CN111131804A - Optical path reentry system and construction method thereof - Google Patents
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Abstract
本发明涉及一种光路折返系统，其在LCOS光路中增加一个折射元件。在该折射元件的表面设置多个锯齿状微结构，通过该锯齿状微结构的设置，使得从某些入射方向入射的光线，经过该锯齿状微结构进行至少两次折射，进而改变从所述折射元件射出的光线的出射角度。此光路折返系统的光线走向不依赖偏振态，能够在不使用PBS的情况下，实现LCOS高质量的显示效果，并且针对高亮度的LCOS显示，不受PBS的热稳定性的影响，可以提升对比度。本发明还涉及该光路折返系统的构建方法。
The present invention relates to an optical path reentry system, which adds a refracting element in the LCOS optical path. A plurality of sawtooth-like microstructures are arranged on the surface of the refracting element, and through the arrangement of the sawtooth-like microstructures, light incident from certain incident directions is refracted at least twice through the sawtooth-like microstructures, and then changes from the The exit angle of the light emitted by the refracting element. The light direction of the optical path reentry system does not depend on the polarization state, and can achieve high-quality LCOS display effect without using PBS. For high-brightness LCOS display, it is not affected by the thermal stability of PBS, which can improve the contrast ratio. . The invention also relates to a method for constructing the optical path reentry system.
Description
Technical Field
The invention relates to the field of optics, in particular to a light path folding system and a construction method thereof.
Background
LCOS (liquid Crystal on silicon) belongs to a novel reflection type MICRO LCD projection technology, and the structure thereof is that a driving panel is manufactured on a silicon chip by utilizing a semiconductor manufacturing process, then the driving panel is ground flat on a transistor by a grinding technology, aluminum is plated to be used as a reflector to form a CMOS substrate, then the CMOS substrate is attached to a glass substrate containing a transparent electrode, and then liquid Crystal is injected.
In the conventional LCOS display system, it is usually necessary to adopt a PBS (Polarization Beam Splitter) optical path structure, so the requirement for the optical element is high, and the display effect is not good, which is not good for the development of high brightness product
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an optical path folding system and a construction method thereof, which can realize LCOS high quality display without using PBS, and without depending on polarization state, in view of the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an optical path folding system is constructed, including: the LCOS display chip comprises LCOS display chips and refraction elements which are arranged side by side at intervals, wherein a plurality of sawtooth-shaped microstructures are arranged on the first surface of the refraction element, which is back to the LCOS display chips; incident light rays incident from the sawtooth-shaped microstructures are refracted for the first time and then are emitted from the refraction element to the second surface of the LCOS display chip, and then are reflected by the LCOS display chip, are emitted from the second surface again and are refracted for the second time by the refraction element to be emitted from the first surface; by adjusting the structural parameters of the sawtooth-shaped microstructure, the exit angle of the light rays exiting from the first surface of the refractive element can be changed.
In the light path turning back system, the cross section of the refraction element is a right triangle, the incident light enters from the hypotenuse of the right triangle, is emitted from the long side of the right triangle after being refracted for the first time, is reflected by the LCOS display chip, enters from the long side of the right triangle again, and is emitted from the hypotenuse of the right triangle after being refracted for the second time.
In the optical path folding back system according to the present invention, the exit angle θ of the exit light emitted from the hypotenuse of the right triangle4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1) Wherein the exit angle theta4Indicating the cut of the emergent ray to said sloping edgeThe angle between the lines, theta denotes the smallest acute angle of the right triangle, theta1Representing the angle between the incident ray and the tangent to said hypotenuse, n2Representing the refractive index of said refractive element, n1Representing the refractive index of a material medium located outside the refractive element; the exit angle may be controlled to be within a set range by adjusting the incident angle and the minimum acute angle, and/or the minimum acute angle at the set exit angle and the set incident angle may be calculated by determining the exit angle and the incident angle and manufacturing the refractive element based on the minimum acute angle.
