WO2019210572A1 - Module de reconnaissance d'empreintes digitales utilisé sous un écran - Google Patents

Module de reconnaissance d'empreintes digitales utilisé sous un écran Download PDF

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Publication number
WO2019210572A1
WO2019210572A1 PCT/CN2018/094732 CN2018094732W WO2019210572A1 WO 2019210572 A1 WO2019210572 A1 WO 2019210572A1 CN 2018094732 W CN2018094732 W CN 2018094732W WO 2019210572 A1 WO2019210572 A1 WO 2019210572A1
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WO
WIPO (PCT)
Prior art keywords
light
fingerprint recognition
recognition module
screen
guiding member
Prior art date
Application number
PCT/CN2018/094732
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English (en)
Chinese (zh)
Inventor
郎欢标
Original Assignee
东莞市美光达光学科技有限公司
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Application filed by 东莞市美光达光学科技有限公司 filed Critical 东莞市美光达光学科技有限公司
Publication of WO2019210572A1 publication Critical patent/WO2019210572A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the invention relates to a fingerprint identification module, and more particularly to a fingerprint recognition module for a mobile phone, a tablet, a notebook computer, an electronic lock, and an identification device.
  • U.S. Patent Application Serial No. US 957 0002 discloses a touch screen fingerprint recognition technology using micro LED sensing technology, as shown in Fig. 36, which is equipped with a tiny infrared emitter and sensor on a miniature LED display.
  • the array replaces the current mainstream capacitive fingerprint sensor assembly.
  • This design integrates the touch panel and fingerprint sensor. Its advantages are: it is very beautiful and practical, hidden under the display screen, very hidden and difficult to be detected, integrated with the display, it is mainly used for the next-generation smartphone's borderless screen design, "disappeared" HOME button and Touch ID fingerprint sensor. However, this technology can only be used on the display screen of OLED.
  • OLED organic light-emitting LED
  • the display does not need backlight illumination, so the area of fingerprint recognition imaging does not need backlight opening.
  • OLED organic light-emitting LED
  • the light guide plate of the backlight module for the illumination display the bottom surface has a slight structure
  • the light guide plate is in the fingerprint recognition optical imaging mode.
  • the position directly above the group requires a hole to allow the light from the lower surface of the fingerprint to pass through the backlight module and be imaged by the imaging lens below. Then, because the position of the opening of the light guide plate cannot illuminate the LCD screen directly above, an obvious black dot appears on the display screen.
  • the above invention adopts a touch screen display technology of micro LED sensing technology, and the biggest technical problem of the OLED screen is that the life of the organic material is limited. Since blue-emitting OLED materials degrade faster than other color materials, the blue output will be less than other colors. In addition, water can instantly damage the organic material of the display, so the improved sealing process is of great significance to actual production. OLED screens consume a lot of power when displaying images with a white background (such as documents or websites). Another disadvantage is the burn-in problem: the aging speed of each position is different due to the difference in the display of each pixel on the screen. The production of such panels is very difficult and expensive.
  • the present invention provides a fingerprint recognition module for use under the screen of a mobile phone as an example, which has low cost, high life, and good reliability, and can simultaneously eliminate the light guide plate.
  • the black dots on the display caused by the opening can be used for ordinary LCD touch displays.
  • the present invention provides a fingerprint recognition module for use under a screen, comprising a screen member, a miniature backlight illumination system mounted under the screen member, and an imaging system mounted inside the miniature backlight illumination system, the screen
  • the component comprises a glass cover plate, a display screen disposed under the glass cover plate, a light guide plate disposed under the display screen for illuminating the display screen, a light guiding area disposed in the middle of the light guide plate, the light guide plate being disposed at the light guide
  • the miniature backlight illumination system includes a light guiding member for adjusting light and a light emitting member for generating light, the light guiding member including a reflective structure and a top field of the light guiding member for limiting an imaging system field of view
  • the corner of the light-emitting member is disposed at the bottom of the light-guiding member or at the bottom of the light-guiding member and integrally formed with the light-guiding member, and the reflective structure is a reflective surface inclined from the inner upper side to the outer lower side,
  • the imaging comprises
  • the filter is a narrow band filter that transmits infrared light in a wavelength band of 760 nm to 1040 nm, and may also be an infrared filter for filtering infrared light.
  • the imaging system further includes a light diaphragm mounted above the imaging lens, the light diaphragm is provided with a first through hole, and the light diaphragm is independently disposed above the imaging lens, which may also be disposed on Above the imaging lens and integrated with the imaging system.
  • the reflective structure comprises an annular sawtooth microstructure for light distribution, and the annular sawtooth microstructure is preferably a total reflection microstructure or a total reflection microstructure and a semi-reflection microstructure combination.
  • the light guiding member comprises a collecting lens for collecting and collimating light emitted from the light emitting member, and an outer side surface for totally reflecting the light.
  • the light guiding member further comprises a transmissive stepped surface which is disposed at an intermediate bottom of the light guiding member and is inclined from the inner upper side to the outer lower side for transmitting the light reflected by the outer side surface to the reflective structure.
  • the condensing lens is disposed at the bottom of the outer ring of the light guiding member, and the illuminating member is disposed under the condensing lens.
  • the outer side is totally reflected by the light collimated by the collecting lens.
  • the concentrating lens is disposed below an outer side surface of the outer ring of the light guiding member, the illuminating member is disposed at a side of the condensing lens, and the light guiding member further comprises a pair of condensed lenses The collimated light illuminates the inner side of the total reflection, and the outer side is subjected to secondary total reflection of the light reflected by the inner side.
  • the concentrating lens is disposed under the inner side surface of the outer ring of the light guiding member, and the outer side surface includes a first outer side surface for totally reflecting the light collimated by the condensing lens.
  • the second outer side surface is secondarily totally reflected by the light reflected by the first outer side surface.
