Transfer printing film, optical element, head-up display system and transfer printing method

Abstract

The invention relates to a transfer printing film, an optical element, a head-up display system and a transfer printing method, the transfer printing film is used for transfer printing of the optical element, the transfer printing film comprises a bearing base layer and a shading layer, the bearing base layer comprises a plurality of first areas and a plurality of second areas, the first areas are arranged at intervals in the first direction, and the second areas are arranged at intervals in the second direction. The second areas are arranged between two adjacent first areas, the elasticity modulus of the second areas is smaller than that of the first areas, the shading layer is arranged on the bearing base layer and comprises a plurality of sub-ink areas arranged in the first areas in a one-to-one correspondence mode, and the first direction is parallel to the side face, facing the shading layer, of the bearing base layer. The transfer printing film has a better transfer printing effect, and the optical element transferred by using the transfer printing film has more uniform ink distribution and has a better blocking effect on backward sunlight.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and in particular to a transfer film, an optical element, a head-up display system and a transfer method. Background Art

[0002] The Head-Up Display (HUD) system has the problem of sunlight backflow damaging internal components. Sunlight backflow means that when sunlight passes through the HUD system, due to the focusing effect of the optical system, it may generate excessively high temperatures on key components of the HUD, such as the picture display unit (PGU), and may even burn these components.

[0003] HUD in related technology usually adopts optical elements on the light-emitting side of the picture generation unit (PGU) to control and optimize the image light path. At the same time, the design of the optical element blocks the sunlight incident on the head-up display system, thereby reducing the damage to the head-up display system caused by sunlight backflow.

[0004] However, in the related art, the setting of optical elements to reduce the impact of sunlight backflow has a need to improve the blocking effect of incident sunlight. Summary of the invention

[0005] Based on this, a transfer film, an optical element, a head-up display system and a transfer method are provided to transfer ink to a transfer area on an optical substrate through the transfer film. The optical element formed after the transfer has a better blocking effect on sunlight incident into the head-up display system.

[0006] According to one aspect of the present application, a transfer film is provided, the transfer film comprising:

[0007] A carrier base layer, comprising a plurality of first regions and a plurality of second regions, wherein the plurality of first regions are arranged at intervals along a first direction, the second region is arranged between two adjacent first regions, and an elastic modulus of the second region is smaller than an elastic modulus of the first region; and

[0008] A light shielding layer is disposed on the carrier substrate, the light shielding layer comprises a plurality of sub-ink areas which are disposed in a one-to-one correspondence in the first area, and the transfer film is used to transfer the light shielding layer to an optical substrate to form an optical element;

[0009] Wherein, the first direction is parallel to the side of the supporting base layer toward the light shielding layer.

[0010] In one embodiment, the second region is provided with a plurality of via holes, the plurality of via holes are arranged at intervals along the second direction, and the via holes are arranged through the second region along the thickness direction of the carrier substrate;

[0011] The second direction is parallel to the side of the supporting substrate facing the light shielding layer, and the first direction and the second direction intersect with each other.

[0012] In one embodiment, the adhesion between the light-shielding layer and the optical base is greater than the adhesion between the light-shielding layer and the supporting base layer.

[0013] In one embodiment, the material of the supporting base layer includes polyethylene terephthalate, polycarbonate, acrylonitrile butadiene styrene, polyethylene naphthalate, polyolefin or polyethylene.

[0014] According to another aspect of the present application, an optical element is provided, comprising:

[0015] The body; and

[0016] a plurality of pyramidal portions protruding from the body, the plurality of pyramidal portions being sequentially arranged along the first direction, the light-emitting surface of each pyramidal portion comprising a transfer area and a light-transmitting area sequentially arranged along the first direction, and a connecting area connected between the transfer area and the light-transmitting area, and a preset angle being formed between a plane where the transfer area is located and a plane where the light-transmitting area is located; and

[0017] A shading layer is arranged on the pyramidal portion, and the shading layer is formed by transferring the transfer film sheet described in any one of claims 1 to 4 onto the pyramidal portion, the sub-ink area of ​​the first area is at least partially arranged in the transfer area and the connecting area, and the second area is opposite to the light-transmitting area.

