CN219737981U - Color mixing and light homogenizing system - Google Patents

Abstract

The utility model provides a color mixing and light homogenizing system. The color mixing dodging system comprises: an RGB light source; the Fresnel lens is positioned on the light emitting side of the RGB light source and is used for collimating the light emitted by the RGB light source; the first compound eye element is positioned at one side of the Fresnel lens far away from the RGB light source, the light incident surface of the first compound eye element is provided with a first microstructure surface, the light emergent surface of the first compound eye element is provided with a second microstructure surface, and the first compound eye element is used for diffusing light emitted by the Fresnel lens; the second compound eye element is positioned at one side of the first compound eye element far away from the Fresnel lens, the second compound eye element is provided with a random micro lens array layer, the random micro lens array layer is arranged at one side of the second compound eye element facing the first compound eye element and/or one side of the second compound eye element far away from the first compound eye element, and the second compound eye element is used for mixing light emitted by the first compound eye element. The utility model solves the problem of complex structure of the color mixing and light homogenizing system in the prior art.

Description

Color mixing and light homogenizing system

Technical Field

The utility model relates to the technical field of projection display equipment, in particular to a color mixing and light homogenizing system.

Background

The optical system of the projection optical machine generally comprises a light source, an illumination system, a display chip and a projection lens. The light source used mainly includes an ultra-high pressure mercury lamp, a xenon lamp, a light emitting diode LED, a laser diode LD, etc., and the display chip is classified into CRT, LCD, DLP, LCOS, etc. The illumination system is to concentrate and homogenize the light emitted from the light source to make the energy of the light source utilized to the maximum and to irradiate the display chip homogeneously.

In a color mixing dodging system of an illumination system, main stream dodging devices comprise an integrating rod and a fly eye lens. The fundamental principle of the integrating rod is that light rays are emitted after being reflected for many times in the rod, so that a plurality of light source images are formed to realize energy homogenization. The fly-eye lens is formed by combining a series of small lens units, and the light spots of each small lens unit are overlapped on the target illuminated surface, so that a uniform illumination area is formed. The integrator rod type dodging system needs to design a group of optical lenses between the display chip and the integrator rod outlet, and images light spots at the outlet onto the display chip, so that uniform rectangular illumination is realized. Therefore, for the same illumination requirement, the structure of the dodging system is more complex, the volume is larger, and most micro-projection light machines with compact structures at present generally adopt fly eye lens dodging systems. Fly-eye lens type dodging systems can be divided into two types: one of the single array type and the other of the double array type; the double-array type dodging light path has certain tolerance on the divergence angle of incident light, so that the double-array type dodging light path has more excellent dodging capability. An integrating lens is generally arranged behind the fly-eye lens, and a plurality of sub-beams which are subdivided are overlapped and converged on an image surface so as to realize uniform illumination effect.

That is, the color mixing dodging system in the prior art has a problem of complex structure.

Disclosure of Invention

The utility model mainly aims to provide a color mixing and light homogenizing system so as to solve the problem that the color mixing and light homogenizing system in the prior art has a complex structure.

In order to achieve the above object, the present utility model provides a color mixing dodging system, comprising: an RGB light source; the Fresnel lens is positioned on the light emitting side of the RGB light source and is used for collimating light emitted by the RGB light source; the first compound eye element is positioned at one side of the Fresnel lens far away from the RGB light source, the light incident surface of the first compound eye element is provided with a first microstructure surface, the light emergent surface of the first compound eye element is provided with a second microstructure surface, and the first compound eye element is used for diffusing light emitted by the Fresnel lens; the second compound eye element is positioned at one side of the first compound eye element far away from the Fresnel lens, the second compound eye element is provided with a random micro lens array layer, the random micro lens array layer is arranged at one side of the second compound eye element facing the first compound eye element and/or one side of the second compound eye element far away from the first compound eye element, and the second compound eye element is used for mixing light emitted by the first compound eye element.

