CN111948889A - Light control device, passive light-emitting image source, projection curtain and system - Google Patents

Light control device, passive light-emitting image source, projection curtain and system Download PDF

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CN111948889A
CN111948889A CN201910414504.0A CN201910414504A CN111948889A CN 111948889 A CN111948889 A CN 111948889A CN 201910414504 A CN201910414504 A CN 201910414504A CN 111948889 A CN111948889 A CN 111948889A
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light
reflecting
optical axis
main optical
control element
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徐俊峰
方涛
吴慧军
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Future Beijing Black Technology Co ltd
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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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • 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
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • 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

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  • General Physics & Mathematics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention provides a light control device, a passive light-emitting image source, a projection curtain and a system, wherein the device comprises: a main optical axis control element and a dispersion element; the main optical axis control element is used for reflecting the multiple paths of light rays emitted by the light source to the same position; the dispersion element is arranged on one side of the main optical axis control element close to the light source and between the main optical axis control element and the light source, and the dispersion element is used for dispersing reflected light of the main optical axis control element and forming light spots. By the light control device, the passive light-emitting image source, the projection curtain and the system, incident light rays with different incident angles can be converged to the same position through the main optical axis control element, so that the light brightness can be improved; simultaneously, diffuse light through the dispersion element to can form the facula of predetermineeing the shape, make things convenient for follow-up formation of image in the facula scope, when improving light luminance, can also enlarge the formation of image scope.

Description

Light control device, passive light-emitting image source, projection curtain and system
Technical Field
The invention relates to the technical field of display imaging, in particular to a light control device, a passive light-emitting image source, a projection curtain and a system.
Background
The Light source is an object that can emit electromagnetic waves (e.g., visible Light, ultraviolet Light, infrared Light, etc.) in a certain wavelength range, such as an LED (Light Emitting Diode); in the fields of illumination, display imaging and the like, a light source is an indispensable device.
The existing devices (such as lighting devices, liquid crystal displays and the like) including light sources simply utilize light emitted by the light sources, and the light sources are generally point light sources or approximate point light sources, namely, the light sources can emit light to the periphery, and the utilization rate of the traditional light source devices to the light sources is low.
In particular, when some display imaging devices (e.g., liquid crystal displays) perform imaging using a backlight, only a small portion of light emitted from the backlight is used for imaging, resulting in low imaging brightness. Although the problem of low imaging brightness can be solved by increasing the power of the light source, the problem of high power consumption and large heat generation of the light source is correspondingly brought, so that the heat dissipation requirement of the light source device is increased.
Disclosure of Invention
To solve the above problems, embodiments of the present invention provide a light control device, a passive light-emitting image source, a projection curtain and a system.
In a first aspect, an embodiment of the present invention provides a light control device, including: a main optical axis control element and a dispersion element;
the main optical axis control element is used for reflecting multiple paths of light rays emitted by the light source to the same position;
the dispersion element is arranged on one side, close to the light source, of the main optical axis control element and is arranged between the main optical axis control element and the light source, and the dispersion element is used for diffusing reflected light of the main optical axis control element and forming light spots.
In a second aspect, an embodiment of the present invention further provides a passive light-emitting image source, including a light source and the light control device as described above;
the light control device is separated from the light source and used for reflecting the light emitted by the light source to a preset range.
In a third aspect, an embodiment of the present invention further provides a projection curtain, including any one of the light ray control devices described above.
In a fourth aspect, an embodiment of the present invention further provides a projection system, including a projector and the projection curtain described above;
the projection curtain with the projecting apparatus separation sets up, the projection curtain is used for with light reflection to predetermineeing the within range that the projecting apparatus sent.
In the solution provided by the first aspect of the embodiments of the present invention, the incident light beams with different incident angles can be converged to the same position by the main optical axis control element, so that the light brightness can be improved; simultaneously, diffuse light through the dispersion element to can form the facula of predetermineeing the shape, make things convenient for follow-up formation of image in the facula scope, when improving light luminance, can also enlarge the formation of image scope.