  • the concentrating lens is disposed below an outer side surface of the outer ring of the light guiding member, and the light guiding member further includes an inner side surface for totally reflecting the light collimated by the condensing lens.
  • the outer side faces the second total total reflection of the light reflected by the inner side surface
  • the light guiding member further includes a light emitting surface mounted on the top of the light guiding member, wherein the light emitting surface is a sawtooth Fresnel surface, and the light guiding light
  • the member further includes a reflective step surface disposed at the bottom of the light guiding member inclined from the inner upper side to the outer lower portion for totally reflecting the light reflected by the outer side surface to the light emitting surface.
  • the bottom of the light guiding member is provided with a transmissive stepped surface for transmitting light reflected by the outer side surface to the reflective structure, which is inclined from the inner upper side to the outer lower side, and is disposed below the transmissive step surface.
  • a high-reflection component which is disposed independently of the light-guiding member, and can also be integrally formed with the light-guiding member.
  • the high light reflecting component comprises a microstructure for mixing light, the number of the imaging lenses being one piece, which may also be set to two or more pieces.
  • the imaging lens is an optical imaging lens
  • the optical imaging lens is an aspherical optical lens, a diffractive optical curved lens or a Fresnel curved lens.
  • the light-emitting member is a plurality of LED light sources, which may also be provided as a plurality of laser light sources, a plurality of white LED light sources and an IR LED infrared light source combination or a plurality of white LED light sources and a color LED light source combination.
  • the surface of the reflective structure is provided with a phosphor member for exciting white light
  • the light emitting member is at least two blue laser diodes or blue LED light sources
  • the wavelength of the blue LED or blue LED light source is between 380 nm and 450 nm. between.
  • the light guiding member is circular, which may also be elliptical, square, triangular, polygonal or irregular.
  • the display screen is an LCD liquid crystal display, which may also be an OLED display or a micro LED array display.
  • the light guiding area is a light guiding through hole formed on the light guide plate, and may also be a transparent plane or a curved surface disposed on the light guide plate.
  • the light guiding member further includes a light introducing surface provided on an outer ring thereof, and the light emitting member is disposed outside the light guiding member.
  • the invention comprises a miniature backlight illumination system and an imaging system installed in the miniature backlight illumination system, a screen member mounted on the micro backlight illumination system, the screen member comprising a glass cover plate and a display screen disposed under the glass cover plate.
  • a light guide plate for illuminating the liquid crystal display panel disposed under the display screen the light guide plate is provided with a light guiding region disposed therebetween, the light guide plate is disposed above the light guiding member
  • the miniature backlighting system includes a light guiding member and In a light-emitting member that emits illumination light
  • the imaging system includes an imaging lens for imaging, and an image sensor mounted under the imaging lens for receiving an image.
  • the invention has the advantages of simple structure, low cost, high life, and good reliability, and at the same time can eliminate black spots on the display screen caused by the opening of the light guide plate, and can be used for a common LCD touch display screen.
  • FIG. 1 is a schematic structural diagram of a fingerprint recognition module for playing with a screen member under the screen according to Embodiment 1 of the present invention
  • Figure 2 is an enlarged view of a portion A of Figure 1;
  • FIG. 3 is an exploded view of an isometric view of a fingerprint recognition module for use at the bottom of the screen according to Embodiment 1 of the present invention
  • FIG. 4 is an isometric view of a light guiding member for a fingerprint recognition module under the screen according to Embodiment 1 of the present invention
  • Figure 5 is a bottom view of Figure 4.
  • FIG. 6 is an isometric view of a reflective structure for a fingerprint recognition module under the screen provided by Embodiment 1 of the present invention.
  • Figure 7 is a bottom view of Figure 6;
  • FIG. 8 is a schematic diagram of a light distribution method for a reflective structure of a fingerprint recognition module under the screen according to Embodiment 1 of the present invention.
  • FIG. 9 is a schematic diagram of a light distribution of a N-th micro-tilted reflection surface of a reflective surface of a reflective structure for a fingerprint recognition module under the screen according to Embodiment 1 of the present invention.
  • FIG. 10 is a schematic diagram showing an angle between a reflection structure and an optical axis of a fingerprint recognition module for a screen under the screen according to Embodiment 1 of the present invention.
  • FIG. 11 is a computer simulation diagram of a miniature backlight illumination system for a fingerprint recognition module under the screen according to Embodiment 1 of the present invention.
  • FIG. 12 is a supplementary illumination result diagram of a miniature backlight illumination system for a fingerprint recognition module under the screen provided by the first embodiment of the present invention
  • FIG. 13 is an isometric view of an imaging lens for a fingerprint recognition module under the screen according to Embodiment 1 of the present invention.
  • Figure 14 is a bottom view of Figure 10
  • FIG. 15 is a light path diagram of an imaging system for a fingerprint recognition module under the screen according to Embodiment 1 of the present invention.
  • FIG. 16 is a schematic structural diagram of a fingerprint recognition module for playing under the screen and a screen member according to Embodiment 2 of the present invention.
  • FIG. 17 is a schematic structural diagram of a fingerprint recognition module for playing under the screen and a screen member according to Embodiment 3 of the present invention.
  • FIG. 18 is a schematic structural diagram of a fingerprint recognition module for playing with a screen member under the screen according to Embodiment 4 of the present invention.
  • FIG. 19 is a schematic structural diagram of a fingerprint recognition module for use in the lower part of a screen and a screen component according to Embodiment 5 of the present invention.
  • FIG. 20 is a schematic structural diagram of a fingerprint recognition module for playing under the screen and a screen member according to Embodiment 6 of the present invention.
  • 21 is an exploded view of an isometric view of a fingerprint recognition module for use at the bottom of the screen according to Embodiment 6 of the present invention.
