Preparation equipment of holographic diffusion film
By designing a holographic diffusion film preparation device that can adjust the light incident angle, the single diffraction angle problem caused by the fixation of light angle in traditional equipment is solved, and the diversification of the application scenarios of holographic diffusion films and the improvement of display effects is achieved.
Patent Information
- Application Number
- CN202420492011.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-13
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-03-13
AI Technical Summary
In traditional holographic diffusion film preparation equipment, the angle of incident light is fixed, resulting in a relatively single diffraction angle of the prepared holographic diffusion film, which limits its application scenarios.
A holographic diffusion film preparation device is designed, including a first light source module, a preparation device and a position adjustment module. The device guides object light and reference light to the holographic material through the first guidance module and the second guidance module, and adjusts the incident angle of the light through the position adjustment module to achieve adjustability of the incident angle of the light.
By adjusting the incident angle of light, the diffraction angle of the holographic diffusion film can be adjusted, making its application scenarios more diverse. Specifically, when a larger display area is needed, the diffraction angle is increased; conversely, when a smaller display area is needed, the diffraction angle is reduced, thereby improving the display brightness and privacy.
Smart Images
Figure CN222979817U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging technology, and more specifically, to a preparation device for a holographic diffusion film. Background Art
[0002] During the preparation process of the holographic diffusion film, a beam of light is incident on each of the opposite sides of the holographic material for interference exposure, so that the holographic material can record the interference information of the two beams of light to form a holographic diffusion film.
[0003] Specifically, when light is incident on the holographic diffusion film along the direction of one of the beams of light (i.e., the object light), the diffracted light generated by it will exit along the direction of the other beam of light (i.e., the reference light). That is to say, the holographic diffusion film will only diffract the incident light in a specific direction and exhibit good transmittance in other incident directions. This characteristic makes the holographic diffusion film have significant advantages in transparent display technology.
[0004] However, in the traditional preparation device of the holographic diffusion film, the incident angles of the two beams of light incident on the holographic material are often fixed values, so that the diffraction angle of the prepared holographic diffusion film is relatively single. Summary of the Utility Model
[0005] An embodiment of this application provides a preparation device for a holographic diffusion film. The preparation device for the holographic diffusion film includes a first light source module, a preparation device, and a pose adjustment module. Among them, the first light source module is used to generate a first object light and a first reference light. The preparation device includes a carrying module, a first guiding module, and a second guiding module. The carrying module is used to place the first holographic material to be processed. The first guiding module is arranged on the optical path of the first object light and is used to guide the first object light to the first holographic material. The second guiding module is arranged on the optical path of the first reference light and is used to guide the first reference light to the first holographic material so that the first reference light interferes with the first object light incident on the first holographic material. The first guiding module is movably connected to the pose adjustment module, and the pose adjustment module is used to adjust the spatial pose of the first guiding module to adjust the angle of the first object light incident on the first holographic material. The pose adjustment module is also used to adjust the angle of the first reference light incident on the first holographic material.
[0006] Among them, in some possible embodiments, the first guiding module includes a first reflecting member, and the first reflecting member is located on the optical path where the first object light is located. The pose adjustment module includes a first guiding member and a first rotating member; the first reflecting member is movably connected to the first guiding member through the first rotating member. The first reflecting member moves under the guidance of the first guiding member and deflects under the drive of the first rotating member to reflect the first object light and adjust the position and angle of the first object light incident on the first holographic material.
[0007] Among them, in some possible embodiments, the second guiding module includes a second reflector, and the second reflector is located on the optical path where the first reference light is located. The pose adjustment module further includes a second guiding member and a second rotating member; the second reflector is movably connected to the second guiding member through the second rotating member. The second reflector moves under the guidance of the second guiding member and deflects under the drive of the second rotating member to reflect the first reference light and adjust the position and angle of the first reference light incident on the first holographic material.
[0008] Among them, in some possible embodiments, the preparation device further includes a first diffuser, and the first diffuser is disposed between the first guiding module and the first holographic material and is located on the optical path where the first object light is located; or / and, the preparation device further includes a second diffuser, and the second diffuser is disposed between the second guiding module and the first holographic material and is located on the optical path where the first reference light is located.
[0009] Among them, in some possible embodiments, the carrying module includes a third guiding member and a carrier for placing the first holographic material. The carrier is movably connected to the third guiding member and moves under the guidance of the third guiding member to change the positions where the first object light and the first reference light are incident on the first holographic material.
[0010] Among them, in some possible embodiments, the second guiding module includes a first beam splitter, and the pose adjustment module further includes an optical modulator. The first beam splitter and the optical modulator are sequentially disposed on the optical path where the first reference light is located. The first beam splitter is used to transmit the first reference light to the optical modulator, and the optical modulator is used to adjust the angle of the first reference light so that the incident angles corresponding to different regions of the first reference light incident on the first holographic material are different; the first beam splitter is further used to reflect the first reference light modulated by the optical modulator to the first holographic material.
[0011] Among them, in some possible embodiments, the second guiding module further includes a lens, and the lens is disposed between the first beam splitter and the first holographic material and is located on the optical path of the modulated first reference light.
