CN112255874A - Catadioptric lateral projection screen and projection system - Google Patents
Catadioptric lateral projection screen and projection system Download PDFInfo
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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
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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
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Abstract
The invention discloses a catadioptric lateral projection screen and a projection system, comprising a surface functional layer, an imaging functional layer and a reflection functional layer, wherein the size of the surface functional layer is the same as that of a projection surface of a projection screen; the surface functional layer comprises a linear refraction microstructure layer, and the linear refraction microstructure layer is obtained by cutting a part of rectangular area from a complete linear refraction microstructure array; the surface functional layer, the imaging functional layer and the reflection functional layer are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the symmetry line of the refraction microstructure units in the linear refraction microstructure layer deviates from the perpendicular bisector of the projection screen. The invention aims to provide a catadioptric lateral projection screen and a projection system, which solve the problems of low brightness gain, deviation of brightness uniformity, left-right asymmetry of horizontal visual angle and low image contrast of the conventional projection screen and projection system.
Description
Technical Field
The invention relates to the technical field of optical projection display, in particular to a catadioptric lateral projection screen and a projection system.
Background
Projection display is a display technology in which the outline of image information is enlarged by an optical element and projected onto a screen, and light carrying the image information finally enters human eyes on the screen by means of transmission and reflection to obtain the image information. Projection display technology is widely applied to families, offices, schools and entertainment places at present, and projectors mainly have different types such as CRT, LCD, DLP and the like according to different working modes; the appearance of the intelligent projector enables the traditional huge projector to be exquisite, portable, miniaturized, entertained and practical, and is closer to the development direction of life and entertainment, so that projection products are pushed to home appliances, and the intelligent projector gradually becomes a leading role in viewing images in living rooms or bedrooms.
In existing practical applications, smart projectors are typically used in reflective projection application scenarios; the device is matched with the traditional reflection type screen such as a white wall, a white plastic screen, a glass bead screen, a metal screen and the like to be used in a forward projection mode (a projection device is over against a perpendicular bisector of a projection screen). The conventional reflective front projection screen mainly reflects image light energy incident from a projector to the eyes of a viewer through technical principles such as diffuse reflection and directional reflection, as shown in fig. 1.
The traditional reflective screen based on the technical principle has the defects of low gain and poor ambient light resistance, so that the projection system has the defects of low brightness, poor contrast ratio and the like of displayed images.
In order to seek a large-size viewing experience, consumers are beginning to enter the field of home application with more and more intelligent projection products. The problem that due to normal activities of people, a forward projection display picture is easily interfered by human body shielding, displacement, vibration and the like of a projector or the problem that the large-size projection picture display cannot be met due to small room spacing distance exists in a forward projection application scene (the projection device is placed on a tea table for use) of a living room tea table; in a wall-mounted forward projection application scene (the projection device is mounted on a wall at the top of a consumer for use), a certain oppression is easily caused to the consumer, so that the problem that the user experience is poor or the room is short and large-size projection picture display cannot be met is solved.
In view of the above problems, the prior art also proposes a solution of side projection, in which a projection device is disposed on the left or right side of the perpendicular line P3 in the projection screen, and large-size pictures are displayed by performing trapezoidal correction on the projected images, as shown in fig. 2.
In a side projection scene, as shown in fig. 8, the projection apparatus is used in conjunction with conventional screens such as a white wall, a white plastic screen, a glass bead screen, and a metal screen, and has the disadvantages of low screen brightness gain, deviation in brightness uniformity, left-right asymmetry of horizontal viewing angle, poor ambient light resistance, and the like.
Disclosure of Invention
The invention aims to provide a catadioptric lateral projection screen and a projection system, which solve the problems of low brightness gain, brightness uniformity deviation, left-right asymmetry of horizontal visual angle and low image contrast of the conventional projection screen and projection system.
The invention is realized by the following technical scheme:
a catadioptric lateral projection screen comprises a surface functional layer, an imaging functional layer and a reflection functional layer, wherein the size of the surface functional layer is the same as that of a projection surface of the projection screen;
the surface functional layer comprises a linear refraction microstructure layer, and the linear refraction microstructure layer is obtained by cutting out a part of rectangular area from a complete linear refraction microstructure array; the linear refraction microstructure array comprises a plurality of refraction microstructure units, the refraction microstructure units are vertically arranged and are mutually parallel, and the refraction microstructure units are symmetrical relative to a perpendicular bisector of the linear microstructure array;
the surface functional layer, the imaging functional layer and the reflection functional layer are sequentially arranged from outside to inside along the thickness direction of the projection screen; the axes of the refractive microstructure units in the linear refractive microstructure layer are parallel to a perpendicular bisector P3 of the projection screen, and the symmetry line of the refractive microstructure units in the linear refractive microstructure layer deviates from the perpendicular bisector P3 of the projection screen.
