CN217279253U - Projection screen - Google Patents

Abstract

The utility model discloses a projection screen belongs to projection display technical field, and this projection screen is including reducing along the direction of view in proper order projection screen is to the projection light antireflection layer of projection light reflection, sees through in the projection light and the absorption non-projection light with the light filter layer of the different parts of projection light wavelength, microlens structural layer and reflector layer. The projection screen provided by the utility model not only can effectively reduce surface reflection, increase the utilization rate of the projection screen to projection light, improve the display brightness of the projection screen, and reduce the energy consumption of projection display; and other non-imaging light rays except the projection light rays can be absorbed, and the image display contrast and the watching comfort experience of the projection screen are effectively improved.

Description

Projection screen

Technical Field

The utility model relates to a projection display field, concretely relates to projection screen.

Background

Along with the continuous development and growth of the projection market, people tend to be perfect in demand for projection effect, and for the existing projection screen, because projection light is obliquely incident on the projection screen and forms a larger incident angle with the surface of the projection screen, the projection light is reflected on the surface of the projection screen to form a light shadow on the ceiling of a room in a large quantity, so that the projection display brightness is low, the viewing interference is generated on the image displayed by the projection screen, and the viewing comfort level experience is influenced. In addition, the conventional projection screen is often provided with a color layer to absorb light so as to improve the contrast of the screen, but the color layer absorbs not only non-projection light but also part of projection light, so that the light energy of the projection light is also greatly reduced, and the increase of the light energy of the projection light relative to the light energy of the non-projection light is not large, so that the contrast improvement effect on the projection screen is limited. Therefore, the brightness of the projection screen can be increased, the contrast of the projection screen can be better improved, the problem of innovative development of the projection screen is solved, and the large-scale popularization and application of the projection screen are directly influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provides one kind and can increase the demonstration luminance, can improve the contrast again to guarantee to watch the projection screen of comfort level.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

a projection screen sequentially comprises a projection light anti-reflection layer, a light filter layer, a micro-lens structure layer and a reflection layer, wherein the projection light anti-reflection layer is used for reducing the reflection of projection light rays by the projection screen, the light filter layer penetrates through the projection light rays and absorbs parts, different from the projection light rays, of non-projection light rays.

In a preferred option of the embodiment of the present invention, in the projection screen, the projection light antireflection layer is at least one antireflection optical film.

In a preferred option of the embodiment of the present invention, in the projection screen, the antireflection optical film has a polarization function.

In a preferred option of the embodiment of the present invention, in the projection screen, the projection light antireflection layer is at least one layer of concave-convex nano-microstructures.

In a preferred option of the embodiment of the present invention, in the projection screen, the light filtering layer is a light absorbing film layer formed by alternately stacking a plurality of high and low refractive index materials.

In an embodiment of the present invention, in the above projection screen, the light filtering layer is formed by stacking a plurality of light absorbing film layers absorbing light with different wavelengths.

In a preferred option of the embodiment of the present invention, in the above projection screen, the light filtering layer is at least one dye layer having a function of absorbing light of a specific wavelength.

In a preferred option of the embodiment of the present invention, in the above projection screen, the light filtering layer is a photonic crystal layer.

In a preferred option of the embodiment of the present invention, in the above projection screen, the light filtering layer is at least one polarizing film layer, and the polarizing film layer transmits linearly polarized light or circularly polarized light to block other polarized light.

In a preferred option of the embodiment of the present invention, in the above projection screen, the cross section of the microlens structure layer is a zigzag microlens structure array.

The utility model provides a projection screen has following beneficial effect:

by arranging the structures (the projection light anti-reflection layer, the light filtering layer, the micro-lens structure layer and the reflection layer) of the projection screen, the utilization rate of the projection screen to projection light can be increased, the display brightness of the projection screen is improved, and the energy consumption of projection display is further reduced; and other non-imaging light rays except the projection light rays can be absorbed, the image display contrast of the projection screen is effectively improved, and the watching comfort level is ensured.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a projection light antireflection layer of the present invention;

fig. 3 is another schematic structural view of the projection light antireflection layer of the present invention;

FIG. 4 is a schematic diagram of a first structure of a light filtering layer according to an embodiment of the present invention;

FIG. 5 is a second schematic diagram of a light filtering layer according to an embodiment of the present invention;

FIG. 6 is a third schematic diagram of a light filtering layer according to an embodiment of the present invention;

FIG. 7 is a diagram illustrating a fourth structure of a light filtering layer according to an embodiment of the present invention;

fig. 8 is a schematic view of a microlens structure layer according to an embodiment of the present invention.