In the optical path folding back system, the material medium is air, n11, tan θ is less than 1/3.
In the optical path folding back system of the present invention, the optical path folding back system further includes an RTIR prism disposed on a propagation optical path of the outgoing light.
In the light path folding back system, the LCOS display chip, the refraction element, and the RTIR prism are sequentially horizontally arranged from bottom to top in the vertical direction, the incident light enters the RTIR prism, enters the refraction element after being reflected by a total reflection interface of the RTIR prism, exits from the second surface of the refraction element after being refracted by the refraction element for the first time, enters again from the second surface after being reflected by the LCOS display chip and exits from the first surface of the refraction element after being refracted by the refraction element for the second time, and the exiting light exits from the RTIR prism in the vertical direction.
In the optical path folding back system according to the present invention, the RTIR prism includes a first prism and a second prism, the first prism and the second prism are sequentially arranged in a staggered manner in a horizontal direction, the incident light enters from a first surface of the first prism, is reflected by a total reflection surface arranged on a second surface of the first prism, and then enters the refraction element, and the emergent light of the refraction element exits in an original propagation direction through the first prism and the second prism.
In the optical path turning-back system, the LCOS display chip, the refraction element and the RTIR prism are sequentially and vertically arranged from left to right in the horizontal direction, the incident light enters the RTIR prism, enters the refraction element through the RTIR prism, is refracted by the refraction element for the first time, then exits from the second surface of the refraction element, is reflected by the LCOS display chip, then enters from the second surface again, is refracted by the refraction element for the second time, and then exits from the first surface, and the exiting light reflects by the total reflection interface of the RTIR prism and exits in the vertical direction.
In the optical path turning-back system, the RTIR prism includes a first prism and a second prism, the first prism and the second prism are attached to each other, the second prism is a right-angle prism and is close to the refraction element, the incident light enters from the first surface of the first prism and sequentially exits from the first prism and the second prism along the original propagation direction, and then enters the refraction element, and the emergent light of the refraction element is reflected by the total reflection surface of the second prism and then exits from the second prism along the vertical direction.
Another technical solution adopted to solve the technical problem of the present invention is to construct a method for constructing a light path folding system, including:
s1, selecting the material of the refractive element to determine the refractive index n of the refractive element2Selecting a material medium located outside the refractive element to determine the refractive index n of the material medium1Determining the exit angle theta of the exiting light4Angle range of and angle of incidence theta of the input light1The angle value range of (1);
s2, according to the formula theta4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1)，θ4Angle range of and theta1Calculating the value range of theta, wherein theta represents the minimum acute angle of the right-angled triangle section of the refraction element;
s3, constructing the refraction element according to the value range of theta;
and S4, constructing a light path folding system based on the refraction element.
By implementing the light path turning-back system and the construction method thereof, the sawtooth-shaped microstructure is arranged on the refraction element, so that incident light is refracted for at least two times, and the emergent angle of light emitted from the first surface of the refraction element is changed, therefore, the light direction of the light path turning-back system does not depend on the polarization state, the high-quality LCOS display effect can be realized under the condition of not using PBS, and the contrast can be improved aiming at the high-brightness LCOS display without being influenced by the thermal stability of the PBS.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural view of an optical path folding system according to a first preferred embodiment of the present invention;
FIG. 2 is a partially enlarged schematic view of a refractive element of the optical path folding system shown in FIG. 1;
fig. 3 is a schematic optical path diagram of an optical path folding system according to a second preferred embodiment of the present invention;
FIG. 4 is a sectional view of a refractive element of the optical path folding system shown in FIG. 3;
FIG. 5 is a schematic structural diagram of an optical path folding system according to a third preferred embodiment of the present invention;
fig. 6 is a schematic structural diagram of an optical path folding system according to a fourth preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention relates to an optical path folding system, which adds a refraction element in an LCOS optical path. The surface of the refraction element is provided with a plurality of sawtooth-shaped microstructures, and the arrangement of the sawtooth-shaped microstructures ensures that light rays incident from certain incidence directions are refracted at least twice through the sawtooth-shaped microstructures, so that the emergent angle of the light rays emitted from the refraction element is changed. The light trend of this light path system of turning back does not rely on the polarization state, can realize the high-quality display effect of LCOS under the condition that does not use PBS to the LCOS display of hi-lite does not receive PBS's thermal stability's influence, can promote the contrast.
