WO2021051412A1 - 指纹检测的装置、显示屏和电子设备 - Google Patents

指纹检测的装置、显示屏和电子设备 Download PDF

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Publication number
WO2021051412A1
WO2021051412A1 PCT/CN2019/107105 CN2019107105W WO2021051412A1 WO 2021051412 A1 WO2021051412 A1 WO 2021051412A1 CN 2019107105 W CN2019107105 W CN 2019107105W WO 2021051412 A1 WO2021051412 A1 WO 2021051412A1
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WO
WIPO (PCT)
Prior art keywords
display screen
opening
area
light source
circuit board
Prior art date
Application number
PCT/CN2019/107105
Other languages
English (en)
French (fr)
Inventor
青小刚
刘文拯
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 CN201980003994.3A priority Critical patent/CN111095271B/zh
Priority to PCT/CN2019/107105 priority patent/WO2021051412A1/zh
Publication of WO2021051412A1 publication Critical patent/WO2021051412A1/zh

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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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

Definitions

  • the embodiments of the present application relate to the field of biometric identification, and more specifically, to a fingerprint detection device, a display screen, and an electronic device.
  • the optical fingerprint module collects the light signal returned by the reflection and transmission of the finger above the display screen, and realizes the under-screen optical fingerprint detection according to the fingerprint information of the finger carried in the light signal.
  • a liquid crystal display Liquid-Crystal Display, LCD
  • a backlight module it is necessary to use a backlight module to provide a uniform background light source. Visible light cannot be transmitted through the reflective film in the backlight module. Therefore, in order to realize the under-screen optical fingerprint detection, an additional supplementary light source needs to be used.
  • the fill light source occupies a part of the space under the display screen, increasing the width of the non-display area of the display screen, that is, the "chin" area.
  • the embodiments of the present application provide a fingerprint detection device, a display screen, and an electronic device, which can realize under-screen optical fingerprint detection without increasing the area of the non-display area of the display screen.
  • a fingerprint detection device which is applied to an electronic device with a display screen.
  • the display screen includes a liquid crystal panel and a backlight module.
  • the circuit board of the liquid crystal panel is in a non-display area of the display screen.
  • a bending area is formed below, an opening is provided in the bending area of the circuit board, and the device includes:
  • the light source is arranged in the opening, wherein the opening forms a light channel from the light source to the fingerprint detection area in the display screen;
  • the optical fingerprint module is arranged under the display screen, and is used to detect the light signal that the light source illuminates the finger above the fingerprint detection area and returns from the finger.
  • the opening includes a first opening and a second opening, the first opening is located in a part of the bending area perpendicular to the display screen, and the second opening is The opening is located in a part of the bending area that is close to the display screen and parallel to the display screen.
  • the first opening and the second opening are connected at a right angle on a side of the bending area close to the display screen.
  • the light source is fixed to the middle frame on the side of the electronic device.
  • the number of the light sources is multiple, and the multiple light sources are arranged in the same or different openings.
  • the light source is an infrared light source.
  • the opening occupies a wiring area on the circuit board.
  • the circuit board of the light source forms a bending area under the non-display area.
  • the chip of the liquid crystal panel adopts a COF or COG packaging manner.
  • the optical fingerprint module is arranged below the display area of the display screen.
  • the display screen further includes a glass cover, the liquid crystal panel and the backlight module are located under the glass cover, and the area where the liquid crystal panel and the backlight module are located The display area of the display screen is formed.
  • the circuit board of the liquid crystal panel is a flexible printed circuit (FPC).
  • FPC flexible printed circuit
  • a display screen in a second aspect, includes a liquid crystal panel and a backlight module, wherein the circuit board of the liquid crystal panel forms a bending area under the non-display area of the display screen, and the circuit An opening is provided in the bending area of the board to provide a light source for fingerprint detection and form a light channel from the light source to the fingerprint detection area in the display screen.
  • the opening includes a first opening and a second opening, the first opening is located in a part of the bending area perpendicular to the display screen, and the second opening is The opening is located in a part of the bending area that is close to the display screen and parallel to the display screen.
