CN214122676U - Optical orthographic projection screen - Google Patents

Abstract

An optical orthographic projection screen sequentially comprises a scattering layer, a grating layer, an isolation layer, a filter layer, a reflection array, a substrate light penetration layer and a substrate light supplement layer. The grating layer is provided with a grating which can shield and absorb the ambient light from the front upper part of the projection screen, so that most of the ambient light is effectively filtered; and the small part of the ambient light which is not filtered and absorbed by the grating layer can be further filtered by the filter layer, so that the interference of the ambient light to the projection light is greatly reduced, the projection image is basically not influenced by the ambient light, and the contrast of the projection image is greatly improved. The scattering layer and the isolation layer can inhibit speckles, reduce speckle effect and improve display effect. The reflective array can reflect projection light in all directions, so that the visual angle can be greatly increased. The substrate light supplement layer can be used for supplementing light so as to improve the brightness. The utility model discloses a screen is just throwing to anti-light has the characteristics of hi-lite, high contrast, wide visual angle, anti-dazzle, and it has very strong practicality.

Description

Optical orthographic projection screen

[ technical field ] A method for producing a semiconductor device

The utility model relates to a projection screen, in particular to can resist ambient light and improve anti light of picture contrast and throw the curtain just.

[ background of the invention ]

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 theater entertainment, etc. Projection screens are generally classified into front projection screens and rear projection screens. The front projection screen relies on the principle of reflection, 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. The rear projection screen relies on the principle of transmission, the projection device is placed on the back side of the projection screen (on both sides of the projection screen with the viewer), and the projected light is transmitted through the projection screen and enters human eyes. The front projection screen can be made into any size, but the environment light needs to be controlled to obtain a good viewing effect. When the ambient light is stronger, the picture contrast is lower, and the presented projection picture becomes white and grey, so that the picture quality is reduced, and the viewing experience is influenced. Therefore, for the forward projection screen, if the interference of the ambient light can be reduced and the picture contrast can be improved, the picture quality can be greatly improved and the product competitiveness can be improved.

In addition, the conventional projection screen often generates an interference phenomenon, and at an observation angle of human eyes, a speckle phenomenon, which is a spot of bright and dark flicker, is formed in a projection picture, and the observation effect is also affected to a certain extent.

[ Utility model ] content

The utility model aims at solving the above problems, and provides a curtain is just throwing to anti light that can filter ambient light, improve the picture contrast to can resist speckle.

In order to solve the above problems, the present invention provides an optical front projection screen, which is characterized in that the screen sequentially comprises a scattering layer, a grating layer, an isolation layer, a filter layer, a reflective array, a substrate light penetration layer, and a substrate light compensation layer, wherein the scattering layer is used for preventing glare and enlarging a viewing angle; a plurality of micro gratings which are distributed at intervals and used for resisting ambient light and improving the contrast are arranged in the grating layer; the isolation layer is used for prolonging the light path to resist speckles; the filter layer is used for filtering ambient light to improve contrast; the reflecting array comprises a plurality of reflecting particles distributed in an array; the substrate light-permeable layer is used for reflecting array light-permeable transition; the substrate light supplementing layer is used for reflecting the penetrating light into the reflecting array to supplement light.

Further, the filter layer is a gray mirror.

Furthermore, the micro gratings are strip-shaped and distributed along the transverse direction, and the micro gratings are uniformly spaced.

Further, the micro-gratings are made of black ink, and a light-transmitting area is arranged between the micro-gratings and made of transparent materials.

Further, the reflective particles are spherical, and the surface of the reflective particles can reflect the projection light.

Further, the diameter of the reflective particles is less than 15um, and the spacing between the reflective particles is less than 5 um.

Further, the basement light infiltration layer includes that a plurality of radiuses are 0.5um ~ 5 um's infiltration particle, the infiltration particle is globular to be transparent.

Further, the osmotic microparticles are made of vinyl acetate.

Further, the substrate light-compensating layer is black glass fiber.

Further, a protective layer is arranged on the back side of the substrate light supplementing layer.