Fig. 1 is a schematic structural view of an optical path folding system according to a first preferred embodiment of the present invention. Fig. 2 is a partially enlarged schematic view of a refractive element of the optical path folding system shown in fig. 1. The optical path folding system according to the first preferred embodiment of the present invention will be described below with reference to fig. 1 to 2.
As shown in fig. 1-2, the optical path folding back system of the present invention includes: LCOS display chips 10 and refractive elements 20 are spaced side-by-side. The refractive element 20 is provided with a plurality of sawtooth microstructures 23 facing away from the first surface 21 of the LCOS display chip 10. As shown in fig. 1, the incident light ray a incident from the sawtooth-shaped microstructure 23 is refracted for the first time, then exits from the refractive element 20 facing the second surface 22 of the LCOS display chip 10, and then exits from the first surface 21 after being reflected by the LCOS display chip 10 and then exits from the second surface 22 after being refracted for the second time by the refractive element 20.
In a preferred embodiment of the present invention, the LCOS display chip 10 and the refractive element 20 are preferably horizontally arranged in a vertical direction from bottom to top. In practical applications, the imaging lens may be disposed directly above the refractive element 20 in the vertical direction. The emergent light rays emitted from the second surface 21 of the refraction element 20 need to be within a certain range of emergent angles, so that the requirement of the light-receiving angle of the imaging lens is met. It will be appreciated by those skilled in the art that the LCOS display chip 10 may be any LCOS chip known in the art, and the refractive element 20 may have various types of sawtooth-shaped microstructures, such as triangular shapes, trapezoidal shapes, etc.
As shown in fig. 1-2, the arrangement of the sawtooth-shaped microstructure makes light incident from some incident directions undergo refraction at least twice through the sawtooth-shaped microstructure, so as to obtain a set exit angle of the light emitted from the refraction element. By adjusting the structural parameters of the sawtooth-shaped microstructure 23, the exit angle of the light emitted from the first surface 21 of the refractive element 20 can be changed, so that the exit light meets the light-receiving angle requirement of the imaging lens. Therefore, the light direction of the light path folding system does not depend on the polarization state, the high-quality display effect of the LCOS can be realized under the condition of not using PBS, and the contrast can be improved aiming at the high-brightness LCOS display without being influenced by the thermal stability of the PBS.
Fig. 3 is a schematic optical path diagram of an optical path folding system according to a second preferred embodiment of the present invention. Fig. 4 is a sectional view of a refractive element of the optical path folding system shown in fig. 3. In a preferred embodiment shown in fig. 3-4, the light path folding system of the present invention comprises: LCOS display chips 10 and refractive elements 20 are spaced side-by-side. The refractive element 20 is provided with a plurality of sawtooth microstructures 23 facing away from the first surface 21 of the LCOS display chip 10. As shown in fig. 3-4, in the preferred embodiment, the cross-section of the refractive element 20 in which the saw-tooth like microstructure 23 is arranged is a right triangle, comprising a hypotenuse 231, a short side 232 and a long side 233. As shown in fig. 3, the incident light ray a enters from the hypotenuse 231 of the right triangle, and exits from the long side 233 of the right triangle after being refracted for the first time, and then enters again from the long side 233 of the right triangle after being reflected by the LCOS display chip 10, and exits from the hypotenuse 231 of the right triangle after being refracted for the second time, so as to form an exiting light ray B.