Further, the RGB light source is disposed at the focal position of the fresnel lens.

Further, the light incident side and the light emergent side of the first compound eye element are respectively provided with a plurality of micro lens units, the micro lens units on the light incident side are arranged in a rectangular array mode, so that the micro lens units are arranged in the row direction and the column direction which are perpendicular to each other, and the surfaces of the micro lens units arranged in the rectangular array mode are spliced to form a first microstructure surface.

Further, the plurality of microlens units on the light emitting side of the first fly-eye element are arranged in one-to-one correspondence with the plurality of microlens units on the light entering side, and each microlens unit on the light emitting side is offset along the edge position close to the first fly-eye element relative to each microlens unit on the light entering side corresponding to each microlens unit on the light emitting side.

Further, the offset between the group of microlens units near the edge position of the first fly-eye element on the light exit side of the first fly-eye element and the group of microlens units near the edge position of the first fly-eye element on the light entrance side is zero.

Further, the amounts of shift of the plurality of microlens units on the light-emitting side of the first compound eye element in the row direction and the column direction are gradually increased from the edge position of the first compound eye element to the center position of the first compound eye element, so that the light emitted through the first compound eye element is deflected from the center position of the first compound eye element to the edge position, and the deflected angle of the light is gradually reduced from the center position of the first compound eye element to the direction of the edge position.

Further, the microlens units in each column on the light-emitting side of the first fly-eye element have the same offset, and the microlens units in each row have the same offset.

Further, the row pitch of the plurality of microlens units on the light-incident side of the first fly-eye element is different from the row pitch of the plurality of microlens units on the light-exit side, and/or the column pitch of the plurality of microlens units on the light-incident side is different from the column pitch of the plurality of microlens units on the light-exit side.

Further, the surface of the random microlens array layer is formed by splicing a plurality of curved surfaces, and the shape of each curved surface is a convex shape or a concave shape.

Further, the width of the light transmission caliber of the first compound eye element is more than or equal to 5mm and less than or equal to 10mm; and/or the focal length of the first compound eye element is greater than or equal to 0.4mm and less than or equal to 0.9mm.

By applying the technical scheme of the utility model, the color mixing dodging system comprises an RGB light source, a Fresnel lens, a first compound eye element and a second compound eye element, wherein the Fresnel lens is positioned at the light emitting side of the RGB light source and is used for collimating the light emitted by the RGB light source; the first compound eye element is positioned at one side of the Fresnel lens far away from the RGB light source, the light incident surface of the first compound eye element is provided with a first microstructure surface, the light emergent surface of the first compound eye element is provided with a second microstructure surface, and the first compound eye element is used for diffusing light emitted by the Fresnel lens; the second compound eye element is positioned at one side of the first compound eye element far away from the Fresnel lens, the second compound eye element is provided with a random micro-lens array layer, the random micro-lens array layer is arranged at one side of the second compound eye element facing the first compound eye element and/or one side of the second compound eye element far away from the first compound eye element, and the second compound eye element is used for mixing light emitted by the first compound eye element.

The Fresnel lens is arranged on the light emitting side of the RGB light source, so that the Fresnel lens can collimate light emitted by the RGB light source, and the first compound eye element and the second compound eye element are sequentially arranged on the light emitting side of the Fresnel lens, so that collimated light beams which can be incident by the first compound eye element are subdivided, diffused and shaped, and then the second compound eye element carries out secondary light mixing on the subdivided light beams, so that the distribution of an emergent light field is matched with a light-homogenizing design target, and the purpose of color mixing and light homogenizing is achieved. The first micro-structural surface and the second micro-structural surface are respectively arranged on the light incident surface and the light emergent surface of the first compound eye element, so that the two surfaces can be aligned to the straight light beam for diffusion, the display effect that the light beam is concentrated at the center position to cause the final center bright edge to be dark is avoided, and the stability of light beam diffusion is guaranteed. The second compound eye element is provided with a random micro-lens array layer, so that the random micro-lens array layer can deflect the trend of the light path, and the function of homodromous or cross diffusion of light is achieved; the periodicity of the arrangement of the sub-light spots on the receiving surface can be effectively destroyed by adopting a random array mode, and the homogenization treatment of the emergent light is further realized. The utility model can realize collimation, diffusion and light homogenizing treatment of the light of the RGB light source by adopting only three elements, saves parts, saves cost, simplifies structure, further reduces the whole weight of the color mixing and light homogenizing system, and is more beneficial to the application of the color mixing and light homogenizing system in portable products.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic diagram of a color mixing dodging system in accordance with an alternative embodiment of the present utility model;

