CN114355623A - One-dimensional retro-reflection sheet for projection light field stereoscopic display - Google Patents
One-dimensional retro-reflection sheet for projection light field stereoscopic display Download PDFInfo
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Abstract
In the projection light field stereo display, when the distance from the one-dimensional retroreflection sheet to the projector is changed, the one-dimensional retroreflection effect is deteriorated. In order to solve the problem, the invention provides a one-dimensional retroreflection sheet for projection light field stereoscopic display. The one-dimensional retro-reflection sheet for the projection light field three-dimensional display is composed of a first cylindrical lens grating, a slit grating, a second cylindrical lens grating and a diffuse reflection layer. The first lenticular pattern forms a first retroreflective structure. The second lenticular sheet and the diffusive reflective layer form a second retroreflective structure. The one-dimensional retro-reflection sheet can optimize the one-dimensional retro-reflection effect by utilizing the constraint action of the slit grating on the light beams and matching with the composite retro-reflection structure, so that the one-dimensional retro-reflection sheet still has a better retro-reflection effect under the condition that the distance of the projector is close.
Description
Technical Field
The invention belongs to the technical field of projection light field stereoscopic display, and particularly relates to a one-dimensional retro-reflection sheet for projection light field stereoscopic display.
Background
Generally, the projected light field stereoscopic display is formed by coupling a projector array and a one-dimensional retro-reflective curtain which are arranged in parallel. The one-dimensional retro-reflective curtain can reflect light back to the position of the projector in the horizontal direction, so that a stereoscopic display light field is constructed. Non-coaxial projection stereoscopic display (CN 202111519354.3) with one-dimensional retroreflective sheet whose normal direction is consistent and not parallel to the normal of image plane further enhances the practicability of projection light field stereoscopic display. However, in non-coaxial projection stereoscopic displays, the distance from each retroreflective sheet to the projector is not equal. The conventional one-dimensional retroreflective sheeting is usually composed of a cylindrical lenticular grating and a diffuse reflection layer, and is characterized in that under the condition that a projector is away from the cylindrical lenticular grating at different object distances, the width of stripes formed on the diffuse reflection layer by light rays is different, and the width of the stripes is wider as the distance between the projector and the cylindrical lenticular grating is closer. While wider stripes will deteriorate the one-dimensional retroreflective effect. This therefore makes conventional one-dimensional retroreflective sheeting composed of a lenticular sheet and a diffuse reflective layer impractical. In order to solve the problem that the distance from the traditional one-dimensional retro-reflection sheet to a projector is changed and the one-dimensional retro-reflection effect of the traditional one-dimensional retro-reflection sheet is deteriorated, the invention provides the one-dimensional retro-reflection sheet for the projection light field stereoscopic display. The one-dimensional retro-reflection sheet further optimizes the one-dimensional retro-reflection effect by utilizing the constraint action of the diaphragm on the light beams and matching with the composite retro-reflection structure, so that the one-dimensional retro-reflection sheet still has a better retro-reflection effect under the condition that the distance of the projector is closer.
Disclosure of Invention
In order to solve the problem that the one-dimensional retro-reflection effect of the traditional one-dimensional retro-reflection sheet is deteriorated along with the change of the distance of a projector, the invention provides the one-dimensional retro-reflection sheet for the projection light field stereoscopic display.
The one-dimensional retro-reflection sheet for the projection light field three-dimensional display is composed of a first cylindrical lens grating, a slit grating, a second cylindrical lens grating and a diffuse reflection layer.
The first cylindrical lenticulation, the second cylindrical lenticulation and the diffuse reflection layer are sequentially arranged in front and at the back. The slit grating is placed in front of the diffuse reflecting layer. The arrangement direction of each cylindrical lens in the first cylindrical lens grating is parallel to the arrangement direction of each slit in the slit grating and is parallel to the arrangement direction of each cylindrical lens in the second cylindrical lens grating.
The distance from each cylindrical lens vertex in the first cylindrical lens grating to each cylindrical lens vertex in the second cylindrical lens grating is larger than the focal length of the first cylindrical lens grating, and the distance from each cylindrical lens vertex in the second cylindrical lens grating to the diffuse reflection layer is larger than or equal to the focal length of the second cylindrical lens grating.
The width of each slit on the slit grating is smaller than the pitch of the first cylindrical lens grating or the pitch of the second cylindrical lens grating.
