CN112198571A - Light diffusion structure and light diffusion piece - Google Patents
Light diffusion structure and light diffusion piece Download PDFInfo
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- CN112198571A CN112198571A CN202011099628.3A CN202011099628A CN112198571A CN 112198571 A CN112198571 A CN 112198571A CN 202011099628 A CN202011099628 A CN 202011099628A CN 112198571 A CN112198571 A CN 112198571A
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- 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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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Abstract
The invention provides a light diffusion structure and a light diffusion sheet, and relates to an optical element. The light diffusion structure comprises a plurality of cylindrical micro lenses which are transversely arranged, the height-width ratio of the cylindrical micro lenses is gradually reduced from one side to the other side along the vertical direction of the light diffusion structure, and the height-width ratio of the cylindrical micro lenses is equal to the height/width of the cylindrical micro lenses. The light diffusion sheet comprises a base material and the light diffusion structure manufactured on the base material. The light diffusion structure of the invention enables the light intensity close to the light source position to be more distributed to the position far away from the light source position, the brightness close to the light source position is reduced, and the brightness far away from the light source position is increased, so that the brightness close to the light source position is close to or the same as the brightness far away from the light source position, the uniformity of the display brightness of the light diffusion structure is greatly improved, and the uniform effect of the display brightness of the light diffusion sheet is further improved.
Description
Technical Field
The present invention relates to an optical element, and more particularly, to a light diffusion structure and a light diffusion sheet.
Background
The existing light diffusion structure is mainly applied to the fields of projection display, naked eye 3D, illumination and the like, for example, in the field of projection display, the light diffusion structure is used as a key component of a projection screen which is one of projection display core components, and light rays of a projector are diffused by arranging columnar lenses which are vertically connected and arranged and have the same size in the projection screen.
The domestic patent application publication No. CN107102508A discloses a lenticular lens with the same size for enlarging the viewing angle of a projection screen, and as shown in fig. 1, the principle that the lenticular lenses with the same size and vertically arranged in a connected manner have the same horizontal diffusion capability at each position on the projection screen is utilized to realize the redistribution of the light intensity in the horizontal direction. However, the distribution of the light intensity emitted by the projector at each position on the projection screen shows the phenomenon that the middle part is stronger than the two side parts, that is, the light intensity distribution emitted by the projector is different at each position, the loss of the projection light rays incident at different angles at each position of the projection screen is also different, and the light rays are converged by the optical microstructures on the projection screen, so that the distribution of the light intensity on the projection screen is inconsistent.
Therefore, it is desirable to provide a new light diffusion structure to solve the above technical problems.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a light diffusion structure, which solves the problem of non-uniform display brightness caused by non-uniform light diffusion due to non-uniform light intensity distribution of a light source in the conventional light diffusion structure.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a light diffusion structure comprises a plurality of columnar microlenses which are transversely arranged, wherein the height-width ratio of the columnar microlenses is gradually reduced from one side to the other side along the vertical direction of the light diffusion structure, and the height-width ratio of the columnar microlenses is equal to the height of the columnar microlenses/the width of the columnar microlenses.
As an optional mode, the cross section of the cylindrical microlens in the vertical direction of the light diffusion structure is in a shape formed by connecting at least three line segments end to end, or in a shape formed by connecting at least two curves end to end, or in a shape formed by connecting at least one line segment and at least one curve end to end.
Alternatively, the height of the plurality of cylindrical microlenses arranged along the vertical direction of the light diffusion structure is gradually reduced, and the width of the plurality of cylindrical microlenses is constant.
Alternatively, the height of the plurality of cylindrical microlenses arranged along the vertical direction of the light diffusion structure is gradually reduced, and the width of the plurality of cylindrical microlenses is gradually increased.
Alternatively, the height of the plurality of pillar-shaped microlenses arranged along the vertical direction of the light diffusion structure is gradually reduced, the width of the plurality of pillar-shaped microlenses is gradually reduced, and the height reduction of the plurality of pillar-shaped microlenses is greater than the width reduction.
