CN211089823U - Light path system of turning back - Google Patents
Light path system of turning back Download PDFInfo
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- CN211089823U CN211089823U CN202020076424.7U CN202020076424U CN211089823U CN 211089823 U CN211089823 U CN 211089823U CN 202020076424 U CN202020076424 U CN 202020076424U CN 211089823 U CN211089823 U CN 211089823U
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Abstract
The utility model relates to a light path system of turning back, it increases a refracting element in L COS light path sets up a plurality of cockscomb structure micro-structures on this refracting element's surface, through the setting of this cockscomb structure micro-structure for from the light of certain incident direction incident, carry out twice refraction at least through this cockscomb structure micro-structure, and then change and follow the exit angle of the light that refracting element jetted out, this light path system of turning back moves towards and does not rely on the polarization state, can be under the condition that does not use PBS, realizes the high-quality display effect of L COS, and show to the L COS of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast.
Description
Technical Field
The utility model relates to an optics field, more specifically say, relate to a light path system of turning back.
Background
L COS (L acquired Crystal on Silicon) belongs to a novel reflection type MICRO L CD projection technology, and the structure is that a driving panel is manufactured on a Silicon chip by utilizing a semiconductor manufacturing process, then the driving panel is ground on a transistor through 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 L COS display system, a PBS (Polarization Beam Splitter) optical path structure is usually adopted, so that the requirement for the optical components is high, the display effect is not good, and the development of high-brightness products is not facilitated
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide one kind and need not to adopt PBS, do not rely on the polarization state, consequently can realize L COS high quality display's light path system of turning back under the condition that does not use PBS.
The technical scheme that the technical problem is solved is that a light path turn-back system is constructed, the light path turn-back system comprises L COS display chips and refraction elements which are arranged side by side at intervals, wherein the refraction elements are back to a first surface of the L COS display chips and are provided with a plurality of sawtooth-shaped microstructures, incident light rays which are incident from the sawtooth-shaped microstructures are refracted for the first time and then are emitted from the refraction elements to a second surface of the L COS display chips, and then are reflected by the L COS display chips and then are emitted from the second surface again and are refracted by the refraction elements for the second time and then are emitted from the first surface.
In the light path system of turning back, the cross-section of refraction component is right triangle, incident light follows right triangle's hypotenuse is jeted into and is followed after the refraction for the first time right triangle's long limit jets out, passes through again L COS display chip reflects the back follow right triangle's long limit jets into once more and follows after the refraction for the second time right triangle's hypotenuse jets out.
In the light path folding back system of the present invention, the angle θ of the outgoing light 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 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 light path turning back system of the present invention, the material medium is air, and n is11, tan θ is less than 1/3.
In the light path system of turning back, further including setting up the RTIR prism on the propagation light path of emergent ray.
In the light path system of turning back, L COS display chip refraction component with the RTIR prism from the bottom up level setting in proper order on vertical direction, incident light jets into the RTIR prism, and jet into after the total reflection interface reflection of RTIR prism refraction component, the warp follow after the refraction component first refraction the refraction component the second surface jets out, passes through again after L COS display chip reflects the follow the second surface jets in and passes through again follow behind the refraction component second refraction the refraction component the first surface jets out, emergent light passes through the RTIR prism jets out in vertical direction.
In the light path system of turning back, the RTIR prism includes first prism and second prism, first prism with the second prism misplaces in proper order on the horizontal direction and sets up, incident light follows first face of first prism is kicked into and is in through the setting jet into after the total reflection surface reflection on the second face of first prism refractive element, refractive element's emergent light warp first prism with the second prism jets out along former direction of propagation.
In the light path system of turning back, L COS display chip refraction component with the RTIR prism from left to right vertical setting in proper order on the horizontal direction, incident light jets into the RTIR prism, warp the RTIR prism jets into refraction component passes through again after refraction component refracts for the first time follow refraction component's second surface jets out, passes through again behind the L COS display chip reflection follow the second surface jets into again and passes through follow behind the refraction component refraction second time follow the first surface jets out, emergent light passes through jet out in vertical direction behind the total reflection interface reflection of RTIR prism.
In the light path system of turning back, the RTIR prism includes first prism and second prism, first prism with the second prism laminating sets up just the second prism is right angle prism and is close to refraction component, incident light follows the first face of first prism is jeted into and is jeted out along former direction of propagation in proper order first prism with the second prism reeves refraction component, refraction component's emergent light warp jet out along vertical direction after the total reflection surface reflection of second prism the second prism.
