Polarizing diffuser and polarizing display device

Abstract

The application provides a polarized diffuser and a polarized display device. The polarized diffuser comprises a substrate layer, and a microlens layer arranged on at least one side surface of the substrate layer, wherein the side of the microlens layer away from the substrate layer comprises a plurality of free-form surfaces arranged in an array, each free-form surface has a first direction central axis and a second direction central axis parallel to each other, the directions of the first direction central axis and the second direction central axis are the same as the height direction of the microlens layer, and each free-form surface is asymmetrically arranged along at least one of the first direction central axis and the second direction central axis to obtain an asymmetric light field. The application solves the problem that the light diffuser in the prior art is difficult to realize an asymmetric light field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D imaging, in particular to a polarized diffuser and a polarized display device. BACKGROUND

[0002] At present, the mainstream way of realizing 3D imaging in the industry includes binocular, structured light and TOF, wherein the binocular has low precision, the structured light has complex structure and high cost, and the TOF has sufficient precision and low cost, and has a popular trend of popularization. The TOF is usually composed of a transmitting end and a receiving end, wherein the transmitting end is mainly composed of a vcsel light source and a diffuser.

[0003] The light diffuser plays a role in shaping the light beam, and the light diffuser adopted in the prior art generally realizes axisymmetric or central symmetric light field, but in some scenes, it is necessary to realize asymmetric light field, such as the transmitting end of a sweeping machine or the transmitting end of a near-ground detection product, or in some application scenarios where detection is not performed in certain directions. In this case, it is not necessary to have high light intensity in a certain direction, and too high light intensity will cause exposure phenomenon, at which time the design of asymmetric light field is required.

[0004] That is, the light diffuser in the prior art has the problem of being difficult to realize asymmetric light field. SUMMARY

[0005] The main purpose of the present application is to provide a polarized diffuser and a polarized display device to solve the problem that the light diffuser in the prior art is difficult to realize asymmetric light field.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a polarized diffuser is provided, comprising: a substrate layer; a microlens layer, at least one side surface of the substrate layer is provided with the microlens layer, and the side of the microlens layer away from the substrate layer comprises a plurality of free curved surfaces, the plurality of free curved surfaces are arranged in an array, each free curved surface has a first direction central axis and a second direction central axis which are parallel to each other, the directions of the first direction central axis and the second direction central axis are the same as the height direction of the microlens layer, and each free curved surface is asymmetrically arranged along at least one of the first direction central axis and the second direction central axis to obtain an asymmetric light field.

[0007] Further, the slope of the free curved surface is proportional to the angle of the light ray incident on the free curved surface; and / or the area of each free curved surface is proportional to the energy value of the corresponding target asymmetric light field.

[0008] Further, the side of the microlens layer away from the substrate layer further comprises a transition surface, the adjacent two free curved surfaces in the plurality of free curved surfaces are smoothly transitioned through the transition surface, and the transition surface is a curved surface, so that the slope of the connection position between the adjacent two free curved surfaces is continuous.

[0009] Further, the slope of the surface type of the free-form surface corresponds to the angle of the illumination distribution of the target asymmetric light field, and the area size of the slope of the surface type of the free-form surface is proportional to the angular energy of the illumination distribution of the target asymmetric light field.

[0010] Further, the generation process of the lens with the free-form surface includes the following steps: S1, obtaining a target light field distribution; S2, calculating the slope of the surface type of the free-form surface corresponding to each angle of the target light field; S3, calculating the coordinate point position of the free-form surface corresponding to each angle of the target light field; S4, establishing the corresponding relationship between the slope of the surface type of the free-form surface and the coordinate point of the slope; and S5, three-dimensionally modeling the free-form surface to obtain the lens with the free-form surface.

[0011] Further, the surface type of the transition surface is formed by superimposing the free-form surface and the row change surface type of the free-form surface, and the row change surface type of the free-form surface is obtained by mirroring and translating each row of data of the free-form surface.

[0012] Further, the free-form surface is a convex structure or a concave structure, and the projection of the convex center or the concave center of the free-form surface on the base layer does not coincide with the projection of the center position of the free-form surface on the base layer.