Alternatively, the heights of the plurality of cylindrical microlenses arranged in the vertical direction of the light diffusion structure are the same, and the widths of the plurality of cylindrical microlenses are gradually increased.
As an alternative, diffusion particles are disposed within the cylindrical microlenses.
Alternatively, the columnar microlenses are provided with a light-absorbing material therein.
Alternatively, the surface of the columnar microlens is provided with a resin material that fills the columnar microlens, the resin material having a refractive index different from that of the columnar microlens.
Based on the light diffusion structure, the invention also provides a light diffusion sheet, which enables the light intensity close to the light source position to be more distributed to the position far away from the light source position, the brightness close to the light source position is reduced, the brightness far away from the light source position is increased, and therefore, the brightness close to the light source position is close to or the same as the brightness far away from the light source position, and a good display brightness uniformity effect is obtained.
A light diffusion sheet comprises a base material and the light diffusion structure manufactured on the base material.
The invention has the following beneficial effects:
the light diffusion structure of the invention enables the light intensity close to the light source position to be more distributed to the position far away from the light source position, the brightness close to the light source position is reduced, and the brightness far away from the light source position is increased, so that the brightness close to the light source position is close to or the same as the brightness far away from the light source position, the uniformity of the display brightness of the light diffusion structure is greatly improved, and the uniform effect of the display brightness of the light diffusion sheet is further improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a prior art light diffusing structure;
FIG. 2 is a schematic diagram of a light diffusing structure according to a first embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cylindrical microlens in a vertical direction according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a light diffusion structure formed by circular cylindrical microlenses according to a first embodiment of the present invention;
FIG. 5 is a schematic view of a light diffusing structure formed by a triangular prism-shaped microlens according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of adjusting the light intensity distribution by the circular arc cylindrical micro-lens of the light diffusion structure according to the first embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a light diffusing structure according to a first embodiment of the present invention;
FIG. 8 is a graph of the light diffusing structure of the first embodiment of the present invention versus the light diffusing structure of the prior art for comparing the light intensity diffusing capabilities;
FIG. 9 is a schematic cross-sectional view of a light diffusing structure containing diffusing particles according to a first embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of a light diffusing structure containing a light absorbing material according to a first embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of a light diffusing structure after roughening treatment according to a first embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of a light diffusing structure provided with a resin material filling the columnar microlenses in accordance with one embodiment of the present invention;
FIG. 13 is a schematic view of a light diffusion sheet including light diffusion structures according to a second embodiment of the present invention;
icon: 10-a light diffusing structure; 101-cylindrical microlenses; 102-diffusing particles; 103-a light absorbing material; 104-rough surface; 105-a substrate; g-incident light; a Y-light source; a Z-center axis; m-luminance meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, the terms "lateral", "one side", "the other side", unless otherwise explicitly specified or limited, are to be construed broadly. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 2, a schematic diagram of a light diffusion structure according to an embodiment of the present invention is shown, in which a light diffusion structure includes a plurality of pillar-shaped microlenses 101 arranged in a transverse direction, a height of the pillar-shaped microlens 101 is marked as T, a width of the pillar-shaped microlens 101 is marked as P, and an aspect ratio of the pillar-shaped microlens is equal to the height of the pillar-shaped microlens 101/the width of the pillar-shaped microlens 101, that is, the aspect ratio of the pillar-shaped microlens is equal to T/P, and the aspect ratio of the pillar-shaped microlens gradually decreases from one side to the other side along a vertical direction of the light diffusion structure. Through setting up the column microlens aspect ratio along light diffusion structure's vertical direction and reducing gradually, can effectively reduce light diffusion structure's diffusion ability, reduce the scattering angle that light diffusion structure set light promptly, realize the light distribution of the different positions of arbitrary control for the viewer can both obtain more even luminance distribution visual effect in any position.
