WO2022098201A1 - Feuille optique - Google Patents

Feuille optique Download PDF

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Publication number
WO2022098201A1
WO2022098201A1 PCT/KR2021/016208 KR2021016208W WO2022098201A1 WO 2022098201 A1 WO2022098201 A1 WO 2022098201A1 KR 2021016208 W KR2021016208 W KR 2021016208W WO 2022098201 A1 WO2022098201 A1 WO 2022098201A1
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WO
WIPO (PCT)
Prior art keywords
light
optical sheet
lenses
distance
micro
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PCT/KR2021/016208
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English (en)
Korean (ko)
Inventor
함문호
조장희
서지민
이종문
Original Assignee
주식회사 엘엠에스
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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Publication date
Priority claimed from KR1020210152006A external-priority patent/KR102678171B1/ko
Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Publication of WO2022098201A1 publication Critical patent/WO2022098201A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters

Definitions

  • Various embodiments of the present disclosure relate to an optical sheet, and more particularly, to an optical sheet for increasing fingerprint recognition efficiency of an electronic device including a fingerprint recognition sensor.
  • a security function necessary for executing mobile banking, an electronic wallet, etc. as well as a function of protecting personal information recently stored in the electronic device itself is provided in the electronic device, for example, a mobile communication terminal. It is mounted on portable electronic devices such as As the security function mounted in the electronic device, a password or a lock pattern according to a user setting, user authentication through a security application, etc. may be exemplified.
  • the authentication method using a password or a security application as a medium may have a low security level due to a high possibility of password leakage, or may have inconvenience in using a security application.
  • a biometric authentication method for example, a user authentication method using a fingerprint or iris recognition, secures a significant level of security, does not cause inconvenience in possession, and has a low risk of theft or imitation, thereby increasing ease of use. The number of cases where it is applied is increasing.
  • an optical fingerprint recognition sensor using light may be proposed.
  • the optical fingerprint recognition sensor using light irradiates light to the user's finger to detect an image corresponding to at least a portion of the user's fingerprint (eg, a ridge portion or a valley portion).
  • the optical fingerprint recognition sensor may be usefully used for managing access to a specific place, such as a door lock, and may be configured to be mounted on a miniaturized electronic device such as a mobile communication terminal.
  • An electronic device using an optical fingerprint recognition sensor performs fingerprint recognition based on light, and it is possible to recognize normal incident light in which light is perpendicular to the sensor, and photometry incident in a direction that is not perpendicular to the sensor is noise. There is a problem that works as In addition, an electronic device using an optical fingerprint recognition sensor mainly performs fingerprint recognition using light in a visible light band, but there is a problem in that light (eg, infrared light) other than visible light acts as noise.
  • light eg, infrared light
  • an optical sheet in which only light incident perpendicularly to the optical fingerprint recognition sensor is incident.
  • an optical sheet that transmits only light in a band having a high recognition rate for the fingerprint recognition sensor, including light other than visible light.
  • An optical sheet may include a light-transmitting substrate; a micro lens array formed on one surface of the light-transmitting substrate; It is possible to provide an optical sheet that includes at least one opening and a light absorption layer formed on the other surface of the light-transmitting substrate, and transmits only light having a wavelength of 600 nm or less.
  • the optical sheet according to various embodiments of the present disclosure When the optical sheet according to various embodiments of the present disclosure is used, only light that is perpendicularly incident to the sensor among the light reflected from the user's fingerprint can be recognized, so there is an advantage in that fingerprint recognition efficiency can be improved.
  • the optical sheet according to various embodiments of the present disclosure When the optical sheet according to various embodiments of the present disclosure is used, only light of a specific wavelength band among the light reflected from the user's fingerprint can be transmitted, so there is an advantage in that fingerprint recognition efficiency can be improved.
  • optical sheet according to various embodiments of the present disclosure it is possible to provide a numerical range for having high light efficiency in relation to the distance between the plurality of micro lenses using the micro lens array.
  • FIG. 1 is a diagram illustrating a state in which light reflected from a fingerprint is incident on an optical fingerprint recognition sensor, according to various embodiments of the present disclosure
  • FIG. 2 is a cross-sectional view illustrating an optical sheet according to various embodiments.