Preferably, the linear refraction microstructure layer comprises a refraction microstructure surface and a substrate plane, the refraction microstructure surface and the substrate plane are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the substrate plane is parallel to the plane of the projection screen;
the refraction microstructure surface comprises a plurality of refraction microstructure units, the refraction microstructure units are vertically arranged on the substrate plane, and the refraction microstructure units are parallel to each other;
any one refraction microstructure unit comprises a refraction surface and a non-refraction surface, the refraction surface and the non-refraction surface are connected with the substrate plane, the cross sections of the refraction surface, the non-refraction surface and the substrate plane are triangles, and the refraction surface is positioned on one side far away from the symmetry line of the refraction microstructure unit.
Preferably, the linear refraction microstructure layer comprises a refraction microstructure surface and a substrate plane, the refraction microstructure surface and the substrate plane are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the substrate plane is parallel to the plane of the projection screen;
the refraction microstructure surface comprises a plurality of refraction microstructure units, the refraction microstructure units are vertically arranged on the substrate plane, and the refraction microstructure units are parallel to each other;
any one refraction microstructure unit comprises a refraction surface, a non-refraction surface and a top surface, wherein the refraction surface and the non-refraction surface are connected with the substrate surface, the top surface is used for connecting the refraction surface and the non-refraction surface, the top surface is parallel to the substrate plane, the cross sections of the refraction surface, the non-refraction surface, the top surface and the substrate plane are trapezoidal, and the refraction surface is positioned on one side far away from the symmetry line of the refraction microstructure unit.
Preferably, the refraction surface and the substrate plane are arranged at an included angle, and the included angle is an acute angle;
the non-refraction surface and the substrate plane are arranged in an included angle which is an acute angle.
Preferably, the reflection function layer comprises a substrate layer and a reflection material layer which are sequentially arranged from outside to inside along the thickness direction of the screen; the surface of one side, facing the viewing area, of the base layer is provided with a smooth plane, and the section of the microstructure of the surface, far away from the viewing area, of the base layer is at least one of a mirror surface, a rough matte surface and the outline shape of the micro-lens array;
the micro-lens array consists of linear prism micro-structures or rotationally symmetrical conic curve micro-structures which extend along the height direction of the projection screen and are arrayed along the width direction of the projection screen; the linear prism microstructures and the rotational symmetry conic curve microstructure array are concave towards one side of a viewing area or convex towards one side of a back plate supporting layer;
the light reflecting material layer is positioned on the surface of the side, away from the viewing area, of the surface microstructure.
Preferably, the reflective functional layer (3) comprises a reflective material layer and a concentric circle microstructure layer;
the concentric circle microstructure layer is obtained by intercepting a partial rectangular area by a complete concentric circle microstructure array, the concentric circle microstructure array comprises a plurality of microstructure units with the same circle center and sequentially increased radius, and the intercepted concentric circle microstructure layer meets the following requirements:
wherein R is1The maximum radius of the microstructure units in the concentric circle microstructure layer from the center of the circle is obtained; r2The minimum radius of the microstructure units in the concentric circle microstructure layer from the circle center is obtained; h is the height of the projection screen; w is the width of the projection screen; d3The distance between the vertical edge of one side of the projection screen close to the circle center and the circle center is determined; d4The distance between the horizontal edge of the projection screen close to one side of the circle center and the circle center is obtained; d is the maximum radius R1And a minimum radius R2Acceptable radius deviation value, and d is more than or equal to 0mm and less than or equal to 500 mm;
the concentric circle microstructure layer and the reflective material layer are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the circle center of the microstructure unit in the concentric circle microstructure layer deviates from the perpendicular bisector P3 of the projection screen.
Preferably, the non-refractive surface and the top surface are further provided with a light absorbing material.
Preferably, the surface functional layer further comprises an anti-dazzle and anti-scratch material layer, and the anti-dazzle and anti-scratch material layer is arranged on the surface of the refraction microstructure; the surface of the anti-dazzle scratch-resistant material layer is a rough surface with concave-convex fluctuation, and the surface hardness of the anti-dazzle scratch-resistant material layer is greater than or equal to 2H.