As shown in FIG. 3, the exit angle θ is used4Representing the angle between the outgoing ray and the tangent to the hypotenuse 231, theta representing the smallest acute angle of the right triangle, theta1Representing the angle between the incident ray and the tangent of said hypotenuse 231, n2Representing the refractive index, n, of said refractive element 201Representing the refractive index, theta, of a material medium located outside the refractive element 202And theta3Respectively representing the angle between the refracted light in the refractive element and the tangent of said sloping side 231, it is possible to obtain, by geometrical optics principles:
Sin(θ1)/Sin(θ2)＝n2/n1，
θ2＝arcsin(Sin(θ1)*n1/n2)
θ3＝2θ-θ2
＝2θ-arcsin(Sin(θ1)*n1/n2)
Sin(θ3)/Sin(θ4)＝n1/n2
θ4＝arcsin(Sin(θ3)*n2/n1)
＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1)
thus, θ can be obtained4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1). I.e. the exit angle theta4The smallest acute angle theta with the right triangle, the refractive index n of the refractive element 202Refractive index n of a material medium other than the refractive element 201And angle of incidence theta1And (4) correlating. Typically, the material medium outside the refractive element 20 is air, i.e. n11, and the refractive index n of the refractive element 202May be determined by the choice of material for the refractive element 20. The exit angle theta is considered from the light receiving angle of the imaging lens4The light receiving angle requirement of the imaging lens can be met only by meeting a certain condition. The exit angle theta is generally required4Is 90 degrees, i.e. the outgoing light is the light that enters the imaging lens perpendicularly. Or the exit angle theta4Within a set range, such as 80 degrees to 100 degrees from horizontal, and so on. Incident angle theta1The position of the light source can be determined according to actual needs, and the like. Therefore, the light source can be adjusted according to the emergent angle theta4Angle range of and theta1The value range of theta is calculated. When the emergent angle theta4Refractive index n of said refractive element 201And angle of incidence theta1When the angle is determined, the minimum acute angle θ of the optimal right triangle can be calculated.
Referring to fig. 4, when the length of the short side 232 of the right triangle is represented by Δ H and the length of the long side 233 is represented by L, tan θ is Δ H/L. The Δ H is controlled to be less than 0.01mm in general, depending on the focal length and depth of field of the imaging lens. Since Δ H affects the imaging quality of a picture, a smaller Δ H value is better. Due to the refractive index n of the refractive element 202With a refractive index n higher than that of a material medium (preferably air) other than the refractive element 201(preferably n)11). Thus n is2Ratio n1The larger the angle θ is, the smaller the minimum acute angle θ of the right triangle is, the higher the light passing ratio of the incident light to the effective surface (i.e., the hypotenuse 231 of the right triangle) is, the greater the regularity of the change of the light after passing through the refractive element 20 is, and the better the imaging effect is. Therefore, the refractive element 20 is preferably made of a material having a high refractive index. In a preferred embodiment of the present invention, tan θ is less than 1/3.
According to the implementation of the light path turning-back system, the sawtooth-shaped microstructures are arranged on the refraction element, so that incident light is refracted at least twice, the emergent angle of light emitted from the first surface of the refraction element is changed, the light direction of the light path turning-back system does not depend on the polarization state, the high-quality display effect of LCOS can be realized under the condition that PBS is not used, the high-brightness LCOS display is not influenced by the thermal stability of PBS, and the contrast can be improved.
Fig. 5 is a schematic structural diagram of an optical path folding system according to a third preferred embodiment of the present invention. As shown in fig. 5, the optical path folding back system of the present invention includes: LCOS display chips 10, refractive element 20, and RTIR prism 30 are spaced side-by-side. In the embodiment shown in fig. 5, the arrangement of the LCOS display chip 10 and the refractive element 20 can be as described with reference to the embodiments shown in fig. 1 to 4, and will not be described again here. In the present embodiment, the RTIR prism 30 will be mainly explained in detail.
