WO2016101404A1

WO2016101404A1 - Ultra-short focus laser projection display screen and ultra-short focus laser projection device

Info

Publication number: WO2016101404A1
Application number: PCT/CN2015/072762
Authority: WO
Inventors: 王志煌
Original assignee: 海信集团有限公司
Priority date: 2014-12-26
Filing date: 2015-02-11
Publication date: 2016-06-30
Also published as: CN105785703B; CN105785703A

Abstract

An ultra-short focus laser projection display screen comprises a reflecting layer (31). The reflecting layer (31) is composed of a plurality of arc-shaped micro-convex structure units (302), each of which is arranged in sequence to form an upper semicircle pattern. The acute intersection angle between the tangent plane (311) of the surface of the micro-convex structure (301) which receives incident light and the reflecting layer (31) increases gradually from the center of the upper semicircle outward, such that the light emitted from an ultra-short focus lens is reflected to be parallel or substantially parallel light after being incident onto the reflecting layer (31). The projection display screen enables the incident light in a large angle range to be reflected to be parallel or substantially parallel light. The reflecting layer (31) can be formed on any installation plane by spraying. The transportation and the installation of the screen are both easy. A projection device comprising such an ultra-short focus laser projection display screen is further disclosed.

Description

Ultra-short-focus laser projection display screen and ultra-short-focus laser projection device

Technical field

The present invention relates to the field of laser projection display, and more particularly to an ultra-short-focus laser projection display screen for an ultra-short-focus laser device, and an ultra-short-focus laser projection device having the ultra-short-focus laser projection display screen.

Background technique

The screen size projected by a normal projection device is determined by the distance between the projection device and the projection display screen. The larger the distance, the larger the projected image. The ultra-short-focus laser projection device has a small distance requirement, and often only needs a projection distance of several tens of centimeters to project a larger picture, and is also very convenient to install, and only needs to be placed in front of the projection display screen. It has the advantages of more space saving and convenient installation than ordinary projection equipment.

Specifically, as shown in FIG. 1 , the ultra-short-focus laser projection device emits light from the ultra-short-focus lens 11 and is incident on the projection display screen 12 having a small distance therefrom; this part of the light is projected to project a large screen. The upper and lower angular distribution ranges between 20° and 80°, which requires the projection display screen to accept and effectively process the light at this wide angle of incidence and reflect this light to the viewing area.

The current ultra-short-focus laser projection device, the matching projection display screen uses an optical hard-screen display screen, which is similar to an LCD TV screen or a soft screen when no image is displayed, and is equipped with an ultra-short-focus laser projection device to project under normal ambient light. High brightness and high contrast images. However, such an optical hard screen display screen is large in size, high in cost, and inconvenient to handle and install.

Summary of the invention

The object of the present invention is to provide an ultra-short-focus laser projection display screen and an ultra-short-focus laser projection device, which solves the technical problem that the projection and display screens of the existing ultra-short-focus laser projection equipment are inconvenient to carry and install.

The object of the invention is achieved by the following technical solutions:

An ultra-short-focus laser projection display screen is provided, comprising a reflective layer; Forming an arcuate microprojection unit; each of the microprojection units is sequentially arranged to form an upper semicircular pattern; wherein the microprojection structure receives incidence from the center of the upper semicircle The angle between the cut surface of the light surface and the acute angle of the reflective layer gradually increases, so that light emitted from the ultra-short-focus lens is reflected parallel or nearly parallel after being incident on the reflective layer.

Further, the longitudinal section of the microprojection structural unit is a right triangle; from the center of the upper semicircle, the angle between the oblique side of the plurality of microprojection unit and the reflective layer Gradually increase.

Further, outwardly from the center of the upper semicircular shape, the longitudinal sections of the plurality of microprojection structural units are arcs having the same radius of curvature and a gradient of the arc length.

Further, outwardly from the center of the upper semicircular shape, the longitudinal section of the plurality of microprojection structural units is a semicircle having a gradual curvature radius.

Further, each of the microprojection structural units is composed of a plurality of microprojection structures; the plurality of microprojection structures are sequentially arranged into an arc-shaped microprojection structure unit; each of the microprojection structures The plurality of microprojection structures in the unit are spherical bodies having the same radius of curvature; from the center of the upper semicircular circle, the longitudinal section of the microprojection structure in the plurality of microprojection structural units is curvature An arc with the same radius and a gradient of arc length.

