CN219831616U

CN219831616U - Uniform light orthographic projection screen capable of eliminating spots

Info

Publication number: CN219831616U
Application number: CN202321134041.0U
Authority: CN
Inventors: 王朋
Original assignee: Shandong Weiseni Technology Co ltd
Current assignee: Shandong Weiseni Technology Co ltd
Priority date: 2023-05-12
Filing date: 2023-05-12
Publication date: 2023-10-13
Anticipated expiration: 2033-05-12

Abstract

A uniform light orthographic projection screen for eliminating speckles sequentially comprises a speckle suppression layer, a filter layer, an air gap layer, a reflecting layer and a backlight protection layer, wherein scattering particles are mixed in the speckle suppression layer, so that the coherence of projection light can be reduced, and the speckle effect can be weakened; the filter layer is used for filtering ambient light to improve the contrast of the projection picture, and can adjust the luminous flux of the projection light to make the brightness of the projection picture more uniform; the air gap layer is used for prolonging the light path and weakening the speckle effect; the reflecting layer is provided with a plurality of reflecting parts which extend vertically, the reflecting parts are in a groove shape, and the reflecting parts can reflect projection light towards the left side and the right side of the projection screen, so that the distribution of the projection light is changed, and the brightness distribution is more uniform; the backlight protection layer is black and can be used for shielding back ambient light. The spot-eliminating dodging front projection screen has the characteristics of novel structure, practical function, high contrast, spot elimination, wide visible range and high brightness uniformity, and has strong practicability.

Description

Uniform light orthographic projection screen capable of eliminating spots

[ field of technology ]

The utility model relates to a projection screen, in particular to a spot-eliminating dodging 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 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 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 provides a front projection screen with uniform brightness distribution and reduced speckle effect.

In order to solve the problems, the utility model provides a uniform light front projection screen for eliminating speckles, which is characterized by sequentially comprising a speckle suppression layer, a filter layer, an air gap layer, a reflecting layer and a backlight protection layer, wherein the speckle suppression layer is transparent and is mixed with scattering particles; the filter layer is used for filtering the ambient light emitted from the front of the projection screen; the air gap layer is used for prolonging the light path and weakening the speckle effect; the reflecting layer is provided with a plurality of reflecting parts extending vertically, the reflecting parts are in a groove shape, and the reflecting parts can reflect projection light; the backlight protection layer is black and can be used for shielding back ambient light.

Further, the filter layer is a neutral gray filter.

Further, the filter layer is a neutral gray gradient filter with the light flux linearly increasing from the center to the upper and lower sides.

Further, the thickness of the air gap layer is 1000 um-1500 um.

Further, the reflecting portion is in a semi-cylindrical groove shape, and is formed by recessing one side of the air gap layer towards the backlight protection layer.

Further, the particle diameter of the scattering particles in the speckle suppression layer is 10-100nm.

Further, the reflecting parts are spaced from each other by a distance ranging from 30um to 600um.

Further, the depth of the concave of the reflecting part is 30 um-300 um.

The present utility model has an advantageous contribution in that it effectively solves the above-mentioned problems. The speckle-eliminating homogeneous light orthographic projection screen is provided with the speckle suppression layer, and the scattering particles arranged in the speckle suppression layer can improve the light diffusion degree, so that the coherence of projection light can be reduced and the speckle effect can be weakened. In addition, the air gap layer can extend the optical path and also can attenuate speckle to some extent. In addition, the reflecting layer is provided with a reflecting part which extends vertically and can reflect the projection light and reflect the projection light towards the left side and the right side of the projection screen, so that the distribution of the projection light is changed and the brightness distribution is more uniform. In addition, the filter layer can not only filter the ambient light to improve the contrast of the projection picture, but also can be used for adjusting the luminous flux of the projection light in a linear distribution manner, so that the brightness of the projection picture can be more uniform. The speckle-eliminating dodging front projection screen has the characteristics of novel structure, practical function, high contrast, speckle elimination, wide visible range and high brightness uniformity, and has strong practicability and is suitable for great popularization.

[ description of the drawings ]

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

Fig. 2 is a schematic diagram.

