Holographic display element, holographic display glass, and vehicle

Abstract

A holographic display element (11), holographic display glass (1), and a vehicle. The holographic display element (11) comprises a holographic display functional layer (111) and substrate layers (112) provided on two opposite sides of the holographic display functional layer (111). The holographic display element (11) satisfies the following condition: F=T*a, wherein F≥240; wherein F represents the flatness of the holographic display element (11), T represents the thickness of the holographic display element (11) in the stacking direction of the holographic display element (11), and a represents the ratio of the transverse tensile strength of the substrate layers (112) to the longitudinal tensile strength of the substrate layers (112).

Description

Holographic display element, holographic display glass and vehicle

[0001] The present disclosure claims priority to the Chinese patent application No. 202410719005.3, filed on June 5, 2024, to the Chinese Patent Office, and entitled "Holographic display element, holographic display glass and vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of holographic display glass, and specifically relates to a holographic display element, a holographic display glass and a vehicle. BACKGROUND

[0003] In the related art, the structure of the holographic display glass is usually glass + adhesive layer + substrate layer + holographic display element + substrate layer + adhesive layer + glass, and is equipped with a corresponding projection device for imaging. However, due to the large difference in thermal shrinkage rate between the adhesive layer and the holographic display element, after the holographic display glass is laminated, the holographic display element is prone to wrinkles, which not only affects the observation of the driver, but also causes image distortion and other problems, reducing the display effect of the holographic display glass. Moreover, some products with serious wrinkles may also affect the driver's field of view, causing safety hazards. SUMMARY

[0004] In view of this, the first aspect of the present application provides a holographic display element, which comprises a holographic display functional layer and substrate layers arranged on opposite sides of the holographic display functional layer.

[0005] The holographic display element satisfies the following conditions: F = T * a, F ≥ 240; wherein F represents the flatness of the holographic display element, T represents the thickness of the holographic display element along the stacking direction of the holographic display element, and a represents the ratio of the transverse tensile strength of the substrate layer to the longitudinal tensile strength of the substrate layer.

[0006] The holographic display element provided in the first aspect of the present application satisfies F=T*a, F≥240. In one aspect, T represents the thickness of the holographic display element. When the thickness of the holographic display element is greater, the holographic display element is less likely to wrinkle. In another aspect, a represents the ratio of the transverse tensile strength of the substrate layer to the longitudinal tensile strength of the substrate layer, that is, a=the transverse tensile strength of the substrate layer PTD / the longitudinal tensile strength of the substrate layer PMD. Wherein, the transverse direction (TD) generally refers to the direction perpendicular to the production direction of the film forming equipment. The longitudinal direction (MD) generally refers to the production direction of the film forming equipment. In the related art, the substrate layer is prone to wrinkle in the transverse direction. The greater a is, that is, the greater the ratio of the transverse tensile strength of the substrate layer to the longitudinal tensile strength of the substrate layer, the greater the transverse tensile strength of the substrate layer, and the greater the tensile strength of the substrate layer in the transverse direction, so that the substrate layer is less likely to wrinkle in the transverse direction, reducing the generation of wrinkles of the holographic display element.

[0007] Moreover, the present application also considers the thickness of the holographic display element, the transverse tensile strength of the substrate layer, and the longitudinal tensile strength of the substrate layer by limiting the product of the thickness of the holographic display element and the ratio of the transverse tensile strength of the substrate layer to the longitudinal tensile strength of the substrate layer F≥240, controls multiple factors of the holographic display element, so that they cooperate with each other, reduce the generation of wrinkles of the holographic display element, improve the display effect of the holographic display glass, and improve the safety performance of the holographic display glass applied in vehicle driving.

[0008] Therefore, the present application limits the thickness of the holographic display element, the transverse tensile strength of the substrate layer, and the longitudinal tensile strength of the substrate layer by limiting the holographic display element to satisfy F=T*a, F≥240, so as to reduce the generation of wrinkles of the holographic display element, improve the display effect of the holographic display glass, and improve the safety performance of the holographic display glass applied in vehicle driving.

[0009] In the holographic display element, F satisfies the following condition: F≥300.

[0010] In the holographic display element, F satisfies the following condition: F≥500.

[0011] In the holographic display element, a satisfies the following condition: a≥0.1.

