CN219831622U - Orthographic projection screen - Google Patents

Abstract

The front projection screen comprises a substrate layer and an optical microstructure layer, wherein the optical microstructure layer comprises a plurality of prismatic bulges which are arranged in parallel at intervals, the prismatic bulges are arranged along the transverse direction of the projection screen and are provided with a first surface and a second surface, the first surface is provided with a light absorption material, and the second surface is provided with a reflecting material; semi-cylindrical lenses parallel to the ridges are arranged between the ridges, and reflecting materials are arranged on the surfaces of the semi-cylindrical lenses. The light absorbing material arranged on the first surface of the corrugated bulge can absorb the ambient light, so that the interference of the ambient light on a projection picture can be reduced, and the picture contrast can be improved. In addition, the semi-cylindrical lens provided by the utility model can change the reflection direction of projection light, so that the brightness distribution of the projection screen in the height direction is more uniform, and the viewing effect is better. The front projection screen has the characteristics of simple structure, high picture contrast and more uniform brightness.

Description

Orthographic projection screen

[ field of technology ]

The present utility model relates to projection screens, and more particularly to a front projection screen.

[ background Art ]

Projection screens are tools that cooperate with projectors to display images, video screens, etc., and are commonly used in commercial advertising, teaching, office, home or theatre entertainment applications, etc. Projection screens are generally classified into front projection screens and rear projection screens. The front projection screen relies on the reflection principle, and the projection device is placed in front of the projection screen (on the same side as the viewer), and the projection screen reflects the projection light. Rear projection screens rely on the transmission principle, where the projection device is placed on the rear side of the projection screen (on both sides of the projection screen, respectively, with the viewer), and the projection light is transmitted through the projection screen and into the human eye. The front projection screen can be made in any size, but the environment light needs to be controlled to obtain good viewing effect. When the ambient light is stronger, the picture contrast is lower, and the displayed projection picture can be whitened and grey, so that the picture quality is reduced, and the viewing experience is affected. Therefore, for the forward projection, if the interference of the ambient light can be reduced and the contrast of the picture can be improved, the picture quality can be greatly improved and the product competitiveness can be improved.

[ utility model ]

The present utility model is directed to solving the above-mentioned problems, and provides a front projection screen capable of improving the contrast of a picture.

In order to solve the above problems, the present utility model provides a front projection screen, which is characterized in that the front projection screen comprises a substrate layer and an optical microstructure layer, wherein the optical microstructure layer comprises a plurality of parallel and spaced prismatic protrusions, the prismatic protrusions are arranged along the transverse direction of the projection screen, and are provided with a first surface and a second surface, the first surface is provided with a light absorption material, and the second surface is provided with a reflecting material; semi-cylindrical lenses parallel to the ridges are arranged between the ridges, and reflecting materials are arranged on the surfaces of the semi-cylindrical lenses.

Further, the first surface is perpendicular to the substrate layer.

Further, the second surface intersects with the substrate layer and the first surface, respectively.

Further, the arch height of the semi-cylindrical lens is lower than the height of the corrugated bulge.

Further, the light absorbing material is black ink.

Further, the cylindrical surface of the semi-cylindrical lens faces away from the substrate layer.

Further, a transparent protective layer is provided on a side of the optical microstructure layer facing away from the substrate layer.

Further, the surface of the transparent protective layer is frosted.

Further, the substrate layer is a black structure layer.

The present utility model has an advantageous contribution in that it effectively solves the above-mentioned problems. The front projection screen is provided with the optical microstructure layer, the optical microstructure layer is provided with the prismatic bulges, and the first surfaces of the prismatic bulges are provided with the light absorption materials so as to absorb the ambient light, thereby reducing the interference of the ambient light on a projection picture and improving the picture contrast. In addition, the semi-cylindrical lens arranged along the transverse direction is further arranged in the optical microstructure layer, and the surface of the semi-cylindrical lens is provided with a reflecting material, so that the reflecting direction of the projection light can be changed, the light distribution of the projection light in the up-down direction is more diversified, the brightness distribution of the projection screen in the height direction is more uniform, and the viewing effect is better. The front projection screen has the characteristics of simple structure, high picture contrast and more uniform brightness, has strong practicability and is suitable for being widely popularized.