[0013] Further, each free-form surface is symmetrically arranged along a first direction central axis, and each free-form surface is asymmetrically arranged along a second direction central axis; or each free-form surface is asymmetrically arranged along the first direction central axis, and each free-form surface is symmetrically arranged along the second direction central axis; or each free-form surface is asymmetrically arranged along the first direction central axis, and each free-form surface is asymmetrically arranged along the second direction central axis.

[0014] Further, the surface of the microlens layer away from the base layer is an entrance surface, and the entrance surface is formed by splicing a plurality of free-form surfaces and a plurality of transition surfaces to form a wave-shaped entrance surface.

[0015] Further, the shapes of the plurality of free-form surfaces in the entrance surface are the same, and the shapes of the plurality of transition surfaces in the entrance surface are the same.

[0016] According to another aspect of the present application, a polarized display device is provided, comprising: a Vcsel light source for providing a light beam with a divergence angle of 15°-30°; the polarized diffuser described above, the Vcsel light source being spaced apart from the polarized diffuser, and the Vcsel light source emitting a light beam to the polarized diffuser.

[0017] The technical scheme of the present application is applied to the polarized diffuser, which comprises a substrate layer and a microlens layer, at least one side surface of the substrate layer is provided with the microlens layer, the side of the microlens layer away from the substrate layer comprises a plurality of free-form surfaces, the plurality of free-form surfaces are arranged in an array, each free-form surface has a first direction central axis and a second direction central axis which are parallel to each other, the directions of the first direction central axis and the second direction central axis are the same as the height direction of the microlens layer, and each free-form surface is asymmetrically arranged along at least one of the first direction central axis and the second direction central axis, so as to obtain an asymmetric light field.

[0018] The plurality of free-form surfaces are arranged in an array, each free-form surface has a first direction central axis and a second direction central axis which are parallel to each other, the directions of the first direction central axis and the second direction central axis are the same as the height direction of the microlens layer, and each free-form surface is asymmetrically arranged along at least one of the first direction central axis and the second direction central axis, so as to obtain an asymmetric light field. Due to the symmetry of the free-form surface determining the symmetry of the target light field, it is necessary to ensure that the asymmetry of the free-form surface is consistent with the symmetry of the target asymmetric light field, so that the shape of the free-form surface is highly matched with the target asymmetric light field, which is beneficial to the application of the polarized diffuser in special scenes, meets the demand of not detecting in one direction or not needing high light intensity in one direction, and is beneficial to the application of the polarized diffuser in more polarized products, expands the application range, and at the same time avoids the waste of light energy and improves the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A light field distribution diagram of the light diffuser in the prior art is shown;

[0021] Figure 2 A light field distribution diagram of the light diffuser in the prior art is shown; Figure 1 A light field distribution diagram of the light diffuser in the prior art is shown;

[0022] Figure 3 A light field distribution diagram of the light diffuser in the prior art is shown; Figure 1 A light field distribution diagram of the light diffuser in the prior art is shown;

[0023] Figure 4 A light field distribution diagram of the light diffuser in the prior art is shown; Figure 3 A light field distribution diagram of the light diffuser in the prior art is shown;

[0024] Figure 5 An application scene of the polarized diffuser of the embodiment one of the present application in uniaxial asymmetry is shown.

[0025] Figure 6 A light field distribution diagram of the polarized diffuser in Figure 5 is shown.

[0026] Figure 7 A light intensity distribution curve diagram of the polarized diffuser in Figure 5 is shown.

[0027] Figure 8 A free surface and light intensity distribution corresponding relationship diagram of the polarized diffuser in Figure 5 is shown.

[0028] Figure 9 A schematic diagram of a single free surface in Figure 5 is shown.

[0029] Figure 10 A diagram showing the change from the free surface to the transition surface in Figure 5 is shown.

[0030] Figure 11 A diagram showing the unit lens data obtained from the transition surface in embodiment one is shown.

[0031] Figure 12 A schematic diagram of the light entrance surface of the polarized diffuser in Figure 5 is shown.

