CN111929977A - Projection screen and projection system - Google Patents
Projection screen and projection system Download PDFInfo
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- CN111929977A CN111929977A CN202011099621.1A CN202011099621A CN111929977A CN 111929977 A CN111929977 A CN 111929977A CN 202011099621 A CN202011099621 A CN 202011099621A CN 111929977 A CN111929977 A CN 111929977A
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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
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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
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Abstract
The invention provides a projection screen and a projection system, and belongs to the field of projection display. A projection screen comprises a columnar microlens layer, a first substrate layer and a reflection microstructure layer, wherein the columnar microlens layer is arranged along the thickness direction of the projection screen, the columnar microlens layer is arranged on one side of the first substrate layer and comprises a plurality of columnar microlenses which are vertically arranged, the height-width ratio of the columnar microlenses, which is arranged along the transverse direction of the projection screen towards the two ends, is gradually reduced by taking the central shaft of the columnar microlens layer as a reference, the central shaft is the symmetrical shaft of the columnar microlenses with the maximum height-width ratio, and the height-width ratio is the height of the columnar microlenses/the width of the columnar microlenses; the reflecting microstructure layer is provided with a plurality of microstructures, and the microstructures are arc-shaped, parabolic, elliptical or linear. The projection system comprises a projector and the projection screen. The invention improves the brightness uniformity of the projection screen and the projection system.
Description
Technical Field
The invention belongs to the technical field of projection display, and particularly relates to a projection screen and a projection system.
Background
The projection display needs a projector and a projection screen, the projection screen is used for imaging an image sent by the projector and redistributing the projection light intensity, and the redistribution of the projection light intensity by the projection screen needs to depend on various fine structures on the screen to diffuse and converge projection light or control the transmission direction of the light according to needs so as to meet the requirements of different viewing fields. The existing projection screen has a wide problem that the brightness displayed on the screen is different greatly at different viewing positions, unlike the LCD or LED screen, which does not have a large difference in display brightness within a large viewing field range, so one of the differences between the projection screen and the LCD or LED screen is that the brightness experienced by the viewer is not uniform under different viewing fields on the projection screen, which greatly affects the visual experience of the viewer.
Generally, a projection screen is provided with vertically-connected and arranged columnar lenses with the same size to diffuse light of a projector, so that better brightness uniformity is expected to be obtained in the horizontal direction of the projection screen, for example, a patent document with the domestic patent application publication number of CN107102508A describes that a connected columnar lens with the same size is used for diffusing light of the projector, as shown in fig. 1, the principle that the vertically-connected and arranged columnar lenses with the same size have the same horizontal diffusion capability in each position on the screen is utilized to realize diffusion distribution of light intensity in the horizontal direction of the projection screen. But generally one of the ways in which the intensity of light emitted by the projector is distributed at various positions on the projection screen is a phenomenon that the middle portion is stronger than the two side portions, the intensity distribution of the light emitted by the projector is not itself the same at every location on the projection screen, the loss of the projection light rays incident at different angles at various positions of the projection screen is also different, and the light rays converged by other optical microstructures on the projection screen also cause uneven distribution of light intensity on the projection screen, while the sizes in the previous examples are the same and the diffusion capacities of the consecutively arranged lenticular lenses are the same at each position, it does not improve the problem of uneven brightness of the projector itself, and also makes the distribution of light intensity on the projection screen more uneven, the image display of the projection screen of the prior art may present the problem of uneven brightness with bright middle and dark sides.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a projection screen, which solves the problem of uneven intensity of the displayed image of the projection screen caused by uneven light intensity distribution of the light source in the conventional projection screen.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a projection screen comprises a columnar microlens layer, a first substrate layer and a reflection microstructure layer, wherein the columnar microlens layer is arranged along the thickness direction of the projection screen, the columnar microlens layer is arranged on one side of the first substrate layer and comprises a plurality of columnar microlenses which are vertically arranged, the height-width ratio of the columnar microlenses, which is arranged along the transverse direction of the projection screen towards the two ends, is gradually reduced by taking the central shaft of the columnar microlens layer as a reference, the central shaft is the symmetrical shaft of the columnar microlenses with the maximum height-width ratio, and the height-width ratio is the height of the columnar microlenses/the width of the columnar microlenses; the reflecting microstructure layer is provided with a plurality of microstructures, and the microstructures are arc-shaped, parabolic, elliptical or linear.
As an optional mode, a cross section of the cylindrical microlens in the transverse direction of the projection screen 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.
As an optional mode, the cross section of the microstructure in the thickness direction of the projection screen 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.
As an alternative, diffusion particles are disposed within the cylindrical microlenses.