[ description of the drawings ]

Fig. 1 is a cross-sectional view of the present utility model.

Fig. 2 is another cross-sectional view of the present utility model.

Fig. 3 is a schematic structural view of the present utility model.

The attached drawings are identified: a substrate layer 10, an optical microstructure layer 20, a rib-shaped protrusion 21, a first surface 211, a second surface 212, a semi-cylindrical lens 22 and a transparent protective layer 30.

[ 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, 2 and 3, the front projection screen of the present utility model includes a substrate layer 10 and an optical microstructure layer 20. Further, it may further include a transparent protective layer 30.

The substrate layer 10 is used for carrying the optical microstructure layer 20, which is a base structure layer. The material of the substrate layer 10 is not limited, and may be any known material. The substrate layer 10 may be a hard material or a soft material, and may be specifically set as required.

To enhance the interference with ambient light to enhance the contrast of the projected image, the substrate layer 10 is preferably a black structured layer. In normal use, the substrate layer 10 faces away from the viewer, and can absorb the ambient light on the back side of the projection screen, so as to avoid the interference of the ambient light on the back side on the projection screen.

The substrate layer 10 may be a black structure layer, and may be made of a black material as a whole, or may be formed by spraying black ink on a non-black material, so long as it is black and absorbs ambient light on the back side.

As shown in fig. 3, the optical microstructure layer 20 is used for absorbing the ambient light on the front side and changing the reflection direction of the projected light. The optical microstructure layer 20 comprises a number of prismatic protrusions 21 and semi-cylindrical lenses 22.

The ridge-like projections 21 are arranged in the lateral direction of the projection screen, extending from one end in the lateral direction to the other end. The ridges 21 are spaced parallel to each other.

The ridge-like protrusion 21 is provided with a first surface 211 and a second surface 212. The first surface 211 is provided with a light absorbing material for absorbing ambient light. The second surface 212 is provided with a reflective material for reflecting the projection light.

The light absorbing material and the reflecting material can be known materials, wherein the light absorbing material refers to materials with strong light absorbing capacity, such as black ink, paint and the like, and the reflecting material refers to materials with strong reflecting capacity, such as silver paint, pearl paint and the like.

In this embodiment, the first surface 211 is perpendicular to the substrate layer 10, so when the dark light absorbing material is disposed on the first surface 211, the projection area of the dark light absorbing material on the front surface of the projection screen is very small, and the user does not feel that black stripes are formed on the projection screen, so that the influence on the brightness of the projection screen can be reduced as much as possible while the ambient light is absorbed, and the influence on the display effect of the projection screen caused by the dark light absorbing material is avoided.

The second surface 212 is disposed at an angle that may be set according to the relationship of the projection device to the projection screen. In this embodiment, the second surface 212 intersects the substrate layer 10 and the first surface 211. The inclination angle of the second surface 212 of each ridge-like protrusion 21 may be the same or different, and may be specifically set as required.

The semi-cylindrical lenses 22 are arranged between the prismatic protrusions 21, are arranged along the transverse direction of the projection screen, and have two ends flush with two ends of the prismatic protrusions 21. The cylindrical surface of the semi-cylindrical lens 22 faces away from the substrate layer 10. In other words, the semicylindrical lens 22 protrudes in the same direction as the prismatic protrusion 21.

A reflective material for reflecting the projection light is provided on the columnar surface of the semicylindrical lens 22.

To improve the interference immunity of the projection screen to ambient light, the semi-cylindrical lens 22 has a camber lower than the height of the prismatic projection 21. Projection screens are often subject to interference from ambient light, such as sunlight, lights, etc., from above the projection screen when in use. When ambient light is incident on the optical microstructure layer 20, since the height of the first surface 211 is higher than that of the semi-cylindrical lens 22, most of the ambient light can be incident on the light absorbing material on the first surface 211 and absorbed, and a small part of the ambient light can be incident on the second surface 212 below the first surface 211 and the reflective material of the semi-cylindrical lens 22.

The distance between the prismatic protrusion 21 and the semi-cylindrical lens 22 may be set according to needs, and in this embodiment, the distance between the prismatic protrusion 21 and the semi-cylindrical lens 22 is zero, and the two structures are connected to each other.