[0012] In the holographic display element, a satisfies the following condition: a≥0.5.

[0013] In the holographic display element, a satisfies the following condition: a≥1.

[0014] In the holographic display element, a satisfies the following condition: a = PTD / PMD, PTD≥10 MPa, and PMD≥10 MPa; wherein PTD represents the transverse tensile strength of the substrate layer, and PMD represents the longitudinal tensile strength of the substrate layer.

[0015] In the holographic display element, T satisfies the following condition: 10 μm≤T≤1000 μm.

[0016] In the holographic display element, T satisfies the following condition: 30 μm≤T≤800 μm.

[0017] In the holographic display element, T satisfies the following condition: 50 μm≤T≤500 μm.

[0018] The substrate layer comprises a first substrate layer and a second substrate layer respectively arranged on opposite sides of the holographic display functional layer; in the holographic display element, T satisfies the following condition: T = H1+H2+H3, H1:H2:H3=(2-5):(1-3):(2-5);

[0019] In the holographic display element, T satisfies the following condition: 20 μm≤H1, 5 μm≤H2, and 20 μm≤H3.

[0020] The substrate layer comprises a first substrate layer and a second substrate layer respectively arranged on opposite sides of the holographic display functional layer; the holographic display element satisfies the following condition: F comprises F1 and F2, F1=T*a1, F2=T*a2, F1≥240, F2≥240, and a1 is not equal to a2;

[0021] In the holographic display element, T satisfies the following condition: 20 μm≤H1, 5 μm≤H2, and 20 μm≤H3.

[0022] In the holographic display element, T satisfies the following condition: 20 μm≤H1, 5 μm≤H2, and 20 μm≤H3.

[0023] The material of the substrate layer comprises an organic material.

[0024] The material of the substrate layer comprises at least one of PET, PC, TAC, and PMMA.

[0025] In the holographic display element, the thermal shrinkage rate MD1 of the substrate layer satisfies the following condition: 0.9%≤MD1≤2%.

[0026] The second aspect of the present application provides a holographic display glass, which comprises the holographic display element provided in the first aspect of the present application, an adhesive layer arranged on opposite sides of the holographic display element, and glass arranged on opposite sides of the holographic display element and arranged on the side of the adhesive layer away from the holographic display element, the adhesive layer being arranged on the side of the substrate layer away from the holographic display functional layer.

[0027] The holographic display glass provided in the second aspect of the present application reduces the generation of wrinkles of the holographic display element, improves the display effect of the holographic display glass, and improves the safety performance of the holographic display glass applied in vehicle driving, by using the holographic display element provided in the first aspect of the present application, and by limiting the holographic display element to satisfy F=T*a, F≥240, limiting the thickness of the holographic display element, the transverse tensile strength of the substrate layer, and the longitudinal tensile strength of the substrate layer.

[0028] In the holographic display glass, the thermal shrinkage rate MD2 of the adhesive layer satisfies the following condition: MD2≤15%.

[0029] In the holographic display glass, the thermal shrinkage rate MD2 of the adhesive layer satisfies the following condition: MD2≤8%.

[0030] The third aspect of the present application provides a vehicle, which comprises a vehicle body and the holographic display glass provided in the second aspect of the present application, the holographic display glass being arranged on the vehicle body.

[0031] The vehicle provided in the third aspect of the present application reduces the generation of wrinkles of the holographic display element, improves the display effect of the holographic display glass, and improves the safety performance of the holographic display glass applied in vehicle driving, by using the holographic display glass provided in the second aspect of the present application, and by limiting the holographic display element to satisfy F=T*a, F≥240, limiting the thickness of the holographic display element, the transverse tensile strength of the substrate layer, and the longitudinal tensile strength of the substrate layer. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0033] FIG. 1 is a structural schematic diagram of the holographic display glass provided in an embodiment of the present application.

[0034] FIG. 2 is a structural schematic diagram of the holographic display glass provided in another embodiment of the present application.

[0035] The holographic display glass-1, the holographic display element-11, the holographic display functional layer-111, the substrate layer-112, the first substrate layer-112a, the second substrate layer-112b, the adhesive layer-12, the glass-13, the adhesive part-14. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to the embodiments per se, but can be modified in various ways. It should be understood, therefore, that the application is not limited to the embodiments but is susceptible to numerous changes and modifications apparent to one of ordinary skill in the technological field without departing from the principle of the application.