The beneficial contributions of the utility model reside in that, it has effectively solved above-mentioned problem. The utility model discloses an anti light is just throwing the curtain and is equipped with grating layer and filter layer, wherein the miniature grating in the grating layer can shelter from the absorption to the ambient light that comes from projection screen front top, thereby effectively filter most ambient light, and the small part ambient light that is not filtered the absorption by the grating layer then can further be filtered by the filter layer and filter, thereby the interference of very big reduction ambient light to the projection light, make the projection image not basically receive the influence of ambient light, and then improve the contrast of projection picture greatly, guarantee the display effect of projection picture. Furthermore, the utility model discloses still be equipped with scattering layer and isolation layer, it still can restrain the speckle, weakens speckle effect and improves display effect. On the other hand, the utility model discloses still be equipped with reflect array, it can carry out all-round reflection to the projection light, therefore can increase visual angle greatly. The utility model discloses a curtain is just throwing to anti light not only can effective filtration and restrain the ambient light, can weaken the speckle moreover to enlarge visual angle, it has the characteristics of hi-lite, high contrast, wide visual angle, anti-dazzle, and its display effect is outstanding, and it has very strong practicality.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the principle of light resistance.

Fig. 3 is a schematic diagram of the principle of anti-speckle.

The attached drawings are as follows: the light-transmitting substrate comprises a scattering layer 10, a grating layer 20, a grating 21, a light-transmitting region 22, an isolation layer 30, a filter layer 40, a reflection array 50, a substrate light-transmitting layer 60, a substrate light-compensating layer 70 and a protective layer 80.

[ detailed description ] embodiments

The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.

The utility model discloses a curtain is just throwing to anti light includes scattering layer 10, grating layer 20, isolation layer 30, filter layer 40, reflect array 50, basement light infiltration layer 60, basement light supplement layer 70 and protective layer 80 in proper order.

As shown in fig. 1 and 2, the scattering layer 10 is located at the outermost side of the projection screen, and in use, it directly faces to the user, and it is used to diffuse the projection light to various angles, so that the user can view the projection picture from various angles conveniently. In addition, it can prevent glare and avoid dazzling. The scattering layer 10 is provided therein with a plurality of scattering particles having a scattering effect on the projection light. The scattering particles may be made of a known material and have a particle size of 50um to 100 um. In this embodiment, the scattering layer 10 may be made of a PET material.

As shown in fig. 1 and fig. 2, the grating layer 20 is used for blocking and absorbing ambient light, and filtering most of the ambient light, so that most of the ambient light cannot enter the next layer of structure, thereby reducing the influence of the ambient light on the projection light. The grating layer 20 is provided with a plurality of micro gratings 21 distributed at intervals. The micro-grating 21 is made of black material, is in a strip shape, is distributed along the transverse direction of the projection screen, and extends from one end of the projection screen to the other end along the transverse direction. The micro-gratings 21 are uniformly spaced, and the spacing distance therebetween can be set according to the requirement. In this embodiment, the cross section of the micro grating 21 is rectangular, and is perpendicular to the scattering layer 10 and the isolation layer 30. Between each micro-grating 21 is a light-transmitting region 22, which allows light to pass through. The light-transmitting region 22 is made of a transparent material, for example, resin or the like. When the ambient light enters from the front upper side of the projection screen and enters the grating layer 20, most of the ambient light will reach the micro grating 21 and be shielded and absorbed by the micro grating 21, and the projection light emitted by the projection apparatus mainly enters the rear structural layer through the transparent region 22.

As shown in fig. 1 and 3, the isolation layer 30 is used to reduce the formation of speckle, and is an air gap layer, i.e., a hollow layer. The thickness of the isolation layer 30 is 1000 um-1500 um, and in this embodiment, 1500um is preferred. The isolation layer 30 can isolate the grating layer 20 from the filter layer 40, increase the spacing distance between the grating layer 20 and the filter layer 40, and prolong the light path to reduce the speckle of the projection screen. When the thickness of isolation layer 30 is 1000um, the speckle contrast of projection screen obviously weakens, and when the thickness of isolation layer 30 was 1500um, the speckle contrast weakens the effect most obviously, and improvement effect is best.

As shown in fig. 1 and 2, the filter layer 40 is used to filter ambient light and functions to selectively filter and fuse the light beams from the projection device from a particular direction. In this embodiment, the filter layer 40 is a gray mirror, which has a uniform absorption characteristic in the visible light range, and has a light blocking effect by reducing the amount of light passing therethrough, and has no influence on the color while blocking light. When most of the ambient light passes through the grating layer 20 and is absorbed by the micro-grating 21, a small portion of the unabsorbed ambient light passes through the light-transmitting region 22 together with the projection light to reach the filter layer 40. Under the action of the filter layer 40, the ambient light is blocked and filtered, the projection light is also blocked and some light flux is lost, but because the light intensity of the projection light is much greater than that of the ambient light, the light flux lost by the projection light is a little part relative to the whole projection light, and the light flux lost by the ambient light is a great part or even all relative to the whole ambient light reaching the filter layer 40, so after passing through the filter layer 40, the ambient light is basically filtered, and the projection light is only a little part lost. After the ambient light is filtered, the projection light cannot be interfered, and the contrast of a projection picture is greatly improved; and a part of the light flux loss of the projection light is very little, and only slight change of the brightness is influenced, so that the visual effect presented by the whole is that the contrast of the picture visible by naked eyes is improved.

