CN219872106U

CN219872106U - Wide viewing angle orthographic projection screen capable of eliminating speckles

Info

Publication number: CN219872106U
Application number: CN202321342731.5U
Authority: CN
Inventors: 王朋
Original assignee: Shandong Weiseni Technology Co ltd
Current assignee: Shandong Weiseni Technology Co ltd
Priority date: 2023-05-30
Filing date: 2023-05-30
Publication date: 2023-10-20
Anticipated expiration: 2033-05-30

Abstract

A wide-view angle orthographic projection screen capable of dissipating speckles sequentially comprises a substrate shading layer, a reflecting ball array layer, a lens layer, a speckle reduction layer and an anti-dazzle layer, wherein the substrate shading layer is black; the reflective ball array layer is used for reflecting the incident projection light and comprises a plurality of reflective balls which are distributed in an array, and the reflective balls can reflect light rays towards all angles because the reflective surfaces of the reflective balls are spherical, so that the visual angle can be greatly improved. The lens layer is provided with a plurality of columnar lenses which are vertically distributed at intervals; the speckle reduction layer is formed by filling a first transparent material between the columnar lenses; the speckle reduction layer is provided with diffusion particles which can diffuse light to weaken the coherence of the light source, thereby greatly reducing or eliminating speckle effect. In addition, when light rays are emitted into the projection screen and reflected out of the projection screen, the light rays need to pass through multiple layers of transparent materials with different refractive indexes, and the diffusion angle of the light rays can be improved through multiple refraction treatments, so that the visual angle is improved, and the speckle effect is reduced.

Description

Wide viewing angle orthographic projection screen capable of eliminating speckles

[ field of technology ]

The utility model relates to a projection screen, in particular to a wide-viewing angle front projection screen capable of eliminating speckles.

[ background Art ]

The traditional metal screen has rough surfaces on the surfaces, the projection light is scattered in different directions, and due to the fact that the reflection degree of the metal layer on the surfaces is higher, the brightness of the projection light received by human eyes is different along with the difference of angles and viewing positions, if the front view is carried out, the front brightness is higher, the left and right sides are darker, and when the left view is carried out, the left brightness is higher than the right brightness, and the brightness gradually changed state from left to right occurs. In order to increase the visual angle, the projection screen of the cinema is designed into a large arc shape, which increases the visual angle to a certain extent, but solves the problem of poor visual angle. In addition, since the coherence of the laser light source is high, the laser projection device is prone to produce a speckle effect, i.e., a speckle effect, of granular light and dark phases on the projection screen when projected onto the projection screen. When the user looks for a long time, dizziness uncomfortable feeling is easy to generate, the quality of the projection image is further deteriorated, and the watching experience of the user is reduced.

[ utility model ]

The present utility model is directed to solving the above-mentioned problems and providing a wide viewing angle front projection screen that dissipates speckle.

In order to solve the problems, the utility model provides a wide-viewing-angle orthographic projection screen capable of dissipating speckles, which is characterized by sequentially comprising a substrate shading layer, a reflecting ball array layer, a lens layer, a speckle reduction layer and an anti-dazzle layer, wherein the substrate shading layer is black; the reflecting ball array layer is used for reflecting the incident projection light and comprises a plurality of reflecting balls distributed in an array; the lens layer is provided with a plurality of columnar lenses which are vertically distributed at intervals; the columnar lens is arched towards one side far away from the reflecting ball; the speckle reduction layer is formed by filling a first transparent material between the columnar lenses; the speckle reduction layer is provided with diffusion particles; the anti-dazzle layer is used for preventing glare;

further, the columnar lens is a semi-cylindrical lens.

Further, the lens layer further comprises a connecting portion, the connecting portion is connected to the non-arched end of the cylindrical lens, and the connecting portion and the cylindrical lens are integrally formed by a second transparent material.

Further, a third transparent material is filled between the lens layer and the gap of the reflective ball.

Further, the refractive index of the second transparent material is different from the refractive index of the third transparent material.

Further, the refractive index of the second transparent material is different from the refractive index of the first transparent material.

Further, the refractive index of the third transparent material is different from the refractive index of the first transparent material.

Further, the base light shielding layer is made of black glass fiber.

Further, the particle diameter of the diffusion particles is 10 to 100nm.

The present utility model has an advantageous contribution in that it effectively solves the above-mentioned problems. The wide-view-angle orthographic projection screen capable of dissipating the speckles is provided with the reflecting ball array layer, and the reflecting balls are used for reflecting projection light, so that the projection light can be reflected towards all angles to improve the visible angle; in addition, the projection screen is also provided with a speckle reduction layer, and the diffusion particles arranged in the speckle reduction layer can diffuse projection light to a plurality of angles, so that the coherence of a light source can be weakened, and speckle can be eliminated; in addition, a plurality of structural layers with different refractive indexes are arranged in front of the reflecting ball array layer, so that the light divergence angle can be further increased to improve the visible angle, and the speckle effect can be reduced. The wide-view angle orthographic projection screen capable of eliminating the speckles can eliminate the speckles and enlarge the visual angle, and has the characteristics of novel structure and practical function, and has strong practicability.

