CN211086909U - Fresnel membrane and display assembly - Google Patents

Abstract

The utility model provides a Fresnel film, which comprises a base material layer and a refraction and reflection microstructure layer. Wherein, the substrate layer includes a first substrate surface and a second substrate surface opposite to each other. The catadioptric microstructure layer is arranged on the surface of the first substrate, and the catadioptric microstructure layer includes a plurality of microprism units, and the plurality of microprism units are arranged to form a plurality of concentric arcs, and each microprism unit includes an incident surface and a reflection surface , the inner angle of the incident surface and the surface of the first substrate is an acute angle, and the inner angles of the microprism units on different concentric arcs are different. The utility model also provides a display assembly. In the Fresnel film and the display assembly provided by the utility model, micro-prism units are arranged on the first substrate surface of the substrate layer, each micro-prism unit includes an incident surface and a reflection surface, and light is generated on the incident surface. After refraction, total reflection occurs on the reflective surface, which increases the number of outgoing rays that are collimated and output to the viewer's field of view.

Description

Fresnel diaphragm and display components

technical field

The utility model relates to the field of optical technology, in particular to a Fresnel diaphragm and a display assembly.

Background technique

Compared with LCD TV or LED display, the rear projection screen uses a laser light source, which has a better color gamut and a more comfortable and soft display. The rear projection screen includes a Fresnel diaphragm. The Fresnel diaphragm requires a fixed focal length to align the projector's image to the audience's field of view. The existing Fresnel diaphragm is mostly realized by the principle of refraction, but the large angle The refraction is prone to dispersion phenomenon, resulting in less light entering the field of view of the audience, which cannot meet the needs of users.

Utility model content

The purpose of the present invention is to provide a Fresnel diaphragm and a display assembly to solve the above problems.

The embodiments of the present invention achieve the above objects through the following technical solutions.

In a first aspect, the present invention provides a Fresnel diaphragm, which includes a base material layer and a catadioptric microstructure layer. Wherein, the substrate layer includes a first substrate surface and a second substrate surface opposite to each other. The catadioptric microstructure layer is arranged on the surface of the first substrate, and the catadioptric microstructure layer includes a plurality of microprism units, and the plurality of microprism units are arranged to form a plurality of concentric arcs, and each microprism unit includes an incident surface and a reflection surface , the inner angle between the incident surface and the first substrate surface is an acute angle, and the inner angles of the microprism units on different concentric arcs are different. When the light enters multiple microprism units from the center of the circle, the light is incident from the incident surface and then reflected by the reflecting surface. , and then exit from the second substrate surface through the first substrate surface.

In one embodiment, the Fresnel membrane further includes a bulk diffusion layer or a surface diffusion layer, and the bulk diffusion layer or the surface diffusion layer is located on the surface of the second substrate.

In one embodiment, the Fresnel diaphragm further includes a bulk diffusion layer and a surface diffusion layer, and the bulk diffusion layer is located between the second substrate surface and the surface diffusion layer.

In one embodiment, the Fresnel diaphragm further includes an absorber layer located between the bulk diffusion layer and the surface diffusion layer.

In one embodiment, the Fresnel diaphragm further includes a refraction layer, and the light exits through the catadioptric microstructure layer and the refraction layer in sequence, and the refractive index of the refractive layer is greater than that of the catadioptric microstructure layer, so as to reduce the refraction of the light. Exit angle.

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

In one embodiment, the incident surface includes a first incident area and a second incident area, the second incident area is connected between the first incident area and the first substrate surface, and the first incident area and the first substrate surface have a gap between the first incident area and the first substrate surface. The included angle is the first inclination angle, the included angle between the second incident region and the first substrate surface is the second inclination angle, and the first inclination angle is greater than the second inclination angle.

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

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 0.5mm. between mm.

In a second aspect, the present invention also provides a display assembly, comprising a display unit, a projection lens and the Fresnel diaphragm of any of the above embodiments, the display unit is used to emit projection light, and the projection lens is used to emit light emitted by the display unit. Projection light is projected onto the Fresnel diaphragm.