[0037] Unless otherwise defined, or used to contrast from that defined in this specification, the terms or phrases used in this specification are intended to have the meanings commonly used by those of ordinary skill in the art.

[0038] In this specification, "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0039] In this specification, "one or more" means any one, any two or any two or more of the listed items. Among them, "several" means any two or more.

[0040] In this specification, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In this specification, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or it can be detachably connected, or it can be integrated. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this specification can be understood according to the specific circumstances.

[0042] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a holographic display glass according to an embodiment of the present application. The embodiment provides a holographic display element 11, which comprises a holographic display functional layer 111 and a substrate layer 112 arranged on opposite sides of the holographic display functional layer 111. The holographic display element 11 satisfies the following conditions: F = T * a, F ≥ 240; wherein F represents the flatness of the holographic display element 11, T represents the thickness of the holographic display element 11 along the stacking direction of the holographic display element 11, and a represents the ratio of the transverse tensile strength of the substrate layer 112 to the longitudinal tensile strength of the substrate layer 112.

[0043] The embodiment also provides a holographic display glass 1, which comprises the holographic display element 11, a bonding layer 12 arranged on opposite sides of the holographic display element 11, and a glass 13 arranged on opposite sides of the holographic display element 11 and on the side of the bonding layer 12 away from the holographic display element 11, wherein the bonding layer 12 is arranged on the side of the substrate layer 112 away from the holographic display functional layer 111.

[0044] The holographic display element 11 provided by the embodiment comprises the holographic display functional layer 111. The material of the holographic display functional layer 111 can be a transparent RGB photosensitive polymer. The transparent RGB photosensitive polymer can be used to make a holographic optical element (HOE), and through the holographic optical element, the function of being able to arbitrarily control light can be achieved, thereby replacing the function of a traditional HUD freeform mirror.

[0045] The holographic display element 11 provided by the embodiment also comprises the substrate layer 112. The substrate layer 112 can also be understood as a base or a cover layer. In some embodiments, the substrate layer 112 can be used as protection for the holographic display functional layer 111. The substrate layer 112 is made of a transparent material. Optionally, the light transmittance of the substrate layer 112 is ≥ 90%, or the light transmittance of the substrate layer 112 is ≥ 95%. Optionally, the haze of the substrate layer 112 is ≤ 1%, or the haze of the substrate layer 112 is ≤ 0.5%.

[0046] In an embodiment, the material of the substrate layer 112 comprises an organic material. Optionally, the material of the substrate layer 112 comprises at least one of PET, PC, TAC, and PMMA.

[0047] In an embodiment, in the holographic display element 11, the heat shrinkage rate MD1 of the substrate layer 112 satisfies the following condition: 0.9% ≤ MD1 ≤ 2%.

[0048] Optionally, MD1 can be 0.9%, or 1%, or 1.1%, or 1.2%, or 1.3%, or 1.4%, or 1.5%, or 1.6%, or 1.7%, or 1.8%, or 1.9%, or 2%, etc.

[0049] The holographic display glass 1 provided by the embodiment includes a bonding layer 12 for bonding the substrate layer 112 and the glass 13. Optionally, the material of the bonding layer 12 includes at least one of PVB and EVA. Optionally, the thickness of the bonding layer 12 can be 0.76 mm ± 0.02 mm, or 0.38 mm ± 0.02 mm, or 380 μm to 760 μm, or 200 μm to 380 μm, or 100 μm to 200 μm, or 50 μm to 100 μm, etc. Optionally, the bonding strength of the bonding layer 12 is ≥ 10 MPa.

[0050] In one embodiment, in the holographic display glass 1, when the thickness of the bonding layer 12 is 0.38 mm, the thermal shrinkage rate MD2 of the bonding layer 12 satisfies the following condition: MD2 ≤ 15%. In addition, when the thickness of the bonding layer 12 is 0.76 mm, the thermal shrinkage rate MD2 of the bonding layer 12 satisfies the following condition: MD2 ≤ 8%.