[0012] Among them, in some possible embodiments, the first guiding module includes a third reflector, and the third reflector is located on the optical path where the first object light is located. The pose adjustment module includes a third guiding member and a third rotating member; the third reflector is movably connected to the third guiding member through the third rotating member. The third reflector moves under the guidance of the third guiding member and deflects under the drive of the third rotating member to adjust the angle of the first object light incident on the first holographic material.
[0013] Among them, in some possible embodiments, the first light source module includes a light source component and a second beam splitter. The light source component is used to generate a specified light. The second beam splitter is disposed on the optical path where the specified light is located and is used to split the specified light to generate a first object light and a first reference light.
[0014] Among them, in some possible embodiments, the preparation device further includes a replication device. The replication device is used to generate a second object light and prepare a holographic diffuser film based on a holographic diffuser film master. The holographic diffuser film master is prepared by the above-mentioned preparation device.
[0015] Among them, in some possible embodiments, the replication device includes a second light source module, a replication module, and a third guiding module. The second light source module is used to generate a second object light. The replication module is disposed on the optical path where the second object light is located. The replication module includes a substrate for carrying the holographic diffuser film master. The side of the substrate facing away from the second light source module is used to place the holographic diffuser film master. The side of the substrate facing the second light source module is adapted to be provided with a second holographic material to be processed. The third guiding module is disposed on the optical path where the second object light is located and is used to adjust the position and angle of the second object light incident on the second holographic material. The second object light passes through the second holographic material and the substrate in sequence and then is incident on the holographic diffuser film master to form a second reference light. The second reference light passes through the substrate and then interferes with the second object light incident on the second holographic material.
[0016] Among them, in some possible embodiments, the third guiding module includes a fourth reflector, a fourth guiding member, and a fourth rotating member. The fourth reflector is located on the optical path where the second object light is located. The fourth reflector is movably connected to the fourth guiding member through the fourth rotating member. The fourth reflector moves under the guidance of the fourth guiding member and deflects under the drive of the first rotating member to reflect the first object light and adjust the position and angle of the first object light incident on the first holographic material.
[0017] The embodiment of the present application provides a preparation device for a holographic diffuser film. The preparation device for the holographic diffuser film includes a first light source module, a preparation device, and a pose adjustment module. Among them, the first light source module is used to generate a first object light and a first reference light. The preparation device includes a carrying module for placing a first holographic material to be processed, a first guiding module, and a second guiding module. The first guiding module is movably connected to the pose adjustment module.
[0018] In one aspect, the pose adjustment module can adjust the spatial pose of the first guiding module to adjust the angle at which the first object light is incident on the first holographic material. In another aspect, the pose adjustment module can also adjust the angle at which the first reference light is incident on the first holographic material. Therefore, in the present application, the angles at which the first object light and the first reference light are incident on the first holographic material are adjustable. That is to say, the diffraction angle of the holographic diffusion film made of the first holographic material is also adjustable, making the application scenarios of the holographic diffusion film more diverse.
[0019] Specifically, when the display screen using the holographic diffusion film requires a larger display area, the pose adjustment module can increase the incident angle of the first reference light, thereby increasing the diffraction angle of the diffracted light to increase the display area of the display screen, so that users can view the display screen of the display even when deviating from the viewing position. Conversely, when the display screen using the holographic diffusion film requires a smaller display area, the pose adjustment module can reduce the incident angle of the first reference light, thereby reducing the diffraction angle of the diffracted light to reduce the display area of the display screen. On the one hand, the reduction of the display area can improve the display brightness and display quality; on the other hand, the reduction of the display area enables users to view the display screen only in a specified area, which can improve the privacy of users when viewing the screen. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of the preparation device of the holographic diffusion film provided by the embodiment of the present application.
[0022] Figure 2 It is another schematic structural diagram of the preparation device of the holographic diffusion film provided by the embodiment of the present application.
[0023] Figure 3 It is a schematic diagram of the application scenario of the holographic diffusion film provided by the embodiment of the present application.
[0024] Figure 4 It is a schematic structural diagram of the replication device in the preparation device provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of this application.
[0026] The preparation device 100 of a holographic diffusion film is provided in an embodiment of this application. Among them, the holographic diffusion film is an optical device made by interfering and exposing a holographic material with two beams of light, and it can record the interference information of the two beams of light. Specifically, when light is incident on the holographic diffusion film along the direction of one of the beams of light (i.e., the object light), the diffracted light generated by it will exit along the direction of the other beam of light (i.e., the reference light), so that the holographic diffusion film will only diffract the incident light in a specific direction and exhibit good transmittance in other incident directions. Therefore, the holographic diffusion film has advantages such as high diffraction efficiency, simple preparation process, and being convenient to be integrated into a display system.
[0027] In this embodiment, the preparation device 100 of the holographic diffusion film may include a first light source module 10, a preparation device 20, and a pose adjustment module 30. Among them, the first light source module 10 is used to generate a first object light W1 and a first reference light C1. The preparation device 20 includes a carrying module 210, a first guiding module 230, and a second guiding module 250. The carrying module 210 is used to place the first holographic material 200 to be processed. The first guiding module 230 is arranged on the optical path of the first object light W1 and is used to guide the first object light W1 to the first holographic material 200. The second guiding module 250 is arranged on the optical path of the first reference light C1 and is used to guide the first reference light C1 to the first holographic material 200, so that the first reference light C1 interferes with the first object light W1 incident on the first holographic material 200.