  • the first opening and the second opening are connected at a right angle on a side of the bending area close to the display screen.
  • the light source is fixed to the middle frame on the side of the electronic device.
  • the number of the light sources is multiple, and the multiple light sources are arranged in the same or different openings.
  • the opening occupies a wiring area on the circuit board.
  • the chip of the liquid crystal panel adopts a COF or COG packaging manner.
  • the display screen further includes a glass cover, the liquid crystal panel and the backlight module are located under the glass cover, and the area where the liquid crystal panel and the backlight module are located The display area of the display screen is formed.
  • an electronic device including:
  • the display screen includes a liquid crystal panel and a backlight module, wherein the circuit board of the liquid crystal panel forms a bending area under the non-display area of the display screen, and an opening is provided in the bending area of the circuit board;
  • the light source is arranged in the opening, wherein the opening forms a light channel from the light source to the fingerprint detection area in the display screen;
  • the optical fingerprint module is arranged under the display screen, and is used to detect the light signal that the light source illuminates the finger above the fingerprint detection area and returns from the finger.
  • the opening includes a first opening and a second opening, the first opening is located in a part of the bending area perpendicular to the display screen, and the second opening is The opening is located in a part of the bending area that is close to the display screen and parallel to the display screen.
  • the first opening and the second opening are connected at a right angle on a side of the bending area close to the display screen.
  • the light source is fixed to the middle frame on the side of the electronic device.
  • the number of the light sources is multiple, and the multiple light sources are arranged in the same or different openings.
  • the light source is an infrared light source.
  • the opening occupies a wiring area on the circuit board.
  • the circuit board of the light source forms a bending area under the non-display area.
  • the chip of the liquid crystal panel adopts a COF or COG packaging manner.
  • the optical fingerprint module is arranged below the display area of the display screen.
  • the display screen further includes a glass cover, the liquid crystal panel and the backlight module are located under the glass cover, and the area where the liquid crystal panel and the backlight module are located The display area of the display screen is formed.
  • the circuit board of the liquid crystal panel is an FPC.
  • an electronic device including:
  • the fingerprint detection device in the first aspect or any possible implementation of the first aspect;
  • the second aspect or the display screen in any possible implementation of the second aspect is not limited
  • openings are made on the circuit board of the liquid crystal panel for arranging the light source, so that the light source can be used for fingerprint detection without increasing the area of the non-display area of the display screen.
  • FIGS 1A and Figures are schematic diagrams of electronic devices to which the present application can be applied.
  • Figures 1B and 2B are schematic cross-sectional views of the electronic device shown in Figures 1A and 2A along the A-A' direction, respectively.
  • Figure 3 is a schematic diagram of the display screen.
  • Fig. 4 is a schematic diagram of a backlight module.
  • Fig. 5 is a schematic block diagram of a display screen according to an embodiment of the present application.
  • Fig. 6 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • Fig. 7 is a schematic diagram of a supplementary light source.
  • Fig. 8 is a schematic diagram of fingerprint detection.
  • Fig. 9 is a schematic diagram showing that the supplementary light source causes the "chin" area to widen.
  • FIG. 10 is a schematic diagram showing that the circuit board of the liquid crystal panel is bent under the non-display area.
  • FIG. 11 is a schematic diagram of the openings on the circuit board of the liquid crystal panel of the embodiment of the present application.
  • FIG 12 and 13 are schematic diagrams of the first opening and the second opening on the circuit board of the liquid crystal panel of the embodiment of the present application.
  • 14 to 16 are schematic diagrams showing that the first opening and the second opening on the circuit board of the liquid crystal panel of the embodiment of the present application are connected at right angles.
  • Fig. 17 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • the embodiments of this application can be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint detection systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging.
  • the embodiments of this application only take optical fingerprint systems as an example
  • the embodiments of the present application should not constitute any limitation, and the embodiments of the present application are also applicable to other systems that use optical, ultrasonic, or other imaging technologies.