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 incident on the Fresnel diaphragm, and the centers of the plurality of concentric arcs are located in the light of the lens group. on the axis.

In one embodiment, the included angle between the projection light and the incident surface is 10° to 70°.

Compared with the prior art, the Fresnel film and the display assembly provided by the present utility model, by arranging microprism units on the first substrate surface of the substrate layer, each microprism unit includes an incident surface and a reflection surface. After the light is refracted on the incident surface, it is totally reflected on the reflective surface, which increases the number of outgoing rays in the field of view that are collimated and output to the audience.

These and other aspects of the present invention will be more clearly understood in the description of the following embodiments.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a first Fresnel diaphragm provided by an embodiment of the present invention.

FIG. 2 is a schematic view of the microstructure of the first Fresnel diaphragm provided by the embodiment of the present invention.

FIG. 3 is an optical path diagram of the first Fresnel diaphragm provided by the embodiment of the present invention.

FIG. 4 is an optical path diagram of the second Fresnel diaphragm provided by the embodiment of the present invention.

Fig. 5 is the optical path diagram of the third Fresnel diaphragm provided by the embodiment of the present invention

FIG. 6 is an optical path diagram of the fourth Fresnel diaphragm provided by the embodiment of the present invention.

FIG. 7 is an optical path diagram of the fifth Fresnel diaphragm provided by the embodiment of the present invention.

8 is a schematic structural diagram of a sixth Fresnel diaphragm provided by an embodiment of the present invention.

9 is a schematic structural diagram of a seventh Fresnel diaphragm provided by an embodiment of the present invention.

FIG. 10 is an optical path diagram of the eighth Fresnel diaphragm provided by the embodiment of the present invention.

FIG. 11 is a schematic structural diagram of a display assembly provided by an embodiment of the present invention.

Detailed ways

In order to facilitate the understanding of the embodiments of the present invention, a more comprehensive description of the embodiments of the present invention will be given below with reference to the related drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the embodiments of the present invention herein are only for the purpose of describing specific implementations, and are not intended to limit the present invention.

Please refer to FIG. 1 and FIG. 2 , the present invention provides a Fresnel film 10 , which includes a base material layer 101 and a catadioptric microstructure layer 100 . The substrate layer 101 includes a first substrate surface 1012 and a second substrate surface 1014 that are opposite to each other. The catadioptric microstructure layer 100 is disposed on the first substrate surface 1012, and the catadioptric microstructure layer 100 includes a plurality of microprism units 110, and the plurality of microprism units 110 are arranged to form a plurality of concentric arcs, and the centers of the plurality of concentric arcs P is located outside the Fresnel diaphragm 10 , and the center P of the concentric arcs may be the rotation center of the Fresnel diaphragm 10 . Each microprism unit 110 includes an incident surface 111 and a reflective surface 113. The inner angle of the incident surface 111 and the first substrate surface 1012 is an acute angle. The inner angles of the microprism units 110 on different concentric arcs are different. When incident on the plurality of microprism units 110 , the light is incident from the incident surface 111 and then reflected by the reflecting surface 113 , and then exits from the second substrate surface 1014 through the first substrate surface 1012 .

Specifically, the shape of the base material layer 101 may be a rectangle, a circle, an ellipse, a rhombus, or a trapezoid, etc., which may be set according to actual needs. In this embodiment, a rectangle is used as an example for description. The base material layer 101 can be rotated with the circle center P as the rotation center, and the direction perpendicular to the first base material surface 1012 can be rotated as the rotation direction, so that the emitted light can form a larger spot. The material of the base material layer 101 may be PC (Polycarbonate, polycarbonate), PMMA (polymethylmethacrylate, polymethyl methacrylate or acrylic), or PET (Polyethylene terephthalate, polyethylene terephthalate) and other transparent materials. organic material.

The catadioptric microstructure layer 100 is disposed on the base material layer 101, so the shape of the catadioptric microstructure layer 100 can be the same as the shape of the base material layer 101. The catadioptric microstructure layer 100 can be distributed over the entire base material layer 101, or can be distributed on part of the base material layer 101 .

