CN114660885B - Speckle-removing laser television screen and preparation method thereof - Google Patents

Speckle-removing laser television screen and preparation method thereof Download PDF

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Publication number
CN114660885B
CN114660885B CN202011533307.XA CN202011533307A CN114660885B CN 114660885 B CN114660885 B CN 114660885B CN 202011533307 A CN202011533307 A CN 202011533307A CN 114660885 B CN114660885 B CN 114660885B
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layer
speckle
light valve
screen
prism
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CN114660885A (en
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李刚
张毅
夏寅
薛永富
陈建文
唐海江
张彦
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Ningbo Exciton Technology Co Ltd
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Ningbo Exciton Technology Co Ltd
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Priority to PCT/CN2021/074286 priority patent/WO2022134267A1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/602—Lenticular screens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention relates to the field of laser televisions, in particular to a speckle-removing laser television screen and a preparation method thereof. The invention provides a speckle-removing laser television screen and a preparation method thereof, which aim to solve the problem of high speckle contrast ratio in the existing laser television display. The screen sequentially comprises a dimming layer, a prism layer and a reflecting layer from top to bottom, wherein the dimming layer comprises a scattering uniform light valve and an upward uniform light valve; the two sides of the scattering uniform light valve are respectively provided with the upward uniform light valve, and the upward uniform light valve forms a positive included angle theta with the horizontal direction of the screen. The laser television screen provided by the invention can meet the requirement that the speckle contrast of R, G, B three colors is reduced to below 4%.

Description

Speckle-removing laser television screen and preparation method thereof
Technical Field
The invention relates to the field of laser televisions, in particular to a laser television screen, and particularly relates to a speckle-removing laser television screen and a preparation method thereof.
Background
The laser television adopts laser as a display light source, is provided with a special optical screen and an acoustic device, and can receive a broadcast television program or an internet television program.
The laser has high intensity, can meet the requirement of a high-brightness display system, has good directivity, can realize high resolution in a scanning display system, has a laser spectrum of a line spectrum line, and has high color resolution and high color saturation. The laser light source has the characteristics of high brightness, good directivity and good monochromaticity, and is the basis for realizing high-fidelity image reproduction.
However, due to the high coherence properties of laser sources, there is a more common problem of display speckle in laser displays. Speckle is a high contrast bright-dark spot pattern of fine size, such as sand, formed in a display due to the high coherence of a laser light source, the severity of which is indicated by the speckle contrast, which is generally the more severe the higher the speckle contrast, and conversely the more slight the speckle. The presence of speckle can greatly affect the image display quality, and serious ocular discomfort can be brought to viewers, thereby damaging health.
The speckle solving method has two general approaches, one approach is to start from the laser source, improve the spectrum width of the laser source and reduce the coherence of the laser source so as to reduce the speckle, the advantage of the method is that the speckle problem can be well solved from the light source, and the disadvantage is that the widening of the spectral line reduces the monochromaticity of the laser source, can not better exert the color display advantage of laser display, and has high cost. Another approach is to start from the display screen, and fully scatter the laser sources in the aspects of surface and space by reasonably designing the screen, so as to reduce interference between the laser sources, reduce speckle contrast and achieve the purpose of improving the image quality.
Disclosure of Invention
The invention provides a speckle-removing laser television screen and a preparation method thereof, which aim to solve the problem of high speckle contrast ratio in the existing laser television display. The laser television screen provided by the invention can meet the requirement that the speckle contrast of R, G, B three colors is reduced to below 4%.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a speckle-removing laser television screen, which includes, in order from top to bottom, a dimming layer, a prism layer, and a reflecting layer. The foregoing technical solutions include examples 1 to 9.
The light modulation layer sequentially comprises a structured resin layer and a high polymer film from top to bottom.
Further, the dimming layer comprises a scattering uniform light valve and an upward uniform light valve; the two sides of the scattering uniform light valve are respectively provided with the upward uniform light valve, and the upward uniform light valve forms a positive included angle theta with the horizontal direction of the screen.
Further, the dimming layer comprises a scattering uniform light valve and an upward uniform light valve; the uniform scattering light valve comprises a rectangular concave lens and a spindle-shaped concave lens, and the spindle-shaped concave lens is arranged on the concave surface of the rectangular concave lens; the upward uniform light valve comprises a semi-cylindrical lens and spherical particles, and the spherical particles are distributed on the surface of the semi-cylindrical lens; the two sides of the rectangular concave lens are respectively provided with the semi-cylindrical lens, and the semi-cylindrical lens forms a positive included angle theta with the horizontal direction of the screen.
