Polarizer holographic grating liquid crystal polymer film transfer device

Abstract

The invention discloses a polarizer holographic grating liquid crystal polymer film transfer device which comprises a rack, a first objective table, a second objective table, an identification assembly and a transfer assembly. The first objective table is arranged on the rack and is used for placing a substrate with a liquid crystal polymer film; the first objective table can drive the substrate to move; the second objective table is arranged on the rack and is used for placing a target substrate; the recognition assembly is used for recognizing the posture of the liquid crystal polymer film on the substrate, and the first objective table can drive the substrate to move according to feedback of the recognition assembly, so that the posture of the liquid crystal polymer film is adjusted to a target posture; after the liquid crystal polymer film is adjusted to a target posture, the transfer assembly is used for stripping the liquid crystal polymer film on the substrate, transferring the liquid crystal polymer film and adhering the liquid crystal polymer film to the target substrate, and transferring and adhering of the liquid crystal polymer film are repeated for several times, so that preparation of the polarizer holographic grating is achieved. The obtained polarization holographic grating is not provided with an orientation layer, so that the problems of the orientation layer can be avoided.

Description

Technical Field

[0001] This invention relates to the field of polarizing holographic grating fabrication technology, and particularly to a polarizing holographic grating liquid crystal polymer film transfer device. Background Technology

[0002] Currently, in the fabrication of polarizing holographic gratings (PVG), liquid crystal polymer films (liquid crystal layers) in the coupling / ejection regions are directly exposed on a glass substrate. However, this method suffers from instability in the alignment layer between the glass substrate and the liquid crystal polymer film, which can easily lead to the peeling of the liquid crystal polymer film. Summary of the Invention

[0003] In view of this, the present invention provides a liquid crystal polymer film transfer device for polarizing holographic gratings, which can peel off the liquid crystal polymer film from the alignment layer on the substrate and attach the liquid crystal polymer film to the target substrate with high precision. The transfer and attachment of the liquid crystal polymer film can be repeated several times, thereby realizing the fabrication of polarizing holographic gratings. In this way, there is no alignment layer in the polarizing holographic grating, thus avoiding the problem of the existence of the alignment layer.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A polarizer holographic grating liquid crystal polymer film transfer device includes: a stage, a first stage, a second stage, an identification component, and a transfer component;

[0006] The first stage is disposed on the frame and is used to place a substrate with a liquid crystal polymer film; wherein, the first stage is capable of moving the substrate.

[0007] The second stage is disposed on the frame and is used to place the target substrate;

[0008] The identification component is used to identify the orientation of the liquid crystal polymer film on the substrate. The first stage can drive the substrate to move according to the feedback of the identification component, so that the orientation of the liquid crystal polymer film is adjusted to the target orientation.

[0009] After the liquid crystal polymer film is adjusted to the target orientation, the transfer component is used to peel off the liquid crystal polymer film on the substrate, and then transfer and adhere the liquid crystal polymer film to the target substrate.

[0010] Preferably, the identification component is used to identify the position and angle of the liquid crystal polymer film on the substrate respectively. The first stage can move the substrate according to the position feedback of the identification component to adjust the position of the liquid crystal polymer film to the target position, and can move the substrate according to the angle feedback of the identification component to adjust the angle of the liquid crystal polymer film to the target angle.

[0011] Preferably, the recognition component includes: an image acquisition component and an illumination component;

[0012] The image acquisition component is used to identify the position of the liquid crystal polymer film on the substrate;

[0013] The irradiation component is used to irradiate the liquid crystal polymer film on the substrate and cause the liquid crystal polymer film to generate diffracted light rays in several specific directions. The image acquisition component is also used to acquire the directions of several diffracted light rays of the liquid crystal polymer film and determine the angle of the liquid crystal polymer film accordingly.

[0014] Preferably, the first stage can move the substrate according to the position feedback of the image acquisition component, so that the position of the liquid crystal polymer film is moved to the target position, and can also rotate the substrate according to the angle feedback of the image acquisition component, so that the angle of the liquid crystal polymer film reaches the target angle.

[0015] Preferably, it further includes a first guide rail, a first drive assembly, and a second drive assembly;

[0016] The first guide rail is disposed on the platform and located below the identification component;

[0017] The first stage and the second stage are slidably disposed on the first guide rail, and both can slide to below the recognition component;

[0018] The first drive component is disposed on the platform and is used to drive the first platform to slide along the first guide rail;

[0019] The second drive component is disposed on the platform and is used to drive the second platform to slide along the first guide rail.