FIG. 2 shows a schematic view of another angle of the color mixing and homogenizing system of FIG. 1;

FIG. 3 shows a schematic light path diagram of the color mixing and homogenizing system of FIG. 1;

FIG. 4 shows a schematic optical path diagram of the first compound eye element and the second compound eye element of FIG. 1;

FIG. 5 shows a schematic view of the Fresnel lens of FIG. 1;

FIG. 6 shows a schematic view of two side surfaces of the first compound eye element of FIG. 1;

FIG. 7 shows an enlarged view at A in FIG. 6;

FIG. 8 shows an enlarged view at B in FIG. 6;

fig. 9 shows an enlarged view at C in fig. 6;

FIG. 10 shows a schematic optical path diagram of the first compound eye element of FIG. 1;

FIG. 11 shows an enlarged view of a portion of the first compound eye element of FIG. 1;

FIG. 12 shows a schematic structural view of the second compound eye element of FIG. 1;

fig. 13 shows a display effect diagram of a color mixing dodging system in accordance with an alternative embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. an RGB light source; 20. a Fresnel lens; 21. a tooth-like structure; 30. a first compound eye element; 31. a first microstructured surface; 32. a second microstructured surface; 40. a second compound eye element; 41. a random microlens array layer; 50. a row direction; 60. a column direction; 70. a horizontal centerline; 80. a vertical center line.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs unless otherwise indicated.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

In order to solve the problem of complex structure of a color mixing and light homogenizing system in the prior art, the main purpose of the utility model is to provide a color mixing and light homogenizing system.

As shown in fig. 1 to 13, the color mixing dodging system includes an RGB light source 10, a fresnel lens 20, a first compound eye element 30 and a second compound eye element 40, the fresnel lens 20 is located on the light emitting side of the RGB light source 10, and the fresnel lens 20 is used for collimating the light emitted by the RGB light source 10; the first compound eye element 30 is located at one side of the fresnel lens 20 away from the RGB light source 10, the light incident surface of the first compound eye element 30 has a first microstructure surface 31, the light emergent surface of the first compound eye element 30 has a second microstructure surface 32, and the first compound eye element 30 is used for diffusing the light emitted from the fresnel lens 20; the second compound eye element 40 is located at a side of the first compound eye element 30 away from the fresnel lens 20, the second compound eye element 40 has a random microlens array layer 41, the random microlens array layer 41 is disposed at a side of the second compound eye element 40 facing the first compound eye element 30 and/or a side of the second compound eye element 40 away from the first compound eye element 30, and the second compound eye element 40 is used for mixing light emitted from the first compound eye element 30.

