CN111338012A

CN111338012A - Diffusion film and imaging assembly

Info

Publication number: CN111338012A
Application number: CN201811548267.9A
Authority: CN
Inventors: 孙云刚; 焉逢运
Original assignee: Silead Inc
Current assignee: Silead Inc
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-06-26
Anticipated expiration: 2038-12-18
Also published as: CN111338012B

Abstract

The application discloses diffusion barrier and imaging assembly, the diffusion barrier includes: a body; the body has first and second opposite surfaces; the first surface includes a first diffusion region having diffusion particles and a first vacant region having no diffusion particles; the second surface includes a second diffusion region having diffusion particles and a second vacant region having no diffusion particles. The diffusion barrier and the imaging assembly provided by the application can have the characteristic that light rays become uniform and can be used for imaging.

Description

Diffusion film and imaging assembly

Technical Field

The application relates to the technical field of liquid crystal display, in particular to a diffusion film and an imaging assembly.

Background

The diffusion film used at present is a smooth surface with one surface being the diffusion particles in disordered arrangement and the other surface being the non-diffusion particles, and the light can be effectively changed into disordered light by utilizing the single-side diffusion particles in disordered arrangement, so that the light becomes uniform. However, this cannot be imaged through a diffusion film, and thus cannot be applied to a scene required for imaging.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present application to provide a diffusion film and an imaging assembly that can both have characteristics of making light uniform and be used for imaging.

In order to achieve the purpose, the technical scheme is as follows:

a diffusion membrane comprising:

a body; the body has first and second opposite surfaces; the first surface includes a first diffusion region having diffusion particles and a first vacant region having no diffusion particles; the second surface includes a second diffusion region having diffusion particles and a second vacant region having no diffusion particles.

As a preferred embodiment, the diffusion membrane is configured to: the light source device comprises a diffusion film, a first vacant area, a second vacant area, a first diffusion area, a second diffusion area, a first diffusion area, a second vacant area and a light source, wherein the diffusion film is arranged on the substrate, the first vacant area is arranged on the substrate, the second vacant area is arranged on the substrate, the diffusion film is arranged on the substrate, the first vacant area is arranged on the substrate, the.

As a preferred embodiment, the first angle is 90 degrees; the second angle is greater than 0 degrees and less than 90 degrees.

In a preferred embodiment, the first diffusion region and the second diffusion region are at least partially offset in a direction perpendicular to the diffusion film.

As a preferred embodiment, the first diffusion region and the second diffusion region at least partially overlap in a direction perpendicular to the diffusion film.

In a preferred embodiment, the first vacant regions and the second vacant regions do not overlap in a direction perpendicular to the diffusion film.

As a preferred embodiment, the first diffusion region and the second vacant region are aligned in a direction perpendicular to the body; the second diffusion region and the first vacant region are aligned in a direction perpendicular to the body.

As a preferred embodiment, the first diffusion region and the second vacant region have the same shape; the second diffusion region and the first dummy region have the same shape.

As a preferred embodiment, the first and second vacant regions can form a transmission path through which light rays inclined with respect to the diffusion film pass.

As a preferred embodiment, the ratio of the total area of the first diffusion region and the second diffusion region to the area of the first surface or the second surface is 0.8 to 1.2.

As a preferred embodiment, the first surface comprises a plurality of parallel arranged diffusion strips; each diffusion zone having a plurality of said first diffusion regions and a plurality of said first vacant regions along a length direction thereof; in each diffusion zone, the first diffusion region and the first vacant region are spaced apart.

In a preferred embodiment, the first diffusion region and the first vacant region in two adjacent diffusion strips are shifted from each other in a direction perpendicular to the longitudinal direction of the diffusion strips.

An imaging assembly, comprising:

the diffusion membrane of any of the above embodiments;

the light source is positioned on one side of the second surface; the light source is used for emitting incident light to the diffusion film.

In a preferred embodiment, the side of the diffusion film where the first surface is located is the side where the object to be imaged is located; when the incident light emitted by the light source and the diffusion film are incident at a second angle, the light reflected by the imaged object forms an image on the side where the light source is located.