[0018] In one embodiment, the connection area and the light-transmitting area are located in the same plane, and the connection area and the transfer area form the preset angle.

[0019] In one embodiment, the size of the transfer area along the direction from the adjacent light-transmitting area to the adjacent connecting area is a, the size of the connecting area along the direction from the adjacent transfer area to the adjacent light-transmitting area is b, the size of the light-transmitting area along the direction from the adjacent connecting area to the adjacent transfer area is c, the distance between the connecting area and the body close to the transfer area is H, the size of the first area along the first direction is L1, and the size of the second area along the first direction is L2, then the sum of the sizes of the first area and the second area along the first direction L1+L2 satisfies:

[0020] .

[0021] In one embodiment, the size of the second area along the first direction is L2, the size of the light-transmitting area along the direction from the adjacent connecting area to the adjacent transfer area is c, and the stretching rate X of the second area satisfies: X≥c / L2.

[0022] According to another aspect of the present application, a head-up display system is provided, the head-up display system includes the optical element in any of the above embodiments, the head-up display system also includes an image generating unit, the optical element is arranged on the light emitting side of the image generating unit, and the output light of the image generating unit is emitted from the light transmitting area of ​​the optical element.

[0023] According to another aspect of the present application, a transfer method is provided, the transfer method comprising:

[0024] An optical substrate and a transfer film in any of the above embodiments are provided, wherein the optical substrate comprises a body and a plurality of pyramidal portions protruding from the body, wherein the plurality of pyramidal portions are sequentially arranged along the first direction, wherein a light-emitting surface of each pyramidal portion comprises a transfer area and a light-transmitting area sequentially arranged along the first direction, and a connecting area connected between the transfer area and the light-transmitting area, wherein a plane where the transfer area is located and a plane where the light-transmitting area is located form a preset angle;

[0025] The optical substrate and the transfer film are placed opposite to each other, and the sub-ink area of ​​the first region of the transfer film is aligned with the transfer area corresponding to the optical substrate;

[0026] Applying pressure to the transfer film by using a grinding tool so that the sub-ink area of ​​the first area is attached to the corresponding transfer area and the connecting area, and the second area is stretched to be opposite to the corresponding light-transmitting area;

[0027] The carrier substrate is separated from the sub-ink area by heating dissociation or light dissociation to obtain the optical element.

[0028] The above transfer film can transfer the sub-ink area to the transfer area on the optical substrate, so that the outgoing light of the image generation unit can be emitted from the light-transmitting area of ​​the optical substrate, and the sub-ink area is provided on the transfer area of ​​the optical substrate, so that the backflow of sunlight can be blocked, and the energy of the sunlight backflowing to the image generation unit can be reduced. At the same time, the transfer film of the present application is clearly divided into zones, the first zone is used to carry the sub-ink area, and the second zone is used to correspond to the light-transmitting area to avoid the ink from being stained on the light-transmitting area and affecting the light output of the optical substrate. And the elastic modulus of the second area of ​​the present application is smaller than the elastic modulus of the first area, so that for the transfer of the light-emitting surface of the optical substrate of different shapes, the second area has a certain stretching range, one is that the second area can adapt to the corresponding stretching of the light-emitting surface of different shapes, and then facilitate the precise alignment of the sub-ink area and the transfer area of ​​the optical substrate, and has a better transfer effect, so that the optical element formed after the transfer has a better effect of blocking the backflow of sunlight. Secondly, the elastic modulus of the second area is relatively small, so that when the transfer film is deformed, the second area can be stretched first, avoiding the first area carrying the sub-ink area from being stretched and deformed, resulting in uneven splitting of the sub-ink area it carries, affecting the transfer effect of the ink on the optical substrate, and avoiding uneven distribution of ink in the transfer area on the optical substrate, affecting its blocking effect against backflow of sunlight. That is, the transfer film of the present application has a better transfer effect, and the optical element obtained by transfer using the transfer film of the present application has a more uniform ink distribution and has a better blocking effect against backflow of sunlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 is a schematic diagram of a transfer film attached to an optical substrate according to an embodiment of the present application.