Wherein, the reference numbers in the figures mean:

1-a projection screen; 11-a projection light anti-reflection layer; 12-a light filtering layer; 13-a microlens structure layer; 14-a reflective layer; 110-an anti-reflective optical film; 111-a concave-convex nano-microstructure; 120-a light absorbing film layer; 1201-a first light absorbing film layer; 1202-a second light absorbing film layer; 121-a dye layer; 1211 — a first dye layer; 1212-a second dye layer; 122-a photonic crystal layer; h-high refractive index material; l-low refractive index material.

With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a projection screen 1 sequentially includes a projection light anti-reflection layer 11, a light filter layer 12, a micro-lens structure layer 13, and a reflection layer 14 along a viewing direction, the projection light anti-reflection layer 11 can reduce reflection of projection light by the projection screen 1, and the light filter layer 12 can transmit the projection light and absorb a portion of non-projection light incident on the projection screen, which is different from a wavelength of the projection light.

As a further supplementary note, as shown in a of fig. 2, the projection light reflection reducing layer 11 is an antireflection optical film 110, and the antireflection optical film 110 may be a film material layer with a lower refractive index relative to other structural layers on the projection screen, such as a low refractive index UV glue organic material cured layer, an electroplated layer or a coated layer of other inorganic materials such as silicon dioxide; or directly attached in the low shaping film sheet of the refracting index on projection screen top layer like acrylic ester film sheet, polyurethane film sheet etc. these materials are because the refracting index is lower than other structural layers of projection screen, consequently when projection light incides the projection light antireflection layer, belong to low refracting index and toward high refractive index incidence, can make projection light refraction entering projection screen structural layer more in, thereby reduce the reflection of light on projection screen surface, reduce the loss of light and to viewer's interference, promote the luminance of screen and viewer's the comfort level of watching and experience.

More preferably, as shown in fig. 2 b, the projection light antireflection layer 11 is a physical layer stack of the multilayer antireflection optical film 110, and through gradual refraction of each layer to the projection light, the incident included angle between the projection light and each structural layer of the projection screen can be further reduced, so as to further reduce the reflection loss of the incident projection light, increase the utilization rate of the projection screen to the projection light, and improve the display brightness of the projection screen. The brightness of the projection screen is increased, and the design brightness of the projector can be reduced under the same watching display brightness, so that the energy consumption of projection display can be reduced.

As a further supplementary note, the antireflection optical film 110 may also be configured as an optical film having a polarization function, such as allowing transmission of linearly polarized projection light or transmission of circularly polarized light, and such an optical film may generally implement the polarization function through coating, so that the antireflection optical film also has a function of selecting light incidence so as to make a part of ambient light not be transmitted, thereby reducing interference of ambient light with the imaging brightness, color and contrast of the projection screen.

As a further supplementary note, as shown in a of fig. 3, the projection light reflection reducing layer 11 may also be a layer of concave-convex nano-microstructures 111, which is similar to a three-dimensional wave shape, each microstructure is formed by connecting approximately smooth curves, and the size of each concave structure and each convex structure in each direction is in the nanometer range, preferably less than 780nm, and more preferably less than 380 nm. These unsmooth nanometer micro-structure 111 are because the size is little and connect the smoothness for projection light does not take place specular reflection after inciding on the structural plane, but in direct refraction gets into the projection screen, consequently can the surperficial reflection of light of effectual reduction projection screen, reduce the loss of light and to watching this interference, promote the luminance of screen and the viewing experience of viewer.

As a further supplementary description, as shown in fig. 3 b, the projection light antireflection layer 11 is more preferably a stack of multiple layers of concave-convex nano microstructures 111, so as to further reduce the reflection loss of the incident projection light, increase the utilization rate of the projection screen for the projection light, improve the display brightness of the projection screen, and reduce the energy consumption of projection display.

To further supplement the description, as shown in fig. 4, the light filter layer 12 is a light absorbing film layer 120, and the light absorbing film layer 120 is formed by alternately laminating a plurality of high refractive index materials H and a plurality of low refractive index materials L. The light absorption film layer 120 can absorb other non-imaging light rays except for the projection light rays, reduce the interference of the non-imaging light rays on the projection screen, and effectively improve the image display contrast of the projection screen.