Preferably, the slit grating is placed between the first cylindrical lens grating and the second cylindrical lens grating, the distance from the vertex of each cylindrical lens in the first cylindrical lens grating to the slit grating is equal to the focal length of the first cylindrical lens grating, and the width of each slit on the slit grating is smaller than the pitch of the second cylindrical lens grating.
Optionally, if a distance from each vertex of the cylindrical lens in the first cylindrical lens grating to each vertex of the cylindrical lens in the second cylindrical lens grating is less than or equal to a focal length of the first cylindrical lens grating, a distance from each vertex of the cylindrical lens in the second cylindrical lens grating to the diffuse reflection layer is less than a focal length of the second cylindrical lens grating.
The principle of improving the one-dimensional retroreflection performance of the invention is as follows:
1. the first lenticular pattern forms a first retroreflective structure.
The slit grating is arranged between the first cylindrical lens grating and the second cylindrical lens grating, and when the distance from the vertex of each cylindrical lens in the first cylindrical lens grating to the slit grating is equal to the focal length of the first cylindrical lens grating, light rays emitted by the projector irradiate the slit grating after passing through the first cylindrical lens grating. Because the invention is applied to the projection light field stereoscopic display, the distance from the projector to the first cylindrical lens grating is far greater than the focal length of the first cylindrical lens grating, and therefore, the light rays emitted by the projector are converged at the plane position of the slit grating after passing through each cylindrical lens in the first cylindrical lens grating to form stripes. According to the principle that the light path is reversible, if the fringe is diffusely reflected and the width of the fringe approaches to 0, the diffusely reflected light can be projected to the position of the projector through the first cylindrical lens grating.
However, in the case where the projector is at a different object distance from the first cylindrical lenticulation, the width of the fringes formed by the light beams is different and is not 0. Wider stripes will cause the retroreflected light to be more divergent. To solve this problem, the present invention provides a second retroreflective structure that provides directionality to the reflected light in the first retroreflective structure, which is equivalent to reducing the stripe width, thereby improving the effect of the first retroreflective structure.
2. The second lenticular sheet and the diffusive reflective layer form a second retroreflective structure.
Light emitted by the projector irradiates the slit grating after passing through the first cylindrical lens grating, and then enters the second cylindrical lens grating and the diffuse reflection layer through the slit on the slit grating. The second lenticular sheet and the diffusive reflective layer form a second retroreflective structure that conforms to the principles of the first retroreflective structure. After being reflected by the second retro-reflective structure, the light beam is reflected according to the original incident direction, so that the diffuse reflection light in the first retro-reflective structure has directivity.
Further, there is some divergence of the retroreflected light, again due to the width of the striations formed by the light on the diffuse reflective layer of the second retroreflected structure. To solve this problem, the slit grating of the present invention forms a diaphragm to confine the diverging beam, thereby improving the effect of the first and second retro-reflective structures.
3. The slit grating constitutes a diaphragm.
In the invention, the width of each slit on the slit grating is smaller than the pitch of the second cylindrical lens grating, so that the slit grating forms an aperture diaphragm. After light rays emitted by the projector pass through the first cylindrical lens grating and irradiate the slit grating, when the light rays are incident to the second cylindrical lens grating and the diffuse reflection layer through the slit on the slit grating, the aperture diaphragm limits the light beams and finally reduces the width of the stripes on the diffuse reflection layer. When the reflected light passes through the slit grating again, the aperture diaphragm limits the light beam again, the light scattering angle range is reduced, and the retro-reflection effect is optimized finally.
In summary, the reflective light in the first retro-reflective structure is made to have directivity by the second retro-reflective structure, which is equivalent to reducing the stripe size, and the aperture stop formed by the slit grating is used to perform stripe size restriction again and reduce the light scattering angle range, so that the retro-reflective effect can be effectively optimized.
It should be noted that, since the slit grating only functions as an aperture stop, the above principle still holds if the slit grating is not disposed between the first lenticular lens grating and the second lenticular lens grating. The slit grating is placed between the first cylindrical lens grating and the second cylindrical lens grating, and specifically, the slit grating can be placed at any position in front of the diffuse reflection layer.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the operation of the present invention.
Fig. 3 is a schematic diagram comparing a conventional one-dimensional retroreflective structure.