The fresnel lens 20 is arranged on the light emitting side of the RGB light source 10, so that the fresnel lens 20 can collimate light emitted by the RGB light source 10, and the first compound eye element 30 and the second compound eye element 40 are sequentially arranged on the light emitting side of the fresnel lens 20, so that collimated light beams which can be incident by the first compound eye element 30 are subdivided, diffused and shaped, and then the second compound eye element 40 performs secondary light mixing on the subdivided light beams, so that the distribution of an emergent light field is matched with a light-homogenizing design target, and the purpose of color mixing and light homogenizing is achieved. The first micro-structural surface 31 and the second micro-structural surface 32 are respectively arranged on the light incident surface and the light emergent surface of the first compound eye element 30, so that the two surfaces can be aligned to the straight light beam for diffusion, the display effect that the light beam is concentrated at the central position to cause the final central bright edge to be dark is avoided, and the stability of light beam diffusion is guaranteed. The second compound eye element 40 has a random microlens array layer 41, so that the random microlens array layer 41 can deflect the direction of the light path to achieve the function of homodromous or cross diffusion of light; the periodicity of the arrangement of the sub-light spots on the receiving surface can be effectively destroyed by adopting a random array mode, and the homogenization treatment of the emergent light is further realized. The utility model can realize collimation, diffusion and light homogenizing treatment of the light of the RGB light source 10 by adopting only three elements, saves parts, saves cost, simplifies structure, further reduces the whole weight of the color mixing and light homogenizing system, and is more beneficial to the application of the color mixing and light homogenizing system in portable products.

As shown in fig. 4 to 4, the three light control elements of the fresnel lens 20, the first compound eye element 30 and the second compound eye element 40, which are sequentially arranged along the light emitting direction of the RGB light source 10, are all designed in a flaking manner, which is beneficial to reducing the structural weight and the overall size of the color mixing dodging system and to better apply the color mixing dodging system to a projection optical machine.

Specifically, the RGB light source 10 provides lambertian red, green and blue three primary color light beams, and three red, green and blue light emitting chips which are linearly arranged can be arranged in the RGB light source 10, and four red, green and blue light emitting chips which are rectangularly arranged can also be arranged in the RGB light source 10, and the light beam with the full angle of half-peak light intensity of 120 degrees is provided. To reduce the effective beam angle incident on the surface of the first fly-eye element 30, the RGB light source 10 is disposed at the focal position of the fresnel lens 20, and the light emitted from the RGB light source 10 is collimated after being refracted by the fresnel lens 20. The first compound eye element 30 subdivides and diffuses and reshapes the incident collimated light beam, and then the second compound eye element 40 secondarily mixes the subdivided sub-light beam to match the outgoing light field distribution with the dodging design target.

As shown in fig. 5, the light incident side or the light emergent side of the fresnel lens 20 has a plurality of tooth-shaped structures 21, the tooth-shaped structures 21 are all annular, the annular tooth-shaped structures 21 are concentrically arranged, in the specific embodiment of the present utility model, the tooth-shaped structures 21 are arranged on the light incident side, the fresnel lens 20 is used as a light collimating device, and is arranged on the downstream light path of the RGB light source 10, and the incident light with a large angle is refracted and converged by the tooth-shaped structures 21 to achieve light beam collimation.

As shown in fig. 6 to 9, the first compound eye element 30 is actually a micro-nano scale structure formed by using a transparent optical sheet as a main body and correspondingly arranging convex micro-lens units according to a certain regular array on two side surfaces of the transparent optical sheet. That is, the microlens units on both the light incident side and the light emergent side are convex in shape. The curved surfaces of the micro lens units at two sides are spherical surfaces, aspheric surfaces or free curved surfaces with the same or similar geometric parameters, and the focal length of the curved surfaces is equal to the interval distance between the first micro structure surface 31 and the second micro structure surface 32 at two sides, namely the thickness of the first compound eye element 30. The micro lens array units are correspondingly arranged on two sides of the first compound eye element 30, so that the color mixing and light homogenizing function similar to the Kohler illumination system is realized. The collimated light beam can be refocused and subdivided into a plurality of sub-beams arranged in an array by a micro-lens unit on the light-entering side of the first fly eye element 30. After the plurality of sub-beams are diffused by the microlens units oppositely disposed on the light-emitting side of the first compound eye element 30, the generated sub-spots are superimposed on each other. Based on the array symmetry of the sub-beams, the energy and color non-uniformity of the sub-beams themselves cancel each other out, and a relatively uniform target spot is finally formed on the receiving surface.