Further, the high refractive index materials H and the low refractive index materials L of the light absorption film layer 120 may be alternately deposited on the substrate by vacuum coating, and absorption and elimination of the non-imaging light are realized by causing the non-imaging light to generate destructive interference in each material layer. Of course, the light absorbing film layer 120 may also be formed by alternately laminating multiple layers of high refractive index material H and multiple layers of low refractive index material L on the substrate by means of multilayer coating. Other multi-layer material combination methods can also be used to form the light absorbing film layer 120.

More preferably, as shown in fig. 5, the light filtering layer 12 is a light absorbing film layer 120 formed by sequentially and alternately stacking a first light absorbing film layer 1201 and a second light absorbing film layer 1202, and the first light absorbing film layer 1201 and the second light absorbing film layer 1202 absorb light with different wavelengths, for example, the first light absorbing film layer 1201 only absorbs light with a wavelength greater than 700nm, and the second light absorbing film layer 1202 only absorbs light with a wavelength less than 320nm, so that light with a wavelength less than 320nm and a wavelength greater than 700nm can be effectively absorbed and eliminated through the combination of the two light absorbing film layers with different light absorbing effects, thereby eliminating the interference of non-imaging light to the imaging of the projection screen, and effectively improving the image display contrast of the projection screen.

Furthermore, a new light-absorbing film layer 120 can be formed by combining the first, second, third, fourth and more Nth light-absorbing film layers which absorb light rays with different wavelengths, for example, the third light-absorbing film layer only absorbs light rays with a wavelength of 490 nm-510 nm, and the fourth light-absorbing film layer only absorbs light rays with a wavelength of 570 nm-600 nm, so that interference of more non-imaging light rays on a projection image is further eliminated, and the contrast of the projection screen is further improved.

Furthermore, the first, second, third and fourth … … nth light absorption film layers are formed by alternately stacking a plurality of high refractive index materials H and a plurality of low refractive index materials L, and are fabricated as described above.

As a further supplementary note, the light filtering layer 12 is a dye layer having a function of absorbing light with a specific wavelength, for example, the dye layer can absorb visible light with a wavelength greater than 650nm, so as to eliminate interference of non-imaging light to the image formation of the projection screen, and effectively improve the image display contrast of the projection screen.

More preferably, the dye layer may also be configured to absorb non-imaging light having a wavelength less than 350nm and a wavelength greater than 650 nm; the device can also be arranged to absorb other visible light except red light, green light and blue light, thereby effectively eliminating the interference of non-imaging light to the projection screen and improving the image display contrast of the projection screen.

Further, as shown in fig. 6, the light filtering layer 12 is composed of a dye layer 121 formed by stacking a plurality of first dye layers 1211 and second dye layers 1212, which have the function of absorbing light with specific wavelength, for example, the first dye layers 1211 can absorb visible light with a wavelength greater than 650nm, and the second dye layers can absorb ultraviolet light with a wavelength less than 350 nm.

Further, the light filtering layer 12 may also be stacked by a first, a second, a third, a fourth … … nth dye layer having the function of absorbing light of a specific wavelength, for example, the first dye layer absorbs uv light with a wavelength less than 360nm, the second dye layer absorbs light with a wavelength greater than 490nm and less than 510nm, the third dye layer absorbs light with a wavelength greater than 560nm and less than 600nm, and the fourth dye layer absorbs light with a wavelength greater than 650nm … …. Each dye layer can absorb light with a certain specific wavelength in a targeted manner, so that the interference of non-imaging light on screen imaging is adjusted more accurately, and the purpose of improving the contrast is achieved.

As a supplementary description, the light filtering layer may be one or more stacked polarizing film layers, and the polarizing film layer can only transmit linearly polarized light or circularly polarized light, and has a blocking effect on light in other polarization states, so that the polarizing film layer can be matched with the off-axis state of the projection light, so that the projection light can effectively transmit, interference of other light to the projection light is reduced, and the contrast effect of the projection screen is improved.

As a further addition, as shown in FIG. 7, the optical filter layer 12 may also be a photonic crystal layer 122 composed of an artificially designed and fabricated photonic crystal material having a periodic dielectric structure on an optical scale. Similar to the modulation of an electronic wave function by a semiconductor lattice, photonic crystal materials are capable of modulating electromagnetic waves having a corresponding wavelength — the electromagnetic waves are modulated due to the presence of bragg scattering as they propagate in the photonic band gap material, and the electromagnetic wave energy forms a band structure. A band gap, i.e., a photonic band gap, occurs between the energy bands. Photons with energies within the photonic bandgap cannot enter the crystalline material. In short, the photonic crystal material has a wavelength selection function, and can selectively allow light in a certain wavelength band to pass through and prevent light in other wavelengths from passing through, so that the filter layer prevents non-imaging light from passing through and allows projection light to pass through the photonic crystal material, thereby filtering the non-imaging light, effectively eliminating the interference of the non-imaging light on the imaging of the projection screen, and improving the image display contrast of the projection screen.