Has the advantages that:

the diffusion barrier that this application provided is through setting up first diffusion zone and second diffusion zone respectively at the first surface and the second surface of body for can diffuse incident light and send even scattered light, and, through set up first vacant region and second vacant region respectively on first surface and second surface, make the light source can pierce through this diffusion barrier at the invisible light that specific angle sent and do not pass through the diffusion, thereby be convenient for form images.

In addition, the diffusion barrier that this application provided can realize fingerprint identification under the screen when being applied to the fingerprint identification subassembly, has the even light-emitting that can guarantee the screen display simultaneously, guarantees that the user uses experience.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of a diffusion membrane provided in one embodiment of the present application;

FIG. 2 is a schematic diagram of FIG. 1 illustrating a state of forming uniformly scattered light;

FIG. 3 is a schematic view of a first surface of FIG. 1;

FIG. 4 is a schematic view of a second surface of FIG. 1;

FIG. 5 is a schematic view of the imaging of FIG. 1;

FIG. 6 is a schematic view of a diffusion membrane provided in another embodiment of the present application;

FIG. 7 is a schematic view of a diffusion membrane provided in another embodiment of the present application;

fig. 8 is a schematic view of a first surface provided in another embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The diffusion film is applied to, but not limited to, LCD display screens. In particular, the diffusion film can be applied to LCD backlight, so that light emitted by the backlight becomes uniform, and further, the brightness uniformity of a display screen is improved. The diffusion membrane of the embodiment of the invention can be applied or configured in a fingerprint identification component, and can be used in scenes including but not limited to under-screen fingerprint unlocking, authority acquisition, identity authentication and the like.

Please refer to fig. 1 to 5. Provided in an embodiment of the present application is a diffusion membrane, including: a body 100. The body 100 has first and second opposing

surfaces

101 and 102. The first surface 101 includes a first diffusion region 20 having diffusion particles 103 and a first vacant region 10 having no diffusion particles 103. The second surface 102 includes a second diffusion region 30 having diffusion particles 103 and a second void region 40 having no diffusion particles 103.

The diffusion film provided by the present application enables incident light to be diffused to emit uniformly scattered light by providing the first diffusion region 20 and the second diffusion region 30 on the first surface 101 and the second surface 102 of the body 100, respectively, and enables invisible light emitted from the light source 50 at a specific angle to penetrate the diffusion film without diffusion by providing the first vacant region 10 and the second vacant region 40 on the first surface 101 and the second surface 102, respectively, thereby facilitating imaging.

It should be noted that the perpendicular to the diffusion film described in the embodiments of the present application can also be understood to be perpendicular to the body 100, and correspondingly, can also be understood to be perpendicular to the first surface 101 or the second surface 102. Accordingly, incident light rays obliquely enter the diffusion film, which is distinguished from the vertically incident diffusion film. For the sake of understanding, in the embodiment of the present application, the light to be diffused by the diffusion film to form uniformly diffused light is referred to as a first light 55, and the light to be imaged is referred to as a second light 56.

By providing the first vacant regions 10 and the second vacant regions 40, when an incident light beam is incident at a predetermined angle, part of the incident light beam is incident through the first vacant regions 10 and exits through the second vacant regions 40. The part of the incident light is emitted without diffusion, so that the propagation direction of the light can be kept, and the imaging device can be used for imaging. Specifically, the diffusion film is provided as: and when the incident light and the diffusion film are incident at a first angle, the incident light is scattered to be uniformly emitted. When the incident light and the diffusion film are incident at a second angle, part of the incident light is incident through the first vacant region 10 and exits through the second vacant region 40.

The incident light at different angles can be provided by different light sources 50, and the incident light (the first light ray 55) emitted at the first angle can be the backlight light source 50, so that uniform light emission in backlight is realized, and visual experience is improved. Accordingly, the incident light (second light 56) emitted at the second angle may be the invisible light source 50, such as the infrared light source 50, the ultraviolet light source 50, etc., so that the light at different angles is not affected, and a better impression is still provided for the user, and the uniform light emitting characteristic of the diffusion film is not affected.

In the embodiment shown in fig. 2 and 6, the first angle is 90 degrees. The second angle is greater than 0 degrees and less than 90 degrees. The diffusion film uniformly diffuses incident light which is vertically incident, and light with uniform characteristics is output. When the imaging light source 50 is an infrared light source 50, the infrared light source 50 emits infrared light toward the substrate not in a direction perpendicular to the second surface 102 nor in a direction parallel to the second surface 102, but in a direction oblique to the substrate.