Further, the rectangular concave lens is of a light guide structure, and the semi-cylindrical lens is of a light guide structure. The spindle-shaped concave lens is of an astigmatic structure. The spherical particles are of a light splitting structure.
The light modulation layer sequentially comprises a structured resin layer and a high polymer film from top to bottom.
Further, the structured resin layer comprises a scattering uniform light valve and an upward uniform light valve; the two sides of the scattering uniform light valve are respectively provided with the upward uniform light valve, and the upward uniform light valve forms a positive included angle theta with the horizontal direction of the screen.
Further, the structured resin layer comprises a scattering uniform light valve and an upward uniform light valve; the uniform scattering light valve comprises a rectangular concave lens and a spindle-shaped concave lens, and the spindle-shaped concave lens is arranged on the concave surface of the rectangular concave lens; the upward uniform light valve comprises a semi-cylindrical lens and spherical particles, and the spherical particles are distributed on the surface of the semi-cylindrical lens; the two sides of the rectangular concave lens are respectively provided with the semi-cylindrical lens, and the semi-cylindrical lens forms a positive included angle theta with the horizontal direction of the screen.
Further, the prism layer includes a plurality of prism strips (also called prism columns, simply called prisms), and the prism strips are arc-shaped fresnel structures.
The invention also provides a preparation method of the speckle-removing laser television screen, which comprises the following steps:
(1) Preparing a dimming layer: preparing a structured resin layer on one surface of a high polymer film to form a dimming layer;
(2) Preparing a prism layer: preparing a prism layer on the other surface of the polymer film of the dimming layer;
(3) Preparing a reflecting layer: and preparing a reflecting layer on the surface of one side of the prism peak of the prism layer.
In a second aspect, the invention provides a speckle-removing laser television screen, which comprises a bulk light scattering layer, a prism layer and a reflecting layer from top to bottom. The foregoing technical solutions include examples 11 to 19.
The light diffusion layer comprises a plurality of ellipsoids and a plurality of rectangular fiber diffusion connecting units, two ends of one rectangular fiber diffusion connecting unit are respectively connected with two ellipsoids, the long axis of each ellipsoid is parallel to the direction of the broadside of the screen, and the included angle between the rectangular fiber diffusion connecting unit and the straight line of the direction of the broadside of the screen is alpha.
Further, the bulk light scattering layer is of a hollow three-dimensional structure.
Further, the prism layer includes a plurality of prism strips (also called prism columns, simply called prisms), and the prism strips are arc-shaped fresnel structures.
The invention also provides a preparation method of the speckle-removing laser television screen, which comprises the following steps: preparing a re-release base material, manufacturing a bulk diffusion layer on the release surface of the base material, manufacturing a prism layer on the bulk diffusion layer (the hollow three-dimensional structure of the hollow micron level of the bulk diffusion layer cannot leak glue when manufacturing the prism layer), manufacturing a reflecting layer on the surface of one side of the prism peak of the prism layer, and finally stripping the release film to obtain the speckle-removing laser television screen.
In a third aspect, the invention provides a speckle-removing laser television screen, which sequentially comprises a dimming layer, a bulk light scattering layer, a prism layer and a reflecting layer from top to bottom. The foregoing technical solutions include examples 21 to 29.
The light modulation layer is the light modulation layer provided by the invention, and the bulk light scattering layer is the bulk light scattering layer provided by the invention.
Furthermore, the invention provides a speckle-removing laser television screen, which comprises a dimming layer, a bulk light scattering layer, a prism layer and a reflecting layer from top to bottom.
Further, the screen comprises four layers, namely a dimming layer for sufficiently scattering the laser source scanned to the surface of the screen and optimizing the scanning direction from top to bottom, a bulk diffusion layer for further scattering the laser source scattered and optimized by multiple space refraction-reflection, a prism layer for realizing geometric refraction/reflection and shake scattering in a specific direction of the optics scattered by the bulk diffusion layer, and a reflection layer for reflecting the incident laser source.
Further, the light adjusting layer is formed by compounding a structured resin layer and a high polymer film, the light adjusting layer is divided into an upper surface and a lower surface, the upper surface faces the viewer, and the lower surface is the high polymer film. The structured resin layer in the dimming layer is an optical microstructure with specific optical design, the microstructure is directly facing to a viewer, the structured resin layer is formed on one surface of the polymer film, and the other surface of the polymer film is used as the lower surface of the dimming layer to be connected with the optical functional layer at the back of the screen.