[0030] FIG. 2 is a schematic diagram of a side view of a transfer film relative to an optical substrate according to an embodiment of the present application.

[0031] FIG. 3 is a front view schematic diagram of the transfer film of the embodiment shown in FIG. 2 .

[0032] FIG. 4 is a schematic front view of the structure of the transfer film sheet of the embodiment shown in FIG. 2 after being stretched.

[0033] Description of reference numerals:

[0034] 10. Transfer film;

[0035] 100, carrier base layer; 110, first area; 120, second area; 121, via hole; 200, light shielding layer; 210, sub-ink area;

[0036] 20. Optical substrate; 30. Optical element;

[0037] 300, pyramidal portion; 310, transfer area; 320, light-transmitting area; 330, connection area;

[0038] F1, first direction; F2, second direction. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0045] Head-Up Display (HUD) is a transparent display technology that projects key driving information in front of the driver's line of sight. It projects image information onto a semi-transparent mirror through a projector, and then the mirror reflects the image into the driver's line of sight, allowing the driver to quickly obtain the required information while keeping his line of sight unchanged.

[0046] However, the head-up display system has the problem of sunlight backflow damaging internal components. And the setting of reducing the impact of sunlight backflow in the related technology needs to be improved in blocking the incident sunlight.

[0047] Based on this, the present application provides a transfer film, an optical element, a head-up display system and a transfer method, so as to transfer the ink to the transfer area on the optical substrate through the transfer film to form an optical element. The optical element formed after the transfer has a better blocking effect on the sunlight incident on the head-up display system.

[0048] Referring to Figures 1, 2 and 3, Figure 1 is a schematic diagram of a transfer film 10 attached to an optical substrate 20 in one embodiment of the present application. Figure 2 is a schematic diagram of a side view of a transfer film 10 relative to an optical substrate 20 in one embodiment of the present application. Figure 3 is a schematic diagram of a front view of the transfer film 10 in the embodiment shown in Figure 2.

[0049] The present application provides a transfer film 10, which is used to transfer the optical substrate 20 so that a preset area on the optical substrate 20 can be printed with graphite to block the backflow of sunlight, wherein the preset area can be determined by the specific design of the optical substrate 20 and the area that needs to be shielded.

[0050] The transfer film 10 includes a carrier substrate 100 and a light shielding layer 200 disposed on the carrier substrate 100. The carrier substrate 100 includes a plurality of first regions 110 and a plurality of second regions 120, wherein the first region 110 is used to carry a plurality of sub-ink regions 210 of the light shielding layer 200, and the second region 120 is used to be spaced between two adjacent first regions 110. In other words, the plurality of first regions 110 are spaced along the first direction F1, the second region 120 is disposed between two adjacent first regions 110, the light shielding layer 200 includes a plurality of sub-ink regions 210 disposed one by one in the first region 110, and the transfer film 10 is used to transfer the light shielding layer 200 onto the optical substrate 20 to form the optical element 30, and the first direction F1 is parallel to the side of the carrier substrate facing the light shielding layer 200. The first region 110 and the second region 120 are clearly divided, which can reduce the risk of ink contaminating the light-transmitting region 320 of the optical substrate 20 and affecting the light emission of the optical substrate 20.

[0051] And the elastic modulus of the second area 120 is smaller than that of the first area 110. The larger the elastic modulus, the smaller the deformation of the material under the same force, that is, the greater the rigidity of the material. In other words, the structural elastic modulus of the second area 120 is smaller than that of the first area 110, or the rigidity of the second area 120 is smaller than that of the first area 110. For the transfer of the light-emitting surface of the optical substrate 20 of different shapes, such as the optical substrate 20 with a raised pyramid portion 300 as shown in Figures 1 and 2, when the transfer film 10 and the optical substrate 20 are in a relative state as shown in Figure 2, the transfer film 10 is relatively flat, and the first area 110 to which the sub-ink area 210 needs to be attached corresponds to the transfer area 310 of the optical substrate 20, that is, the area to be transferred of the optical substrate 20, and the second area 120 to which the ink is not attached corresponds to the area to be transferred of the optical substrate 20, that is, the light-transmitting area 320, which is convenient for subsequent attachment and transfer.