  • FIG. 22 is an isometric view of a light guiding member for a fingerprint recognition module under the screen according to Embodiment 6 of the present invention.
  • Figure 23 is a bottom view of Figure 18;
  • FIG. 24 is a schematic diagram of a light distribution method of a miniature backlight illumination system for a fingerprint recognition module under the screen according to Embodiment 6 of the present invention.
  • FIG. 25 is a schematic structural diagram of a fingerprint recognition module for playing with a screen member under the screen provided by Embodiment 7 of the present invention.
  • FIG. 26 is a schematic structural diagram of a fingerprint recognition module for playing under the screen and a screen member according to Embodiment 8 of the present invention.
  • Figure 27 is an enlarged view of a portion B of Figure 25;
  • FIG. 29 is a schematic structural diagram of a light guiding member and a light emitting member for a fingerprint recognition module under the screen provided by Embodiment 9 of the present invention.
  • FIG. 30 is a schematic structural diagram of a fingerprint recognition module for playing under the screen and a screen member according to Embodiment 10 of the present invention.
  • FIG. 31 is a schematic diagram of a plurality of light sources and a light guiding member for a fingerprint recognition module under the screen provided by Embodiment 11 of the present invention.
  • FIG. 32 is a schematic diagram of a seven-sided light guiding member used in a fingerprint recognition module at the bottom of the screen and a light source according to Embodiment 12 of the present invention
  • FIG. 33 is a schematic structural diagram of a fingerprint recognition module for playing with a screen member under the screen according to Embodiment 13 of the present invention.
  • FIG. 34 is a schematic structural diagram of a fingerprint recognition module for a lower part of a screen provided by a fourteenth embodiment of the present invention, in which a plurality of small fingerprint recognition modules are spliced and matched with a screen member;
  • FIG. 35 is a schematic diagram of an imaging range of a fingerprint identification module for a screen below, which is assembled by a plurality of small fingerprint recognition modules according to Embodiment 14 of the present invention.
  • Figure 36 is a block diagram showing the structure of a touch screen fingerprint recognition technology using micro LED sensing technology disclosed in U.S. Patent Application Serial No. US 957 0002.
  • Embodiments of the present invention provide a fingerprint recognition module for use under the screen.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system installed under the screen member, and a miniature backlight illumination device.
  • An imaging system inside the system, the screen member includes a glass cover plate 110, a display screen 120 disposed under the glass cover plate 110, and a light guide plate 130 disposed under the display screen 120 for illuminating the display screen 120, the light guide plate A light guiding area 131 is disposed in the middle of the 130.
  • the micro backlighting system includes a light guiding member 140 for adjusting light and a light emitting member 190 for generating light.
  • the light guiding member 140 includes a reflecting structure 150 for emitting light.
  • the condensing lens 141 for collecting and collimating the light emitted from the member 140, the outer side surface 142 for totally reflecting the light, and the outer bottom portion of the light guiding member 140 are inclined from the inner upper side to the outer bottom portion for being externally
  • the side reflected light is transmitted to the transmissive step surface 143 on the reflective structure and the bell mouth 144 disposed on the top of the light guiding member 140 for limiting the viewing angle of the imaging system, the reflective structure 1 50 is disposed at the bottom of the transmissive step surface 143.
  • the reflective structure 150 is a reflective surface inclined from the inner upper side to the outer lower side.
  • the reflective structure 150 includes a reflective surface 151 disposed under the transmissive step surface 143.
  • the imaging system is disposed under the bell mouth 144.
  • the imaging system includes an imaging lens 160 for imaging, a filter 170 disposed under the imaging lens 160, and an image sensor for receiving an image disposed under the filter 170. 180.
  • the condensing lens 141 is disposed at the bottom of the outer ring of the light guiding member 140.
  • the illuminating member 190 is disposed under the condensing lens 141.
  • the outer surface 142 totally reflects the light collimated by the collecting lens 141. After the totally reflected light is incident on the reflective structure 150 through the transmissive step surface 143 for reflection, the light uniformly illuminates the range of 5 mm in diameter of the LCD display panel 120 and the position of the fingerprint epidermis on the upper surface 111 of the cover glass 110.
  • the transmissive stepped surface comprises an annular serrated microstructure, each small segment of the microstructure consisting of a small vertical transmission plane perpendicular to the direction of incident light and a small horizontal plane parallel to the incident light, which allows incident light to pass through. And incident on the reflecting surface 151 located outside the reflective structure 150 below it for reflection and light distribution.
  • each of the rays incident on the reflecting surface of the reflecting structure is reflected by the angle ⁇ N of the optical axis Z 1 Z 2 , and the size thereof is gradually changed, that is, each small segment of the reflecting surface has a microstructure.
  • the inclined reflecting surface has a gradient of the inclination angle.
  • the backlight systems on the left and right sides have a symmetrical structure, and the light emitted from the position 0 of the light-emitting member 190 is collimated by the arc-shaped collecting lens 141 under the outer ring of the light guiding member, and then guided by the light guiding member.
  • the outer reflecting surface 142 reflects, and the reflected light is transferred 90° in the horizontal direction in the middle direction, and then transmitted through the transmissive annular transmissive step surface 143 and then incident on the reflecting surface 151 on the outer side of the lower reflecting structure 150.
  • the reflecting surface 151 is divided into L annular zigzag micro-inclined reflecting surfaces, and the micro-inclined reflecting surface is composed of a small inclined reflecting surface and a small horizontal plane parallel to the incident light, and the light guiding member thereof 140 incident light is reflected and distributed.
  • the light distribution characteristic is as follows: assuming that any one of the rays AB N is incident on the Nth micro-inclined reflecting surface of the reflecting surface 151, and the reflected light is B N C N , then the reflected light is sandwiched by the optical axis Z 1 Z 2
  • the angle ⁇ N is a gradual relationship. From the lowest segment of the reflecting surface 151 to the uppermost segment, the light distribution angle is gradually changed from the minimum light distribution angle ⁇ min to the maximum light distribution angle ⁇ max .