Further, the plurality of microprojection structures in each of the microprojection structural units are hemispheres having the same radius of curvature; outward from the center of the upper semicircular shape, the plurality of microprojection structures The longitudinal section of the microprojection structure in the unit is a semicircle with a gradient of curvature radius.

Further, the ultra short throw projection display screen further includes a diffusion layer; the diffusion layer is attached to the reflective layer.

Further, the reflective layer is made of a material having a haze of less than 50% and a transmittance of more than 85%.

Further, a reflective film is attached to the surface of the microprojection structure.

Further, the reflective film is a metal film.

Further, the micro-bump structure is made of a double-layer material to achieve light turning.

Further, the reflective layer and the diffusion layer are all made of a transparent material to make the ultra-short The focal laser projection shows that the brightness of the light reflected from the screen and the brightness of the incident light is between 0.7 and 1.1.

Further, the thickness of the reflective layer and the diffusion layer are both 0.015 mm and 1.0 mm.

An ultra-short-focus laser projection apparatus is provided, comprising an ultra-short-focus lens and the above-mentioned ultra-short-focus laser projection display screen; the light emitted from the ultra-short-focus lens is incident on the ultra-short-focus laser projection display screen in parallel Or near parallel light reflection.

The technical solution of the embodiment of the present invention has the technical effect or the advantage that the ultra-short-focus laser projection display screen provided by the present invention is composed only of a reflective layer composed of a plurality of micro-protrusion structural units, and each micro-protrusion structural unit It is curved and arranged in order to form an upper semicircular pattern. From the center of the upper semicircle, the angle between the cut surface of the microprojection unit receiving the incident light surface and the acute angle of the reflective layer gradually increases; When the micro-convex structure unit reflects a large-angle range of light emitted from the ultra-short-focus lens, the incident light of a relatively small angle is reflected by the micro-convex structure unit near the center of the circle, and the incident light of a relatively large angle is far away. The center of the micro-convex structure unit reflects, so that the incident light in most of the incident angle range can be reflected in parallel or nearly parallel, so that as much light as possible enters the human eye, so that the projection picture is complete and the brightness loss is small. In the above, the light emitted by the ultra-short-focus lens is incident from the lower side of the projection display screen, and can be flattened by the micro-protrusion structure unit provided by the present invention. Or near parallel reflected ambient light source and the upper sides of the projection constituent unit is reflected to the micro inactive area, it is possible to achieve the effect of suppressing the ambient light, a high contrast can be obtained, thereby improving the experience results. The plurality of micro-protrusion structural units constituting the reflective layer can be arranged on the plane of the wall or the screen by film printing, or can be realized by on-site spraying by using a special spraying tool equipped, whether in the form of a film or a film. The projection display screen generated by the on-site spraying method has the advantages of small size, light weight and convenient transportation for the transportation and after-sale installation of the entire ultra-short-focus laser projection equipment, and the installation plane can be selected at will during installation: wall , paper or curtain can be realized; the projection display screen sprayed on-site using a special spraying tool is easy to operate, and when you want to change the position of the projection display screen, you can use a special spraying tool to select a new flat position for spraying. The invention solves the technical problem that the projection display screen of the existing ultra-short-focus laser projection device is inconvenient to carry and install.

DRAWINGS

1 is a schematic view of an optical path of an ultra-short-focus laser projection;

2 is a schematic diagram of a side structure and an optical path of an ultra-short-focus laser projection display screen according to an embodiment of the present invention;

3 is a schematic front structural view of an ultra-short-focus laser projection display screen according to an embodiment of the present invention;

4 is a schematic diagram of a spraying method of an ultra-short-focus laser projection display screen according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a side structure and an optical path of an ultra-short-focus laser projection display screen according to an embodiment of the present invention; FIG.

6 is a schematic side view and an optical path diagram of another ultra-short-focus laser projection display screen according to an embodiment of the present invention;

FIG. 7 is a schematic diagram showing a side structure and an optical path of another ultra-short-focus laser projection display screen according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a side structure and an optical path of another ultra-short-focus laser projection display screen according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic front structural view of another ultra-short-focus laser projection display screen according to an embodiment of the present invention; FIG.