Implement the utility model discloses a light path system of turning back through set up the cockscomb structure microstructure on refractive element to carry out refraction twice at least to the incident light, and then change and follow the exit angle of the light that refractive element's first surface jetted out, therefore the light of light path system of turning back moves towards independent polarization state, can realize L COS high-quality display effect under the condition that does not use PBS, and to the L COS demonstration of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram 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 a light 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 clearly understood, the present invention is further described in 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 utility model relates to a light path system of turning back, it increases a refracting element in L COS light path sets up a plurality of cockscomb structure micro-structures on this refracting element's surface, through the setting of this cockscomb structure micro-structure for from the light of certain incident direction incident, carry out twice refraction at least through this cockscomb structure micro-structure, and then change and follow the exit angle of the light that refracting element jetted out, this light path system of turning back moves towards and does not rely on the polarization state, can be under the condition that does not use PBS, realizes the high-quality display effect of L COS, and show to the L COS of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast.
Fig. 1 is a schematic structural diagram 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 light path turning back system of the present invention comprises L COS display chip 10 and refractive element 20 arranged side by side at intervals, wherein the refractive element 20 is provided with a plurality of serrated microstructures 23 facing away from the first surface 21 of the L COS display chip 10, as shown in fig. 1, an incident light ray a incident from the serrated microstructures 23 is refracted for the first time and then emitted from the refractive element 20 to the second surface 22 of the L COS display chip 10, and then reflected by the L COS display chip 10, and then emitted from the second surface 22 again, and then emitted from the first surface 21 after being refracted for the second time by the refractive element 20.
In the preferred embodiment of the present invention, the L COS display chip 10 and the refractive element 20 are preferably horizontally disposed in a vertical direction from bottom to top in order, in practical applications, an imaging lens may be disposed right above the refractive element 20 in a vertical direction, the emergent light emitted from the second surface 21 of the refractive element 20 needs to be within a certain range of emergent angle, so as to satisfy the light-receiving angle requirement of the imaging lens.
As shown in FIG. 1-2, the light incident from some incident directions is refracted at least twice through the saw-toothed microstructure by the saw-toothed microstructure, so as to obtain the set outgoing angle of the light emitted from the refraction element, the outgoing angle of the light emitted from the first surface 21 of the refraction element 20 can be changed by adjusting the structural parameters of the saw-toothed microstructure 23, so that the outgoing light meets the requirement of the light receiving angle of the imaging lens, therefore, the light direction of the light path folding system of the utility model is independent of the polarization state, the high-quality display effect of L COS can be realized without using PBS, and the contrast can be improved without being influenced by the thermal stability of PBS for the L COS display with high brightness.
Fig. 3 is a schematic light path diagram of a light 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 light path folding system shown in fig. 3, in the preferred embodiment shown in fig. 3-4, the light path folding system of the present invention includes L COS display chip 10 and a refractive element 20 spaced side by side, the refractive element 20 is provided with a plurality of saw-toothed microstructures 23 facing away from the first surface 21 of the L COS display chip 10, as shown in fig. 3-4, in the preferred embodiment, the refractive element 20 provided with the saw-toothed microstructures 23 has a cross-section of a right triangle including a hypotenuse 231, a short side 232, and a long side 233, as shown in fig. 3, the incident light a is incident from the hypotenuse 231 of the right triangle and is emitted from the long side 233 of the right triangle after being refracted for the first time, and is reflected from the L COS display chip 10 again, and is emitted from the long side 231 of the right triangle after being refracted for the second time to form an emergent hypotenuse 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, the size of tan θ ═ Δ H/L can be obtained, and 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 used, and the smaller the Δ H value is, the better the refractive index n of the refractive element 20 is2With 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 preferablyA material with a high refractive index is used. In a preferred embodiment of the present invention, tan θ is less than 1/3.
Implement the utility model discloses a light path system of turning back through set up the cockscomb structure microstructure on refractive element to carry out refraction twice at least to the incident light, and then change and follow the exit angle of the light that refractive element's first surface jetted out, therefore the light of light path system of turning back moves towards independent polarization state, can realize L COS high-quality display effect under the condition that does not use PBS, and to the L COS demonstration of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast.
Fig. 5 is a schematic structural diagram of a light path folding back system according to a third preferred embodiment of the present invention, as shown in fig. 5, the light path folding back system of the present invention includes a L COS display chip 10, a refractive element 20 and an RTIR prism 30, which are arranged side by side at intervals, in the embodiment shown in fig. 5, the arrangement of the L COS display chip 10 and the refractive element 20 can refer to the embodiment shown in fig. 1-4, and will not be described again.
