WO2021146956A1 - Appareil optique de détection d'empreintes digitales, écran tactile et dispositif électronique - Google Patents

Appareil optique de détection d'empreintes digitales, écran tactile et dispositif électronique Download PDF

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Publication number
WO2021146956A1
WO2021146956A1 PCT/CN2020/073631 CN2020073631W WO2021146956A1 WO 2021146956 A1 WO2021146956 A1 WO 2021146956A1 CN 2020073631 W CN2020073631 W CN 2020073631W WO 2021146956 A1 WO2021146956 A1 WO 2021146956A1
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WIPO (PCT)
Prior art keywords
light
fingerprint
glass cover
light source
display screen
Prior art date
Application number
PCT/CN2020/073631
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English (en)
Chinese (zh)
Inventor
池文明
王磊
张玮
王炳文
Original Assignee
深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2020/073631 priority Critical patent/WO2021146956A1/fr
Priority to CN202080001593.7A priority patent/CN112334909A/zh
Publication of WO2021146956A1 publication Critical patent/WO2021146956A1/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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G06V40/1365—Matching; Classification
    • 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
    • G06V40/1341—Sensing with light passing through the finger

Definitions

  • This application relates to the field of fingerprint identification technology, and in particular to an optical fingerprint detection device, touch screen and electronic equipment.
  • the embodiments of the present application provide an optical fingerprint detection device, a touch screen, and an electronic device, which can improve the accuracy of fingerprint recognition when the finger is wet.
  • an embodiment of the present application provides an optical fingerprint detection device, which is applied to an electronic device with a display screen, the electronic device has a glass cover, and the device includes:
  • a light-emitting component includes a fingerprint recognition light source, the fingerprint recognition light source is used to provide excitation light for fingerprint recognition, the light emitted by the fingerprint recognition light source is incident on the upper surface of the glass cover at an angle of incidence Greater than or equal to the total reflection angle of the light signal incident from the glass cover plate to the air;
  • the optical fingerprint detection device also includes an optical fingerprint module, which is arranged below the fingerprint detection area of the display screen, and is used to detect that the fingerprint recognition light source illuminates the finger above the fingerprint detection area and transmits from the finger And the light signal passing through the display screen;
  • the electronic device also includes a fingerprint light reflection layer located between the glass cover and the display screen, for making the fingerprint recognition light source illuminate the finger above the fingerprint detection area and return light from the finger The signal passes through, so that the fingerprint identification light source illuminates the upper surface of the glass cover to be totally reflected and the returned optical signal is totally reflected.
  • a fingerprint light reflection layer located between the glass cover and the display screen, for making the fingerprint recognition light source illuminate the finger above the fingerprint detection area and return light from the finger The signal passes through, so that the fingerprint identification light source illuminates the upper surface of the glass cover to be totally reflected and the returned optical signal is totally reflected.
  • an embodiment of the present application also provides a touch screen, including a glass cover and a display screen arranged under the glass cover, wherein the touch screen further includes the above-mentioned optical fingerprint detection device and the above-mentioned fingerprint light reflection layer.
  • an embodiment of the present application also provides an electronic device, including the above-mentioned optical fingerprint detection device.
  • the fingerprint image is not generated based on the principle of reflection imaging, but is generated based on the principle of transmission.
  • This application uses total reflection light as the light source for fingerprint identification. Since all the optical signals at the valley line are totally reflected and cannot be received by the optical fingerprint module, most of the optical signals at the ridge line are transmitted into the finger and come from the fingerprint. The ridges are transmitted through the display screen and are received by the optical fingerprint module. In this way, the optical signals returned from the ridges and valleys received by the optical fingerprint module have a higher contrast, and a better imaging effect can be obtained.
  • the fingerprint valley is filled with water, and the light is refracted at the interface between the water in the fingerprint valley and the glass cover. Since water has no backscattering property, the light derived from the water continues to be directed to the valley line of the finger And reflect back to the optical fingerprint recognition sensor through the valley line of the finger. As the light travels through the water, the optical path is increased and attenuation occurs. Therefore, after the finger is wet, the brightness of the finger tissue reflected from the fingerprint valley back to the optical fingerprint module and the finger tissue reflected from the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and the fingerprint valley and the fingerprint ridge still have a high light intensity contrast.
  • the ratio of the light intensity between the two is about 1:100, which means that compared with the prior art, the fingerprint is still better when wet. It can have better imaging quality, thereby improving the accuracy of fingerprint recognition when wet.