As shown in fig. 5, the LCOS display chip 10, the refractive element 20, and the RTIR prism 30 are horizontally disposed in sequence from bottom to top in the vertical direction. In the present embodiment, the RTIR prism 30 includes a first prism 31 and a second prism 32. The cross sections of the first prism 31 and the second prism 32 are obtuse triangles with equal size. The first prism 31 and the second prism 32 are sequentially arranged in a staggered manner in the horizontal direction.
As shown in fig. 5, the incident light is horizontally incident from a first surface (as shown, a short side of the obtuse triangle) of the first prism 31, thus being irradiated onto a second surface (as shown, a hypotenuse of the obtuse triangle) of the first prism 31, and is reflected by a total reflection surface provided on the second surface of the first prism 31 and then is downwardly incident into the refracting element 20.
In this embodiment, the refractive element 20 is constructed in accordance with the embodiment shown in fig. 1-4. Therefore, the incident light entering the refraction element 20 is refracted by the refraction element 20 for the first time, then exits from the second surface of the refraction element 20, is reflected by the LCOS chip 10, then exits from the second surface again, is refracted by the refraction element 20 for the second time, and then exits from the first surface of the refraction element 20, and the exiting light exits upward and again enters the first prism 31, and then passes through the first prism 31 and the second prism 32 along the original propagation direction to be propagated.
As shown in fig. 5, the imaging lens 40 may be disposed directly above the refractive element 20 in the vertical direction. The emergent light emitted from the second surface of the refractive element 20 needs to be within a certain range of emergent angles, so as to meet the requirement of the light-receiving angle of the imaging lens 40, which can be achieved by the arrangement of the zigzag microstructure of the refractive element as described above, and thus, the description is omitted.
It will be appreciated by those skilled in the art that other prisms or optics may be provided between the optical lens 40 and the refractive element 20 in addition to the RTIR prism 30.
According to the invention, through the arrangement of the sawtooth-shaped microstructure, light rays incident from certain incident directions are refracted at least twice through the sawtooth-shaped microstructure, and further a set emergent angle of the light rays emitted from the refraction element is obtained. By adjusting the structural parameters of the sawtooth-shaped microstructure, the emergent angle of the light emitted from the refraction element can be changed, so that the emergent light meets the requirement of the light receiving angle of the imaging lens. Therefore, the light direction of the light path folding system does not depend on the polarization state, the high-quality display effect of the LCOS can be realized under the condition of not using PBS, and the contrast can be improved aiming at the high-brightness LCOS display without being influenced by the thermal stability of the PBS. Further, by using the RTIR prism 30, the light-equalizing effect can be improved.
Fig. 6 is a schematic structural diagram of an optical path folding system according to a fourth preferred embodiment of the present invention. As shown in fig. 6, the optical path folding back system of the present invention includes: LCOS display chips 10, refractive element 20, and RTIR prism 30 are spaced side-by-side. In the embodiment shown in fig. 6, the arrangement of the LCOS display chip 10 and the refractive element 20 can be as described with reference to the embodiments shown in fig. 1 to 4, and will not be described again here. In this embodiment, the embodiment of FIG. 6 is similar to the embodiment of FIG. 5, except that the RTIR prism 30 is configured and arranged differently.
As shown in fig. 6, the LCOS display chip 10, the refractive element 20, and the RTIR prism 30 are vertically arranged in order from left to right in a horizontal direction. In the present embodiment, the RTIR prism 30 includes a first prism 31 and a second prism 32. The first prism 31 preferably has a cross section of an acute triangle, but may have other shapes, and the second prism 32 preferably has a cross section of a right triangle and is disposed adjacent to the refractive element 20. The first prism 31 is disposed close to the incident light.
As shown in fig. 6, the incident light enters a first surface (a first side of the acute triangle as shown) of the RTIR prism 30, then exits the first prism 31 and the second prism 32 in sequence along the original propagation direction, and enters the refractive element 20, and the incident light exits from a second surface of the refractive element 20 after being refracted for the first time by the refractive element 20. The emergent light is reflected by the LCOS chip 10, then re-enters from the second surface, and is refracted by the refraction element 20 for the second time, and then exits from the first surface, the emergent light of the refraction element 20 enters from the first surface of the second prism 32 (shown as a right-angle side in fig. 6), and then irradiates to the second surface of the second prism 32 (shown as a hypotenuse of a right-angled triangle), and exits from the second prism 32 in the vertical direction after being reflected by a total reflection surface arranged on the second surface of the second prism 32.