[0032] Figure 13 An effect diagram of simulation using the polarized diffuser of embodiment one is shown.

[0033] Figure 14 A light intensity distribution curve diagram of simulation in Figure 13 is shown.

[0034] Figure 15 An application scenario of the polarized diffuser of embodiment two of the present application under biaxial asymmetry is shown.

[0035] Figure 16 A schematic diagram of the light entrance surface of the polarized diffuser of embodiment two of the present application is shown.

[0036] Figure 17 An effect diagram of simulation using the polarized diffuser of embodiment two is shown.

[0037] Figure 18 A light field distribution diagram of simulation in Figure 17 is shown.

[0038] Figure 19 A light intensity distribution curve diagram of simulation in Figure 17 is shown.

[0039] Figure 20A flow chart of generating the lens with free-form surface of the present application is shown.

[0040] In the drawings:

[0041] 10, substrate layer; 20, microlens layer; 21, light entrance surface; 211, free-form surface; 212, transition surface; 30, first direction central axis; 40, second direction central axis. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0043] It should be noted that all technical and scientific terms used in the present application have the same meaning as that generally understood by those skilled in the art to which the present application belongs, unless otherwise specified.

[0044] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0045] As shown in Figures 1 to 4 , it is a schematic diagram of the light diffuser in the prior art. Figure 1 The light field effect diagram and the light field distribution curve of the light diffuser in the prior art are shown. It can be seen from the light field effect diagram and the light field distribution curve that the light diffuser is axisymmetric in the horizontal axis direction and the vertical axis direction. The prior art realizes the axisymmetric light field distribution form of the horizontal axis and the vertical axis. As can be seen from the diagram, the light beams emitted by the light source are uniformly and symmetrically emitted through the light diffuser, and form an axisymmetric rectangular light spot on the receiver. Figure 3 It is a face type diagram of a single lens structure of the light diffuser in the prior art. It can be seen that the single lens face type for the axisymmetric light field distribution is in the form of horizontal axis and vertical axis symmetric distribution. Figure 4 It is an array structure formed after adopting the lens structure array in Figure 3 . It can be seen that the phenomenon of slope discontinuity occurs at the connection position of every two adjacent lenses, and the convergence point of the adjacent two lenses appears as a sharp corner structure, which is not conducive to processing.

[0046] In order to solve the problem that the light diffuser in the prior art is difficult to realize asymmetric light field, the present application provides a polar light diffuser and a polar light display device.

[0047] As shown in Figures 5 to 20As shown, the polarized diffuser comprises a substrate layer 10 and a microlens layer 20, at least one side surface of the substrate layer 10 is provided with the microlens layer 20, the side of the microlens layer 20 away from the substrate layer 10 comprises a plurality of free-form surfaces 211, the plurality of free-form surfaces 211 are arranged in an array, each free-form surface 211 has a first direction central axis 30 and a second direction central axis 40 which are parallel to each other, the directions of the first direction central axis 30 and the second direction central axis 40 are the same as the height direction of the microlens layer 20, and each free-form surface 211 is asymmetrically arranged along at least one of the first direction central axis 30 and the second direction central axis 40 to obtain an asymmetric light field.

[0048] The plurality of free-form surfaces 211 are arranged in an array, each free-form surface 211 has a first direction central axis 30 and a second direction central axis 40 which are parallel to each other, the directions of the first direction central axis 30 and the second direction central axis 40 are the same as the height direction of the microlens layer 20, and each free-form surface 211 is asymmetrically arranged along at least one of the first direction central axis 30 and the second direction central axis 40 to obtain an asymmetric light field. Due to the symmetry of the free-form surface 211 determines the symmetry of the target light field, it is necessary to ensure that the asymmetry of the free-form surface 211 is consistent with the symmetry of the target asymmetric light field, so that the shape of the free-form surface 211 is highly matched with the target asymmetric light field, which is conducive to the application of the polarized diffuser in special scenes, meets the needs of not detecting in one direction or not needing high light intensity in one direction, and further facilitates the application of the polarized diffuser in more polarized products, expands the application range, and at the same time avoids the waste of light energy and improves the energy utilization rate.