Further, the main functions of the dimming layer are to fully scatter the surface of the laser source scanned on the screen and optimize the distribution of the scanning laser source, so that the scanning laser source can be optimized in the effective viewing direction while the contrast of the surface speckle of the laser source on the screen is reduced, and the brightness and uniformity of the picture are improved. In the general laser television display field, the main application sizes are 75, 80, 88, 90, 100, 110, 120, 150, 75-150 inches, and the length of the screen in the horizontal direction is 1.66-3.321 meters, which is very important for the viewing angle experience of a viewer in the horizontal direction of the screen. Because the transmission mode of the laser source of the laser television is a full-screen projection transmission mode from the bottom end of the screen to the top end of the screen, the viewing requirement of a viewer can be met easily in the vertical direction of the screen. The dimming layer provided by the invention can well regulate the incident scanning laser source in the horizontal direction, and simultaneously, carry out optical optimization in the vertical direction of the screen, so that the attenuation of the central brightness of the scanning laser source caused by full surface scattering of the dimming layer is reduced.
Further, the structured resin layer in the dimming layer is a structured optical functional layer formed by a UV light curing resin raw material of an acrylic acid system, the structure comprises two groups of optical adjusting valves, one group is a scattering uniform light valve, and the scattering uniform light valve is arranged along the horizontal direction of the screen and is used for adjusting the light scattering in the horizontal direction of the screen; one group is an upward uniform light valve, the upward uniform light valve forms a positive included angle theta with the horizontal direction of the screen, and the bottom of the upward uniform light valve is connected with the two sides of the scattering uniform light valve.
Further, the molding raw materials of the structured resin layer in the dimming layer consist of main resin, viscosity adjusting resin, photoinitiator, adhesion promoter and chain extender.
Further, the raw materials comprise, by weight, 40-88 parts of main resin, 10-32 parts of viscosity regulating resin, 0.05-5 parts of photoinitiator, 0.05-10 parts of adhesion promoter and 0.001-1 part of chain extender.
Further, the main resin is hyperbranched resin, and the hyperbranched resin is selected from one of a Haibote resin HUP-103, a Sibao organism SeHBP-UV208, a Bolton H40 and a Dissman hybrid HV 2680.
Further, the viscosity regulating resin is an acrylic ester monomer, and the acrylic ester monomer is one selected from isobutyl acrylate, trimethylolpropane triacrylate, methacrylic ester dimethylaminoethyl ester and tert-butylaminoethyl methacrylate.
Further, the photoinitiator is selected from one of a photoinitiator 1173, a photoinitiator 184, or a photoinitiator 907.
Further, the adhesion promoter is selected from one of Digawet 280, bao Feng TEGO-245, de-Qing W-77 or Bayer Additive 3739.
Further, the refractive index of the structured resin layer in the dimming layer is n1.
Further, the refractive index of the polymer film in the light adjusting layer is n2.
Further, the refractive index n1 of the structured resin is smaller than the refractive index n2 of the polymer film.
Further, the material of the polymer film in the light adjusting layer is selected from one of polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyimide (PI), polyamide (PA), polyvinyl chloride (PVC), methyl methacrylate-styrene copolymer (MS) and styrene (PS).
Further, the material of the polymer film in the light adjusting layer is selected from one of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polyvinyl chloride, methyl methacrylate-styrene copolymer and styrene.
Further, the material of the polymer film in the light adjusting layer is selected from one of polycarbonate, polyethylene terephthalate, polyvinyl chloride and methyl methacrylate-styrene copolymer.
Further, the thickness of the polymer film is in the range of 25-650 μm.
Further, the thickness of the polymer film is 50-450 μm.
Further, the thickness of the polymer film is 75-350 μm.
Further, the forward included angle θ of the uniform light valve in the forward included angle θ is (0, 180) with respect to the horizontal direction of the screen.
Further, the preferable range of the forward included angle θ between the upward uniform light valve and the horizontal direction of the screen is (0, 90) and (90, 180).
Further, the preferable range of the forward included angle theta between the upward uniform light valve and the horizontal direction of the screen is 20-45 and 110-165.
Further, the preferred range of the forward direction included angle theta between the upward uniform light valve and the horizontal direction of the screen is 30-40 and 110-130.
Further, the uniform scattering light valve consists of a light guide structure and a light scattering structure, and the light scattering structure is arranged on the upper surface of the light guide structure. The light guide structure is composed of rectangular concave lenses, and the light scattering structure is composed of spindle-shaped concave lenses.
Further, the specific surface area ratio of the light scattering structure to the light guiding structure is in the range of 0.1-1.5:1.
further, the specific surface area ratio of the light scattering structure to the light guiding structure is in the range of 0.3-1:1.
further, the specific surface area ratio of the light scattering structure to the light guiding structure is in the range of 0.5-0.8:1.
further, the rectangular concave lens has a length ranging from 5 to 70 μm, a depth ranging from 1 to 50 μm, and a width ranging from 1 to 30 μm.