  • the 2D image made with finger fingerprints is placed in the fingerprint recognition position, because the 2D image and the surface of the glass cover will be in overall contact or there will be no overall contact, it is impossible to distinguish between the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light. Therefore, the fake fingerprint imaging of the 2D image does not clearly reflect the difference between the fingerprint valley and the fingerprint ridge, which reduces the probability of being recognized as a true fingerprint and improves the security.
  • the external light source can be controlled separately, and it is not necessary to wait for the pixels in the display screen to light up through the control method of the display screen, thus saving fingerprint identification.
  • the time can improve the speed and accuracy of fingerprint recognition.
  • by providing a fingerprint light reflection layer between the glass cover and the display screen when the light is reflected on the surface of the glass cover and reaches the lower surface, it will still be totally reflected and will not be coupled to the display screen below. , The problem that the light generated by the fingerprint recognition light source leaks into the display screen, and then is received by the optical fingerprint recognition sensor, causes interference, thereby improving the accuracy of fingerprint recognition.
  • Fig. 1 is a schematic diagram of an under-screen fingerprint recognition state in the prior art
  • Fig. 2 is a partial enlarged schematic diagram of a partial area of Fig. 1;
  • FIG. 3 is a schematic diagram of an electronic device in a fingerprint recognition state in an embodiment of the application.
  • FIG. 4 is a partial enlarged schematic diagram of a part of the area where light enters the glass cover in FIG. 3;
  • FIG. 5 is a partial enlarged schematic diagram of a part of the area in the glass cover plate at the fingerprint recognition location in FIG. 3;
  • Fig. 6 is a top view of the first electronic device in an embodiment of the application.
  • FIG. 7 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • FIG. 8 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • FIG. 9 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • FIG. 10 is a schematic cross-sectional structure diagram of still another electronic device in an embodiment of the application.
  • FIG. 11 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • Fig. 12 is a top view of a second type of electronic device in an embodiment of the application.
  • FIG. 13 is a top view of a third electronic device in an embodiment of the application.
  • FIG. 14 is a top view of a fourth type of electronic device in an embodiment of the application.
  • 15 is a top view of a fifth electronic device in an embodiment of the application.
  • Fig. 16 is a top view of a sixth type of electronic device in an embodiment of the application.
  • FIG. 1 is the prior art.
  • FIG. 1 is the prior art.
  • the electronic device includes a laminated glass cover 1'and a display screen 2'.
  • the display screen 2' includes a light-emitting device layer 20', and the light-emitting device layer 20' is provided with a light-emitting device ( Figure (Not shown in ), the light-emitting device realizes screen display by actively emitting light, and an optical fingerprint module 3'is provided under the light-emitting device layer 20' at the position of fingerprint recognition.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light from the fingerprint ridge and the reflected light from the fingerprint valley have different light intensities. After the reflected light passes through the display screen, it is optically fingerprinted.
  • the sensor array in the module receives and converts into the corresponding electrical signal, that is, the fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby realizing optical fingerprint recognition in the electronic device Function.
  • FIG. 2 a schematic diagram based on the principle of reflected light imaging.
  • Fingers touch the surface of the glass cover of the mobile phone during fingerprint recognition.
  • the ridges of the fingerprints of the fingers can make good contact with the surface, and the valley lines of the fingerprints of the fingers are in good contact with the surface.
  • a void, the void is air.
  • the fingerprint ridge line is in good contact, and the refractive index of the finger and the glass cover is similar, so the light absorbed by the finger IT1 is more, and the reflected light IR1 is more.
  • the refractive index difference between air and the glass cover is large, the light IT2 refracted into the finger is less, and the reflected light IR2 reflected on the surface of the glass cover is more, thus forming
  • the reflected signal IR2 at the valley line is stronger, while the reflected signal IR1 at the ridge line is weak, that is, the ridge line is dark and the valley line is bright, and the fingerprint sensor passes through the valley line and the ridge line.
  • the signal difference at the location can then form a fingerprint image.
  • the valley line and the glass cover 1' are filled with water, resulting in an increase in the light transmission part of the glass cover 1'at the valley line and a decrease in the light reflection part, resulting in the valley line.
  • the difference between the light intensity received by the ridge and the ridge is small, thus reducing the accuracy of fingerprint recognition when the fingerprint is dipped in water.