  • Preferred embodiments of the present embodiment changes the light distribution angle is between 0 ° ⁇ 35 °, i.e., incident on the reflecting surface 151 at the bottom of a light reflecting surface inclined miniature B 1 point, which is reflected light B 1 C 1, the reflected light
  • the light distribution angle of B 1 C 1 is the smallest, and the angle with the optical axis Z 1 Z 2 is ⁇ min .
  • the angle ⁇ min is preferably 0°.
  • the light incident on the uppermost portion of the inclined reflecting surface BL at the uppermost side of the reflecting surface 151 has a reflected light of B L C L , and the reflected light B L C L has the largest angle with the optical axis Z 1 Z 2 .
  • the light distribution angle is ⁇ max , and in this embodiment, the maximum light distribution angle ⁇ max is preferably 35°.
  • the light distribution angle ⁇ N is gradually changed from the minimum light distribution angle ⁇ min to the maximum light distribution angle ⁇ max , and the specific angular range of the light distribution is not limited, and the light distribution angle can be adjusted according to the spot uniformity of the position of the upper surface 111 of the glass cover.
  • the light distribution angle ⁇ N can be increased to a range of -15° to 60°, or reduced to a range of 5° to 30°.
  • any one of the rays AB N is incident on the Nth micro-inclined reflecting surface of the reflecting surface 151, and the reflected light is B N C N , and B N Q is the tangent of the micro-inclined reflecting surface, B N N
  • B N H is a horizontal line
  • B N Z is a vertical line.
  • the inclination angle of the Nth micro-tilted reflecting surface and the horizontal line B N H can be obtained:
  • the light distribution angle is changed from the minimum light distribution angle ⁇ min to the maximum light distribution angle ⁇ max .
  • the specific embodiment preferably has a linearly varying relationship. Assuming that the reflecting surface 151 is divided into N micro-inclined reflecting surfaces, the N-th micro-inclined reflecting surface has a light distribution angle of:
  • the inclination angle (the angle between the horizontal line) of the Nth micro-inclined reflecting surface of the reflecting surface 151 is obtained as follows:
  • the minimum light distribution angle ⁇ min of the shortest position of the sawtooth microstructured tapered reflecting surface 151 is 0°, and the maximum light distribution angle ⁇ max of the shortest position of the uppermost position is 35°.
  • the reflection surface 151 gradually decreases in the inclination angle ⁇ of the micro-tilted reflection surface from the bottom to the top, and is gradually changed between 10° and 75°.
  • angles of the micro-tilted reflecting surfaces are arranged in a sequence from small to large gradual, and in other embodiments, they may also be arranged in a partially staggered arrangement.
  • the angle of the inclined base surface 151b to which the reflecting surface 151 is attached is the tip of the first micro-inclined reflecting surface on the inner side and the last micro-inclined reflecting surface on the lower side of the outer side.
  • the connection between the two points of the tooth tip is generated, and the angle between the two points of the optical axis Z 1 Z 2 is ⁇ , the angle is an oblique angle, and the inclination angle is between 15° and 80° degrees.
  • This embodiment preferably prefers the tilt.
  • the angle is 70.36°.
  • the circular light guiding member 140 of the total reflection prism structure is reflected by the outer side surface 142 and emits light in the middle direction, which is horizontal, vertical or a certain angle with the horizontal direction, and may also have A narrow angle of divergence or concentrated light.
  • the plurality of micro-tilted reflecting surfaces are connected by oblique straight lines, which may also be connected by horizontal straight lines or curved lines.
  • the inclined base surface 151b to which the reflecting surface 151 is attached in this embodiment is disposed as an inclined plane, which may also be provided as a curved surface with a curvature.
  • the bell mouth 144 is an aperture stop of the imaging lens 160, and the aperture stop allows imaging light of the fingerprint lower surface to be imaged through the imaging lens 160 into the image sensor 180 below it, and blocks light outside the angle of view from entering In the imaging lens 160.
  • the filter 170 is used to filter out infrared rays, such as heat radiation of a finger, and only allows light having a wavelength between 380 nm and 760 nm to pass through the filter 170 and be imaged into the image sensor 180.
  • the illuminating member 190 is a plurality of LED light sources for uniformly illuminating the upper LCD display screen and the lower finger skin.
  • three white light patch LED light sources are preferably used, and the four white light patch LED light sources are used.
  • the distance is placed below the collecting lens 141.
  • the number can also be set to two, three, four or any number according to actual needs.
  • the light guiding member 140 is preferably circular.
  • the results show the uniformity and illuminance distribution of the spot in the range of 5 mm in diameter on a computer-simulated LCD display.
  • the simulation results show that the illuminance uniformity of the LCD display in the range of 5 mm in diameter is about 80%. It can meet the black spots on the LCD display screen caused by the opening of the light guide plate 130 by the supplementary illumination, and fully integrates with the backlight illumination effect at other positions on the LCD display screen.
  • the imaging lens 160 includes upper and lower aspheric surfaces that image a range of approximately 5 mm of the upper surface 111 of the cover glass 110 onto the image sensor 180 below.
  • the image sensor 180 in this embodiment is preferably a CMOS sensor.
  • the display screen 120 is an LCD liquid crystal display. In other embodiments, it may also be an OLED display or a micro LED array display.
  • the light guiding area 131 in this embodiment is a light guiding through hole formed in the light guide plate. In other embodiments, it may also be a transparent plane or a curved surface disposed on the light guiding plate.
  • the light-emitting member 190 in this embodiment is horizontally disposed, and in other embodiments, it may be disposed vertically or at an angle.
  • the reflective structure 250 in this embodiment is a total reflection structure. In other embodiments, it may also be a partial total reflection structure and a partial semi-reflective structure combination.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system installed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the component includes a glass cover 210.