A catadioptric lateral projection screen lateral projection system comprises a projection device and the catadioptric lateral projection screen, wherein the projection device is arranged in a viewing area and is arranged on the left side or the right side of a plane which passes through a perpendicular bisector P3 of the projection screen and is perpendicular to the plane of the projection screen; the installation position of the projection device is obtained by the following formula:
d3＝d2*tan(θ)-W/2
d4＝C
wherein d is3Represents the horizontal distance between the center Q of the lens of the projection device and the side edge of the projection screen which is closest to the center Q of the lens of the projection device and is parallel to the height direction of the projection screen, d2Representing the vertical distance of the center Q of the lens of the projection device from the plane of the projection screen; w represents the width of the projection screen; θ represents the angle between the optical axis P1 passing through the projection device lens center Q and the perpendicular P3 in the rectangular display area of the projection screen, and the normal P2 of the plane of the projection screen passing through the perpendicular P3 in the rectangular display area of the projection screen in the same horizontal plane in the horizontal plane passing through the projection device lens center Q; d4The vertical distance between the center Q of the lens of the projection device and the side edge of the projection screen, which is closest to the center Q of the lens of the projection device and is parallel to the width direction of the projection screen, is represented; c is a real number indicating that the center Q of the lens of the projection device is closest to the center Q of the lens of the projection device and is equal to the center Q of the lens of the projection deviceAnd the actual vertical distance value of the side edge of the projection screen parallel to the width direction of the projection screen.
Preferably, when the width to height ratio of the projection display is 9: 16. 3: 4 or 10: 16, the projection device and the projection screen rotate 90 degrees clockwise or counterclockwise by taking a normal passing through the center of the projection screen as a rotating shaft;
when the projection device is used for hanging projection, the projection device and the projection screen rotate 180 degrees clockwise or anticlockwise by taking a normal passing through the center of the projection screen as a rotating shaft.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) by adjusting the parameters of the refraction microstructure units, the transmission direction of the laterally incident projection beams can be effectively adjusted, so that the emergent projection beams are concentrated in an effective viewing area as much as possible, and the light energy utilization rate of the projection screen is improved; thereby obtaining a display image with higher brightness gain compared with the conventional projection screen; meanwhile, the image quality problems that the traditional screen display image has brightness uniformity deviation (for example, when a viewer observes at the center of the vertical projection screen, the left side of the plane of the projection screen is brighter and the right side is darker, or the left side is darker and the right side is brighter), the horizontal visual angle is seriously asymmetric (for example, when the vertical projection screen observes, the horizontal visual angle at the left side is 35 degrees and the horizontal visual angle at the right side is only 15 degrees; the normal viewing habit and the standard requirement of the screen are +/-25 degrees, and the deviation is less than 1 degree) and the like are optimized and improved;
(2) by arranging the light absorption material and/or the light diffusion material in the surface functional layer, the environment light can be effectively absorbed and the viewing angle can be effectively controlled, so that a display image with higher contrast and a better viewing angle compared with the traditional projection screen can be obtained;
(3) be provided with anti-dazzle faint scratch resistant layer, prevent that projection screen from by the fish tail in the in-service use to guarantee projection screen's outward appearance integrality, the use, the cleanness and the maintenance in projection screen later stage of being convenient for.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an orthographic projection in the prior art;
FIG. 2 is a schematic side-view projection of the prior art;
FIG. 3 is a schematic structural diagram of a catadioptric lateral projection screen according to the present invention;
FIG. 4 is a schematic diagram of the present invention for obtaining a linear refractive microstructure layer;
FIG. 5 is a schematic structural diagram of a refractive microstructure surface according to the present invention;
FIG. 6 is a schematic structural view of a refractive microstructure layer according to the present invention;
FIG. 7 is a schematic diagram of a catadioptric projection screen according to the present invention;
FIG. 8 is a projection beam transmission diagram of a conventional projection screen;
FIG. 9 is a projection beam transmission diagram of a projection screen according to the present invention;
FIG. 10 is a schematic diagram of a position relationship between a projection apparatus and a projection screen according to the present invention;
reference numbers and corresponding part names in the drawings:
1. a linear refractive microstructure layer; 2. an imaging functional layer; 3. a reflective functional layer; 4. a refractive microstructure unit; 401. a base plane; 402. a refractive surface; 403. a non-refractive surface; 5. and a light-condensing functional layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