[0028] The first guiding module 230 is movably connected to the pose adjustment module 30. The pose adjustment module 30 is used to adjust the spatial pose of the first guiding module 230 to adjust the angle at which the first object light W1 is incident on the first holographic material 200. The pose adjustment module 30 is also used to adjust the angle at which the first reference light C1 is incident on the first holographic material 200. Therefore, in this application, the angles at which the first object light W1 and the first reference light C1 are incident on the first holographic material 200 are adjustable. That is to say, the diffraction angle of the holographic diffusion film made of the first holographic material 200 is also adjustable, making the application scenarios of this holographic diffusion film more diverse.
[0029] Specifically, when the display screen applying the holographic diffusion film requires a large display area, the incident angle of the first reference light C1 can be increased through the pose adjustment module 30, thereby increasing the diffraction angle of the diffracted light to increase the display area of the display screen, so that users can view the display picture of the display screen even when deviating from the viewing position. Conversely, when the display screen applying the holographic diffusion film requires a small display area, the incident angle of the first reference light C1 can be decreased through the pose adjustment module 30, thereby decreasing the diffraction angle of the diffracted light to decrease the display area of the display screen. On the one hand, the reduction of the display area can improve the display brightness and the display quality; on the other hand, the reduction of the display area enables users to view the display picture only in a specified area, which can improve the privacy of users when viewing the picture.
[0030] Next, the specific implementation manner of the preparation device 100 of the holographic diffusion film will be introduced.
[0031] In this embodiment, the first light source module 10 is used to generate the first object light W1 and the first reference light C1, where both the first object light W1 and the first reference light C1 are lasers. In some possible embodiments, the first light source module 10 may include two laser generators, one of which is used to generate the first object light W1 and the other is used to generate the first reference light C1.
[0032] In some other possible embodiments, the first light source module 10 may include a light source assembly 120 and a second beam splitter 140, where the light source assembly 120 is used to generate the specified light D. Specifically, the light source assembly 120 may include a laser generator for generating the specified light D. The second beam splitter 140 is disposed on the optical path where the specified light D is located and is used to split the specified light to generate the first object light W1 and the first reference light C1. Specifically, the second beam splitter 140 may be formed by splicing two triangular prisms, and an optical coating may be provided on the splicing surface of the two triangular prisms. Among them, a part of the specified light D can pass through the optical coating to form the first object light W1, and the other part of the specified light D can be reflected by the optical coating to form the first reference light C1. Therefore, in this embodiment, only one laser generator is required to generate two beams of light, thereby reducing the hardware cost of the preparation device 100.
[0033] In this embodiment, the preparation device 20 may include a carrying module 210, a first guiding module 230, and a second guiding module 250. The carrying module 210 is used to place the first holographic material 200 to be processed. Specifically, the carrying module 210 may be a carrying platform, and the first holographic material 200 may be attached to or clamped on the carrying platform. The first guiding module 230 and the second guiding module 250 are respectively movably connected to the pose adjustment module 30, so that the pose adjustment module 30 can adjust the spatial pose of the first guiding module 230 to adjust the angle at which the first object light W1 is incident on the first holographic material 200, and the pose adjustment module 30 can also adjust the spatial pose of the second guiding module 250 to adjust the angle at which the first reference light C1 is incident on the first holographic material 200.
[0034] It should be noted here that for the existing holographic diffuser film, the entire holographic diffuser film only has a high diffraction efficiency for light incident in a specific direction, and transmits light incident in a non-specific direction. Therefore, when this holographic diffuser film is applied to a display screen, since the directions of the projection light emitted by the projection display device are different, the diffraction efficiencies of the projection light at different positions of the holographic diffuser film are also different, resulting in poor brightness uniformity of the diffracted light emitted by the display screen.
[0035] To solve the above problems, the present application adopts a preparation method of preparing the holographic diffuser film in regions. Specifically, the positions where the first object light W1 and the first reference light C1 are respectively incident on the first holographic material 200 are also constantly changing. That is to say, the angles and positions of the two beams of light incident on the first holographic material 200 in this embodiment are constantly changing. Therefore, in this embodiment, by adopting a preparation method of performing regional exposure on the first holographic material 200, and the incident directions of the first object light W1 and the first reference light C1 corresponding to different regions are different, the outgoing directions of the diffracted light corresponding to different regions are also different, so that the holographic diffuser film made by the preparation device 100 can achieve different display effects. For example, the brightness uniformity and color uniformity in different regions of the holographic diffuser film can be adjusted, etc.
[0036] The following will respectively combine Figure 1 and Figure 2 to introduce the specific implementation manners of the preparation device 20 and the pose adjustment module 30.