As shown in fig. 6, the imaging lens 40 may be disposed directly above the refractive element 20 in the vertical direction. The emergent light emitted from the second surface of the refractive element 20 needs to be within a certain range of emergent angles, so as to meet the requirement of the light-receiving angle of the imaging lens 40, which can be achieved by the arrangement of the zigzag microstructure of the refractive element as described above, and thus, the description is omitted.
It will be appreciated by those skilled in the art that other prisms or optics may be provided between the optical lens 40 and the refractive element 20 in addition to the RTIR prism 30.
According to the invention, through the arrangement of the sawtooth-shaped microstructure, light rays incident from certain incident directions are refracted at least twice through the sawtooth-shaped microstructure, and further a set emergent angle of the light rays emitted from the refraction element is obtained. By adjusting the structural parameters of the sawtooth-shaped microstructure, the emergent angle of the light emitted from the refraction element can be changed, so that the emergent light meets the requirement of the light receiving angle of the imaging lens. Therefore, the light direction of the light path folding system does not depend on the polarization state, the high-quality display effect of the LCOS can be realized under the condition of not using PBS, and the contrast can be improved aiming at the high-brightness LCOS display without being influenced by the thermal stability of the PBS. Further, by using the RTIR prism 30, the light-equalizing effect can be improved.
The invention also provides a construction method for constructing the light path reentry system, which comprises the following steps. In step S1, the material of the refractive element 20 is selected to determine the refractive index n of the refractive element 202Selecting a material medium located outside the refractive element 20 to determine the refractive index n of the material medium1Determining the exit angle theta of the exiting light4Angle range of and angle of incidence theta of the input light1The angle value range of (1).
In step S2, according to the formulaθ4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1)，θ4Angle range of and theta1The angular span of theta, where theta represents the smallest acute angle of the right triangle cross-section of the refractive element 20, is calculated.
In step S3, the refractive element 20 is constructed according to the value range of θ.
In step S4, the optical path folding system according to the embodiment shown in fig. 1 to 6 is constructed based on the refractive element 20.
It is known to those skilled in the art that the construction method of the optical path folding back system of the present invention can be implemented with reference to the embodiments shown in fig. 1 to 6. Based on the teaching of the present invention, those skilled in the art can implement the construction method of the optical path folding system.
According to the construction method of the light path turn-back system, the sawtooth-shaped microstructures are arranged on the refraction element, so that incident light is refracted for at least two times, and the emergent angle of light emitted from the first surface of the refraction element is changed, therefore, the light direction of the light path turn-back system does not depend on the polarization state, the high-quality display effect of LCOS can be realized under the condition that PBS is not used, the high-brightness LCOS display is not influenced by the thermal stability of PBS, and the contrast can be improved.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An optical path folding back system, comprising: the LCOS display chip comprises LCOS display chips and refraction elements which are arranged side by side at intervals, wherein a plurality of sawtooth-shaped microstructures are arranged on the first surface of the refraction element, which is back to the LCOS display chips; incident light rays incident from the sawtooth-shaped microstructures are refracted for the first time and then are emitted from the refraction element to the second surface of the LCOS display chip, and then are reflected by the LCOS display chip, are emitted from the second surface again and are refracted for the second time by the refraction element to be emitted from the first surface; by adjusting the structural parameters of the sawtooth-shaped microstructure, the exit angle of the light rays exiting from the first surface of the refractive element can be changed.
2. The optical path folding system according to claim 1, wherein the cross section of the refraction element is a right triangle, and the incident light enters from the hypotenuse of the right triangle and exits from the long side of the right triangle after being refracted for the first time, and enters from the long side of the right triangle again after being reflected by the LCOS display chip and exits from the hypotenuse of the right triangle after being refracted for the second time.
