Projection screen (options)

FIELD: physics.

SUBSTANCE: projection screen contains successively placed layers as follows: transparent layer composed of microlens array, light-reflecting layer, basis, i.e. light-absorbing layer, which is sandwiched between said transparent layer and light-reflecting layer, and array of transparent windows in said light-absorbing layer that are positioned opposite to microlenses and filled with diffusion medium. Radius of microlenses, RL, meets the following condition: r0s〉RL〉r0а, where r0а is the coherence radius of ambient light, and r0s is the coherence radius of projected light. Microlenses are made capable to focus more coherent projected light to said windows in the form of spots with sizes equal to that of windows, and less coherent ambient light is focused to said light-absorbing layer and windows in the form of spots with sizes much bigger than that of windows. The light-absorbing layer is made capable to absorb major portion of the ambient light, while transparent windows are made capable to pass the projected light and minor portion of the ambient light to the reflecting coating, which is made capable to reflect the projected light back to windows.

EFFECT: new type of projection screen.

11 cl, 5 dwg

 

The invention relates to the field of optics, and more particularly to projection screens, reflective type, and can be used to render the image generated by the projector.

Conventional projection screen reflective type consists of a diffusion layer, the absorbing layer, the reflective layer and the substrate. Diffusion layer usually consists of dispersed particles in the polymer layer and diffuses the light, increasing the angle. To increase the viewing angle is also used arrays of microlenses. As absorbing layers use black film or polarizing plate. Projection screens are divided into wavelength-selective and polarization-selective and screens with angular selectivity.

In the published application for the European patent EP-A2-0421809 [1] described projection screen consisting of several layers, located on the background of the light-absorbing film, each layer reflects light of a certain color and transmits light of another color. Thus, it is possible to increase the contrast between the incident projected light and the extraneous light, thereby improving the brightness of the image. However, this projection screen has a relatively complicated structure due to the large number of layers, which increases the cost of manufacture. Moreover, tako the projection screen has a strong dependence on the viewing angle due to the narrow beam of the reflected radiation, i.e. the image quality strongly depends on the angle from which you look at the screen.

In U.S. patent US 6597501 [2] proposed a projection screen that allows you to get a better contrast between the projected light and the extraneous light. The screen consists of the absorbing layer and the active layer located on the front side of the absorbing layer. The active layer is transparent to light with one polarization and reflects light with the other polarization. Reflecting polarizing layer can be located between the active layer and an absorbing layer. The disadvantage of this invention is the low efficiency of use of light, and, as a consequence, in the low brightness of the image. Low light utilization efficiency due to the fact that the polarizing layer reflects only light with a specific polarization, i.e. half of the incident light is absorbed in the absorbing layer.

Closest to the claimed invention is the Japan patent JP 6059341 [3], which describes the projection screen of the reflective type, consisting of an array of microlenses, the diffusion layer, the reflective layer, the material of the fibers and the absorbing layer. The disadvantage of this screen is that it cannot achieve the desired contrast between the incident projected light and the extraneous light, and hence the contrast of the image, due to the fact that the crane does not allow to separate the extraneous light, falling within the angle of view from the projected light.

Objective of the claimed invention is to provide a simple, cheap projection screen with enhanced brightness and contrast of the image.

The problem is solved by creating a projection screen, which has consistently placed a translucent layer consisting of an array of microlenses, a reflective layer, and a light absorbing layer that is located between the translucent and reflective layers, and located in the light-absorbing layer, an array of transparent Windows, which are opposite the microlenses and filled the diffusion medium and the radius of the microlenses RLsatiseswhereis the radius of the coherency of the ambient light andthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light on a window in the form of spots, the size of which is equal to the size of the Windows, and less coherent ambient light on the light-absorbing layer and the window in the form of spots, the size of which is considerably greater than the size of the window, with the light-absorbing layer configured to absorb the majority of the ambient light, and window transparency with possibility p is lowering the projected light and the small part of the surrounding light on the reflective coating, which is performed with the possibility of reflection of the projected light back to the window.

For the functioning of the screen it is important that the light-absorbing layer was made flat.

For the functioning of the screen it is important that the microlenses were located close to each other.

