CN112198570A - Light diffusion structure and light diffusion piece - Google Patents
Light diffusion structure and light diffusion piece Download PDFInfo
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- CN112198570A CN112198570A CN202011099622.6A CN202011099622A CN112198570A CN 112198570 A CN112198570 A CN 112198570A CN 202011099622 A CN202011099622 A CN 202011099622A CN 112198570 A CN112198570 A CN 112198570A
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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 columnar microlenses which are vertically arranged, and the central axis is used as a reference, the height-width ratios of the columnar microlenses transversely arranged towards two ends of the light diffusion structure are sequentially reduced, the central axis is the symmetry axis of the columnar microlenses, the height-width ratios are maximum values, and the height-width ratios are the heights/widths of the columnar microlenses. 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 middle light intensity to be more distributed towards two sides, reduces the middle brightness, increases the brightness at two sides, further enables the middle brightness to be close to/the same as the brightness at two sides, greatly improves the uniformity of the display brightness of the light diffusion structure, and further promotes the uniform effect of the display brightness of the formed light diffusion sheet.
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:
the utility model provides a light diffusion structure, includes a plurality of columnar microlens that are vertical arrangement to the center pin is the benchmark, follows light diffusion structure transversely toward both ends direction setting the aspect ratio of columnar microlens reduces in proper order, the center pin is that the aspect ratio is the maximum the symmetry axis of columnar microlens, the aspect ratio equals the height of columnar microlens/the width of columnar microlens.
As an optional mode, a cross section of the cylindrical microlens perpendicular to the central axis 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.
Alternatively, the heights of the plurality of columnar microlenses provided in both end directions in the lateral direction of the light diffusing structure are sequentially reduced with respect to the central axis, and the widths of the plurality of columnar microlenses are constant.
Alternatively, the heights of the plurality of columnar microlenses provided in both end directions in the lateral direction of the light diffusing structure are sequentially decreased and the widths of the plurality of columnar microlenses are sequentially increased with respect to the central axis.
Alternatively, the heights of the plurality of columnar microlenses arranged in the lateral direction of the light diffusing structure toward both ends decrease in sequence, the widths of the plurality of columnar microlenses decrease in sequence, and the height decrease amount of the plurality of columnar microlenses is larger than the width decrease amount, with the central axis as a reference.
Alternatively, the plurality of columnar microlenses provided along the lateral direction of the light diffusing structure at both ends thereof may have the same height with respect to the central axis, and the widths of the plurality of columnar microlenses may be increased in order.
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 middle light intensity to be more distributed towards two sides, reduces the middle brightness and increases the brightness of the two sides, thereby enabling the middle brightness to be close to or the same as the brightness of the two sides, and obtaining excellent display brightness uniformity effect.
The light diffusion sheet provided by the embodiment of the invention 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 middle light intensity to be more distributed towards two sides, reduces the middle brightness, increases the brightness at two sides, further enables the middle brightness to be close to/the same as the brightness at two sides, greatly improves the uniformity of the display brightness of the light diffusion structure, and further promotes the uniform effect of the display brightness of the formed light diffusion sheet.
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 perpendicular to a central axis 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; a Z-center axis; g-incident light; a Y-light source; 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 "central axis", "vertical", and "vertical" are to be understood broadly, unless otherwise explicitly specified and defined. 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 view of a light diffusion structure according to an embodiment of the present invention is shown, where the light diffusion structure includes a plurality of pillar-shaped microlenses 101 arranged vertically, where a height of the pillar-shaped microlens 101 is marked as T, a width of the pillar-shaped microlens 101 is marked as P, an aspect ratio of the pillar-shaped microlens is a height of the pillar-shaped microlens 101/a width of the pillar-shaped microlens 101, that is, an aspect ratio of the pillar-shaped microlens is marked as T/P, and a symmetry axis of the pillar-shaped microlens with a maximum aspect ratio is marked as a central axis Z. The height-to-width ratios of the columnar microlenses arranged in the lateral direction of the light diffusing structure toward both ends are sequentially reduced with the central axis Z as a reference. The height-width ratio of the columnar micro-lenses arranged from the central shaft along the transverse direction of the light diffusion structure to the two ends is reduced in sequence, so that the diffusion capacity of the light diffusion structure can be effectively reduced, namely, the scattering angle of the light diffusion structure to light is reduced, the light intensity distribution of different positions can be controlled randomly, and a viewer can obtain a more uniform brightness distribution visual effect at any position.