  • 3A is a view illustrating a micro lens array viewed from an optical sheet according to various embodiments of the present disclosure
  • 3B is a view illustrating a state in which a light absorbing layer is viewed from under an optical sheet, according to various embodiments of the present disclosure
  • FIG. 4A is a diagram illustrating a state in which a plurality of microlenses are spaced apart from each other in the embodiment of FIG. 1 .
  • 4B is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 20 ⁇ m.
  • 4C is a graph showing the amount of light for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 20 ⁇ m.
  • 5A is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 15 ⁇ m.
  • 5B is a graph showing the amount of light for each gap between the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 15 ⁇ m.
  • 6A is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 25 ⁇ m.
  • 6B is a graph showing the amount of light for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 25 ⁇ m.
  • 7A is a diagram illustrating a movement path of light perpendicularly incident to the microlens when the distance between the plurality of microlenses is 0 ⁇ m.
  • FIG. 7B is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the distance between the plurality of microlenses is 0 ⁇ m.
  • FIG. 7C is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the interval between the plurality of microlenses is 2 ⁇ m.
  • FIG. 7D is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the distance between the plurality of microlenses is 3 ⁇ m.
  • FIG 8 is a view illustrating an optical sheet including a light transmission limiting layer according to the first embodiment for limiting transmission of light in a specific wavelength band.
  • FIG. 9 is a view illustrating an optical sheet including a light transmission limiting material according to a second embodiment for limiting transmission of light in a specific wavelength band.
  • FIG. 10 is a view illustrating an optical sheet including a light transmission limiting material according to a third embodiment for limiting transmission of light in a specific wavelength band.
  • FIG. 11 is a diagram illustrating an optical sheet including a light transmission limiting material according to a fourth embodiment for limiting transmission of light in a specific frequency band.
  • each component (eg, module or program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. there is.
  • one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added.
  • a plurality of components eg, a module or a program
  • the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. .
  • operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other operations may be added.
  • FIG. 1 is a diagram illustrating a state in which light reflected from a fingerprint is incident on an optical fingerprint recognition sensor, according to various embodiments of the present disclosure
  • FIG. 1 may show a side cross-sectional view of a state in which light output from a light source (eg, LCD, LED, OLED, etc.) of an electronic device is refracted.
  • a light source eg, LCD, LED, OLED, etc.
  • the electronic device of the present invention may include any electronic device requiring a biometric fingerprint recognition function in addition to a mobile communication terminal (eg, a smartphone).
  • a mobile communication terminal eg, a smartphone
  • the electronic device may include a cover glass 100 , a display panel 200 , an optical sheet, and a fingerprint recognition sensor 400 .
  • the ridge is in close contact with the cover glass 100 .
  • a light source eg, LCD, LED, OLED, etc.
  • the cover glass 100 is not in close contact, so an air gap is generated, and after light passes through the air gap, it is incident on a partial region of the inclined valley portion 11 . Therefore, as a result, the degree of refraction of light incident on the trough portion 11 through the cover glass 100 may be relatively larger than that of the ridge portion 12 .
  • the direction of light may be refracted and reflected.
  • the reflected light a may be incident back into the electronic device including the cover glass 100 and may be received by the fingerprint recognition sensor 400 .
  • the width of the incident light amount may vary, and the Image information obtained from the fingerprint recognition sensor 400 based on the deviation of the width may be utilized as having different information. If the shape of the valleys and ridges of a user's finger prints is properly recognized, specific image information can be acquired by precisely detecting the deviation of the incident light width, and a specific user corresponding to the specific image information can be recognized. It can be used for user authentication.
  • the display panel 200 is a light-transmitting panel for light transmitted through the cover glass 100 to reach the fingerprint recognition sensor 400 .
  • the display panel 200 is an OLED (organic) panel including a plurality of pixels.
  • a Light Emitting Diode) panel or an OCTA (On Chip Touch AMOLED) panel including a touch sensor that can check whether a touch is made by measuring the pressure of an external object may be applicable.
  • the display panel 200 may further include a polarization layer (POL) and an adhesive layer (OCA).
  • the fingerprint recognition sensor 400 may be configured using a light receiving element such as a photodiode, or may be configured using a CCD or CMOS image sensor.
  • the optical sheet may be included as some components of an electronic device including a cover glass 100 , a polarization layer (not shown), a display panel 200 , and a fingerprint recognition sensor 400 .
  • the optical sheet the light-transmitting substrate 300; a micro lens array 310 formed on one surface of the light-transmitting substrate 300; and a light absorbing layer 320 including at least one opening 321 (or a pinhole) and formed on the other surface of the light transmitting substrate 300 .