Icon: 100-a first cylindrical lenticulation; 200-slit grating; 300-second cylindrical lens grating; 400-a diffuse reflective layer; 500-point light source; 201-stripes at the slit grating; 202-equivalent stripes.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed Description
Fig. 1 is a one-dimensional retroreflective sheet for stereoscopic display of projected light field according to the present embodiment.
The one-dimensional retro-reflection sheet for the projection light field stereo display is composed of a first cylindrical lens grating 100, a slit grating 200, a second cylindrical lens grating 300 and a diffuse reflection layer 400.
The first lenticular lens 100, the slit grating 200, the second lenticular lens 300, and the diffusive reflective layer 400 are sequentially disposed in front of and behind one another. The arrangement direction of each cylindrical lens in the first lenticular lens system 100 is parallel to the arrangement direction of each slit in the slit grating 200, and is parallel to the arrangement direction of each cylindrical lens in the second lenticular lens system 300. Specifically, the long axes of the cylindrical lenses of the first cylindrical lens grating 100 are located atyDirection of cylindrical lens inxSequentially arranged in the direction; in the slit grating 200, the long axes of the slits are located at yIn the direction of the slitxSequentially arranged in the direction; the long axes of the individual cylindrical lenses of the second cylindrical lens grating 300 are located atyDirection of cylindrical lens inxAre arranged in sequence in the direction.
The distance from the vertex of each cylindrical lens in the first cylindrical lenticulation 100 to the slit lenticulation 200 is 4.8 mm, which is less than the focal length of the first cylindrical lenticulation 5 mm. As shown in FIG. 1, the vertex of each cylindrical lens of the first cylindrical lenticulation 100 is the cambered surface of the first cylindrical lenticulation 100zThe position of maximum direction.
The distance from the vertex of each cylindrical lens in the second lenticular lens pattern 300 to the diffuse reflection layer 400 is 0.33 mm smaller than the focal length of the second lenticular lens pattern by 0.35 mm. As shown in FIG. 1The vertex of each cylindrical lens of the second lenticular lens pattern 300 is the arc surface of the second lenticular lens pattern 300zThe position of maximum direction.
The width of each slit on the slit grating 200 is 0.07 mm, which is smaller than the pitch 0.15776 mm of the second lenticular lens 300.
The principle of improving the one-dimensional retroreflection performance of the invention is as follows:
1. first lenticular lens 100 forms a first retroreflective structure.
Referring to fig. 2, a point light source 500 is used to represent the light emitted by the projector. The light emitted from the point light source 500 passes through the first cylindrical lenticulation 100 and then irradiates the slit grating 200. Because the invention is applied to projection light field stereoscopic display, the distance from the point light source 500 of the projector to the first cylindrical lens grating 100 is far greater than the focal length of the first cylindrical lens grating 100, so the light rays emitted by the point light source 500 are converged at the plane position of the slit grating 200 after passing through each cylindrical lens in the first cylindrical lens grating 100 to form the slit grating position stripe 201.
Referring to fig. 3, if the slit grating 200 and the second lenticular lens 300 are removed and the diffuse reflection layer 400 is located at the original slit grating position, a conventional one-dimensional retro-reflective structure is formed. The fringes 201 will be diffusely reflected at the slit grating. In the case where the point light source 500 is at a different object distance from the first lenticular lens 100, the width of the fringes formed by the light beams is different and is not 0. Wider stripes will cause the retroreflected light to be more divergent. Specifically, the leftmost light emitted by the point light source 500 passes through the first cylindrical lens grating 100 and then reaches the leftmost position of the stripe 201 at the slit grating, and forms diffuse reflection, and according to the gaussian imaging principle, the beam imaging direction is the direction of a dotted arrow; the rightmost light emitted by the point light source 500 passes through the first cylindrical lens grating 100 and reaches the rightmost part of the stripe 201 at the slit grating, and forms diffuse reflection, and according to the gaussian imaging principle, the light beam imaging direction is the direction of the solid line arrow. Obviously, the shorter the width of the stripe 201 at the slit grating, the closer the two light beams are to the point light source 500. If and only if the width of the stripe 201 at the slit grating approaches to 0, the diffuse reflection light can be projected to the position of the point light source 500 by the first cylindrical lens grating 100 according to the principle that the light path is reversible.