As a further explanation, the expression that the aspect ratio of the cylindrical microlens along the vertical direction of the light diffusion structure is gradually reduced should be understood in a broad sense, and the specific reduction condition needs to be set according to the light intensity distribution condition of the matched light source, and may exhibit continuous reduction, discontinuous reduction of the interval, and step-type reduction. Such as: the height-to-width ratios of the columnar microlenses in a certain region arranged laterally are the same, the height-to-width ratios of the columnar microlenses in the next region are the same, but the height-to-width ratios of the columnar microlenses in the two regions are different, and the characteristic of reducing in a regional manner is presented.
As a further explanation, the horizontally arranged lenticular microlenses may be arranged to be connected to each other, or may be arranged at a certain distance, and may be densely arranged in regions where the light intensity distribution is strong, sparsely arranged in regions where the light intensity distribution is weak, or may be arranged without lenticular microlenses.
It should be added that the aspect ratio of the cylindrical microlens 101 gradually decreases from side to side along the vertical direction of the light diffusion structure, and the ratio thereof can be reduced to zero, that is, the height T of the cylindrical microlens 101 can be reduced to zero, that is, there is no cylindrical microlens in the edge formation plane of the light diffusion structure. This light diffusing structure is used in the case where only a certain side portion of the light intensity in the diffusion is required. In addition, the light diffusion structure of the invention can correspondingly set the height and the width of the columnar micro lens according to the light intensity distribution of different positions of the light source, and the height-width ratio of the columnar micro lens structure is large for the position with strong light intensity distribution, and under the opposite condition, the height-width ratio of the columnar micro lens is small, so that the columnar micro lens setting method of the embodiment of the invention can be flexibly applied.
It should be further added that the aspect ratio of the pillar shaped microlens 101 gradually decreases from one side to the other side along the vertical direction of the light diffusion structure, where (also including the following) one side refers to a position close to the light source, and the corresponding other side refers to a position far away from the light source, specifically, the pillar shaped microlens with large aspect ratio is necessarily closer to the light source than the pillar shaped microlens with small aspect ratio, which is favorable for diffusing the light source where the light intensity distribution is strong.
Alternatively, as shown in fig. 3, a schematic cross-sectional view of a cylindrical microlens in a vertical direction according to an embodiment of the present invention is shown. As shown in fig. 3a, the cross section of the cylindrical microlens in the vertical direction is triangular, that is, a figure formed by connecting three line segments end to end; as shown in fig. 3b, the cross section of the cylindrical microlens in the vertical direction is trapezoidal, and of course, the cylindrical microlens can also be another figure formed by connecting four line segments end to end; as shown in fig. 3c, the cross section of the cylindrical microlens in the vertical direction is a graph formed by connecting two curves end to end, and of course, the cross section can also be a graph formed by connecting a plurality of curves end to end; as shown in fig. 3d, the cross section of the cylindrical microlens in the vertical direction is a graph formed by connecting a line segment and a curve end to end; as shown in fig. 3e, the cross section of the cylindrical microlens in the vertical direction is a graph formed by connecting three line segments and a curve end to end. Of course, the cross section of the cylindrical micro-lens in the vertical direction can also be a pattern formed by connecting a plurality of straight line segments and a plurality of curves end to end, which is not mentioned here.
To explain further, the cross-sectional shape patterns of the respective columnar microlenses that constitute the light diffusing structure may be the same, may be different, or may be partially the same. The cross section of each columnar microlens constituting the light diffusing structure may be any one of the above cross sections, or may be a combination of at least two of the above cross sections.