  • the fingerprint recognition sensor 400 can recognize the normally incident light in which light is perpendicularly incident to the sensor, and the photometric incident in a direction that is not perpendicular to the sensor acts as noise. there is a problem.
  • the optical sheet may include a micro lens array 310 and a light absorption layer 320 .
  • the light-transmitting substrate 300 is a plate-shaped substrate, and may be a substrate having transparency.
  • a transparent glass substrate or a transparent resin substrate may be used as the light-transmitting substrate 300 .
  • a phosphate-based glass substrate strong against thermal deformation and warpage may be used as the transparent glass substrate.
  • the micro lens array 310 may be formed on a surface (hereinafter, referred to as 'top surface of the light-transmitting substrate 300 ') facing the fingerprint recognition sensor 400 on the light-transmitting substrate 300 .
  • the micro-lens array 310 may be implemented in a form protruding from the upper surface of the light-transmitting substrate 300 , and may be configured to include a plurality of micro lenses having a constant pitch and height.
  • the material of the micro lens array 310 polycarbonate (PC), polymethyl methacrylate (PMMA), polydimethyl siloxane (PDMS), UV curable resin, etc. may be used.
  • the micro lens array 310 may be manufactured by using various curing methods such as heating, UV application, drying, etc., on the liquid micro lens material.
  • the light absorption layer 320 may be formed on the surface of the light-transmitting substrate 300 facing the fingerprint recognition sensor 400 (hereinafter referred to as 'the lower surface of the light-transmitting substrate 300 ').
  • the light absorption layer 320 may include at least one opening 321 having a number and arrangement corresponding to the plurality of microlenses included in the microlens array 310 , and The light DL that is vertically incident on the fingerprint recognition sensor 400 can reach through the DL.
  • the photometric light SL reflected from the fingerprint and incident at a non-vertical angle is blocked by the light absorption layer 320 and does not reach the fingerprint sensor area 400 . Since only light that is vertically incident is incident on the fingerprint sensor region 400 , it is possible to prevent a decrease in the fingerprint recognition rate due to the light metering SL.
  • the light absorption layer 320 may include carbon black, a pigment, a dye, and a metal mixture.
  • the present invention is not necessarily limited thereto, and the light absorption layer 320 is a binder resin, for example, a cyclic olefin-based resin, a polyarylate resin, a polysulfone resin, an ethersulfone resin, a polyparaphenylene resin, and a polyarylene ether.
  • a binder resin for example, a cyclic olefin-based resin, a polyarylate resin, a polysulfone resin, an ethersulfone resin, a polyparaphenylene resin, and a polyarylene ether.
  • Phosphine oxide resin Phosphine oxide resin, polyimide resin, polyetherimide resin, polyamideimide resin, acrylic resin, polycarbonate resin, polyethylene naphthalate resin, organic-inorganic hybrid resin, etc.
  • the light absorption layer 320 may be formed of a cyclic olefin polymer (COP), a cyclic olefin co-polymer (COC), a polyimide resin (polyimide, PI), or a mixture thereof.
  • COP cyclic olefin polymer
  • COC cyclic olefin co-polymer
  • PI polyimide resin
  • 2 is a cross-sectional view illustrating an optical sheet according to various embodiments.
  • 3A is a view illustrating a micro lens array viewed from an optical sheet according to various embodiments of the present disclosure
  • 3B is a view illustrating a state in which a light absorbing layer is viewed from under an optical sheet, according to various embodiments of the present disclosure;
  • a spatial coordinate system including an X-axis, a Y-axis perpendicular to the X-axis, and a Z-axis perpendicular to the X-axis and the Y-axis, respectively, may be illustrated.
  • the X axis of the spatial coordinate system may correspond to the width direction of the optical sheet
  • the Y axis of the spatial coordinate system may correspond to the length direction of the optical sheet
  • the Z axis of the spatial coordinate system may correspond to the height direction of the optical sheet and can be matched.
  • each micro lens constituting the micro lens array 310 are the height of the light transmissive substrate, the refractive index of the micro lens array 310 and the light transmissive substrate 300 , the distance to the fingerprint recognition sensor, and the size of the fingerprint recognition sensor. Although it may be different depending on the resolution and pixel size, it may be generally formed to have a pitch of several tens of ⁇ m and a height of several ⁇ m.