[0051] Optionally, MD2 can be 1%, or 2%, or 3%, or 4%, or 5%, or 6%, or 7%, or 8%, or 9%, or 10%, or 11%, or 12%, or 13%, or 14%, or 15%, etc.

[0052] The holographic display glass 1 provided by the embodiment further includes a glass 13. Optionally, the glass 13 can be a single-pane glass, or a double-pane laminated glass, or a hollow glass, etc. Optionally, the glass 13 can be arranged to face outward of the vehicle, or arranged to face inward of the vehicle. Optionally, the thickness of the glass 13 can be in the range of 0.5 mm to 5 mm, which can be 0.5 mm, or 0.8 mm, or 1.6 mm, or 1.8 mm, or 2.0 mm, or 2.1 mm, or ≥ 3 mm, etc.

[0053] The holographic display glass 1 provided by the embodiment includes the glass 13, the bonding layer 12, the substrate layer 112, the holographic display functional layer 111, another substrate layer 112, another bonding layer 12, and another glass 13, which are sequentially stacked. The stacking direction of the holographic display element 11 is shown as the direction D in FIG. 1, which can also be understood as the arrangement direction of the substrate layer 112 pointing to the holographic display functional layer 111, or the stacking direction of the holographic display glass 1, or the arrangement direction of the glass 13 pointing to the holographic display functional layer 111. The thickness of the holographic display element 11 can be understood as the size of the holographic display element 11 along the arrangement direction of the substrate layer 112 pointing to the holographic display functional layer 111.

[0054] Optionally, the holographic display element 11 can be arranged on the entire surface of the glass 13, or arranged on a partial area of the glass 13. When the holographic display element 11 is arranged on a partial area of the glass, the holographic display element 11 can be directly arranged between the two adhesive layers 12, and the two adhesive layers 12 around the holographic display element 11 are tightly adhered by the bonding sheet.

[0055] In addition, in some embodiments, an adhesive portion 14 can be arranged around the holographic display element 11, and the adhesive portion 14 is arranged between the two adhesive layers 12. Optionally, the material of the adhesive portion 14 can be one or more of polycarbonate (PC), polyvinyl chloride (PVC), polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), polyacrylate (PA), polymethyl methacrylate (PMMA), polyurethane (PUR), and ionomer film (SGP). In some further embodiments, the material of the adhesive portion 14 is the same as the material of the adhesive layer 12. In the embodiment in which the adhesive portion 14 is filled around the holographic display element 11, the thickness difference around the holographic display element 11 can be avoided, and the overall appearance quality after bonding can be further improved.

[0056] The holographic display glass 1 provided by the embodiment satisfies F = T * a, and F ≥ 240. Preferably, F satisfies the following condition: F ≥ 300. More preferably, F satisfies the following condition: F ≥ 500.

[0057] Optionally, F can be 240, or 260, or 280, or 300, or 320, or 350, or 380, or 400, or 420, or 450, or 480, or 500, or 520, or 550, or 580, or 600, etc.

[0058] Optionally, a is the ratio of the transverse tensile strength of the substrate layer 112 to the longitudinal tensile strength of the substrate layer 112. Optionally, the two substrate layers 112 have the same a.

[0059] On the one hand, T represents the thickness of the holographic display element 11. The greater the thickness of the holographic display element 11, the less likely the holographic display element 11 is to wrinkle. On the other hand, a represents the ratio of the transverse tensile strength of the substrate layer 112 to the longitudinal tensile strength of the substrate layer 112, i.e., a = transverse tensile strength of the substrate layer 112 P TD / longitudinal tensile strength of the substrate layer 112 P MDTD) is generally perpendicular to the production direction of the film forming device. The machine direction (MD) is generally the production direction of the film forming device. The production direction refers to the direction in which the substrate layer 112 is stretched or extended during the film forming process. If the substrate layer 112 has more than one production direction during the film forming process, any one of the production directions can be taken as the production direction. In the related art, the substrate layer 112 is prone to wrinkles in the transverse direction. The greater the value of a, i.e., the greater the ratio of the transverse tensile strength of the substrate layer 112 to the longitudinal tensile strength of the substrate layer 112, the greater the transverse tensile strength of the substrate layer 112, and the greater the tensile strength of the substrate layer 112 in the transverse direction, so that the substrate layer 112 is less prone to wrinkles in the transverse direction, reducing the occurrence of wrinkles in the holographic display element 11.