Alternatively, the cylindrical microlens is a circular arc cylindrical microlens, and the change of the aspect ratio of the cylindrical microlens is represented by a light diffusion structure formed by the cylindrical microlens. Fig. 4 is a schematic diagram of a light diffusion structure formed by circular arc cylindrical microlenses. As shown in fig. 4a, the height T of the cylindrical microlens 101 in the light diffusion structure decreases from one side to the other along the vertical direction of the light diffusion structure, and the width P of the cylindrical microlens 101 remains unchanged. As shown in fig. 4b, the height T of the cylindrical microlens 101 in the light diffusion structure decreases from one side to the other side along the vertical direction of the light diffusion structure, and the width P of the cylindrical microlens 101 gradually increases in the same direction. As shown in fig. 4c, the height T of the pillar-shaped microlenses 101 in the light diffusion structure gradually decreases from side to side along the vertical direction of the diffusion structure, and the width P of the pillar-shaped microlenses 101 gradually decreases along the same direction, but the height reduction of the pillar-shaped microlenses is greater than the width reduction of the pillar-shaped microlenses. As shown in fig. 4d, the height T of the cylindrical microlens 101 in the light diffusion structure is constant, and the width P of the cylindrical microlens gradually increases from one side to the other side along the vertical direction of the diffusion structure.
Alternatively, the cylindrical microlens 101 is a triangular prism-shaped microlens, that is, the cross section of the cylindrical microlens in the vertical direction of the light diffusion structure is triangular, and the light diffusion structure formed by the cylindrical microlens is used to present the height-to-width ratio variation of the cylindrical microlens. Fig. 5 is a schematic diagram of a light diffusion structure formed by circular arc cylindrical microlenses. As shown in fig. 5a, the height T of the cylindrical microlens 101 in the light diffusion structure decreases from one side to the other along the vertical direction of the light diffusion structure, and the width P of the cylindrical microlens 101 remains unchanged. As shown in fig. 5b, the height T of the cylindrical microlens 101 in the light diffusion structure decreases from one side to the other side along the vertical direction of the light diffusion structure, and the width P of the cylindrical microlens 101 gradually increases in the same direction. As shown in fig. 5c, the height T of the pillar-shaped microlenses 101 in the light diffusion structure gradually decreases from side to side along the vertical direction of the diffusion structure, and the width P of the pillar-shaped microlenses 101 gradually decreases along the same direction, but the height reduction of the pillar-shaped microlenses is greater than the width reduction of the pillar-shaped microlenses. As shown in fig. 5d, the height T of the pillar-shaped microlens 101 in the light diffusion structure is constant, and the width P of the pillar-shaped microlens gradually increases from one side to the other side along the vertical direction of the diffusion structure.
Fig. 6 is a schematic diagram of the light diffusion structure with the circular arc cylindrical microlens for adjusting the light intensity distribution. Light expanderThe height-width ratio of the columnar microlens on one side of the scattering structure is larger than that of the columnar microlens on the other side, and incident light rays G incident on the columnar microlens with the large height-width ratio are refracted on the arc-shaped surface of the columnar microlens, so that the curvature radius of the columnar microlens with the large height-width ratio is relatively small, an included angle formed by the incident light rays G in the same direction and the curvature radius of the columnar microlens with the large height-width ratio is large, namely, the incident angle of the incident light rays with the columnar microlens with the large height-width ratio is larger, and the refraction angle theta of the light rays refracted and emitted from the columnar microlens with the large height-width ratio is1Angle of refraction theta of light ray refracted and emitted from cylindrical microlens with small aspect ratio2The cylindrical micro lens with larger aspect ratio has more obvious deflection effect on emergent light, so the cylindrical micro lens has stronger redistribution capability on light intensity, the cylindrical micro lens with small aspect ratio has very weak deflection effect on the emergent light, and when the height of the cylindrical micro lens becomes zero, the light intensity distribution state is basically not changed, so the adjustment effect on light intensity distribution is realized by the principle.
Fig. 7 is a schematic diagram illustrating a test of the light diffusion capability of the light diffusion structure according to the embodiment of the present invention. A rectangular light diffusion structure sample is taken as a sample 1, and 9 test points are taken from the sample 1, namely (i), (ii), (iii), (iv), (v. (III), III and III are on the same horizontal line, and (IV), (V) and (IV) are on the same horizontal line, and (V), (V) and (III) are on the same horizontal line, and take a central axis Z as a center, wherein (V), (V) and (V) the distances between the six test point positions and the line segment at the extreme edge are 1/6 corresponding to the side length, and (V), (V) and (V) are located on the central axis Z, wherein (V) is located at the center of the whole sample 1. The specific test method comprises the following steps: the light source Y with oblique incidence is used to project light to the sample 1, the luminance meter M is positioned at the position 3M right in front of the sample 1, the center of the lens of the initial luminance meter is vertically aligned with the central point of the sample 1, the position of the luminance meter M is kept unchanged when other points are tested, and the central axis of the lens of the luminance meter M is aligned with each point by rotating the luminance meter M.