The attached drawings are identified: the speckle reduction layer 10, the filter layer 20, the air gap layer 30, the reflection layer 40, the reflection section 41, and the backlight protection layer 50.

[ 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 front projection screen of the present utility model includes, in order, a speckle reduction layer 10, a filter layer 20, an air gap layer 30, a reflection layer 40, and a backlight protection layer 50.

The speckle reduction layer 10 is used to reduce speckle effects and is transparent. The speckle reduction layer 10 has scattering particles mixed therein. The scattering particles can change the transmission direction of light, so that the angles of the light are more diversified, and the coherence of the light is reduced to reduce the speckle effect. The particle size of the scattering particles is in the range of 10-100nm. In specific implementation, the speckle reduction layer 10 is a coating layer, and the speckle reduction layer 10 is formed by doping organic particles in a transparent coating, spraying the organic particles on the filter layer 20, and curing the organic particles.

The filter layer 20 is used to filter ambient light, and is a neutral gray filter. The filter layer 20 has uniform absorption characteristics in the visible light range, can reduce the light quantity and has a light blocking effect, and has no influence on color while blocking light. When the ambient light and the projected light reach the filter layer 20, the ambient light is blocked and filtered out by the neutral gray scale filter, and the projected light is blocked and loses some luminous flux, but since the light intensity of the projected light is far greater than that of the ambient light, the luminous flux lost by the projected light is very small relative to the whole projected light, and the luminous flux lost by the ambient light is very large or even complete of the whole ambient light reaching the filter layer 20, and therefore, after passing through the filter layer 20, the ambient light can be basically filtered out and the projected light is only lost in a very small part. When the ambient light is filtered, the projection light is not disturbed, and the contrast of the projection picture can be greatly improved. The loss of a very small part of the projection light only causes slight change of brightness, so that the visual effect of the whole display appears to be that the contrast ratio of naked eyes is improved.

Further, in order to make the projection screen uniform, the filter layer 20 may be a neutral gray scale gradient filter with a light flux linearly increasing from the center to the upper and lower sides, and the light blocking capability of the middle area is strongest, and the light blocking capability of the upper and lower end edge areas is weakest, so that the brightness of the middle area is slightly reduced after the projection light passes through the filter layer 20, and the brightness of the middle and two ends is more uniform. Although the neutral gray scale filter has strong filtering capability to the ambient light and weak sides, the neutral gray scale filter with proper performance is selected to filter most of the ambient light in the regions with the weakest light blocking capability, so that the ambient light can be basically filtered after passing through the neutral gray scale filter. When the light intensity of the projection light passes through the neutral gray gradient filter, the light flux of the edge position of the light intensity gradient filter is smaller than that of the middle position, so that the light flux distribution of the projection light can be changed, and the brightness of the picture displayed at the middle position and the upper and lower end positions of the projection picture is more uniform.

The reflective layer 40 is used to reflect the projected light, and is made of a material having high reflectivity, such as a bead paint. In order to adjust the reflection angle of the light so that the brightness distribution of the projection screen is more uniform, a reflecting portion 41 extending vertically is provided on the reflecting layer 40. The reflecting portion 41 has a groove shape and reflects the projection light. In this embodiment, the reflecting portion 41 is in a semi-cylindrical groove shape, and is formed by recessing the side of the air gap layer 30 toward the backlight protection layer 50. The reflecting portions 41 are spaced apart from each other by a distance ranging from 30um to 600um. Since the reflective layer 40 is made of a reflective material, the reflective portions 41 reflect the projection light, and the plane portions between the reflective portions 41 reflect the projection light, but the reflection angles are slightly different. The depth of the recess of the reflecting portion 41 is in the range of 30um to 300um. Since the reflecting portion 41 extends vertically as a whole, it is advantageous to reflect the projection light along the left and right sides of the projection screen to enhance the luminous flux of the left and right sides, so that the brightness distribution of the projection screen is more uniform.