  • the prior art may recognize the fake fingerprint as a real fingerprint, which may bring security risks.
  • the prior art uses the light-emitting device in the display screen as the light source for fingerprint collection.
  • Figure 3 is a schematic diagram of an electronic device in an embodiment of this application in a fingerprint recognition state
  • Figure 4 is a partial area where light enters the glass cover in Figure 3
  • Fig. 5 is a partial enlarged schematic view of a part of the area in the glass cover plate of the fingerprint recognition in Fig. 3
  • Fig. 6 is a top view of the first electronic device in an embodiment of the application.
  • This application provides a An optical fingerprint detection device is applied to an electronic device with a display screen 1.
  • the electronic device has a glass cover 2.
  • the optical fingerprint detection device includes a light-emitting component, the light-emitting component includes a fingerprint recognition light source 3, and the fingerprint recognition light source 3 is used to provide The excitation light for fingerprint recognition, the incident angle of the light emitted by the fingerprint recognition light source 3 to the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 into the air; the optical fingerprint detection device also includes The optical fingerprint module 4 is arranged under the fingerprint detection area 10 of the display screen 1, and is used to detect the light signal that the fingerprint recognition light source 3 illuminates the finger above the fingerprint detection area 10 and transmits from the finger and passes through the display screen 1; The device also includes a fingerprint light reflection layer 01 located between the glass cover 2 and the display screen 1, which is used to make the fingerprint recognition light source 3 illuminate the finger above the fingerprint detection area 10 and the light signal returned from the finger passes through, so that the fingerprint recognition light source 3 The upper surface of the irradiated glass cover 2 is totally reflected and the returned optical signal is totally reflected.
  • the structure shown in FIGS. 3 to 5 is a cross-sectional structure of an electronic device, in which the upper side of the display screen 1 is the light-emitting side, the display screen 1 is arranged under the glass cover 2, and the fingerprint recognition light source 3 is used to generate The light used for fingerprint recognition, for example, in the structure shown in FIGS. 3 to 5, in the glass cover 2, the light generated by the fingerprint recognition light source 3 enters the glass cover 2 from the lower surface of the glass cover 2 , Launch to the upper left.
  • the display screen 1 is located under the glass cover 2, and the light generated by the fingerprint recognition light source 3 is transmitted in the glass cover 2, when it reaches the fingerprint light reflection layer 01, if the light is from the glass cover The light that is totally reflected from the upper surface of the board 2 will be totally reflected at the fingerprint light reflection layer 01 to avoid being coupled to the display screen 1.
  • the optical fingerprint module 4 may be, for example, an optical sensor array, which can collect light returned from the finger to determine the spatial pattern and position of the fingerprint ridge and fingerprint valley, and construct the fingerprint pattern and perform fingerprint recognition, for example, as a user authentication As part of the device access process, it is compared with the stored fingerprint patterns of authorized users to determine whether the detected fingerprint is a matching fingerprint.
  • the first optical signal L when the first optical signal L reaches the glass cover, due to the gap between the fingerprint valley line and the glass cover, the first optical signal L is totally reflected at the valley. Since the density of fingerprints is greater than the density of air, the total reflection angle of the optical signal from the glass cover to the ridge of the finger is greater than the total reflection angle of the optical signal from the glass cover to the air.
  • the ridge is in contact with the glass cover, A part of the first light signal that reaches the ridge is reflected, and a part is transmitted into the ridge of the finger, and the light signal transmitted into the finger is used for fingerprint imaging.
  • the reflected light LR1 at the ridge line and the reflected light LR2 at the valley line will be totally reflected on the upper and lower surfaces of the glass cover, and finally attenuated.
  • the transmitted light LT1 at the ridge After the transmitted light LT1 at the ridge enters the finger, it is transmitted from the finger to form a first return light signal. After the first return light signal passes through the display screen, it is received by the optical fingerprint module below the display screen. The optical fingerprint module performs fingerprint identification according to the received first return light signal.
  • the fingerprint sensor can hardly receive the light signal returned at the valley line, and most of the light signal at the ridge line will be transmitted into the finger, and then transmitted from the finger by the fingerprint sensor Received, so that the fingerprint sensor can perform fingerprint recognition based on the intensity difference of the light signal at the ridge and valley.
