three-level scale: A (Excellent), B (Average), and C (Poor).

[0050] Acrylic adhesives are not suitable as materials for the OCA layer 4 because their diffraction characteristics deteriorate under load regardless of whether a hard coat layer 3 is present. Rubber-based adhesives exhibit little deterioration in diffraction characteristics when the hologram optical element is flat. However, when the hologram optical element is curved, the initial characteristics deteriorate as shown in FIG. 11 . With rubber-based adhesives, the load curve remains inclined even after 260 hours (degradation does not saturate), and peeling and yellowing occur without a thermal process. In contrast, with silicone-based adhesives, degradation saturates at a low level and remains low even after 260 hours. For this reason, silicone-based adhesives are suitable as materials for the OCA layer 4.

[0051] FIG. 12 shows a third example of the configuration of the hologram optical member according to the first embodiment.

[0052] The hologram optical element (FIG. 6) according to the second configuration example may further include a functional sheet, such as an AR (Anti-Reflection) layer, to improve transparency and anti-fouling properties.

[0053] The hologram optical element according to the third configuration example of the first embodiment includes a substrate 10, a HOE layer 20, a first hard coat layer 31, and a first OCA layer 41. In terms of correspondence with the configuration of the hologram optical element shown in Fig. 6 , the substrate 10 corresponds to the substrate 1, the HOE layer 20 corresponds to the HOE layer 2, the first hard coat layer 31 corresponds to the hard coat layer 3, and the first OCA layer 41 corresponds to the OCA layer 4. The configurations of the substrate 10, the HOE layer 20, the first hard coat layer 31, and the first OCA layer 41 may be similar to the configurations of the corresponding parts of the hologram optical element shown in Fig. 6 .

[0054] The HOE layer 20 is composed of a substrate 21 made of, for example, polyamide, and a photopolymer resin 22. The substrate 21 is laminated on the side opposite (upper side of) the first OCA layer 41, and the photopolymer resin 22 is laminated on the side of (lower side of) the first OCA layer 41.

[0055] The hologram optical element according to the third configuration example further includes a second hard coat layer 32, a second OCA layer 51, a third OCA layer 52, a first AR layer 61, and a second AR layer 62.

[0056] The material of the second hard coat layer 32 may be the same as that of the first hard coat layer 31. The second hard coat layer 32 is provided on the opposite side (lower side) of the substrate 10 from the side (upper side) on which the first hard coat layer 31 is provided. A third OCA layer 52 and a second AR layer 62 are laminated in this order on the opposite side (lower side) of the second hard coat layer 32 from the side (upper side) on which the substrate 10 is provided. The third OCA layer 52 is made of, for example, an acrylic adhesive for preventing foaming.

[0057] A second OCA layer 51 and a first AR layer 61 are laminated in this order on the side (upper side) opposite to the side (lower side) on which the first OCA layer 41 is provided with respect to the HOE layer 20 .

[0058] [1.2 Example of Application to Display Device] FIG. 13 shows an example of the configuration of a display device according to the first embodiment.

[0059] The display device according to the first embodiment includes a cylindrical screen 100 and a base 110 .

[0060] An image light generating unit 111 and a projection optical system 112 are provided inside the base 110. The base 110 has a cylindrical shape and is provided below the cylindrical screen 100.

[0061] A reflecting mirror 120 is provided on the top of the cylindrical screen 100. The cylindrical screen 100 is a cylindrical holographic screen that displays an image.

[0062] The image light generating unit 111 and the projection optical system 112 may be, for example, a laser scanning color projector that displays each pixel by scanning laser light corresponding to each color of RGB.

[0063] For example, as the image light generating unit 111, a projection device (projector) having a light emitting element using a laser diode (LD), a light emitting diode (LED), or the like, and a light modulation element using a micro electro mechanical system (MEMS), a digital mirror device (DMD), a reflective liquid crystal, a transmissive liquid crystal, or the like may be used as appropriate.

[0064] The cylindrical screen 100 has a cylindrical shape and is disposed around the entire circumference. The cylindrical screen 100 is a transmission type holographic screen.

[0065] The image light emitted from the image light generation unit 111 and the projection optical system 112 is projected by the reflecting mirror 120 toward the inside of the cylindrical screen 100. The image light incident from the inside of the cylindrical screen 100 is diffused (scattered) in various directions by the cylindrical screen 100 and emitted toward the outside. As a result, an image is displayed all around the outside of the cylindrical screen 100.

[0066] Fig. 14 shows a main part of an example of the configuration of a holographic screen according to a comparative example, and Fig. 15 shows a main part of an example of the configuration of a holographic screen according to the first embodiment.

[0067] The cylindrical screen 100 may have the configuration of the hologram screen shown in Fig. 15. The configuration of the hologram screen shown in Fig. 15 may be the same as that of the hologram optical member according to the third configuration example described above (Fig. 12), except for its cylindrical shape. The side on which the first AR layer 61 is provided is the inner side, and the second AR layer 62 is the outer side.