Further, set up the light filter layer in projection screen's intermediate level, it is right the utility model discloses an important effect has, its effect is after light gets into projection screen inside, non-projection light can be blockked once by the light filter layer at first, after that, reflect back from the reflection stratum on the projection screen back when light, non-projection light is blockked once more by the light filter layer again, and these non-projection light probably still can be a lot of in the screen inside and reflect, the light filter layer can also block these non-projection light many times, consequently, this kind of non-projection light of setting through the light filter layer can be effectively blockked twice at least on projection screen, this is that it all is difficult to obtain this kind of effect of blockking to non-projection light with the light filter layer setting on projection screen's top layer or back.

To further supplement the description, as shown in fig. 8, the microlens structure layer 13 is a microlens structure array with a saw-tooth-shaped cross section. The micro-lens structure array can effectively refract or reflect the projection light passing through the light filtering layer to form an image to a watching area, and can also refract the non-projection light incident on the micro-lens structure array to the outside of the watching area, so that the image brightness of a projection screen is enhanced.

Further, in order to meet the requirements of different viewing scenes for imaging the projection screen, the overall shape of the microlens array may also be a concentric circular arc shape, a parabolic shape, an elliptical arc shape, a linear shape, or other array shapes with the above functions, and by changing the shape of the microlens array, the projection light may be refracted or reflected to the desired viewing area.

Further, a reflective layer 14 is disposed on the microlens structure array of the microlens structure layer 13, and the reflective layer 14 may be attached to the tooth-shaped surface of the microlens structure, or may be formed by attaching a separate layer to the microlens structure layer. The reflective layer 14 can effectively reflect the projected light to the image viewing area, such as aluminum metal, silver, or a stack of silicon dioxide and tantalum pentoxide.

Furthermore, a black light absorption material can be added into the reflecting layer, so that non-projection light is further absorbed, and the contrast of the projection screen is improved.

To sum up, the projection screen of the present invention sequentially sets the projection light anti-reflection layer 11, the light filtering layer 12, the micro-lens structure layer 13 and the reflection layer 14 along the viewing direction, the projection light anti-reflection layer 11 can reduce the reflection of the projection screen 1 to the projection light, increase the utilization rate of the projection screen to the projection light, enhance the display brightness of the projection screen, and further reduce the energy consumption of the projection display; the light filter layer can see through projection light to can absorb incide the part different with projection light wavelength in the non-projection light on the projection screen, can absorb other non-formation of image light except that projection light, the effectual image display contrast who improves the projection screen guarantees the comfort level of watching.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A projection screen is characterized by sequentially comprising a projection light anti-reflection layer, a light filtering layer, a micro-lens structure layer and a reflection layer, wherein the projection light anti-reflection layer is used for reducing the reflection of the projection screen to projection light, the light filtering layer penetrates through the projection light and absorbs the part, different from the wavelength of the projection light, of non-projection light.

2. The projection screen of claim 1 wherein the projection light antireflective layer is at least one antireflection optical film.

3. The projection screen of claim 2 wherein the anti-reflective optical film has a polarizing function.

4. The projection screen of claim 1 wherein the projection light antireflective layer is at least one layer of a concave-convex nano-microstructure.

5. The projection screen of claim 1 wherein the light filter layer is a light absorbing film layer formed by alternately stacking a plurality of high and low refractive index materials.

6. The projection screen of claim 5 wherein the light filter layer is a stack of light absorbing film layers that absorb light of different wavelengths.

7. The projection screen of claim 1 wherein the light filtering layer is at least one dye layer having the function of absorbing light at a specific wavelength.

8. The projection screen of claim 1 wherein the light filtering layer is a photonic crystal layer.

9. A projection screen according to claim 1 wherein the light filtering layer is at least one polarizing film layer that transmits linearly polarized or circularly polarized light and blocks other polarized light.

10. The projection screen of claim 1 wherein the cross-section of the microlens structure layer is a zigzag array of microlens structures.

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