CN211086909U

CN211086909U - Fresnel membrane and display assembly

Info

Publication number: CN211086909U
Application number: CN201922015115.9U
Authority: CN
Inventors: 胡飞; 王霖; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-07-24
Anticipated expiration: 2029-11-20
Also published as: WO2021098516A1

Abstract

The utility model provides a Fresnel membrane, including substrate layer and refraction and reflection micro-structure layer. The substrate layer comprises a first substrate surface and a second substrate surface which are opposite to each other. The catadioptric micro-structure layer is arranged on the first substrate surface and comprises a plurality of micro-prism units, the micro-prism units are arranged to form a plurality of concentric circular arcs, each micro-prism unit comprises an incident surface and a reflecting surface, the incident surface and the inner angle of the first substrate surface are acute angles, and the inner angles of the micro-prism units on different concentric circular arcs are different. The utility model also provides a display module. The utility model provides a fei nieer diaphragm and display module sets up the microprism unit through the first substrate face at the substrate layer, and every microprism unit all contains an incident surface and plane of reflection, and light takes place the refraction back on the incident surface, takes place the total reflection at the plane of reflection again, has increased the quantity of collimation output outgoing light in spectator's the visual field.

Description

Fresnel membrane and display assembly

Technical Field

The utility model relates to the field of optical technology, particularly, relate to a fei nieer diaphragm and display module.

Background

The rear projection screen comprises a Fresnel membrane, the Fresnel membrane needs a fixed focal length to collimate an image of the projector to a field of view of audiences, the conventional Fresnel membrane is realized by the principle of refraction, however, the refraction at a large angle easily causes dispersion, so that light rays incident to the field of view of the audiences are less, and the requirements of users cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fei nieer diaphragm and display module to solve above-mentioned problem.

The embodiment of the utility model provides an above-mentioned purpose is realized through following technical scheme.

In a first aspect, the present invention provides a fresnel membrane, which includes a substrate layer and a catadioptric microstructure layer. The substrate layer comprises a first substrate surface and a second substrate surface which are opposite to each other. The refraction and reflection micro-structure layer is arranged on the first base material surface and comprises a plurality of micro-prism units, the micro-prism units are arranged to form a plurality of concentric circular arcs, each micro-prism unit comprises an incident surface and a reflection surface, the incident surface is an acute angle with the inner angle of the first base material surface, the inner angles of the micro-prism units on different concentric circular arcs are different, when light enters the micro-prism units from the circle center, the light is reflected by the reflection surface after entering from the incident surface and then exits from the second base material surface through the first base material surface.

In one embodiment, the fresnel membrane further comprises a diffusion layer or surface diffusion layer, which is located on the second substrate side.

In one embodiment, the fresnel membrane further comprises a diffusion layer and a surface diffusion layer, the diffusion layer being located between the second substrate face and the surface diffusion layer.

In one embodiment, the fresnel membrane further comprises an absorption layer, which is located between the diffusion layer and the surface diffusion layer.

In one embodiment, the fresnel film further includes a refraction layer, and the light exits through the refraction and reflection micro-structure layer and the refraction layer in sequence, and the refraction layer has a refractive index greater than that of the refraction and reflection micro-structure layer to reduce the exit angle of the light.

In one embodiment, the refractive layer is disposed on the second substrate side.

In one embodiment, the incident surface includes a first incident region and a second incident region, the second incident region is connected between the first incident region and the first substrate surface, an included angle between the first incident region and the first substrate surface is a first inclined angle, an included angle between the second incident region and the first substrate surface is a second inclined angle, and the first inclined angle is larger than the second inclined angle.

In one embodiment, the cross section of the microprism unit is triangular, and the internal angle between the incident surface and the first substrate surface is between 70 and 90 degrees.

In one embodiment, the width of the microprism unit on the surface of the first substrate is between 0.05mm and 0.5mm, and the distance between the microprism units on two adjacent concentric arcs is between 0.05mm and 0.5 mm.

In a second aspect, the present invention further provides a display assembly, including display unit, projection lens and the fresnel membrane of any of the above embodiments, the display unit is used for emitting projection light, and the projection lens is used for projecting the projection light that the display unit sent to the fresnel membrane.

In one embodiment, the projection lens includes a lens group and a reflector, the projection light is condensed by the lens group and reflected by the reflector, and then is incident on the fresnel membrane, and the centers of the plurality of concentric arcs are located on the optical axis of the lens group.

In one embodiment, the projection light is at an angle of 10 ° to 70 ° to the entrance face.