A light diffusion structure composed of vertically arranged cylindrical microlenses of the prior art, which is exactly the same size as sample 1, was taken as sample 2, and labeled accordingly. The test environments for the two samples were controlled to be the same, and the brightness values of 9 points on sample 1 and sample 2 were measured at different illumination values, respectively, and recorded to obtain the brightness test data shown in table 1.
TABLE 1 Brightness test data for 9 spots for two samples
As can be seen from the data in table 1, the illuminance of the light source Y itself at each position is a non-uniform state with a bright middle and dark sides, so it is necessary to use the light diffusion structure of the embodiment of the present invention to improve the problem of non-uniform luminance of the light source itself, so as to obtain a uniform luminance display effect.
A comparison of the light diffusion structure of the present invention (sample 1) and the light diffusion structure of the prior art (sample 2) with respect to the light intensity diffusion capability as shown in fig. 8 can be obtained from the data of table 1. It can be clearly seen from fig. 8 and table 1 that after the light intensity is diffused by the light diffusion structure (sample 2) in the prior art, the problem of uneven brightness is obviously existed that three points of (c), (b), and (c) close to the light source Y are higher than those far away from the light source, because the diffusion ability of the light diffusion structure in the prior art at each horizontal position is similar, and the trend of uneven brightness existing in the light diffusion structure cannot be changed under the condition of uneven light source. The scheme of the embodiment of the invention can reduce the brightness of the position close to the light source and increase the brightness of the position far away from the light source, so that the brightness close to the light source is closer to the brightness far away from the light source, and an excellent display brightness uniformity effect is obtained on the light diffusion structure. In addition, the technical scheme of the invention can well optimize the problem of nonuniform brightness of the light source and obtain a better brightness uniformity effect by matching.
Alternatively, fig. 9 is a schematic cross-sectional view of a light diffusing structure containing diffusing particles according to an embodiment of the present invention. The light diffusion structure comprises a plurality of cylindrical micro lenses 101 which are transversely arranged, diffusion particles 102 are arranged in the cylindrical micro lenses 101, and the diffusion particles 102 can enable light rays passing through the insides of the cylindrical micro lenses 101 to be uniformly scattered, so that the light intensity distribution is further more uniform. The diffusion particles include, but are not limited to, silica particles, alumina particles, titania particles, ceria particles, zirconia particles, tantalum oxide particles, zinc oxide particles, magnesium fluoride particles, etc., and their particle diameter is preferably 5nm to 200 nm. It should be noted that the light diffusion structure of the present invention mainly depends on the change of the structure itself to realize the diffusion regulating function of light, so that no diffusion particles may be arranged in the light diffusion structure, and a good light diffusion effect may be obtained. When the diffusion particles 102 are disposed in the columnar microlenses 101, the diffusion particles 102 may be uniformly distributed in the columnar microlenses 101 or may be non-uniformly distributed in the columnar microlenses 101, and for optimum effects, the diffusion particles 102 are preferably uniformly distributed in the columnar microlenses 101.