In the embodiment shown in fig. 7, the first light ray 55 is obliquely incident into the diffusion film and can be diffused by the first diffusion region 20 and the second diffusion region 30 to form uniformly diffused light. The second light ray 56 can be vertically incident into the diffusion film, and at least a portion of the second light ray 56 can directly pass through the first and second

vacant regions

10 and 40 without dispersion, so that the corresponding propagation direction can be maintained after the light ray is emitted. In this embodiment, the first angle is greater than 0 degrees and less than 90 degrees, and the second angle is 90 degrees.

For ease of manufacture and application, light at a specific angle is used for imaging, with first light ray 55 incident normally to the diffuser film and second light ray 56 incident obliquely to the diffuser film as the preferred embodiment of the present application.

In the embodiment, the body 100 may include a substrate, which may be an organic transparent material. The substrate may also be a light guide, a brightness enhancement film, etc., and the application is not limited solely thereto. In addition, the body 100 may have a multi-layer structure, or may have a single-layer structure in the drawing, and the present application is not limited thereto.

In addition, the body 100 is not limited to the single-layer structure as illustrated in fig. 1 to 7, but may be a multi-layer structure. When the body 100 has a multi-layer structure, it may have a plurality of surfaces, each of which may have a filling region 20 and an empty region, and the diffusion particles 103 are distributed in the filling region 20. Wherein any two of the plurality of surfaces may serve as the first surface 101 and the second surface 102, or the substrate of the multilayer structure may have a plurality of the first surface 101 and the second surface 102. Furthermore, the multiple layers of the substrate may be arranged at intervals or stacked.

In the embodiment of the present application, the surface of the body 100 is provided with the diffusion particles 103 to form a diffusion region. The diffusion particles 103 can diffuse light when the light passes through the diffusion region, so that uniform emergent light can be formed, and when the light is applied to a screen display, the brightness of the whole screen is uniform. Wherein the diffusion regions comprise a first diffusion region 20 on the first surface 101 and a second diffusion region 30 on the second surface 102. The diffusion particles 103 do not extend over the first surface 101 and the second surface 102. Since the diffusion particles 103 are not distributed over the entire surface of the first surface 101 and the second surface 102 of the substrate, the first surface 101 and the second surface 102 each have an empty region where the diffusion particles 103 are not distributed.

In the embodiment of the present application, the first diffusion region 20 and the second diffusion region 30 have the diffusion particles 103 arranged in a disordered manner, and the diffusion particles 103 may be organic or inorganic spheroidal particles. The incident light is scattered through the first diffusion region 20 and/or the second diffusion region 30, thereby emitting uniform light. The diffusion particles 103 of the first diffusion region 20 and the diffusion particles 103 of the second diffusion region 30 may be the same or different, and the present application is not particularly limited.

The areas of the first surface 101 and the second surface 102 of the body 100 where no diffusion particles 103 are provided form vacant areas. Wherein the vacant areas include first vacant area 10 on first surface 101 and second vacant area 40 on second surface 102. Specifically, in the case where a plurality of first diffusion regions 20, first dummy regions 10, second diffusion regions 30, and second dummy regions 40 are provided, the first dummy regions 10 may be formed between adjacent first diffusion regions 20, and the second dummy regions 40 may be formed between adjacent second diffusion regions 30.

In the present embodiment, the first and second

vacant regions

10 and 40 can form a transmission path through which light passes in a non-diffused manner. Preferably, the first vacant regions 10 and the second vacant regions 40 can form transmission paths through which light rays inclined with respect to the diffusion film pass.

When the incident light is incident at a predetermined angle (second angle), a part of the incident light passes through the diffusion film through the transmission path, and does not pass through the first diffusion region 20 and the second diffusion region 30, and accordingly, is not scattered. Thus, the incident light still has good propagation direction after passing through the diffusion film, and can be used for imaging.

Such as the embodiments shown in fig. 1-5. In order to improve the imaging quality and reduce the angle requirement of the light source 50 for the second light ray 56, the first diffusion region 20 and the second diffusion region 30 have no overlapping region along the direction perpendicular to the diffusion film. The first diffusion region 20 and the second diffusion region 30 are completely staggered in a direction perpendicular to the diffusion film.