[0068] The hologram screen according to the comparative example shown in Figure 14 has a configuration in which the first hard coat layer 31, the second hard coat layer 32, and the first OCA layer 41 are omitted from the configuration of the hologram screen shown in Figure 15. Compared to a flat hologram screen, a cylindrical hologram screen experiences stresses due to thermal expansion and contraction of the substrate 10 made of a resin material toward the center of the circle. Therefore, a configuration that is less susceptible to cracking than a flat hologram screen is required. By using the hologram screen shown in Figure 15 as the cylindrical screen 100, environmental resistance can be improved, and the reliability of the display quality can be improved.

[0069] Although FIG. 13 shows an example of a configuration in which the cylindrical screen 100 is a transmission type hologram screen, the cylindrical screen 100 may be a reflection type hologram screen.

[0070] [1.3 Effects] As described above, according to the hologram optical element of the first embodiment, the hard coat layer 3 (or first hard coat layer 31) containing an organic material is disposed between the HOE layer 2 (or HOE layer 20) and the substrate 1 (or substrate 10) made of a resin material. This makes it possible to improve environmental resistance. As a result, when applied to a display device, the reliability of the display quality is improved.

[0071] The effects described in this specification are merely examples and are not limiting, and other effects may also be achieved. The same applies to the effects of other embodiments described below.

[0072] 2. Other Embodiments The technology according to the present disclosure is not limited to the above-described embodiments, and various modifications are possible.

[0073] For example, the present technology can be configured as follows: According to the present technology configured as follows, a hard coat layer containing an organic material is disposed between the hologram layer and the substrate, thereby improving environmental resistance.

[0074] (1) A hologram optical member comprising: a hologram layer; a substrate made of a resin material; and a hard coat layer disposed between the hologram layer and the substrate, containing an organic material and having a higher hardness than the substrate. (2) The hologram optical member according to (1) above, wherein the hard coat layer has a pencil hardness of 4H or more and 6H or less. (3) The hologram optical member according to (1) or (2) above, wherein the hard coat layer contains an acrylic resin, a silica liquid solution, and a UV-curable resin. (4) The hologram optical member according to (3) above, wherein the hard coat layer has a refractive index of 1.49 or more and 1.51 or less. (5) The linear expansion coefficient of the hard coat layer is 45 to 90 (×10 －６ / °C). (6) The hologram optical member according to any one of (3) to (5) above, wherein the hard coat layer has a thickness of 2 μm or more and 3 μm or less. (7) The hologram optical member according to (1) or (2) above, wherein the hard coat layer contains a polysiloxane resin and a thermosetting resin. (8) The hologram optical member according to (1) or (2) above, wherein the hard coat layer contains a silicone resin and a thermosetting resin. (9) The hologram optical member according to any one of (1) to (8) above, further comprising an optically transparent pressure-sensitive adhesive layer disposed between the hologram layer and the hard coat layer. (10) The hologram optical member according to any one of (1) to (9) above, wherein the optically transparent pressure-sensitive adhesive layer contains a silicone pressure-sensitive adhesive. (11) The hologram optical member according to any one of (1) to (9) above, wherein the hologram layer, the substrate, and the hard coat layer have curved shapes. (12) A hologram screen comprising: a hologram layer; a substrate made of a resin material; and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer containing an organic material and having a harderness than the substrate. (13) A display device comprising: a hologram screen for displaying an image, the hologram screen comprising: a hologram layer; a substrate made of a resin material; and a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer containing an organic material and having a harderness than the substrate. (14) The display device according to (13) above, wherein the hologram screen has a cylindrical shape.

[0075] This application claims priority based on Japanese Patent Application No. 2021-35855, filed on March 5, 2021, in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0076] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur depending on design requirements and other factors, and are intended to be within the scope of the appended claims and their equivalents.

Claims

1. A holographic layer; A substrate made of a resin material; a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer including an organic material and having a higher hardness than the substrate; Equipped Holographic optical element.

2. The hardness of the hard coat layer is 4H or more and 6H or less in terms of pencil hardness. The hologram optical member according to claim 1 .

3. The hard coat layer is Contains acrylic resin, silica solution, and UV curable resin The hologram optical member according to claim 1 .

4. The refractive index of the hard coat layer is 1.49 or more and 1.51 or less. The hologram optical member according to claim 3 .

5. The linear expansion coefficient of the hard coat layer is 45 to 90 (×10 -6 / °C). The hologram optical member according to claim 3 .

6. The thickness of the hard coat layer is 2 μm or more and 3 μm or less. The hologram optical member according to claim 3 .

7. The hard coat layer is Contains polysiloxane resin and thermosetting resin The hologram optical member according to claim 1 .

8. The hard coat layer is Contains silicone resin and thermosetting resin The hologram optical member according to claim 1 .

9. and an optically transparent adhesive layer disposed between the hologram layer and the hard coat layer. The hologram optical member according to claim 1 .

10. The optically transparent adhesive layer contains a silicone-based adhesive. The holographic optical member according to claim 9 .

11. The hologram layer, the substrate, and the hard coat layer have a curved surface shape. The hologram optical member according to claim 1 .

12. A holographic layer; A substrate made of a resin material; a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer including an organic material and having a higher hardness than the substrate; Equipped Holographic screen.

13. a holographic screen for displaying an image; The holographic screen is A holographic layer; A substrate made of a resin material; a hard coat layer disposed between the hologram layer and the substrate, the hard coat layer including an organic material and having a higher hardness than the substrate; Equipped Display device.

14. The holographic screen has a cylindrical shape. The display device according to claim 13.