A catadioptric lateral projection screen, as shown in FIG. 3, includes a surface functional layer with the same size as the projection surface of the projection screen, an imaging functional layer 2 and a reflection functional layer 3; wherein, the surface functional layer comprises a linear refraction microstructure layer 1; as shown in fig. 4, the linear refractive microstructure layer 1 is obtained by cutting a partial rectangular area from a complete linear refractive microstructure array, the linear refractive microstructure array includes a plurality of refractive microstructure units 4, the refractive microstructure units 4 are vertically arranged and parallel to each other, and the refractive microstructure units 4 are symmetrical with respect to a perpendicular bisector of the linear microstructure array. In this embodiment, the intercepted linear refractive microstructure layer 1 includes a refractive microstructure surface and a substrate plane 401, the refractive microstructure surface and the substrate plane 401 are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the substrate plane 401 is parallel to the plane of the projection screen. As shown in fig. 5, the refractive microstructure surface includes a plurality of refractive microstructure units 4, and the refractive microstructure units 4 are vertically disposed on a substrate plane 401, and the refractive microstructure units 4 are parallel to each other. As shown in fig. 6, any one of the refractive microstructure units 4 includes a refractive surface 402 and a non-refractive surface 403, both the refractive surface 402 and the non-refractive surface 403 are connected to the substrate plane 401, the cross-sections of the refractive surface 402, the non-refractive surface 403 and the substrate plane 401 are triangular, and the refractive surface 402 is located on the side away from the symmetry line of the refractive microstructure unit 4. In addition, as shown in fig. 7, in order to better match the projection light beams, so that the projection light beams of various angles incident on the projection screen can be transmitted by the linear refraction microstructure layer 1, and the emergent projection light beams are transmitted to the effective viewing area near the central normal of the projection screen, the included angles between the refraction surface 402 and the substrate plane 401 and the included angles between the non-refraction surface 403 and the substrate plane 401 are both set to be acute angles, and the specific setting angles may be set according to actual situations.
The conventional catadioptric projection screen only performs mirror reflection and/or diffuse reflection on incident light, as shown in fig. 8, a large proportion of projection light beams on the left side of the projection screen returns to a viewing area, and a large proportion of projection light beams on the right side of the projection screen returns to a non-viewing area, so that the brightness uniformity of the projection screen is deviated, and when the projection screen is observed vertically, the left side of the plane of the projection screen is brighter and the right side is darker (or the left side is darker and the right side is brighter, and the projection device is arranged on the other side of a perpendicular bisector P3 of the projection screen), so that the brightness of the whole projection screen is not uniform; in addition to this, a severe asymmetry of the horizontal viewing angle can also result, for example: when the vertical projection screen is observed, the horizontal visual angle at the left side is 35 degrees, the horizontal visual angle at the right side is only 15 degrees, the normal viewing habit and the standard requirement of the projection screen are +/-25 degrees, and the deviation is less than 1 degree, so that the viewing feeling of audiences is influenced. In the application, the linear refraction microstructure layer 11 is added, and the direction and the emergent direction of the projection light beam in the projection screen can be controlled by adjusting the included angles between the refraction surface 402 and the substrate plane 401 and between the non-refraction surface 403 and the substrate plane 401, so that the projection light beam is prevented from being reflected to a region outside an effective viewing region near the central normal of the projection screen, and the light energy utilization efficiency and the brightness gain of the projection screen are improved; the defects of the traditional projection screen are effectively overcome, specifically, when the projection screen is used, the projection light beam of the projection screen moves to the direction shown in fig. 9, after the projection light is adjusted by the refraction microstructure unit 4, the projection light beams on the left side and the right side of the projection screen are all reflected to the effective viewing area near the central normal of the projection screen, so that the brightness of the whole projection screen is very uniform, and meanwhile, the problem of asymmetric horizontal visual angle is effectively solved.
In addition, considering that the cross section of the refractive microstructure unit 4 is triangular, the top of the refractive microstructure unit 4 is the vertex angle of the triangle, when bonding with other film layers, due to the small contact area, not only other film layers are easily damaged, but also the bonding instability is easily occurred, therefore, the connection part of the refractive surface 402 and the non-refractive surface 403 can be cut off, so that the cross section of the refractive microstructure unit 4 is trapezoidal, the refractive microstructure unit 4 at this time includes the refractive surface 402, the non-refractive surface 403 and the top surface, the refractive surface 402 and the non-refractive surface 403 are connected with the substrate surface, the top surface is used for connecting the refractive surface 402 and the non-refractive surface 403, and the top surface is parallel to the substrate plane 401, the cross sections of the refractive surface 402, the non-refractive surface 403 and the substrate plane 401 are trapezoidal, because the top of the refractive microstructure unit 4 at this time is a plane, during bonding, the contact area can be effectively increased, so that the bonding between the film layers is firmer, and the risk that the vertex angle of the triangle is scratched by external force can be reduced.