In this embodiment, first diffusion region 20 and second diffusion region 30 may be complementary structures, with the projection of first diffusion region 20 on second surface 102 in matching registration with second vacant areas 40, and the projection of second diffusion region 30 on first surface 101 in matching registration with first vacant areas 10.

In the present embodiment, the projection of the first diffusion region 20 towards the second surface 102 is completely outside the extension of the second diffusion region 30. In this case, the first diffusion region 20 does not overlap the second diffusion region 30 at all (as in the embodiment illustrated in fig. 1 and 5). In particular, the shape of the projection of the first diffusion region 20 towards the second surface 102 is co-located or spaced apart from the shape of the second diffusion region 30.

In the embodiment of the present application, a ratio of a total area of the first diffusion region 20 and the second diffusion region 30 to an area of the first surface 101 or the second surface 102 is 0.8-1.2, so that a better uniform light emitting effect can be obtained. Preferably, the total area of the first diffusion region 20 and the second diffusion region 30 is not smaller than the area of the first surface 101 or the second surface 102. This enables the first diffusion region 20 and the second diffusion region 30 adjacent to each other to form a partially overlapped region, and the first light ray 55 incident perpendicularly can be effectively diffused to form uniformly diffused light.

As shown in fig. 1-6. In the present embodiment, the first diffusion region 20 and the second diffusion region 30 may be at least partially staggered. At this time, the first diffusion region 20 and the second diffusion region 30 do not at least partially overlap.

In the present embodiment, the first diffusion region 20 and the second diffusion region 30 are staggered in a direction perpendicular to the diffusion film. The projection of the first diffusion area 20 towards the second surface 102 (i.e. the vertical downward projection as illustrated in fig. 1) has at least a part of the projected area outside the extension of the second diffusion area 30. Accordingly, the projection of the second diffusion area 30 towards the first surface 101 (i.e. the vertically upward projection as illustrated in fig. 1) is at least partially outside the extent of the first diffusion area 20.

As shown in fig. 6. In one embodiment, to ensure uniform light emission and prevent a portion of the first light 55 from passing through the diffuser film without diffusion, the first diffusion region 20 and the second diffusion region 30 at least partially overlap in a direction perpendicular to the diffuser film. In this embodiment, the first light ray 55 having a vertical incidence has a better diffusion effect, resulting in a good uniform light emitting effect.

In the present embodiment, the projection of the first diffusion region 20 toward the second surface 102 has a part of the projection region located within the range of the second diffusion region 30, and a part located outside the range of the second diffusion region 30 (as in the embodiment illustrated in fig. 6). In this embodiment, the first diffusion region 20 does not partially overlap the second diffusion region 30. In particular, the area of the projection of the first diffusion area 20 towards the second surface 102 intersects the second diffusion area 30 at a position therebetween.

As shown in fig. 6. In one embodiment, to ensure uniform light emission and prevent a portion of the first light 55 from passing through the diffuser film without diffusion, the first vacant regions 10 and the second vacant regions 40 do not overlap in a direction perpendicular to the diffuser film. In this embodiment, the first light ray 55 having a vertical incidence has a better diffusion effect, resulting in a good uniform light emitting effect.

In the present embodiment, the projection of the first free area 10 towards the second surface 102, the whole projected area being located within the second diffusion area 30 (as in the embodiment illustrated in fig. 6). In this embodiment, the first vacant areas 10 and the second vacant areas 40 do not overlap with each other. In particular, the area of the projection of first free area 10 towards second surface 102 is spaced apart from the position of second free area 40.

In the present embodiment, the first diffusion region 20 and the second vacant region 40 are aligned in a direction perpendicular to the body 100. The second diffusion region 30 and the first vacant region 10 are aligned in a direction perpendicular to the body 100. The area of the first diffusion region 20 may be larger than the second vacant region 40. The projection of the second vacant areas 40 may be located within the range of the first diffusion area 20.

Such as the embodiments shown in fig. 1-5. The first diffusion region 20 and the second dummy region 40 may have the same shape. The second diffusion region 30 and the first dummy region 10 have the same shape. Accordingly, the first diffusion region 20 and the second diffusion region 30 may be complementary structures, both of which may be interspersed with the first surface 101 or the second surface 102.