The problem is solved by creating a projection screen, which has consistently placed a translucent layer consisting of an array of microlenses, a reflective layer, a base, a light absorbing layer that is located between the translucent and reflective layers and has a relief in the shape of pyramids, an array of transparent Windows located in the light-absorbing layer on the tops of the pyramids in front of the microlenses and filled the diffusion material, and a diffusion layer located between the light-absorbing and reflecting layers, and the side diffusion layer light-absorbing layer coated with reflective material, while the radius of the microlenses RLsatiseswhereis the radius of the coherency of the ambient light andthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light on a window in the form of spots, the size of which Rawa is the size of the Windows, and less coherent ambient light on the light-absorbing layer and the window in the form of spots, the size of which is considerably greater than the size of the window, with the light-absorbing layer configured to absorb the majority of the ambient light, and window transparency with transmittance of the projected light and the lower part of the light diffusion layer, which is arranged to reduce the degree of coherence of light and scattering it on the reflective layer configured to reflect light reflective coating on the light-absorbing layer, which is arranged to reflect light at the window.

The problem is solved by creating a projection screen, which has consistently placed a translucent layer consisting of an array of microlenses, a base, a light absorbing layer, and an array of convex reflecting mirrors located at the base of svetopropusknaya layer opposite the microlenses, and the radius of the microlenses RLsatiseswhereis the radius of the coherency of the ambient light andthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light to the mirrors in Aten, the size of which is equal to the size of the mirrors, and less coherent ambient light to the mirrors and the light-absorbing layer in the form of spots, the size of which is considerably greater than the size of the mirrors, while the light-absorbing layer configured to absorb the majority of the ambient light, and mirrors with reflection of the projected light and the lower part of the light back to the microlenses.

For the functioning of the screen it is important that a translucent layer consisting of an array of microlenses, was performed bilaterally.

For the functioning of the screen it is important that the surface profile of the microlenses was selected from a set of profiles, including parabolic, spherical, aspheric profiles.

For the functioning of the screen it is important to form the base of the microlenses was selected from a set of shapes, including cylindrical, square, rectangular, hexagonal and triangular shape.

For the functioning of the screen it is important to form the base of the microlenses coincided with the shape of a window.

For the functioning of the screen it is important to form the base of the microlenses coincided with the shape of the mirrors.

For the functioning of the screen it is important that it additionally contained a protective transparent layer located above the translucent layer.

The technical result of the claimed izobretatelyam to simplify the design and cost reduction, as well as to increase the brightness and contrast of the image by applying a simple design, which enables them to effectively separate the incident projected light from outside (ambient) light for all angles, including the sector of angles, due to the use of the effect of coherent selectivity, that is, differences in the degree of coherence of the projected and ambient light.

For a better understanding of the present invention the following is a detailed description with the appropriate drawings.

Figure 1. Diagram of the first variant projection screen made according to the invention.

Figure 2. Scheme of the second variant projection screen made according to the invention.

Figure 3. Diagram of a third variant projection screen made according to the invention.

Figure 4. Diagram of the projection screen with a protective layer made according to the invention.

Figure 5. Scheme microlens projection screen made according to the invention.

In the first embodiment, the projection screen has consistently placed a translucent layer 1 (Figure 1), consisting of an array 2 of microlenses, a reflective layer 3, a base 4, and a light absorbing layer 5, which is located between the translucent and reflective layers 1, 3, and located in the light-absorbing layer 5 array 6 transparent the con, which are opposite the microlenses 2 and filled with a diffusion material. Moreover, the light-absorbing layer 5 is made flat, and the microlenses are arranged closely to each other, forming an array 2.

Projection screen made according to the second variant of the claimed invention, contains consistently placed on the translucent layer 1 (Figure 2), consisting of an array 2 of microlenses, a reflective layer 3, a base 4, a light absorbing layer 5, which is located between the translucent and reflective layers 1, 3 and has a relief in the shape of pyramids, as well as an array of 6 transparent window located in the light-absorbing layer 5 on the tops of the pyramids, located opposite the microlenses array 2 and filled with a diffusive material, and a diffusion layer 7 located between the light-absorbing and reflecting layers 5, 3. On the side diffusion layer 7 light-absorbing layer 5 is covered with a reflective material 8.

In the third embodiment, the projection screen includes consistently placed on the translucent layer 1 (Figure 3)consisting of an array 2 of microlenses, the base 4, the light-absorbing layer 5, and an array of 9 reflective convex mirror located at the base of layer 1 opposite the microlenses array 2.

The projection screen may further comprise a protective transparent layer 10 (4) what the hell translucent layer 1.