In the specific implementation of the embodiment, the surface functional layer, the imaging functional layer 2 and the reflection functional layer 3 are sequentially arranged from outside to inside along the thickness direction of the projection screen, wherein the axis of the refractive microstructure unit 4 in the linear refractive microstructure layer 1 is parallel to the perpendicular bisector P3 of the projection screen, and the symmetry line of the refractive microstructure unit 4 in the linear refractive microstructure layer 1 deviates from the perpendicular bisector P3 of the projection screen. The deviation of the symmetry line of the refractive microstructure unit 4 from the perpendicular bisector P3 of the projection screen in this embodiment means that: according to the intercepted linear refractive microstructure layer 1, the symmetry line of the refractive microstructure unit 4 may be located outside the projection screen, or may be located on the projection screen, and the symmetry line of the refractive microstructure unit 4 located on the projection screen or outside the projection screen may be located at any position except the perpendicular bisector P3 of the projection screen.
Further, in the present embodiment, the reflective function layer 3 includes a base layer and a light reflecting material layer; the surface of one side, facing the viewing area, of the base layer is a smooth plane, and the section of the microstructure of the surface, facing away from the viewing area, of the base layer is at least one of a mirror surface, a rough matte surface and the outline shape of the micro-lens array;
the micro-lens array consists of linear prism micro-structures or rotationally symmetrical conic curve micro-structures which extend along the height direction of the projection screen and are arrayed along the width direction of the projection screen; the linear prism microstructure and the rotational symmetry conic curve microstructure array are concave towards one side of the viewing area or convex towards one side of the back plate supporting layer;
the reflecting material layer is positioned on one side of the substrate layer far away from the viewing area, comprises at least one of aluminum, silver and reflecting medium film materials with high visible light reflectivity, and is attached to the substrate layer through any one of printing, spraying, transfer printing and vacuum coating.
Further, in order to improve the contrast and the appearance color effect of the projection screen, in this embodiment, the non-refractive surface 403 and the top surface are further provided with a light absorbing material capable of absorbing ambient light, and the light absorbing material includes at least one of black and dark gray pigment, ink, paint or anti-reflective dielectric film material, and is attached to the non-refractive surface 403 and the top surface by any one of printing, spraying, transferring and vacuum coating. When ambient light enters the inside of the projection screen, the ambient light is absorbed by the light absorption material, and the ambient light is effectively reduced from entering the effective viewing area, so that the ambient light resistance of the projection screen is improved, the projection screen is used in a bright environment, and the display picture has a more ideal effect.
In practical implementation, instead of disposing light absorbing materials on the non-refractive surface 403 and the top surface, a filter layer and a light scattering layer may be disposed on the side of the surface functional layer facing the viewing area, but considering that light refraction requires a certain difference between refractive indexes of two layers of materials, which may result in higher material cost and a larger included angle between the refractive surface 402 of the refractive microstructure unit 4 and the substrate plane 401. Therefore, in the present embodiment, by disposing light absorbing materials on the non-refractive surface 403 and the top surface instead of the filter layer and the light diffusion layer disposed on the side of the surface functional layer facing the viewing area, so that the refractive microstructure unit 4 is in direct contact with air, the above-mentioned problems are preferably reduced.
Further, in this embodiment, the surface functional layer further includes an anti-glare and scratch-resistant material layer, and the anti-glare and scratch-resistant material layer is disposed on the surface of the refractive microstructure; the surface of the anti-dazzle and scratch-resistant material layer in the embodiment is a rough surface with concave and convex fluctuation, and the surface hardness of the anti-dazzle and scratch-resistant material layer is greater than or equal to 2H.
The anti-dazzle and scratch-resistant layer can be a scratch-resistant protective film or a light-transmitting resin layer with higher hardness in a curing state, so that the projection screen is prevented from being scratched in the actual use process, the appearance integrity of the projection screen is ensured, and the projection screen is convenient to use, clean and maintain in the later period; in addition, because the anti-dazzle and scratch-resistant layer has the rough surface with the concave-convex profile, the effects of resisting glare and inhibiting speckles on the surface of the projection screen can be achieved.
Further, in this embodiment, in order to protect the reflective material layer of the projection screen during use, a back plate supporting layer is further provided, where the back plate supporting layer includes, but is not limited to, a honeycomb aluminum plate, an iron plate, a glass fiber plate, and other rigid materials, and when specifically configured, the back plate supporting layer is adhered to the reflective functional layer 3.
