WO2021097747A1 - Élément de réseau de microlentilles et diffuseur, et dispositif électronique - Google Patents

Élément de réseau de microlentilles et diffuseur, et dispositif électronique Download PDF

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Publication number
WO2021097747A1
WO2021097747A1 PCT/CN2019/119882 CN2019119882W WO2021097747A1 WO 2021097747 A1 WO2021097747 A1 WO 2021097747A1 CN 2019119882 W CN2019119882 W CN 2019119882W WO 2021097747 A1 WO2021097747 A1 WO 2021097747A1
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WO
WIPO (PCT)
Prior art keywords
microlens array
array element
microlens
microlenses
element according
Prior art date
Application number
PCT/CN2019/119882
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English (en)
Chinese (zh)
Inventor
陈冠宏
李宗政
Original Assignee
南昌欧菲生物识别技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 南昌欧菲生物识别技术有限公司 filed Critical 南昌欧菲生物识别技术有限公司
Priority to PCT/CN2019/119882 priority Critical patent/WO2021097747A1/fr
Publication of WO2021097747A1 publication Critical patent/WO2021097747A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses

Definitions

  • the invention relates to the field of biological recognition, and in particular to a microlens array element, a diffusion sheet and an electronic device.
  • the diffuser in time of flight generally uses DOE (diffractive optical element) technology and MLA (micro lens array) technology to project light.
  • DOE diffractive optical element
  • MLA micro lens array
  • the DOE technology uses the principle of diffractive optics to diffract the laser light into the target area, but because of the large angle, it is difficult to design and manufacture, and its energy efficiency is low, and there is more stray light around the effective area as a whole.
  • MLA technology can use a closely arranged lens array to refract the light emitted by the light source into the corresponding effective area.
  • the microlens array not only has the basic functions of traditional lenses such as focusing and imaging, but also has the characteristics of small unit size and high integration, so that it can perform functions that traditional optical elements cannot perform, and can form many new types of optical components. system.
  • the parameters of the microlens array must be designed to meet the range of the field of view, to ensure the uniformity of the illuminance within the field of view, and to maintain a certain brightness at the edge of the field of view.
  • the design of the curved shape of some microlenses is not good enough, and the resulting illuminance will show uneven fluctuations.
  • an object of the present invention is to provide a microlens array element, which is used to solve the problem that the curved appearance of part of the microlens is not good enough, and the resulting illuminance will show uneven fluctuations. .
  • the invention also provides a diffusion sheet.
  • the present invention further provides an electronic device.
  • the microlens array element includes: a substrate, one side surface of the substrate is provided with a microlens array composed of a plurality of microlenses, the microlenses are aspherical microlenses, and the aspherical microlenses
  • the curved surface of the lens away from the substrate is a circularly symmetric curved surface.
  • the microlens array thus arranged can meet the range of the field of view, and can ensure the uniformity of the illuminance within the field of view, and can maintain a certain brightness at the edge of the field of view, so as to ensure that the microlens array element is provided.
  • the projection of the microlens on the substrate is rectangular, the projection of the microlens on the substrate has a first side and a second side, and the first side
  • the size of the side is a
  • the size of the second side is b, where a and b satisfy the relationship: a>b.
  • the rectangular microlenses arranged in this way can have multiple arrangements, and it can be ensured that the light spot emitted by the microlens array under the effective parameter range is a rectangular light spot.
  • the ratio of the size of the second side to the size of the first side is s, where s satisfies the relationship: 0.65 ⁇ s ⁇ 0.85.
  • the microlens array element 100 arranged in this way can achieve the effect of accurately distributing light in the effective area.
  • the microlens array element is characterized in that 0.74 ⁇ s ⁇ 0.76.
  • 0.74 ⁇ s ⁇ 0.76 the rectangular spot closest to the size ratio of the second side and the first side can be obtained, that is, the illuminance distribution is more uniform.
  • the microlens array element is characterized in that a and b satisfy the relationship: 10 ⁇ m ⁇ b ⁇ a ⁇ 100 ⁇ m. This setting can make the illuminance evenly distributed.
  • the microlens has a central axis, the height of the central axis is d, the height of a line segment that intersects the central axis and the microlens is d, and d satisfies the relationship: 10 ⁇ m ⁇ d ⁇ 50 ⁇ m. This setting can effectively ensure the uniformity of the illuminance distribution.
