CN216210457U - Optical control layer for inhibiting laser speckle, screen and display device - Google Patents
Optical control layer for inhibiting laser speckle, screen and display device Download PDFInfo
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- CN216210457U CN216210457U CN202122123210.8U CN202122123210U CN216210457U CN 216210457 U CN216210457 U CN 216210457U CN 202122123210 U CN202122123210 U CN 202122123210U CN 216210457 U CN216210457 U CN 216210457U
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Abstract
The utility model discloses an optical control layer, a screen and a display device for inhibiting laser speckles, wherein the screen has a light ray regression reflection characteristic, namely most of light beams incident to the screen return in a direction parallel to an incident optical axis, the light beams return in an ordered mode after being projected onto the screen, scattered light beams are few, the interference effect of the light beams is greatly reduced, the laser speckles floating on an image are effectively inhibited, the image display quality of laser projection is greatly improved, the speckles are reduced to a level acceptable to human eyes, and the viewing comfort level is improved.
Description
Technical Field
The utility model relates to the technical field of projection, in particular to an optical control layer, a screen and a display device for inhibiting laser speckles.
Background
As a novel projection display technology, the market share is promoted year by year in recent years, three-color laser projection is an important new field, the technical development of three-color laser light sources has reached a relatively mature stage, and a projection technology using three-color laser as a light source has the advantages of high brightness, high color gamut, high contrast, simple system and the like. But the high coherence of the laser also brings the speckle problem and seriously affects the image display quality. At present, common methods for inhibiting laser speckle include dynamic scattering sheets, screen vibration, light source vibration, increasing the types of laser wavelengths and the like. Some of the modes have higher cost, some have great implementation difficulty, some have a certain defect that the inhibition effect on the speckles is not good enough, and the problem of the speckles cannot be better solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provides an optical control layer, a screen and a display device for inhibiting laser speckles. Thereby reducing speckle to a level acceptable to the human eye and improving viewing comfort.
The utility model realizes the purpose through the following technical scheme:
an optical control layer for suppressing laser speckle comprises a substrate, and
a plurality of micro-reflection units arranged on the surface of the substrate and/or in the substrate;
the micro-reflection unit is used for performing retro-reflection on incident laser, so that the incident laser passes through the micro-reflection unit, and the generated emergent laser is emitted in parallel to the incident laser.
Further, the micro-reflection unit is transparent in a single color or colorless and transparent.
Further, the micro-reflection unit is arranged on the surface of the substrate or in the substrate in a layered manner or is semi-buried in the substrate.
The light beam is incident on the micro reflection unit and is refracted on an incident surface, the light beam is focused on the inner surface of the other side of the micro reflection unit, and the light beam is subjected to retro-reflection on the surface, so that the light beam is emitted in the direction opposite to the incident light beam.
The light beam enters from one side surface of the triangular prism, is reflected by the other two mutually perpendicular or approximately mutually perpendicular side surfaces and then exits from the incident side surface in the direction opposite to the incident light beam.
The micro-reflection unit is a micro-pyramid prism structure, the micro-pyramid prism is equivalent to a pyramid cut from one corner of a cube, the micro-pyramid prism is provided with three reflection surfaces which form right angles with each other, the bottom surface of the micro-pyramid prism is in an equilateral triangle shape, light beams enter from the bottom surface along any direction, and the light beams are emitted from the bottom surface in a direction opposite to the incident light beams after being sequentially reflected by the three reflection surfaces.
The utility model further provides a screen for inhibiting speckles, which comprises the optical control layer for inhibiting laser speckles and a substrate layer positioned on the back of the optical control layer.
The utility model also provides a display device, which comprises the screen for inhibiting speckles, a single-color laser projector, a double-color laser projector or a three-color laser projector;
the single-color laser projector, the double-color laser projector or the three-color laser projector is provided with a medium-long focal lens or an ultra-short focal lens.