Because the surface of the optical microstructure layer 20 is uneven, in order to avoid dust deposition, a transparent protective layer 30 may be further disposed on a side of the optical microstructure layer 20 facing away from the substrate layer 10.

The transparent protective layer 30 is made of a transparent material, which is compounded on the surface of the optical microstructure layer 20.

In some embodiments, as shown in fig. 1, the transparent protective layer 30 may be directly compounded on the surface of the optical microstructure layer 20 by a transparent film material, where an air gap is formed between the optical microstructure layer 20 and the transparent protective layer 30. Because the refractive indexes of the air and the transparent protective layer 30 are generally different, the transmission angle of the projection light can be further changed due to the existence of the air gap, so that the light angle is more diversified, thereby being beneficial to improving the visual angle and avoiding the generation of speckles.

In some embodiments, as shown in fig. 2, the transparent protective layer 30 may be formed by filling a transparent material on the surface of the optical microstructure layer 20, which will fill up the surface of the optical microstructure layer 20, so that the surface of the projection screen is more flat and stiff.

Further, the surface of the transparent protective layer 30 is frosted, which is favorable for scattering projection light to improve the viewing angle and avoid glare effect.

Thus, the front projection screen of the present utility model is formed. In use, the substrate layer 10 is positioned on the rear side of the viewing direction away from the projection device, and the transparent protective layer 30 is positioned on the front side of the viewing direction towards the projection device. Projection light from the projection device is directed through the transparent protective layer 30 into the optical microstructured layer 20, which is reflected by the second surface 212 and the reflective material on the semi-cylindrical lens 22 such that the light passes through the transparent protective layer 30 and out toward the viewer, thereby allowing the viewer to view the projected image. Since the prismatic protrusions 21 and the semi-cylindrical lenses 22 are disposed in the lateral direction, it is advantageous to reflect the projection light toward the up-down direction of the projection screen, so that the light amounts of the upper and lower regions of the projection screen are as uniform as possible, thereby avoiding the phenomenon that the central region is bright and the upper and lower regions are dark. When the ambient light above the projection screen passes through the transparent protective layer 30 and reaches the optical microstructure layer 20, the ambient light will be mainly incident on the light absorbing material of the first surface 211, so that the ambient light can be absorbed and can not reach or very little reach the reflective material of the second surface 212 or the semi-cylindrical lens 22, thereby avoiding the interference of the ambient light on the projection light and further improving the contrast of the picture. While ambient light on the back side of the projection screen is blocked and absorbed by the substrate layer 10. The front projection screen has the characteristics of simple structure, high contrast ratio and uniform brightness, and has strong practicability.

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 (9)

1. A front projection screen, characterized in that it comprises a substrate layer (10) and an optical microstructure layer (20), the optical microstructure layer (20) comprises a plurality of parallel and spaced-apart prismatic protrusions (21), the prismatic protrusions (21) are arranged along the transverse direction of the projection screen, and are provided with a first surface (211) and a second surface (212), the first surface (211) is provided with a light absorbing material, and the second surface (212) is provided with a reflecting material; semi-cylindrical lenses (22) parallel to the prismatic protrusions (21) are arranged between the prismatic protrusions, and reflecting materials are arranged on the surfaces of the semi-cylindrical lenses (22).

2. A front projection screen according to claim 1, wherein the first surface (211) is perpendicular to the substrate layer (10).

3. A front projection screen according to claim 1, wherein the second surface (212) intersects the substrate layer (10), the first surface (211), respectively.

4. An orthographic projection screen according to claim 1, characterized in that the height of the semi-cylindrical lens (22) is lower than the height of the prismatic projection (21).

5. The front projection screen of claim 1, wherein the light absorbing material is black ink.

6. The front projection screen according to claim 1, characterized in that the cylindrical surface of the semi-cylindrical lens (22) faces away from the substrate layer (10).

7. A front projection screen according to claim 1, characterized in that a transparent protective layer (30) is provided on the side of the optical microstructure layer (20) facing away from the substrate layer (10).

8. The front projection screen of claim 7, wherein the surface of the transparent protective layer (30) is frosted.

9. A front projection screen according to claim 1, wherein the substrate layer (10) is a black structured layer.