As an alternative, a light absorbing material is disposed inside the cylindrical microlens.
As an optional mode, the reflective microstructure layer is disposed on a side of the first substrate layer away from the pillar microlens layer, and a surface of the pillar microlens layer away from the first substrate layer is a rough surface.
As an optional mode, the surface of one side, away from the cylindrical microlens layer, of the first substrate layer is a rough surface; one side of the columnar microlens layer, which is far away from the first substrate layer, is provided with a filling resin material layer for filling the columnar microlens layer, and the reflection microstructure layer is connected with the columnar microlens layer through the filling resin material layer.
As an alternative, the surface of the side of the lenticular microlens layer away from the first substrate layer is a rough surface.
As an alternative, the projection screen further comprises a second substrate layer disposed between the leveling resin material layer and the reflective microstructure layer.
As an optional mode, a reflective layer having a specular reflection function or a diffuse reflection function is disposed on a side of the reflective micro-structural layer away from the cylindrical micro-lens layer.
As an optional mode, the projection screen further comprises a black back plate and a decorative frame, the black back plate is arranged on one side of the reflection layer far away from the cylindrical micro-lens layer, and the decorative frame wraps the periphery of the projection screen.
As an optional mode, the projection screen further includes a magnetic material or a suspension member disposed on a side of the black back plate away from the lenticular microlens layer.
Based on the projection screen, the invention also provides a projection system, which enables the middle light intensity to be more distributed towards two sides, and promotes the middle brightness of the projection screen to be reduced and the brightness of the two sides to be increased, so that the middle brightness on the projection screen is close to/the same as the brightness of the two sides.
The projection system provided by the embodiment of the invention comprises the projector and the projection screen.
The invention has the following beneficial effects:
aiming at the problem that the light intensity of a projector is distributed on a projection screen in a strong middle and weak two sides to cause uneven display brightness distribution of the projection screen, the projection screen increases the diffusion capacity of the middle light intensity of light emitted by the projector in a pertinence manner, reduces the diffusion capacity of the light intensity on the two sides, enables the middle light intensity to be more distributed towards the two sides, and promotes the middle brightness of the projection screen to be reduced and the brightness on the two sides to be increased, so that the middle brightness on the projection screen is close to or the same as the brightness on the two sides, and the display brightness uniformity effect of the projection system is greatly 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 view of a prior art projection screen;
FIG. 2 is a schematic structural diagram of a projection screen according to a first embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cylindrical microlens projection screen according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a cylindrical microlens layer formed by arc cylindrical microlenses according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a cylindrical microlens layer for adjusting light intensity distribution according to a first embodiment of the present invention;
FIG. 6 is a schematic view of a reflective microstructure layer according to a first embodiment of the present invention;
FIG. 7 is a diagram illustrating a test of the light diffusion capability of a projection screen according to a first embodiment of the present invention;
FIG. 8 is a graph comparing the light intensity spreading capability of a projection screen according to a first embodiment of the present invention with that of a projection screen according to a prior art;
FIG. 9 is a schematic diagram of a projection screen according to a second embodiment of the present invention, in which diffusing particles and/or light absorbing materials are disposed on a lenticular layer;
FIG. 10 is a top view of a projection screen according to a third embodiment of the present invention;
FIG. 11 is a top view of a projection screen according to a fourth embodiment of the present invention;
FIG. 12 is a top view of a projection screen according to a fifth embodiment of the present invention;
FIG. 13 is a top view of a projection screen configuration according to a sixth embodiment of the present invention;
FIG. 14 is a top view of a projection screen according to a seventh embodiment of the present invention;
FIG. 15 is a top view of a projection screen configuration according to an eighth embodiment of the present invention;
FIG. 16 is a top view of a projection screen configuration according to a ninth embodiment of the present invention;
fig. 17 is a plan view of a projection screen according to a tenth embodiment of the present invention;
FIG. 18 is a top view of a projection screen configuration according to an eleventh embodiment of the present invention;
FIG. 19 is a schematic diagram of optical path transmission in a top view direction of a projection system according to a twelfth embodiment of the present invention;