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
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view showing a first structure of a light control device provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram illustrating a light ray control device having a discrete reflection structure provided in embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a light control device having a continuous reflective structure according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view showing a continuous type reflection structure in the optical line control apparatus provided in embodiment 1 of the present invention;
fig. 5 is a schematic view showing a light control apparatus according to embodiment 1 of the present invention, in which light from multiple light sources is reflected;
fig. 6 is a schematic view showing a second structure of the light control device provided in embodiment 1 of the present invention;
fig. 7a is a schematic diagram illustrating a first structure of a passive light-emitting image source provided in embodiment 2 of the present invention;
fig. 7b is a schematic diagram illustrating a second structure of the passive light-emitting image source according to embodiment 2 of the present invention.
Reference numerals: 104-light source, 106-diffusion element, 107-collimation element, 109-main optical axis control element, 1061-light spot, 1062-focusing position, 1091-reflection structure, 100-light control device, 700-reflection device, 2600-substrate, 2602-protection unit.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
Based on the same inventive concept, the present embodiment also provides a light ray control device, as shown in fig. 1, a main optical axis control element 109 and a dispersion element 106.
The main optical axis control element 109 is configured to reflect the multiple light beams emitted by the light source 104 to the same position, i.e. the preset position 1062. The dispersion element 106 is arranged on the side of the main optical axis control element 109 close to the light source 104, and is arranged between the main optical axis control element 109 and the light source 104; the dispersion element 106 is used to disperse the reflected light of the main optical axis control element 109 and form a light spot 1061 in a predetermined shape.
Specifically, as shown in fig. 1, the light ray a emitted from the light source 104 passes through the diffusion element 106 and then is emitted to the main optical axis control element 109; the diffusion element 106 performs a first diffusion on the light ray a, and the process of the first diffusion is not illustrated in fig. 1 for convenience of description. The main optical axis control element 109 then reflects the incident light ray a; as shown in fig. 1, in the absence of the dispersing element 106, the light ray a may be directed along the optical path a to a preset position 1062; after the diffusion element 106 is disposed outside the main optical axis control element 109, the diffusion element 106 performs a second diffusion to diffuse the light ray a into a plurality of light rays (including the light ray a1, the light ray a2, and the like) and disperse the light rays into a range, that is, the light spot 1061 is formed, so that an observer can view an image of the image source within the range of the light spot 1061.
Alternatively, the predetermined shape of the spot includes, but is not limited to, a circle, an ellipse, a square, a rectangle, a batwing shape. In the present embodiment, the size of the light spot 1061 is determined by two dispersions, the shape of the light spot 1061 is determined by the shape of the dispersion element 106, and fig. 1 illustrates a rectangular light spot as an example. The preset position 1062 may be a point, or may be an area range, that is, the main optical axis control element 109 may converge the light emitted from the light source 104 into the range. The diffusion angle of the diffused light spot in the side view direction can be 10 degrees, and preferably 5 degrees; the dispersion angle in the front view direction may be 50 degrees, preferably 30 degrees.
The dispersive element 106 includes, but is not limited to, a Diffractive Optical Element (DOE), such as a Beam Shaper (Beam Shaper), which disperses light after passing through the Diffractive Optical element and forms a spot of a specific geometry, the size and shape of which is determined by the microstructure of the Diffractive Optical element.
The diffusion element 106 is used for controlling the diffusion degree of the light, and the light controlled by the main optical axis is diffused at a certain angle, so that the required eye box area can be covered. The final imaging brightness and the visual angle are determined by the spread angle and the spot size of the light after dispersion, and the smaller the dispersion angle is, the higher the imaging brightness is, and the smaller the visual angle is; and vice versa.
According to the light ray control device provided by the embodiment, incident light rays with different incident angles can be converged to the same position through the main optical axis control element, so that the light ray brightness can be improved; simultaneously, diffuse light through the dispersion element to can form the facula of predetermineeing the shape, make things convenient for follow-up formation of image in the facula scope, when improving light luminance, can also enlarge the formation of image scope. In addition, the light source can provide light with enough brightness without high power, so that the heat dissipation requirement of the equipment with the light source can be reduced.