[0049] Specifically, the slope of the freeform surface 211 is proportional to the angle of the light incident on the freeform surface 211; the area of each freeform surface 211 is proportional to the energy value of the corresponding target asymmetric light field. Since the target light field is in an asymmetric form (single-axis asymmetric or double-axis asymmetric), the slope of the designed freeform surface 211 corresponds to the angle distribution of the target asymmetric light field, and the area ratio of the freeform surface 211 corresponds to the energy ratio of the target asymmetric light field. In a conventional design, due to the relatively small angle in the freeform surface 211, the slope of the surface type is small and the total energy is low, resulting in an asymmetric freeform surface 211, a step is formed in the small angle direction, and when the array is used with the freeform surface 211, there is a sharp corner structure at the connection position between the two adjacent freeform surfaces 211, which is not a smooth transition, and is not conducive to process processing. Therefore, for a non-axisymmetric light field, the freeform surface 211 needs to be designed. By adjusting the slope change of the freeform surface 211 and the area size of the freeform surface 211, the entire light entrance surface 21 formed after the array of multiple freeform surfaces 211 can realize the required asymmetric light field after the incident light beam is shaped.

[0050] The microlens layer 20 is composed of a plurality of unit lens arrays, the surface of each unit lens is the freeform surface 211 described above, and the unit lens data is calculated from the freeform surface 211. Since the light field distribution is determined by the slope and area distribution of the freeform surface 211, as long as the slope and area distribution of the freeform surface 211 is unchanged, the target light field is unchanged. By changing the freeform surface 211 using the slope distribution unchanged in the first direction and the second direction, the unit lens data is obtained.

[0051] Specifically, the side of the microlens layer 20 away from the substrate layer 10 further comprises a transition surface 212, and the transition surface 212 is used to smoothly transition between two adjacent free-form surfaces 211 in the plurality of free-form surfaces 211, and the transition surface 212 is a curved surface, so that the slope at the connection position between the two adjacent free-form surfaces 211 is continuous. By setting the transition surface 212, the transition surface 212 can make the connection position between the two adjacent free-form surfaces 211 not have a sharp corner structure, and the slope is continuous, so as to facilitate subsequent processing. The surface type of the transition surface 212 is obtained by superimposing the surface type of the free-form surface 211 and the row change surface type of the free-form surface 211, and the row change surface type of the free-form surface 211 is obtained by mirroring and then translating each row of data of the free-form surface 211. That is, the surface type of the transition surface 212 = the surface type of the free-form surface 211 + the row change surface type of the free-form surface 211; the row change surface type of the free-form surface 211 is obtained by mirroring and then translating each row of data of the free-form surface 211, and the surface type matrix changes from m*n of the free-form surface 211 to 2m*n. As can be seen from the figure, when the two points on the horizontal curve are equidistant from the connection axis and the slope is equal, the slope distribution of the free-form surface 211 + the row change surface type of the free-form surface 211 is unchanged, and the overall slope distribution is unchanged.

[0052] As shown in Figure 20 , the slope of the surface type of the free-form surface 211 corresponds to the angle of the illumination distribution of the target asymmetric light field, and the area size occupied by the slope of the surface type of the free-form surface 211 is proportional to the angle energy of the illumination distribution of the target asymmetric light field. And the generation process of the lens with the free-form surface 211 includes the following steps:

[0053] Step S1: obtaining a target light field distribution;

[0054] Step S2: calculating the surface type slope of the free-form surface 211 corresponding to each angle of the target light field;

[0055] Step S3: calculating the coordinate point position of the free-form surface 211 corresponding to each angle of the target light field;

[0056] Step S4: establishing a corresponding relationship between the surface type slope of the free-form surface 211 and the coordinate point of the slope;

[0057] Step S5: three-dimensional modeling of the free-form surface to obtain a lens with the free-form surface 211.

[0058] The generation steps of the lens with the free-form surface 211 described above are beneficial to ensure that the light deflection effect of the finally generated lens with the free-form surface 211 matches the required light field distribution, so as to obtain the required asymmetric or special-shaped target light field.