Compared with the prior art, the utility model provides a fresnel membrane and display module sets up the microprism unit through the first substrate face at the substrate layer, and every microprism unit all contains an incident surface and a plane of reflection, and light takes place the refraction back on the incident surface, takes place the total reflection at the plane of reflection again, has increased the quantity of outgoing light in the collimation output spectator's the field of view.

These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first fresnel membrane provided in an embodiment of the present invention.

Fig. 2 is a schematic view of a microstructure of a first fresnel membrane according to an embodiment of the present invention.

Fig. 3 is an optical path diagram of a first fresnel membrane provided in an embodiment of the present invention.

Fig. 4 is an optical path diagram of a second fresnel membrane provided in the embodiment of the present invention.

Fig. 5 is an optical path diagram of a third fresnel membrane provided in the embodiment of the present invention

Fig. 6 is an optical path diagram of a fourth fresnel membrane provided in the embodiment of the present invention.

Fig. 7 is an optical path diagram of a fifth fresnel membrane provided in the embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a sixth fresnel membrane provided in the embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a seventh fresnel membrane provided in the embodiment of the present invention.

Fig. 10 is an optical path diagram of an eighth fresnel membrane provided in the embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a display module according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the embodiments of the present invention, the embodiments of the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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 embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 and fig. 2, the present invention provides a fresnel film 10, which includes a substrate layer 101 and a refraction-reflection microstructure layer 100. Wherein the substrate layer 101 comprises opposing first and second substrate faces 1012, 1014. The catadioptric microstructure layer 100 is disposed on the first substrate surface 1012, the catadioptric microstructure layer 100 includes a plurality of micro prism units 110, the micro prism units 110 are arranged to form a plurality of concentric arcs, a circle center P of the plurality of concentric arcs is located on an outer side of the fresnel membrane 10, and the circle center P of the concentric arcs may be a rotation center of the fresnel membrane 10. Each micro prism unit 110 includes an incident surface 111 and a reflecting surface 113, an inner angle between the incident surface 111 and the first substrate surface 1012 is an acute angle, inner angles of the micro prism units 110 on different concentric arcs are different, when a light ray enters the plurality of micro prism units 110 from the circle center P, the light ray is reflected by the reflecting surface 113 after entering from the incident surface 111, and then exits from the second substrate surface 1014 through the first substrate surface 1012.

Specifically, the shape of the substrate layer 101 may be a rectangle, a circle, an ellipse, a rhombus, a trapezoid, or the like, and may be specifically set according to actual needs. In this embodiment, a rectangular shape is taken as an example for explanation. The substrate layer 101 may rotate around the center P of the circle and in a direction perpendicular to the first substrate surface 1012, so that the emergent light may form a larger light spot. The material of the substrate layer 101 may be a transparent organic material such as PC (Polycarbonate), PMMA (polymethyl methacrylate), or PET (Polyethylene terephthalate).

The catadioptric microstructure layer 100 is disposed on the substrate layer 101, so the shape of the catadioptric microstructure layer 100 may be the same as that of the substrate layer 101, and the catadioptric microstructure layer 100 may be distributed on the whole substrate layer 101 or on part of the substrate layer 101.

In the present embodiment, the cross-section of the micro prism unit 110 may be triangular, and the micro prism unit 110 includes an incident surface 111, a reflecting surface 113, and a side surface 115, wherein the side surface 115 is attached to the first substrate surface 1012 and is connected between the incident surface 111 and the reflecting surface 113. The inner angle of the incident surface 111 and the first substrate surface 1012 is an acute angle for mold release when the microprism unit 110 is manufactured by a molding process. The incident surface 111 may refract the incident light, and the reflecting surface 113 may totally reflect the incident light. The microprism unit 110 is based on the catadioptric principle, that is, the light can be collimated and output to the field of view of the viewer after being refracted by the incident surface 111 and totally reflected by the reflecting surface 113.

Referring to fig. 3, in the present embodiment, an inner angle between the incident surface 111 and the first substrate surface 1012 varies with the position of the microprism unit 110, that is, the inner angles of the microprism units 110 on different concentric arcs are different, and as an example, the inner angle may be between 70 ° and 90 °. In this embodiment, from the center P to the direction of the concentric arc, the inner angle between the incident surface 111 and the first substrate surface 1012 gradually increases, and the included angle between the reflective surface 113 and the side surface 115 does not change, so that the number of emergent rays collimated and output to the field of view of the viewer can be increased. As an example, the angle between the reflective surface 113 and the side surface 115 is between 30 ° and 60 °.