icon: 10-a projection screen; 20-a projection system; 101-a lenticular microlens layer; 102-a first substrate layer; 103-a reflective microstructure layer; 104-a second substrate layer; 105-leveling the resin material layer; 106-a reflective layer; 107-black back panel; 108-decorative border; 109-hanging parts; 1011-cylindrical microlens; 1012-rough surface; 1031-microstructure; 1032-a first main reflective surface; 1033-a second main reflective surface; 1034-diffusion particles; 1035-light absorbing material; t-the height of the cylindrical microlens, and P-the width of the cylindrical microlens; a Z-center axis; g-incident light; a Y-projector; 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 "transverse" 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, the projection screen of the present invention includes a cylindrical microlens layer 101, a first substrate layer 102, and a reflective microstructure layer 103, which are disposed along the thickness direction of the projection screen, where the cylindrical microlens layer 101 is disposed on one side of the first substrate layer 102, and the reflective microstructure 103 is disposed on one side of the first substrate layer 102 away from the cylindrical microlens layer 101; the cylindrical microlens layer 101 includes a plurality of cylindrical microlenses 1011 arranged vertically, and the height-to-width ratios of the cylindrical microlenses 1011 disposed along the transverse direction of the projection screen 10 toward both ends of the projection screen are gradually reduced with the central axis Z of the cylindrical microlens layer 101 as a reference, where the central axis Z is a symmetry axis of the cylindrical microlenses 1011 whose height-to-width ratio is the maximum, the height of the marking cylindrical microlenses 1011 is T, the width of the cylindrical microlenses 1011 is P, and the height-to-width ratio of the cylindrical microlenses 1011 is a ratio of the height of the cylindrical microlenses 1011 to the width of the cylindrical microlenses 1011, that is, the height-to-width ratio of the cylindrical microlenses = T/P. The reflective microstructure layer 103 is provided with a plurality of microstructures 1031, and the microstructures 1031 may be circular arc microstructures, parabolic microstructures, elliptical microstructures, or linear microstructures; the microstructure 1031 includes two main reflective surfaces, a first main reflective surface 1032 and a second main reflective surface 1033.
By way of further explanation, the aspect ratio of the cylindrical microlenses 1011 along the transverse direction of the projection screen 10 toward both ends can be gradually decreased to effectively reduce the diffusing capability of the cylindrical microlenses 1011, i.e. to reduce the scattering angle of light, so that the viewer can obtain a more uniform visual effect of brightness distribution when viewing the projection screen 10 at any position according to the light intensity distribution of the projector and the different positions on the projection screen.
For further explanation, the expression that the aspect ratios of the cylindrical microlenses arranged along the transverse direction of the projection screen 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 aspect ratios of the columnar microlenses 1011 disposed along the lateral direction of the projection screen toward both ends are sequentially reduced with respect to the central axis Z, and may be symmetrically reduced toward both ends from the central axis Z; 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 vertically arranged lenticular microlenses 1011 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 lenticular 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 cylindrical microlens layer 101 including the plurality of cylindrical microlenses 1011 arranged vertically, and it is required to be determined according to the intensity of the light intensity distribution, and 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 cylindrical microlens layer 101, 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 cylindrical microlens layer 101, so the central axis Z is not necessarily the central axis of the cylindrical microlens layer 101. 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 projection screen. This arrangement is used in the case where only the light intensity in the partial region near the central axis needs to be diffused, and the light intensity does not need to be diffused at a certain position on both sides. In addition, the projection screen 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 invention can be flexibly applied.
Alternatively, as shown in fig. 3, the cross-sectional view of the cylindrical microlens in the lateral direction of the projection screen is shown. As shown in fig. 3a, the cross section of the cylindrical microlens in the transverse direction of the projection screen 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 transverse direction of the projection screen 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 transverse direction of the projection screen is a graph formed by connecting two curves end to end, but 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 transverse direction of the projection screen 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 transverse direction of the projection screen is a figure formed by connecting three line segments and a curve end to end. Of course, the cross section of the cylindrical microlens in the transverse direction of the projection screen may also be a pattern formed by connecting a plurality of straight lines and a plurality of curves end to end, which is not mentioned here.
As a further explanation, the cross-sections of the individual lenticular microlenses that make up the lenticular microlens layer in the lateral direction of the projection screen may be the same, may be different, or may be partially the same. The cross section of each of the columnar microlenses constituting the columnar microlens layer may be any one of the above-described patterns, or may be a combination of at least two of the above-described patterns.