The air gap layer 30 is disposed between the filter layer 20 and the reflective layer 40. The filter layer 20 and the reflecting layer 40 are supported by a plurality of supporting structures, so that the filter layer 20 and the reflecting layer 40 are not completely attached to each other, and an air gap layer 30 can be formed between the filter layer 20 and the reflecting layer 40. Alternatively, the air may be introduced between the filter layer 20 and the reflective layer 40 to perform the inflation treatment, or the air gap layer 30 may be formed between the filter layer 20 and the reflective layer 40. The process of forming the air gap layer 30 may refer to the known technology. Since the reflection layer 40 is provided with the groove-shaped reflection portion 41, the hollow in the reflection portion 41 penetrates the air gap layer 30. The air gap layer 30 is beneficial to prolonging the light path, and the refractive index of the air is different from that of the filter layer 20 and the reflective layer 40, so that when the projection light passes through the air gap layer 30, the original transmission route is changed to make the light angle more diversified, thereby weakening the speckle effect to a certain extent. The thickness of the air gap layer 30 is 1000um to 1500um. The thickness of the air gap layer 30 refers to the distance between the surface of the filter layer 20 and the surface of the reflective layer 40, and does not include the depth of the recess of the reflective portion 41.

The backlight protection layer 50 is disposed on the back side of the reflective layer 40, and is used for shielding back ambient light to improve the contrast of the picture. The backlight protection layer 50 is made of materials including, but not limited to, PET material, PVC material, EVA material, PC material, PMMA material, TPU material, etc. The backlight protection layer 50 may be a hard structural layer or a soft structural layer. In this embodiment, the backlight protection layer 50 is preferably made of black PVC.

Thus, the speckle-dissipating, front projection screen of the present utility model is formed. In use, the side of the speckle reduction layer 10 that is facing the viewer is the positive side; the side of the backlight protection layer 50 facing away from the viewer is the back side. The projection light emitted from the projection device enters the reflection layer 40 through the speckle reduction layer 10, the filter layer 20, and the air gap layer 30, and is emitted in the direction of the viewer through reflection by the reflection layer 40, so that the viewer can view the projection screen. Since the speckle suppression layer 10 and the air gap layer 30 are provided, they can reduce the speckle effect. Further, since the filter layer 20 and the reflecting portion 41 extending in the vertical direction are provided, it is possible to adjust the light distribution in the lateral and vertical directions, thereby making the luminance distribution more uniform. Wherein, the filter layer 20 can adjust the brightness distribution of the upper and lower sides and the brightness distribution in the vertical direction; the reflection unit 41 can adjust the luminance distribution on both the left and right sides, that is, the luminance distribution in the lateral direction. The speckle-eliminating homogeneous light orthographic projection screen provided by the utility model not only can weaken the speckle effect, but also can ensure that the brightness distribution is more uniform, and has strong practicability and is suitable for great popularization.

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-dissipating, front projection screen, comprising, in order:

a speckle suppression layer (10) that is transparent and in which scattering particles are mixed;

a filter layer (20) for filtering ambient light incident in front of the projection screen;

an air gap layer (30) for extending the optical path to attenuate the speckle effect;

the reflecting layer (40) is provided with a plurality of reflecting parts (41) extending vertically, the reflecting parts (41) are in groove shapes, and the reflecting parts (41) can reflect projection light;

the backlight protection layer (50) is black and can be used for shielding back ambient light.

2. The speckle-dissipating, front projection screen of claim 1, wherein the filter layer (20) is a neutral gray filter.

3. The speckle-removing, front projection screen of claim 2, wherein the filter layer (20) is a neutral gray scale graded filter having a light flux that increases linearly from the center to the top and bottom.

4. The speckle-dissipating, front projection screen of claim 1, wherein the air gap layer (30) has a thickness of 1000um to 1500um.

5. The speckle-free front projection screen of claim 1, wherein the reflective portion (41) is in the shape of a semi-cylindrical groove formed by recessing the side of the air gap layer (30) toward the backlight protective layer (50).

6. The speckle-free, homogeneous front projection screen of claim 1, wherein the scattering particles in the speckle reduction layer (10) have a particle size of 10-100nm.

7. The speckle-free, front projection screen of claim 1, wherein the reflective portions (41) are spaced apart from each other by a distance in the range of 30um to 600um.

8. The speckle-free, front projection screen of claim 1, wherein the reflective portion (41) is recessed to a depth of 30um to 300um.