[0020] Preferably, the transfer component is disposed on the platform and located above the first guide rail and is capable of sliding along the length direction of the first guide rail.

[0021] Preferably, the transfer assembly includes a transfer assembly for rolling up and sticking the liquid crystal polymer film on the substrate, and for rolling out and sticking the liquid crystal polymer film onto the target substrate.

[0022] Preferably, the transfer assembly includes: a support, a movable body, and transfer rollers;

[0023] The mobile body is mounted on the platform via the bracket, and its movable end can move back and forth and up and down between the first platform and the second platform.

[0024] The transfer roller is disposed at the movable end of the moving body and is used to roll up and roll out the liquid crystal polymer film; wherein, the adhesive force of the transfer roller is greater than the adhesive force of the liquid crystal polymer film on the substrate, but less than the adhesive force on the target substrate.

[0025] Preferably, the transfer roller is located above the substrate and the target substrate, and its axis is parallel to the substrate and the target substrate, respectively.

[0026] A method for fabricating a polarizing holographic grating, comprising the use of the polarizing holographic grating liquid crystal polymer thin film transfer device described above, the method comprising:

[0027] S1. Prepare a liquid crystal polymer film on a substrate and place the substrate with the liquid crystal polymer film on a first stage;

[0028] S2. Place the target substrate on the second stage;

[0029] S3. The orientation of the liquid crystal polymer film on the substrate is identified by the recognition component and fed back to the first stage. The first stage then moves the substrate according to the feedback, so that the orientation of the liquid crystal polymer film is adjusted to the target orientation.

[0030] S4. Use a transfer assembly to peel off the liquid crystal polymer film from the substrate and transfer the liquid crystal polymer film to the target substrate; wherein, the target substrate is coated with an adhesive layer;

[0031] S5. Apply an adhesive layer to the liquid crystal polymer film, and repeat steps S1, S3 and S4.

[0032] S6. Repeat step S5 until the fabrication of the polarizing holographic grating is complete.

[0033] As can be seen from the above technical solution, the polarizing holographic grating liquid crystal polymer film transfer device provided by the present invention can peel off the liquid crystal polymer film from the alignment layer on the substrate and bond the liquid crystal polymer film to the target substrate with high precision. By repeating the transfer and bonding of the liquid crystal polymer film several times, the polarizing holographic grating can be fabricated. In this way, the polarizing holographic grating fabricated does not have an alignment layer, thus avoiding the problem of the existence of an alignment layer and the problem of the liquid crystal polymer film peeling off easily due to the instability of the alignment layer. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the overall structure of the polarizer holographic grating liquid crystal polymer thin film transfer device provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the polarizer holographic grating liquid crystal polymer thin film transfer device provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of another perspective of the polarizing holographic grating liquid crystal polymer thin film transfer device provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the structure of the polarizer holographic grating liquid crystal polymer film transfer device provided in an embodiment of the present invention (the stand is omitted).

[0039] Figure 5 Another structural schematic diagram of the polarizer holographic grating liquid crystal polymer film transfer device provided in an embodiment of the present invention (the test stand is omitted).

[0040] Figure 6 A schematic diagram showing the arrangement of the first and second stages on the first guide rail, as provided in an embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of the structure of the transfer component provided in an embodiment of the present invention;

[0042] Figure 8 A schematic diagram showing the arrangement of the camera, laser, and light source on the column according to an embodiment of the present invention;

[0043] Figure 9 The diffraction pattern after laser irradiation is provided in an embodiment of the present invention.

[0044] Among them, 1 is the platform, 2 is the first platform, 3 is the cabinet, 4 is the transfer roller, 5 is the moving body, 6 is the second guide rail, 7 is the second platform, 8 is the image acquisition component, 9 is the first guide rail, 10 is the bracket, 11 is the connecting block, 12 is the first vacuum hole, 13 is the column, 14 is the slider, 15 is the laser, 16 is the camera, 17 is the light source, 18 is the light source socket, 19 is the first cable box, 20 is the pressure adjustment component, 21 is the carriage, 22 is the second vacuum hole, 23 is the rotation component, 24 is the lifting component, 25 is the first linear motor component, 26 is the second linear motor component, and 27 is the third linear motor component. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The polarizer holographic grating liquid crystal polymer thin film transfer device provided in this embodiment of the invention, such as... Figure 2 As shown, it includes: a platform 1, a first stage 2, a second stage 7, an identification component, and a transfer component;

[0047] The first stage 2 is disposed on the frame 1 and is used to place a substrate with a liquid crystal polymer film; wherein, the first stage 2 is capable of moving the substrate.