  • the dimensions of the opening 321 of the light absorption layer 320 and the height of the light-transmitting substrate 300, the refractive index of the micro lens array 310 and the light-transmitting substrate 300, the distance to the fingerprint recognition sensor, the fingerprint may be different depending on the resolution and pixel size of the recognition sensor, but may be formed to have a diameter of several ⁇ m.
  • the micro lens array 310 when the refractive index of the micro lens array 310 is 1.55 and the refractive index of the light transmissive substrate 300 is 1.45, the micro lens array 310 has a pitch of 20 ⁇ m and 2.1 It has a height of ⁇ m, the height of the light-transmitting substrate 300 is formed to be 50 ⁇ m, and the opening 321 of the light absorption layer 320 may be formed to have a diameter of 2 ⁇ m to 7 ⁇ m, in which case the light reflected by the fingerprint The luminous efficiency of the vertical light incident on the fingerprint sensor is measured to be about 100%.
  • the micro lens array 310 disposed on the upper surface of the optical sheet has a regular hexagonal shape when the micro lens is viewed from above, or a shape close to a regular hexagon when the micro lens is viewed from above.
  • the branch may be formed in a hemispherical shape.
  • a plurality of openings 321 are formed in the light absorption layer 320 , and the plurality of openings 321 are formed at positions corresponding to the respective microlenses included in the microlens array 310 . can be
  • the micro lens array 310 disposed on the upper surface of the optical sheet may include a plurality of micro lenses, and the plurality of micro lenses may be formed to be spaced apart from each other by a predetermined interval 311 .
  • the distance between the plurality of micro lenses may be set to 20% or less of the micro lens pitch length.
  • FIG. 4A is a diagram illustrating a state in which a plurality of microlenses are spaced apart from each other in the embodiment of FIG. 1 .
  • 4B is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 20 ⁇ m.
  • 4C is a graph showing the amount of light for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 20 ⁇ m.
  • 5A is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 15 ⁇ m.
  • 5B is a graph showing the amount of light for each gap between the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 15 ⁇ m.
  • 6A is a table showing the amount of light and the light efficiency for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 25 ⁇ m.
  • 6B is a graph showing the amount of light for each gap of the plurality of micro lenses when the pitch of the plurality of micro lenses is formed to be 25 ⁇ m.
  • a plurality of micro lenses may be formed to be spaced apart from other adjacent micro lenses by a predetermined gap 311 .
  • the light absorption layer 320 may include a plurality of openings 321 formed at positions corresponding to the plurality of micro lenses.
  • FIG. 4A vertical light passing through only one micro lens and one opening 321 is shown, but the present invention is not limited thereto. can each pass.
  • the light transmissive substrate 300 may have a height of 50 ⁇ m, and the light absorption layer 320 may have a height of 10 ⁇ m.
  • the diameter of the opening 321 of the light absorption layer 320 may be 2 ⁇ m to 7 ⁇ m.
  • FIGS. 4B, 5A and 6A show various examples of the focal center light amount (kW/mm 2 ) and the light efficiency (%).
  • the amount of light at the center of focus was measured using a light quantity meter, and light efficiency (or light transmittance) was measured using a spectrophotometer.
  • the distance 311 between the microlenses may be formed to be flat according to an embodiment, but is not necessarily limited thereto, and may collectively refer to a portion having a different curvature from the curvature R of the microlens. should be noted.
  • the present applicant has a height of 50 ⁇ m of the light transmissive substrate 300 and a height of 10 of the light absorption layer 320 ⁇ m and the diameter of the opening 321 of the light absorbing layer 320 is 2 ⁇ m to 7 ⁇ m as a basic condition, the distance between a plurality of micro lenses, that is, the optical characteristics for the condition in which the pitch (pitch) is variously set experiment is carried out and the results are shown in FIGS. 4B and 4C, 5A and 5B, and 6A and 6B.
  • the height of the light transmissive substrate 300 is 50 ⁇ m
  • the height of the light absorption layer 320 is 10 ⁇ m
  • the diameter of the opening 321 of the light absorption layer 320 is 2 ⁇ m to 7 ⁇ m
  • a plurality of micro Under the basic condition that the pitch of the lenses is 20 ⁇ m, when the distance 311 between the lenses is 0 ⁇ m, the focal center light quantity is 228.15 kW/mm 2 , and the light efficiency is measured to be 100%.