[0052] When the light shielding layer 200 of the transfer film 10 is attached to the optical substrate 20, as shown in FIG1 , when the transfer film 10 and the optical substrate 20 are in an attached state, the first area 110 of the transfer film 10 and the transfer area 310 of the optical substrate 20 need to correspond to each other, and the second area 120 and the light-transmitting area 320 of the optical substrate 20 need to be attached to each other. Since the pyramidal portion 300 of the optical substrate 20 is convex and not flat, it is obviously necessary for the transfer film 10 to change from flat to uneven during the transition from the relative state to the attached state. The transfer film 10 will undergo tensile deformation during this state transition to adapt to the increase in size when it becomes uneven.

[0053] It can be understood that a sub-ink area 210 is provided in the first area 110. If the first area 110 is deformed, the sub-ink area 210 thereon will be deformed accordingly, and the deformed sub-ink area 210 will be uneven in various places. In this way, after being transferred to the optical substrate 20, the sub-ink area 210 on the optical substrate 20 will be uneven in various places, affecting the shading effect of the corresponding parts.

[0054] Correspondingly, the elastic modulus of the second area 120 is smaller, and the elastic modulus of the first area 110 is larger, so that when the transfer film 10 is stretched, the second area 120 is stretched first, which is beneficial to the first area 110 not being deformed as much as possible, which is beneficial to improving the uniformity and transfer effect of the sub-ink area 210, improving the uniformity of the sub-ink area 210 on the optical substrate 20, and improving the ability of the optical substrate 20 to resist sunlight backflow.

[0055] In some embodiments, the structural strength of the second region 120 may be weakened, or the storage modulus of the first region 110 may be increased, so that the storage modulus of the first region 110 is more than ten times greater than that of the second region 120, so that the second region 120 is more easily stretched and deformed, so as to effectively control the stretching deformation area within the second region 120, thereby facilitating the improvement of the uniformity and transfer effect of the sub-ink area 210. The storage modulus of the first region 110 may be increased by selecting the material of the material applied to the first region 110, for example, by using ink with a higher storage modulus or adding inorganic materials to the ink to increase the storage modulus of the first region 110.

[0056] In some embodiments, as shown in FIG3, in combination with FIG4, FIG4 is a schematic diagram of the front view structure of the transfer film 10 after stretching in the embodiment shown in FIG2. The structure of weakening the second region 120 can be realized by designing the structure of the second region 120, such as providing a plurality of vias 121 in the second region 120, the plurality of vias 121 are arranged at intervals along the second direction F2, and the vias 121 are penetrated in the second region 120 along the thickness direction of the supporting base layer 100, wherein the second direction F2 is parallel to the side of the supporting base layer facing the light shielding layer 200, and the first direction F1 and the second direction F2 intersect each other. It can be understood that by arranging a plurality of the above-mentioned vias 121 on the second area 120, the structural strength of the second area 120 can be made smaller than the structural strength of the first area 110. When the transfer film 10 is stretched and deformed, the second area 120 is stretched preferentially, which is beneficial to improving the uniformity of the sub-ink area 210 of the first area 110, thereby improving the transfer effect, improving the uniformity of the sub-ink area 210 on the optical substrate 20, and improving the anti-sunlight backflow capability of the optical element 30 formed by transfer.

[0057] In some embodiments, as shown in FIG. 3 and in combination with FIG. 4 , the plurality of vias 121 are evenly spaced along the second direction F2, thereby facilitating uniform structural strength of the second region 120 , so that when stretched, the second region 120 can be stretched evenly, thereby making the distance between two adjacent first regions 110 evenly change, thereby facilitating improving the alignment accuracy between the first region 110 and the transfer area 310 of the optical substrate 20 .

[0058] In some embodiments, the material of the carrier substrate 100 includes polyethylene terephthalate, polycarbonate, acrylonitrile butadiene styrene, polyethylene naphthalate, polyolefin or polyethylene.