Referring to fig. 4, in other embodiments, the inner angle between the incident surface 111 and the first substrate surface 1012 is constant from the center P to the direction of the concentric arc, and the included angle between the reflective surface 113 and the side surface 115 may vary with the angle of the incident light, for example, the larger the angle of the incident light, the larger the included angle between the reflective surface 113 and the side surface 115, and the number of outgoing light rays collimated and output to the field of view of the viewer may be increased.

Referring to fig. 5, in some other embodiments, the inner angle between the incident surface 111 and the first substrate surface 1012 gradually increases from the center P to the direction of the concentric arc, and the included angle between the reflective surface 113 and the side surface 115 may change with the angle of the incident light, and may also increase the number of outgoing light rays collimated and output to the viewing field of the viewer.

In other embodiments, the cross-section of the micro prism unit 110 may also be trapezoidal, and the micro prism unit 110 may also include an incident surface 111, a reflective surface 113, and a side surface 115. It is understood that the cross section of the microprism elements 110 may be pentagonal, hexagonal or other polygonal shapes, so as to reflect and collimate the light to the viewer's field of view.

The width of the microprism elements 110 relative to the first substrate surface 1012 may be between 0.05mm and 0.5mm, and may be formed directly on the first substrate surface 1012 by a single point diamond, or may be formed on a surface of a metal such as aluminum or copper by, for example, hot embossing, and then transferred to the first substrate surface 1012 by embossing.

The distance between the microprism units 110 on two adjacent concentric arcs can be between 0.05mm and 0.5mm, so as to ensure the resolution of the screen, i.e. the representation capability of the screen on details.

Referring to fig. 2 and 6, in the present embodiment, the incident surface 111 includes a catadioptric region L1 and a refractive region L2, where the catadioptric region L1 refers to a region of the incident surface 111 corresponding to the light incident on the micro-prism unit 110 being refracted and totally reflected and then emitted from the substrate layer 101, and the refractive region L2 refers to a region of the incident surface 111 corresponding to the light emitted from the substrate layer 101 after being refracted once, and a ratio of the catadioptric region L1 to the refractive region L2 is defined as a duty ratio of the micro-prism unit 110, and only the light in the catadioptric region L1 will enter a field of view of a viewer.

Referring to fig. 6 and 7, in other embodiments, the incident surface 111 may include a first incident region 1112 and a second incident region 1114, wherein the second incident region 1114 is connected between the first incident region 1112 and the first substrate surface 1012, the first incident region 1112 may correspond to a refraction and reflection region, and the second incident region 1114 may correspond to a refraction and reflection region L2, the first incident region 1112 forms a first inclination angle with the first substrate surface 1012, the second incident region 1114 forms a second inclination angle with the first substrate surface 1012, the first inclination angle is larger than the second inclination angle, that is, the second inclination angle is smaller than the first inclination angle, so that the angle formed by the refraction of the incident light ray with the second incident region 1114 is smaller than the angle formed by the refraction of the first incident region 1112 on the basis that the direction of the incident light ray is unchanged, that is, the second inclination angle is smaller than the first inclination angle, so that the duty ratio of the reflected light ray 113 and the emergent surface 110 can be increased.

In some embodiments, fresnel membrane 10 may further include a diffusion layer 102, and diffusion layer 102 may be located on second substrate face 1014. In still other embodiments, the fresnel membrane 10 may further include a surface diffuser layer 103, and the surface diffuser layer 103 may be located on the second substrate side 1014.

Referring to fig. 8, in other embodiments, fresnel membrane 10 may further include both diffusion layer 102 and surface diffusion layer 103, and diffusion layer 102 is located between second substrate surface 1014 and surface diffusion layer 103.

Referring to fig. 9, in other embodiments, in order to increase the transmittance of the screen, the fresnel membrane 10 may further include an absorption layer 104, and the absorption layer 104 is located between the diffusion layer 102 and the surface diffusion layer 103.

Referring to fig. 10, in one embodiment, the fresnel film 10 further includes a refraction layer 105, and the light sequentially exits through the refraction and reflection micro-structure layer 100 and the refraction layer 105, and the refraction layer 105 has a refractive index greater than that of the refraction and reflection micro-structure layer 100 to reduce the exit angle of the light. The light exiting through the second substrate surface 1014 and entering the refractive layer 105 at a reduced exit angle may increase the amount of light entering the viewer's field of view.

In some embodiments, the refractive layer 105 may be disposed on the second substrate side 1014 and may also be located between the second substrate side 1014 and the diffusion layer 102. In other embodiments, refractive layer 105 may also be located between diffusion layer 102 and surface diffusion layer 103.