[ description of the drawings ]

Fig. 1 is a schematic view of the overall structure of the present utility model.

Fig. 2 is a schematic structural diagram of the present utility model.

The attached drawings are identified: the light-shielding substrate layer 10, the reflective ball array layer 20, the reflective balls 21, the lens layer 30, the lenticular lenses 31, the connection portions 32, the speckle reduction layer 40, the diffusion particles 41, the first transparent material 42, the anti-glare layer 50, and the third transparent material 60.

[ detailed description ] of the utility model

The following examples are further illustrative and supplementary of the present utility model and are not intended to limit the utility model in any way.

As shown in fig. 1 and 2, the speckle-removing wide-angle front projection screen of the present utility model includes, in order, a base light-shielding layer 10, a reflective ball array layer 20, a lens layer 30, a speckle reduction layer 40, and an antiglare layer 50. Wherein the anti-glare layer 50 is located on the positive side, i.e., the side facing the viewer. The base light-shielding layer 10 is located on the back side, i.e. the side remote from the viewer.

The reflective ball array layer 20 is used to reflect the incident projection light. The reflective ball array layer 20 includes a plurality of reflective balls 21 distributed in an array. The reflecting ball 21 has a spherical shape, and has a strong reflecting ability on its surface, and can reflect the projection light. The reflective spheres 21 may be made of a highly reflective material or may be made of a conventional material with a highly reflective material sprayed onto the surface. The highly reflective materials include, but are not limited to, light colored materials such as pearlescent paints, silver paints, white paints, and the like. The diameter of the reflecting balls 21 is smaller than 15um, and tens of millions of reflecting balls 21 are arranged on each square meter. In this embodiment, the reflective balls 21 are adjacent to each other, i.e., the distance between the reflective balls 21 is zero. When the projection light is incident on the reflective ball array layer 20, the reflective balls 2141 distributed in an array can reflect the incident projection light in all directions, thereby improving the reflective capability and increasing the viewing angle.

The base light shielding layer 10 is a base structure, and is used for carrying other structural layers and shielding backside ambient light. The substrate shading layer 10 is a black structure layer, which can shade and absorb the ambient light on the back side, so as to avoid the interference of the ambient light on the back side to the projection, and further improve the image contrast.

Since there is a gap between the reflective balls 21 when they are in close proximity, in order to avoid the loss of luminous flux due to the projection light passing through the gap between the reflective balls 21, the base light shielding layer 10 is made of black glass fiber having a reflective capability, and the surface thereof has a specular reflection effect, so that the projection light passing through between the reflective balls 21 can be reflected forward, and is incident on the reflective ball array layer 20 to continue to be reflected toward the viewer or to be reflected directly toward the viewer. In addition, the black glass fiber can provide a black background, and can shield ambient light to improve the picture contrast.

The lens layer 30 is disposed on a side of the reflective ball array layer 20 away from the base light shielding layer 10. The lens layer 30 is provided with a plurality of columnar lenses 31 distributed at intervals along the vertical direction. The lenticular lens 31 arches toward the side remote from the reflective sphere 21. In this embodiment, the columnar head is a semi-cylindrical lens. The non-domed ends of the semi-cylindrical lenses are connected together by a connection 32 so that the side of the lens layer 30 facing the reflective ball array layer 20 is planar and the side facing away from the reflective ball array layer 20 is rugged.

The cylindrical lens 31 and the connecting portion 32 are integrally formed, and each of them is made of a second transparent material. The material selection of the transparent material is not limited.

The speckle reduction layer 40 is used to reduce the coherence of the light source and reduce or eliminate the speckle effect. The speckle reduction layer 40 is formed by filling a first transparent material 42 between the lenticular lenses 31. The speckle reduction layer 40 has one side and the lenticular lens 31 fitted and combined with each other, and the other side has a planar surface, so that the antiglare layer 50 is conveniently provided. Diffusion particles 41 are provided in the speckle reduction layer 40. The diffusion particles 41 can diffuse light, so as to change the transmission angle of the projection light, so that the incident angle and the emergent angle of the projection light are diversified, the coherence of the light source can be reduced, and the visible angle can be improved. The first transparent material 42 of the speckle reduction layer 40 can be any known transparent material, including but not limited to PET, PVC, EVA, PC, PMMA, TPU, etc. The diffusion particles 41 may be made of a known material, and preferably have a particle diameter of 10 to 100nm. In practice, the diffusion particles 41 may be mixed in the first transparent material 42, then the first transparent material 42 is filled between the lenticular lenses 31, and after the first transparent material is cured and molded, the speckle reduction layer 40 is formed.