[0048] The second stage 7 is mounted on the frame 1 and is used to place the target substrate;

[0049] The recognition component is used to recognize the orientation of the liquid crystal polymer film on the substrate. The first stage 2 can drive the substrate to move according to the feedback of the recognition component, so that the orientation of the liquid crystal polymer film is adjusted to the target orientation.

[0050] After the liquid crystal polymer film is adjusted to the target orientation, the transfer component is used to peel off the liquid crystal polymer film on the substrate, and then transfer and adhere the liquid crystal polymer film to the target substrate.

[0051] It should be noted that, as Figure 1 As shown, this device also includes a cabinet 3, the lower part of which is a platform 1 (i.e., a rack); as Figure 2 As shown, the first stage 2 can be disposed on the frame 1 and is used to place a substrate (not shown in the figure) with a liquid crystal polymer film; wherein, the first stage 2 can have the function of rotating around the Z direction and moving in the XY direction, so as to drive the substrate on it to perform corresponding movements, so as to adjust the attitude of the liquid crystal polymer film to the target attitude; in addition, as Figure 6As shown, the first stage 2 may be provided with a first vacuum hole 12 for adsorbing a substrate with a liquid crystal polymer film; in addition, the liquid crystal polymer film (liquid crystal layer) can be prepared on the substrate using existing processes, and of course, there is an alignment layer between the liquid crystal polymer film and the substrate.

[0052] like Figure 2 As shown, the second stage 7 can be disposed on the frame 1 and is used to place the target substrate (not shown in the figure); wherein, the target substrate can be a target lens and can have an adhesive layer thereon for bonding the transferred liquid crystal polymer film;

[0053] The identification component can be mounted on the stage 1 and positioned above the first stage 2, and is used to identify the orientation of the liquid crystal polymer film on the substrate. The first stage 2 can also be moved below the identification component. The orientation of the liquid crystal polymer film includes its position and angle; that is, the identification component can be used to identify the position and angle of the liquid crystal polymer film on the substrate respectively. Furthermore, the first stage 2 can move the substrate according to the feedback from the identification component, adjusting the orientation of the liquid crystal polymer film to the target orientation, thus adjusting the position and angle of the liquid crystal polymer film to the target position and angle. Of course, this device can control the movement of the first stage 2 according to the feedback from the identification component through a control center, thereby adjusting the orientation of the liquid crystal polymer film to the target orientation. In other words, this solution, through the combined use of the identification component and the first stage 2, can achieve calibration of the liquid crystal polymer film's orientation, thereby facilitating the transfer component to precisely adhere the liquid crystal polymer film to the target substrate.

[0054] After the liquid crystal polymer film is adjusted to the target orientation, the transfer assembly is used to pick up and peel off the liquid crystal polymer film on the substrate, and then transfer and adhere the liquid crystal polymer film to the target substrate, thereby transferring the liquid crystal polymer film on the substrate to the target substrate with high precision. As mentioned above, the target substrate (or target substrate) has an adhesive layer, and the transferred liquid crystal polymer film can adhere to the target substrate. The transfer assembly can roll to pick up or flatly adhere the liquid crystal polymer film on the substrate. In addition, the above operation is repeated (e.g., three or four times) to sequentially adhere multiple layers of liquid crystal polymer films to the target substrate until the fabrication of the polarizer holographic grating is completed. Of course, the polarizer holographic grating finally fabricated in this way contains the target substrate (target lens) and multiple staggered adhesive layers and liquid crystal layers (liquid crystal polymer films), but does not contain an alignment layer, thus avoiding the problem of the alignment layer. Of course, when the transfer assembly picks up and peels off the liquid crystal polymer film, it has already separated the liquid crystal polymer film from the alignment layer on the substrate.

[0055] The polarizing holographic grating liquid crystal polymer film transfer device provided in this solution can peel the liquid crystal polymer film off the alignment layer on the substrate and bond the liquid crystal polymer film to the target substrate with high precision. By repeating the transfer and bonding of the liquid crystal polymer film several times, the polarizing holographic grating can be fabricated. In this way, the polarizing holographic grating fabricated does not have an alignment layer, thus avoiding the problems caused by the presence of an alignment layer and the problem of liquid crystal polymer film peeling due to the instability of the alignment layer.