  • this application uses transmitted light for imaging, and the contrast of the light signal at the ridges and ridges can reach 1:200. In this way, using transmitted light for imaging can obtain 5 times the traditional reflected light. The imaging signal can obtain better imaging quality, which is beneficial to improve the success rate of fingerprint recognition.
  • the fingerprint valley is filled with water, and the light is refracted at the interface between the water in the fingerprint valley and the glass cover. Since water has no backscattering property, the light derived from the water continues to be directed to the valley line of the finger. , And reflected back to the optical fingerprint recognition sensor through the valley line of the finger. As the light travels through the water, the optical path is increased and attenuation occurs. Therefore, after the finger is wet, the brightness of the finger tissue reflected from the fingerprint valley back to the optical fingerprint module and the finger tissue reflected from the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and the fingerprint valley and the fingerprint ridge still have a high light intensity contrast.
  • the ratio of the light intensity between the two is about 1:100, which means that compared with the prior art, the fingerprint is still better when wet. It can have better imaging quality, thereby improving the accuracy of fingerprint recognition when wet.
  • the 2D image made with finger fingerprints is placed in the fingerprint recognition position, because the 2D image and the surface of the glass cover will be in overall contact or there will be no overall contact, it is impossible to distinguish between the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light. Therefore, the fake fingerprint imaging of the 2D image does not clearly reflect the difference between the fingerprint valley and the fingerprint ridge, which reduces the probability of being recognized as a true fingerprint and improves the security.
  • the external light source can be controlled separately, and it is not necessary to wait for the pixels in the display screen to light up through the control method of the display screen, thus saving fingerprint identification.
  • the time can improve the speed and accuracy of fingerprint recognition.
  • the angle between the initial light path that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 and the normal F of the plane where the glass cover 2 is located is ⁇ , 41.8° ⁇ 72.4°
  • the normal line F of the plane where the glass cover 2 is located is the normal of the surface of the glass cover 2 away from the display screen 1.
  • the initial light path is that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 for the first time and then starts on the glass.
  • the light path transmitted in the cover plate 2; the fingerprint light reflection layer 01 is used to attach to the lower surface of the glass cover plate 2, and the refractive index of the fingerprint light reflection layer 01 is less than 1.3.
  • the structure shown in FIGS. 3 to 5 is a cross-sectional structure of an electronic device, in which the upper side of the display screen 1 is the light-emitting side, the display screen 1 is arranged under the glass cover 2, and the fingerprint recognition light source 3 is used for The light for fingerprint recognition, the light generated by the fingerprint recognition light source 3 is incident obliquely into the glass cover 2 from the lower surface of the glass cover 2.
  • the light generated in the glass cover 2 the light generated by the fingerprint recognition light source 3 enters from the bottom right and emits to the top left. At this time, ⁇ is limited to the range of 41.8° ⁇ 72.4°.
  • the initial light of the light entering the glass cover 2 reaches the glass
  • the upper surface of the glass cover plate 2 is used as the incident surface
  • the initial light is taken as the incident light
  • ⁇ is the angle between the incident light and the normal line F of the incident surface
  • the upper surface and the lower surface of the glass cover plate 2 Parallel, when the upper surface of the glass cover 2 is in contact with air somewhere, this position may be the area outside the finger pressing, or it may be the position of the valley line where the finger presses, where the upper surface of the glass cover 2 is glass
  • the refractive index n 1 of the glass cover 2 is 1.5, while the refractive index n 2 of air is 1.
  • the display screen 1 is located under the glass cover 2, and the light generated by the fingerprint recognition light source 3 is transmitted in the glass cover 2, when it reaches the lower surface of the glass cover 2,
  • the surface is the interface between the glass and the fingerprint light reflection layer 01.
  • the fingerprint light reflection layer 01 has a refractive index less than 1.3, the light generated by the fingerprint recognition light source 3 can be reflected on the upper surface of the glass cover 2 and reach the lower surface. , It still meets the condition of total reflection, so that it will not be coupled to the display screen 1 below, which improves the problem that the light generated by the fingerprint recognition light source 3 leaks into the display screen, and then is received by the optical fingerprint module 4 and causes interference. Thereby improving the accuracy of fingerprint recognition.
  • the light generated by the fingerprint recognition light source 3 is infrared light.
  • infrared light is invisible light
  • the light generated by the display screen 1 itself is visible light.
  • the optical fingerprint module 4 can be set to be used only for Infrared light is received, but visible light is not received. In this way, the adverse effect of visible light generated by the display screen of the display screen 1 on fingerprint recognition can be reduced.