Example 2
The present embodiment is different from embodiment 1 in that the reflective functional layer 3 in the present embodiment includes a reflective material layer and a concentric circle microstructure layer;
in the embodiment, the concentric microstructure layer is obtained by cutting a part of rectangular area from a complete concentric microstructure array. Wherein, the concentric circle microstructure array includes that a plurality of centre of a circle is the same and the radius increases in proper order the microstructure unit, and the concentric circle micro-structure layer of intercepting satisfies:
wherein R is1The maximum radius of the microstructure units in the concentric circle microstructure layer from the center of a circle; r2The minimum radius of the microstructure units in the concentric circle microstructure layer from the center of a circle; h is the height of the projection screen; w is the width of the projection screen; d3The distance between the vertical edge of one side of the projection screen close to the circle center and the circle center is shown; d4The distance between the horizontal edge of one side of the projection screen close to the circle center and the circle center is shown; d is the maximum radius R1And a minimum radius R2Acceptable radius deviation value, and d is more than or equal to 0mm and less than or equal to 500 mm;
in this embodiment, the intercepted concentric circular microstructure layer includes a microstructure surface and a substrate plane, the substrate plane and the microstructure surface are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the substrate plane is parallel to the plane of the projection screen. The microstructure surface comprises a plurality of microstructure units which are arranged on the plane of the substrate in a concentric circle manner, wherein each microstructure unit comprises a light reflecting surface and a non-light reflecting surface, the light reflecting surface and the non-light reflecting surface are both connected with the plane of the substrate, the cross sections of the light reflecting surface, the light reflecting surface and the plane of the substrate are triangles, and the light reflecting surface is positioned on one side far away from the circle center.
In specific implementation, the surface functional layer, the imaging functional layer 2, the reflective material layer and the concentric micro-structural layer are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the circle center of the micro-structural unit in the concentric micro-structural layer deviates from the perpendicular bisector P3 of the projection screen. The deviation of the center of the microstructure unit from the perpendicular bisector P3 of the projection screen in this embodiment refers to: according to the intercepted concentric microstructure layer, the circle center of the microstructure unit can be positioned outside the projection screen or on the projection screen, and the circle center of the microstructure unit positioned on the projection screen or outside the projection screen can be positioned at any position outside the perpendicular bisector P3 of the projection screen. In addition, the reflective material layer in the present embodiment includes at least one of aluminum, silver, and reflective dielectric film materials with high visible light reflectivity, and is attached to the imaging functional layer 2 by any one of printing, spraying, transferring, and vacuum coating.
A side projection system of a catadioptric side projection screen comprises a projection device and the catadioptric side projection screen, wherein the projection device is arranged in a viewing area and is arranged on the left side or the right side of a plane which passes through a perpendicular bisector P3 of the projection screen and is perpendicular to the plane of the projection screen; for optimal display of the projected image, the projection of the installation position of the projection device should coincide with the perpendicular bisector of the refractive microstructure unit 4, i.e.: the perpendicular to the plane of the projection screen passes through the center Q of the lens of the projection apparatus and the perpendicular bisector of the refractive microstructure unit 4, and in the embodiment, as shown in fig. 10, the installation position of the projection apparatus is obtained by the following formula:
d3＝d2*tan(θ)-W/2
d4＝C
wherein d is3Indicating the center Q of the lens of the projection device and the center Q of the lens of the projection deviceA horizontal distance, d, of the side of the projection screen which is close to and parallel to the height direction of the projection screen2Representing the vertical distance of the center Q of the lens of the projection device from the plane of the projection screen; w represents the width of the projection screen; θ represents the angle between the optical axis P1 passing through the projection device lens center Q and the perpendicular P3 in the rectangular display area of the projection screen, and the normal P2 of the screen plane passing through the perpendicular P3 in the rectangular display area of the projection screen in the same horizontal plane in the horizontal plane passing through the projection device lens center Q; d4The vertical distance between the center Q of the lens of the projection device and the side edge of the projection screen, which is closest to the center Q of the lens of the projection device and is parallel to the width direction of the projection screen, is represented; c is a real number representing the actual vertical distance value of the side of the projection screen which is closest to the center Q of the lens of the projection device and is parallel to the width direction of the projection screen.