Further, the rectangular concave lens has a length ranging from 13 to 40 μm, a depth ranging from 3 to 30 μm, and a width ranging from 5 to 20 μm.
Further, the rectangular concave lens has a length ranging from 16 to 20 μm, a depth ranging from 5 to 18 μm, and a width ranging from 10 to 18 μm.
Further, the spindle-shaped concave lens has a length ranging from 0.03 to 3 μm, a depth ranging from 0.01 to 5 μm, and a width ranging from 0.01 to 3 μm.
Further, the spindle-shaped concave lens has a length ranging from 0.3 to 2 μm, a depth ranging from 0.03 to 3 μm, and a width ranging from 0.06 to 2 μm.
Further, the spindle-shaped concave lens has a length ranging from 0.3 to 1.5 μm, a depth ranging from 0.08 to 1 μm, and a width ranging from 0.5 to 1.5 μm.
Further, the upward uniform light valve is composed of a light guiding structure and a light splitting structure, and the light splitting structure is arranged on the surface of the light guiding structure. The light guiding structure is a semi-cylindrical lens structure, and the light splitting structure is a spherical particle structure.
Further, the length of the light guiding structure is 1-20 μm, the height is 0.01-2 μm, and the width is 0.5-15 μm.
Further, the length of the light guiding structure is 5-15 μm, the height is 0.03-1.5 μm, and the width is 1-10 μm.
Further, the length of the light guiding structure is 8-12 μm, the height is 0.08-1 μm, and the width is 4-8 μm.
Further, the diameter of the spherical particles of the spectroscopic structure is in the range of 0.01-3 μm.
Further, the diameter of the spherical particles of the spectroscopic structure is in the range of 0.1-2 μm.
Further, the spherical particle diameter of the spectroscopic structure is in the range of 0.3 to 1.2 μm.
Further, the bulk diffusion layer is a space diffusion functional layer with a certain thickness and composed of acrylic acid type UV light curing resin, and the bulk diffusion layer is formed by taking certain space points in the bulk diffusion layer as central points which are mutually connected by fiber diffusion units. The fiber dispersing units are arranged at a certain angle along the vertical direction of the screen. In the thickness direction of the bulk diffusion layer, the center points of these fiber diffusion units connected to each other are stacked on each other to form an integral bulk diffusion layer.
Further, the acrylic acid type UV curing resin consists of, by weight, 40-80 parts of a main agent I, 20-90 parts of a main agent II,0.1-3 parts of a photoinitiator and 0.001-0.1 part of carbon black.
Further, the main agent I of the acrylic acid type UV curing resin is selected from one of polyurethane methacrylate, cyclohexyl methacrylate or isooctyl acrylate.
Further, the weight part range of the main agent I is 45-75 parts.
Further, the weight portion of the main agent I is 50-70.
Further, the main agent II of the acrylic acid type UV curing resin is selected from one of N, N-diethyl acrylamide, polyethylene glycol diacrylate, glycidyl methacrylate or ethylene glycol dimercaptoacetate.
Further, the weight part range of the main agent II is 30-80 parts.
Further, the weight part of the main agent II is 45-75 parts.
Further, the acrylic acid type UV curing resin, the photoinitiator is selected from one of 1-hydroxy cyclohexyl phenyl ketone (184) or 2-hydroxy-2-methyl-1-phenyl-1-acetone (1173).
Further, the weight portion of the photoinitiator ranges from 0.3 to 2.5 portions.
Further, the weight portion of the photoinitiator is in the range of 0.8-1.5 parts.
Further, the acrylic UV curable resin, the carbon black is selected from one of N220, N660, or N990.
Further, the weight part of the carbon black is in the range of 0.005-0.05.
Further, the carbon black is present in an amount ranging from 0.008 to 0.05 parts by weight.
Furthermore, the bulk light scattering layer takes some points in the space of the bulk light scattering layer as central points, the central points are ellipsoids, and the ellipsoids are formed by interconnecting fiber scattering units. The fiber dispersing units are arranged at a certain angle along the vertical direction of the screen. In the thickness direction of the bulk astigmatism layer, the central points of these interconnected by the fiber diverging units are stacked on each other to form an integral bulk astigmatism layer, the bulk astigmatism layer having a thickness in the range of 10-400 μm.
Further, the bulk light diffusion layer has a thickness in the range of 50-300 μm.
Further, the bulk light-scattering layer has a thickness in the range of 80 to 200 μm.