The utility model has the beneficial effects that:
the screen has the light ray regression reflection characteristic, namely most of laser beams incident to the screen are back-roated in the direction parallel to an incident optical axis and then are projected on the screen, little scattered beams are back-roated in an orderly mode, the interference effect of the beams is greatly reduced, laser speckles floating on images are effectively inhibited, the image display quality of laser projection is greatly improved, the speckles are reduced to the level acceptable to human eyes, and the viewing comfort is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the basic structure of a speckle reduction screen with micro-reflective cells having a spherical structure;
FIG. 2 is a schematic diagram of the basic structure of a speckle reduction screen having micro-reflective elements with a microprism structure;
FIG. 3 is a schematic diagram of the light retro-reflection principle of a micro-reflection unit having a spherical structure;
FIG. 4 is a schematic diagram of the light retro-reflection principle of a micro-reflection unit having a micro-prism structure;
FIG. 5 is a schematic diagram of a retro-reflection of a micro-reflective unit having a micro-pyramidal prism structure;
FIG. 6 is a schematic diagram of an application scene of a long-focus three-color laser projection speckle suppression screen;
FIG. 7 is a schematic diagram of an application scene of an ultra-short focus three-color laser projection speckle suppression screen;
FIG. 8 uses a speckle pattern of a non-speckle reduction projection screen;
FIG. 9 uses speckle to suppress the speckle pattern of a projection screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
The utility model provides a screen for inhibiting speckles, which aims to realize the purpose of inhibiting laser speckles, and the screen comprises an optical control layer 1 capable of inhibiting laser speckles and a substrate layer 2 positioned on the back of the optical control layer 1, as shown in figures 1-2.
The optical control layer 1 has the characteristic of laser beam retro-reflection, that is, most of laser beams incident to the optical control layer 1 return in a direction parallel to an incident optical axis, the laser beams return in an ordered mode after being projected onto a screen, scattered laser beams are few, and the interference effect of the laser beams is greatly reduced.
The structure of the optical control layer 1 includes a substrate and micro reflection units, the laser beam retroreflection characteristic of the optical control layer 1 is realized by the micro reflection units, and the micro reflection units are disposed on the substrate surface and/or in the substrate of the optical control layer 1, as shown in fig. 1-2, the micro reflection units may be distributed in the substrate in disorder, or in disorder on the substrate surface, including distributed on the substrate surface in a semi-buried manner (not shown in the figure). Of course, the micro-reflective units may be arranged in an orderly manner (not shown), for example, in a layer shape on the surface of the substrate or in the substrate or semi-embedded in the substrate, if in a layer shape, it should have at least one layer; the micro-reflection units may also be arranged in an ordered array, and the utility model is not limited to the specific arrangement.
The substrate of the light control layer 1 is generally an adhesive, and may be any material that can constrain the micro-reflective elements and has the characteristics of being transparent or colorless and transparent, or other materials that make the micro-reflective elements satisfy the law of refraction, and the utility model is not limited to the specific material.
To enable the micro-reflective unit to retroreflect laser light and suppress speckle. The micro-reflection unit is transparent in a single color or colorless and transparent, and is characterized in that the micro-reflection unit can be ensured to realize the maximum laser retro-reflection efficiency, and scattered laser beams are reduced; the screen using the micro-reflection unit with the characteristics can greatly reduce the interference effect of laser beams and effectively inhibit laser speckles floating on images.
Regarding the size of the micro-reflection unit, the retro-reflection characteristic of the laser beam can be realized in any size theoretically, but in consideration of image quality, the maximum size of the micro-reflection unit in any direction is preferably matched with the resolution of a display image, the image display quality of laser projection can be greatly improved in the size, speckles are reduced to the level acceptable to human eyes, and the viewing comfort level is improved.
The substrate layer 2 is made of PET or any known material that can be used as a substrate.
The implementation principle of the utility model is illustrated by the light regression reflection principle schematic diagrams of several micro-reflection units;
as shown in fig. 3, the light control layer or screen for suppressing laser speckle of the present invention has a spherical micro-reflection unit with a diameter less than 0.5mm and a refractive index of 1.6-2.5, wherein a laser beam is incident on the micro-reflection unit and refracted at an incident surface, which shows an incident angle and a refraction angle, and is focused at an inner surface of the other side of the micro-reflection unit, and is reflected back at the inner surface, so that the laser beam is emitted in a direction opposite to that of the incident laser beam, thereby achieving the purpose of suppressing laser speckle.
As shown in fig. 4, the micro-reflection unit of the optical control layer or the screen for suppressing laser speckle of the present invention is a triangular prism structure, wherein a laser beam enters from one side surface of the triangular prism, and is reflected by the other two mutually perpendicular or nearly mutually perpendicular side surfaces and then exits from the incident side surface in a direction opposite to the incident laser beam, so as to achieve the purpose of suppressing laser speckle.
As shown in fig. 5, the micro-reflection unit of the optical control layer or the screen for suppressing laser speckle of the present invention is a micro-pyramid prism structure, the micro-pyramid prism is equivalent to a pyramid cut from one corner of a cube, the micro-pyramid prism has three reflection surfaces which form right angles with each other, the bottom surface of the micro-pyramid prism is an equilateral triangle, a laser beam enters from the bottom surface along any direction, and after being sequentially reflected by the three reflection surfaces, the laser beam exits from the bottom surface in a direction opposite to the incident laser beam, thereby achieving the purpose of suppressing laser speckle.