In this embodiment, the cross section of the microprism unit 110 may be a triangle, and the microprism unit 110 includes an incident surface 111 , a reflective surface 113 and a side surface 115 , wherein the side surface 115 is attached to the first substrate surface 1012 and connected to the incident surface 111 and the reflective surface 113. The inner angle between the incident surface 111 and the first substrate surface 1012 is an acute angle, so that the mold can be demolded when the microprism unit 110 is manufactured through the molding process. The incident surface 111 can refract the incident light, and the reflection surface 113 can completely reflect the incident light. The microprism unit 110 is based on the principle of catadioptric reflection, that is, the light can be collimated and output to the viewer's field of view after being refracted by the incident surface 111 and totally reflected by the reflecting surface 113 .

Referring to FIG. 3 , in this embodiment, the inner angles of the incident surface 111 and the first substrate surface 1012 vary with the position of the micro-prism unit 110 , that is, the inner angles of the micro-prism units 110 on different concentric arcs are different, As an example, the interior angle may be between 70° and 90°. In this embodiment, from the center P to the direction of the concentric circular 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 remains unchanged, and the accuracy can be increased. The number of outgoing rays in the field of view until the output reaches the viewer. As an example, the included angle between the reflective surface 113 and the side surface 115 is between 30° and 60°.

Referring to FIG. 4 , in other embodiments, in the direction from the center P to the concentric arc, the internal angle between the incident surface 111 and the first substrate surface 1012 is constant, and the angle between the reflective surface 113 and the side surface 115 can be It varies with the angle of incident light. For example, the larger the angle of incident light is, the larger the angle between the reflective surface 113 and the side surface 115 is, which can increase the number of outgoing light rays collimated and output to the viewer's field of view.

Referring to FIG. 5 , in other embodiments, from the center P to the direction of the concentric arcs, the inner angle between the incident surface 111 and the first substrate surface 1012 gradually increases, and the angle between the reflection surface 113 and the side surface 115 increases gradually. The angle can vary with the angle of the incoming light rays, or it can increase the number of outgoing rays in the field of view of the collimated output to the viewer.

In other embodiments, the cross section of the microprism unit 110 may also be a trapezoid, and the microprism unit 110 may also include an incident surface 111 , a reflection surface 113 and a side surface 115 . It can be understood that the cross section of the microprism unit 110 may also be a pentagon, a hexagon or other polygons, as long as the functions of light refraction and collimation output to the viewer's field of view are satisfied.

The width of the microprism unit 110 on the first substrate surface 1012 can be between 0.05 mm and 0.5 mm, and can be directly processed and formed on the first substrate surface 1012 by single-point diamond, or can be formed by using a method such as hot embossing. The method is first processed on the surface of metal such as aluminum or copper, and then copied to the first substrate surface 1012 by means of embossing.

The distance between the micro-prism units 110 on two adjacent concentric arcs may be between 0.05 mm and 0.5 mm, so as to ensure the resolution of the screen, that is, the ability of the screen to express details.

Please refer to FIG. 2 and FIG. 6 , in this embodiment, the incident surface 111 includes a catadioptric area L1 and a refraction area L2, wherein the catadioptric area L1 refers to the light incident on the microprism unit 110 after refraction and total reflection and then from The area of the incident surface 111 corresponding to the base material layer 101 exits, and the refraction area L2 refers to the area of the incident surface 111 corresponding to the light rays exiting from the base material layer 101 after one refraction. The ratio of the catadioptric area L1 to the refraction area L2 is defined as the duty ratio of the microprism unit 110, and only the light of the catadioptric area L1 will enter the viewer's field of view.