Alternatively, the cylindrical microlens 1011 is a circular arc cylindrical microlens, and the cylindrical microlens layer composed of the cylindrical microlens 1011 exhibits a variation in aspect ratio of the cylindrical microlens. Fig. 4 is a schematic diagram of a cylindrical microlens layer formed by circular arc cylindrical microlenses. As shown in fig. 4a, the central axis Z of the cylindrical microlens 1011 of the cylindrical microlens layer in the projection screen of the present invention is not at the center of the physical dimension of the cylindrical microlens layer, the height T of the plurality of cylindrical microlenses 1011 forming the cylindrical microlens layer gradually decreases from the central axis Z to the two lateral ends, and the width P of the cylindrical microlenses 1011 remains unchanged. As shown in fig. 4b, the central axis Z of the cylindrical microlens 1011 of the cylindrical microlens layer in the projection screen of the present invention is at the center of the physical dimension of the cylindrical microlens layer, the height T of the plurality of cylindrical microlenses 1011 forming the cylindrical microlens layer gradually decreases from the central axis Z to the two ends in the transverse direction, and the width P of the cylindrical microlenses 1011 gradually increases from the central axis Z to the two ends in the transverse direction. As shown in fig. 4c, the height T of the cylindrical microlens 1011 of the cylindrical microlens layer in the projection screen of the present invention gradually decreases from the central axis Z to both lateral ends, and the width P of the cylindrical microlens 1011 decreases from the central axis Z to both lateral ends, but the height decrease of the cylindrical microlens 1011 is greater than the width decrease. As shown in fig. 4d, the height T of the cylindrical microlens 1011 of the cylindrical microlens layer in the projection screen of the present invention is constant, and the width P of the cylindrical microlens 1011 gradually increases toward both lateral ends along the central axis Z.
It should be noted that there are many embodiments in which the aspect ratio of the cylindrical microlens 1011 is gradually reduced, and the embodiments are not limited to the four cases described above. The idea of controlling the light intensity distribution by changing the aspect ratio of the columnar microlens 1011 falls within the scope of the idea of the present invention.
Further, as shown in FIG. 5, the cylindrical microlens layer adjusts the light intensity distributionManaging the graph; the incident light G incident on the cylindrical microlens 1011 with the central axis in the cylindrical microlens layer is refracted on the arc surface of the cylindrical microlens 1011, and since the aspect ratio of the cylindrical microlens 1011 with the central axis is greater than the aspect ratios of the cylindrical microlenses 1011 at the two lateral end edges, the curvature radius (the center of the circle is O) of the cylindrical microlens 1011 with the central axis2) Relatively small, the included angle formed by the incident light ray G in the same direction and the radius of curvature of the cylindrical microlens 1011 at the central axis is large, that is, the incident angle of the light ray with the cylindrical microlens 1011 at the central axis is larger, so the refraction angle θ of the light ray refracted and emitted from the cylindrical microlens 1011 at the central axis1Angle of refraction theta of light rays refracted and emitted from the columnar microlenses 1011 at both lateral end edges2Larger, i.e. cylindrical microlens 1011 (with center axis O) with central axis2) The deflection effect on the emergent light is more obvious, so the light intensity redistribution capability is stronger, and the cylindrical micro-lenses 1011 (with the center of the circle being O) at the edges of the two transverse ends1) The deflection effect on the emergent light is weak, and when the height of the columnar microlens 1011 becomes zero, the light intensity distribution state is not changed basically, so that the adjustment effect on the light intensity distribution is realized by the principle.
Further, the material of the cylindrical microlens includes but is not limited to ray-curable resin, thermosetting resin, reaction-type curable resin, etc., and the method for manufacturing the cylindrical microlens by using the above raw material is to transfer and coat the raw material onto the base material by using a roller mold for manufacturing the cylindrical microlens structure; 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.
By way of further illustration, the first substrate layer 102 may be made of materials including, but not limited to, flexible plastic or rubber materials such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, casein phosphopeptide, biaxial polypropylene, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer, or transparent substrates with certain rigidity such as glass, acrylic, ceramic, etc.
Further, the first substrate layer 102 may be colored by a gray dye/pigment, so that the transmittance of the first substrate layer 102 is properly reduced to adjust the overall appearance color of the projection screen, increase the absorption of ambient light, and improve the contrast of the projection screen.
Alternatively, a schematic view of a reflective microstructure layer is shown in fig. 6. A microstructure 1031 is arranged on the reflective microstructure layer, and as shown in fig. 6a, the microstructure 1031 is an arc-shaped microstructure; as shown in fig. 6b, the microstructure 1031 is an elliptical arc microstructure; as shown in fig. 6c, the microstructure 1031 is a parabolic microstructure; as shown in fig. 6d, the microstructure 1031 is a linear microstructure; the microstructures 1031 may be provided in other shapes in addition to the above four cases.
To explain further, the overall shape of the microstructure 1031 may have a certain center, such as a circular arc microstructure shown in fig. 6a, an elliptical arc microstructure shown in fig. 6b, or a parabolic microstructure shown in fig. 6c, which may be set within the size range of the projection screen or outside the size range of the projection screen; the overall shape of the microstructures 1031 may also be linear microstructures having no center as shown in fig. 6d, and the linear microstructures may be arranged in the horizontal direction as shown in fig. 6d, in the vertical direction, or in a certain inclined angle.