  • the wavelength of the light generated by the fingerprint recognition light source 3 is ⁇ , 920nm ⁇ 960nm.
  • the wavelength of 920nm ⁇ 960nm belongs to the wavelength of infrared light, which is invisible light.
  • the light generated when the screen 1 itself displays the screen is visible light.
  • the fingerprint recognition light source 3 generates infrared light
  • the optical fingerprint module 4 can be set at the same time to only receive infrared light and not to receive visible light.
  • the visible light generated by the display screen 1 itself can reduce the adverse effect of fingerprint recognition; on the other hand, due to natural light Among them, the light intensity of 940nm wavelength is the smallest. Therefore, using 940nm light for fingerprint recognition can reduce the adverse effect of light on fingerprint recognition when natural light passes through the finger.
  • the fingerprint light reflection layer 01 may be an adhesive layer for bonding the display screen 1 to the glass cover 2 through the adhesive layer.
  • the fingerprint light reflection layer 01 connects and fixes the display screen 1 and the glass cover plate 2 through the function of the glue layer, and on the other hand, reduces the light leakage through the refractive index difference with the glass cover plate 2, thereby reducing the interference caused by the light leakage. The interference of fingerprint recognition.
  • the fingerprint light reflection layer 01 is a coating on the surface of the glass cover 2.
  • the electronic device further includes: an adhesive layer 20 located between the fingerprint light reflective layer 01 and the display screen 1; used to make the display screen 1 adhere to the fingerprint light reflective layer 01 through the adhesive layer 20 .
  • the fingerprint light reflection layer 01 is an air layer.
  • the refractive index of air is 1, which meets the above requirements and saves material costs.
  • the side surface of the display screen 1 close to the glass cover 2 includes a display area and a non-display area surrounding the display area; the fingerprint light reflection layer 01 covers the display area; the non-display area passes through the adhesive layer 20 Bonded to the glass cover 2.
  • an air layer is set to cover the entire display area.
  • the fixing can make the glass cover 2 adhere to the display screen 1 through the glue layer 20 in the non-display area around the display area.
  • the fingerprint recognition light source 3 is a vertical-cavity surface-emitting laser (Vecsel), and the light emitted by the vertical-cavity surface-emitting laser is incident on the upper surface of the glass cover plate 2 at an angle of incidence greater than or equal to the light The signal is incident from the glass cover 2 to the air at the total reflection angle.
  • Vecsel vertical-cavity surface-emitting laser
  • the direction of the light generated is stronger, and the light emitting angle is more concentrated, that is, it is easier to control the light path of the light generated by it, for example, it is easier to make the light generated in the Total reflection occurs on the upper surface of the glass cover plate 2, that is, it is easier to realize that the incident angle generated on the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle from the glass cover plate 2 to the air.
  • the fingerprint recognition light source 3 includes a light-emitting diode and a condensing sheet located on the light-emitting side of the light-emitting diode.
  • the condensing sheet is used to converge the light generated by the light-emitting diode, and it is easier to control the light path of the generated light.
  • the light-emitting assembly further includes an optical glue 5, which is used to make the light exit surface of the fingerprint identification light source 3 adhere to the lower surface of the glass cover plate 2 through the optical glue 5; fingerprints
  • the angle between the plane where the light exit surface of the light source 3 is located and the lower surface of the glass cover plate 2 is ⁇ , and the angle ⁇ is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 to the air; the refraction of the optical glue 5
  • the rate can range from 1.4 to 1.6, including endpoint values.
  • the fingerprint recognition light source 3 can be arranged obliquely near the lower surface of the glass cover plate 2, and on the other hand, the light exit surface of the fingerprint recognition light source 3 and the glass cover plate 2 can be set up. Fill the material with the same or similar refractive index as glass to improve the light utilization rate generated by the fingerprint identification light source 3.
  • the inclination angle of the fingerprint identification light source 3 can be set according to the required angle of the light in the glass cover plate 2.
  • FIG. 9 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • the light-emitting component further includes: a first optical coupler 601, and the first optical coupler 601 includes a first surface 61 and the second surface 62, the included angle between the first surface 61 and the second surface 62 is ⁇ , the included angle ⁇ is greater than or equal to the total reflection angle of the optical signal from the glass cover 2 to the air; the first optical coupler The first surface 61 of the 601 is used to attach to the lower surface of the glass cover 2.