FIG. 10 is a schematic diagram of an optical path of a transparent micro-protrusion structure according to an embodiment of the present invention; FIG.

FIG. 11 is still another schematic diagram of an optical path of a transparent micro-protrusion structure according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 2, the ultra-short-focus laser projection display screen provided by the embodiment of the present invention includes a reflective layer 31. As shown in FIG. 3, the reflective layer is composed of a plurality of curved micro-protrusion structural units. 302; each micro-convex structural unit is sequentially arranged to form an upper semi-circular pattern as shown in FIG. 3; from the center of the upper semi-circular shape, the micro-protrusion structural unit receives the cut surface 311 and the reflective layer of the incident light surface The acute angle is gradually increased so that light emitted from the ultra-short-focus lens 11 is reflected in parallel or near parallel after being incident on the reflective layer.

Specifically, as shown in FIG. 1 , according to the characteristics of the ultra-short-focus laser projection, since the distance between the lens and the projection display screen is short, the light emitted from the lens needs to be realized in order to be projected onto the entire real screen. The projection of a large angle range, usually, the large angle range is 20°-80°. For a normal projection display screen, when the light of the large angle range is incident, reflection and diffusion occur on the ordinary projection display screen. Small angle incident light, its reflected light and diffused light can be basically received by the user, and for large angle incident light, its reflected light is basically reflected to the ineffective area, the user can not receive these large angle incident light, which will cause The projection picture is not clear or even deformed.

According to the solution provided by the embodiment of the present invention, as shown in FIG. 2, the micro-convex structure unit having the above characteristics reflects the incident light f1 of a relatively small angle when the light of a large angle range emitted from the ultra-short-focus lens is reflected. The exit angle is ∠a1) reflected by the micro-convex structure unit near the center of the circle, and the relatively large-angle incident light f2 (the exit angle is ∠b1) is reflected by the micro-convex structure unit far from the center; in order to achieve all the incidence The light can be reflected in parallel or near parallel so that the user can substantially completely receive the incident light in the large angle range, and the angle between the incident light f1 satisfying the small angle and the reflected light r1 is also small, and the incident light of the large angle is large. The angle between f2 and the reflected light r2 is also large, that is, the incident angle and the reflection angle ∠a2 of the small-angle incident light f1 are required to be small, and the incident angle and the reflection angle ∠b2 of the large-angle incident light f2 are large. Therefore, the micro-convex structure unit that needs to reflect the large-angle incident light receives the acute angle between the cut surface of the incident light and the reflective layer, which is larger than the incident angle of the reflection. The micro-protrusion structure of the light receives the acute angle between the cut surface of the incident light and the reflective layer; and the micro-convex structure unit provided by the present invention satisfies the above requirements and is reflected in parallel or near parallel.

Specifically, the optical path of the incident light f1 of the small angle is analyzed as follows: the angle between the incident angle of the incident light f1 on the cut surface q1 and the angle of reflection is the same as the angle of the f1, and the degree is a1° of ∠a1, in the figure , p1 is the normal plane of the face q1, then

And ∠a3=∠a4, so ∠a5=∠a2, it can be concluded that the angle of ∠a5 is

It can be seen that the angle ∠b4 of the cut surface q2 of the light f2 with a large incident angle and the reflection layer must be greater than ∠a5 so that light incident at all angles can be reflected in parallel.

In the above, it can be seen that the micro-convex structure unit that needs to reflect the large-angle incident light f2 receives the acute angle ∠ b4 of the incident surface and the sharp-angled angle 4 b4 of the reflective layer, which is larger than the micro-convex structure unit that reflects the incident light f1 that receives the incident light. The acute angle of the cut surface q1 and the reflective layer is ∠a5; and the micro-embossed structural unit provided by the present invention is outward from the center of the upper semi-circular shape, and the micro-convex structure unit receives the cut surface 311 of the incident light surface and the sharp angle clip of the reflective layer. The gradual increase of the angle satisfies the above requirements, so that the incident light in a wide range of angles is reflected by the parallel or near parallel light into the observer's line of sight, and further fine-tunes the optical parameters according to the viewing angle requirement, including the radius of curvature, the aspherical parameter and When the refractive index is matched and the angle of the desired viewing is reached, the incident light that is reflected in parallel can be received by the user to the utmost extent, so that the projection picture is complete and the light luminance loss is small; above, the light emitted by the ultra-short-focus lens is projected from the projection. The micro-convex structural elements incident on the lower side of the display screen can be reflected in parallel or near parallel by the present invention, while the upper and both sides of the ambient light source are micro- The convex structural unit is reflected to the ineffective area, and the effect of suppressing ambient light interference can be achieved, and a high contrast can be obtained, thereby improving the experience.