As shown in fig. 3 and 4. In order to have a better uniform light emitting effect and a better imaging effect, the first surface 101 includes a plurality of diffusion strips 15 arranged in parallel. Each diffusion strip 15 has a plurality of said first diffusion areas 20 and a plurality of said first vacant areas 10 along its length direction F. In each diffusion strip 15, the first diffusion regions 20 and the first vacant regions 10 are spaced apart. There is a first vacant region 10b between each adjacent two

first diffusion regions

20a, 20 b. Accordingly, there is one first diffusion region 20a between each adjacent two first

vacant regions

10a and 10 b. In the present embodiment, the first dummy region 10 and the first diffusion region 20 are both square.

The distribution of the second surface 102 is similar to the first surface 101. Wherein the second surface 102 comprises a plurality of parallel arranged diffusion stripes 15. Each diffusion strip 15 has a plurality of said second diffusion regions 30 and a plurality of said second vacant regions 40 along its length. In each diffusion zone 15, the second diffusion regions 30 and the second vacant regions 40 are spaced apart. There is one second vacant region 40 between each adjacent two

second diffusion regions

30a, 30 b. Accordingly, there is one second diffusion region 30 between each adjacent two second

vacant regions

40a and 40 b. In the present embodiment, the second dummy region 40 and the second diffusion region 30 are both square.

The first diffusion region 20 is aligned with the second vacant region 40 in the direction perpendicular to the diffusion film, and both are the same shape. The second diffusion region 30 is aligned with the first vacant region 10 in a direction perpendicular to the diffusion film, and both are identical in shape. The first diffusion region 20 and the second diffusion region 30 are complementary structures, and have the same area as the first surface 101 or the second surface 102. Accordingly, first void region 10 and second void region 40 are also complementary structures, both having an area equal to the area of first surface 101 or second surface 102.

As shown in fig. 8. In a preferred embodiment, to achieve better imaging effect, the first diffusion regions 20 and the first vacant regions 10 in two adjacent diffusion strips 15a and 15b are staggered in a direction perpendicular to the length direction of the diffusion strips 15. The boundary between two adjacent regions in the diffusion band 15a is offset from and misaligned with the boundary between two adjacent regions in the diffusion band 15 b.

In this embodiment, the distribution of the second diffusion regions 30 and the second vacant regions 40 in the second surface 102 can be set with reference to the first surface 101, and will not be described herein again.

It should be noted that the first filling area 20 and the first vacant area 10 of the embodiment of the present application may have any suitable shape and be arranged on the first surface 101 in any feasible arrangement.

For example, as shown in FIG. 3, the first filled regions 20 and the first empty regions 10 may be square (e.g., square, rectangle), and the first filled regions 20 and the first empty regions 10 are regularly arranged in an array on the first surface 101.

Correspondingly, as shown in fig. 4, the second filled regions 30 and the second empty regions 40 may be square, and the second filled regions 30 and the second empty regions 40 are regularly arranged on the second surface 102 in an array manner. By arranging the filling areas 20 and the vacant areas in a square shape and in an array manner, the utilization rate of the surface of the substrate can be effectively improved.

Of course, the shape and arrangement of the filling region and the empty region are not limited to the above-described embodiments. In other possible embodiments, the filling areas and the empty areas may have other shapes, such as a circle, an ellipse, an irregular shape, etc., and the filling areas and the empty areas may also be arranged in a disordered irregular manner, as long as it is satisfied that the first filling area 20 and the second filling area 30 do not at least partially overlap, which is not limited in this embodiment of the present invention.

See fig. 7. In one possible embodiment, the first light ray 55 and the second light ray 56 may be provided by different light sources 0. The first light ray 55 is incident into the diffuser film at a 45 degree angle. The projection of the second diffusion area 30 on the first surface 101 and the first diffusion area 20 are full of the first surface 101 along the incident direction of the first light 55, so that all the first light 55 can be diffused to form uniformly scattered light before being emitted from the diffusion film. The light source emitting the first light 55 may be the visible light source 50, so as to provide a better uniform lighting effect for the user.