[0060] Furthermore, the present embodiment also controls multiple factors of the holographic display element 11 by limiting the product F of the thickness of the holographic display element 11, the ratio of the transverse tensile strength of the substrate layer 112 to the longitudinal tensile strength of the substrate layer 112, and taking into account the thickness of the holographic display element 11, the transverse tensile strength of the substrate layer 112, and the longitudinal tensile strength of the substrate layer 112, so that the multiple factors of the holographic display element 11 cooperate with each other, reducing the occurrence of wrinkles in the holographic display element 11, improving the display effect of the holographic display glass 1, and improving the safety performance of the holographic display glass 1 when applied to vehicle driving.

[0061] Therefore, the present embodiment limits the thickness of the holographic display element 11, the transverse tensile strength of the substrate layer 112, and the longitudinal tensile strength of the substrate layer 112 by limiting the holographic display element 11 to satisfy F = T * a, F ≥ 240, so as to reduce the occurrence of wrinkles in the holographic display element 11, improve the display effect of the holographic display glass 1, and improve the safety performance of the holographic display glass 1 when applied to vehicle driving.

[0062] In one embodiment, in the holographic display glass 1, F satisfies the following condition: F ≥ 500.

[0063] Alternatively, F can be 500, or 520, or 550, or 580, or 600, or 620, or 650, or 680, or 700, or 720, or 750, or 780, or 800, or 850, or 900, or 950, or 1000, etc.

[0064] The embodiment further limits the thickness of the holographic display element 11, the lateral tensile strength of the substrate layer 112, and the longitudinal tensile strength of the substrate layer 112 by further limiting F≥500, thereby further reducing the probability of the generation of wrinkles of the holographic display element 11, further improving the display effect of the holographic display glass 1, and further improving the safety performance of the holographic display glass 1 in vehicle driving.

[0065] In an embodiment, in the holographic display element 11, a satisfies the following condition: a≥0.1.

[0066] Preferably, a satisfies the following condition: a≥0.5. More preferably, a satisfies the following condition: a≥1.

[0067] Alternatively, a can be 0.1, or 0.15, or 0.2, or 0.5, or 0.8, or 1, or 1.5, or 2, or 2.5, or 3, or 3.5, or 4, or 5.5, or 5, or 6, or 7, or 8, or 9, or 10, etc.

[0068] The embodiment limits a≥0.1 to avoid the case that the lateral tensile strength of the substrate layer 112 is much smaller than the longitudinal tensile strength of the substrate layer 112, thereby avoiding the case that a is too small and T is too large, which can not only make a and T cooperate to reduce the generation of wrinkles of the holographic display element 11, improve the display effect of the holographic display glass 1, and improve the safety performance of the holographic display glass 1 in vehicle driving, but also ensure that a light and thin holographic display glass 1 is obtained.

[0069] In an embodiment, in the holographic display element 11, a satisfies the following condition: a=P TD / P MD , P TD ≥10MPa, P MD ≥10MPa; wherein P TD represents the lateral tensile strength of the substrate layer 112, and P MD represents the longitudinal tensile strength of the substrate layer 112.

[0070] Alternatively, P TD may be 10MPa, or 11MPa, or 13MPa, or 15MPa, or 18MPa, or 20MPa, or 25MPa, or 30MPa, or 40MPa, or 50MPa, or 60MPa, or 70MPa, or 80MPa, or 90MPa, or 100MPa, or 120MPa, or 150MPa, or 180MPa, or 200MPa, etc.

[0071] Alternatively, P MDmay be 10 MPa, or 11 MPa, or 13 MPa, or 15 MPa, or 18 MPa, or 20 MPa, or 25 MPa, or 30 MPa, or 40 MPa, or 50 MPa, or 60 MPa, or 70 MPa, or 80 MPa, or 90 MPa, or 100 MPa, or 120 MPa, or 150 MPa, or 180 MPa, or 200 MPa, etc.

[0072] Optionally, the transverse tensile strength of the substrate layer 112 is greater than the longitudinal tensile strength of the substrate layer 112. In other words, a > 1.