[0037] In Figure 1In the illustrated embodiment, the first guiding module 230 not only adjusts the angle at which the first object light W1 is incident on the first holographic material 200 under the action of the pose adjustment module 30, but also adjusts the position at which the first object light W1 is incident on the first holographic material 200 under the action of the pose adjustment module 30. Similarly, the second guiding module 250 not only adjusts the angle at which the first reference light C1 is incident on the first holographic material 200 under the action of the pose adjustment module 30, but also adjusts the position at which the first reference light C1 is incident on the first holographic material 200 under the action of the pose adjustment module 30.
[0038] Specifically, the first guiding module 230 may include a first reflector 2320. The first reflector 2320 is located on the optical path of the first object light W1 and is used to reflect the first object light W1 to the first holographic material 200. Specifically, the first reflector 2320 may be a mirror.
[0039] The pose adjustment module 30 may include a first guide 310 and a first rotating member 320. The first reflector 2320 is movably connected to the first guide 310 through the first rotating member 320. Therefore, the first reflector 2320 moves under the guidance of the first guide 310 and deflects under the drive of the first rotating member 320 to reflect the first object light W1 and adjust the position and angle at which the first object light W1 is incident on the first holographic material 200. Specifically, the first rotating member 320 may be a rotary motor, and the output end of the rotary motor is connected to the first reflector 2320 so that the first reflector 2320 deflects under the drive of the rotary motor. The first guide 310 may be a guide rail, and the rotary motor is movably connected to the guide rail so that the guide rail can drive the rotary motor and the first reflector 2320 connected to the rotary motor to move. The moving direction of the first guide 310 here may be the direction in which the first object light W1 is incident on the first reflector 2320.
[0040] Similarly, the second guiding module 250 may include a second reflector 2520. The second reflector 2520 is located on the optical path of the first reference light C1 and is used to reflect the first reference light C1 to the first holographic material 200. Specifically, the first reference light C1 and the first object light W1 incident on the first holographic material 200 are respectively located on opposite sides of the first holographic material 200 and interfere with each other. Among them, the first reflector 2320 may be a mirror.
[0041] The pose adjustment module 30 may further include a second guiding member 330 and a second rotating member 340. The second reflecting member 2520 is movably connected to the second guiding member 330 through the second rotating member 340. Therefore, the second reflecting member 2520 moves under the guidance of the second guiding member 330 and deflects under the drive of the second rotating member 340, so as to reflect the first reference light C1 and adjust the position and angle of the first reference light C1 incident on the first holographic material 200. Specifically, the second rotating member 340 may be a rotating motor, and the output end of the rotating motor is connected to the second reflecting member 2520, so that the second reflecting member 2520 deflects under the drive of the rotating motor. The second guiding member 330 may be a guide rail, and the rotating motor is movably connected to the guide rail, so that the guide rail can drive the rotating motor and the second reflecting member 2520 connected to the rotating motor to move. The moving direction of the second guiding member 330 here may be the direction in which the first reference light C1 is incident on the second reflecting member 2520.
[0042] In some possible embodiments, the preparation device 20 may further include a first diffusing member 260. The first diffusing member 260 is disposed between the first guiding module 230 and the first holographic material 200 and is located on the optical path of the first object light W1. The first diffusing member 260 can scatter the first object light W1. On the one hand, the first diffusing member 260 can increase the divergence angle of the first object light W1, so that a larger picture display area can be obtained when the manufactured holographic diffusion film is applied. On the other hand, the first diffusing member 260 can disrupt the wavefront of the first object light W1 to improve the subsequent interference exposure quality. Specifically, the first diffusing member 260 can avoid the problem of uneven beam intensity caused by Newton's rings formed by particles such as dust in the first object light W1, making the light intensity of the first object light W1 more uniform. Specifically, the first diffusing member 260 may be frosted glass, a light homogenizing rod, an organic diffusion film, and the like.
[0043] In some possible embodiments, the preparation device 20 may further include a second diffusing member 270. The second diffusing member 270 is disposed between the second guiding module 250 and the first holographic material 200 and is located on the optical path of the first reference light C1. The second diffusing member 270 can scatter the first reference light C1. On the one hand, the second diffusing member 270 can increase the divergence angle of the first reference light C1, so that a larger picture display area can be obtained when the manufactured holographic diffusion film is applied. On the other hand, the second diffusing member 270 can disrupt the wavefront of the first reference light C1 to improve the subsequent interference exposure quality. Specifically, the second diffusing member 270 can avoid the problem of uneven beam intensity caused by Newton's rings formed by particles such as dust in the first reference light C1, making the light intensity of the first reference light C1 more uniform. Specifically, the second diffusing member 270 may be frosted glass, a light homogenizing rod, an organic diffusion film, and the like.
[0044] Please refer to Figure 2 , in this embodiment, the sub-region exposure of the first holographic material 200 is achieved by moving the position of the first holographic material 200. The first guiding module 230 adjusts the angle at which the first object light W1 is incident on the first holographic material 200 under the action of the pose adjustment module 30. The pose adjustment module 30 can also directly adjust the angle at which the first reference light C1 is incident on the first holographic material 200.