In this embodiment, the second light ray 56 is incident perpendicularly into the diffuser film. In the up-down direction (direction perpendicular to the diffusion film), the first vacant regions 10 and the second vacant regions 40 are at least partially overlapped (aligned), so that at least a part of the second light ray 56 is incident from the second vacant regions 40 and exits through the first vacant regions 10, and the part of the second light ray 56 is not diffused, so that the propagation direction can be maintained, and imaging can be facilitated.

Please continue to refer to fig. 1 to 8. An embodiment of the present application further provides an imaging assembly, including: a diffusion membrane as described in any one of the examples or embodiments above; a light source 50 located on the side of the second surface 102. Wherein the light source 50 is used for emitting incident light to the diffusion film. The light source 50 may be an invisible light source 50 for emitting imaging light.

In this embodiment, for the purpose of image formation, the side of the diffusion film where the first surface 101 is located is the side of the object to be imaged 60. When the incident light emitted from the light source 50 and the diffusion film are incident at a second angle, the light reflected by the imaged object 60 forms an image on the side where the light source 50 is located. In the case of fingerprint recognition, the imaged object 60 may be a finger, and the reflected light passes through the diffuser film to form the image 70 on the side of the second surface 102.

In fig. 5, the imaged object 60 "a" and the light source 50 are respectively located at two sides of the diffusion film, and the light reflected by the imaged object 60 "a" passes through the first and second vacant areas to form an image 70 "large a" at the side of the second surface 102. The side of the light source 50 may be provided with an imaging film or other structures for receiving the reflected light to perform imaging, and the application is not limited and illustrated.

In other embodiments, the light source 50 may be located on the same side of the diffuser film as the imaged object 60, and the application is not limited thereto.

The imaging component can be used for fingerprint identification, and the application of the optical fingerprint under the screen in an LCD display screen is possible.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims

1. A diffusion membrane, comprising:

2. The diffusion membrane of claim 1, wherein the diffusion membrane is configured to: the light source device comprises a diffusion film, a first vacant area, a second vacant area, a first diffusion area, a second diffusion area, a first diffusion area, a second vacant area and a light source, wherein the diffusion film is arranged on the substrate, the first vacant area is arranged on the substrate, the second vacant area is arranged on the substrate, the diffusion film is arranged on the substrate, the first vacant area is arranged on the substrate, the.

3. The diffusion membrane of claim 2, wherein the first angle is 90 degrees; the second angle is greater than 0 degrees and less than 90 degrees.

4. The diffuser film of any of claims 1-3, wherein the first diffuser region and the second diffuser region are at least partially offset in a direction perpendicular to the diffuser film.

5. The diffuser film of any of claims 1-3, wherein the first diffuser region and the second diffuser region at least partially overlap in a direction perpendicular to the diffuser film.

6. The diffuser film of claim 4, wherein the first and second void regions do not overlap in a direction perpendicular to the diffuser film.

7. The diffusion membrane of claim 1, wherein the first diffusion region and the second vacant region are aligned in a direction perpendicular to the body; the second diffusion region and the first vacant region are aligned in a direction perpendicular to the body.

8. The diffusion membrane of claim 7, wherein the first diffusion region and the second vacant region are the same shape; the second diffusion region and the first dummy region have the same shape.

9. The diffuser film of claim 1, wherein the first and second void regions are capable of forming a transmission path for light rays that are oblique relative to the diffuser film.

10. The diffusion membrane of claim 1, wherein the ratio of the total area of the first diffusion region and the second diffusion region to the area of the first surface or the second surface is 0.8 to 1.2.

11. The diffusion membrane of claim 1, wherein the first surface comprises a plurality of parallel arranged diffusion strips; each diffusion zone having a plurality of said first diffusion regions and a plurality of said first vacant regions along a length direction thereof; in each diffusion zone, the first diffusion region and the first vacant region are spaced apart.

12. The diffusion film of claim 11, wherein the first diffusion regions and the first vacant regions in two adjacent diffusion strips are staggered in a direction perpendicular to the length of the diffusion strips.

13. An imaging assembly, comprising:

a diffusion membrane as claimed in any one of claims 1 to 12;

14. The imaging assembly of claim 13, wherein the first surface of the diffuser film is on a side of an object to be imaged; when the incident light emitted by the light source and the diffusion film are incident at a second angle, the light reflected by the imaged object forms an image on the side where the light source is located.