To solve this problem, the present invention provides a second retroreflective structure that provides directionality to the reflected light in the first retroreflective structure, which is equivalent to reducing the stripe width, thereby improving the effect of the first retroreflective structure. Referring to fig. 2, if the reflected light on the stripe 201 at the slit grating has directivity, i.e. the reflected light is reflected according to the original incident direction, the reverse extension lines thereof must converge at the position of the equivalent stripe 202. Obviously, the equivalent stripe 202 has a shorter width, and thus, the light ray has better retroreflection effect.
2. The second lenticular lens 300 and the diffusive reflective layer 400 form a second retroreflective structure.
Referring to fig. 2, light emitted from the point light source 500 passes through the first lenticular lens grating 100 and then irradiates the slit grating 200, and then enters the second lenticular lens grating 300 and the diffuse reflection layer 400 through the slits of the slit grating 200. The second lenticular sheet 300 and the diffusive reflective layer 400 form a second retroreflective structure in accordance with the principles of the first retroreflective structure. After being reflected by the second retro-reflective structure, the light beam is reflected according to the original incident direction, so that the diffuse reflection light in the first retro-reflective structure has directivity.
Further, there is some divergence of the retroreflected light rays, again due to the width of the stripes formed by the light rays on diffuse reflecting layer 400 in the second retroreflected structure. To solve this problem, the slit grating 200 of the present invention forms a diaphragm to confine the diverging light beam, thereby improving the effect of the first and second retro-reflective structures.
3. The slit grating 200 constitutes a diaphragm.
In the present invention, the width of each slit on the slit grating 200 is smaller than the pitch of the second lenticular lens 300, so that it constitutes an aperture stop. After the light emitted from the point light source 500 passes through the first cylindrical lens grating 100 and then irradiates the slit grating 200, the light is incident to the second cylindrical lens grating and the diffuse reflection layer through the slit on the slit grating 200, and the aperture stop limits the light beam and finally reduces the width of the stripe on the diffuse reflection layer. When the reflected light passes through the slit grating 200 again, the aperture diaphragm restricts the light beam again, the light scattering angle range is narrowed, and the retro-reflection effect is optimized finally.
In summary, the reflected light in the first retro-reflective structure is made to be more directional by the second retro-reflective structure, which is equivalent to reducing the stripe size, and the aperture stop formed by the slit grating 200 is used to perform the stripe size constraint again and reduce the light scattering angle range, so that the retro-reflective effect can be effectively optimized when the distance between the projector and the object distance of the lenticular lens grating is different.
Claims (3)
1. A one-dimensional retroreflective sheeting for use in a stereoscopic display of a projected light field, comprising:
the one-dimensional retro-reflection sheet for the projection light field stereoscopic display is composed of a first cylindrical lens grating, a slit grating, a second cylindrical lens grating and a diffuse reflection layer;
the first cylindrical lenticulation, the second cylindrical lenticulation and the diffuse reflection layer are sequentially arranged in front and at the back; the slit grating is arranged in front of the diffuse reflection layer; the arrangement direction of each cylindrical lens in the first cylindrical lens grating is parallel to the arrangement direction of each slit in the slit grating and is parallel to the arrangement direction of each cylindrical lens in the second cylindrical lens grating;
the distance from each cylindrical lens vertex in the first cylindrical lens grating to each cylindrical lens vertex in the second cylindrical lens grating is greater than the focal length of the first cylindrical lens grating, and the distance from each cylindrical lens vertex in the second cylindrical lens grating to the diffuse reflection layer is greater than or equal to the focal length of the second cylindrical lens grating;
the width of each slit on the slit grating is smaller than the pitch of the first cylindrical lens grating or the pitch of the second cylindrical lens grating.
2. The one-dimensional retroreflective sheeting of claim 1 for use in a projected light field stereoscopic display, wherein:
the slit grating is arranged between the first cylindrical lens grating and the second cylindrical lens grating, the distance from the vertex of each cylindrical lens in the first cylindrical lens grating to the slit grating is smaller than or equal to the focal length of the first cylindrical lens grating, and the width of each slit on the slit grating is smaller than the pitch of the second cylindrical lens grating.
3. The one-dimensional retroreflective sheeting of claim 1 for use in a projected light field stereoscopic display, wherein:
if the distance from each cylindrical lens vertex in the first cylindrical lens grating to each cylindrical lens vertex in the second cylindrical lens grating is less than or equal to the focal length of the first cylindrical lens grating, the distance from each cylindrical lens vertex in the second cylindrical lens grating to the diffuse reflection layer is less than the focal length of the second cylindrical lens grating.
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