  • all the microlenses in the microlens array, have the same extending direction of the first side and the same extending direction of the second side.
  • the micro lens array arranged in this way can achieve the effect of precise light distribution in the effective area.
  • the adjacent microlenses are arranged in sequence along a first direction, and are arranged staggered along a second direction, wherein the first direction is the first side
  • the extension direction of the second side or the extension direction of the second side, and the second direction is the extension direction of the second side or the extension direction of the first side corresponding to the first direction.
  • the micro lens array arranged in this way can also achieve the effect of precise light distribution in the effective area.
  • the curve formula of the curved surface is:
  • z is the vector height of the optical surface
  • c is the curvature at the apex of the aspheric surface
  • k is the coefficient of the aspheric surface
  • ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, ⁇ 6, ⁇ 7, ⁇ 8 are the coefficients of various orders
  • r is the point to micro
  • the distance coordinate of the optical axis of the lens; the parameters satisfy the relationship: ⁇ 1 0, ⁇ 2 >0, ⁇ 3 ⁇ 0, ⁇ 4 >0, ⁇ 5 ⁇ 0, ⁇ 6 >0, ⁇ 7 ⁇ 0, ⁇ 8 > 0, k ⁇ 0, r>0.
  • the microlens array arranged in this way can ensure uniform illumination distribution within the field of view.
  • the microlens array set in this way meets the curve formula of the curved surface with uniform illuminance distribution and high accuracy.
  • the diffusion sheet according to the embodiment of the present invention includes a microlens array element.
  • the beneficial effect of the diffuser is the same as that of the microlens array element, and the description will not be repeated here.
  • the electronic product according to the present invention includes the diffusion sheet.
  • the image quality of the electronic product set in this way is higher.
  • Fig. 1 is a first structural diagram of a microlens array element according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the structure of a micro lens according to an embodiment of the present invention.
  • Figure 3 is a cross-sectional view of a microlens array according to an embodiment of the present invention.
  • FIG. 4 is a second structural diagram of a microlens array element according to an embodiment of the present invention.
  • Fig. 5 is a partial enlarged view of area A in Fig. 4.
  • the microlens array element 100 the substrate 10; the microlens array 20; the microlens 30; the first side 31; the second side 32;
  • microlens array element 100 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5.
  • the microlens array element 100 includes a substrate 10, and a microlens array 20 composed of a plurality of microlenses 30 is provided on one side surface of the substrate 10.
  • the substrate 10 has a certain thickness.
  • a microlens array 20 composed of a plurality of microlenses 30 is provided on one side surface of the substrate 10.
  • the microlens array 20 not only has the basic functions of traditional lenses such as focusing and imaging, but also has the characteristics of small unit size and high integration.
  • the microlens array 20 refracts the light emitted by the light source into the corresponding effective area by using a closely arranged lens array.
  • the microlens 30 is an aspherical microlens 30, and the aspherical microlens 30 can maintain good aberration correction, and more effectively realize the miniaturization of products, and has been widely used in the fields of optical instruments and optoelectronics industries.
  • the curved surface of the aspheric microlens 30 away from the substrate 10 is a circularly symmetric curved surface.
  • the parameters of the microlens array 20 set in this way can meet the range of the field of view angle during the design, can ensure the uniformity of the illuminance in the field of view, and can maintain a certain brightness at the edge of the field of view, and can ensure the illuminance in the field of view.
  • the distribution is uniform, so that the imaging quality of the electronic device provided with the microlens array element 100 can be ensured.
  • the projection of the microlens 30 on the substrate 10 may be rectangular.
  • the projection of the microlens 30 on the substrate 10 has a first side 31 and a second side 32, the size of the first side 31 is a, and the size of the second side 32 is b, where a and b satisfy the relationship : A>b.
  • the shape of the microlens 30 can be easily controlled, and the microlens 30 can be arranged in a variety of arrangements on the substrate 10, so that the microlens array 20 can be formed.
  • the light diffused through the microlens array 20 can completely match the effective area, and the illuminance is evenly distributed.
  • the ratio of the size of the second side 32 to the size of the first side 31 is s, and within a certain range, the microlens array element 100 can achieve desired effects.
  • s satisfies the relationship: 0.65 ⁇ s ⁇ 0.85.
  • the microlens array element 100 arranged in this way can achieve the effect of accurately distributing light in the effective area, and the illuminance is evenly distributed.