The plurality of micro-protrusion structural units constituting the reflective layer can be arranged on the plane of the wall or the screen by film printing, or can be realized by on-site spraying by using a special spraying tool equipped, whether in the form of a film or a film. Projection display produced by on-site spraying Curtain, for the transportation and after-sale installation of the entire ultra-short-focus laser projection equipment, has the advantages of small size, light weight and easy transportation; during the installation process, the installation plane can be selected at will: wall, paper or curtain can be realized; The projection display screen is sprayed on site using a special spraying tool. As shown in FIG. 4, the spraying tool 42 is printed in the spraying area (ie, the reflective layer area) 31 in the direction of the arrow shown by the head, from left to right/right. To the left, spraying from the bottom and the top/upper and lower, and the nozzle is made according to the material and size of the actual micro-protrusion structure unit, and the spraying tool is provided with a sensing feedback device, which can be based on the feedback signal during the spraying process. The surface flatness detection enables the spraying to achieve the formation of a high flatness micro-protrusion structure; or the coating by a roller brush method; or the use of a micro-protrusion structure unit printing film attached to a wall or a projection body for coating Regardless of the type of spraying, real-time operation is simple and feasible, and when you want to change the position of the projection display screen, you can use special spraying The tool selects a new plane position for spraying, so that the installation of the projection display screen is not limited by the position, which solves the technical problem that the projection display screen of the existing ultra-short-focus laser projection device is inconvenient to install.

When fabricated or sprayed for a transparent material, each microprojection structure corresponds to a lens, and the light needs to be totally reflected from the lens to satisfy the incident light of a large angle range of parallel or near parallel reflection in the embodiment of the present invention. The effect; that is, the light needs to be satisfied from the refractive index from dense to sparse, and when the light reaches a certain angle of incidence, the incident light is reflected back into the incident material. Therefore, in the embodiment of the present invention, the outer layer of the micro-protrusion structure is covered with a material having a refractive index higher than that of the micro-convex structure, so that the incident light ray is totally reflected, wherein n1<n2 (micro-protrusion structure) The refractive index is n1 and the refractive index of the cover layer is n2).

The angle of reflection can be determined by the angle greater than the total reflection; the total reflection angle is set by considering the radius of curvature, height and material of the lens.

The micro-protrusion structure proposed by the present invention will be specifically described below by way of specific embodiments.

As shown in FIG. 5, it is a micro-convex structure unit structure and an optical path diagram. In the In the micro-convex structure unit, the longitudinal section of the micro-protrusion structural unit, that is, the cross-section perpendicular to the wall or the mounting plane direction, is a right-angled triangle, and a plurality of micro-protrusions are arranged in order from the center of the upper semi-circular circle. The angle between the oblique side of the structural unit and the reflective layer is gradually increased, which makes the light emitted from the lens at a relatively small angle from the large angle range of the light emitted from the lens being slightly raised by the inclined edge and the reflective layer. L1 is reflected as parallel or near-parallel light, and light emitted at a relatively large angle is reflected into parallel or near-parallel light by the micro-convex structural unit whose oblique side is larger than L1. The heights of the plurality of micro-convex structural units arranged in sequence may be equal, or may be gradually increased or decreased gradually in a gradual change manner, and the optimal manner of designing the corresponding micro-convex structure according to different projection ratios of the lens is not Limited.