As shown in fig. 6 to 11, each of the light incident side and the light emergent side of the first fly-eye element 30 has a plurality of microlens units, and the plurality of microlens units on the light incident side are arranged in a rectangular array, so that the plurality of microlens units are arranged in a row direction 50 and a column direction 60, which are perpendicular to each other, and surfaces of the plurality of microlens units arranged in the rectangular array are spliced to form the first microstructure surface 31. The plurality of microlens units are arranged in a rectangular array, that is to say, all adjacent microlens units in each row have the same column spacing, all adjacent microlens units in each column have the same row spacing, and the row spacing and the column spacing can be the same or different.

As shown in fig. 10 and 11, the surfaces of the plurality of microlens units on the light exit side of the first compound eye element 30 are spliced to form the second microstructure surface 32, the plurality of microlens units on the light exit side of the first compound eye element 30 are arranged in one-to-one correspondence with the plurality of microlens units on the light entrance side, and each microlens unit on the light exit side is offset along the edge position near the first compound eye element 30 with respect to each microlens unit on the light entrance side corresponding thereto. That is, the microlens unit on the light emitting side of the first compound eye element 30 is arranged offset with respect to the microlens unit on the light entering side.

As shown in fig. 10 and 11, the amounts of shift of the plurality of microlens units on the light-emitting side of the first compound eye element 30 in the row direction 50 and the column direction 60 gradually increase from the edge position of the first compound eye element 30 to the center position of the first compound eye element 30, so that the light emitted through the first compound eye element 30 is deflected from the center position of the first compound eye element 30 to the edge position, and the deflected angle of the light gradually decreases from the center position of the first compound eye element 30 to the direction of the edge position.

Specifically, the amount of shift between the group of microlens units near the center position of the first compound eye element 30 on the light exit side of the first compound eye element 30 and the group of microlens units near the center position of the first compound eye element 30 on the light entrance side is larger than the amount of shift between the group of microlens units near the edge position of the first compound eye element 30 on the light exit side of the first compound eye element 30 and the group of microlens units near the edge position of the first compound eye element 30 on the light entrance side; and the offset between a group of microlens units near the edge position of the first fly-eye element 30 on the light-exit side of the first fly-eye element 30 and a group of microlens units near the edge position of the first fly-eye element 30 on the light-entry side is zero. The microlens cells in each column on the light-emitting side of the first fly-eye element 30 have the same offset, and the microlens cells in each row have the same offset. The row pitch of the plurality of microlens units on the light entrance side of the first fly-eye element 30 is different from the row pitch of the plurality of microlens units on the light exit side, and the column pitch of the plurality of microlens units on the light entrance side is different from the column pitch of the plurality of microlens units on the light exit side.

Specifically, define a firstThe centers of the two side surfaces of the compound eye element 30 are plane coordinate origins, p ₀ 、q ₀ Column pitch and row pitch of microlens cell arrays on the light incident side, respectively, and p is other than the center ₁ 、q ₁ The column pitch and the row pitch of the microlens cell array on the light-emitting side are respectively, and i and j are the column number and the row number of the microlens cell in the row direction 50 and the column direction 60, respectively. The function y=sign (x) is defined, y= -1 when the variable x is positive y=1 and x is negative and y=0 when x is zero.

Specifically, when the number of columns of microlens units on the light-incident side of the first fly eye element 30 is an even number, the column number i of the microlens units in the row direction 50 takes the value-imax, -imax+1, -2, -1, 2, imax-1, imax, where imax is a positive integer greater than 1, and at this time, the column pitch p of the microlens units on the light-incident side ₀ Column pitch p of microlens unit on light-emitting side ₁ And imax satisfy:at this time, the lateral coordinates of each microlens unit on the light incident side are +.>The lateral coordinates of each microlens unit at the light-emitting side are