On the basis of the above embodiments, the main optical axis control element 109 includes a plurality of reflective structures, the reflective structures are used for reflecting one or more incident light beams emitted from the light source 104 to a predetermined position, and the size of the reflective structures is smaller than a predetermined size. In this embodiment, the reflective structures are all microstructures, and the size of the reflective structure refers to one or more of length, width, radius, and area. Wherein the predetermined sizeThe value of (b) is specifically determined according to actual requirements, for example, the preset size (including the preset length, the preset width, the preset area, etc.) is 1cm, 0.5mm, 10 μm, etc., or the preset size (such as the preset area) is 1mm2This embodiment is not limited to this. Multiple paths of light can be reflected to the same preset position 1062 by the micro-reflective structures.
In this embodiment, the reflective structure is a discrete structure, that is, the main optical axis control element 109 includes a plurality of discrete micro reflective structures, each of which is similar to a micro mirror and can reflect a light beam emitted from the light source 104 to a predetermined position. In this embodiment, the one-path light refers to light with the same incident angle or the incident angle within a predetermined range.
The plane of each reflecting structure is determined by the position of the light source, the preset position to which the incident light is reflected and the position of the reflecting structure. Specifically, fig. 2 illustrates one reflective structure 1091 in the main optical axis control element 109. In FIG. 2, the light source 104 is located at a position P1The predetermined position 1062 is a point P2. For the reflecting structure 1091, the normal (i.e., the dashed line in fig. 2) thereof is perpendicular to the plane of the reflecting structure 1091, i.e., the normal is the perpendicular vector of the plane of the reflecting structure. In the space coordinate system, the vertical vector is:
Figure BDA0002063905780000061
meanwhile, the incident angle and the exit angle of the incident light of the reflecting structure 1091 are the same, let M in fig. 20(x0,y0,z0) Is a known point on the reflecting structure, the perpendicular vector is then located at the vector
Figure BDA0002063905780000062
And
Figure BDA0002063905780000063
on the bisector of the angle (c), so:
Figure BDA0002063905780000064
at the same time, since M0Is a point of known coordinates on the reflecting structure, the vector is calculated for any point M (x, y, z) on the reflecting structure
Figure BDA0002063905780000065
Perpendicular to the vector
Figure BDA0002063905780000066
Then
Figure BDA0002063905780000067
Namely:
P⊥,x(x-x0)+P⊥,y(y-y0)+P⊥,z(z-z0)＝0 (2)
thus, for a discrete reflective structure 1091, the reflective surface of the reflective structure 1091 (i.e., the plane in which the reflective structure lies) can be defined by the normal vector
Figure BDA0002063905780000068
And a known point M on the reflecting surface0To be determined. Meanwhile, the reflecting structure is a microstructure, that is, only the point (x, y, z) of the reflecting structure needs to be determined in a very small value range, that is, the point (x, y, z) on the reflecting structure satisfies the following equation in the corresponding value range:
Figure BDA0002063905780000069
wherein, P1Is the coordinate of the position of the light source, P2As coordinates of a predetermined position, M0(x0,y0,z0) Being the coordinates of a known point on the reflecting structure,
Figure BDA0002063905780000071
normal vector, P, representing reflecting structure⊥,x、P⊥,y、P⊥,zRespectively represent normal vectors
Figure BDA0002063905780000072
Components in the x, y and z axes.
For each of the reflective structures 1091 of the primary optical axis control element 109, a known point on each reflective structure may be determined, in combination with the position P of the light source 1041And a preset position P2The normal vector of each reflecting structure can be determined, thereby determining the reflecting surface of each reflecting structure. Wherein the known point M0The center point of the reflection structure, or a point on an intersection line of the reflection structure and the plane of the main optical axis control element 109, or other preset points on the reflection structure 1091, which is not limited in this embodiment.