[0056] In other words, the polarizing holographic grating liquid crystal polymer film transfer device provided in this solution can peel off the coupling / injection liquid crystal polymer film from the substrate and attach it to the target lens with high precision. This operation can realize the fabrication of polarizing holographic gratings, and the polarizing holographic gratings prepared in this way do not contain an alignment layer.

[0057] In this scheme, the identification component is used to identify the position and angle of the liquid crystal polymer film on the substrate respectively. The first stage 2 can drive the substrate to move according to the position feedback of the identification component, so that the position of the liquid crystal polymer film is adjusted to the target position. The first stage 2 can also drive the substrate to move according to the angle feedback of the identification component, so that the angle of the liquid crystal polymer film is adjusted to the target angle.

[0058] The identification component can be used to identify the position of the liquid crystal polymer film on the substrate and send the position information to the first stage 2. The first stage 2 then uses this position feedback to drive the substrate to perform corresponding movements (such as translation) so that the position of the liquid crystal polymer film moves to the target position. In addition, the identification component can also be used to identify the angle of the liquid crystal polymer film on the substrate and send the angle information to the first stage 2. The first stage 2 then uses this angle feedback to drive the substrate to perform corresponding movements (such as rotation) so that the angle of the liquid crystal polymer film is adjusted to the target angle, thereby ensuring that the position and angle of the liquid crystal polymer film on the substrate are at the target position. Of course, as mentioned above, the control center can control the movement of the first stage 2 based on the position feedback of the identification component to adjust the position of the liquid crystal polymer film to the target position, and control the movement of the first stage 2 based on the angle feedback of the identification component to adjust the angle of the liquid crystal polymer film to the target angle.

[0059] Specifically, such as Figure 3 As shown, the recognition component includes: an image acquisition component 8 and an illumination component;

[0060] Image acquisition component 8 is used to identify the position of the liquid crystal polymer film on the substrate;

[0061] The irradiation component is used to irradiate the liquid crystal polymer film on the substrate and cause the liquid crystal polymer film to generate diffracted light in several specific directions. The image acquisition component 8 is also used to acquire the directions of several diffracted light from the liquid crystal polymer film and determine the angle of the liquid crystal polymer film accordingly.

[0062] It should be noted that, as Figure 8 As shown, the identification component also includes a column 13, such as Figure 2 As shown, the column 13 can be mounted on the platform 1, and the image acquisition component 8 and the illumination component can be respectively mounted on the suspended ends of the top of the column 13; wherein, as Figure 8 As shown, the image acquisition component 8 can be a camera 16 (i.e., a CCD), and the illumination component can be a laser 16. The camera 16 can be used to identify the position of the liquid crystal polymer film on the substrate and can transmit the position information to the first stage 2. The first stage 2 then moves the substrate accordingly, causing the liquid crystal polymer film to move to the target position. Additionally, the laser 16 is used to illuminate the liquid crystal polymer film on the substrate and cause the liquid crystal polymer film to generate one or more diffracted rays in specific directions, such as... Figure 9 As shown, the liquid crystal polymer film can be made to produce diffracted light in two specific directions. Of course, it can also be made to produce diffracted light in one specific direction. The camera 16 is also used to collect the directions of one or more diffracted light rays from the liquid crystal polymer film and thereby determine the angle of the liquid crystal polymer film; furthermore, as... Figure 8 As shown, the identification component may further include: a light source 17 disposed on the column 13, used to illuminate the liquid crystal polymer film on the substrate, thereby facilitating the camera 16 to identify the position of the liquid crystal polymer film on the substrate; simultaneously, as Figure 8 As shown, the identification component may also include a slider 14, which is slidably mounted on the column 13. The light source 17 can be mounted on the slider 14 via a support frame, and the height of the light source 17 can be adjusted by the slider 14 to adjust the distance between the light source 17 and the liquid crystal polymer film.

[0063] Furthermore, it should be noted that the liquid crystal polymer film is used as the coupling and coupling-out area of ​​AR glasses. The liquid crystal polymer film is essentially a grating with a specific grating angle. The grating angles of the coupling and coupling-out areas must satisfy a specific relationship (the vector sum of two or three grating vectors must be equal to 0) in order to achieve AR display. The grating angle determines whether this specific relationship can be satisfied. Therefore, the angle of the liquid crystal polymer film needs to be adjusted to be very precise so that the grating vector sum of the two or three gratings in the coupling and coupling-out areas is equal to 0.