Alternatively, fig. 10 is a schematic cross-sectional view of a light diffusing structure containing a light absorbing material according to an embodiment of the present invention. As shown in fig. 10a, the light diffusing structure includes a plurality of cylindrical microlenses 101 arranged in a transverse direction, and only the light absorbing material 103 is disposed in the cylindrical microlenses 101, and the light absorbing material 103 can absorb some unwanted light and selectively transmit the wanted light. The light absorbing material herein includes, but is not limited to, various pigments, dyes or carbon black, black iron oxide, etc., and plays a role of filtering and toning light. It should be noted that, depending on the application, the light absorbing material may not be disposed in the cylindrical microlens. As shown in fig. 10, the light diffusion structure includes a plurality of cylindrical microlenses 101 arranged in a transverse direction, and further, a light absorbing material 103 is disposed on the basis of the diffusion particles 102 disposed in the cylindrical microlenses 101, so as to achieve the effects of light evening, filtering and color mixing, and have a very good effect in display applications.
Alternatively, fig. 11 is a schematic cross-sectional view of a light diffusing structure after roughening treatment according to an embodiment of the present invention. The light diffusion structure includes a plurality of cylindrical microlenses 101 arranged in a transverse direction, and a rough surface 104 is provided on a surface of the cylindrical microlenses 101. The rough surface 104 is formed by transferring or spraying a glue having diffusion particles onto the cylindrical surface of the columnar microlens 101 by a glue after roughening the cylindrical surface by means of, for example, sand blasting or a roughening treatment of the mold surface. The rough surface 104 can further diffuse light, and can be used for light evening, hardening protection or imaging.
Alternatively, a schematic cross-sectional view of a light diffusing structure provided with a resin material filling the columnar microlenses is shown in fig. 12. The light diffusion structure comprises a plurality of columnar microlenses 101 arranged in a transverse direction, a resin material for filling the columnar microlenses 101 is arranged on the surfaces of the columnar microlenses 101, and the refractive index n of the resin material2And refractive index n of the cylindrical microlens1Different. The cylindrical micro lens can be protected and prevented from being scratched and damaged by filling the surface of the cylindrical micro lens; the processing of other microstructures on the columnar microlens can be facilitated; the columnar micro lens can be conveniently bonded with other functional structure layers. Refractive index n of resin material for filling columnar microlens2Refractive index n of the material of the cylindrical microlens1The different purpose is to further promote the refraction of light at the interface of two materials and increase the light diffusion capability of the light diffusion structure.
As a further supplementary note, the material of the lenticular microlens includes, but is not limited to, a radiation-curable resin, a thermosetting resin, a reaction-type curable resin, a transparent glass, a transparent ceramic, etc., and the method for fabricating the lenticular microlens using the above raw material is to transfer and coat the raw material onto a base material using a roller mold in which the structure of the lenticular microlens is fabricated; the method for manufacturing the cylindrical microlens by using the transparent glass or the transparent ceramic is to form the cylindrical microlens on the glass or the ceramic by tool engraving or laser engraving or chemical etching.
The light diffusion structure of the embodiment of the invention enables the light intensity close to the light source position to be more distributed to the position far away from the light source position, so that the brightness close to the light source position is reduced, and the brightness far away from the light source position is increased, thereby enabling the brightness close to the light source position to be close to or the same as the brightness far away from the light source position, and greatly improving the uniformity of the display brightness of the light diffusion structure.
The light diffusion structure of the embodiment of the invention can be further applied to the fields of projection display, naked eye 3D, illumination and the like, for example, in the field of projection display, the light diffusion structure is used as a key component of a projection screen which is one of projection display core components.
Example two
Fig. 13 is a schematic view of a light diffusion sheet including a light diffusion structure. The light diffusion sheet comprises a substrate 105 and a light diffusion structure 10 made on the substrate according to the first embodiment of the present invention, wherein the light diffusion structure 10 comprises various cylindrical microlenses according to the first embodiment of the present invention.
Alternatively, the substrate 105 includes, but is not limited to, flexible plastic or rubber materials such as polyethylene, high polymer polypropylene, polystyrene, polyvinyl chloride, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer, or a transparent substrate with certain rigidity such as glass, acrylic, and ceramic.