[0059] Specifically, the free-form surface 211 is a convex structure or a concave structure, the free-form surface 211 has a convex center or a concave center, and a projection of the convex center or the concave center of the free-form surface 211 on the base layer 10 does not coincide with a projection of a center position of the free-form surface 211 on the base layer 10. When the free-form surface 211 is a convex structure, the surface type generation process of the transition surface 212 is as follows: assuming that the base surface type of the free-form surface 211 is a data matrix m*n, first, the row data is processed, all the row data is mirror-inverted, and the first column data after the inversion is translated to be the same as the last column data of the base surface type, so as to connect the two groups of data in the horizontal direction and obtain a transition data array 2m*n. Then, the transition data is processed by column, each column of data is mirror-inverted, and the first row data after the inversion is translated to be the same as the last row data of the transition surface, so as to obtain a unit lens data 2m*2n. Since the relative position relationship of the changed data is the same as the base surface type, the slope distribution is unchanged, the target light field is unchanged, and the surface type slope continuity is good without sharp corners, which is beneficial to processing.

[0060] In an optional embodiment of the present application, each free-form surface 211 is symmetrically arranged along the first direction center axis 30, and each free-form surface 211 is asymmetrically arranged along the second direction center axis 40. In another optional embodiment of the present application, each free-form surface 211 is asymmetrically arranged along the first direction center axis 30, and each free-form surface 211 is symmetrically arranged along the second direction center axis 40. In another optional embodiment of the present application, each free-form surface 211 is asymmetrically arranged along the first direction center axis 30, and each free-form surface 211 is asymmetrically arranged along the second direction center axis 40. The arrangement can be set according to the specific application scenario and the specific light intensity distribution requirement.

[0061] In addition, the side surface of the microlens layer 20 away from the base layer 10 is the light entrance surface 21, the light entrance surface 21 is spliced by the plurality of free-form surfaces 211 and the plurality of transition surfaces 212 to form a wave-shaped light entrance surface 21. The wave-shaped light entrance surface 21 does not have a sharp corner design, has good slope continuity, and is beneficial to process processing. The shapes of the plurality of free-form surfaces 211 in the light entrance surface 21 are the same, and the shapes of the plurality of transition surfaces 212 in the light entrance surface 21 are the same.

[0062] In addition, the hard glass or soft plastic material of the base layer 10 described above can be selected according to specific conditions to ensure the light transmittance and formability of the base layer 10.

[0063] The application further provides a polarized display device, comprising a Vcsel light source and the polarized diffuser, the Vcsel light source is used for providing a light beam with a divergence angle of 15°-30°; the Vcsel light source is arranged at intervals from the polarized diffuser, and the Vcsel light source emits a light beam to the polarized diffuser. The Vcsel light source is located at one side of the polarized diffuser with the light entrance surface 21. The polarized diffuser of the application can realize asymmetric light field distribution in any direction, and the light entrance surface 21 does not have sharp corner design, has good continuity, and is beneficial to process processing.

[0064] Embodiment one

[0065] As shown in Figures 5 to 14 , the polarized diffuser of embodiment one is described. In this embodiment, only one side of the substrate layer 10 is provided with the microlens layer 20.

[0066] As shown in Figure 5 , it is applied to the scene of single-axis asymmetric light field distribution, generally for near-ground detectors, such as floor sweeping robots walking on the ground, or wall detectors installed on the wall surface, and the light intensity in the near-ground or wall surface direction is required to be as small as possible, which is sufficient to detect the surface object. If the light intensity is too strong, the exposure phenomenon will occur, and the surface object signal reception will not be clear.

[0067] As shown in Figure 6 and Figure 7 , in this embodiment, each free-form surface 211 is asymmetrically arranged along the first direction central axis 30, and each free-form surface 211 is symmetrically arranged along the second direction central axis 40. The first direction central axis 30 is the horizontal direction, and the second direction central axis 40 is the vertical direction. Figure 6 and Figure 7 It can be seen that the light field distribution is single-axis asymmetric illumination light field distribution, and the left and right light fields are symmetrical, and the upper and lower angles are different in size. The upper angle is large and the energy is high, and the lower angle is small and the energy is low.