[0064] In addition, the laser 16 can irradiate the liquid crystal polymer film on the substrate, causing the liquid crystal polymer film to diffract in one or more specific directions. The camera 16 will collect the diffraction direction, and based on the deviation between the collected diffraction direction and the standard direction predetermined by the device, the device will transmit a specific command to the first stage 2 to make it perform corresponding activities (such as rotation) to ensure that the angle of the liquid crystal polymer film reaches the target angle. Of course, grasping the angle by diffraction direction will greatly improve the angle alignment accuracy compared with the traditional mechanical shape grasping. That is to say, the device will have a standard angle indication. The laser irradiation of the liquid crystal polymer film will produce light at a specific angle. The first stage 2 will drive the liquid crystal polymer film to perform corresponding activities according to the angle feedback of the camera 16 until the propagation direction of the light at this specific angle coincides with the standard angle indication of the device, that is, the angle of the liquid crystal polymer film is adjusted to the target angle.

[0065] In other words, the identification component determines the angle of the liquid crystal polymer film through laser diffraction, and then the angle of the liquid crystal polymer film is calibrated by the first stage 2, thereby achieving high-precision bonding of the liquid crystal polymer film on the target substrate.

[0066] Furthermore, the first stage 2 can move the substrate according to the position feedback of the image acquisition component 8, so that the position of the liquid crystal polymer film is moved to the target position. It can also rotate the substrate according to the angle feedback of the image acquisition component 8, so that the angle of the liquid crystal polymer film reaches the target angle.

[0067] The first stage 2 can move the substrate in the XY direction according to the position feedback of the camera 16, so that the position of the liquid crystal polymer film is moved to the target position. The first stage 2 can also rotate the substrate according to the angle feedback of the camera 16, so that the angle of the liquid crystal polymer film reaches the target angle, thereby ensuring that the position and angle of the liquid crystal polymer film can be adjusted to the corresponding target respectively. Of course, the first stage 2 can be a platform module, and as mentioned above, it has the functions of XY displacement and rotation around the Z direction.

[0068] Furthermore, such as Figure 6 As shown, the polarizing holographic grating liquid crystal polymer film transfer device provided in this embodiment of the invention further includes a first guide rail 9, a first driving component, and a second driving component;

[0069] like Figure 2 As shown, the first guide rail 9 is mounted on the stand 1 and is located below the identification component;

[0070] The first stage 2 and the second stage 7 are respectively slidably disposed on the first guide rail 9, and both can slide to the bottom of the recognition component;

[0071] The first drive assembly is disposed on the platform 1 and is used to drive the first platform 2 to slide along the first guide rail 9;

[0072] The second drive assembly is disposed on the platform 1 and is used to drive the second platform 7 to slide along the first guide rail 9.

[0073] It should be noted that, as Figure 2 As shown, the first guide rail 9 can be disposed on the stage 1 along a first direction and can be located below the recognition components (i.e., camera 16, laser 15); wherein, the first direction can be the length direction of the stage 1; the first stage 2 and the second stage 7 are respectively slidably disposed on the first guide rail 9, and both can slide to below the recognition components, so that the recognition components can respectively recognize the position and angle of the liquid crystal polymer film on the substrate on the first stage 2, and even recognize the position of the target substrate on the second stage 7; the first driving component is disposed on the stage 1 and is used to drive the first stage 2 to slide along the first guide rail 9, so that the first stage 2 automatically slides along the first guide rail 9 to below the recognition components; the second driving component is disposed on the stage 1 and is used to drive the second stage 7 to slide along the first guide rail 9, so that the second stage 7 automatically slides along the first guide rail 9 to below the recognition components; wherein, as Figure 6 As shown, the first driving component can be a first linear motor component 25, and the second driving component can be a second linear motor component 26, thereby ensuring that the first stage 2 and the second stage 7 slide smoothly and reliably. Of course, the first linear motor component 25 can also drive the first stage 2 to slide below the transfer component, and the second linear motor component 26 can also drive the second stage 7 to slide close to the transfer component, thereby facilitating the transfer component to transfer and bond the liquid crystal polymer film on the substrate to the target substrate.