Example 2
As shown in fig. 6 to 7, in the display apparatus, the three-color laser projector used in this embodiment is a direct projection type, and the direct projection projectors used are direct projection lenses having a middle-long focal length lens and an ultra-short focal length lens, respectively; the three-color laser beam containing images emitted by the three-color laser projector 10 is projected onto the speckle suppression screen 20, the speckle suppression screen 20 has a speckle suppression structure as shown in the attached drawing 1 or 2, the speckle suppression screen 20 comprises an optical control layer 1 and a substrate layer 2, a micro-reflection unit in the optical control layer 1 is any one of the micro-reflection units shown in the attached drawings 3-5, the maximum thickness of the micro-reflection unit in all directions is 30-40 μm, and the substrate layer is PET. To illustrate the speckle-eliminating effect of the present embodiment, the three-color laser projector 10 is projected onto a non-speckle-suppressed screen, the speckle state of which is shown in fig. 8, and the speckle effect displayed by using the speckle-suppressed screen is significantly improved, as shown in fig. 9.
According to the screen for inhibiting the speckles, the speckle-inhibiting screen is provided with the special microstructure, so that the laser speckles floating on an image can be effectively inhibited, and the image display quality of laser projection is greatly improved; therefore, speckles are reduced to a level acceptable to human eyes, and the watching comfort level is improved; and speckle suppression effect can be conveniently and effectively realized, and great industrial practical value is achieved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the utility model is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. An optical control layer for suppressing laser speckle, comprising a substrate, and
a plurality of micro-reflection units arranged on the surface of the substrate and/or in the substrate;
the micro-reflection unit is used for performing retro-reflection on incident laser, so that the incident laser passes through the micro-reflection unit, and the generated emergent laser is emitted in parallel to the incident laser.
2. The optical control layer for suppressing laser speckle as claimed in claim 1, wherein the micro-reflective elements are transparent or colorless and transparent.
3. The optical control layer for suppressing laser speckle as claimed in claim 1, wherein the micro-reflective unit layer is disposed on or in the substrate or is semi-buried in the substrate.
4. The optical control layer for suppressing laser speckle as claimed in claim 1, wherein the micro-reflective units are spherical structures, and the light beam incident on the micro-reflective units is refracted at the incident surface, and focused at the inner surface of the other side of the micro-reflective units, and is retro-reflected at the surface, so that the light beam is emitted in the opposite direction to the incident light beam.
5. The optical control layer for suppressing laser speckle as claimed in claim 4, wherein the diameter of the micro-reflective unit is less than 0.5mm and the refractive index is 1.6-2.5.
6. The optical control layer for suppressing laser speckle as claimed in claim 1, wherein the micro-reflective unit is a micro-prism structure of a triangular prism shape, and the light beam enters from one side surface of the triangular prism, and is reflected by the other two side surfaces perpendicular or close to perpendicular to each other, and then exits from the incident side surface in a direction opposite to the incident light beam.
7. The optical control layer for suppressing laser speckle as claimed in claim 1, wherein the micro-reflective unit is a micro-pyramid prism structure having three reflective surfaces at right angles to each other, and a bottom surface of the micro-pyramid prism is an equilateral triangle, and the light beam is incident from the bottom surface in any direction, and after being sequentially reflected by the three reflective surfaces, is emitted from the bottom surface in a direction opposite to the incident light beam.
8. A screen for suppressing laser speckle, comprising an optical control layer for suppressing laser speckle as claimed in any one of claims 1 to 7, and a substrate layer disposed on the back of the optical control layer.
9. A display device for suppressing laser speckle, comprising the screen for suppressing laser speckle of claim 8, and
a monochromatic laser projector, a two-color laser projector, or a three-color laser projector.
10. The display device for suppressing laser speckle as claimed in claim 9, wherein the monochromatic, dichroic, or tristimulus laser projector has a medium or ultra-short focal lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122123210.8U CN216210457U (en) | 2021-09-03 | 2021-09-03 | Optical control layer for inhibiting laser speckle, screen and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122123210.8U CN216210457U (en) | 2021-09-03 | 2021-09-03 | Optical control layer for inhibiting laser speckle, screen and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216210457U true CN216210457U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122123210.8U Active CN216210457U (en) | 2021-09-03 | 2021-09-03 | Optical control layer for inhibiting laser speckle, screen and display device |
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| Country | Link |
|---|---|
| CN (1) | CN216210457U (en) |
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2021
- 2021-09-03 CN CN202122123210.8U patent/CN216210457U/en active Active
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