  • the first side 31 and the second side 32 can be set within a certain range to achieve the desired effect.
  • a certain range for example: 0.74 ⁇ s ⁇ 0.76.
  • the upper end of the micro lens 30 is provided with a curved exit surface.
  • the preferred parameter range can be obtained by adjusting the shape of the exit surface of the microlens 30.
  • a and b may satisfy the relationship: 10 ⁇ m ⁇ b ⁇ a ⁇ 100 ⁇ m.
  • the microlens 30 has a central axis 33, the height of the line segment 33 intersecting the central axis with the microlens is d, and d satisfies the relationship: 10 ⁇ m ⁇ d ⁇ 50 ⁇ m.
  • d is the length of the connection line from the highest point of the exit surface of the microlens 30 to the center point of the bottom of the microlens 30.
  • the highest point of the line segment 33 is the vertex of the exit surface.
  • the shortest line from the highest point of the exit surface to any vertex of the lower end of the exit surface is a diagonal line, which is a curve, and is located on the same plane as the exit surface.
  • the first side 31, the second side 32 and the diagonal of the microlens 30 have the same curvature surface characteristics. .
  • the microlenses 30 sequentially arranged in the left-right direction are in a row, and the microlenses 30 sequentially arranged in the front-rear direction are in a row.
  • the projections of the adjacent second side edges 32 of the two adjacent microlenses 30 in each row on the substrate 10 can be completely overlapped, and the first side edges 31 on the same side of the multiple microlenses 30 in each row
  • the projection of the extension line on the substrate 10 is a straight line.
  • the projections of the adjacent first sides 31 of the two adjacent microlenses 30 in each column on the substrate 10 can be completely overlapped, and the projections of the second sides 32 on the same side of the multiple microlenses 30 in each column
  • the projection of the extension line on the substrate 10 is a straight line.
  • the multiple rows and multiple rows of microlenses 30 arranged in this way can form a microlens array 20.
  • the present invention is not limited to this, and the embodiment of the present invention may also have multiple arrangements of the microlens array
  • adjacent microlenses 30 are arranged in sequence along the first direction, and are arranged staggered along the second direction, wherein,
  • the first direction is the extension direction of the first side 31 or the extension direction of the second side 32
  • the second direction is the extension direction of the second side 32 or the extension direction of the first side corresponding to the first direction.
  • the first direction is the extending direction of the second side 32.
  • the second direction is the direction in which the first side 31 extends.
  • a plurality of microlenses 30 arranged in sequence in the first direction and staggered in the second direction form a microlens array 20.
  • the microlens array 20 arranged in this way can also achieve the effect of precise light distribution in the effective area.
  • curve formula of the curved surface can be:
  • z is the vector height of the optical surface
  • c is the curvature at the apex of the aspheric surface
  • k is the coefficient of the aspheric surface
  • ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, ⁇ 6, ⁇ 7, ⁇ 8 are the coefficients of various orders
  • r is the point to micro
  • the distance coordinate of the optical axis of the lens; the parameters satisfy the relationship: ⁇ 1 0, ⁇ 2 >0, ⁇ 3 ⁇ 0, ⁇ 4 >0, ⁇ 5 ⁇ 0, ⁇ 6 >0, ⁇ 7 ⁇ 0, ⁇ 8 > 0, k ⁇ 0, r>0.
  • the curve formula of the curved surface is the appearance description formula of the optical lens. In the example of the present invention, the appearance description formula can describe any aspheric curve.
  • the microlens array 20 arranged in this way can ensure uniform illuminance distribution in the field of view, thereby effectively improving the imaging quality of the electronic device.
  • the microlens array element 100 is characterized by: 3x10 4 ⁇ 2 ⁇ 5x10 4 , -9x10 7 ⁇ 3 ⁇ -4x10 7 , 5x10 10 ⁇ 4 ⁇ 1x10 11 , -7x10 13 ⁇ ⁇ 5 ⁇ -3x10 13 , 1x10 16 ⁇ 6 ⁇ 4x10 16 , -8x10 18 ⁇ 7 ⁇ -2x10 18 , 2x10 20 ⁇ 8 ⁇ 8x10 20 , -12 ⁇ k ⁇ -5, 0.005 ⁇ r ⁇ 0.03.
  • the lens array element 100 provided in this way has a high accuracy, which can satisfy the requirement of precise light distribution in the effective area.
  • the parameters of the microlens array element 100 have but are not limited to the characteristics shown in Table 1:
  • the microlens array element 100 manufactured according to the parameters in the above table can accurately distribute light in the effective area.
  • the diffusion sheet according to the embodiment of the present invention includes the microlens array element 100 according to the above-mentioned embodiment of the present invention.
  • the electronic device according to the present invention includes the diffusion sheet of the above-mentioned embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Solid State Image Pick-Up Elements (AREA)