Further, the center point is an ellipsoid arranged along the direction of the screen width, the axial diameter of the ellipsoid along the direction of the screen width is 1-100 μm, and the diameter of the ellipsoid perpendicular to the axial direction is 1-50 μm.
Further, the axial diameter of the ellipsoid along the direction of the screen width edge is 20-80 μm, and the diameter of the ellipsoid along the vertical axial direction is 10-40 μm.
Further, the axial diameter of the ellipsoid along the direction of the screen width edge is 40-60 μm, and the diameter of the ellipsoid along the vertical axial direction is 20-30 μm.
Further, the fiber dispersing units of the bulk light dispersing layer are rectangular fiber dispersing units, and the rectangular fiber dispersing units are distributed among the ellipsoids and connect different ellipsoids.
Further, the rectangular shape of the fiber diverging unit connected to the ellipsoid has a length ranging from 10 to 100 μm, a width ranging from 0.1 to 5 μm, and a thickness ranging from 0.001 to 0.1 μm.
Further, the rectangular shape of the fiber diverging unit connected to the ellipsoid has a length ranging from 20 to 80 μm, a width ranging from 0.5 to 3 μm, and a thickness ranging from 0.005 to 0.08 μm.
Further, the rectangular shape of the fiber diverging unit connected to the ellipsoid has a length ranging from 40 to 60 μm, a width ranging from 1 to 2 μm, and a thickness ranging from 0.01 to 0.05 μm.
Further, the included angle alpha between the rectangular fiber divergence connecting unit and the axis of the ellipsoid along the direction of the screen width edge is 0-80 degrees.
Further, the included angle alpha between the rectangular fiber divergence connecting unit and the axis of the ellipsoid along the direction of the screen width edge is 10-60 degrees.
Furthermore, the included angle alpha between the rectangular fiber divergence connecting unit and the axis of the ellipsoid along the direction of the screen width edge is 20-45 degrees.
Furthermore, the structure of the prism layer is an arc-shaped Fresnel structure, the angle design of the Fresnel structure depends on the caliber and the design pitch of the Fresnel, the angle of the Fresnel structure can be generally calculated according to known data, and the angle of the Fresnel structure of the prism layer is designed by adopting a known method, which is different in that in order to reduce the speckle contrast, the invention introduces a prism dithering design into the Fresnel prism to further reduce the speckle contrast.
Further, the jitter on the Fresnel prism of the prism layer is vertical jitter in the direction perpendicular to the peak of the prism, the amplitude range of the jitter is 0.2-10 μm, and the jitter period is 0.5-15 μm.
Further, the amplitude range of the jitter is 1-7 μm, and the jitter period is 2-10 μm.
Further, the amplitude of the jitter is in the range of 3-5 μm and the jitter period is in the range of 4-8 μm.
Further, the thickness of the prism layer is in the range of 30-100 μm. The prism layer includes prisms and a meat thickness. The thickness of the prism layer refers to the total thickness of the prism and the meat thickness.
Further, the thickness of the prism layer is in the range of 35-80 μm.
Further, the prism layer has a thickness ranging from 40 to 60 μm.
Further, the reflecting layer is composed of reflecting units and coating resin, wherein the reflecting units can be generally selected from metal aluminum, nickel and chromium flakes, organic glass and fluorescent powder, and the coating can be generally selected from ultraviolet light curing acrylic resin, single-component polyester resin and a double-component polyurethane resin system.
Further, the thickness of the reflecting layer is in the range of 0.5-50 μm.
Further, the thickness of the reflecting layer is in the range of 1-30 μm.
Further, the thickness of the reflecting layer is in the range of 5-20 μm.
The invention also provides a preparation method of the speckle-removing laser television screen, which comprises the following steps:
(1) Preparing a dimming layer: preparing a structured resin layer on one surface of a high polymer film to form a dimming layer;
(2) Preparing a bulk light diffusion layer: the bulk light scattering layer is prepared on the other surface of the polymer film of the light adjusting layer;
(3) Preparing a prism layer: preparing a prism layer on the bulk light scattering layer; (hollow micron-sized hollow three-dimensional structure of bulk light-scattering layer will not leak glue when making prism layer)
(4) Preparing a reflecting layer: and preparing a reflecting layer on the surface of one side of the prism peak of the prism layer.
Further, the light modulation layer is prepared by one of UV light curing micro-replication, hot press molding micro-replication and screen printing.
Further, when the bulk astigmatism layer is manufactured, one of digital printing, 3D printing and gravure printing is adopted for forming.
Further, the prism layer is formed by a UV light curing micro-replication method.
Further, the reflecting layer is made by one of spray forming and gravure forming.