  • the cover glass 210 includes an upper surface 211 for placing a finger, a display 220 disposed under the cover glass 210, and a light guide 230 for illuminating the display 220 disposed under the display 220.
  • a light guiding region 231 is disposed in the middle of the light guiding plate 230.
  • the miniature backlighting system includes a light guiding member 240 for adjusting light and a light emitting member 290 for generating light.
  • the light guiding member 240 includes a reflective structure.
  • the reflecting structure 250 is disposed independently at the bottom of the transmissive step surface 243, and the reflecting structure 250 is from the inside to the top.
  • the reflective structure 250 includes a reflective surface 251 disposed below the transmissive stepped surface 243, the imaging system being disposed below the bell mouth 244, the imaging system including an imaging lens 260 for imaging,
  • the filter 270 disposed under the imaging lens 260 is mounted on the image sensor 280 for receiving an image under the filter 270.
  • the difference between the second embodiment and the first embodiment is that the condensing lens 241 is disposed under the outer side surface 242 of the outer ring of the light guiding member 240, and the light emitting member 290 is disposed on the side of the collecting lens 241.
  • the light member 240 further includes an inner side surface that totally reflects the light, and totally reflects the light collimated by the collecting lens 241, and the outer side surface 242 re-reflects the light totally reflected by the inner side surface, and after the second reflection
  • the light is incident on the reflective structure 250 through the transmissive step surface 243 for reflection as in the first embodiment.
  • the path after the light, the imaging process, and other settings are the same as those in the first embodiment, and will not be described herein.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the member includes a glass cover 310.
  • the cover glass 310 includes an upper surface 311 for placing a finger, a display screen 320 disposed under the glass cover 310, and a light guide plate 330 for illuminating the display screen 320 disposed under the display screen 320.
  • a light guiding area 331 is disposed in the middle of the light guiding plate 330.
  • the miniature backlighting system includes a light guiding member 340 for adjusting light and a light emitting member 390 for generating light.
  • the light guiding member 340 includes a reflective structure 350.
  • a collecting lens 341 for collecting and collimating light emitted from the light emitting member 390, an outer side surface for totally reflecting light, and a tilting from the inner upper side to the outer lower side of the middle bottom portion of the light guiding member 340
  • Transmissive step surface 343 for transmitting light reflected by the outer side surface 342 to the reflective structure and for limiting the angle of view of the imaging system at the top of the light guiding member 340 a bell mouth 344, the outer side surface including a first outer side surface for totally reflecting light collimated by the collecting lens 341 and a second reflecting surface for reflecting light reflected by the first outer side surface
  • the two outer side surfaces 342, the reflective structure 350 is disposed independently at the bottom of the transmissive step surface 343, the reflective structure 350 is a reflective surface inclined from the inner upper to the outer lower, and the reflective structure 350 is disposed on the transmissive step
  • the imaging system is disposed below the bell 344.
  • the difference between the third embodiment and the first embodiment is that the condensing lens 341 is disposed under the inner side surface 342 of the outer ring of the light guiding member 340, and the light emitting member 390 is disposed at the side of the collecting lens 341.
  • the outer side surface includes a first outer side surface for totally reflecting the light collimated by the collecting lens 341 and a second outer side surface 342 for second reflecting the light reflected by the first outer side surface, The light after the secondary reflection is incident on the reflective structure 350 through the transmissive step surface 343 for reflection.
  • the path after the light, the imaging process, and other settings are the same as those in the first embodiment, and will not be described herein. .
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the member includes a glass cover 410 that includes an upper surface 411 for placing a finger, a display screen 420 disposed under the glass cover 410, and a light guide plate 430 disposed below the display screen 420 for illuminating the display screen 420.
  • a light guiding area 431 is disposed in the middle of the light guiding plate 430.
  • the miniature backlighting system includes a light guiding member 440 for adjusting light and a light emitting member 490 for generating light, and the light guiding member 440 is included for A collecting lens 441 for collecting and collimating light emitted from the light emitting member 490, and an inner side surface 445 for totally reflecting the light collimated by the collecting lens 441 for performing light reflected by the inner side surface 445
  • the sub total reflection outer side surface 442 is disposed opposite to the bottom of the light guiding member 440 from the inner upper side to the outer lower side for reflecting the light twice reflected by the outer side surface 442
  • the structure 443 is provided on the top of the light guiding member 440 for illuminating the light reflected by the reflecting structure 443, and a light-emitting surface 444 disposed at the top of the light guiding member 440 for limiting the viewing angle of the imaging system.
  • the imaging system is disposed under the bell mouth, the imaging system includes an imaging lens 460 for imaging, a light diaphragm mounted above the imaging lens, and a filter 470 mounted under the imaging lens 460.
  • An image sensor 480 for receiving an image disposed under the filter 470, the diaphragm is provided with a first through hole, and the bell mouth communicates with the first through hole of the diaphragm to become an aperture light of the imaging lens 460.
  • the difference between the fourth embodiment and the second embodiment is that the condensing lens 441 is disposed under the outer side surface 442 of the outer ring of the light guiding member 440, and the light emitting member 490 is disposed on the side of the collecting lens 441.
  • a light-emitting surface 444 for secondary light distribution is disposed on the top of the light member 440.
  • the light-emitting surface 444 is a sawtooth Fresnel surface, and the light-emitting surface 444 is a total-reflective microstructure, and each sawtooth has a different tilt angle.
  • the inclined surface uniformly distributes the incident light and is evenly distributed to the upper surface 411 of the cover glass of the touch screen.
  • the light guiding member 440 further includes an inner side surface 445 for totally reflecting the light collimated by the collecting lens 441, and the outer side surface 442 is secondarily reflected by the light reflected by the inner side surface 445.