Further, a cross section of the microstructure 1031 in the thickness direction of the projection screen may be a shape formed by connecting at least three line segments end to end, may be a shape formed by connecting at least two curves end to end, and may be a shape formed by connecting at least one line segment and at least one curve end to end; that is, the cross section of the microstructure 1031 in the thickness direction of the projection screen is similar to the cross section of the cylindrical microlens in the lateral direction of the projection screen.
The projection screen of the embodiment of the invention and the projection screen in the prior art are tested, and the specific test process is as follows:
FIG. 7 is a diagram illustrating a test of the diffusion capability of the projection screen to the light intensity according to an embodiment of the present invention. A rectangular projection screen is used as a sample 1, and the projection screen in this embodiment is used as the sample 1. Taking 9 test points from the sample 1, namely, a test point, a test. The four-point horizontal line testing method comprises the following steps of firstly, secondly, thirdly on the same horizontal line, fourthly, fifthly and sixthly on the same horizontal line, and seventhly, wherein the center axis Z is the center, the distances between the six testing point positions of the seventh, seventeenth, sixteenth and the line segment at the extreme edge are 1/6 of the corresponding side length, and the seventh, the fifteenth and the fifteenth are positioned on the center axis Z, wherein the fifteenth is positioned at the center of the whole sample 1. The specific test method comprises the following steps: the projector Y with oblique incidence is used for projecting light to be incident on the sample 1, the luminance meter M is positioned at the position 3 meters 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 prior art projection screen of exactly the same size as sample 1 was taken as sample 2 and marked 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 projected by the projector Y at each position is an uneven state of bright in the middle and dark at both sides, so that the sample 1 (the projection screen of this embodiment) can improve the problem of uneven brightness of the light source itself, and obtain an even brightness display effect.
A comparison graph of the light intensity diffusing capability of the projection screen in the present embodiment (sample 1) and the projection screen of the related art (sample 2) as shown in fig. 8 can be obtained from the data of table 1. It can be seen from fig. 8 and table 1 that after the projection screen (sample 2) of the prior art diffuses the light intensity, the problem of uneven brightness in the middle and dark edge is obvious, because the diffusing capacities of the columnar microlenses arranged in succession and having the same size at all positions in the transverse direction are similar, and the tendency of uneven brightness existing in the columnar microlenses 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 projection screen. In addition, the technical scheme of the invention can well optimize the problem of uneven brightness of the projector and obtain better brightness uniformity effect by matching with each other.
Example two
On the basis of the first embodiment, as shown in fig. 9, diffusing particles and/or light absorbing materials are disposed on the pillar microlens layer.
As shown in fig. 9a, diffusing particles 1034 are disposed in the cylindrical microlenses 1011 of the cylindrical microlens layer, and these diffusing particles 1034 can uniformly scatter the light passing through the inside of the cylindrical microlenses, thereby further making the light intensity distribution 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, and the like, and the particle diameter thereof is preferably 5nm to 200 nm. It should be noted that the cylindrical microlens of the present invention mainly depends on the change of the lens structure itself to realize the diffusion regulating function for light, so that no diffusion particles may be provided in the cylindrical microlens, and a good light diffusion effect can be obtained. When the diffusion particles 1034 are provided in the columnar microlenses 1011, the diffusion particles 1034 may be uniformly distributed in the columnar microlenses 1011 or may be non-uniformly distributed in the columnar microlenses 1011, and in order to achieve the best effect, it is preferable that the diffusion particles 1034 be uniformly distributed in the columnar microlenses 1011.
As shown in fig. 9b, a light absorbing material 1035 is disposed in the cylindrical microlens 1011 of the cylindrical microlens layer, and the light absorbing material 1035 can absorb some unwanted light and selectively transmit the wanted light. Here, the light absorbing material 1035 includes, but is not limited to, various pigments, dyes, or carbon black, black iron oxide, etc., and functions to filter and shade light. It should be noted that the light absorbing material may not be disposed in the cylindrical microlens according to different application scenarios.
As shown in fig. 9c, the diffusion particles 1034 and the light absorbing material 1035 are disposed in the cylindrical microlenses 1011 of the cylindrical microlens layer, so that the functions of light uniformization, filtering and color matching can be achieved, and the display device has a very good effect in display applications.
As a further supplementary note, diffusion particles 1034 and/or light-absorbing materials 1035 may also be added to the first substrate layer 102; diffusing particles 1034 and/or light absorbing materials 1035 may also be added to the reflective microstructure layer 103 to further enhance the light homogenizing and filtering toning effects.