Meanwhile, the value range of the point (x, y, z) may be specifically:
Figure BDA0002063905780000073
wherein x1,x2,y1,y2,z1,z2Is a preset value determined according to the placing positions of the reflecting structures, and x corresponding to different reflecting structures1,x2,y1,y2,z1,z2The values of (A) are not all the same. For example, for the x-axis, if the x-component of the location of a reflective structure is between 1 and 1.5, then for that reflective structure, x1＝1,x21.5; if the x-component of the position of the further reflective structure lies between 1.5 and 1.9, then for the further reflective structure x1＝1.5,x21.9. Wherein, the meaning of the numerical values not being completely the same is: for six values of x1,x2,y1,y2,z1,z2The six values corresponding to two different reflecting structures are not completely the same, i.e. at least 1 or even all of the six values are different.
Or based on a known point M on the reflecting structure0(x0,y0,z0) To define a reflecting structureThe value range of all points (x, y, z) may be:
Figure BDA0002063905780000074
wherein Δ x1,Δx2,Δy1,Δy2,Δz1,Δz2Is a predetermined value determined based on the size of the reflecting structure, and different reflecting structures can use the same Δ x1,Δx2,Δy1,Δy2,Δz1,Δz2Different values may also be selected based on the actual situation. For example, Δ x1＝0.5,Δx2When the value is equal to 0.4, M is determined0(x0,y0,z0) After the position of (2), if x0The x component of the position of the reflective structure has a value in the range of [2.5,3.4 ═ 3]. Wherein the smaller the size of the reflecting structure, the corresponding Δ x1,Δx2,Δy1,Δy2,Δz1,Δz2The smaller the value of (a).
In a possible implementation manner, the reflecting structure in this embodiment is a continuous structure, that is, the main optical axis control element 109 includes a plurality of continuous reflecting structures, and each of the reflecting structures is used for reflecting multiple light rays emitted from the light source 104 to a preset position.
Specifically, the reflecting structure is a continuous free-form surface, and an included angle between the free-form surface and a plane where the main optical axis control element 109 is integrally located is a fixed value θ. Referring to fig. 3, the upper half of fig. 3 shows a schematic view of a front view of the light control device, and the lower half shows a schematic view of a top view of the light control device. Wherein, the reflecting structure 1091 intersects with the main optical axis control element 109, and the intersecting line is a free curve, i.e. the midpoint M and the point M at the lower half of fig. 30The curve in which it lies.
In this embodiment, a known point M on the intersection line of the reflection structure and the main optical axis control element 109 is preset first0And M is0Has the coordinates of (x)0,y0,z0). Similar to the embodiment of FIG. 2, the light source 104 is locatedPosition P1The predetermined position 1062 is a point P2. For the reflective structure 1091, since the reflective structure 1091 is a free form surface, it does not have a unique normal, but at a known point M0Normal to the reflecting structure 1091
Figure BDA0002063905780000081
Comprises the following steps:
Figure BDA0002063905780000082
and is
Figure BDA0002063905780000083
Meanwhile, for the plane of the main optical axis control element 109, the normal vector of the plane is set
Figure BDA0002063905780000084
Is (A, B, C), i.e.
Figure BDA0002063905780000085
A. B, C denote normal vectors
Figure BDA0002063905780000086
Components in the x, y and z axes. According to the geometric relationship, the normal vector
Figure BDA0002063905780000087
From the normal
Figure BDA0002063905780000088
The included angle between the reflection structure 1091 and the plane of the main optical axis control element 109 is the included angle θ. So that the normal vector of the plane of the main optical axis control element 109 is determined
Figure BDA0002063905780000089
And the reflective structure 1091 is at point M0Normal to
Figure BDA00020639057800000810
Can ensureAnd an included angle theta is determined. That is to say that the first and second electrodes,
Figure BDA00020639057800000811
according to the vector quantity product formula, the following formula is obtained:
Figure BDA00020639057800000812
therefore, the included angle θ between the reflection structure and the plane of the main optical axis control element 109 satisfies:
Figure BDA0002063905780000091
wherein the content of the first and second substances,
Figure BDA0002063905780000092
a normal vector representing the plane of the main optical axis control element 109; p1Is the coordinate, P, of the location of the light source 1042As coordinates of preset position 1062, M0(x0,y0,z0) Is the coordinate of a known point on the plane of intersection of the reflecting structure 1091 and the primary optical axis control element 109,
Figure BDA0002063905780000093
indicating that the reflecting structure 1091 is at point M0The normal vector of (c).