  • the light is incident on the reflective structure 443 for reflection. After that, the reflected light is the same as that in the second embodiment.
  • the other paths except the light passing through the light exit surface 444, the imaging process, and other settings are the same as those in the first embodiment, and are not described herein again. .
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the component includes a glass cover 1010.
  • the cover glass 1010 includes an upper surface 1011 for placing a finger, a display screen 1020 disposed under the glass cover 1010, and a light guide plate 1030 for illuminating the display screen 1020 disposed under the display screen 1020.
  • a light guiding region 1031 is disposed in the middle of the light guiding plate 1030.
  • the micro backlighting system includes a light guiding member 1040 for adjusting light and a light emitting member 1060 for generating light.
  • the light guiding member 1040 includes The condensing lens 1044 that collects and collimates the light emitted by the illuminating member 1060, and the inner side surface 1043 for totally reflecting the light collimated by the condensing lens 1044 is used to perform the light reflected by the inner side surface 1043.
  • the sub-total reflection outer side surface 1045 is disposed at the inner side of the light guiding member 1040 at the bottom position and is inclined from the inner upper side to the outer side for the second side of the outer side surface 1045.
  • An imaging system is disposed below the bell mouth 1050, the imaging system includes an imaging lens 1070 for imaging, and a light diaphragm mounted above the imaging lens 1070, mounted on the imaging system.
  • the filter 1080 under the lens 1070 is mounted on the image sensor 1090 for receiving an image under the filter 1080.
  • the aperture is provided with a first through hole, and the first pass of the bell mouth 1050 and the diaphragm The holes communicate to become the aperture stop of the imaging lens 1070.
  • the reflective structure 1042 is a total reflection and partial reflection combination, which is a ring-shaped reflective curved surface extending from the inner side to the outer side, and the cross-sectional contour of the ring-shaped reflective curved surface is different from multiple segments.
  • the angle is a straight line or a curve, and the reflective structure 1042 reflects the light that is totally reflected by the outer surface 1045 to the light-emitting surface 1041.
  • the filter 1080 is a narrow-band filter for transmitting infrared light in the 760 nm to 1040 nm band.
  • the narrow-band filter can prevent other optical signals from entering the image sensor 1090 to avoid interference.
  • other light reflections and matching are performed. The light, imaging process, and other settings are the same as in the fourth embodiment and will not be described again here.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system installed under the screen member, and an imaging system installed inside the miniature backlight illumination system.
  • the screen member includes a glass cover 510, a display screen 520 disposed under the glass cover 510, and a light guide plate 530 disposed under the display screen 520 for illuminating the display screen 520.
  • the light guide plate 530 is provided with a light guide.
  • the micro backlight illumination system includes a light guiding member 540 for adjusting light, and a light emitting member 590 for generating light, the light emitting member 590 being disposed on the outer side 540 of the light guiding member, the light guiding member 540
  • the reflective structure 542 is a reflective surface inclined from the inner upper side to the outer lower side, the reflective surface is installed at the bottom of the light guiding member 540, and the imaging system is disposed under the bell mouth 544
  • the imaging system includes an imaging lens 560 for imaging, a diaphragm 550 disposed above the imaging lens 560, and a filter 570 disposed under the imaging lens 560, and is disposed under the filter 570 for An image sensor 580 that receives an image, the aperture sheet 530
  • the difference between the sixth embodiment and the first embodiment is that the light guiding member 540 includes a light introducing surface 541 located on the outer circumference of the light guiding member 540, and the light emitted from the light emitting member 590 is incident from the light introducing surface 541 to the reflecting structure 542, after the light
  • the path, imaging process, and other settings are the same as in the first embodiment, and are not described herein again.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the member includes a glass cover 610.
  • the cover glass 610 includes an upper surface 611 for placing a finger, a display screen 620 disposed under the glass cover 610, and a light guide plate 630 for illuminating the display screen 620 disposed under the display screen 620.
  • a light guiding region 631 is disposed in the middle of the light guiding plate 630.
  • the micro backlighting system includes a light guiding member 640 for adjusting light and a light emitting member 690 for generating light
  • the light guiding member 640 includes a light introducing surface. 641, a reflecting structure 642 for reflecting light incident from the light introducing surface 641 and a bell mouth disposed at the top of the light guiding member 640 for limiting the angle of view of the imaging system
  • the reflecting structure 642 is from the inside to the top a downwardly inclined reflecting surface
  • the reflecting surface is disposed at the bottom of the light guiding member 640
  • the imaging system is disposed under the bell mouth
  • the imaging system includes
  • the imaging lens 660 is mounted on the imaging lens 660
  • the optical filter 650 is disposed under the imaging lens 660
  • the image sensor 680 is disposed under the filter 670 for receiving images.
  • the diaphragm 650 is provided with a first through hole, and the bell mouth communicates with the first through hole of the diaphragm 650 to become an aperture stop of the imaging lens
  • the difference between the seventh embodiment and the sixth embodiment is that a high-reflection component 6100 is disposed under the reflective structure 642, and a small air is left between the tapered inclined reflective surface 642 at the middle portion of the upper light guiding member 640. Gap.
  • the high-reflection component 6100 is configured to recover the light leaking from the reflective surface 642 and reflect it to the upper LCD display screen.
  • the remaining light paths, imaging processes, and other settings are the same as in the sixth embodiment, and are not described herein again. .
  • the high-reflection group 6100 may be a separate component, or the high-reflection component 6100 may be molded together with the upper light-guiding member 640 by a two-shot (two-color injection molding) molding method.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system installed under the screen member, and an imaging system installed inside the miniature backlight illumination system.
  • the screen member includes a glass cover 710.
  • the cover glass 710 includes an upper surface 711 for placing a finger, a display screen 720 disposed under the glass cover 710, and a display screen 720 disposed below the display screen 720 for illuminating the display screen 720.