  • the first surface 61 of the first optical coupler 601 and the lower surface of the glass cover 2 are parallel; the light exit surface of the fingerprint recognition light source 3 is used to pass the optical Glue (not shown in FIG. 7) is adhered to the second surface 62 of the first optical coupler 601, and the light exit surface of the fingerprint identification light source 3 is parallel to the second surface 62 of the first optical coupler 601; the refraction of the optical glue
  • the rate is 1.4 to 1.6, including the endpoint value.
  • the first optical coupler 601 may specifically be a glass structural member with a trapezoidal cross-section.
  • the first surface 61 is attached to the lower surface of the glass cover 2 and the second surface 62 is attached to the fingerprint recognition light source 3.
  • the light exit surface so that when it couples the light generated from the fingerprint recognition light source 3 into the glass cover 2, the light utilization rate generated by the fingerprint recognition light source 3 can be improved, so that the light path can be in the glass cover 2 according to the needs of the light path.
  • the inclination angle of the fingerprint recognition light source 3 can be set in the direction of, even if the angle between the light output surface of the fingerprint recognition light source 3 and the lower surface of the glass cover 2 is set to ⁇ .
  • FIG. 10 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of this application.
  • the light-emitting assembly further includes: a second optical coupler 602, and the second optical coupler 602 includes a third The surface 63, the fourth surface 64, and the fifth surface 65 connecting the third surface 63 and the fourth surface 64.
  • the third surface 63 of the second optical coupler 602 is used to attach to the lower surface of the glass cover 2 for fingerprint recognition
  • the light exit surface of the light source 3 is used to adhere to the fourth surface 64 of the second optical coupler 602 through optical glue.
  • the refractive index of the optical glue can be 1.4 to 1.6, including the endpoint value;
  • the fifth surface 65 of the second optical coupler 602 is reflected and incident on the glass cover 2.
  • the structure shown in FIG. 10 is similar to the structure shown in FIG. 9, the difference is that in the structure shown in FIG.
  • the light path is adjusted in the optical coupler 602, for example, the light path will be reflected, and then coupled into the glass cover plate 2 through the third surface 63, which is easier to control in the glass cover plate 2.
  • the incident initial light path is on the plane of the glass cover plate 2 The angle between the normals of, in order to improve the light utilization rate generated by the fingerprint identification light source 3.
  • FIG. 11 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application.
  • the electronic device further includes: a middle frame 7 located on the side of the display screen 1 away from the glass cover 2.
  • the identification light source 3 is used to be arranged on the middle frame 7;
  • the light-emitting assembly further includes a reflector 600 located under the glass cover 2. The light emitted by the fingerprint identification light source 3 is reflected by the reflector 600 and then enters the glass cover 2, and The incident angle to the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 to the air.
  • the fingerprint recognition light source 3 is arranged on the middle frame 7 below the display screen 1, and the light output path of the fingerprint recognition light source 3 can be adjusted by the fingerprint recognition light source 3 and the middle frame 7 to improve the fingerprint recognition light source 3.
  • the reflective device 600 is arranged on the side of the display screen 1, and the reflective surface of the reflective device 600 is perpendicular to the upper surface of the glass cover 2.
  • the fingerprint recognition light source 3 includes a first light source 31, and the display screen 1 includes a first position 101 opposite to where the first light source 31 is located, and a position where the optical fingerprint module 4 is located.
  • the second position 102 is the position where the fingerprint detection area 10 is located, and the first position 101 is located at a position where the center of the second position 102 extends along the length direction of the display screen 1.
  • the fingerprint detection area 10 is located close to the bottom frame area 84 of the electronic device to facilitate the user to place fingers for fingerprint recognition.
  • the fingerprint recognition light source 3 is set in the bottom frame area 84 to prevent adverse effects on the display area.
  • the location of the fingerprint detection area 10 is relatively close, which is convenient to provide the light source required for fingerprint identification.
  • FIG. 12 is a top view of the second type of electronic device in an embodiment of this application
  • FIG. 13 is a top view of the third type of electronic device in an embodiment of this application
  • fingerprint recognition The light source 3 includes a first light source 31, and the display screen 1 includes a first position 101 opposite to the position where the first light source 31 is located, and a second position 102 opposite to the position where the optical fingerprint module 4 is located, and the first position 101 is located at the second position
  • the center of 102 is one side of a position extending along the length direction of the display screen 1.