  • the focal center light quantity is 226.80 kW/mm 2 , and the light efficiency is measured to be 99%.
  • the distance 311 between the lenses is 2 ⁇ m
  • the focal center light amount is 223.42 kW/mm 2
  • the light efficiency is measured to be 98%.
  • the distance 311 between the lenses is formed to be 0 to 2 ⁇ m, it is measured as an approximate value of 100% light efficiency considering the tolerance (maximum 5%).
  • the focal center light amount is 201.08 kW/mm 2 , and the light efficiency is measured to be 88%.
  • the focal center light quantity is 173.89 kW/mm 2 , and the light efficiency is measured to be 76%.
  • the focal center light quantity is 114.45 kW/mm 2 , and the light efficiency is measured to be 50%.
  • FIG. 4C graphs of the amount of light from the focal center compared to the focal area are shown when the distances 311 between the lenses are 0 ⁇ m, 1 ⁇ m, 2 ⁇ m, 3 ⁇ m, 4 ⁇ m, and 5 ⁇ m, respectively.
  • the amount of light at the focal center is not large, but when the distance 311 between the lenses exceeds 3 ⁇ m, the measured light amount drops sharply ( It can be seen that the amount of light at the focal point falls below 205.335 kW or the light efficiency drops below 90%), and the light incident on the distance 311 between the lenses of the vertical light is transmitted and the degree of absorption and extinction in the light absorption layer increases. there is.
  • sidelight which is scattered light other than vertical light
  • the distance between lenses exceeds 10% of the RAMS pitch length, light passes through an undesigned aperture, that is, an adjacent aperture, thereby increasing the visibility of noise.
  • the height of the light transmissive substrate 300 is 50 ⁇ m
  • the height of the light absorption layer 320 is 10 ⁇ m
  • the diameter of the opening 321 of the light absorption layer 320 is 2 ⁇ m to 7 ⁇ m
  • a plurality of microlenses are formed.
  • the pitch is 15 ⁇ m
  • the focal center light quantity is 228.15 kW/mm 2
  • the light efficiency is measured to be 100%.
  • the focal center light quantity is 223.59 kW/mm 2
  • the light efficiency is measured to be 98%.
  • the focal center light amount is 221.30 kW/mm 2 , and the light efficiency is measured to be 97%.
  • the distance 311 between the lenses is formed in a range of 0 to 1.5 ⁇ m, it is measured as an approximate value of 100% light efficiency considering a tolerance (maximum 5%).
  • the focal center light amount is 205.33 kW/mm 2 , and the light efficiency is measured to be 90%.
  • the focal center light amount is 164.27 kW/mm 2 , and the light efficiency is measured to be 72%.
  • the focal center light quantity is 95.82 kW/mm 2 , and the light efficiency is measured to be 42%.
  • FIG. 5B graphs of the focal center light quantity compared to the focal area are shown when the distances 311 between the lenses are 0 ⁇ m, 1 ⁇ m, 1.5 ⁇ m, 2 ⁇ m, 3 ⁇ m, and 5 ⁇ m, respectively.
  • the focal center light amount does not have a large deviation, but when the distance 311 between the lenses exceeds 2 ⁇ m, the measured light amount drops sharply ( It can be seen that the amount of light at the center of focus drops below 205.335 kW or the light efficiency drops below 90%).
  • the height of the light transmissive substrate 300 is 50 ⁇ m
  • the height of the light absorption layer 320 is 10 ⁇ m
  • the diameter of the opening 321 of the light absorption layer 320 is 2 ⁇ m to 7 ⁇ m
  • a plurality of microlenses are formed.
  • the pitch is 25 ⁇ m
  • the focal center light amount is 228.15 kW/mm 2
  • the light efficiency is measured to be 100%.
  • the focal center light quantity is 227.01 kW/mm 2
  • the light efficiency is measured to be 100%.
  • the distance 311 between the lenses is 2.5 ⁇ m
  • the focal center light amount is 223.59 kW/mm 2
  • the light efficiency is measured to be 98%.
  • the distance 311 between the lenses is formed in a range of 0 to 2.5 ⁇ m, it is measured as an approximate value of 100% light efficiency considering a tolerance (maximum 5%).
  • the focal center light amount is 207.62 kW/mm 2 , and the light efficiency is measured to be 91%.