  • a light guide plate 730 is disposed in the middle of the light guide plate 730 with a light guiding region 731.
  • the miniature backlight illumination system includes a light guiding member 740 for adjusting light and a light emitting member 790 for generating light.
  • the light guiding member 740 includes a light introducing surface 741, a reflecting structure 742 for reflecting light incident from the light introducing surface 741, and a bell mouth disposed at the top of the light guiding member 740 for limiting the angle of view of the imaging system, the reflecting structure 742 being a slave a reflecting surface inclined from the inner upper side to the outer lower side, the reflecting surface is disposed at the bottom of the light guiding member 740, the imaging system is disposed under the bell mouth, and the imaging system package
  • the reflective structure 742 is provided with a transmissive step surface 742, and the high reflection component 7100 disposed under the step surface is a variety of microstructures with a light mixing function.
  • Each step of the stepped surface 742 of the light guiding member 740 is constituted by a vertical plane which is almost perpendicular to the direction of the incident light, and a horizontal plane which is almost parallel to the direction of the incident light.
  • the light emitted by the light-emitting member 790 passes through the vertical surface of the stepped surface 742 and is incident on the high-reflection component 7100 below it.
  • the remaining light paths, imaging processes, and other settings are the same as in the seventh embodiment, and will not be described herein.
  • the high-reflection component 7100 is disposed on an inclined surface adjacent to the light-guiding member 740 with a micro-mirror array, and the micro-mirror array is a concave or convex reflecting surface having a size of several tens of micrometers. Its main function is to diffuse the reflected light over a range of angles to form a uniform light distribution of the fingerprint epidermis.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the member includes a glass cover 810 including an upper surface 811 for placing a finger, a display screen 820 disposed under the glass cover 810, and a light guide plate 830 disposed below the display screen 820 for illuminating the display screen 820.
  • a light guiding region 831 is disposed in the middle of the light guiding plate 830.
  • the micro backlighting system includes a light guiding member 840 for adjusting light and a light emitting member 890 for generating light.
  • the light guiding member 840 includes a light introducing surface.
  • the imaging lens 860 is mounted on the imaging lens 860, the optical filter 850 is disposed under the imaging lens 860, and the image sensor 880 is disposed under the filter 870 for receiving images.
  • the diaphragm 850 is provided with a first through hole, and the bell mouth 843 communicates with the first through hole of the diaphragm 850 to become an aperture stop of the imaging lens 860.
  • the imaging lens 860 is an optical imaging lens
  • the optical imaging lens is preferably a Fresnel curved lens, which may also be an aspherical optical lens, a diffractive optical curved lens, and the implementation.
  • a piece of Fresnel curved lens is preferred.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the member includes a glass cover 910.
  • the cover glass 910 includes an upper surface 911 for placing a finger, a display screen 920 disposed under the glass cover 910, and a light guide plate 930 disposed below the display screen 920 for illuminating the display screen 920.
  • a light guiding region 931 is disposed in the middle of the light guiding plate 930.
  • the micro backlighting system includes a light guiding member 940 for adjusting light and a light emitting member 990 for generating light
  • the light guiding member 940 includes a light introducing surface. 941, a reflection structure 942 for reflecting light incident from the light introduction surface 941 and a bell mouth for limiting an angle of view of the imaging system disposed at the top of the light guide member 940, the reflection structure 942 is from the inside to the top a lower inclined reflecting surface, the reflecting surface is disposed at the bottom of the light guiding member 940, the imaging system is disposed under the bell mouth 943, and the imaging system includes An imaging lens for imaging, a diaphragm 950 disposed above the imaging lens 960, a filter 970 disposed under the imaging lens, and an image sensor 980 disposed under the filter 970 for receiving an image.
  • the imaging lens includes a first imaging lens 961 and a second imaging lens 962 disposed under the first imaging lens 961.
  • the diaphragm 950 is provided with a first through hole, and the first opening of the bell 943 and the aperture 950 The through holes communicate to become the aperture stop of the imaging lens 960.
  • the imaging lens can be set to two according to the size of the field of view and the length of the conjugate distance.
  • the imaging lens includes the first imaging lens 961 and is mounted on The second imaging lens 962 under the first imaging lens 961 has a plurality of degrees of freedom for correcting aberrations, has a wide imaging range, better imaging resolution, and can be set according to actual conditions. More than two pieces.
  • the remaining light paths, imaging processes, and other settings are the same as in the eighth embodiment and will not be described again here.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member.
  • the light-emitting member is composed of three white-light patch LED light sources 1191 and The three IR LED light sources 1192 are arranged at equal intervals on the side of the light guiding member 1140.
  • the white light patch LED light source 1191 lights up, the IR LED light source 1192 is turned off; when the fingerprint characteristic information is read, IR The LED light source 1192 lights up, and the white light patch LED light source 1191 is turned off, so that the image sensor can read the infrared characteristic information of the fingerprint to improve the resolution of the fingerprint feature.
  • the remaining light paths, imaging processes, and other settings are the same as in the eighth embodiment and will not be described again here.
  • the light-emitting member may be a combination of a plurality of white LED light sources and IR LED light sources, a plurality of white LED light sources and color LED light sources, or a plurality of laser light sources, in addition to the single white LED light source.
  • the difference between the embodiment 12 and the sixth embodiment is that the shape of the light guiding member 1240 is a heptagon, and the four white LED light sources constituting the light emitting member 1290 are equidistantly mounted on the light guiding member.
  • the sides of the 1240 to form a uniform light.
  • the remaining light paths, imaging processes, and other settings are the same as in the sixth embodiment and will not be described again here.
  • the light guiding member 1240 can also be set to three deformations, a quadrangle, a pentagon, a hexagon or other polygons as required.