[0045] Specifically, the carrier module 210 may include a third guiding member 2120 and a carrier 2140 for placing the first holographic material 200. The carrier 2140 is movably connected to the third guiding member 2120 and moves under the guidance of the third guiding member 2120, so that the positions where the first object light W1 and the first reference light C1 are incident on the first holographic material 200 are changed. Specifically, the carrier 2140 may be a carrier table, and the first holographic material 200 may be attached to or clamped on the carrier table. The third guiding member 2120 may be a guide rail, and the carrier 2140 is movably connected to the guide rail, so that the guide rail can drive the carrier 2140 and the first holographic material 200 connected to the carrier 2140 to move, so as to achieve sub-region exposure of the first holographic material 200.
[0046] Specifically, the first guiding module 230 may include a third reflecting member 2340. The third reflecting member 2340 is located on the optical path of the first object light W1 and is used to reflect the first object light W1 to the first holographic material 200. Specifically, the third reflecting member 2340 may be a reflecting mirror.
[0047] The pose adjustment module 30 includes a third guiding member 350 and a third rotating member 360. The third reflecting member 2340 is movably connected to the third guiding member 350 through the third rotating member 360. Therefore, the third reflecting member 2340 moves under the guidance of the third guiding member 350 and deflects under the drive of the third rotating member 360 to adjust the angle at which the first object light W1 is incident on the first holographic material 200. Specifically, the third rotating member 360 may be a rotating motor, and the output end of the rotating motor is connected to the third reflecting member 2340, so that the third reflecting member 2340 deflects under the drive of the rotating motor. The third guiding member 350 may be a guide rail, and the rotating motor is movably connected to the guide rail, so that the guide rail can drive the rotating motor and the third guiding member 350 connected to the rotating motor to move, so that the spatial position where the first object light W1 is incident on the first holographic material 200 remains unchanged. The moving direction of the third guiding member 350 here may be the direction in which the first object light W1 is incident on the third reflecting member 2340.
[0048] Specifically, the second guiding module 250 may include a first beam splitter 2540, and the pose adjustment module 30 may further include a spatial light modulator (SLM) 370. The first beam splitter 2540 and the spatial light modulator 370 are sequentially arranged on the optical path where the first reference light C1 is located. Among them, the first beam splitter 2540 is configured to transmit the first reference light C1 to the spatial light modulator 370, and the spatial light modulator 370 is configured to modulate the first reference light C1 to adjust the angle of the first reference light C1, so that the incident angles corresponding to different regions of the first reference light C1 when it is incident on the first holographic material 200 are different. Therefore, under the action of the spatial light modulator 370, the angle distribution of the first reference light C1 on the first holographic material 200 can be flexibly adjusted. Specifically, the determination method of the angle distribution of the first reference light C1 on the first holographic material 200 will be introduced in detail below.
[0049] The first beam splitter 2540 is further configured to reflect the first reference light C1 modulated by the spatial light modulator 370 to the first holographic material 200. Specifically, the first beam splitter 2540 may be formed by splicing two triangular prisms, and an optical coating may be provided on the splicing surface of the two triangular prisms. Among them, the unmodulated first reference light C1 can pass through the optical coating and then be incident on the spatial light modulator 370, and the modulated first reference light C1 can be reflected by the optical coating to the first holographic material 200.
[0050] In some possible embodiments, the spatial light modulator 370 may be a deformable mirror, a digital mirror device (DMD), a metasurface, a phase retarder, a liquid crystal spatial light modulator (LC-SLM), etc. Here, taking the spatial light modulator 370 as an intensity-type SLM as an example, different positions on the SLM correspond one-to-one with the incident directions of the first object light W1 incident on the first holographic material 200. By loading different patterns on the SLM, the direction and brightness distribution of the first reference light C1 can be controlled.
[0051] For example, in order to make the diffracted light emitted by the holographic diffusion film have good angular uniformity, the SLM may be loaded with an image with uniform brightness. For another example, the incident first reference light C1 on the first holographic material 200 can also be made to propagate only along a specific angle by changing the loaded image of the SLM, so that the diffracted light emitted by the holographic diffusion film also propagates along a specific angle, which can improve the privacy of the user when viewing the picture. For another example, the propagation direction and divergence angle of the first reference light C1 can also be changed by using a phase-type SLM, so as to adjust the diffusion angle and direction of the holographic diffusion film.
[0052] In this embodiment, the optical modulator 370 can load different images through a controller (e.g., a computer) adapted thereto, thereby adjusting the propagation direction of the first reference light C1. On the one hand, the controller adapted to the optical modulator 370 can be easily integrated into an automated production line, making the preparation device 100 easier to set up. On the other hand, the optical modulator 370 has a stronger ability to control the display effect of the holographic diffusion film, enabling better brightness uniformity and field-of-view uniformity.
[0053] In some possible embodiments, the second guiding module 250 may further include a lens 2560. The lens 2560 is disposed between the first beam splitter 2540 and the first holographic material 200 and is located on the optical path where the modulated first reference light C1 is located. In this case, the modulated first reference light C1 converges after passing through the lens 2560, so that when it is incident on the first holographic material 200, its angular spectrum intensity distribution can be more uniform, ensuring that the diffracted light emitted from the subsequent holographic diffusion film has better angular uniformity.