After the included angle θ is determined, the intersection line between the reflecting structure 1091 and the plane of the main optical axis control element 109 (i.e., the point M at the bottom half of FIG. 3 and the point M at the point M)0The curve on which) the free form surface of the reflecting structure 1091 can be determined.
Specifically, referring to fig. 3, for any point M (x, y, z) on the intersection line of the reflection structure 1091 and the plane of the main optical axis control element 109, the point M is located in the plane of the main optical axis control element 109, so:
A(x-x0)+B(y-y0)+C(z-z0)＝0 (6)
meanwhile, the reflection structure 1091 normal vector at point M
Figure BDA0002063905780000094
Is composed of
Figure BDA0002063905780000095
And the normal vector
Figure BDA0002063905780000096
Normal vector of the plane of the main optical axis control element 109
Figure BDA0002063905780000097
The included angle therebetween is also theta, so
Figure BDA0002063905780000098
In addition, a preset value range exists on the plane where the main optical axis control element 109 is located, so that a point M (x, y, z) on an intersection line of the reflection structure and the plane where the main optical axis control element 109 is located meets the following equation within the preset value range:
Figure BDA0002063905780000101
wherein the content of the first and second substances,
Figure BDA0002063905780000102
representing the normal vector of the reflecting structure at point M. The preset value range of the point M (x, y, z) may specifically be:
Figure BDA0002063905780000103
wherein x isv,xu,yv,yu,zv,zuRespectively, are boundary values for the size of the main optical axis control element 109.
In this embodiment, the reflection structure is a continuous free-form surface, and the free-form surface of the reflection structure can be accurately determined by using the fixed included angle θ between the reflection structure and the main optical axis control element and the intersection line between the reflection structure and the main optical axis control element. At the same time, for other reflecting structures, another known point M can be redetermined0And determining the corresponding included angle theta and the intersection line. Different reflection structures have different included angles theta, and the intersection lines between the reflection structures and the main optical axis control element are different. For the main optical axis control element 109, different forms of intersection are distributed on its plane. Referring to fig. 4, the two reflective structures correspond to different angles θ1And theta2And the two included angles correspond to the tracks L of different intersecting lines1And L2。
Meanwhile, after the included angle and the intersection line of the continuous reflection structure are determined, when the reflection structure on the main optical axis control element 109 is manufactured and processed, the included angle can be fixed by a processing machine, and then the reflection structure is processed along the track of the intersection line, so that the processing technology is simple; meanwhile, if the processing depth (or the height) of the reflecting structure is the same, the included angle theta of the reflecting structure is fixed, so that the distance between two adjacent intersecting lines is also a fixed value, and the distribution of the reflecting structure is more uniform.
Furthermore, it will be understood by those skilled in the art that the plane in which the main optical axis control element 109 is located can be set to be the xoy plane of the three-dimensional coordinate system to simplify the calculation process.
On the basis of the above embodiment, the reflection structure includes N reflection surfaces, and different reflection surfaces are used for reflecting one or more paths of incident light rays emitted by different N light sources 104 to the same preset position; or
The different reflecting surfaces are used for reflecting one or more paths of incident light rays emitted by the different N light sources 104 to N different preset positions.
In this embodiment, the reflection structure may be a three-dimensional structure, so that a plurality of reflection surfaces may be provided for the reflection structure, and different reflection surfaces are used for reflecting light rays emitted by different light sources 104. By setting the orientation of the reflective surface of the reflective structure, light emitted by different light sources 104 can be reflected to the same preset position, and also can be reflected to different positions.