The speckle-removing laser television screen provided by the invention has the advantages that the scanning laser sources are well distributed to the horizontal upper direction of the screen under the action of the light guide structure and the light guide layer structure in the light adjusting layer, meanwhile, the spindle-shaped and spherical light-scattering light-splitting structures are borne on the light guide structure and the light guide structure, and the light is dispersed by means of the light distribution directions of the light guide structure and the light guide structure, so that the laser sources which are scanned to single points on the screen are uniformly dispersed into surface light sources in the related light distribution areas, the surface interference of the laser sources is reduced, and the surface speckle contrast is reduced.
When the laser source is subjected to the action of the dimming layer, the ellipsoidal body serves as a center, and the ellipsoidal body is formed by interconnecting and stacking the fiber dispersing bodies, the laser can be scattered and refracted at different angles on the ellipsoidal body with different dimensions, meanwhile, after the laser source contacts the fiber dispersing bodies, the laser source can be scattered and refracted at different angles along the horizontal direction of the screen, and the ellipsoidal body with certain thickness can enable the scattering beams of the laser source to be scattered and refracted in different paths for multiple times, so that the optical path difference of the scattering beams of the laser source in space is further increased, the strong and weak interference phenomenon of the laser source is reduced, and the speckle contrast is reduced.
When the laser source reaches the prism layer through the bulk light scattering layer, the dithering design on the Fresnel prism layer further enables the laser sources reaching different positions on the same prism to generate refraction-reflection in different directions, so that the optical path difference between the scattered beams of the laser source is further increased, the coherent interference is weakened, and the speckle contrast is reduced. The speckle contrast of R, G, B three colors of the speckle-free laser television screen provided by the invention can be reduced to below 4%, and the aim of displaying image quality is improved.
Drawings
FIG. 1 is a schematic view of the vertical anatomy of a speckle-removing laser television screen provided by the present invention;
FIG. 2 is a schematic top view of a dimming layer of a speckle-removing laser television screen according to the present invention;
FIG. 3 is a schematic side view of a rectangular concave lens according to the present invention;
FIG. 4 is an enlarged schematic view of two optical valves for the dimming layer of the speckle-removing laser television screen according to the present invention;
FIG. 5 is a schematic side view of a spindle type concave lens according to the present invention;
FIG. 6 is a side view of a round rod lens light guiding structure provided by the present invention;
FIG. 7 is a schematic diagram of a distribution plane of a laser source of a speckle-removing laser television screen according to the present invention after the laser source passes through a dimming layer;
FIG. 8 is a schematic top view of a bulk diffuser layer of a speckle-removing laser television screen according to the present invention;
FIG. 9 is a side view of a rectangular fiber diverging junction unit provided by the present invention;
FIG. 10 is an enlarged schematic diagram of the prism peak jitter of the prism layer of the speckle-removing laser television screen according to the present invention;
FIG. 11 is a schematic top view of a Fresnel prism of the present invention;
FIG. 12 is a schematic view of a speckle plane of a comparative example provided by the present invention;
fig. 13 is a schematic view of speckle pattern of a laser television screen for resolving speckle provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples, which are to be construed as limiting the scope of the invention. Some insubstantial modifications and adaptations may occur to those skilled in the art in light of the foregoing disclosure.
(1) The speckle contrast of the speckle-removing laser television screen provided by the invention adopts an ARTAM-274 KY-C CCD camera manufactured by Shanghai star company to measure the light intensity parameters, and the total pixel number is 1600 multiplied by 1200.
(2) Speckle contrast calculation using the following formula
Figure BDA0002850823570000121
Where C represents speckle contrast, N is the total number of pixels, in is the intensity at each pixel, and I is the average intensity.
Fig. 1 is a schematic view of vertical anatomy of a speckle-removing laser television screen according to the present invention, which is a dimming layer 1, a polymer film layer 2, a bulk light-scattering layer 3, a prism layer 4, and a reflecting layer 5, wherein a laser source enters the screen from the dimming layer in a scanning manner, passes through an optical functional layer (the bulk light-scattering layer 3, the prism layer 4) to reach the reflecting layer 5, is reflected by the reflecting layer 5, is reflected again by the optical functional layer, and passes out from the dimming layer 1 to reach the viewing range of a viewer.
Fig. 2 is a schematic top view of a light modulation layer of a speckle-removing laser television screen provided by the invention, wherein the structured resin layer comprises a scattering uniform light valve and an upward uniform light valve distributed on the surface of a polymer film, the scattering uniform light valve is a light guide structure, and the scattering uniform light valve comprises a rectangular concave lens 6. The upward uniform light valve is distributed at a positive included angle theta with the horizontal direction of the screen, is connected with two sides of the scattering uniform light valve, comprises a round rod lens 7 and is of a light guiding structure.