[0059] It can be understood that polyethylene terephthalate (PET) is a thermoplastic polyester with excellent thermal properties, mechanical properties, chemical stability, electrical insulation and wear resistance. Polycarbonate (PC) is a colorless, transparent, amorphous thermoplastic material with outstanding impact resistance, good creep resistance and dimensional stability, heat resistance, low water absorption, non-toxicity, and excellent dielectric properties. Acrylonitrile-butadiene-styrene (ABS) is a thermoplastic polymer composed of three monomers: acrylonitrile, butadiene and styrene. It has good impact resistance, heat resistance and processing properties. Polyethylene naphthalate (PEN) is a high-performance engineering plastic with excellent heat resistance, chemical resistance and mechanical properties. Polyolefin (PO) is a class of polymer materials formed by the polymerization of monomers such as ethylene and propylene, including polyethylene (PE), polypropylene (PP), etc., which usually have good chemical stability and mechanical properties. Polyethylene (PE) is a common plastic material with good chemical stability and electrical insulation, as well as low water vapor permeability.

[0060] In some embodiments, the adhesion between the light shielding layer 200 and the optical substrate 20 is greater than the adhesion between the light shielding layer 200 and the supporting substrate 100. After the light shielding layer 200 is adhered to the optical substrate 20, the supporting substrate 100 can be more easily separated from the light shielding layer 200, thereby improving the convenience of operation.

[0061] 1 and 2 , the present application further provides an optical element 30 and a head-up display system. The optical element 30 is formed by transferring the transfer film 10 in any of the above-mentioned embodiments, and the optical element 30 includes a main body, a plurality of pyramidal portions 300 protruding from the main body, and a shading layer in any of the above-mentioned embodiments provided on the pyramidal portions.

[0062] The head-up display system includes the above-mentioned optical element 30, and also includes structures such as an image generating unit, a first reflecting element, and a second reflecting element. The optical element 30 of the present application is arranged on the light-emitting side of the image generating unit, and the optical element 30 can also be replaced by a light-emitting window of the image generating unit. The light emitted by the image generating unit passes through the optical element 30, the first reflecting element, and the second reflecting element and is emitted to an imaging surface for display imaging for viewing by the user. Among them, the imaging surface can coincide with the windshield of a vehicle equipped with the head-up display system of the present application, such as coincidence with the windshield of a vehicle, an aircraft, or the like equipped with the head-up display system of the present application.

[0063] The optical element 30 of the present application is designed with a pyramid portion 300 so that the light emitted by the image generation unit of the head-up display system can be optically modulated after passing through the optical element 30, thereby optimizing the optical path of the head-up display system and improving the display quality of the head-up display system.

[0064] The plurality of pyramidal portions 300 are sequentially arranged along the first direction F1, and the light-emitting surface of each pyramidal portion 300 includes a transfer area 310 and a light-transmitting area 320 sequentially arranged along the first direction F1, and a connection area 330 connected between the transfer area 310 and the light-transmitting area 320. The light-transmitting area 320 is used to transmit the light emitted by the image generating unit, so that the light emitted by the image generating unit can penetrate the optical element 30 and propagate to the first reflecting element and the second reflecting element and the imaging surface for imaging. The transfer area 310 is used to transfer the light-shielding layer 200 to block the backflowing sunlight, thereby reducing the risk of the backflowing sunlight entering the head-up display system and burning the image generating unit.

[0065] There is a preset angle between the plane where the transfer area 310 is located and the plane where the light-transmitting area 320 is located, so as to form a raised pyramidal portion 300 together with the connecting area 330. The light-shielding layer 200 is formed by transferring the transfer film 10 in any of the above embodiments onto the pyramidal portion 300, and the sub-ink area 210 of the first area 110 is at least partially arranged in the transfer area 310 and the connecting area 330, and the second area 120 is opposite to the light-transmitting area 320. It can be understood that the sub-ink area 210 is arranged in the transfer area 310 to block the transfer area 310, so that the transfer area 310 is not light-transmitting, so that the optical element 30 can play the effect of blocking sunlight backflow, and the sub-ink area 210 is arranged in the connecting area 330 mainly to ensure that the transfer area 310 is well covered, and reduce the probability that the partial area of ​​the transfer area 310 is not covered, resulting in poor effect of blocking sunlight backflow.