[0054] In some possible embodiments, the angular distributions of the first object light W1 and the first reference light C1 on the first holographic material 200 can be determined by the application scenario of the holographic diffusion film made of the first holographic material 200. Taking the application of the holographic diffusion film to a display screen as an example, the angular distributions of the first object light W1 and the first reference light C1 on the first holographic material 200 can be determined by the spatial position between the display screen and the projection optical machine and the size of the eyebox. Herein, the "eyebox" refers to the device for a user to view a projected image.
[0055] Please refer to Figure 3 , after the image generated by the microdisplay device in the projection optical machine is magnified by the projection lens, it is projected onto the display screen applied with the holographic diffusion film. Among them, the images formed at different positions of the microdisplay device are displayed in different regions of the display screen (e.g., point M, point N), and the light directions and angular distributions of the projection lens irradiating point M and point N are also different. Taking the XOY plane as an example, the coordinates of two points in the projection lens are respectively denoted as A(a1, a2) and B(b1, b2), and the coordinates of two points in the display screen are respectively denoted as M(x1, y1) and N(x2, y2). At this time, the central angle of the projection lens irradiating point M is
[0056]
[0057] The angular spread of the projection lens irradiating point M is
[0058]
[0059] Similarly, the coordinates of the upper end and the lower end of the eyebox are respectively denoted as C(c1, c2) and D(d1, d2). At this time, the central angle of the diffracted light emitted from the display screen is
[0060]
[0061] The divergence angle of the diffracted light emitted through the display screen is
[0062]
[0063] Similarly, the distribution of the central angle and the divergence angle of the display screen can also be obtained in the XOZ plane. Therefore, in a three-dimensional plane, for any point r(x, y, z) on the display screen, the irradiation direction and the angle distribution of the projection lens can be respectively denoted as r1(r) and Ω1(r), and the irradiation direction and the angle distribution of the diffracted light can be respectively denoted as r2(r) and Ω2(r). For the holographic diffusion film, r1(r) and Ω1(r) here respectively correspond to the propagation direction and the angle distribution of the first object light W1 incident on the first holographic material 200, and r2(r) and Ω2(r) here respectively correspond to the propagation direction and the angle distribution of the first reference light C1 incident on the first holographic material 200.
[0064] Specifically, the curved surface distribution of the projection lens is denoted as S1 here, and the coordinates of any point on the curved surface S1 are denoted as M(x1, y1, z1). At the same time, the curved surface distribution of the eyebox is denoted as S2, and the coordinates of any point on the curved surface S2 are denoted as N(x2, y2, z2). Then, for any point r(x, y, z) on the display screen, the propagation direction and the angle distribution of the first object light W1 are respectively
[0065]
[0066]
[0067] where θ(r1) and are respectively the elevation angle and the azimuth angle of the vector r1.
[0068] Similarly, the propagation direction and the angle distribution of the first reference light C1 are respectively
[0069]
[0070]
[0071] where θ(r2) and are respectively the elevation angle and the azimuth angle of the vector r2.
[0072] Therefore, in this embodiment, by setting the propagation directions and angular distributions of the first object light W1 and the first reference light C1 corresponding to each exposure area, it is possible to ensure that the diffracted light corresponding to each area is only received by the pupil within the eyebox. On the one hand, the display brightness, brightness uniformity, and field-of-view uniformity can be effectively improved. On the other hand, the privacy of the user when viewing the screen can also be enhanced.
[0073] Please refer to Figure 4 , the preparation device 100 may further include a replication device 40. The replication device 40 is used to generate a second object light W2 and prepare a holographic diffuser film based on the holographic diffuser film master 300, and the holographic diffuser film master 300 is made by the preparation device 20 described above. That is to say, the holographic diffuser film master 300 in this embodiment is the holographic diffuser film processed by the preparation device 20 for the first holographic material 200 above. Therefore, the preparation process of the holographic diffuser film in this embodiment includes: (1) First, make the holographic diffuser film master 300 through the Figure 1 or Figure 2 shown preparation device 100; (2) Then, replicate the holographic diffuser film master 300 through the Figure 4 shown replication device 40 to achieve mass production of the holographic diffuser film. Since only one path of light (i.e., the second object light W2) is required during the replication of the holographic diffuser film master 300, the hardware cost of the preparation device 100 can be reduced, and the working stability of the preparation device 100 can be greatly improved, and the process flow of mass-producing the holographic diffuser film can be simplified.
[0074] In this embodiment, the replication device 40 may include a second light source module 410, a replication module 430, and a third guiding module 450. Among them, the second light source module 410 is used to generate the second object light W2, and the second object light W2 is a laser. Specifically, the second light source module 410 may include a laser generator for generating the second object light W2.
[0075] The replication module 430 is disposed on the optical path where the second object light W2 is located. It includes a substrate 4320 for carrying the holographic diffuser film master 300. The side of the substrate 4320 facing away from the second light source module 410 is for placing the holographic diffuser film master 300, and the side of the substrate 4320 facing the second light source module 410 is suitable for setting the second holographic material 400 to be processed. That is to say, the second holographic material 400 and the holographic diffuser film master 300 are respectively disposed on opposite sides of the substrate 4320. Specifically, the substrate 4320 may be made of a transparent material (e.g., glass) to enable the second object light W2 to better transmit to the holographic diffuser film master 300.