To explain further, the expression that the aspect ratios of the cylindrical microlenses arranged along the transverse direction of the light diffusion structure are sequentially reduced in the direction of both ends with the central axis Z as the reference should be understood in a broad sense, and the specific reduction needs to be set according to the light intensity distribution of the matched light source, and may be a continuous reduction, a discontinuous reduction of the intervals, or a step-like reduction. For example, the height-to-width ratios of the columnar microlenses in a certain region of the vertical arrangement 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 columnar microlenses in the two regions are characterized by being reduced in a regional manner.
To explain further, the height-to-width ratios of the columnar microlenses arranged in the lateral direction of the light diffusing structure toward both ends are sequentially decreased with respect to the central axis Z, and may be symmetrically decreased from the central axis Z toward both ends; an asymmetric reduction, which is much reduced on one side and less reduced on the other side, can also be used for adjusting the light intensity with the light intensity distribution having the uneven distribution on both sides.
As a further explanation, the columnar microlenses arranged vertically may be arranged to be connected to each other, or may be arranged at a certain distance, and may be densely arranged in a region where the light intensity distribution is strong, sparsely arranged in a region where the light intensity distribution is weak, or may be arranged without the columnar microlenses.
Further, the expression of the central axis Z should be understood in a broad sense, which refers to the symmetry axis of the cylindrical microlens having the maximum aspect ratio, it is understood that the cylindrical microlens having the maximum ratio of height to width is not necessarily located at the center of the vertically arranged light diffusion structure, and it is required to be determined according to the intensity of the light intensity distribution, if the light intensity distribution is characterized by the strongest center, the cylindrical microlens having the maximum aspect ratio is located at the center of the light diffusion structure, but if the light intensity distribution is not characterized by the strongest center, the cylindrical microlens having the maximum aspect ratio is not located at the center of the light diffusion structure, so the central axis Z is not necessarily the central axis of the light diffusion structure. In addition, when the distribution of the cylindrical microlenses is a step-type distribution, the cylindrical microlens having the largest aspect ratio may be a plurality of connected microlenses, and the central axis Z shall mean a common central axis of symmetry of all the cylindrical microlenses having the same ratio in a region where the ratio of the height to the width of the cylindrical microlens is the largest.
It should be added that the aspect ratio of the cylindrical microlens 101 decreases from the central axis Z to the two ends, and the ratio 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 of the light diffusion structure. The light diffusion structure is used for diffusing the light intensity of a partial area near the central axis, and the light intensity does not need to be diffused at a certain position on both sides. 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 method for setting the columnar micro lens can be flexibly applied.
Alternatively, as shown in fig. 3, the cylindrical microlens of the present invention is a schematic cross-sectional view perpendicular to the central axis. As shown in fig. 3a, the cross section of the cylindrical microlens perpendicular to the central axis is triangular, i.e. a figure formed by three line segments connected end to end; as shown in fig. 3b, the cross section of the cylindrical microlens perpendicular to the central axis is trapezoidal, and of course, it can also be another figure formed by four line segments connected end to end; as shown in fig. 3c, the cross section of the cylindrical microlens perpendicular to the central axis is a figure formed by connecting two curves end to end, or a figure formed by connecting a plurality of curves end to end; as shown in fig. 3d, the cross section of the cylindrical microlens perpendicular to the central axis 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 perpendicular to the central axis is a graph formed by connecting three line segments and a curve end to end. Of course, the cross section of the cylindrical microlens perpendicular to the central axis may 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 central axis Z of the cylindrical microlens 101 in the light diffusion structure is not at the center of the physical dimension of the light diffusion structure, the heights T of the cylindrical microlenses 101 constituting the light diffusion structure decrease along the central axis Z toward the two lateral ends, and the width P of the cylindrical microlens 101 remains unchanged. As shown in fig. 4b, the central axis Z of the cylindrical microlens 101 in the light diffusion structure is at the center of the physical dimension of the light diffusion structure, the heights T of the plurality of cylindrical microlenses 101 constituting the light diffusion structure decrease along the central axis Z toward the two lateral ends, and the widths of the cylindrical microlenses 101 gradually increase along the central axis Z toward the two lateral ends. As shown in fig. 4c, the height T of the pillar-shaped microlenses 101 in the light diffusion structure decreases sequentially from the central axis Z to both lateral ends, and the width P of the pillar-shaped microlenses decreases sequentially from the central axis Z to both lateral ends, but the height decrease of the pillar-shaped microlenses is greater than the width decrease 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 101 gradually increases toward both lateral ends along the central axis Z.