[0066] It can be understood that when the second area 120 of the transfer film 10 is deformed, the part of the second area 120 close to the first area 110 will cause the part of the first area 110 close to the second area 120 to slightly deform, causing the light shielding layer 200 in the area of ​​the first area 110 close to the second area 120 or slightly deformed to also deform, resulting in uneven transfer of the corresponding part to the optical substrate 20, affecting the blocking of the backflowing sunlight by the optical element 30 formed by the transfer. The design of the present application allows the sub-ink area 210 of the first area 110 to be partially transferred to the connection area 330, that is, there is a corresponding relationship, and it can be known that the connection area 330 is set between the transfer area 310 and the light-transmitting area 320, so that the connection area 330 corresponds to the light shielding layer 200 in the area of ​​the first area 110 close to the second area 120 or slightly deformed. The light-shielding layer 200 that is slightly deformed in this part can be transferred to the connecting area 330 instead of being transferred to the transfer area 310, so that the ink transferred to the transfer area 310 has better uniformity and is not affected by the deformation of the transfer film 10, which is beneficial to improve the effect of the light-shielding layer 200 in the transfer area 310 in blocking the backflow of sunlight, and improve the effect of the optical element 30 in blocking the backflow of sunlight.

[0067] In some embodiments, referring to FIG. 1 , the connection area 330 and the light-transmitting area 320 are located in the same plane, and a preset angle is formed between the connection area 330 and the transfer area 310. That is, the connection area 330 and the transfer area 310 are connected, and the angle between the two constitutes the vertex angle of the pyramid portion 300, so that the vertex angle of the pyramid portion 300 is better covered by ink, which is further beneficial to improve the uniformity and completeness of ink coverage on the transfer area 310, and to improve the blocking effect of sunlight after the transfer area 310 is covered with ink.

[0068] In some embodiments, referring to FIG. 2 , the dimension of the transfer area 310 along the direction from the adjacent light-transmitting area 320 to the adjacent connecting area 330 is a, the dimension of the connecting area 330 along the direction from the adjacent transfer area 310 to the adjacent light-transmitting area 320 is b, and the dimension of the light-transmitting area 320 along the direction from the adjacent connecting area 330 to the adjacent transfer area 310 is c. The distance between the connecting area 330 and the body close to the transfer area 310 is H, the dimension of the first area 110 along the first direction F1 is L1, and the dimension of the second area 120 along the first direction F1 is L2, then the sum of the dimensions of the first area 110 and the second area 120 along the first direction F1 L1+L2 satisfies:

[0069] …………Formula 1.

[0070] The sum L1+L2 of the dimensions of the first area 110 and the second area 120 along the first direction F1 satisfies formula 1. When the transfer film 10 and the optical substrate 20 are in a relative state as shown in FIG. 2 , the multiple sub-ink areas 210 can correspond one-to-one to the multiple transfer areas 310 of the optical substrate 20.

[0071] The transfer film 10 also needs to be in the attached state of the transfer film 10 and the optical substrate 20 as shown in FIG. 1 , so it can be understood that the size L1 of the first area 110 along the first direction F1 also satisfies:

[0072] L1=a+b;

[0073] Obviously, after the second area 120 of the transfer film 10 is stretched and deformed, the dimension L21 of the second area 120 after stretching and deformation along the direction from the adjacent light-transmitting area 320 to the adjacent transfer area 310 satisfies:

[0074] L21=c.

[0075] In this way, when the transfer film 10 and the optical substrate 20 are in a relative state, the multiple sub-ink areas 210 can correspond one-to-one with the multiple transfer areas 310 of the optical substrate 20. When the transfer film 10 and the optical substrate 20 are in an attached state, the multiple sub-ink areas 210 can still correspond one-to-one with the multiple transfer areas 310 of the optical substrate 20. By setting the elastic modulus of the second area 120 to be smaller than the elastic modulus of the first area 110, it is beneficial to accurately align the transfer film 10 and the optical substrate 20 and transfer, and it is beneficial to preferentially stretch the second area 120 when the transfer film 10 is deformed, so as to avoid the first area 110 carrying the sub-ink area 210 from being stretched and deformed to affect the transfer effect.