As a further supplementary note, a reflective layer having a specular reflection function or a diffuse reflection function may be disposed on a side of the reflective micro-structure layer 103 away from the lenticular micro-lens layer 101, that is, the reflective layer may be a specular reflective layer or a diffuse reflective layer.
EXAMPLE III
The difference between the projection screen of the present embodiment and the first embodiment is: referring to the top view of the projection screen structure shown in fig. 10, a surface of the lenticular microlens layer 101 on a side away from the first substrate layer 102 is a rough surface 1012, and the rough surface 1012 is formed by roughening a cylindrical surface of the lenticular microlens 1011 of the lenticular microlens layer 101. Here, the rough surface 1012 may be formed by transferring or spraying a glue having diffusion particles by using a glue after a sand blast process or a mold surface roughening process. The rough surface 1012 can further diffuse light, and functions in light evening, hardening protection and imaging.
Example four
The difference between the projection screen of the present embodiment and the third embodiment is that: referring to the top view of the projection screen structure shown in fig. 11, a rough surface 1012 is formed on a surface of the first substrate layer 102 on a side close to the lenticular microlens layer 101, and a forming manner of the rough surface 1012 is described in detail in the third embodiment, and is not described again here. The rough surface is arranged on the surface of the first substrate layer 102, so that the light diffusion capability of the projection screen is further enhanced.
As a further supplementary description, the other side surface of the first substrate layer 102 may be a rough surface, that is, the other side surface of the first substrate layer 102 may be subjected to a roughening treatment, so as to further enhance the light-equalizing capability of the projection screen.
EXAMPLE five
Refer to fig. 12 for a top view of a projection screen configuration. The projection screen 10 comprises a first substrate layer 102, a columnar microlens layer 101, a filling resin material layer 105 and a reflection microstructure layer 103 which are sequentially arranged along the thickness direction of the projection screen; the surface of the first substrate layer 102 on the side away from the lenticular microlens layer 101 is a rough surface 1012, the forming manner of the rough surface 1012 has been described in detail in the third embodiment, and details are not repeated here, and the rough surface 1012 can diffuse light to play a role in homogenizing, hardening protection and imaging; the filling resin material layer 105 is used to fill up the lenticular microlens layer 101.
Further, the refractive index of the material of the columnar microlens layer 101 is different from that of the material of the filling resin material layer 105, and the refractive index of the material of the columnar microlens layer 101 is defined as n1The refractive index of the material of the filling resin material layer 105 is n2Then n is1≠n2. By providing the materials with different refractive indexes of the columnar microlens layer 101 and the filling resin material layer 105, light is refracted at the interface between the columnar microlens layer 101 and the filling resin material layer 105, and when the refractive index difference is larger, the diffusion capability of the columnar microlens layer 101 is stronger. The refractive indexes of the materials of the lenticular lens layer 101 and the filling resin material layer 105 may be set according to the actual viewing field requirement, so as to adjust the diffusion viewing angle of the lenticular lens layer 101.
The features of the lenticular microlens layer 101, the first substrate layer 102, and the reflective microstructure layer 103 in this embodiment are similar to those of the corresponding structures in the first embodiment, and the design of the lenticular microlens layer 101, the first substrate layer 102, and the reflective microstructure layer 103 can refer to the description in the first embodiment, and will not be repeated here.
As a further supplementary explanation, diffusing particles and/or light absorbing materials may also be added to first substrate layer 102; diffusing particles and/or light absorbing materials may also be added to the reflective microstructure layer 103; diffusing particles and/or light absorbing materials may also be added to the filled resin material layer 105 to further enhance the light homogenizing and filtering toning effects.
EXAMPLE six
The difference between the projection screen of the present embodiment and the projection screen of the fifth embodiment is: referring to the top view of the projection screen structure shown in fig. 13, a surface of the lenticular microlens layer 101 on a side away from the first substrate layer 102 is a rough surface 1012. The rough surface 1012 is formed by roughening the cylindrical surface of the cylindrical microlens 1011 of the cylindrical microlens layer 101. Here, the rough surface 1012 may be formed by transferring or spraying a glue having diffusion particles by using a glue after a sand blast process or a mold surface roughening process. The rough surface 1012 can further diffuse light, and functions in light evening, hardening protection and imaging.
EXAMPLE seven
The difference between the projection screen of the present embodiment and the projection screen of the fifth embodiment is: referring to the top view of the projection screen structure shown in fig. 14, the projection screen 10 further includes a second substrate layer 104, and the second substrate layer 104 is disposed between the leveling resin material layer 105 and the reflective microstructure layer 103.
As a further supplementary note, the second substrate layer 104 may be made of a material including, but not limited to, flexible plastic or rubber material such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, casein phosphopeptide, biaxial polypropylene, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer, or a transparent substrate having a certain rigidity such as glass, acryl, ceramic, etc.