3. The optical path folding system according to claim 2, wherein an exit angle θ of the exit ray emitted from the hypotenuse of the right triangle4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1) Wherein the exit angle theta4Representing the angle between the outgoing ray and the tangent to the hypotenuse, theta representing the smallest acute angle of the right triangle, theta1Representing the angle between the incident ray and the tangent to said hypotenuse, n2Representing the refractive index of said refractive element, n1Representing the refractive index of a material medium located outside the refractive element; the emergent angle can be controlled to be within a set range by adjusting the incident angle and the minimum acute angle, and/or the emergent angle and the incident angle can be calculated to be within a set emergent angleThe angle and a minimum acute angle setting the angle of incidence and manufacturing the refractive element based on the minimum acute angle.
4. The optical path folding system according to claim 3, wherein the material medium is air, n is11, tan θ is less than 1/3.
5. The optical path folding-back system according to claim 4, further comprising an RTIR prism disposed on a propagation path of the outgoing light.
6. The optical path folding back system according to any one of claims 1 to 5, wherein the LCOS display chip, the refraction element, and the RTIR prism are horizontally disposed in a vertical direction from bottom to top, the incident light enters the RTIR prism, enters the refraction element after being reflected by a total reflection interface of the RTIR prism, exits from the second surface of the refraction element after being refracted by the refraction element for the first time, enters again from the second surface after being reflected by the LCOS display chip, exits from the first surface of the refraction element after being refracted by the refraction element for the second time, and exits from the RTIR prism in the vertical direction.
7. The optical path folding-back system according to claim 6, wherein the RTIR prism includes a first prism and a second prism, the first prism and the second prism are arranged in a staggered manner in the horizontal direction, the incident light enters from the first surface of the first prism, and enters the refraction element after being reflected by a total reflection surface arranged on the second surface of the first prism, and the emergent light of the refraction element exits in the original propagation direction through the first prism and the second prism.
8. The optical path folding back system according to any one of claims 1 to 5, wherein the LCOS display chip, the refraction element, and the RTIR prism are vertically disposed in a horizontal direction from left to right in sequence, the incident light enters the RTIR prism, enters the refraction element through the RTIR prism, exits from the second surface of the refraction element after being refracted by the refraction element for the first time, enters again from the second surface after being reflected by the LCOS display chip and exits from the first surface after being refracted by the refraction element for the second time, and the exiting light exits in a vertical direction after being reflected by the total reflection interface of the RTIR prism.
9. The optical path folding system according to claim 7, wherein the RTIR prism includes a first prism and a second prism, the first prism and the second prism are disposed in a bonded manner, the second prism is a right-angle prism and is close to the refraction element, the incident light enters from the first surface of the first prism, sequentially exits from the first prism and the second prism along the original propagation direction, and then enters the refraction element, and the emergent light of the refraction element is reflected by the total reflection surface of the second prism and then exits from the second prism along the vertical direction.
10. A method for constructing an optical path folding system, comprising:
s1, selecting the material of the refractive element to determine the refractive index n of the refractive element2Selecting a material medium located outside the refractive element to determine the refractive index n of the material medium1Determining the exit angle theta of the exiting light4Angle range of and angle of incidence theta of the input light1The angle value range of (1);
s2, according to the formula theta4＝arcsin(Sin(2θ-arcsin(Sin(θ1)*n1/n2))*n2/n1)，θ4Angle range of and theta1Calculating the value range of theta, wherein theta represents the minimum acute angle of the right-angled triangle section of the refraction element;
s3, constructing the refraction element according to the value range of theta;
s4, constructing the optical path folding system according to any one of claims 1 to 9 based on the refractive element.
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| CN202010035202.5A CN111131804A (en) | 2020-01-13 | 2020-01-13 | Optical path reentry system and construction method thereof |
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