Abstract

L'invention concerne un élément de réseau de microlentilles, un diffuseur et un dispositif électronique. L'élément de réseau de microlentilles comprend : un substrat, une surface latérale du substrat étant pourvue d'un réseau de microlentilles composé d'une pluralité de microlentilles, les microlentilles étant des microlentilles asphériques, et les surfaces incurvées des microlentilles asphériques faisant face au substrat étant des surfaces incurvées à symétrie circulaire. Ainsi, en définissant raisonnablement des paramètres des surfaces incurvées des microlentilles, la distribution d'éclairage des microlentilles peut être plus uniforme, ce qui garantit la qualité d'imagerie d'un élément électronique pourvu de l'élément de réseau de microlentilles.
PCT/CN2019/119882 2019-11-21 2019-11-21 Élément de réseau de microlentilles et diffuseur, et dispositif électronique WO2021097747A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2019/119882 WO2021097747A1 (fr) 2019-11-21 2019-11-21 Élément de réseau de microlentilles et diffuseur, et dispositif électronique

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Application Number Priority Date Filing Date Title
PCT/CN2019/119882 WO2021097747A1 (fr) 2019-11-21 2019-11-21 Élément de réseau de microlentilles et diffuseur, et dispositif électronique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090284686A1 (en) * 2008-05-16 2009-11-19 Hanbitt Joo Optical sheet, backlight unit, and liquid crystal display
CN102809867A (zh) * 2012-08-14 2012-12-05 深圳超多维光电子有限公司 一种立体显示装置
CN106461815A (zh) * 2014-05-27 2017-02-22 纳卢克斯株式会社 微透镜阵列及包括微透镜阵列的光学系统
CN107940403A (zh) * 2017-11-20 2018-04-20 维沃移动通信有限公司 一种灯罩及移动终端
CN108027521A (zh) * 2015-07-13 2018-05-11 韦夫弗朗特技术股份有限公司 光学产品、用于制作光学产品的母版、和用于制造母版和光学产品的方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090284686A1 (en) * 2008-05-16 2009-11-19 Hanbitt Joo Optical sheet, backlight unit, and liquid crystal display
CN102809867A (zh) * 2012-08-14 2012-12-05 深圳超多维光电子有限公司 一种立体显示装置
CN106461815A (zh) * 2014-05-27 2017-02-22 纳卢克斯株式会社 微透镜阵列及包括微透镜阵列的光学系统
CN108027521A (zh) * 2015-07-13 2018-05-11 韦夫弗朗特技术股份有限公司 光学产品、用于制作光学产品的母版、和用于制造母版和光学产品的方法
CN107940403A (zh) * 2017-11-20 2018-04-20 维沃移动通信有限公司 一种灯罩及移动终端

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