Further, the second substrate layer 104 can be colored by a gray dye/pigment, so that the transmittance of the second substrate layer 104 is properly reduced, the overall appearance color of the projection screen is adjusted, the absorption of ambient light is increased, and the contrast of the projection screen is improved.
As a further supplement, diffusing particles and/or light absorbing materials may also be added to second substrate layer 104 to further enhance the light homogenizing and filtering toning effects.
Example eight
The present embodiment differs from the projection screen of the seventh embodiment in that: referring to the top view of the projection screen structure shown in fig. 15, the surface of the second substrate layer 104 on the side away from the reflective microstructure layer 103 is a rough surface 1012. Here, the rough surface 1012 may be formed by transferring or spraying a glue having diffusion particles by using a glue after a sand blast process or a mold surface roughening process. The rough surface 1012 can further diffuse light, and functions in light evening, hardening protection and imaging.
As a further supplementary description, the other side surface of the second substrate layer 104 may be a rough surface, that is, the other side surface of the second substrate layer 104 may be subjected to a roughening treatment, so as to further enhance the light-uniformizing capability of the projection screen.
Example nine
The present embodiment differs from the projection screen of the seventh embodiment in that: referring to the top view of the projection screen structure shown in fig. 16, a reflective layer 106 is disposed on a side of the reflective microstructure layer 103 away from the lenticular microlens layer 101. The reflective layer 106 has a specular reflection function or a diffuse reflection function, that is, the reflective layer 106 may be a specular reflective layer or a diffuse reflective layer. Both specular and diffuse reflective layers are capable of reflecting light, with the following differences: the surface of the mirror reflection layer is smooth like a mirror surface, and reflected light and incident light meet the optical reflection theorem, so that clear images can be formed, and the mirror reflection layer can be generally manufactured in an electroplating mode; the diffuse reflection layer has a rough surface, reflected light is transmitted to all directions without regularity, clear images cannot be formed, and the diffuse reflection layer is generally manufactured by printing and spraying.
As a supplementary further illustration, the reflective layer 106 may be configured to have a certain light transmittance, so that the ambient light entering the inside of the projection screen can pass through the reflective layer, so that the ambient light is not reflected to the viewing area, which is very effective in improving the contrast of the projection screen.
Furthermore, a pigment/dye capable of emitting red, green and blue light and absorbing/transmitting visible light of other colors can be added into the reflective layer 106 to absorb more ambient light and improve the contrast of the projection screen.
Example ten
The difference between the projection screen of this embodiment and the projection screen of the ninth embodiment is that: referring to the top view of the projection screen structure shown in fig. 17, the projection screen 10 further includes a black back plate 107 and a decorative frame 108, the black back plate 107 is disposed on a side of the reflective layer 106 away from the lenticular layer 101, and the decorative frame 108 wraps the periphery of the projection screen. The black back plate 107 can be closely attached to the reflective layer 106 through a double-sided adhesive tape or an EVA hot melt adhesive, and a black paint can be disposed on the surface of the black back plate 107 to absorb unnecessary light incident on the black back plate, so that the contrast of the projection screen can be properly improved. The decorative frame 108 is installed around the black back plate 107 and surrounds each layer structure of the projection screen in the thickness direction of the projection screen to fix and beautify the appearance of the projection screen and to form a projection viewing area by segmentation. The decorative outer frame 108 and the black back plate 107 can be fixed by double-sided adhesive tape or by screws/bolts.
EXAMPLE eleven
The projection screen of the present embodiment differs from that of the tenth embodiment in that: referring to the top view of the projection screen structure shown in fig. 18, the projection screen 10 further includes a hanging member 109 disposed on a side of the black back plate 107 away from the cylindrical microlens layer 101, and the hanging member 109 is fixed at a corresponding position of the black back plate 107 by double-sided adhesive or screw fixation, so as to facilitate subsequent mounting of the projection screen on a wall surface.
As a further supplementary description, the hanging member 109 may be replaced with a magnetic material so as to mount the projection screen on the wall surface by magnetic attraction, thereby ensuring the aesthetic property of the wall surface.
Example twelve
Referring to fig. 19, a schematic diagram of the optical path transmission in the top view direction of the projection system is shown. The projection system 20 comprises a projector Y and a projection screen, the projection screen comprises a first substrate layer 102, a cylindrical microlens layer 101, a filling resin material layer 105 and a reflection microstructure layer 103 which are sequentially arranged along the thickness direction of the projection screen, and the surface of one side, away from the cylindrical microlens layer 101, of the first substrate layer 102 is a rough surface. The features of the first substrate layer 102, the lenticular microlens layer 101, the leveling resin material layer 105, and the reflective microstructure layer 103 in the projection screen have been described in detail in the foregoing embodiments, and will not be repeated here.