[0073] The present embodiment limits the lower limit of the transverse tensile strength of the substrate layer 112 and the longitudinal tensile strength of the substrate layer 112, so that the substrate layer 112 has sufficient tensile strength in the transverse direction and the longitudinal direction, thereby improving the overall tensile strength of the substrate layer 112, reducing the occurrence of wrinkles of the holographic display element 11, improving the display effect of the holographic display glass 1, and improving the safety performance of the holographic display glass 1 when applied to vehicle driving.

[0074] In an embodiment, in the holographic display element 11, T satisfies the following condition: 10 μm ≤ T ≤ 1000 μm.

[0075] Preferably, T satisfies the following condition: 30 μm ≤ T ≤ 800 μm. More preferably, T satisfies the following condition: 50 μm ≤ T ≤ 500 μm.

[0076] Optionally, T can be 10 μm, or 30 μm, or 50 μm, or 100 μm, or 150 μm, or 200 μm, or 250 μm, or 300 μm, or 350 μm, or 400 μm, or 450 μm, or 500 μm, or 600 μm, or 700 μm, or 800 μm, or 900 μm, or 1000 μm, etc.

[0077] The present embodiment limits the range of T to 10 μm-1000 μm, avoids the case that T is too small and a is too large, can cooperate T with a, reduce the occurrence of wrinkles of the holographic display element 11, improve the display effect of the holographic display glass 1, improve the safety performance of the holographic display glass 1 when applied to vehicle driving, and also can ensure to obtain a light and thin holographic display glass 1.

[0078] Please refer to FIG. 2, which is a structural schematic diagram of a holographic display glass provided by another embodiment of the present application. In an embodiment, the substrate layer 112 comprises a first substrate layer 112a and a second substrate layer 112b respectively arranged on opposite sides of the holographic display functional layer 111; in the holographic display element 11, T satisfies the following condition: T = H1+H2+H3, H1:H2:H3 = (2-5):(1-3):(2-5).

[0079] H1 represents the thickness of the first substrate layer 112a in the stacking direction of the holographic display element 11, H2 represents the thickness of the holographic display functional layer 111 in the stacking direction of the holographic display element 11, and H3 represents the thickness of the second substrate layer 112b in the stacking direction of the holographic display element 11.

[0080] Optionally, H1:H2:H3 can be 2:1:2, or 3:1:2, or 2:2:3, or 4:3:3, or 5:3:4, or 5:1:5, etc.

[0081] Optionally, the thickness of the first substrate layer 112a is greater than the thickness of the holographic display element 11, and the thickness of the second substrate layer 112b is greater than the thickness of the holographic display element 11. Optionally, the thickness of the first substrate layer 112a is equal to the thickness of the second substrate layer 112b.

[0082] Optionally, the first substrate layer 112a is closer to the vehicle interior than the second substrate layer 112b, and the thickness of the first substrate layer 112a is less than the thickness of the second substrate layer 112b. By making the thickness of the first substrate layer 112a closer to the vehicle interior smaller, the distance between the holographic display element 11 and the vehicle interior projector can be reduced, thereby reducing ghosting and improving the display effect of the holographic display glass 1.

[0083] In an embodiment, in the holographic display element 11, T satisfies the following conditions: 20 pm≤H1, 5 pm≤H2, and 20 pm≤H3.

[0084] Optionally, the thickness H1 of the first substrate layer 112a can be 20 pm, or 30 pm, or 50 pm, or 80 pm, or 100 pm, or 150 pm, or 200 pm, or 300 pm, or 400 pm, etc.

[0085] Optionally, the thickness H2 of the holographic display functional layer 111 can be 20 pm, or 30 pm, or 50 pm, or 80 pm, or 100 pm, or 120 pm, or 150 pm, or 180 pm, or 200 pm, or 250 pm, or 300 pm, etc.

[0086] Optionally, the thickness H3 of the second substrate layer 112b can be 20 pm, or 30 pm, or 50 pm, or 80 pm, or 100 pm, or 150 pm, or 200 pm, or 300 pm, or 400 pm, etc.

[0087] The embodiment limits the lower limit of the thickness of the first substrate layer 112a, the thickness of the holographic display functional layer 111, and the thickness of the second substrate layer 112b, so that the first substrate layer 112a, the holographic display functional layer 111, and the second substrate layer 112b have sufficient thickness, thereby improving the tensile strength of the substrate layer 112 as a whole, further reducing the generation of wrinkles of the holographic display element 11, improving the display effect of the holographic display glass 1, and improving the safety performance of the holographic display glass 1 in vehicle driving.