When the projection beam emitted by the projection device enters the linear refraction microstructure layer 1 in the projection screen, the transmission directions of the projection beams with various angles incident on the projection screen can be adjusted by the refraction microstructure units 4. The trend of the projection light beam is controlled by adjusting the included angles between the refraction surface 402 and the substrate plane 401 and between the non-refraction surface 403 and the substrate plane 401, so that the projection light beam can be prevented from being reflected to the outside of the viewing area, the reflected light rays can enter the effective viewing area near the central normal of the projection screen as much as possible, the brightness and the light energy utilization rate of the projection screen can be improved, the ambient light rays can be prevented from entering the viewing area, the brightness uniformity of each part of the projection screen can be adjusted, and the brightness uniformity deviation can be improved (for example, when the projection screen is observed perpendicularly to the screen plane, the left side of the screen plane is brighter, the right side of the screen plane is darker, or the left side of the screen plane is darker, the right side of the screen plane is brighter), and the horizontal viewing angle is seriously asymmetric (for example, when the left side of the horizontal viewing angle is 35 degrees, and the right side of the horizontal viewing angle is, image quality problems such as a deviation of less than 1 °).
It is worth mentioning that the value range is usually 10-50 degrees and the value is 20-40 degrees as the best according to the design specifications of home and office buildings and the application scene of reflective side projection under most conditions.
When the width and height ratio of the projection display picture is 9: 16. 3: 4 or 10: 16, the projection device and the projection screen rotate 90 degrees clockwise or anticlockwise by taking a normal passing through the center of the projection screen as a rotating shaft; when the projection device is used for hanging projection, the projection device and the projection screen rotate 180 degrees clockwise or anticlockwise by taking a normal passing through the center of the projection screen as a rotating shaft.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A catadioptric lateral projection screen, characterized by comprising a surface functional layer, an imaging functional layer (2) and a reflection functional layer (3) having the same size as the projection surface of the projection screen;
the surface functional layer comprises a linear refraction microstructure layer (1), and the linear refraction microstructure layer (1) is obtained by cutting out a part of rectangular area from a complete linear refraction microstructure array; the linear refraction microstructure array comprises a plurality of refraction microstructure units (4), the refraction microstructure units (4) are vertically arranged and are mutually parallel, and the refraction microstructure units (4) are symmetrical relative to a perpendicular bisector of the linear refraction microstructure array;
the surface functional layer, the imaging functional layer (2) and the reflection functional layer (3) are sequentially arranged from outside to inside along the thickness direction of the projection screen; the axes of the refractive microstructure units (4) in the linear refractive microstructure layer (1) are parallel to a perpendicular bisector P3 of the projection screen, and the symmetry line of the refractive microstructure units (4) in the linear refractive microstructure layer (1) deviates from the perpendicular bisector P3 of the projection screen.
2. A catadioptric lateral projection screen according to claim 1, wherein the linear refractive microstructure layer (1) comprises a refractive microstructure surface and a base plane (401), the refractive microstructure surface and the base plane (401) are arranged in sequence from outside to inside along the thickness direction of the projection screen, and the base plane (401) is parallel to the plane of the projection screen;
the refraction microstructure surface comprises a plurality of refraction microstructure units (4), the refraction microstructure units (4) are vertically arranged on the substrate plane (401), and the refraction microstructure units (4) are parallel to each other;
any one of the refractive microstructure units (4) comprises a refractive surface (402) and a non-refractive surface (403), the refractive surface (402) and the non-refractive surface (403) are both connected with the substrate plane (401), the cross sections of the refractive surface (402), the non-refractive surface (403) and the substrate plane (401) are triangular, and the refractive surface (402) is positioned on one side of a symmetry line far away from the refractive microstructure unit (4).
3. A catadioptric lateral projection screen according to claim 1, wherein the linear refractive microstructure layer (1) comprises a refractive microstructure surface and a base plane (401), the refractive microstructure surface and the base plane (401) are arranged in sequence from outside to inside along the thickness direction of the projection screen, and the base plane (401) is parallel to the plane of the projection screen;
the refraction microstructure surface comprises a plurality of refraction microstructure units (4), the refraction microstructure units (4) are vertically arranged on the substrate plane (401), and the refraction microstructure units (4) are parallel to each other;
any one of the refractive microstructure units (4) comprises a refractive surface (402), a non-refractive surface (403) and a top surface, wherein the refractive surface (402) and the non-refractive surface (403) are connected with the substrate surface, the top surface is used for connecting the refractive surface (402) and the non-refractive surface (403), the top surface is parallel to the substrate plane (401), the cross sections of the refractive surface (402), the non-refractive surface (403), the top surface and the substrate plane (401) are trapezoidal, and the refractive surface (402) is positioned on one side far away from the symmetry line of the refractive microstructure unit (4).
4. A catadioptric lateral projection screen according to claim 2 or 3, wherein the refractive surface (402) is at an acute angle to the base plane (401);
the non-refraction surface (403) and the substrate plane (401) are arranged in an included angle which is an acute angle.