As shown in fig. 1 and 2, the reflective array 50 is used for reflecting projection light in all directions, which can greatly increase the viewing angle. The reflective array 50 includes tens of millions of spherical reflective particles distributed in an array. The diameter of the reflective particles is less than 15um, and the distance between the reflective particles is less than 5 um. The surface of the reflective particles has a reflective capability, and when the projection light passes through the filter layer 40 and then enters the reflective array 50, the reflective particles in the reflective array 50 can reflect the incident projection light in all directions, so that the viewing angle can be greatly increased. In this embodiment, approximately ten million reflective particles are disposed per square meter.

When the projection light enters the reflective array 50, most of the projection light is reflected back toward the viewer by the reflective particles, and a small portion of the projection light permeates into the next layer of structure through the gaps between the reflective particles, and the projection light permeating into the next layer through the reflective array 50 is called as a permeated light. The base light-permeable layer 60 is used for the light-permeable transition of the reflective array 50 and includes a plurality of permeable particles with a particle size of 0.5um to 5 um. The infiltration particles are spherical and transparent. In the embodiment, the permeating particles are made of vinyl acetate, and the permeating particles have good tension, so that the permeating light can be well transited.

As shown in fig. 1 and 2, the substrate light-compensating layer 70 is used to re-reflect the penetrating light back to the reflective array 50, so that the light is reflected toward the viewer by the reflective array 50. The substrate light supplement layer 70 can reflect light, and has a light supplement function. In this embodiment, the substrate light-compensating layer 70 is a pure black glass fiber, and has a smooth surface with a mirror effect, so that the substrate light-compensating layer can reflect projection light; and black can isolate the ambient light on the back side, so that a 'dark field in a cinema' effect is created, and the interference of the ambient light is suppressed while the reflection function is realized.

As shown in fig. 1 and 2, the protective layer 80 is used to protect the projection screen, and is combined with the substrate light-compensating layer 70, so that the substrate light-compensating layer 70 can be prevented from being damaged, and the flatness of the projection screen can be ensured. The protective layer 80 may be made of PET.

Therefore, the anti-light positive projection screen of the present invention is formed, which sequentially comprises a scattering layer 10, a grating layer 20, an isolation layer 30, a filter layer 40, a reflective array 50, a substrate light penetration layer 60, a substrate light compensation layer 70 and a protection layer 80. Wherein, the side where the scattering layer 10 is located is the side that is viewed by the viewer, namely the front side; the side on which the backlight layer is located is the side facing away from the viewer, i.e. the back side.

The utility model discloses an anti light principle of curtain is just throwing to anti light as follows:

when the projection device is used, as shown in fig. 2, the projection device is disposed in front of the projection screen, and when the projection light emitted from the projection device is incident on the projection screen, the projection light sequentially passes through the scattering layer 10, the light-transmitting region 22 in the grating layer 20, the isolation layer 30, and the filter layer 40 and is incident on the reflection array 50, and after the light is reflected in all directions by the reflective particles, most of the projection light is reflected back toward the viewer, so that the projection light is incident on human eyes, and the user can view the projection image. A small part of the projection light passes through the reflective array 50 and enters the substrate light-permeable layer 60, and reaches the substrate light-compensating layer 70 through the transition of the substrate light-permeable layer 60, and the substrate light-compensating layer 70 reflects the light back to the reflective array 50 again, and reflects the light back toward the audience after being reflected in all directions by the reflective particles. Since the reflective array 50 can reflect light in all directions, the viewing angle can be greatly increased. Since the base light-compensating layer 70 can reflect the penetrating light back to the reflective array 50, high brightness can be secured without loss of the projected light.

As shown in fig. 2, ambient light, such as lamp light, is typically injected from an obliquely upward direction above the projection device. When the ambient light passes through the scattering layer 10 and enters the grating layer 20, it will be incident on the micro-grating 21 and be shielded and absorbed, so that most of the ambient light cannot reach the next layer structure; the ambient light which is not shielded and absorbed by the micro grating 21 passes through the light-transmitting area 22 of the grating layer 20 and then reaches the filter layer 40 after passing through the isolation layer 30, and the ambient light is filtered (namely blocked) by the filter layer 40, so that the ambient light is basically filtered and cannot be incident into the reflection array 50 as the projection light, the interference of the ambient light such as sunlight and lamplight to projection imaging can be greatly reduced, the contrast of a projection picture is improved, and the display effect is improved. In addition, the substrate light-compensating layer 70 is black, and the ambient light at the rear side of the projection screen is shielded by the substrate light-compensating layer 70, so that the interference of the ambient light on projection imaging can be further reduced, and the display effect of the projection picture is further improved.