As shown in FIG. 6, it is a micro-convex structure unit structure and an optical path diagram. In the micro-convex structure unit, from the center of the upper semi-circular shape, the longitudinal section of the micro-protrusion structural unit is an arc having the same radius of curvature and a gradient of the arc length, that is, a plurality of micro-protrusions arranged in sequence The height of the structural unit may be equal, or may be gradually increased or gradually decreased in a progressive manner; the outer layer of the microprojection structure is covered with a material having a refractive index higher than that of the microprojection structure, so that the incident light is fully realized. Reflection, where n1 < n2 (the refractive index of the microprojection structure is n1, and the refractive index of the cladding layer is n2). In Fig. 6, from the center of the upper semicircular circle, the height of the micro-protrusion structural unit gradually increases, which means that the arc corresponding to the micro-protrusion structural unit gradually increases, and the angle between the cut surface and the reflective layer gradually increases. Large, which makes the light emitted from a large angle range from the lens, the light emitted from a relatively small angle is reflected into parallel or near-parallel light by the micro-convex structure unit having a small angle between the cut surface and the reflective layer, and is emitted at a relatively large angle. The light is reflected by the micro-convex structure unit having a large angle between the cut surface and the reflective layer into parallel or near-parallel light.

As shown in FIG. 7, it is a micro-convex structure design which is more efficient in suppressing ambient light, which is derived from the structure shown in FIG. 6. The longitudinal section of the micro-protrusion structure is about 1/4 circle, from above. Or the incident light on both sides is refracted or reflected to the ineffective area, which can effectively suppress The effect of ambient light on image quality enhances the contrast and sharpness of the projected image. The outer layer of the microprojection structure is covered with a material having a refractive index higher than that of the microprojection structure, so that the incident light is totally reflected, wherein n1<n2 (the refractive index of the microprojection structure is n1, the cover layer The refractive index is n2).

As shown in FIG. 8, it is a micro-convex structure unit structure and an optical path diagram. In the microprojection structural unit, a longitudinal section of a plurality of sequentially arranged microprojection structural units is a semicircle having a gradient of curvature radius (increased gradually) as shown from the center of the upper semicircular circle. When the radius of curvature is gradually increased, the height of the semicircle is higher, and the radius of curvature is larger, and the angle between the cut surface and the reflective layer is larger, which makes the light emitted from the lens at a relatively small angle in a large angle range of light emitted from the lens The micro-convex structural unit with a small angle between the cut surface and the reflective layer is reflected into parallel or near-parallel light, and the light emitted from the relatively large angle is reflected parallel or nearly parallel by the micro-convex structural unit having a large angle between the cut surface and the reflective layer. Light. The outer layer of the microprojection structure is covered with a material having a refractive index higher than that of the microprojection structure, so that the incident light is totally reflected, wherein n1<n2 (the refractive index of the microprojection structure is n1, the cover layer The refractive index is n2).

As shown in FIG. 9, in the ultra-short-focus laser projection display screen provided by the embodiment of the present invention, each micro-protrusion structure unit 302 is composed of a plurality of micro-protrusion structures 301; the plurality of micro-protrusion structures are sequentially arranged in an arc. Shaped micro-convex structural unit; a plurality of micro-convex structures in each micro-convex structural unit are spherical or hemispherical curved cylinders having the same radius of curvature (similar to FIG. 3); The center of the circle is outward, and the longitudinal section of the micro-protrusion structure in the plurality of micro-protrusion structural units is an arc having the same radius of curvature and a gradient of the arc length. In a preferred manner, the height of the micro-protrusion structural unit gradually increases from the center of the upper semicircular circle, which means that the spherical body corresponding to the micro-protrusion structure in the micro-protrusion structural unit gradually increases, and each The angle between the cut surface of the micro-protrusion structure and the reflective layer is gradually increased, which makes the light emitted from the lens at a relatively small angle from the large-angle range of light emitted from the lens being slightly convex by the angle between the cut surface and the reflective layer. The structure is reflected as parallel or near-parallel light, and the light emitted at a relatively large angle is reflected into parallel or near-parallel light by the micro-convex structure having a large angle between the cut surface and the reflective layer.