Alternatively, the cylindrical microlens 101 is a triangular prism-shaped microlens, i.e. the cross section of the cylindrical microlens perpendicular to the central axis is triangular, and the height-to-width ratio variation of the cylindrical microlens is represented by the light diffusion structure formed by the cylindrical microlens. Fig. 5 is a schematic view of a light diffusion structure formed by triangular cylindrical microlenses. As shown in fig. 5a, the central axis Z of the cylindrical microlens 101 in the light diffusion structure is not at the center of the physical dimension of the light diffusion structure, the heights T of the cylindrical microlenses 101 constituting the light diffusion structure decrease along the central axis Z toward the two lateral ends, and the width P of the cylindrical microlens 101 remains unchanged. As shown in fig. 5b, the central axis Z of the cylindrical microlens 101 in the light diffusion structure is at the center of the physical dimension of the light diffusion structure, the heights T of the plurality of cylindrical microlenses 101 constituting the light diffusion structure decrease along the central axis Z toward the two lateral ends, and the widths of the cylindrical microlenses 101 gradually increase along the central axis Z toward the two lateral ends. As shown in fig. 5c, the height T of the pillar-shaped microlenses 101 in the light diffusion structure decreases sequentially from the central axis Z to both lateral ends, and the width P of the pillar-shaped microlenses decreases sequentially from the central axis Z to both lateral ends, but the height decrease of the pillar-shaped microlenses is greater than the width decrease of the pillar-shaped microlenses. As shown in fig. 5d, the height T of the cylindrical microlens 101 in the light diffusion structure is constant, and the width P of the cylindrical microlens 101 gradually increases toward both lateral ends along the central axis Z.
Fig. 6 is a schematic diagram of the light diffusion structure with the circular arc cylindrical microlens for adjusting the light intensity distribution. Incident light rays G incident to the columnar micro lens with the central shaft are refracted on the arc surface of the columnar micro lens, the height-width ratio of the columnar micro lens with the central shaft is larger than that of the columnar micro lens at the edges of two transverse ends, the curvature radius of the columnar micro lens with the central shaft is relatively smaller, an included angle formed by the incident light rays G in the same direction and the curvature radius of the columnar micro lens with the central shaft is large, namely the light ray incident angle with the columnar micro lens with the central shaft is larger, and the refraction angle theta of the light rays refracted and emitted from the columnar micro lens with the central shaft is larger1Angle of refraction theta of light ray refracted from the cylindrical microlenses at both lateral end edges2The cylindrical micro-lenses at the central shaft have more obvious deflection effect on the emergent light, so the light intensity redistribution capability is stronger, the deflection effect on the emergent light by the cylindrical micro-lenses at the edges of the two transverse ends is very weak, and when the height of the cylindrical micro-lenses becomes zero, the light intensity distribution state is basically not changed, so the light intensity distribution adjusting effect 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 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 of the prior art (sample 2), there is a problem of uneven brightness in the middle and dark edge, because the light diffusion structure of the prior art has similar diffusion capability at each position in the transverse direction, and the tendency of uneven brightness existing in the light diffusion structure cannot be changed in the case of the uneven light source. The scheme of the embodiment of the invention can reduce the middle brightness and increase the brightness of two sides, so that the middle brightness is closer to the brightness of two sides, 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 columnar microlenses 101 which are vertically arranged, diffusion particles 102 are arranged in the columnar microlenses 101, and the diffusion particles 102 can enable light rays passing through the interior of the columnar microlenses 101 to be uniformly scattered, so that the light intensity is further more uniformly distributed. 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 diffusion structure includes a plurality of vertically arranged pillar-shaped microlenses 101, and only the light absorption material 103 is disposed in the pillar-shaped microlenses 101, and the light absorption 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 vertically arranged cylindrical microlenses 101, 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 uniformization, 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 comprises a plurality of columnar microlenses 101 vertically arranged, and a rough surface 104 is arranged on the surface of each columnar microlens 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 vertically arranged, a resin material for filling and leveling 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.