Specifically, when the number of columns of microlens units on the light-incident side of the first compound eye element 30 is an odd number, the column number i of the microlens units in the row direction 50 takes the value-imax, -imax+1, -2, -1,0,1,2, imax-1, imax, where imax is a positive integer, and at this time, the column pitch p of the microlens units on the light-incident side takes on the value of-imax ₀ Column pitch p of microlens unit on light-emitting side ₁ And imax satisfy:at this time, the lateral coordinate of each microlens unit on the light incident side is p ₀ * i, lateral coordinates of each microlens unit on light-emitting sideIs p ₀ *imax*sign(i)+p ₁ *(i-imax*sign(i))。

Specifically, when the number of rows of microlens units on the light-incident side of the first fly eye element 30 is an even number, the row number j of the microlens units in the column direction 60 takes the value-jmax, -jmax+1, -2, -1, 2, jmax-1, jmax, where jmax is a positive integer greater than 1, and at this time, the row pitch q of the microlens units on the light-incident side ₀ Line pitch p of microlens unit on light-emitting side ₁ And jmax satisfy:at this time, the longitudinal coordinates of each microlens unit on the light incident side are +.>The longitudinal coordinates of each microlens unit at the light-emitting side are

Specifically, when the number of rows of microlens units on the light-incident side of the first fly eye element 30 is an odd number, the row number j of the microlens units in the column direction 60 takes the value-jmax, -jmax+1, -2, -1,0,1,2, jmax-1, jmax, where jmax is a positive integer, and at this time, the row pitch q of the microlens units on the light-incident side takes on the value of-jmax ₀ Line pitch q of microlens unit on light-emitting side ₁ And jmax satisfy:at this time, the longitudinal coordinate of each microlens unit on the light incident side is q ₀ * j, the longitudinal coordinate of each microlens unit on the light-emitting side is q ₀ *jmax*sign(j)+q ₁ *(j-jmax*sign(j))。

In summary, the light incident side and the light emergent side of the first compound eye element 30 are provided with microlens unit arrays opposite to each other in pairs, and the microlens unit arrays are arranged in a progressive staggered manner inwards from the edge position of the first compound eye element 30, so that the first compound eye element 30 can deflect the emergent optical axis of each sub-beam step by step outwards, so that the original energy distribution with high middle and low edge is changed after the sub-beams are mutually overlapped, and the overall illuminance uniformity of the light receiving surface is improved. Meanwhile, beam splitting and shaping are realized through the first micro-structural surface 31 and the second micro-structural surface 32 on two sides of the first compound eye element 30, and the field illumination and the color uniformity can be effectively improved by combining secondary light mixing of the random micro-lens array layer 41 of the second compound eye element 40.

The structural size of the first compound eye element 30 is reasonably controlled according to the apparent volume of the projection optical machine and the constraint of the light transmission aperture of the downstream imaging device. For compact projectors with a small volume, the aperture width of the first compound eye element 30 is generally limited to a range of 5mm or more and 10mm or less. The focal length of the first compound eye element 30 is 0.4mm or more and 0.9mm or less.

The transparent optical sheet of the first compound eye element 30 may be a transparent hard substrate such as glass, or a soft substrate such as PET plastic, etc., and the material of the microlens unit may be epoxy resin or acrylic resin, etc. Based on the effective area range of the display chip and the proper light energy utilization rate, the irradiation light spot is rectangular, and the aspect ratio of the irradiation light spot is consistent with that of the display chip, for example, the aspect ratio of the DMD chip is generally 4:3 or 16:9. to realize rectangular light spots, the plurality of microlens units on the light incident side of the first compound eye element 30 are arranged in a rectangular array, so that the small light-transmitting apertures corresponding to the microlens units are rectangular. The size of the light spot is in direct proportion to the caliber of the micro lens unit, and the caliber of the micro lens unit can be controlled by adjusting the row-column interval and the proportion of the micro lens unit array, so that the irradiation light spots with different sizes can be obtained to meet the purpose of uniformly illuminating the display chip, specifically, the row-column interval p of the display chip ₀ 、q ₀ The values are respectively 0.2mm and 0.15mm.