  • the present invention provides a fingerprint recognition module for a screen, including a screen member, a miniature backlight illumination system disposed under the screen member, and an imaging system installed inside the miniature backlight illumination system, the screen
  • the component includes a glass cover 1310, the glass cover 1310 includes an upper surface 1311 for placing a finger, a display screen 1320 disposed under the glass cover 1310, and a light guide plate 1330 for illuminating the display screen 1320 disposed under the display screen 1320.
  • a light guiding area 1331 is disposed in the middle of the light guiding plate 1330.
  • the micro backlighting system includes a light guiding member 1340 for adjusting light and a light emitting member 1390 for generating light.
  • the light guiding member 1340 includes a light introducing surface. a reflection structure 1342 for reflecting light incident from the light introduction surface 1341 and a bell mouth for limiting an angle of view of the imaging system disposed on the top of the light guide member 1340, the reflection structure 1342 being from the inside to the top a reflective surface that is inclined at an outer lower surface, the reflective surface is disposed at a bottom of the light guiding member 1340, and the imaging system is disposed under the bell mouth 1343,
  • the imaging system includes an imaging lens for imaging, a diaphragm 1350 mounted above the imaging lens 1360, a filter 1370 mounted under the imaging lens 1360, and an image for receiving an image mounted under the filter 1370.
  • the sensor 1380, the diaphragm 1350 is provided with a first through hole, and the bell mouth 1343 communicates with the first through hole of the diaphragm 1350 to become an aperture stop of the imaging lens 1360.
  • the difference between the thirteenth embodiment and the sixth embodiment is that the light-emitting member 1390 is two blue laser diodes, and the reflective structure 1342 is provided with a layer of phosphor coated with white light to uniformly illuminate the excited white light.
  • a fingerprint skin located on the upper surface 1311 of the cover glass 1310 that images the gully texture of the fingerprint skin below the lens.
  • the laser of the blue laser diode has a wavelength between 380 nm and 450 nm.
  • the light emitting member 1390 may also be a blue LED light source having a wavelength between 380 nm and 450 nm.
  • the present invention provides a fingerprint identification module for the lower part of the screen.
  • the difference between the thirteenth embodiment and the first embodiment to the thirteenth embodiment is as follows:
  • the fingerprint identification module and the plurality of small fingerprint identification modules form a larger fingerprint recognition module by splicing to obtain higher resolution and discrimination speed.
  • Multiple small fingerprint recognition modules can be spliced into quadrilateral, hexagonal, octagonal or other polygons, or other shapes.
  • the small fingerprint recognition module comprises a miniature backlight illumination system and an imaging system installed in the miniature backlight illumination system, and a screen member mounted on the micro backlight illumination system, the screen member comprising a glass cover 1610 disposed on the glass cover
  • a display screen 1620 below the board 1610 is disposed under the display screen 1620 for illuminating the display panel 1620.
  • the light guide board 1630 is provided with a light guiding area therebetween, and the micro backlighting system includes light for adjusting light.
  • the light guiding member 1640 disposed under the light guide plate 1630 is disposed on the side of the light guiding member 1640 for emitting light
  • the imaging system includes an imaging lens 1260 for imaging, which is mounted on the imaging lens 1660.
  • the upper diaphragm, the filter 1670 disposed under the imaging lens 1660, is mounted on the image sensor 1680 for receiving an image under the filter 1670, and the aperture is opened with a first through hole, the guide
  • the light member includes a bell mouth for restricting an angle of view of the imaging lens, which is opened at a top intermediate position, and is formed on a reflecting surface below the light guiding member.
  • each of the small fingerprint recognition modules is imaged by the lower map sensor 1680, and image processing is required to cut out the image outside the hexagon.
  • the imaging of a plurality of small fingerprint recognition modules cut into hexagons can be combined to form a complete image of a large area. Finally, the complete pattern of the stitched finished Hu is identified.
  • the large-scale fingerprint identification module may be formed by splicing any of the fingerprint identification modules provided in the first embodiment to the twelfth embodiment.
  • the present invention has a simple structure, low cost, high life, and good reliability, and at the same time can eliminate black spots on the display screen caused by the opening of the light guide plate, and can be used for a common LCD touch display screen.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un module de reconnaissance d'empreintes digitales utilisé sous un écran comprenant un composant d'écran, un système d'éclairage de rétroéclairage miniature installé sous le composant d'écran et un système d'imagerie installé à l'intérieur du système d'éclairage de rétroéclairage miniature ; le composant d'écran est installé sous le système d'éclairage de rétroéclairage miniature et le composant d'écran comprend une plaque de couverture en verre (110), un écran d'affichage (120) disposé sous la plaque de couverture en verre et une plaque de guidage de lumière (130) disposée sous l'écran d'affichage (120) et utilisée pour éclairer un écran d'affichage à cristaux liquides ; la plaque de guidage de lumière (130) est disposée sur un composant de guidage de lumière (140), et le système d'éclairage de rétroéclairage miniature comprend le composant de guidage de lumière (140) et un composant électroluminescent (190) installé sur une surface latérale du composant de guidage de lumière (140) ; le système d'imagerie comprend une lentille d'imagerie (160) utilisée pour l'imagerie et un capteur d'image (180) installé sous la lentille d'imagerie (160) et utilisé pour recevoir une image. La structure est simple, les coûts sont faibles, la durée de vie est longue et la fiabilité est bonne, le module pouvant éliminer des points noirs provoqués par une luminosité locale sur un écran d'affichage insuffisant en raison d'une ouverture d'une plaque de guidage de lumière et pouvant être utilisé pour des écrans d'affichage tactile LCD ordinaires.
PCT/CN2018/094732 2018-05-03 2018-07-06 Module de reconnaissance d'empreintes digitales utilisé sous un écran WO2019210572A1 (fr)

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CN201810425183.XA CN108446677A (zh) 2018-05-03 2018-05-03 一种用于屏幕下方的指纹识别模组

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