[0068] From Figure 8 , it can be seen that the shape of the free-form surface 211 is obtained according to the corresponding relationship between the target asymmetric light field requirement and the illumination distribution and the slope change of the free-form surface 211. It can be seen that the free-form surface 211 is a symmetrical structure along the second direction central axis 40 and is asymmetric along the first direction central axis 30. The three-dimensional diagram of the free-form surface 211 finally obtained is shown in Figure 9 .

[0069] As shown in Figure 10The diagram illustrates the process of changing the surface shape of the transition surface 212 obtained from the freeform surface 211. The surface shape of the transition surface is calculated as: Freeform surface 211 + the row-changing surface shape of freeform surface 211. The row-changing surface shape of freeform surface 211 is obtained by mirroring and then translating each row of data from freeform surface 211. The surface shape matrix changes from m*n in freeform surface 211 to 2m*n. As shown in the diagram, the slope of the curve in the horizontal x-direction is equal when the distances from the points on both sides to the connecting axis are equal, centered on the connecting axis. The surface shape trend remains unchanged in the vertical direction. Therefore, the slope distribution of freeform surface 211 + the row-changing surface shape of freeform surface 211 remains unchanged, and the overall slope distribution remains unchanged.

[0070] It should be noted here that the code for the row-changing surface data is (in MATLAB language), where Z represents the freeform surface (211) data, Z1 represents the row-changing surface data, and lens_Z represents the final surface shape:

[0071] Z1=[Z(1:round(size(Z,1) / 2),:); flipud(Z(1:round(size(Z,1) / 2)-1,:))];

[0072] Lens_Z = Z1 - min(Z1(:));

[0073] like Figure 11 As shown, this is the generation process of the unit lens at the position of the microlens layer 20 where the transition surface 212 is located. The transition surface + the column change surface shape of the transition surface = unit lens. The unit lens is obtained by mirroring, flipping and translating the data of each column of the transition surface. The surface shape matrix changes from 2m*n of the freeform surface 211 to 2m*2n. As can be seen from the figure, the curve in the vertical y direction has the same slope when the distance from the two points to the axis is equal, with the connecting axis as the center. The surface shape trend in the horizontal x direction remains unchanged, so the slope distribution of the two surface shapes remains unchanged, and the overall slope distribution remains unchanged.

[0074] like Figure 12 The figure shows a 3D schematic diagram of the light-incident surface 21, which is composed of an array of multiple free-form surfaces 211 and multiple transition surfaces 212. As can be seen from the figure, the light-incident surface 21 has no sharp corners and its slope is relatively continuous, which is more conducive to the processing and makes the processed product closer to the design result.

[0075] like Figure 13 and Figure 14 The figure shows the simulation results and illuminance distribution curve of the polarized display device in Embodiment 1. From the light field effect diagram and illuminance distribution curve, it can be seen that the freeform surface 211 and the light field distribution are symmetrically distributed along the central axis 40 of the second direction, and asymmetrically distributed along the central axis 30 of the first direction. The modified simulation results still meet the target requirements.

[0076] Example 2

[0077] As Figures 15 to 19 shown, the polarized diffuser of embodiment two is described. In this embodiment, only one side of the substrate layer 10 is provided with the microlens layer 20.

[0078] As Figure 15 shown, the polarized diffuser of embodiment two is described. In this embodiment, only one side of the substrate layer 10 is provided with the microlens layer 20.

[0079] As Figure 16 shown, the polarized diffuser of embodiment two is described. In this embodiment, only one side of the substrate layer 10 is provided with the microlens layer 20.

[0080] As Figures 17 to 19 shown, the polarized diffuser of embodiment two is described. In this embodiment, only one side of the substrate layer 10 is provided with the microlens layer 20.

[0081] Obviously, the above described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should belong to the scope of protection of the present application.