[0076] The third guiding module 450 is disposed on the optical path where the second object light W2 is located, and is used to adjust the position and angle of the second object light W2 incident on the second holographic material 400. Specifically, the second object light W2 passes through the second holographic material 400 and the substrate 4320 in sequence and then is incident on the holographic diffusion film master 300 to form the second reference light C2. After passing through the substrate 4320, the second reference light C2 interferes with the second object light W2 incident on the second holographic material 400, thereby completing the replication of the holographic diffusion film master 300. It is not difficult to understand that the "second reference light C2" here is the diffracted light generated after the second object light W2 is incident on the holographic diffusion film master 300.
[0077] Specifically, the third guiding module 450 may include a fourth reflector 4520, a fourth guiding member 4540, and a fourth rotating member 4560. Among them, the fourth reflector 4520 is located on the optical path where the second object light W2 is located, and is used to reflect the second object light W2 to the second holographic material 400. Specifically, the fourth reflector 4520 may be a mirror.
[0078] The fourth reflector 4520 is movably connected to the fourth guiding member 4540 through the fourth rotating member 4560. So that the fourth reflector 4520 can move under the guidance of the fourth guiding member 4540 and deflect under the drive of the fourth rotating member 4560, so as to reflect the second object light W2 and adjust the position and angle of the second object light W2 incident on the second holographic material 400. Specifically, the fourth rotating member 4560 may be a rotating motor, and the output end of the rotating motor is connected to the fourth reflector 4520, so that the fourth reflector 4520 deflects under the drive of the rotating motor. The fourth guiding member 4540 may be a guide rail, and the rotating motor is movably connected to the guide rail, so that the guide rail can drive the rotating motor and the fourth reflector 4520 connected to the rotating motor to move. The moving direction of the fourth guiding member 4540 here may be the direction in which the second object light W2 is incident on the fourth reflector 4520.
[0079] Therefore, in this embodiment, the sub-region interference exposure of the second holographic material 400 is realized through the fourth reflector 4520, the fourth guiding member 4540, and the fourth rotating member 4560, so that the incident direction and angle distribution of the second object light W2 and the second reference light C2 can be continuously changed during exposure in different regions, so as to improve the display effect of the holographic diffusion film.
[0080] An embodiment of the present application provides a preparation device 100 for a holographic diffusion film. The preparation device 100 for the holographic diffusion film may include a first light source module 10, a preparation device 20, and a pose adjustment module 30. Among them, the first light source module 10 is used to generate a first object light W1 and a first reference light C1. The preparation device 20 includes a carrying module 210, a first guiding module 230, and a second guiding module 250. The carrying module 210 is used to place a first holographic material 200 to be processed. The first guiding module 230 is disposed on the optical path of the first object light W1 and is used to guide the first object light W1 to the first holographic material 200. The second guiding module 250 is disposed on the optical path of the first reference light C1 and is used to guide the first reference light C1 to the first holographic material 200, so that the first reference light C1 interferes with the first object light W1 incident on the first holographic material 200.
[0081] The first guiding module 230 is movably connected to the pose adjustment module 30. The pose adjustment module 30 is used to adjust the spatial pose of the first guiding module 230 to adjust the angle at which the first object light W1 is incident on the first holographic material 200. The second guiding module 250 is also used to adjust the angle at which the first reference light C1 is incident on the first holographic material 200. Therefore, in the present application, the angles at which the first object light W1 and the first reference light C1 are incident on the first holographic material 200 are adjustable. That is to say, the diffraction angle of the holographic diffusion film made of the first holographic material 200 is also adjustable, making the application scenarios of the holographic diffusion film more diverse.
[0082] Specifically, when the display screen using the holographic diffusion film requires a larger display area, the incident angle of the first reference light C1 can be increased through the pose adjustment module 30, thereby increasing the diffraction angle of the diffracted light to increase the display area of the display screen, so that users can view the display screen of the display even when deviating from the viewing position. On the contrary, when the display screen using the holographic diffusion film requires a smaller display area, the incident angle of the first reference light C1 can be reduced through the pose adjustment module 30, thereby reducing the diffraction angle of the diffracted light to reduce the display area of the display screen. On the one hand, the reduction of the display area can improve the display brightness and the display quality; on the other hand, the reduction of the display area enables users to view the display screen only in a specified area, which can improve the privacy of users when viewing the screen.
[0083] In the description of the present application, certain terms are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not distinguish components by the difference in names, but by the difference in functions of the components. As mentioned throughout the specification and claims, "including" is an open-ended term and should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.