[0076] In some embodiments, the stretch rate X of the second region 120 satisfies: X≥c / L2. Alternatively, it can be understood that the stretch rate X of the second region 120 satisfies: X≥L21 / L2, so that the second region 120 can withstand the stretching deformation from the size L2 to the size L21 without damaging the structure of the second region 120 and causing it to rupture.

[0077] The present application also provides a transfer method, which is used to transfer the optical substrate 20 in any of the above embodiments by using the transfer film 10 in any of the above embodiments, so as to transfer and form the optical element 30 in any of the above embodiments. The transfer method includes:

[0078] First, provide an optical substrate 20 and a transfer film 10. The transfer film 10 is the transfer film 10 in any of the above embodiments, and the optical substrate 20 is the optical substrate 20 in any of the above embodiments, which will not be described in detail.

[0079] Afterwards, the optical substrate 20 and the transfer film 10 are placed opposite to each other, and the sub-ink area 210 of the first area 110 of the transfer film 10 is aligned with the transfer area 310 corresponding to the optical substrate 20, or in other words, the optical substrate 20 and the transfer film 10 are placed in a relative state, and the first area 110 of the transfer film 10 is aligned with the transfer area 310 of the optical substrate 20.

[0080] Thereafter, a mold is used to apply pressure to the transfer film 10 so that the sub-ink area 210 of the first area 110 is adhered to the corresponding transfer area 310 and the connecting area 330, and the second area 120 is stretched to be opposite to the corresponding light-transmitting area 320, thereby facilitating the one-to-one corresponding pasting of the multiple sub-ink areas 210 of the transfer film 10 and the multiple transfer areas 310 of the optical substrate 20.

[0081] Finally, the supporting substrate 100 is separated from the sub-ink area 210 by heating or light dissociation, so that the sub-ink area 210 is transferred to the optical substrate 20. The transfer is completed to obtain the optical element 30.

[0082] The transfer film 10 provided in the present application can transfer the sub-ink area 210 to the transfer area 310 on the optical base 20, so that the outgoing light of the image generation unit can be emitted from the light-transmitting area 320 of the optical base 20, and the sub-ink area 210 is provided on the transfer area 310 of the optical base 20, so as to block the backflowing sunlight and reduce the energy of the backflowing sunlight to the image generation unit. At the same time, the transfer film 10 of the present application is clearly divided into zones, the first zone 110 is used to carry the sub-ink area 210, and the second zone 120 is used to correspond to the light-transmitting area 320, so as to prevent the ink from being stained on the light-transmitting area 320 and affecting the light emission of the optical element 30 formed by the transfer. In addition, the elastic modulus of the second region 120 of the present application is smaller than that of the first region 110, so that for the transfer of light-emitting surfaces of optical substrates 20 of different shapes, the second region 120 has a certain stretching range. On the one hand, the second region 120 can adapt to the light-emitting surfaces of different shapes for corresponding stretching, thereby facilitating the precise alignment of the sub-ink region 210 and the transfer region 310 of the optical substrate 20, and having a better transfer effect, so that the optical element 30 has a better effect of blocking sunlight backflow. On the other hand, the elastic modulus of the second region 120 is smaller, so that when the transfer film 10 is deformed, the second region 120 can be stretched first, avoiding the first region 110 carrying the sub-ink region 210 from being stretched and deformed, resulting in uneven splitting of the sub-ink region 210 it carries, affecting the transfer effect of the ink on the optical substrate 20, and avoiding uneven distribution of ink in the transfer region 310 on the optical substrate 20, affecting its blocking effect of backflowing sunlight. That is, the transfer film 10 of the present application has a better transfer effect. The optical element 30 formed by transfer using the transfer film 10 of the present application has a more uniform ink distribution and has a better blocking effect on backflow of sunlight.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A transfer film, characterized in that: The transfer film comprises: A carrier base layer, comprising a plurality of first regions and a plurality of second regions, wherein the plurality of first regions are arranged at intervals along a first direction, the second region is arranged between two adjacent first regions, and an elastic modulus of the second region is smaller than an elastic modulus of the first region; and A light shielding layer is disposed on the carrier substrate, the light shielding layer comprises a plurality of sub-ink areas which are disposed in a one-to-one correspondence in the first area, and the transfer film is used to transfer the light shielding layer to an optical substrate to form an optical element; Wherein, the first direction is parallel to the side of the supporting base layer toward the light shielding layer.