Incident light G emitted by the projector Y passes through the first substrate layer 102, the columnar microlens layer 101, the filling resin material layer 105 and the reflective microstructure layer 103 in sequence, is finally reflected by the reflective microstructure layer 103, and then exits to the viewing range through the filling resin material layer 105, the columnar microlens layer 101 and the first substrate layer 102 in sequence. The display brightness uniformity of the projector can be greatly improved by using the projection screen, and the whole projection system has extremely high brightness display uniformity.
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 (13)
1. A projection screen comprises a columnar micro-lens layer (101), a first substrate layer (102) and a reflection micro-structural layer (103), wherein the columnar micro-lens layer (101) is arranged along the thickness direction of the projection screen and is arranged on one side of the first substrate layer (102), and the projection screen is characterized in that:
the columnar microlens layer (101) comprises a plurality of columnar microlenses (1011) which are vertically arranged, the height-width ratio of the columnar microlenses (1011) which are arranged along the transverse direction of the projection screen (10) towards two ends is gradually reduced by taking the central axis (Z) of the columnar microlens layer (101) as a reference, the central axis (Z) is the symmetry axis of the columnar microlenses (1011) with the maximum height-width ratio, and the height-width ratio is the height of the columnar microlenses (1011)/the width of the columnar microlenses (1011);
the reflecting microstructure layer (103) is provided with a plurality of microstructures (1031), and the microstructures (1031) are arc-shaped, parabolic, elliptical or linear.
2. A projection screen according to claim 1, characterised in that the cross-section of the lenticular microlenses (1011) in the transverse direction of the projection screen (10) is of at least three line segments end to end or of at least two curves end to end or of at least one line segment and at least one curve end to end.
3. A projection screen according to claim 1, characterized in that the microstructure (1031) has a cross-section in the thickness direction of the projection screen of at least three line segments connected end to end or of at least two curves connected end to end or of at least one line segment and at least one curve connected end to end.
4. A projection screen according to claim 1 wherein diffusing particles (1034) are disposed within the columnar microlenses (1011).
5. A projection screen according to claim 1, wherein a light absorbing material (1035) is provided within the cylindrical microlenses (1011).
6. A projection screen according to claim 1, wherein the reflective microstructure layer (103) is disposed on a side of the first substrate layer (102) remote from the lenticular layer (101), and a surface of the lenticular layer (101) remote from the first substrate layer (102) is roughened (1012).
7. A projection screen according to claim 1, wherein the surface of the first substrate layer (102) on the side away from the lenticular microlens layer (101) is rough (1012); one side, far away from the first base material layer (102), of the columnar microlens layer (101) is provided with a filling resin material layer (105) for filling the columnar microlens layer (101), and the reflection microstructure layer (103) is connected with the columnar microlens layer (101) through the filling resin material layer (105).
8. A projection screen according to claim 7 wherein the surface of the lenticular layer (101) on the side remote from the first substrate layer (102) is roughened (1012).
9. A projection screen according to claim 7 further comprising a second substrate layer (104), said second substrate layer (104) being disposed between said layer of filled resin material (105) and said reflective microstructure layer (103).
10. A projection screen according to claim 7, characterised in that the side of the reflective micro-structured layer (103) remote from the lenticular micro-lens layer (101) is provided with a reflective layer (106) having a specular or diffuse reflecting function.
11. A projection screen according to claim 10, further comprising a black back plate (107) and a decorative frame (108), wherein the black back plate (107) is disposed on a side of the reflective layer (106) away from the lenticular layer (101), and the decorative frame (108) wraps around the projection screen (10).
12. A projection screen according to claim 11, further comprising a magnetic material or suspension (109) disposed on a side of the black back plate (107) remote from the lenticular layer (101).
13. A projection system comprising a projector and a projection screen according to any one of claims 1 to 12.
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| CN202011099621.1A CN111929977A (en) | 2020-10-15 | 2020-10-15 | Projection screen and projection system |
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| CN202011099621.1A CN111929977A (en) | 2020-10-15 | 2020-10-15 | Projection screen and projection system |
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| CN116158279A (en) * | 2023-03-10 | 2023-05-26 | 中国农业科学院都市农业研究所 | Wide-range light-emitting device meeting animal and plant lighting requirements |
| WO2023125103A1 (en) * | 2021-12-31 | 2023-07-06 | 嘉兴驭光光电科技有限公司 | Micro-optical lens, preparation method therefor, and display system |
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