5. A catadioptric lateral projection screen according to claim 4, wherein the reflective functional layer (3) comprises a substrate layer and a reflective material layer arranged in sequence from outside to inside along the thickness direction of the projection screen;
the surface of one side, facing the viewing area, of the base layer is a smooth plane, and when the projection screen is observed along the height direction of the projection screen, the section of the microstructure on the surface of the base layer, far away from the viewing area, is at least one of a mirror surface, a rough matte surface and the outline shape of the micro-lens array;
the micro-lens array consists of linear prism micro-structures or rotationally symmetrical conic curve micro-structures which extend along the height direction of the projection screen and are arrayed along the width direction of the projection screen; the linear prism microstructures and the rotational symmetry conic curve microstructure array are concave towards one side of a viewing area or convex towards one side of a back plate supporting layer.
6. A catadioptric lateral projection screen according to claim 4, wherein the reflective functional layer (3) comprises a layer of light reflecting material and a concentric micro-structured layer;
the concentric circle microstructure layer is obtained by intercepting a partial rectangular area by a complete concentric circle microstructure array, the concentric circle microstructure array comprises a plurality of microstructure units with the same circle center and sequentially increased radius, and the intercepted concentric circle microstructure layer meets the following requirements:
wherein R is1The maximum radius of the microstructure units in the concentric circle microstructure layer from the center of the circle is obtained; r2The minimum radius of the microstructure units in the concentric circle microstructure layer from the circle center is obtained; h is the height of the projection screen; w is the width of the projection screen; d3The distance between the vertical edge of one side of the projection screen close to the circle center and the circle center is determined; d4The distance between the horizontal edge of the projection screen close to one side of the circle center and the circle center is obtained; d is the maximum radius R1And a minimum radius R2Acceptable radius deviation value, and d is more than or equal to 0mm and less than or equal to 500 mm;
the concentric circle microstructure layer and the reflective material layer are sequentially arranged from outside to inside along the thickness direction of the projection screen, and the circle center of the microstructure unit in the concentric circle microstructure layer deviates from the perpendicular bisector P3 of the projection screen.
7. A catadioptric lateral projection screen according to claim 3, wherein the non-refractive surface (403) and the top surface are further provided with a light absorbing material.
8. A catadioptric lateral projection screen according to claim 5 or 6, wherein the surface functional layer further comprises a layer of anti-glare and scratch-resistant material disposed on the refractive microstructure surface; the surface of the anti-dazzle scratch-resistant material layer is a rough surface with concave-convex fluctuation, and the surface hardness of the anti-dazzle scratch-resistant material layer is greater than or equal to 2H.
9. A catadioptric lateral projection system comprising a projection device and further comprising a catadioptric lateral projection screen according to any of claims 1-8, the projection device being located in a viewing area and the projection device being located to the left or right of a plane perpendicular to the plane of the projection screen and passing through a perpendicular bisector P3 of the projection screen; the installation position of the projection device is obtained by the following formula:
d3＝d2*tan(θ)-W/2
d4＝C
wherein d is3Represents the horizontal distance between the center Q of the lens of the projection device and the side edge of the projection screen which is closest to the center Q of the lens of the projection device and is parallel to the height direction of the projection screen, d2Representing the vertical distance of the center Q of the lens of the projection device from the plane of the projection screen; w represents the width of the projection screen; θ represents the angle between the optical axis P1 passing through the projection device lens center Q and the perpendicular P3 in the rectangular display area of the projection screen, and the normal P2 of the plane of the projection screen passing through the perpendicular P3 in the rectangular display area of the projection screen in the same horizontal plane in the horizontal plane passing through the projection device lens center Q; d4The vertical distance between the center Q of the lens of the projection device and the side edge of the projection screen, which is closest to the center Q of the lens of the projection device and is parallel to the width direction of the projection screen, is represented; c is a real number representing an actual vertical distance value of the projection screen side, which is closest to the projection device lens center Q and parallel to the projection screen width direction.
10. A catadioptric lateral projection system according to claim 9, wherein when the ratio of the width to the height of the projected display is 9: 16. 3: 4 or 10: 16, the projection device and the projection screen rotate 90 degrees clockwise or counterclockwise by taking a normal passing through the center of the projection screen as a rotating shaft;
when the projection device is used for hanging projection, the projection device and the projection screen rotate 180 degrees clockwise or anticlockwise by taking a normal passing through the center of the projection screen as a rotating shaft.
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Application publication date: 20210122 |