2. The transfer film according to claim 1, characterized in that: The second region is provided with a plurality of via holes, the plurality of via holes are arranged at intervals along the second direction, and the via holes are arranged through the second region along the thickness direction of the carrier substrate; The second direction is parallel to the side of the supporting substrate facing the light shielding layer, and the first direction and the second direction intersect with each other.

3. The transfer film according to claim 1, characterized in that: The adhesion between the light-shielding layer and the optical base is greater than the adhesion between the light-shielding layer and the supporting base.

4. The transfer film according to claim 1, characterized in that: The material of the supporting base layer includes polyethylene terephthalate, polycarbonate, acrylonitrile-butadiene-styrene, polyethylene naphthalate, polyolefin or polyethylene.

5. An optical element, characterized in that: The optical element comprises: ontology; a plurality of pyramidal portions protruding from the body, the plurality of pyramidal portions being sequentially arranged along the first direction, the light-emitting surface of each pyramidal portion comprising a transfer area and a light-transmitting area sequentially arranged along the first direction, and a connecting area connected between the transfer area and the light-transmitting area, and a preset angle being formed between a plane where the transfer area is located and a plane where the light-transmitting area is located; and A shading layer is arranged on the pyramidal portion, and the shading layer is formed by transferring the transfer film sheet described in any one of claims 1 to 4 onto the pyramidal portion, the sub-ink area of ​​the first area is at least partially arranged in the transfer area and the connecting area, and the second area is opposite to the light-transmitting area.

6. The optical element according to claim 5, characterized in that The connection area and the light-transmitting area are located in the same plane, and the connection area and the transfer area form the preset angle.

7. The optical element according to claim 6, characterized in that The dimension of the transfer area along the direction from the adjacent light-transmitting area to the adjacent connecting area is a, the dimension of the connecting area along the direction from the adjacent transfer area to the adjacent light-transmitting area is b, the dimension of the light-transmitting area along the direction from the adjacent connecting area to the adjacent transfer area is c, the distance between the connecting area and the body close to the transfer area is H, the dimension of the first area along the first direction is L1, and the dimension of the second area along the first direction is L2, then the sum of the dimensions of the first area and the second area along the first direction L1+L2 satisfies: 。 8. The optical element according to claim 5, characterized in that The size of the second region along the first direction is L2, the size of the light-transmitting region along the direction from the adjacent connecting region to the adjacent transfer region is c, and the stretching rate X of the second region satisfies: X≥c / L2.

9. A head-up display system, characterized in that: The head-up display system includes the optical element as described in any one of claims 5 to 8, and the head-up display system also includes an image generation unit, the optical element is arranged on the light-emitting side of the image generation unit, and the output light of the image generation unit is emitted from the light-transmitting area of ​​the optical element.

10. A transfer method, characterized in that: The transfer method comprises: Provide an optical substrate and a transfer film according to any one of claims 1 to 4, wherein the optical substrate comprises a body and a plurality of pyramidal portions protruding from the body, the plurality of pyramidal portions are sequentially arranged along the first direction, a light-emitting surface of each pyramidal portion comprises a transfer area and a light-transmitting area sequentially arranged along the first direction, and a connecting area connected between the transfer area and the light-transmitting area, and a preset angle is formed between a plane where the transfer area is located and a plane where the light-transmitting area is located; The optical substrate and the transfer film are placed opposite to each other, and the sub-ink area of ​​the first region of the transfer film is aligned with the transfer area corresponding to the optical substrate; Applying pressure to the transfer film by using a grinding tool so that the sub-ink area of ​​the first area is attached to the corresponding transfer area and the connecting area, and the second area is stretched to be opposite to the corresponding light-transmitting area; The carrier substrate is separated from the sub-ink area by heating dissociation or light dissociation to obtain the optical element.

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