The principle stated projection screen is as follows: screen provides spatial separation of the incident projected light and ambient stray light with the subsequent reflection of the projected light and the absorption of ambient light. Spatial separation is based on the effect of coherent selectivity, which is manifested by focusing two light beams with different degrees of spatial coherence, when a more coherent beam of projected light is focused by the microlenses stronger than a beam of ambient light with less coherence, and subsequent passage of the focused beam of projected light through a transparent window 6 (the reflection of the focused beam of light from mirrors 9) and the absorption of a beam of ambient light light-absorbing layer 3. The size of the focused spot ambient lightto the size of the focused spot of the projected lightis determined by the expressionwhere a0is the radius of the common light beam (projected and ambient), falling on one microlensis the radius of the coherence of external light andthe coherence radius of the projected light.

DL the occurrence of the above-described effect of coherent selectivity and the proper functioning of the claimed screen should have the following prerequisites: radius R Lmicrolens (Figure 5) must be greater than the radiusthe coherency of the ambient light, but less than the radiuscoherence of the projected light.

An estimate of the radius of coherence of direct sunlight, i.e. the ambient light, shows that the coherence radius is equal to ˜20μm. Diffuse cloud of sunlight on a cloudy day is the coherence radius of the order of the wavelength, i.e. it is less than 1μm. The radius of coherence of the incident projected light on the screen surface, located at a distance of z=1500mm from the light source (projector), equal. For these values of the radii of coherence and the beam radius of the order of the pixel size (a0˜ 1mm) the ratio of the size of the spots focused beams of ambient and projected light. This means that only a small portion of the ambient light will pass through the window 6 the size of the focused spot of the projected light or reflected from the mirror surface 9 of the same size.

Let us consider in more detail the principle of operation of each of the options above stated projection screen.

In the first embodiment, the projected light from the projector and the light from postion the x sources are translucent layer 1 (Figure 1), consisting of an array 2 of microlenses. The microlenses focus more coherent projected light on a window 6 in the form of spots, the size ofwhich is the size of w0Windows 6, and the less coherent the surrounding light on the light-absorbing layer 5 and box 6 in the form of spots, the size ofwhich is much larger than w0Windows 6. The light-absorbing layer 5 absorbs the most part fallen on him the ambient light. Box 6 transparency miss the projected light and a smaller part of the surrounding light on the reflecting layer 3. A reflective layer 3 reflects the light back to the window 6. Light passes through the window 6, a translucent layer 1, and exits the screen, with the diffusion environment inside Windows 6 increases the angle of divergence and reduces the degree of coherence of the reflected light.

In the second embodiment, the projected light from the projector and ambient light from extraneous sources are translucent layer 1 (Figure 2), consisting of an array 2 of microlenses. The microlenses focus more coherent projected light on a window 6 in the form of spots, the size ofwhich is the size of w0Windows 6, and the less coherent the surrounding light on the light-absorbing layer 5 and box 6 in the form of spots, the size ofwhich is much larger than w0Windows 6. Svetog amausi layer 5 absorbs the most part fallen on him the ambient light. Box 6 transparency miss the projected light and a smaller part of the ambient light in the diffusion layer 7. Diffusion layer 7 reduces the degree of coherence of light and scatters it on the reflective layer 3, which reflects the light in the window 6 and the reflecting coating 8 light-absorbing layer 5, which in turn directs the light to the window 6. After passing the 6 and svetopropusknaya layer 1, the light comes out of the screen. This screen has a wider viewing angle compared to other options due to multiple reflections of light between the reflective layer 3 and the reflecting coating 8.

In the third embodiment, the projected light from the projector and ambient light from extraneous sources are translucent layer 1 (Figure 3)consisting of an array 2 of microlenses. The microlenses focus more coherent projection light on the mirror 9 in the form of spots, the size ofwhich is the size of w0mirrors 9 and less coherent ambient light on the light-absorbing layer 5, located behind the transparent base 4, and the mirror 9 in the form of spots, the size ofwhich is much larger than w0mirrors 9. The light-absorbing layer 5 absorbs most ambient light and mirror 9 reflects the projected light and a smaller part of the ambient light back to the array 2 of microlenses sweep the lowering of the layer 1. After passing svetopropusknaya layer 1, the light comes out of the screen. This screen differs from previous versions by using reflecting mirrors instead of Windows transparency for the Department of the projected light from the external light. For manufacturing such a screen can be applied to cheaper technology.

A translucent layer 1 consisting of an array 2 of microlenses may be implemented bilaterally to reduce the focal length and the thickness of the screen.