[0082] It is to be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0083] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0084] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A polarizing diffuser, characterized by, The polarized diffuser comprises: a substrate layer (10); a microlens layer (20) provided on at least one side surface of the substrate layer (10), the side of the microlens layer (20) away from the substrate layer (10) comprising a plurality of free-form surfaces (211), the plurality of free-form surfaces (211) being arranged in an array, each of the free-form surfaces (211) having a first direction central axis (30) and a second direction central axis (40) parallel to each other, the directions of the first direction central axis (30) and the second direction central axis (40) being the same as the height direction of the microlens layer (20), and each of the free-form surfaces (211) being asymmetrically arranged along at least one of the first direction central axis (30) and the second direction central axis (40) to obtain an asymmetric light field; a slope of the free-form surface (211) being proportional to the angle of a light ray incident on the free-form surface (211); a slope of a surface type of the free-form surface (211) corresponding to the angle of an illumination distribution of a target asymmetric light field, and an area size of the slope of the surface type of the free-form surface (211) being proportional to the angular energy of the illumination distribution of the target asymmetric light field.

2. The polarized diffuser according to claim 1, wherein an area of each of the free-form surfaces (211) is proportional to an energy value of a corresponding target asymmetric light field.

3. The polarizing diffuser of claim 1, wherein, The side of the microlens layer (20) away from the substrate layer (10) further comprises a transition surface (212), two adjacent free-form surfaces (211) in the plurality of free-form surfaces (211) being smoothly connected through the transition surface (212), and the transition surface (212) being a curved surface to make the slope of a connection position between the two adjacent free-form surfaces (211) continuous.

4. The polarizing diffuser of claim 1, wherein, A generation process of the lens with the free-form surface (211) comprises: Step S1: obtaining a target light field distribution; Step S2: calculating a surface type slope of the free-form surface (211) corresponding to each angle of the target light field; Step S3: calculating a coordinate point position of the free-form surface (211) corresponding to each angle of the target light field; Step S4: establishing a corresponding relationship between the surface type slope of the free-form surface (211) and the coordinate point of the slope; Step S5: performing three-dimensional modeling on the free-form surface (211) to obtain the lens with the free-form surface (211).

5. The polarizing diffuser of claim 3, wherein, The surface type of the transition surface (212) is formed by superimposing a row change surface type of the free-form surface (211) and the free-form surface (211), and the row change surface type of the free-form surface (211) is obtained by mirror flipping and then translating each row of data of the free-form surface (211).

6. The polarizing diffuser of claim 1, wherein, The free-form surface (211) is a convex structure or a concave structure, and a projection of a convex center or a concave center of the free-form surface (211) on the substrate layer (10) does not coincide with a projection of a center position of the free-form surface (211) on the substrate layer (10).

7. The polarized diffuser according to claim 1, wherein Each of the free-form surfaces (211) is symmetrically arranged along the first direction central axis (30), and each of the free-form surfaces (211) is asymmetrically arranged along the second direction central axis (40); or Each of the free-form surfaces (211) is asymmetrically arranged along the first direction central axis (30), and each of the free-form surfaces (211) is symmetrically arranged along the second direction central axis (40); or Each of the free-form surfaces (211) is asymmetrically arranged along the first direction central axis (30), and each of the free-form surfaces (211) is asymmetrically arranged along the second direction central axis (40).

8. The polarizing diffuser of claim 3, wherein, The side surface of the microlens layer (20) away from the substrate layer (10) is an incident light surface (21), and the incident light surface (21) is formed by splicing a plurality of free-form surfaces (211) and a plurality of transition surfaces (212) to form a wave-shaped incident light surface (21).

9. The polarizing diffuser of claim 8, wherein, The shapes of the plurality of free-form surfaces (211) in the incident light surface (21) are the same, and the shapes of the plurality of transition surfaces (212) in the incident light surface (21) are the same.

10. A polarizing display device, characterized by comprising: Comprising: A Vcsel light source for providing a light beam with a divergence angle of 15°-30°; The polarized diffuser of any one of claims 1 to 9, the Vcsel light source is spaced apart from the polarized diffuser, and the Vcsel light source emits a light beam to the polarized diffuser.

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