As shown in FIG. 5, the L COS display chip 10, the refraction element 20 and the RTIR prism 30 are horizontally arranged from bottom to top in the vertical direction, in this embodiment, the RTIR prism 30 comprises a first prism 31 and a second prism 32, the first prism 31 and the second prism 32 are obtuse triangles with equal cross sections, and 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 to 4, so that the incident light entering the refractive element 20 is refracted by the refractive element 20 for the first time, then exits from the second surface of the refractive element 20, is reflected by the L COS display chip 10, then enters again from the second surface, is refracted by the refractive element 20 for the second time, exits from the first surface of the refractive element 20, and exits upward and enters again into the first prism 31, and then passes through the first prism 31 and the second prism 32 along the original propagation direction.
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.
The utility model discloses a setting of this cockscomb structure microstructure for the light from certain incident direction incident carries out twice refraction at least through this cockscomb structure microstructure, and then obtains the follow the settlement exit angle of the light that refraction component jetted out, through adjusting cockscomb structure's structural parameter can change the follow the exit angle of the light that refraction component jetted out, thereby make exit light satisfy imaging lens's receipts light angle requirement, consequently, the utility model discloses a light path turns back the light trend of system and does not rely on the polarization state, can realize L COS high-quality display effect under the condition that does not use PBS, and to the L COS demonstration of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast, furtherly, through adopting RTIR prism 30, can promote even light effect.
Fig. 6 is a schematic structural view of a light path folding system according to a fourth preferred embodiment of the present invention, as shown in fig. 6, the light path folding system of the present invention includes L COS display chip 10, refractive element 20 and RTIR prism 30 which are arranged side by side at intervals, in the embodiment shown in fig. 6, the arrangement of the said L COS display chip 10 and refractive element 20 can refer to the embodiment shown in fig. 1-4, and will not be described again.
As shown in FIG. 6, the L COS display chip 10, the refractive element 20, and the RTIR prism 30 are vertically arranged in a horizontal direction from left to right, in this embodiment, the RTIR prism 30 includes a first prism 31 and a second prism 32. the first prism 31 is preferably acute triangular in cross-section, but may be other shapes, and the second prism 32 is preferably right triangular in cross-section and is disposed adjacent to the refractive element 20. the first prism 31 is disposed adjacent to an incident light ray.
As shown in fig. 6, the incident light enters the first surface of the RTIR prism 30 (as shown in the first side of the acute triangle), and then exits the first prism 31 and the second prism 32 in sequence along the original propagation direction, and then enters the refractive element 20, the incident light exits from the second surface of the refractive element 20 after being refracted for the first time by the refractive element 20, the exiting light exits from the second surface after being reflected by the L COS display chip 10, and exits from the first surface after being refracted for the second time by the refractive element 20, the exiting light of the refractive element 20 enters from the first surface of the second prism 32 (as shown in the right-angle side in fig. 6), and thus irradiates the second surface of the second prism 32 (as shown in the hypotenuse of the right-angle triangle), and exits the second prism 32 in the vertical direction after being reflected by the total reflection surface provided 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.
The utility model discloses a setting of this cockscomb structure microstructure for the light from certain incident direction incident carries out twice refraction at least through this cockscomb structure microstructure, and then obtains the follow the settlement exit angle of the light that refraction component jetted out, through adjusting cockscomb structure's structural parameter can change the follow the exit angle of the light that refraction component jetted out, thereby make exit light satisfy imaging lens's receipts light angle requirement, consequently, the utility model discloses a light path turns back the light trend of system and does not rely on the polarization state, can realize L COS high-quality display effect under the condition that does not use PBS, and to the L COS demonstration of hi-lite, do not receive PBS's thermal stability's influence, can promote the contrast, furtherly, through adopting RTIR prism 30, can promote even light effect.
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 exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A light path turning-back system is characterized by comprising L COS 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 L COS display chip, incident light rays incident from the sawtooth-shaped microstructures are refracted for the first time, then are emitted from the refraction element to the second surface of the L COS display chip, are reflected by the L COS display chip, then are emitted from the second surface again, are refracted for the second time by the refraction element, and then are emitted from the first surface.
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 the first refraction, and enters from the long side of the right triangle again after being reflected by the L COS display chip and exits from the hypotenuse of the right triangle after the second refraction.
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, n1Indicating the refractive index of the material medium located outside the refractive element.
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 claim 5, wherein the L COS display chip, the refraction element and the RTIR prism are horizontally arranged in a vertical direction from bottom to top, the incident light beam 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 L COS 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 claim 5, wherein the L COS display chip, the refraction element and the RTIR prism are vertically arranged in a horizontal direction from left to right, 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 L COS 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 a 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.
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