[0074] In this plan, such as Figure 2 , Figure 3 and Figure 4 As shown, the transfer assembly can be mounted on the stage 1 and located above the first guide rail 9, and can slide along the length of the first guide rail 9. The transfer assembly can also move up and down. After the position and angle of the liquid crystal polymer film on the substrate are adjusted to the corresponding target, the first linear motor assembly 25 can drive the first stage 2 to slide below the transfer assembly. The transfer assembly moves down to pick up and peel off the liquid crystal polymer film on the substrate, then moves up with the liquid crystal polymer film and moves it above the second stage 7. Then it moves down with the liquid crystal polymer film and sticks it to the target substrate, thereby transferring the liquid crystal polymer film on the substrate to the target substrate. Of course, the transfer assembly of this solution is designed in this way to facilitate the transfer of the liquid crystal polymer film on the substrate to the target substrate.

[0075] Specifically, such as Figure 7As shown, the transfer assembly includes a transfer component for rolling and adhering a liquid crystal polymer film on a substrate, and for rolling and unfolding the liquid crystal polymer film and adhering it to the target substrate. Specifically, when the transfer component moves above the first stage 2, or when the first stage 2 moves below the transfer component, the transfer component can move downwards and roll and adher the liquid crystal polymer film on the substrate, then transfer and roll it to the target substrate. This method of transferring the liquid crystal polymer film from the substrate offers advantages such as convenient, reliable, and precise transfer.

[0076] Furthermore, such as Figure 5 As shown, the transfer assembly includes: a support 10, a movable body 5, and a transfer roller 4;

[0077] like Figure 2 As shown, the movable body 5 is mounted on the platform 1 via the bracket 10, and its movable end can move back and forth and up and down on the first platform 2 and the second platform 7.

[0078] The transfer roller 4 is disposed at the movable end of the moving body 5 and is used to roll up and roll out the liquid crystal polymer film; wherein, the adhesive force of the transfer roller 4 is greater than the adhesive force of the liquid crystal polymer film on the substrate, but less than the adhesive force on the target substrate.

[0079] It should be noted that, as Figure 2 and Figure 3 As shown, the movable body 5 can be mounted on the platform 1 via the bracket 10 and positioned above the first guide rail 9. Its movable end can move back and forth and up and down along the length of the first guide rail 9 on the first platform 2 and the second platform 7. Specifically, as... Figure 7As shown, the moving body 5 may include: a second guide rail 6, a carriage 21, a third drive assembly, a lifting assembly 24, a pressure regulating assembly 20, a rotating assembly 23, and a fixed frame; the support 10 is mounted on the platform 1; the second guide rail 6 (which may be a double rail) is mounted on the support 10, located above the first guide rail 9, and parallel to the first guide rail 9; the carriage 21 is mounted on the second guide rail 6 and can slide along the second guide rail 6; the third drive assembly may be a third linear motor assembly 27, which can be mounted on the platform 1 and used to drive the carriage 21 to slide along the second guide rail 6; the lifting assembly 24 is mounted on the carriage 21; the pressure regulating assembly 20 may include: a cylinder and a connecting block 11, the cylinder is vertically mounted on the movable end of the lifting assembly 24, and its movable end is downward, the fixed frame is mounted on the movable end of the cylinder through the connecting block 11. The transfer roller 4 is rotatably mounted on the fixed frame. The rotating assembly 23 is located on one side of the fixed frame and is used to drive the transfer roller 4 to rotate. The third linear motor assembly 27 drives the slide 21 to slide along the length of the first guide rail 9, thereby driving the transfer roller 4 to move back and forth on the first stage 2 and the second stage 7 to transfer the liquid crystal polymer film. The lifting assembly 24 drives the transfer roller 4 to move up and down. The rotating assembly drives the transfer roller 4 to rotate, so that the transfer roller 4 rolls to stick up and rolls to unfold the liquid crystal polymer film. The pressure adjusting assembly 20 adjusts the pressure of the transfer roller 4 to ensure that the transfer roller 4 sticks the liquid crystal polymer film on the substrate with appropriate pressure and adheres the liquid crystal polymer film to the target substrate with appropriate pressure, so as to avoid damaging the substrate and the target substrate.

[0080] In addition, the adhesive force of the transfer roller 4 is greater than that of the liquid crystal polymer film on the substrate, so that the transfer roller 4 can roll and stick the liquid crystal polymer film on the substrate. The adhesive force of the transfer roller 4 is less than that of the target substrate, so that the liquid crystal polymer film can be stuck to the target substrate. Of course, the transfer roller 4 has a certain initial adhesive force, and its material can be silicone or acrylic or other adhesive materials to prevent the transfer roller 4 from damaging the liquid crystal polymer film on the substrate.