The light diffusion sheet with the light diffusion structure of the first embodiment can enable light intensity close to the light source to be more distributed towards the position far away from the light source, so that the brightness close to the light source is reduced, the brightness far away from the light source is increased, the brightness close to the light source is close to or the same as the brightness far away from the light source, and the uniformity of the display brightness of the light diffusion sheet is greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A light diffusion structure comprises a plurality of columnar microlenses which are transversely arranged, and is characterized in that the height-width ratio of the columnar microlenses is gradually reduced from one side to the other side along the vertical direction of the light diffusion structure, wherein the height-width ratio of the columnar microlenses is equal to the height of the columnar microlenses/the width of the columnar microlenses.
2. The light diffusing structure of claim 1, wherein a cross section of the cylindrical micro lens in a vertical direction of the light diffusing structure is a shape formed by connecting at least three line segments end to end, or a shape formed by connecting at least two curves end to end, or a shape formed by connecting at least one line segment and at least one curve end to end.
3. The light diffusing structure according to claim 1, wherein the height of the plurality of cylindrical microlenses arranged along the vertical direction of the light diffusing structure is gradually reduced, and the width of the plurality of cylindrical microlenses is constant.
4. The light diffusing structure according to claim 1, wherein the height of the plurality of cylindrical microlenses arranged along the vertical direction of the light diffusing structure gradually decreases, and the width of the plurality of cylindrical microlenses gradually increases.
5. A light diffusing structure according to claim 1, wherein the height of said plurality of pillar-shaped microlenses arranged along the vertical direction of said light diffusing structure is gradually reduced, the width of said plurality of pillar-shaped microlenses is gradually reduced, and the height reduction of said plurality of pillar-shaped microlenses is greater than the width reduction.
6. The light diffusing structure according to claim 1, wherein the height of the plurality of cylindrical microlenses arranged along the vertical direction of the light diffusing structure is the same, and the width of the plurality of cylindrical microlenses is gradually increased.
7. The light diffusing structure of claim 1, wherein said columnar microlenses have diffusing particles disposed therein.
8. A light diffusing structure according to claim 1, wherein said columnar microlenses are provided with a light absorbing material therein.
9. The light diffusing structure according to claim 1, wherein said columnar microlens surface is provided with a resin material filling said columnar microlens, said resin material having a refractive index different from that of said columnar microlens.
10. A light diffusing sheet comprising a substrate, and further comprising a light diffusing structure according to any one of claims 1 to 9 formed on the substrate.
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| CN202011099628.3A CN112198571A (en) | 2020-10-15 | 2020-10-15 | Light diffusion structure and light diffusion piece |
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| CN (1) | CN112198571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485934A (en) * | 2020-11-13 | 2022-05-13 | 北京小米移动软件有限公司 | Light detection assembly, screen assembly and electronic terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273757A (en) * | 1993-03-23 | 1994-09-30 | Canon Inc | Light source device and display device provided with this device |
| JP2012242771A (en) * | 2011-05-24 | 2012-12-10 | Kyowa Lamicoat:Kk | Light diffusing lens sheet and manufacturing method hereof |
| CN109407187A (en) * | 2018-12-15 | 2019-03-01 | 上海鲲游光电科技有限公司 | A kind of multilayered structure optical diffusion sheet |
-
2020
- 2020-10-15 CN CN202011099628.3A patent/CN112198571A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273757A (en) * | 1993-03-23 | 1994-09-30 | Canon Inc | Light source device and display device provided with this device |
| JP2012242771A (en) * | 2011-05-24 | 2012-12-10 | Kyowa Lamicoat:Kk | Light diffusing lens sheet and manufacturing method hereof |
| CN109407187A (en) * | 2018-12-15 | 2019-03-01 | 上海鲲游光电科技有限公司 | A kind of multilayered structure optical diffusion sheet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485934A (en) * | 2020-11-13 | 2022-05-13 | 北京小米移动软件有限公司 | Light detection assembly, screen assembly and electronic terminal |
| CN114485934B (en) * | 2020-11-13 | 2024-01-30 | 北京小米移动软件有限公司 | Light detection assembly, screen assembly and electronic terminal |
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Application publication date: 20210108 |