  • the focal center light amount is 180.24 kW/mm 2 , and the light efficiency is measured to be 79%.
  • the distance 311 between the lenses is 6.5 ⁇ m, the focal center light quantity is 141.45 kW/mm 2 , and the light efficiency is measured to be 62%.
  • FIG. 6B graphs of the amount of light from the focal center compared to the focal area are shown when the distances 311 between the lenses are 0 ⁇ m, 1 ⁇ m, 2.5 ⁇ m, 3.5 ⁇ m, 5 ⁇ m, and 6.5 ⁇ m, respectively.
  • the amount of light from the focal center is not large, but when the distance 311 between the lenses exceeds 3.5 ⁇ m, the measured light amount drops sharply ( It can be seen that the amount of light at the center of focus falls below 207.62 kW or the light efficiency drops below 91%).
  • FIGS. 4B to 6B it can be seen that when the spacing between the plurality of microlenses exceeds a specific critical range, the focal center light quantity and light efficiency are rapidly reduced.
  • FIGS. 7A to 7D is a diagram illustrating a movement path of light perpendicularly incident to the microlens when the distance between the plurality of microlenses is 0 ⁇ m.
  • FIG. 7A is a diagram illustrating a movement path of light perpendicularly incident to the microlens when the distance between the plurality of microlenses is 0 ⁇ m.
  • FIG. 7B is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the distance between the plurality of microlenses is 0 ⁇ m.
  • FIG. 7C is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the interval between the plurality of microlenses is 2 ⁇ m.
  • FIG. 7D is a diagram illustrating a movement path of light incident on the side light SL having an inclination angle with respect to the microlens when the distance between the plurality of microlenses is 3 ⁇ m.
  • the height of the light transmissive substrate 300 is 50 ⁇ m
  • the height of the light absorption layer 320 is 10 ⁇ m
  • the diameter of the opening 321 of the light absorption layer 320 is 2 ⁇ m to 7 ⁇ m
  • a plurality of micro lenses When the pitch of is 20 ⁇ m, it is possible to represent the optical characteristics when the spacing of the plurality of microlenses is different.
  • FIG. 7A similarly to the embodiment shown in FIG. 4A , may show a state in which vertical light is incident on the microlens (or the image sensor 400 of FIG. 1 ). However, FIG. 7A may represent a movement path of light when the distance between the microlenses is 0 ⁇ m (or close to 0 ⁇ m). Referring to FIG. 7A , when the distance between the microlenses is 0 ⁇ m, some of the light passing through the microlens 310 and the transparent substrate 300 is absorbed by the light absorption layer 320 , and the other portion is with the microlens It may pass through the opening 321 disposed at the corresponding position (the opening located in the traveling direction of the normal light).
  • FIG. 7B may also represent the movement path of light when the distance between the microlenses is 0 ⁇ m (or close to 0 ⁇ m). However, unlike FIG. 7A , FIG. 7B may show a state in which an inclination angle is incident with respect to the microlens (or the image sensor 400 of FIG. 1 ). For example, 45 degrees may be applied as the inclination angle mentioned in various embodiments of the present disclosure, but it should be noted that the inclination angle is not limited to any specific value. Referring to FIG.
  • the photometry passing through the microlens 310 and the transparent substrate 300 is not an opening disposed at a position corresponding to the microlens, but other You can proceed towards the opening.
  • the photometric light passing through the micro lens 310 and the transparent substrate 300 may be absorbed by the light absorption layer 320 .
  • FIG. 7C illustrates a state in which an inclination angle is incident to the microlenses in a state where a gap of 2 ⁇ m is formed between the microlenses.
  • photometric light passing through the microlens 310 and the transparent substrate 300 may be absorbed by the light absorption layer 320 .
  • FIG. 7D may show a state in which an inclination angle is incident with respect to the microlenses in a state in which a gap of 3 ⁇ m is formed between the microlenses.
  • the gap between the microlenses is 3 ⁇ m
  • some of the photometric light passing through the microlens 310 and the transparent substrate 300 is absorbed by the light absorption layer 320 , and the other portion is It can be confirmed that the microlens passes through an adjacent other opening instead of the opening disposed at a position corresponding to that of the microlens.
  • a gap therebetween is set to 10% or less of the length of the microlens pitch, and various embodiments of the present invention provide an optical sheet including a plurality of microlenses under such conditions.