Referring to FIGS. 6 and 7 , in other embodiments, the incident surface 111 may include a first incident area 1112 and a second incident area 1114 , wherein the second incident area 1114 is connected to the first incident area 1112 and the first incident area 1114 Between the substrate surfaces 1012, the first incident area 1112 may correspond to the refraction area, and the second incident area 1114 may correspond to the refraction area L2. The angle between the first incident area 1112 and the first substrate surface 1012 is the first inclination angle, the angle between the second incident area 1114 and the first substrate surface 1012 is the second inclination angle, and the first inclination angle is greater than the second inclination angle horn. That is, the second inclination angle is smaller than the first inclination angle, so on the basis that the direction of the incident light remains unchanged, the angle between the incident light and the second incident area 1114 is smaller than the angle between the incident light and the first incident area 1112. horn. That is, the refraction angle generated by the refraction of the light passing through the second incident area 1114 is smaller than the refraction angle generated by the refraction passing through the first incident area 1112, that is, by setting the second inclination angle to be smaller than the first inclination angle, part of the light can be made to pass through the first incident area 1112. The refraction of the second incident area 1114 and the reflection of the reflective surface 113 re-exit, so the duty ratio of the micro-prism unit 110 can be increased.

In some embodiments, the Fresnel diaphragm 10 may further include a bulk diffusion layer 102 , and the bulk diffusion layer 102 may be located on the second substrate surface 1014 . In other embodiments, the Fresnel diaphragm 10 may further include a surface diffusion layer 103 , and the surface diffusion layer 103 may be located on the second substrate surface 1014 .

Referring to FIG. 8 , in other embodiments, the Fresnel membrane 10 may also include a bulk diffusion layer 102 and a surface diffusion layer 103 , and the bulk diffusion layer 102 is located between the second substrate surface 1014 and the surface diffusion layer 103 . between.

Referring to FIG. 9 , in other embodiments, in order to improve the transmittance of the screen, the Fresnel film 10 may further include an absorption layer 104 located between the bulk diffusion layer 102 and the surface diffusion layer 103 .

Referring to FIG. 10 , in one embodiment, the Fresnel film 10 further includes a refractive layer 105 , and the light is emitted through the catadioptric microstructure layer 100 and the refractive layer 105 in sequence, and the refractive index of the refractive layer 105 is greater than that of the catadioptric microstructure The refractive index of the layer 100 to reduce the exit angle of light. After the light exits through the second substrate surface 1014 and then enters the refraction layer 105, the exit angle decreases, which can 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 surface 1014 , and may also be located between the second substrate surface 1014 and the bulk diffusion layer 102 . In other embodiments, the refractive layer 105 may also be located between the bulk diffusion layer 102 and the surface diffusion layer 103 .

To sum up, in the Fresnel film 10 and the display assembly 1 provided by the present invention, the microprism units 110 are arranged on the first substrate surface 1012 of the substrate layer 101 , and each microprism unit 110 includes an incident surface 111 and a reflective surface 113, after the light is refracted on the incident surface 111, it is totally reflected on the reflective surface 113, which increases the number of outgoing light rays collimated and outputted to the viewer's field of view.

Referring to FIG. 11 , the present invention also provides a display assembly 1 , which includes a display unit 20 , a projection lens 30 and a Fresnel diaphragm 10 . The display unit 20 is used for emitting projection light, and the projection lens 30 is used for The emitted projection light is projected onto the Fresnel diaphragm 10 .

Specifically, the projection lens 30 includes a lens group 32 and a reflector, and the projection light is incident on the Fresnel diaphragm 10 after being collected by the lens group 32 and reflected by the reflector. The center P may be located on the optical axis of the lens group 32 . According to the principle of rotational symmetry, the center P (rotation center) is set on the optical axis of the lens group 32, so that the projection light can be more uniformly emitted into the field of view of the audience after being collimated by the microprism unit 110.

In this embodiment, the display unit 20 is incident from below the Fresnel diaphragm 10 , so the angle between the projection light and the incident surface 111 gradually increases from the center P to the direction of the concentric arc. As shown in FIG. 11 , from the center P to the direction of the concentric circular arc, the angle between the projection light and the incident surface 111 increases from α to β. As an example, the angle between the projection light and the incident surface 111 may be 10° to 70°.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (12)

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.

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