Referring to fig. 5, S1 and S2 in fig. 5 indicate different light sources, and the reflecting structure 1091 has two reflecting surfaces and reflects the light emitted from the two light sources to different positions. As shown in fig. 5, the light emitted from the light source S1 is converged to the left eye position after passing through the reflecting structure 1091, and the light emitted from the light source S2 is converged to the right eye position after passing through the reflecting structure 1091, so that different images are emitted by the light source S1 and the light source S2 to be displayed on the left and right eyes of the observer, thereby allowing the observer to observe a 3D image. Furthermore, as will be appreciated by those skilled in the art, the left eye and the right eye in fig. 5 only represent two different positions, and when the distance between the two positions is large enough, a box-of-eye region can be formed at each position, which is convenient for two observers to respectively view the images formed by S1 and S2. The eye box range refers to an area where an observer can observe an image presented by the light spot.
In addition to the above embodiments, referring to fig. 6, the light control device further includes a substrate 2600; the main optical axis control element 109 is disposed on the substrate 2600;
the substrate 2600 is located on a side of the main optical axis control element 109 remote from the dispersion element 106, and the main optical axis control element 109 is disposed on the substrate 2600.
Substrate 2600 may be, but is not limited to: flexible or non-flexible metallic materials, polymeric materials, fiberglass, textiles, and composites.
Referring to fig. 6, the light control apparatus further includes a protection unit 2602;
the protection unit 2602 is located on the side of the dispersion element 106 remote from the main optical axis control element 109, and the protection unit 2602 covers the dispersion element 106.
The protection unit 2602 is made of a transparent material and is used for protecting the light control device. Specifically, the protection unit 2602 may be a nano coating, a transparent resin coating, a polymer coating, or the like.
Example 2
Based on the same inventive concept, the present embodiment further provides a passive light-emitting image source, which is shown in fig. 7a and includes the light control device 100 and the light source 104 according to any of the above embodiments.
Specifically, the light emitted from the light source 104 is reflected and diffused by the light control device 100 to form the light spot 1061 with a preset shape. When the light source 104 is an imaging light source, an observer can see an image formed by the light source 104 at the spot 1061.
On the basis of the above embodiment, the passive light-emitting image source may include N light sources 104; the main optical axis control element 109 of the light control device 100 includes a plurality of reflective structures, and each reflective structure includes N reflective surfaces; each of the N reflecting surfaces is configured to reflect one or more incident light beams emitted by the N light sources 104 to N different preset positions.
Optionally, N is 2, that is, the passive light-emitting image source includes two light sources, and one light source 104 is configured to emit the first light, and the other light source 104 is configured to emit the second light; that is, the first light is light emitted from one light source, the second light is light emitted from another light source, and the first light and the second light are light emitted from two different light sources.
One reflecting surface of the reflecting structure is used for reflecting the first light to a first preset position, and the other reflecting surface of the reflecting structure is used for reflecting the second light to a second preset position; the distance between the first preset position and the second preset position is a preset distance, and the preset distance can be the distance between the positions of two observers or the distance between the left eye and the right eye of one observer.
On the basis of the above embodiment, the passive light-emitting image source further comprises a reflecting device 700; the structure of which is schematically shown in fig. 7 b.
The reflection device 700 is used for reflecting the light spots dispersed by the light control device 100, and the light spots form virtual images outside the reflection device. By means of the reflection device 700, light rays can be converged at an observation area where human eyes are located, and the reverse extension lines of the light rays form a virtual image.
The reflection device 700 may be, but is not limited to: transparent or non-transparent media with certain inclination angles, such as vehicle windshields, flat mirrors coated with opaque reflective layers, and transparent resin plates.
Based on the same inventive concept, the present embodiment further provides a projection curtain, which includes the light control device 100 according to any of the above embodiments.
In this embodiment, the light control device 100 in the projection curtain may be specifically the light control device in the embodiment shown in fig. 1 to 6. Taking fig. 1 as an example, the light control device 100 of the projection curtain includes a diffusion element 106 and a main optical axis control element 109; the light source 104 can be used as a projector, and when the projector (i.e., the light source 104) is fixed in a proper position, an image emitted by the projector is reflected by the projection screen and then only reflected to the range of the light spot 1061, that is, an observer can view an image projected on the projection screen only in the range of the light spot 1061, and an observer outside the light spot 1061 cannot view the image projected by the projector.