The material of the cylindrical microlens in this embodiment includes, but is not limited to, radiation curable resin, thermosetting resin, reaction type curable resin, transparent glass, transparent ceramic, etc., and the method for manufacturing the cylindrical microlens using the above raw materials is to transfer and coat the raw materials onto a base material by using a roller mold in which the cylindrical microlens structure is manufactured; 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 middle light intensity to be more distributed towards two sides, so that the middle brightness is reduced, the brightness of the two sides is increased, the middle brightness is close to/the same as the brightness of the two sides, and the uniformity of the display brightness of the light diffusion structure is greatly improved.
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 including the light diffusion structure of the first embodiment can make the middle light intensity more distributed to both sides, so that the middle brightness is reduced, and the brightness of both sides is increased, thereby making the middle brightness close to or the same as the brightness of both sides, and obtaining an excellent display brightness uniformity effect.
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. The utility model provides a light diffusion structure, includes a plurality of columnar microlens that are vertical arrangement, its characterized in that uses the center pin as the benchmark, follows light diffusion structure transversely toward the both ends direction setting the aspect ratio of columnar microlens reduces in proper order, the center pin is that the aspect ratio is the maximum the symmetry axis of columnar microlens, the aspect ratio is equal the height of columnar microlens/the width of columnar microlens.
2. The light-diffusing structure of claim 1, wherein a cross section of said cylindrical microlens perpendicular to said central axis is a shape formed by joining at least three line segments end to end, or at least two curves end to end, or at least one line segment and at least one curve end to end.
3. The light diffusing structure according to claim 1, wherein the heights of the plurality of columnar microlenses provided in both end directions in a lateral direction of the light diffusing structure are sequentially reduced with respect to the central axis, and the widths of the plurality of columnar microlenses are constant.
4. The light diffusing structure according to claim 1, wherein the heights of the plurality of columnar microlenses provided in both end directions in a transverse direction of the light diffusing structure are sequentially decreased and the widths of the plurality of columnar microlenses are sequentially increased with respect to the central axis.
5. A light diffusing structure according to claim 1, wherein the heights of the plurality of pillar-shaped microlenses arranged in the lateral direction of the light diffusing structure toward both ends decrease in sequence, the widths of the plurality of pillar-shaped microlenses decrease in sequence, and the height decrease of the plurality of pillar-shaped microlenses is greater than the width decrease, based on the central axis.
6. The light diffusing structure according to claim 1, wherein the heights of the plurality of columnar microlenses are the same and the widths of the plurality of columnar microlenses are gradually increased, with respect to the central axis.
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.
Priority Applications (1)
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| CN202011099622.6A CN112198570A (en) | 2020-10-15 | 2020-10-15 | Light diffusion structure and light diffusion piece |
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| CN202011099622.6A CN112198570A (en) | 2020-10-15 | 2020-10-15 | Light diffusion structure and light diffusion piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031152A (en) * | 2024-04-15 | 2024-05-14 | 常州星宇车灯股份有限公司 | Optical system for improving lighting uniformity and car lamp and car using same |
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| 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 |
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| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031152A (en) * | 2024-04-15 | 2024-05-14 | 常州星宇车灯股份有限公司 | Optical system for improving lighting uniformity and car lamp and car using same |
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