  • the optical sheet according to various embodiments of the present invention may be an optical sheet that transmits only light of 600 nm or less. It is also possible to provide an optical sheet.
  • the light transmission limiting layer may have, for example, a blocking function for light of a specific band or higher.
  • a blocking function for light of a specific band or higher For example, visible light and infrared light in a wavelength band of 600 nm or more performs fingerprint recognition using light in the visible light band. It is possible to improve the sensing efficiency of the recognition sensor. Accordingly, according to an embodiment of the present invention, it is possible to provide an optical sheet further comprising a light transmission limiting layer for restricting transmission of light of 600 nm or more.
  • the light transmission limiting layer may be implemented in various forms according to embodiments. For example, it may be implemented in the form of a separate layer distinguished from other components among the components of the optical sheet, or may be implemented by being applied and/or deposited on the surface of at least any one of the components of the optical sheet, Alternatively, it may be implemented as one-body with any one of the components of the optical sheet.
  • FIG 8 is a view illustrating an optical sheet including a light transmission limiting layer according to the first embodiment for limiting transmission of light in a specific frequency band.
  • the light transmission limiting layer 330 may be formed between the upper surface of the light transmitting substrate 300 and the micro lens array 310 .
  • the light transmission limiting layer 330 may be formed of a compound (including at least one of a dye, a binder, and nanoparticles) having an absorption maxima of visible light and infrared light (eg, near-infrared light of 750 nm to 3 ⁇ m or less) in a wavelength range of 600 nm or more.
  • the light transmission limiting layer 330 can be used to absorb light in a specific band (eg, visible light and infrared light in a wavelength range of 600 nm or more) incident to the light transmitting substrate 300 , the light in the band acting as noise is a fingerprint It is possible to block the incident to the recognition sensor 400 .
  • a specific band eg, visible light and infrared light in a wavelength range of 600 nm or more
  • the light transmission limiting material constituting the light transmission limiting layer may be at least one compound selected from the group consisting of squarylium, phthalocyanine, croconium, and cyanine-based compounds. .
  • FIG. 9 is a view illustrating an optical sheet including a light transmission limiting material according to a second embodiment for limiting transmission of light in a specific frequency band.
  • the light transmission limiting layer may be formed on the surface of the micro lens array 310 .
  • the light transmission limiting layer may be integrally formed together during the formation of the micro lens array 310 . That is, the micro lens array 310 may be formed to include a light transmission limiting material.
  • a compound having a maximum absorption of visible light and infrared in a wavelength range of 600 nm or more is sprayed and coated on the surface of a micro lens, or a compound having a maximum absorption of visible light and infrared absorption in a wavelength range of 600 nm or more is a material of a micro lens. It can also be formed by mixing polycarbonate (PC), polymethyl methacrylate (PMMA), polydimethyl siloxane (PDMS), and UV curable resin.
  • PC polycarbonate
  • PMMA polymethyl methacrylate
  • PDMS polydimethyl siloxane
  • FIG. 10 is a view illustrating an optical sheet including a light transmission limiting material according to a third embodiment for limiting transmission of light in a specific frequency band.
  • a light transmission limiting material is included in the light transmissive substrate 300 .
  • a compound including at least one of a dye, a binder, and nanoparticles
  • a maximum absorption of visible light and infrared light in a wavelength range of 600 nm or more is added to the light-transmitting substrate 300 . It can be formed by mixing with materials (eg, glass, resin).
  • FIG. 11 is a diagram illustrating an optical sheet including a light transmission limiting material according to a fourth embodiment for limiting transmission of light in a specific frequency band.
  • the light transmission limiting layer 330 may be disposed under the light absorption layer 320 .
  • the light transmission limiting layer 330 is, for example, spaced apart from the light transmitting substrate 300 by a predetermined distance to form a separate layered structure, and an adhesive layer 340 (eg, optically clear (OCA)) on at least one surface.
  • adhesive eg, optically clear (OCA)
  • OCA optically clear resin
  • PSA pressure sensitive adhesive
  • the light transmission limiting layer 330 is on the back surface of the light transmitting substrate 300 in order to selectively limit the wavelength of light that has passed through the micro lens array 310, the light transmitting substrate 300, and the light absorption layer 320 in sequence. It may have a configuration provided, and may be laminated with the light-transmitting substrate 300 via the adhesive layer 340 .