Specifically, the arrangement of the microlens units on the light-incident side and the light-emergent side of the first compound eye element 30 can realize the outward stepwise deflection of the outgoing optical axis of each sub-beam. The first compound eye element 30 deflects the sub-beam carrying higher energy from the center to the edge, and the deflection angle of the optical axis is larger as the sub-beam approaches the center, so that the sub-beam is overlapped with each other to change the original energy distribution with high middle and low edge, i.e. the energy overlapped at the edge position is increased and the energy overlapped at the center is reducedThereby improving the overall illuminance uniformity of the light receiving surface. To achieve progressive outside-in offset of the microlens cell arrays on both sides of the first fly-eye element 30, the microlens cell arrays have a slightly smaller pitch, such as pitch p, than the light entrance side except for the microlens cells near the horizontal center line 70 and the vertical center line 80 of the light exit side ₁ 、p ₁ The values are respectively 0.199mm and 0.149mm. At this time, the centers of the microlens units at the row and column edge positions on the light emitting side of the first fly-eye element 30 are aligned, and then the row and column offsets of the centers of the corresponding microlens units on both sides of the first fly-eye element 30 are gradually accumulated as they are closer to the center position. That is, with the microlens unit on the light-incident side as a positional reference, the microlens unit on the light-exiting side is offset outwardly from the edge position to the center position of the first compound eye element 30, and the row offset amount and the column offset amount are both gradually increased from zero, with the row-column offset amount being the largest at the center position.

More specifically, for example, when the maximum row numbers imax, jmax of the microlens units are 21, the row pitch p is based on ₀ 、q ₀ 、p ₁ 、q ₁ And taking the value, wherein the maximum row offset and the column offset near the central position of the micro lens unit array are 20 mu m. As is well known, according to the law of refraction and the equation of the curved surface of the microlens, the deflection angle of each sub-beam with respect to the optical axis of incidence when exiting from the light exit surface can be obtained, and the maximum deflection angle is about 15.7 °.

As shown in fig. 3, 4 and 12, the structural size of the second compound eye element 40 is identical to that of the first compound eye element 30, and the surface of the random microlens array layer 41 is formed by splicing a plurality of curved surfaces provided by a plurality of microlenses, and the shape of the curved surface is a convex shape or a concave shape. The main body of the second compound eye element 40 may be a transparent hard substrate such as glass, or a soft substrate such as PET plastic, etc., and the material of the random microlens array layer 41 may be epoxy resin or acrylic resin, etc. The size of the unit caliber of the micro lens can be between 0.1mm and 1 mm. The random microlens array layer 41 may be one layer and disposed on the light incident side or the light emergent side of the second fly-eye element 40, or the random microlens array layer 41 may be two layers, and the light incident side and the light emergent side of the second fly-eye element 40 are respectively provided with the microlens array layer.

In one embodiment, the random microlens array layer 41 may be a layer disposed on the light incident side of the second compound eye element 40, and each microlens has a convex curved surface shape, and the maximum aperture size of the microlens is about 0.53×0.53mm, and the maximum curved surface sagittal height is about 0.062mm. Random microlens array layer 41 randomly deflects and spreads the finely divided sub-beams by interfacial refraction, disrupting the periodicity of the incident sub-beam array, thereby further achieving beam homogenization. The curved surface of the micro lens unit is a spherical surface, an aspherical surface or a free curved surface.

The microlens units on both sides of the first fly-eye element 30 and the random microlens array layer 41 of the second fly-eye element 40 can be prepared by micro-nano optical processing processes such as gray scale lithography, thermal reflow, ion etching, nanoimprint, etc.