  • the difference between the structure shown in FIG. 12 and the structure shown in FIG. 6 is that two fingerprint recognition light sources 3 are provided in the bottom frame area 84.
  • the difference between the structure shown in FIG. 13 and the structure shown in FIG. 12 is that the two fingerprint recognition light sources 3 are respectively located at opposite ends of the bottom frame area 84, and the fingerprint detection area 10 can be provided from different directions for fingerprint recognition. Light.
  • FIG. 14 is a top view of the fourth type of electronic device in the embodiment of the application.
  • the fingerprint recognition light source 3 includes a second light source 32 and a third light source 33
  • the display screen 1 includes a second light source 32 and a third light source 33.
  • the third position 103 opposite to the position of the second light source 32, the fourth position 104 opposite to the position of the third light source 33, and the second position 102, the third position 103 and the fourth position opposite to the position of the optical fingerprint module 4 104 is provided on both sides of the position extending along the length direction of the display screen 1 in the central position of the second position 102.
  • the two fingerprint recognition light sources 3 are respectively located in the first side frame area 81 and the second side frame area 82 on the left and right sides, and the fingerprint recognition light source 3 and the fingerprint detection area 10 are both located near the bottom. .
  • FIG. 15 is a top view of the fifth type of electronic device in an embodiment of this application
  • FIG. 16 is a top view of the sixth type of electronic device in an embodiment of this application. It includes a first side frame area 81 and a second side frame area 82 opposite to each other.
  • the electronic device also includes a top frame area 83 and a bottom frame area 84 opposite to each other; the distance between the fingerprint detection area 10 and the first side frame area 81 is h1 , The distance to the second side frame area 82 is h2, the distance to the top frame area 83 is h3, and the distance to the bottom frame area 84 is h4, h3>h1, h3>h2, h3>h4; fingerprint recognition light source
  • the number of 3 is one or more; as shown in Figure 6, if the number of fingerprint identification light source 3 is one, then the fingerprint identification light source 3 is located in the bottom frame area 84; as shown in Figures 12 to 16, if the fingerprint identification light source 3 If the number is multiple, the multiple fingerprint recognition light sources 3 are located in at least one of the first side frame area 81, the second side frame area 82, and the bottom frame area 84, and any one of the fingerprint recognition light source 3 and the fingerprint detection area The distance between 10 is less than h3.
  • three fingerprint recognition light sources 3 are provided in the bottom frame area 84, including the first position 101 located at the center of the second position 102 extending along the length direction of the display screen 1, and including The first position 101 is located on the side of the position where the center of the second position 102 extends along the length direction of the display screen 1.
  • FIG. 15 In the structure shown in FIG. 15, three fingerprint recognition light sources 3 are provided in the bottom frame area 84, including the first position 101 located at the center of the second position 102 extending along the length direction of the display screen 1, and including The first position 101 is located on the side of the position where the center of the second position 102 extends along the length direction of the display screen 1.
  • a fingerprint recognition light source 3 is provided in each of the first side frame area 81, the second side frame area 82, and the bottom frame area 84, wherein the third position 103 corresponding to the second light source 32 is located In the first side frame area 81, the fourth position 104 corresponding to the third light source 33 is located in the second side frame area 82, and the first position 101 corresponding to the first light source 31 is located in the bottom frame area 84.
  • an embodiment of the present application also provides a touch screen, including a glass cover 2 and a display screen 1 arranged under the glass cover 2, wherein the touch screen further includes the optical fingerprints in the foregoing embodiments The detection device and the fingerprint light reflection layer 01 described above.
  • the touch screen may be any touch screen device with a display function, such as a touch screen, a mobile phone, a tablet computer, a notebook computer, or a television.
  • the display screen 1 may specifically be, for example, an OLED (Organic Light-Emitting Diode, OLED) display screen.
  • OLED Organic Light-Emitting Diode
  • the display screen 1 may specifically include a polarizing plate 21, a quarter wave plate 22, a touch layer 23, an encapsulation layer 24, and an organic light emitting device layer 25 stacked in sequence. And circuit control layer 26.
  • the angle between the initial light path that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 and the normal F of the plane where the glass cover 2 is located is ⁇ , 41.8° ⁇ 72.4°
  • the normal line F of the plane where the glass cover 2 is located is the normal of the surface of the glass cover 2 away from the display screen 1.