  • the light transmission limiting layer 330 may be formed of a compound (including at least one of a dye, a binder, and nanoparticles) having an absorption maxima of visible light and infrared light (eg, near-infrared light of 750 nm to 3 ⁇ m or less) in a wavelength range of 600 nm or more. can
  • the applicant's repeated experimental results may have a transmittance of 76.4% with respect to light of 400 to 600 nm, and to light of 600 to 800 nm. It was confirmed that it can have a transmittance of 7.7% for the
  • a light-transmitting substrate in the optical sheet, a light-transmitting substrate; a micro lens array formed on one surface of the light-transmitting substrate; It is possible to provide an optical sheet that includes at least one opening and a light absorption layer formed on the other surface of the light-transmitting substrate, and transmits only light in a frequency band of 600 nm or less.
  • the micro lens array may include a plurality of micro lenses spaced apart from each other by a predetermined distance.
  • the distance between the micro lenses may be set to 20% or less of the micro lens pitch length.
  • the light absorber may include at least one of carbon black, a pigment, a dye, and a metal mixture.
  • a light transmission limiting layer may be further included.
  • the light transmission limiting layer may be formed between the upper surface of the light transmitting substrate and the micro lens array.
  • the light transmission limiting layer may be formed on a surface of the micro lens array.
  • the micro lens array may include a light transmission limiting material.
  • the light-transmitting substrate may include a light-transmitting material.
  • the light transmission limiting layer may be disposed on a rear surface of the light absorption layer.
  • optical film of the various embodiments of the present disclosure described above and the backlight unit including the same are not limited by the above-described embodiments and drawings, and various substitutions, modifications and changes are possible within the technical scope of the present disclosure. It will be apparent to those of ordinary skill in the art to which this belongs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

Divers modes de réalisation de la présente divulgation se rapportent à une feuille optique pour la reconnaissance d'empreinte digitale. La feuille optique selon divers modes de réalisation de la présente divulgation comprend : un substrat transmettant la lumière ; un réseau de microlentilles formé sur une surface du substrat transmettant la lumière ; une couche d'absorption de lumière comprenant au moins une ouverture et formée sur l'autre surface du substrat transmettant la lumière. En conséquence, il est possible de fournir une feuille optique qui ne transmet qu'une lumière d'une bande de fréquence de 600 nm ou moins. Selon divers modes de réalisation, il est également possible de fournir une feuille optique.
PCT/KR2021/016208 2020-11-09 2021-11-09 Feuille optique WO2022098201A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20200148714 2020-11-09
KR10-2020-0148714 2020-11-09
KR1020210152006A KR102678171B1 (ko) 2020-11-09 2021-11-08 광학 시트
KR10-2021-0152006 2021-11-08

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WO2022098201A1 true WO2022098201A1 (fr) 2022-05-12

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101042257B1 (ko) * 2007-12-05 2011-06-17 한국전자통신연구원 하이브리드 마이크로 렌즈 어레이 및 그 제조 방법
KR20190019339A (ko) * 2017-08-17 2019-02-27 주식회사 하이딥 지문인식센서가 결합된 디스플레이 장치
US20200293741A1 (en) * 2019-02-02 2020-09-17 Shenzhen GOODIX Technology Co., Ltd. Fingerprint identification apparatus and electronic device
KR20200109375A (ko) * 2018-12-13 2020-09-22 선전 구딕스 테크놀로지 컴퍼니, 리미티드 지문 식별 장치 및 전자 기기
US20200327296A1 (en) * 2019-04-10 2020-10-15 Shenzhen GOODIX Technology Co., Ltd. Optical fingerprint identification apparatus and electronic device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101042257B1 (ko) * 2007-12-05 2011-06-17 한국전자통신연구원 하이브리드 마이크로 렌즈 어레이 및 그 제조 방법
KR20190019339A (ko) * 2017-08-17 2019-02-27 주식회사 하이딥 지문인식센서가 결합된 디스플레이 장치
KR20200109375A (ko) * 2018-12-13 2020-09-22 선전 구딕스 테크놀로지 컴퍼니, 리미티드 지문 식별 장치 및 전자 기기
US20200293741A1 (en) * 2019-02-02 2020-09-17 Shenzhen GOODIX Technology Co., Ltd. Fingerprint identification apparatus and electronic device
US20200327296A1 (en) * 2019-04-10 2020-10-15 Shenzhen GOODIX Technology Co., Ltd. Optical fingerprint identification apparatus and electronic device

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