The refractive index of the first transparent material 42 is different from the refractive index of the second transparent material. Thus, when light passes through the junction surface of the lens layer 30 and the speckle reduction layer 40, refraction occurs to change the original transmission angle, and by reasonably selecting the refractive indexes of the first transparent material 42 and the second transparent material, the diffusion angle of the light can be improved to a certain extent to improve the visual angle and reduce the speckle effect.

The anti-glare layer 50 may be a known PET film, and the surface thereof may be frosted.

In addition, since the reflective ball array layer 20 is composed of a plurality of reflective balls 21, and a surface of the lens layer 30 facing the reflective ball array layer 20 is planar, a third transparent material 60 is filled between the lens layer 30 and the gap of the reflective balls 21 for convenience of processing and reducing speckle effect. The refractive index of the third transparent material 60 is different from that of the second transparent material, so that when the projection light passes through the junction surface of the lens layer 30 and the third transparent material 60, refraction occurs to change the original transmission angle, and by reasonably selecting the refractive indexes of the second transparent material and the third transparent material 60, the diffusion angle of the light can be improved to a certain extent to improve the visual angle, and the speckle effect can be reduced.

Further, the refractive indices of the first transparent material 42 and the third transparent material 60 are preferably different.

Thus, the speckle-free wide-viewing angle front projection screen of the present utility model is formed. In use, the projection device is placed in front of the projection screen facing the anti-glare layer 50. After passing through the anti-glare layer 50, the projection light emitted from the projection device passes through the speckle reduction layer 40 and the lens layer 30 in order, reaches the reflective ball array layer 20, is emitted forward by reflection from the reflective balls 21, and the reflected light passes through the lens layer 30, the speckle reduction layer 40, and the anti-glare layer 50 in order, and is emitted in the direction of the viewer. Since the reflective surface of the reflective ball 21 is spherical, it can reflect light rays toward various angles, so that it can greatly improve the viewing angle. In addition, when light rays are emitted into the projection screen and reflected out of the projection screen, the light rays need to pass through multiple layers of transparent materials with different refractive indexes, and the diffusion angle of the light rays can be improved through multiple refraction treatments, so that the visual angle is improved, and the speckle effect is reduced. In addition, the speckle reduction layer 40 has diffusion particles 41 disposed therein, which diffuse light to weaken the coherence of the light source, thereby greatly reducing or eliminating speckle effects. The wide-view front projection screen capable of eliminating the speckles has the characteristics of novel structure, practical function and wide viewing angle, has strong practicability and is suitable for being widely popularized.

Although the present utility model has been disclosed by the above embodiments, the scope of the present utility model is not limited thereto, and each of the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the present utility model.

Claims

1. A speckle-dissipative wide viewing angle front projection screen comprising, in order:

a base light shielding layer (10) which is black;

the reflecting ball array layer (20) is used for reflecting the incident projection light and comprises a plurality of reflecting balls (21) distributed in an array;

the lens layer (30) is provided with a plurality of columnar lenses (31) which are vertically distributed at intervals; the cylindrical lens (31) arches towards the side far away from the reflecting sphere (21);

a speckle reduction layer (40) formed by filling a first transparent material (42) between the lenticular lenses (31); diffusion particles (41) are arranged in the speckle reduction layer (40);

an anti-glare layer (50) for preventing glare.

2. A speckle-dissipative wide-angle front projection screen according to claim 1, wherein the lenticular lens (31) is a semi-cylindrical lens.

3. The speckle-free wide-angle front projection screen of claim 1, wherein the lens layer (30) further comprises a connecting portion (32), the connecting portion (32) being connected to the non-domed end of the lenticular lens (31), the connecting portion (32) being integrally formed with the lenticular lens (31) from a second transparent material.

4. A speckle-dissipative wide-angle front projection screen according to claim 3, wherein a third transparent material (60) is filled between the lens layer (30) and the gap of the reflective spheres (21).

5. The speckle-dissipative wide-angle front projection screen of claim 4, wherein the refractive index of the second transparent material is different from the refractive index of the third transparent material (60).

6. The speckle-dissipative wide-angle front projection screen of claim 4, wherein the refractive index of the second transparent material is different from the refractive index of the first transparent material (42).

7. The speckle-dissipative wide viewing angle front projection screen of claim 4, wherein the refractive index of the third transparent material (60) is different from the refractive index of the first transparent material (42).

8. A speckle-dissipative wide-angle front projection screen according to claim 1, wherein the base opacifying layer (10) is made of black glass fiber.

9. A speckle-free wide-angle front projection screen according to claim 1, characterized in that the diffusing particles (41) have a particle size of 10-100 nm.