Fig. 3 is a schematic side view of a rectangular concave lens provided by the invention, which is respectively a length L1, a width W1 and a depth H1.
Fig. 4 is an enlarged schematic diagram of two optical valves of the dimming layer of the speckle-removing laser television screen provided by the invention. And spindle-shaped concave lenses 8 distributed on the rectangular concave lenses 6, wherein the spindle-shaped concave lenses 8 are of an astigmatism structure. Spherical particles 9 distributed on the round rod lens 7, wherein the spherical particles 9 are of a light splitting structure, and the round rod lens 7 forms a positive included angle theta with the horizontal direction of the screen.
Fig. 5 is a schematic side view of the spindle type concave lens provided by the present invention, which is respectively length L2, width W2, and depth H2.
Fig. 6 is a side view of a round rod lens according to the present invention, which is respectively length L3, width W3, and height H3.
FIG. 7 is a schematic diagram of a distribution plane of a laser source of a speckle-removing laser television screen according to the present invention after the laser source passes through a dimming layer; the light distribution is directed upwards by the optical guiding and scattering action of the light modulating layer to form a quasi-semi-elliptical planar light scattering region 10.
FIG. 8 is a schematic side view of a bulk diffuser layer of a speckle-removing laser television screen according to the present invention; the device is characterized by comprising ellipsoids 11 distributed along the direction of the screen width, rectangular fiber divergent connection units 12 connected with the ellipsoids, and included angles alpha between the rectangular fiber divergent connection units and the direction of the screen width. Broadsides refer to the sides on the left and right sides in fig. 8.
Fig. 9 is a side view of a rectangular fiber diverging junction unit provided by the invention, respectively having a length L4, a width W4, and a thickness range H4.
FIG. 10 is an enlarged schematic diagram of the prism peak jitter of the prism layer of the speckle-removing laser television screen according to the present invention; the prism peak 13 of the dither design.
Fig. 11 is a schematic top view of the fresnel prism of the present invention, prism 14.
Fig. 12 is a schematic view of a comparative example of a speckle plane provided by the present invention, the speckle particles being coarse and the contrast being sharp speckle 15.
Fig. 13 is a schematic view of speckle of the laser television screen for resolving speckle provided by the invention, and the speckle particles are fine and uniform, and the contrast ratio is low.
Examples 1 to 9
The invention provides a speckle-removing laser television screen, which sequentially comprises a dimming layer, a prism layer and a reflecting layer from top to bottom. The light modulation layer sequentially comprises a structured resin layer and a high polymer film from top to bottom. The structured resin layer comprises a scattering uniform light valve and an upward uniform light valve; the uniform scattering light valve comprises a rectangular concave lens and a spindle-shaped concave lens, and the spindle-shaped concave lens is arranged on the concave surface of the rectangular concave lens; the upward uniform light valve comprises a semi-cylindrical lens and spherical particles, and the spherical particles are distributed on the surface of the semi-cylindrical lens; the two sides of the rectangular concave lens are respectively provided with the semi-cylindrical lens, and the semi-cylindrical lens forms a positive included angle theta with the horizontal direction of the screen.
The technical parameters are shown in tables 1-1 and 1-2, and the main performance detection data are shown in tables 1-3.
Examples 11 to 19
The invention provides a speckle-removing laser television screen, which sequentially comprises a bulk light scattering layer, a prism layer and a reflecting layer from top to bottom.
The light diffusion layer comprises a plurality of ellipsoids and a plurality of rectangular fiber diffusion connecting units, two ends of one rectangular fiber diffusion connecting unit are respectively connected with two ellipsoids, the long axis of each ellipsoid is parallel to the direction of the broadside of the screen, and the included angle between the rectangular fiber diffusion connecting unit and the straight line of the direction of the broadside of the screen is alpha.
The bulk light scattering layer is of a hollow three-dimensional structure.
Further, the prism layer includes a plurality of prism strips (also called prism columns, simply called prisms), and the prism strips are arc-shaped fresnel structures.
The technical parameters are shown in tables 2-1, 2-2 and 2-3, and the main performance detection data are shown in tables 2-4.
Examples 21 to 29
The invention provides a speckle-removing laser television screen which sequentially comprises a dimming layer, a bulk light scattering layer, a prism layer, a reflecting layer and a reflecting layer from top to bottom.
The light modulation layer was the light modulation layer described in examples 1 to 9, and the bulk light diffusion layer was the bulk light diffusion layer described in examples 11 to 19.
The technical parameters are shown in tables 3-1, 3-2, 3-3 and 3-4, and the main performance detection data are shown in tables 3-5.