  • the initial light path is that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 for the first time and then starts on the glass.
  • the light path transmitted in the cover plate 2; the fingerprint light reflection layer 01 is used to attach to the lower surface of the glass cover plate 2, and the refractive index of the fingerprint light reflection layer 01 is less than 1.3.
  • the fingerprint light reflection layer 01 may be an adhesive layer, and the display screen 1 is adhered to the glass cover 2 through the adhesive layer.
  • the fingerprint light reflection layer 01 connects and fixes the display screen 1 and the glass cover plate 2 through the function of the glue layer, and on the other hand, reduces the light leakage through the refractive index difference with the glass cover plate 2, thereby reducing the interference caused by the light leakage. The interference of fingerprint recognition.
  • the fingerprint light reflection layer 01 is a coating on the surface of the glass cover 2.
  • the touch screen further includes: an adhesive layer 20 between the fingerprint light reflective layer 01 and the display screen 1; the display screen 1 is adhered to the fingerprint light reflective layer 01 through the adhesive layer 20.
  • the fingerprint light reflection layer 01 is an air layer.
  • the refractive index of air is 1, which meets the above requirements and saves material costs.
  • the side surface of the display screen 1 close to the glass cover 2 includes a display area and a non-display area surrounding the display area; the fingerprint light reflection layer 01 covers the display area; the non-display area is bonded to the glass cover 2 through an adhesive layer 20.
  • an air layer is set to cover the entire display area.
  • the fixing can make the glass cover 2 adhere to the display screen 1 through the glue layer 20 in the non-display area around the display area.
  • An embodiment of the present application also provides an electronic device, including the optical fingerprint detection device in the foregoing embodiments.
  • the specific structure and principle of the optical fingerprint detection device are the same as the foregoing embodiment, and will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
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  • General Physics & Mathematics (AREA)
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  • General Engineering & Computer Science (AREA)
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Abstract

L'invention concerne un appareil optique de détection d'empreintes digitales, un écran tactile et un dispositif électronique, qui se rapportent au domaine technique de la reconnaissance d'empreintes digitales, et peuvent améliorer la précision de la reconnaissance d'empreintes digitales lorsqu'un doigt est humide. L'appareil optique de détection d'empreintes digitales comprend un ensemble électroluminescent, l'ensemble électroluminescent comprenant une source de lumière de reconnaissance d'empreintes digitales (3), et l'angle d'incidence à hauteur duquel la lumière qui est émise par la source de lumière de reconnaissance d'empreintes digitales (3) est incidente sur une surface supérieure d'une plaque de couverture en verre (2) est supérieur ou égal à l'angle de réflexion totale à hauteur duquel un signal lumineux est incident à l'air provenant de la plaque de couverture en verre (2). L'appareil optique de détection d'empreintes digitales comprend en outre un module d'empreintes digitales optique (4). L'appareil optique de détection d'empreintes digitales comprend en outre une couche de réflexion de lumière d'empreintes digitales (01) située entre la plaque de couverture en verre (2) et un écran d'affichage (1), la couche de réflexion de lumière d'empreintes digitales servant à fabriquer le signal de lumière, qui est généré lorsque la source de lumière de reconnaissance d'empreintes digitales (3) rayonne sur un doigt au-dessus d'une zone de détection d'empreintes digitales (10) et est renvoyée par le doigt, pénètre à travers celle-ci, de sorte que le signal lumineux, qui est totalement réfléchi lorsque la source de lumière de reconnaissance d'empreintes digitales (3) rayonne sur la surface supérieure de la plaque de couverture en verre (2) et est renvoyée, soit soumis à une réflexion totale.
PCT/CN2020/073631 2020-01-21 2020-01-21 Appareil optique de détection d'empreintes digitales, écran tactile et dispositif électronique WO2021146956A1 (fr)

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PCT/CN2020/073631 WO2021146956A1 (fr) 2020-01-21 2020-01-21 Appareil optique de détection d'empreintes digitales, écran tactile et dispositif électronique
CN202080001593.7A CN112334909A (zh) 2020-01-21 2020-01-21 光学指纹检测装置、触摸屏和电子设备

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CN113138482B (zh) * 2021-04-28 2022-08-05 武汉华星光电技术有限公司 显示面板及显示装置
CN113377242B (zh) * 2021-06-22 2023-12-15 武汉华星光电技术有限公司 显示模组
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