The utility model discloses a screen is just throwing to anti light weakens speckle principle as follows:

as shown in fig. 3, a projection light beam O emitted by the projection apparatus is incident from the scattering layer 10, the incident light beam O is diffused by the scattering particles in the scattering layer 10, the light beams 1 and 3 are marginal light beams of the diffused light beam, the light beam 2 is a principal light beam, all the light beams in the light beam are distributed between the light beams 1 and 3, and other light beams are not shown in the figure. After passing through the scattering layer 10, the light enters the reflective array 50 through the transparent region 22 of the grating layer 20, the isolation layer 30, and the filter layer 40. The light ray 1 reflected back by the reflective array 50 is the light ray 1 ', the light ray 2 reflected back by the reflective array 50 is the light ray 2 ', the light ray 3 reflected back by the reflective array 50 is the light ray 3 ', and the area of the reflective light covering the scattering layer 10 is shown by the shaded portion: the overlapping regions between the scattering layer 10 and the light 1 ', 3'. When the isolation layer 30 is not disposed, the light reflected back is the light a, the light reflected back is the light b, and the area of the light reflected back covering the scattering layer 10 is the overlapping area between the scattering layer 10 and the light a, the light b. It is obvious that the light reflected back covers more area of the scattering layer 10 after the isolation layer 30 is provided, and thus, the light can cover more scattering particles after the isolation layer 30 is provided than when the isolation layer 30 is not provided. According to the principle of speckle suppression through weakening spatial coherence, the more coherent cells are, the smaller the speckle contrast is; each scattering particle in the scattering layer 10 can be regarded as a coherent element, so that the more scattering particles covered by the light beam, the more coherent elements are included, the smaller the speckle contrast is, and therefore, the speckle can be effectively suppressed. In addition, from another perspective, as the more scattering particles covered by the light beam, the phase difference between the light rays becomes random rather than constant, and thus the interference of the light can be weakened, and the more scattering particles can make the light rays propagate more diversified, make the light propagation direction more diversified, and then also make the speckle effect weakened.

The utility model discloses a screen is just throwing to anti light can effective filtration and restrain the ambient light, makes the projection picture not influenced by ambient light, and in addition, it still can reduce the speckle effect, and it can improve the contrast and the display effect of projection picture. The utility model discloses a screen is just throwing to anti light has the performance of hi-lite, high contrast, anti ambient light, anti-dazzle, wide visual angle (perpendicular 178, control 178 degrees).

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the invention.

Claims (10)

1. An optical orthographic projection screen, comprising in order:

a scattering layer (10) for preventing glare and enlarging a viewing angle;

the grating layer (20) is internally provided with a plurality of micro gratings (21) which are distributed at intervals and used for resisting ambient light and improving the contrast;

an isolation layer (30) for lengthening the optical path to resist speckle;

a filter layer (40) for filtering ambient light to improve contrast;

a reflective array (50) comprising a plurality of reflective particles distributed in an array;

a base light-permeable layer (60) for the reflective array (50) to permeate the light transition;

a base fill-in layer (70) for reflecting the permeated light into the reflective array (50) for fill-in.

2. The optical front projection screen of claim 1, wherein the filter layer (40) is a gray mirror.

3. An optical front projection screen according to claim 1, characterized in that the micro-gratings (21) are in the form of stripes distributed in the transverse direction, the micro-gratings (21) being evenly spaced.

4. An optical front projection screen according to claim 3, characterized in that the micro-gratings (21) are made of black ink, and between the micro-gratings (21) are light-transmitting areas (22) made of a transparent material.

5. The optical front projection screen of claim 1, wherein the reflective particles are spherical and have a surface that reflects the projected light.

6. The optical front projection screen of claim 5, wherein the reflective particles have a diameter of less than 15um and the reflective particles are spaced less than 5um apart.

7. The optical front projection screen of claim 1, wherein the base light-permeable layer (60) comprises a plurality of permeable particles having a radius of 0.5um to 5um, the permeable particles being spherical and transparent.

8. The optical front projection screen of claim 7, wherein the penetrating particles are made of vinyl acetate.

9. The optical front projection screen of claim 1, wherein the base light-compensating layer (70) is black glass fiber.

10. Optical front projection screen according to claim 1, characterized in that a protective layer (80) is provided on the back side of the base light-compensating layer (70).

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