Comparative example: the product model was DNP100 "LaserPanel", and the manufacturer was Japanese printing Co., ltd (DNP).
Figure BDA0002850823570000161
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Figure BDA0002850823570000171
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Figure BDA0002850823570000181
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Figure BDA0002850823570000191
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Figure BDA0002850823570000201
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Figure BDA0002850823570000211
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Figure BDA0002850823570000221
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Figure BDA0002850823570000231
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Figure BDA0002850823570000241
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Figure BDA0002850823570000251
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Figure BDA0002850823570000261
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Figure BDA0002850823570000271
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Figure BDA0002850823570000281
TABLE 3-5 results of the primary Performance test of the technical solutions provided in examples 21-29
Figure BDA0002850823570000291
The preferred embodiments of examples 1-9 are 4-9, the most preferred embodiments are examples 7-9, which have lower speckle contrast.
Preferred embodiments of examples 11-19 are examples 14-19, the most preferred examples are examples 17-19, which have lower speckle contrast.
Preferred embodiments among embodiments 21-29 are 24-29, the most preferred embodiments are embodiments 27-29, which have lower speckle contrast.
In particular, examples 27-29 have the lowest speckle contrast.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are intended to be covered by the scope of the appended claims.

Claims (10)

1. The speckle-removing laser television screen is characterized by comprising a dimming layer, a prism layer and a reflecting layer from top to bottom in sequence; the dimming layer comprises a scattering uniform light valve and an upward uniform light valve; the two sides of the scattering uniform light valve are respectively provided with the upward uniform light valve.
2. The speckle-removing laser television screen of claim 1, wherein the dimming layer comprises a structured resin layer and a polymeric film in that order from top to bottom.
3. The speckle-removing laser television screen of claim 1, wherein the upward uniform light valve forms a forward angle θ with the horizontal of the screen.
4. The speckle-removing laser television screen of claim 1, wherein the light-homogenizing valve comprises a rectangular concave lens and a spindle-shaped concave lens, the spindle-shaped concave lens being disposed on a concave surface of the rectangular concave lens; the upward uniform light valve comprises a semi-cylindrical lens and spherical particles, and the spherical particles are distributed on the surface of the semi-cylindrical lens; the two sides of the rectangular concave lens are respectively provided with the semi-cylindrical lens, and the semi-cylindrical lens forms a positive included angle theta with the horizontal direction of the screen.
5. The speckle-free laser television screen of claim 2, wherein the structured resin layer comprises a scatter light valve and an upward light valve; the two sides of the scattering uniform light valve are respectively provided with the upward uniform light valve, and the upward uniform light valve forms a positive included angle theta with the horizontal direction of the screen.
6. The speckle-free laser television screen of claim 2, wherein the structured resin layer comprises a scatter light valve and an upward light valve; the uniform scattering light valve comprises a rectangular concave lens and a spindle-shaped concave lens, and the spindle-shaped concave lens is arranged on the concave surface of the rectangular concave lens; the upward uniform light valve comprises a semi-cylindrical lens and spherical particles, and the spherical particles are distributed on the surface of the semi-cylindrical lens; the two sides of the rectangular concave lens are respectively provided with the semi-cylindrical lens, and the semi-cylindrical lens forms a positive included angle theta with the horizontal direction of the screen.
7. The speckle-removing laser television screen of claim 1, wherein the prism layer comprises a plurality of prism bars, the prism bars being of a circular arc fresnel structure.
8. The speckle-free laser television screen of any one of claims 1-7, wherein the screen comprises, in order from top to bottom, a dimming layer, a bulk light dispersion layer, a prism layer, a reflective layer; the body light scattering layer comprises a plurality of ellipsoids and a plurality of rectangular fiber divergence connecting units, and two ends of each rectangular fiber divergence connecting unit are respectively connected with the two ellipsoids.
9. The speckle-removing laser television screen of claim 8, wherein the major axis of the ellipsoid is parallel to the direction of the broadside of the screen, and the angle between the rectangular fiber-diverging connection unit and the line of the direction of the broadside of the screen is α.
10. A method of manufacturing a speckle-free laser television screen according to claim 8 or 9, characterized in that the method comprises the steps of:
(1) Preparing a dimming layer: preparing a structured resin layer on one surface of a high polymer film to form a dimming layer;
(2) Preparing a bulk light diffusion layer: the bulk light scattering layer is prepared on the other surface of the polymer film of the light adjusting layer;
(3) Preparing a prism layer: preparing a prism layer on the bulk light scattering layer;
(4) Preparing a reflecting layer: and preparing a reflecting layer on the surface of one side of the prism peak of the prism layer.
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