Optical efficiency of the claimed screen can be improved by optimizing the surface profile of the microlenses (parabolic, spherical, aspherical, and so on), forms the base of the microlenses (cylindrical, square, rectangular, hexagonal, triangular, etc), the size of the microlenses, material, etc. And in the stated embodiments, projection screen form the base of the microlenses does not necessarily coincide with the shape of the Windows 6 and mirrors 9.

The 2 arrays of microlenses with rectangular bases are preferred due to differences in screen sizes in horizontal and vertical directions.

The claimed invention can be used in projection display systems, in various devices for reproduction of the image on the screen, etc.

Although the above embodiment of the invention was and is false for the purpose of illustrating the present invention, professionals it is clear that various modifications, additions and substitutions, without departing from the scope and meaning of the present invention disclosed in the accompanying claims.

1. Projection screen containing consistently placed on the translucent layer consisting of an array of microlenses, a reflective layer, and a light absorbing layer that is located between the translucent and reflective layers, and located in the light-absorbing layer, an array of transparent Windows, which are opposite the microlenses and filled the diffusion medium and the radius of the microlenses RLsatiseswhere r0ais the radius of the coherency of the ambient light; and r0sthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light on a window in the form of spots, the size of which is equal to the size of the Windows, and less coherent ambient light on the light-absorbing layer and the window in the form of spots, the size of which is considerably greater than the size of the window, with the light-absorbing layer configured to absorb the majority of the ambient light, and window transparency with transmittance of the projected light and the small part of the surrounding light on the reflective coating, is AutoRAE configured to reflect the projected light back to the window.

2. Projection screen according to claim 1, characterized in that the light-absorbing layer is made flat.

3. Projection screen according to claim 1, wherein the microlenses are located close to each other.

4. Projection screen containing consistently placed on the translucent layer consisting of an array of microlenses, a reflective layer, a base, a light absorbing layer that is located between the translucent and reflective layers and has a relief in the shape of pyramids, an array of transparent Windows located in the light-absorbing layer on the tops of the pyramids in front of the microlenses and filled the diffusion material, and a diffusion layer located between the light-absorbing and reflecting layers, and the side diffusion layer light-absorbing layer coated with reflective material, while the radius of the microlenses RLsatiseswhere ra0is the radius of the coherency of the ambient light; and r0sthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light on a window in the form of spots, the size of which is equal to the size of the Windows, and less coherent ambient light on the light-absorbing layer and the window in the form of spots, the size of which is considerably greater than the size of the window,with the light-absorbing layer configured to absorb the majority of the ambient light, and transparency with transmittance of the projected light and the lower part of the light diffusion layer, which is arranged to reduce the degree of coherence of light and scattering it on the reflective layer configured to reflect light reflective coating on the light-absorbing layer, which is arranged to reflect light at the window.

5. Projection screen containing consistently placed on the translucent layer consisting of an array of microlenses, a base, a light absorbing layer, and an array of convex reflecting mirrors located at the base of svetopropusknaya layer opposite the microlenses, and the radius of the microlenses RLsatiseswhere r0ais the radius of the coherency of the ambient light, and r0sthe coherence radius of the projected light, while the microlens is arranged to focus more coherent projection light to the mirrors in the form of spots, the size of which is equal to the size of the mirrors, and less coherent ambient light to the mirrors and the light-absorbing layer in the form of spots, the size of which is considerably greater than the size of the mirrors, while the light-absorbing layer configured to absorb the majority of the ambient light, and mirrors with possibly the TEW reflection of the projected light and the lower part of the light back to the microlenses.

6. Projection screen according to any one of claims 1, 4, 5, characterized in that the translucent layer consisting of an array of microlenses made two-way.

7. Projection screen according to any one of claims 1, 4, 5, characterized in that the surface profile of the microlenses is selected from a set of profiles, including parabolic, spherical, aspheric profiles.

8. Projection screen according to any one of claims 1, 4, 5, characterized in that the shape of the base of the microlenses is selected from a set of shapes, including cylindrical, square, rectangular, hexagonal and triangular shape.

9. The projection screen of claim 8, characterized in that the shape of the base of the microlenses coincides with the shape of a window.

10. The projection screen of claim 8, characterized in that the shape of the base of the microlenses coincides with the shape of the mirrors.

11. Projection screen according to any one of claims 1, 4, 5, characterized in that it further comprises a transparent protective layer, located above the translucent layer.



 

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