[0081] During the transfer of the liquid crystal polymer film, the substrate is placed on the first stage 2, and the target substrate is placed on the second stage 7. The camera 16 captures the position of the liquid crystal polymer film and adjusts it by moving it in the x and y directions through the first stage 2 to bring the liquid crystal polymer film to the target position. In addition, the laser 15 shines light on the liquid crystal polymer film, and the camera 16 determines the grating angle by capturing the diffracted light. Then, the information is transmitted to the first stage 2 for rotation adjustment to bring the angle of the liquid crystal polymer film to the target angle. After the adjustment, the transfer roller 4 picks up the liquid crystal polymer film and then transfers and sticks it to the target substrate. Of course, the roller 4 has a certain initial adhesive force.

[0082] Furthermore, such as Figure 5 As shown, the transfer roller 4 is located above the substrate and the target substrate, and its axis is parallel to the substrate and the target substrate, respectively. The axis of the transfer roller 4 is perpendicular to the first guide rail 9 or the second guide rail 6; this design facilitates the rolling of the transfer roller 4 to adhere to and roll out the liquid crystal polymer film.

[0083] Furthermore, this invention also provides a method for fabricating a polarizing holographic grating, which is performed using the polarizing holographic grating liquid crystal polymer thin film transfer device described above. The method includes:

[0084] S1. Prepare a liquid crystal polymer film on a substrate and place the substrate with the liquid crystal polymer film on a first stage;

[0085] S2. Place the target substrate on the second stage;

[0086] S3. The orientation of the liquid crystal polymer film on the substrate is identified by the recognition component and fed back to the first stage. The first stage then moves the substrate according to the feedback, so that the orientation of the liquid crystal polymer film is adjusted to the target orientation.

[0087] S4. Use a transfer assembly to peel off the liquid crystal polymer film from the substrate and transfer the liquid crystal polymer film to the target substrate; wherein, the target substrate is coated with an adhesive layer;

[0088] S5. Apply an adhesive layer to the liquid crystal polymer film, and repeat steps S1, S3 and S4.

[0089] S6. Repeat step S5 until the fabrication of the polarizing holographic grating is complete.

[0090] It should be noted that in step S1, as described above, an existing process can be used to prepare a liquid crystal polymer film on the substrate, and the substrate with the liquid crystal polymer film is placed on the first stage; wherein, the substrate can be adsorbed through the first vacuum hole on the first stage; in step S2, after the target substrate is placed on the second stage, the target substrate can be adsorbed through the second vacuum hole on the second stage; in step S3, the first stage can be moved below the camera 16 by the first linear motor assembly, and the camera 16 identifies the position of the liquid crystal polymer film on the substrate and reverses the position. The liquid crystal polymer film is fed to the first stage, which then moves the substrate to translate, thus moving the liquid crystal polymer film to the target position. The laser 15 and camera 16 work together to identify the angle of the liquid crystal polymer film, and this angle is fed back to the first stage. The first stage then rotates the substrate to rotate the liquid crystal polymer film to the target angle. In step S4, after the position and angle of the liquid crystal polymer film are adjusted to the corresponding target, the first linear motor assembly moves the first stage to below the transfer roller 4. The lifting assembly then moves the transfer roller 4 down to adhere the substrate. A liquid crystal polymer film is transferred and adhered to an adhesive layer on a target substrate using a lifting assembly and a third linear motor assembly. The target substrate is coated with an adhesive layer. In step S5, after the liquid crystal polymer film is transferred and adhered to the adhesive layer on the target substrate, another adhesive layer is applied to the liquid crystal polymer film. Steps S1, S3, and S4 are then repeated to superimpose another layer of liquid crystal polymer film onto the target substrate. In step S6, step S5 is repeated, that is, other liquid crystal polymer films are sequentially adhered to the target substrate. The process continues until the polarizing holographic grating is fabricated. The resulting polarizing holographic grating comprises a target substrate (target lens) and multiple alternating layers of adhesive and liquid crystal polymer films, but no alignment layer. Since this method utilizes the aforementioned polarizing holographic grating liquid crystal polymer film transfer device, it offers corresponding advantages, as detailed above. Alternatively, the substrate can be enlarged, and multiple liquid crystal polymer films can be fabricated on this substrate, eliminating the need to replace the substrate during the fabrication of the polarizing holographic grating.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polarization volume holographic grating liquid crystal polymer film transfer device, characterized in that, The utility model relates to a kind of liquid crystal polymer film transfer device, including: Rack (1), first stage (2), second stage (7), identification component and transfer component; The first stage (2) is arranged in the rack (1), and is used to place substrate with liquid crystal polymer film;Wherein, the first stage (2) can drive the substrate to be active; The second stage (7) is arranged in the rack (1), and is used to place target substrate; The identification component is used to identify the attitude of liquid crystal polymer film on the substrate, and the first stage (2) can drive the substrate to be active according to the feedback of the identification component, so that the attitude of the liquid crystal polymer film is adjusted to target attitude; The transfer component is used to peel off the liquid crystal polymer film on the substrate after the liquid crystal polymer film is adjusted to target attitude, and then transfer and stick the liquid crystal polymer film on the target substrate.