In another embodiment of FIG. 9, each of the microprojection structure units 302 is composed of a plurality of microprojection structures 301; the plurality of microprojection structures are sequentially arranged into an arc-shaped microprojection structure unit; each micro The plurality of micro-convex structures in the raised structural unit are hemispherical or hemispherical curved cylinders having the same radius of curvature; outwardly from the center of the upper semicircular, micro-bumps in the plurality of micro-convex structural units The longitudinal section of the structure is a semicircle with a gradient of curvature radius. A preferred manner is that the height of the micro-protrusion structural unit gradually increases from the center of the upper semi-circular shape, which means that the radius of the hemisphere corresponding to the micro-protrusion structure in the micro-convex structure unit gradually increases. Then, the angle between the cut surface of each micro-convex structure and the reflective layer is gradually increased, which makes the light emitted from the lens at a relatively small angle in the large-angle range of light emitted from the lens is slightly convex with a small angle between the cut surface and the reflective layer. The structure is reflected as parallel or near-parallel light, and the light emitted at a relatively large angle is reflected into parallel or near-parallel light by the micro-convex structure having a large angle between the cut surface and the reflective layer.

The above-mentioned micro-protrusion structure is made of different materials or sprayed, and is preferably sprayed with a transparent or translucent material to reflect the effect of the invisible screen.

As shown in Fig. 10 and Fig. 11, it is a structure that can achieve total reflection by using only a single material. The incident light is refracted on the surface of the lens (both curved or planar) and reflected twice inside the lens. After exiting from the lens, microscopically, although the optical path is reflected and reflected, the refracted optical path of the internal light of the lens is removed. From the macroscopic point of view, the actual optical path is reflected after being reflected from the optical path of the lens surface. Parallel or near-parallel exits are the same, and other micro-convex structure designs similar to this effect are within the scope of this patent scheme.

The arrangement density of the above-mentioned micro-convex structural unit is uniformly distributed along a radius of a semicircle or a near semicircle, and of course, it may be gradually increased or gradually decreased in a gradual manner, and the density is densely arranged. It will affect the reflection efficiency of the overall light, but overall, the impact is small.

The ultra-short-focus laser projection display screen provided by the embodiment of the invention further includes a diffusion layer attached to the reflective layer. The diffusion layer is formed by diffusing particles or a colloid doped with powder, has a high transmittance, and emits a certain angle of light after being reflected; in order to minimize the loss of light brightness, it also has a slight diffused light angle. In the embodiment of the present invention, a material having a haze of less than 50% and a transmittance of more than 85% is selected. The diffusion layer may be bonded to the reflective layer by a bonding method in a film manner, or the diffusion particles may be sprayed onto the reflective layer; on the one hand, the diffusion layer can protect the reflective layer, and on the other hand, the diffusion layer functions as a diffusion layer. For small angle divergence of reflected light, the purpose of divergence is to satisfy a larger viewing angle.

The reflective layer and the diffusion layer may be opaque or transparent; when the transparent material is designed, the effect of the invisible screen can be achieved, and in order to reduce the loss of light brightness, it is necessary to control the arrangement of the micro-convex structure on the reflective layer. The light reflected by the ultra-short-focus laser projection display screen and the incident light efficiency loss are minimized, and the ratio of the brightness is between 0.7 and 1.1 through the micro-convex structure design, and the gain of the projection screen is controlled; It means that the ratio of the brightness of the light reflected by the projection display to the human eye and the brightness of the light emitted from the ultra-short lens is less than 1, indicating that the brightness of the light is lost, and greater than 1, indicating that the brightness of the light is increased, and the gain is too small. The picture will be lost or the picture quality will be affected. If the gain is too large, the other indicators of the picture will be lost and the picture quality will be affected. Therefore, it is necessary to consider the ultra-short-focus ratio and the best gain value to obtain a better projection picture.

In order to increase the transmittance of light, in the embodiment of the invention, the anti-reflection film may be attached or sprayed on the incident surface and the exit surface of the diffusion layer of the micro-protrusion structure.

In order to improve the reflectivity of the reflective layer, in the embodiment of the present invention, a reflective film, preferably a metal film, may be sprayed on the surface of the micro-protrusion structure; the film structure may be formed by plating, spraying, and metal silver, aluminum. Or a dielectric layer to achieve.

In the embodiment of the present invention, the reflective layer and the diffusion layer need to control the thickness of the material between 0.015 mm and 1.0 mm during fabrication or spraying to ensure a basic light reflection effect while ensuring less loss of brightness.