In a specific embodiment, as shown in fig. 13, light emitted by the RGB light source 10 is collimated by the fresnel lens 20, and after the first compound eye element 30 and the second compound eye element 40 split, reshape, and mix light secondarily, light intensity distribution with a scattering angle of 20 ° by 25.6 ° can be output, and illuminance uniformity in the effective window is about 82.8%, so that rectangular light spots appear on the illuminated surface.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A color mixing dodging system, comprising:

an RGB light source (10);

a fresnel lens (20), wherein the fresnel lens (20) is located at the light emitting side of the RGB light source (10), and the fresnel lens (20) is used for collimating the light emitted by the RGB light source (10);

a first compound eye element (30), the first compound eye element (30) being located at the Fresnel lens (20) remote from the lens

One side of the RGB light source (10), the light incident surface of the first compound eye element (30) is provided with a first micro-structural surface (31), the light emergent surface of the first compound eye element (30) is provided with a second micro-structural surface (32), and the first compound eye element (30) is used for diffusing the light emitted by the Fresnel lens (20);

the second compound eye element (40), second compound eye element (40) are located first compound eye element (30) keep away from one side of fresnel lens (20), second compound eye element (40) have random microlens array layer (41), random microlens array layer (41) set up second compound eye element (40) towards one side of first compound eye element (30) and/or second compound eye element (40) keep away from one side of first compound eye element (30), second compound eye element (40) are used for carrying out the misce light to the light of first compound eye element (30) outgoing.

2. The color mixing dodging system as claimed in claim 1, characterized in that the RGB light source (10) is arranged at the focal position of the fresnel lens (20).

3. The color mixing dodging system as claimed in claim 1, wherein the light entrance side and the light exit side of the first compound eye element (30) each have a plurality of microlens units, the plurality of microlens units on the light entrance side are arranged in a rectangular array, so that the plurality of microlens units are arranged along a row direction (50) and a column direction (60) perpendicular to each other, and surfaces of the plurality of microlens units arranged in the rectangular array are spliced to form the first microstructure surface (31).

4. A color mixing and homogenizing system according to claim 3, wherein the plurality of microlens units on the light exit side of the first compound eye element (30) are arranged in one-to-one correspondence with the plurality of microlens units on the light entrance side, and each microlens unit on the light exit side is offset along an edge position near the first compound eye element (30) with respect to each microlens unit on the light entrance side corresponding thereto.

5. The color mixing dodging system as claimed in claim 4, wherein an offset between a set of said microlens units on said light exit side of said first compound eye element (30) near an edge position of said first compound eye element (30) and a set of said microlens units on said light entrance side near an edge position of said first compound eye element (30) is zero.

6. The color mixing dodging system as claimed in claim 4, wherein the amounts of shift of the plurality of microlens units on the light exit side of the first compound eye element (30) in the row direction (50) and the column direction (60) are gradually increased from the edge position of the first compound eye element (30) to the center position of the first compound eye element (30) so that the light emitted through the first compound eye element (30) is deflected from the center position of the first compound eye element (30) to the edge position, and the deflected angle of the light is gradually decreased from the center position of the first compound eye element (30) to the direction of the edge position.

7. The color mixing and homogenizing system of claim 6, wherein the microlens units in each column of the light exit side of the first compound eye element (30) have the same offset, and the microlens units in each row have the same offset.

8. A color mixing and homogenizing system as claimed in claim 3, characterized in that a row pitch of the plurality of microlens units on the light entry side of the first compound eye element (30) is different from a row pitch of the plurality of microlens units on the light exit side and/or a column pitch of the plurality of microlens units on the light entry side is different from a column pitch of the plurality of microlens units on the light exit side.

9. The color mixing dodging system as claimed in claim 1, wherein the surface of said random microlens array layer (41) is formed by a plurality of curved surfaces which are convex or concave in shape.

10. The color mixing dodging system as claimed in any one of claims 1 to 9, characterized in that,

the aperture width of the first compound eye element (30) is more than or equal to 5mm and less than or equal to 10mm; and/or

The focal length of the first compound eye element (30) is more than or equal to 0.4mm and less than or equal to 0.9mm.