When a projector projects an image on a conventional curtain, the conventional curtain may be diffusely reflected, so that an observer can see the image on the curtain at any angle, but generally, only the observer at some position needs to watch the image on the curtain, such as an observer sitting at a middle position in front of the curtain. The projection curtain provided by the embodiment can efficiently reflect the image projected by the projector to a specific area, such as a middle seat of a conference room, a sofa of a living room, etc., through the main optical axis control element 109, so that the brightness of the curtain can be improved; meanwhile, the light reflected by the main optical axis control element 109 is dispersed by the dispersion element 106, so that an observer in the range of the light spot 1061 can view an image projected by the projector, and the observation angle and the observation range of a user can be enlarged.
Based on the same inventive concept, the embodiment also provides a projection system, which comprises the projection curtain and the projector. The projection curtain and the projector are arranged in a separated mode, and the projection curtain is used for reflecting light rays emitted by the projector to a preset range.
Referring to the embodiment shown in fig. 7a, the projection screen is represented by light control device 100 and the projector is represented by light source 104; the image projected onto the projection screen by the projector can be reflected to the range of the light spot 1061, and an observer positioned in the range of the light spot 1061 can view the image projected onto the projection screen by the projector. As described above, the projection screen has high brightness and a sufficient and appropriate viewing range; meanwhile, the projection screen can improve the reflected brightness more efficiently, so that the projector with low brightness and low power consumption can ensure that the imaging brightness on the projection screen is consistent with that of the traditional screen, the brightness and the power consumption of the projector are lower, the requirement on a cooling system of the projector can be reduced, even the projector does not need the cooling system, and the cost and the volume of the projector are further reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (17)

1. A light management device, comprising: a main optical axis control element and a dispersion element;
the main optical axis control element is used for reflecting multiple paths of light rays emitted by the light source to the same position;
the dispersion element is arranged on one side, close to the light source, of the main optical axis control element and is arranged between the main optical axis control element and the light source, and the dispersion element is used for diffusing reflected light of the main optical axis control element and forming light spots.
2. A light management device according to claim 1, wherein the primary optical axis control element comprises a plurality of reflective structures for reflecting one or more incident light beams from the light source to the location.
3. A light control device as claimed in claim 2, wherein the reflecting structure is a discrete structure, and the reflecting structure is configured to reflect a light beam emitted from the light source to the predetermined position;
the point (x, y, z) on the reflective structure satisfies the following equation:
Figure FDA0002063905770000011
wherein, P1Is the coordinate of the position of the light source, P2As coordinates of said position, M0(x0,y0,z0) Being the coordinates of a known point on the reflecting structure,
Figure FDA0002063905770000012
a normal vector representing the reflecting structure.
4. A light ray control device according to claim 3, wherein the points (x, y, z) on the reflective structure satisfy the following ranges:
Figure FDA0002063905770000013
wherein x1,x2,y1,y2,z1,z2Is a value determined according to the position of each reflecting structure, and x corresponding to different reflecting structures1,x2,y1,y2,z1,z2The values of (A) are not all the same; alternatively, the first and second electrodes may be,
the point (x, y, z) on the reflecting structure satisfies the following value range:
Figure FDA0002063905770000021
wherein Δ x1,Δx2,Δy1,Δy2,Δz1,Δz2Is a value determined based on the size of the reflecting structure.