[0088] In an embodiment, the substrate layer 112 includes a first substrate layer 112a and a second substrate layer 112b respectively arranged on opposite sides of the holographic display functional layer 111; and the holographic display glass 1 satisfies the following conditions: F includes F1 and F2, F1 = T * a1, F2 = T * a2, F1 ≥ 240, F2 ≥ 240, and a1 is not equal to a2.

[0089] Wherein, F1 and F2 both represent the flatness of the substrate layer 112, a1 represents the ratio of the transverse tensile strength of the first substrate layer 112a to the longitudinal tensile strength of the first substrate layer 112a, and a2 represents the ratio of the transverse tensile strength of the second substrate layer 112b to the longitudinal tensile strength of the second substrate layer 112b.

[0090] The flatness F of the holographic display element 11 includes F1 obtained by a1 and F2 obtained by a2. The embodiment further reduces the generation of wrinkles of the holographic display element 11, further improves the display effect of the holographic display glass 1, and further improves the safety performance of the holographic display glass 1 in vehicle driving, by limiting the holographic display element 11 to satisfy F1 ≥ 240 and F2 ≥ 240, i.e., by limiting the ratio of the transverse tensile strength of the first substrate layer 112a to the longitudinal tensile strength of the substrate layer 112 and the ratio of the transverse tensile strength of the second substrate layer 112b to the longitudinal tensile strength of the substrate layer 112.

[0091] The application also provides a vehicle including a vehicle body and a holographic display glass provided as described above.

[0092] The vehicle provided by the embodiment reduces the generation of wrinkles of the holographic display element, improves the display effect of the holographic display glass, and improves the safety performance of the holographic display glass in vehicle driving, by adopting the holographic display glass provided as described above, and limiting the holographic display element to satisfy F = T * a, F ≥ 240, and limiting the thickness of the holographic display element, the transverse tensile strength of the substrate layer, and the longitudinal tensile strength of the substrate layer.

[0093] In order to make the purposes and advantages of the present application more clear, the effects of the holographic display glass of the present application are further described in detail below in combination with specific embodiments.

[0094] It should be noted that in Comparative Example 1-2 and Example 1-8, the two substrate layers of each holographic display element are selected as PET, the film material, and the a of the two substrate layers of each holographic display element is equal, and the bonding layer of the holographic display glass is PVB material. Specifically, the specific parameters of the holographic display glass provided in Comparative Example 1-2 and Example 1-8 are shown in Table 1 and Table 2 as follows:

[0095] Table 1 Specific parameters of the holographic display glass in Comparative Example 1-2

[0096] As can be seen from Table 1, the flatness F of Comparative Example 1-2 is 100-200, resulting in a multi-crinkled state visible to the naked eye at the position of the holographic display element after lamination of the holographic display glass.

[0097] Table 2 Specific parameters of the holographic display glass in Example 1-8

[0098] As can be seen from Table 2, the flatness F of Example 1-2 is 240-300, and although there are a small amount of wrinkles at the position of the holographic display element after lamination of the holographic display glass, the small amount of wrinkles is basically invisible to the naked eye when observed at the driving position. The flatness F of Example 3-8 is ≥300, and the holographic display glass at the position of the holographic display element is in a wrinkle-free state.

[0099] Therefore, by limiting the flatness F of the holographic display element to be ≥240, the generation of wrinkles after lamination of the glass can be reduced, and a holographic display glass with few or even no wrinkles is provided, so that the driver can observe the driving state and road conditions of the vehicle without having to lower his head during driving, thereby ensuring the safety of the driver and improving the satisfaction of the driver. In daily use, the design can maintain the functions of ordinary vehicle glass, achieving lighting and viewing.

[0100] The above provides a detailed description of the content provided by the embodiments of the present application, and the principles and embodiments of the present application are described and explained in this paper. The above description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range will be changed; in view of the above, the content of the description should not be understood as a limitation of the present application.