2. The polarization volume holographic grating liquid crystal polymer film transfer device according to claim 1, wherein, The identification component is used to identify the position and angle of liquid crystal polymer film on the substrate respectively, and the first stage (2) can drive the substrate to be active according to the position feedback of the identification component, so that the position of the liquid crystal polymer film is adjusted to target position, and can drive the substrate to be active according to the angle feedback of the identification component, so that the angle of the liquid crystal polymer film is adjusted to target angle.

3. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 2, wherein, The identification component includes image acquisition component (8) and illumination component; The image acquisition component (8) is used to identify the position of liquid crystal polymer film on the substrate; The illumination component is used to irradiate the liquid crystal polymer film on the substrate, and make the liquid crystal polymer film produce several diffraction light rays in specific direction, and the image acquisition component (8) is also used to collect the direction of several diffraction light rays of the liquid crystal polymer film, and determine the angle of the liquid crystal polymer film.

4. The polarization volume holographic grating liquid crystal polymer film transfer device according to claim 3, wherein, The first stage (2) can drive the substrate to move according to the position feedback of the image acquisition component (8), so that the position of the liquid crystal polymer film is moved to target position, and can drive the substrate to rotate according to the angle feedback of the image acquisition component (8), so that the angle of the liquid crystal polymer film reaches target angle.

5. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 1, wherein, It also includes first guide rail (9), first drive component and second drive component; The first guide rail (9) is arranged in the rack (1), and is located below the identification component; The first stage (2) and the second stage (7) are respectively slidably arranged in the first guide rail (9), and can be slid to below the identification component; The first drive component is arranged in the rack (1), and is used to drive the first stage (2) to slide along the first guide rail (9); The second drive component is arranged in the rack (1), and is used to drive the second stage (7) to slide along the first guide rail (9).

6. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 5, wherein, The transfer component is arranged in the rack (1), and is located above the first guide rail (9) and can slide along the length direction of the first guide rail (9).

7. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 1, wherein, The transfer component includes transfer component, and is used to roll up the liquid crystal polymer film on the substrate, and roll out and stick the liquid crystal polymer film on the target substrate.

8. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 7, wherein, The transfer assembly comprises a support (10), a moving body (5) and a transfer roller (4); The moving body (5) is arranged on the stage (1) through the support (10), and the movable end thereof can move back and forth and up and down on the first object table (2) and the second object table (7); The transfer roller (4) is arranged on the movable end of the moving body (5) and is used for rolling up and rolling out the liquid crystal polymer film; wherein the adhesion of the transfer roller (4) is greater than the adhesion of the liquid crystal polymer film on the substrate and is less than the adhesion on the target substrate.

9. The polarization volume holographic grating liquid crystal polymer film transfer device of claim 8, wherein, The transfer roller (4) is located above the substrate and the target substrate, and the axial direction thereof is parallel to the substrate and the target substrate, respectively.

10. A method for fabricating a polarizing holographic grating, characterized in that, The preparation is carried out by using the polarization volume holographic grating liquid crystal polymer film transfer device according to any one of claims 1-9, and the method comprises: S1, preparing a liquid crystal polymer film on a substrate, and placing the substrate with the liquid crystal polymer film on the first object table; S2, placing a target substrate on the second object table; S3, identifying the posture of the liquid crystal polymer film on the substrate by using the identification assembly, and feeding back to the first object table, so that the first object table drives the substrate to move according to the feedback, and the posture of the liquid crystal polymer film is adjusted to a target posture; S4, peeling off the liquid crystal polymer film on the substrate by using the transfer assembly, and transferring the liquid crystal polymer film to the target substrate; wherein the target substrate is coated with a glue layer; S5, coating a glue layer on the liquid crystal polymer film, and repeating steps S1, S3 and S4; S6, repeating step S5 until the preparation of the polarization volume holographic grating is completed.

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