5. A light control device as claimed in claim 2, wherein the reflecting structure is a continuous structure, and the reflecting structure is configured to reflect multiple paths of light emitted from the light source to the predetermined position;
the included angle between the reflecting structure and the plane of the main optical axis control element is theta:
Figure FDA0002063905770000022
wherein the content of the first and second substances,
Figure FDA0002063905770000023
a normal vector representing a plane in which the main optical axis control element is located; p1Is the coordinate of the position of the light source, P2As coordinates of said position, M0(x0,y0,z0) Is the coordinate of a known point on the intersection of the reflecting structure and the plane of the main optical axis control element,
Figure FDA0002063905770000024
indicating the reflecting structure at point M0A normal vector of (d);
the point M (x, y, z) on the intersection line of the reflecting structure and the plane of the main optical axis control element satisfies the following equation:
Figure FDA0002063905770000025
wherein the content of the first and second substances,
Figure FDA0002063905770000026
representing the normal vector of the reflecting structure at point M.
6. The light control device of claim 5,
the point M (x, y, z) on the reflecting structure satisfies the following value range:
Figure FDA0002063905770000031
wherein x isv,xu,yv,yu,zv,zuRespectively, boundary values for the dimensions of the main optical axis control element.
7. The apparatus according to claim 2, wherein the reflective structure comprises N reflective surfaces, and different reflective surfaces are used for reflecting one or more incident light beams emitted from different N light sources to the same position; or
Different reflecting surfaces are used for reflecting one path or multiple paths of incident light rays emitted by different N light sources to N different positions.
8. A light management device according to claim 7, wherein N-2;
one reflecting surface of the reflecting structure is used for reflecting the first light to a first preset position, and the other reflecting surface of the reflecting structure is used for reflecting the second light to a second preset position;
the first light is light emitted by one light source, and the second light is light emitted by the other light source.
9. A light management device according to claim 1, wherein the diffusing element is a diffractive optical element.
10. A light management device according to any one of claims 1 to 9, further comprising a substrate;
the base material is located on one side, away from the dispersion element, of the main optical axis control element, and the main optical axis control element is arranged on the base material.
11. A light management device according to any one of claims 1 to 9, further comprising a protection unit;
the protection unit is located on one side, far away from the main optical axis control element, of the dispersion element, and the protection unit covers the dispersion element.
12. A passive light-emitting image source comprising a light source and a light management device according to any of claims 1 to 11;
the light control device is separated from the light source and used for reflecting the light emitted by the light source to a preset range.
13. The passive luminescent image source of claim 12, comprising N light sources;
the main optical axis control element of the light ray control device comprises a plurality of reflection structures, and each reflection structure comprises N reflection surfaces; different reflecting surfaces are used for reflecting one path or multiple paths of incident light rays emitted by different N light sources to N different positions.
14. The passive light-emitting image source of claim 13, wherein N-2, and one light source is configured to emit a first light and the other light source is configured to emit a second light;
one reflecting surface of the reflecting structure is used for reflecting the first light to a first preset position, and the other reflecting surface of the reflecting structure is used for reflecting the second light to a second preset position.
15. The passive luminescent image source of claim 12, further comprising a reflective device;
the reflecting device is used for reflecting the dispersed light spots of the light ray control device, so that the light spots form virtual images outside the reflecting device.
16. A projection curtain comprising the light management device of any of claims 1-11.
17. A projection system comprising a projector and the projection curtain of claim 16;
the projection curtain with the projecting apparatus separation sets up, the projection curtain is used for with light reflection to predetermineeing the within range that the projecting apparatus sent.
CN201910414504.0A 2019-05-17 2019-05-17 Light control device, passive light-emitting image source, projection curtain and system Pending CN111948889A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI768672B (en) * 2021-01-22 2022-06-21 偉詮電子股份有限公司 Projector focusing method and projector focusing system
TWI807915B (en) * 2022-07-11 2023-07-01 鴻海精密工業股份有限公司 Object location method based on diffractive optical element, electronic device, and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI768672B (en) * 2021-01-22 2022-06-21 偉詮電子股份有限公司 Projector focusing method and projector focusing system
US11558591B2 (en) 2021-01-22 2023-01-17 Weltrend Semiconductor Inc. Projector focusing method and projector focusing system capable of projecting high resolution images at arbitrary positions
TWI807915B (en) * 2022-07-11 2023-07-01 鴻海精密工業股份有限公司 Object location method based on diffractive optical element, electronic device, and storage medium

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