Embodiments of the present invention also provide an ultra-short-focus laser projection apparatus including an ultra-short-focus lens and the above-described ultra-short-focus laser projection display screen, and a large-angle range of light emitted from an ultra-short-focus lens is incident on the above After the ultra-short-focus laser projection display screen is reflected into the human eye in parallel or near-parallel light, the light loss is small, the projection picture is complete and the brightness loss is small.

The projection display screen can be transported in advance in the form of a film, or can be transported by means of a spray material and a spray tool, regardless of the manner of transport, compared to the projection display screen used by the existing ultra-short-focus laser projection device, which is small in size. The utility model has the advantages of small weight and convenient transportation; and in the installation of the user's home, if the finished product is formed by film formation, the installation is difficult due to the overall lightness, and if the projection plane is selected by spraying materials and spraying tools, the spraying method is simple and easy. The invention solves the technical problem that the projection display screen of the existing ultra-short-focus laser projection device is inconvenient to carry and install.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Ultra-short-focus laser projection display screen, characterized in that

Including a reflective layer;

The reflective layer is composed of a plurality of curved micro-convex structural units;

Each of the microprojection structural units is sequentially arranged to form an upper semicircular pattern, wherein, from the center of the upper semicircular shape, the microprojection structure receives a section of the incident light surface and the reflective layer The acute angle is gradually increasing.
The ultra-short-focus laser projection display screen according to claim 1, wherein the longitudinal section of the micro-protrusion structure unit is a right-angled triangle; and the plurality of the vertical-arranged circles are arranged in order from the center of the upper semi-circle The angle between the oblique side of the micro-protrusion structural unit and the reflective layer gradually increases.
The ultra-short-focus laser projection display screen according to claim 1, wherein, from the center of the upper semicircular shape, the longitudinal sections of the plurality of microprojection structural units have the same radius of curvature and an arc Long gradient arc.
The ultra-short-focus laser projection display screen according to claim 1, wherein a longitudinal section of the plurality of microprojection structural units is a semicircle having a gradient of curvature radius outward from a center of the upper semicircle.
The ultra-short-focus laser projection display screen according to claim 1, wherein each of said micro-protrusion structural units is composed of a plurality of micro-protrusion structures; said plurality of micro-protrusion structures are sequentially arranged in an arc a shape of the micro-convex structure unit; each of the micro-bump structures in the micro-bump structure unit is a spherical body having the same radius of curvature; from the center of the upper semi-circle, the plurality of The longitudinal section of the microprojection structure in the microprojection structure unit is an arc having the same radius of curvature and a gradient of the arc length.
The ultra-short-focus laser projection display screen according to claim 5, wherein each of the plurality of microprojection structures is a hemisphere having the same radius of curvature; from the upper half a circular center of the circle outward, the plurality of micro-convex structures The longitudinal section of the micro-protrusion structure in the element is a semicircle with a gradient of curvature radius.
The ultra-short-focus laser projection display screen according to claim 1, wherein the ultra-short-throw projection display screen further comprises a diffusion layer; the diffusion layer is attached to the reflective layer.
The ultra-short-focus laser projection display screen according to claim 7, wherein the diffusion layer is made of a material having a haze of less than 50% and a transmittance of more than 85%.
The ultra-short-focus laser projection display screen according to claim 1, wherein a reflective film is attached to a surface of said microprojection structure.
The ultra-short-focus laser projection display screen according to claim 9, wherein the reflective film is a metal film.
The ultra-short-focus laser projection display screen according to claim 1, wherein the micro-protrusion structure is fabricated using a two-layer material to achieve steering of light.
The ultra-short-focus laser projection display screen according to any one of claims 1-8, wherein the reflective layer and the diffusion layer are all made of a transparent material to cause the ultra-short-focus laser projection. The gain of the light reflected from the display screen and the brightness of the incident light is between 0.7 and 1.1.
The ultra-short-focus laser projection display screen according to any one of claims 1-8, wherein the reflective layer and the diffusion layer have a thickness of 0.015 mm to 1.0 mm.
An ultra-short-focus laser projection apparatus comprising: an ultra-short-focus lens and an ultra-short-focus laser projection display screen according to any one of claims 1 to 13; and light incident from the ultra-short-focus lens After the ultra-short-focus laser projection displays the screen, it is reflected by parallel or near-parallel light.