Claims

1. A holographic display element, characterized by The holographic display element comprises a holographic display functional layer and substrate layers arranged on opposite sides of the holographic display functional layer. The holographic display element satisfies the following conditions: F=T*a, F>=240; wherein F represents flatness of the holographic display element, T represents thickness of the holographic display element along the stacking direction of the holographic display element, and a represents the ratio of the transverse tensile strength of the substrate layer to the longitudinal tensile strength of the substrate layer.

2. A holographic display element according to claim 1, wherein, In the holographic display element, F satisfies the following condition: F>=300.

3. A holographic display element according to claim 2, wherein In the holographic display element, F satisfies the following condition: F>=500.

4. A holographic display element as claimed in claim 1, characterized in that In the holographic display element, a satisfies the following condition: a>=0.

1.

5. A holographic display element as claimed in claim 4, characterised in that, In the holographic display element, a satisfies the following condition: a>=0.

5.

6. A holographic display element according to claim 5, wherein In the holographic display element, a satisfies the following condition: a>=1.

7. A holographic display element as claimed in claim 1 or 4, characterized in that In the holographic display element, a satisfies the following condition: a=PTD / PMD, PTD>=10MPa, PMD>=10MPa; wherein PTD represents the transverse tensile strength of the substrate layer, and PMD represents the longitudinal tensile strength of the substrate layer.

8. A holographic display element according to claim 1, wherein, In the holographic display element, T satisfies the following condition: 10um<=T<=1000um.

9. A holographic display element according to claim 8, wherein, In the holographic display element, T satisfies the following condition: 30um<=T<=800um.

10. A holographic display element according to claim 9, wherein, In the holographic display element, T satisfies the following condition: 50um<=T<=500um.

11. A holographic display element as claimed in claim 1 or 8, characterised in that, The substrate layer comprises a first substrate layer and a second substrate layer arranged on opposite sides of the holographic display functional layer; in the holographic display element, T satisfies the following condition: T=H1+H2+H3, H1:H2:H3=(2-5):(1-3):(2-5); wherein H1 represents thickness of the first substrate layer along the stacking direction of the holographic display element, H2 represents thickness of the holographic display functional layer along the stacking direction of the holographic display element, and H3 represents thickness of the second substrate layer along the stacking direction of the holographic display element.

12. A holographic display element according to claim 11, wherein In the holographic display element, T satisfies the following condition: 20um<=H1, 5um<=H2, 20um<=H3.

13. A holographic display element as claimed in claim 1, characterized in that The substrate layer comprises a first substrate layer and a second substrate layer arranged on opposite sides of the holographic display functional layer; the holographic display element satisfies the following conditions: F comprises F1 and F2, F1=T*a1, F2=T*a2, F1>=240, F2>=240, and a1 is not equal to a2; wherein F1 and F2 both represent flatness of the holographic display element, a1 represents the ratio of the transverse tensile strength of the first substrate layer to the longitudinal tensile strength of the first substrate layer, and a2 represents the ratio of the transverse tensile strength of the second substrate layer to the longitudinal tensile strength of the second substrate layer.

14. A holographic display element as claimed in claim 1, characterised in that, The material of the substrate layer comprises an organic material.

15. A holographic display element according to claim 14, wherein The material of the substrate layer comprises at least one of PET, PC, TAC, and PMMA.

16. A holographic display element as claimed in claim 1, characterised in that, In the holographic display element, the heat shrinkage rate MD1 of the substrate layer satisfies the following condition: 0.9%<=MD1<=2%.

17. A holographic display glass characterized by, The holographic display glass comprises the holographic display element according to any one of claims 1-16, the adhesive layers arranged on opposite sides of the holographic display element, and the glass arranged on opposite sides of the holographic display element and arranged on the side of the adhesive layers away from the holographic display element, the adhesive layers being arranged on the side of the substrate layer away from the holographic display functional layer.

18. The holographic display glass of claim 17, wherein, In the holographic display glass, the thermal shrinkage rate MD2 of the adhesive layer satisfies the following condition: MD2≤15%.

19. The holographic display glass of claim 18, wherein, In the holographic display glass, the thermal shrinkage rate MD2 of the adhesive layer satisfies the following condition: MD2≤8%.

20. A vehicle characterized by The vehicle comprises a vehicle body and the holographic display glass according to any one of claims 17-19, the holographic display glass being arranged on the vehicle body.

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