[0084] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "inside", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0085] In the present application, unless otherwise clearly specified or limited, the terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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, or the communication inside two elements, or just surface contact. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0086] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although the technical solutions of this application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A holographic diffusion film preparation device, characterized in that: include: A first light source module, used for generating a first object light and a first reference light; A preparation device, comprising a carrying module, a first guiding module and a second guiding module, wherein the carrying module is used to place a first holographic material to be processed; The first guiding module is arranged on the optical path of the first object light and is used to guide the first object light to the first holographic material; The second guiding module is arranged on the optical path of the first reference light and is used to guide the first reference light to the first holographic material so that the first reference light interferes with the first object light incident on the first holographic material; as well as A posture adjustment module, wherein the first guide module can be movably connected to the posture adjustment module, and the posture adjustment module is used to adjust the angle of the first object light incident on the first holographic material by adjusting the spatial posture of the first guide module; the posture adjustment module is also used to adjust the angle of the first reference light incident on the first holographic material.
2. The preparation equipment according to claim 1, characterized in that: The first guiding module comprises a first reflecting member, and the first reflecting member is located on the optical path where the first object light is located; the posture adjusting module comprises a first guiding member and a first rotating member; the first reflecting member is movably connected to the first guiding member through the first rotating member; The first reflecting member moves under the guidance of the first guiding member and deflects under the driving of the first rotating member, so as to reflect the first object light and adjust the position and angle of the first object light incident on the first holographic material.
3. The preparation equipment according to claim 2, characterized in that: The second guiding module includes a second reflecting member, and the second reflecting member is located on the optical path where the first reference light is located; the posture adjusting module also includes a second guiding member and a second rotating member; the second reflecting member is movably connected to the second guiding member through the second rotating member; The second reflecting member moves under the guidance of the second guiding member and deflects under the driving of the second rotating member, so as to reflect the first reference light and adjust the position and angle at which the first reference light is incident on the first holographic material.
4. The preparation equipment according to claim 1, characterized in that: The preparation device further includes a first diffuser, which is disposed between the first guide module and the first holographic material and is located on the optical path of the first object light; or / and The preparation device further includes a second diffuser, which is disposed between the second guide module and the first holographic material and is located on an optical path where the first reference light is located.
5. The preparation equipment according to claim 1, characterized in that: The supporting module includes a third guide and a supporting member for placing the first holographic material. The supporting member is movably connected to the third guide and moves under the guidance of the third guide to change the positions at which the first object light and the first reference light are incident on the first holographic material.
6. The preparation device according to claim 5, characterized in that: The second guiding module includes a first beam splitter, and the posture adjustment module also includes an optical modulator, and the first beam splitter and the optical modulator are sequentially arranged on an optical path where the first reference light is located; The first beam splitter is used to transmit the first reference light to the light modulator, and the light modulator is used to adjust the angle of the first reference light so that the incident angles of the first reference light when incident on different areas of the first holographic material are different; the first beam splitter is also used to reflect the first reference light modulated by the light modulator to the first holographic material.
7. The preparation device according to claim 6, characterized in that: The second guiding module further includes a lens, which is disposed between the first beam splitter and the first holographic material and is located on an optical path where the modulated first reference light is located.
8. The preparation equipment according to claim 5, characterized in that: The first guiding module comprises a third reflecting member, and the third reflecting member is located on the optical path where the first object light is located; the posture adjusting module comprises a third guiding member and a third rotating member; the third reflecting member is movably connected to the third guiding member through the third rotating member; The third reflective member moves under the guidance of the third guide member, and is deflected under the driving of the third rotating member, so as to adjust the angle at which the first object light is incident on the first holographic material.
9. The preparation device according to any one of claims 1 to 8, characterized in that: The first light source module includes a light source assembly and a second beam splitter, and the light source assembly is used to generate designated light; The second beam splitter is disposed on the optical path where the designated light is located, and is used to split the designated light to generate the first object light and the first reference light.
10. The preparation device according to any one of claims 1 to 8, characterized in that: The preparation equipment also includes a replication device, which is used to generate a second object light and prepare a holographic diffusion film based on a holographic diffusion film master, wherein the holographic diffusion film master is prepared by the preparation device according to any one of claims 1 to 9.
11. The preparation device according to claim 10, characterized in that: The replication device comprises a second light source module, a replication module and a third guide module; the second light source module is used to generate the second object light; The replication module is arranged on the optical path where the second object light is located, and the replication module comprises a substrate for carrying the holographic diffusion film master; The side of the substrate facing away from the second light source module is used for placing the holographic diffusion film master; The side of the substrate facing the second light source module is suitable for arranging the second holographic material to be processed; The third guiding module is arranged on the optical path where the second object light is located, and is used for adjusting the position and angle of the second object light incident on the second holographic material; the second object light is incident on the holographic diffusion film master after being transmitted through the second holographic material and the substrate in sequence to form a second reference light; the second reference light interferes with the second object light incident on the second holographic material after being transmitted through the substrate.
12. The preparation device according to claim 11, characterized in that: The third guiding module comprises a fourth reflecting member, a fourth guiding member and a fourth rotating member, wherein the fourth reflecting member is located on the optical path where the second object light is located; The fourth reflective member is movably connected to the fourth guiding member through the fourth rotating member; the fourth reflective member moves under the guidance of the fourth guiding member and is deflected under the drive of the fourth rotating member to reflect the second object light and adjust the position and angle of the second object light incident on the second holographic material.