To sum up, the utility model provides a fresnel membrane 10 and display module 1 sets up microprism unit 110 through first substrate face 1012 at substrate layer 101, and every microprism unit 110 all contains an incident surface 111 and a plane of reflection 113, and light takes place the refraction back on incident surface 111, takes place the total reflection again in plane of reflection 113, has increased the quantity of collimation output outgoing light in spectator's the visual field.

Referring to fig. 11, the present invention further provides a display module 1, which includes a display unit 20, a projection lens 30 and a fresnel membrane 10, wherein the display unit 20 is used for emitting projection light, and the projection lens 30 is used for projecting the projection light emitted from the display unit 20 to the fresnel membrane 10.

Specifically, the projection lens 30 includes a lens group 32 and a reflector, and the projection light is incident to the fresnel membrane 10 after being condensed by the lens group 32 and reflected by the reflector, and in the present embodiment, the centers P of a plurality of concentric arcs may be located on the optical axis of the lens group 32. According to the principle of rotational symmetry, the center P (center of rotation) of the circle is disposed on the optical axis of the lens assembly 32, so that the projection light can be more uniformly emitted to the field of view of the viewer after being collimated by the microprism unit 110.

In the present embodiment, the display unit 20 is incident from below the fresnel film 10, so the angle between the projected light and the incident surface 111 gradually increases from the center P to the direction of the concentric circular arc as shown in fig. 11, the angle between the projected light and the incident surface 111 increases from α to β from the center P to the direction of the concentric circular arc as an example, the angle between the projected light and the incident surface 111 may be 10 ° to 70 °.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A fresnel membrane, characterized in that it comprises:

the substrate layer comprises a first substrate surface and a second substrate surface which are opposite to each other; and

the refraction and reflection micro-structure layer is arranged on the first base material surface and comprises a plurality of micro-prism units, the micro-prism units are arranged to form a plurality of concentric circular arcs, each micro-prism unit comprises an incident surface and a reflection surface, the incident surface and an inner angle formed by the first base material surface are acute angles and different, the inner angles of the micro-prism units on the concentric circular arcs are different, when light is incident to the micro-prism units from the circle center of the concentric circular arcs, the light is reflected by the reflection surface after being incident from the incident surface, and then the light is emitted from the second base material surface through the first base material surface.

2. The fresnel membrane according to claim 1, further comprising a diffusion layer or a surface diffusion layer, the diffusion layer or the surface diffusion layer being located at the second substrate face.

3. The fresnel membrane of claim 1 further comprising a diffusion layer and a surface diffusion layer, the diffusion layer being located between the second substrate face and the surface diffusion layer.

4. The fresnel membrane according to claim 3, further comprising an absorbing layer located between the diffusion layer and the surface diffusion layer.

5. The fresnel membrane according to any one of claims 1 to 4, further comprising a refractive layer, wherein the light rays exit through the catadioptric microstructure layer and the refractive layer in this order, and wherein the refractive index of the refractive layer is greater than the refractive index of the catadioptric microstructure layer, so as to reduce the exit angle of the light rays.

6. The fresnel film sheet of claim 5, wherein the refractive layer is disposed on the second substrate side.

7. The fresnel membrane according to claim 1, wherein the incident surface comprises a first incident region and a second incident region, the second incident region being connected between the first incident region and the first substrate surface, the first incident region being at a first oblique angle with respect to the first substrate surface, the second incident region being at a second oblique angle with respect to the first substrate surface, the first oblique angle being greater than the second oblique angle.

8. The fresnel film according to claim 1, wherein the cross-section of the microprism elements is triangular and the internal angle of the incident surface to the first substrate surface is between 70 ° and 90 °.

9. The fresnel film sheet according to claim 1, wherein the width of the microprism elements on the side facing the first substrate is between 0.05mm and 0.5mm, and the pitch of the microprism elements on two adjacent concentric arcs is between 0.05mm and 0.5 mm.

10. A display assembly comprising a display unit for emitting projection light, a projection lens for projecting the projection light emitted by the display unit onto the fresnel membrane, and the fresnel membrane of claim 1.

11. The display assembly of claim 10, wherein the projection lens comprises a lens group and a reflector, the projection light is incident on the fresnel membrane after being condensed by the lens group and reflected by the reflector, and centers of the plurality of concentric arcs are located on an optical axis of the lens group.

12. The display assembly of claim 10, wherein the projected light rays are at an angle of 10 ° to 70 ° to the incident surface.