  • the optical fingerprint system provided in the embodiments of the present application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other electronic devices; more specifically, in the above electronic devices, the optical fingerprint The module can be set in a partial area or the entire area under the display screen to form an under-display or under-screen optical fingerprint system.
  • the optical fingerprint module may also be partially or fully integrated into the display screen of the electronic device, thereby forming an in-display or in-screen optical fingerprint system.
  • the under-screen optical fingerprint detection technology uses light returned from the top surface of the device's display assembly to perform fingerprint sensing and other sensing operations.
  • the returned light carries the information of the object in contact with the top surface, such as a finger.
  • the optical fingerprint detection of the specific optical sensor module located under the display screen is realized.
  • the design of the optical sensor module can be to achieve desired optical imaging by appropriately configuring optical elements for collecting and detecting the returned light.
  • Figures 1A and 2A show schematic diagrams of electronic devices to which the embodiments of the present application can be applied.
  • 1A and 2A are schematic diagrams of the orientation of the electronic device 10
  • Figs. 1B and 2B are schematic partial cross-sectional diagrams of the electronic device 10 shown in Figs. 1A and 2A along the direction A-A', respectively.
  • the electronic device 10 includes a display screen 120 and an optical fingerprint module 130.
  • the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
  • the optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131 (also referred to as pixels, photosensitive pixels, pixel units, etc.).
  • the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 of the optical fingerprint module 130. As shown in FIG. 1A, the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint module 130 is arranged in another position, such as on the side of the display screen 120 or the non-transmissive area at the edge of the electronic device 10, and the optical fingerprint module 130 is designed to The optical signal from at least a part of the display area of the display screen 120 is guided to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the area of the fingerprint detection area 103 may be different from the area of the sensing array 133 of the optical fingerprint module 130, such as an optical path design for imaging through a lens, a reflective folding optical path design, or other optical path designs such as light convergence or reflection. , So that the area of the fingerprint detection area 103 of the optical fingerprint module 130 is larger than the area of the sensing array 133 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can also be designed to be the same as the area of the sensing array 133 of the optical fingerprint module 130. Basically the same.
  • the electronic device 10 adopting the above structure does not need to reserve space on the front side to set a fingerprint button (such as the Home button), so that a full-screen solution can be adopted, that is, the display area of the display screen 120 It can be basically extended to the front of the entire electronic device 10.
  • a fingerprint button such as the Home button
  • the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes the sensor array 133, a reading circuit electrically connected to the sensor array 133, and other auxiliary circuits, which can be fabricated on a chip (Die) by a semiconductor process to form an optical fingerprint sensor ( Also called optical fingerprint chip, sensor, sensor chip, chip, etc.).
  • the sensing array 133 is specifically a photodetector (Photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the above-mentioned optical sensing unit.
  • the optical component 132 may be disposed above the sensing array 133 of the light detecting part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements. It can be used to filter out the ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the surface of the finger to the sensor array 133 for fingerprint detection.
  • a filter layer Finter
  • a light guide layer or a light path guiding structure and other optical elements. It can be used to filter out the ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the surface of the finger to the sensor array 133 for fingerprint detection.
  • the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the optical detection part 134 may be packaged in the same optical fingerprint chip, or the optical component 132 may be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.
  • the light guide layer of the optical component 132 has multiple implementation schemes.
  • the light guide layer may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has a plurality of collimator units or a micro-hole array, and the collimator unit may be specifically small holes, from Among the reflected light reflected by the finger, the light incident perpendicularly to the collimating unit can pass through and be received by the optical sensing unit below it, while the light with an excessively large incident angle is reflected in the collimating unit multiple times.
  • each optical sensing unit can basically only receive the reflected light reflected by the fingerprint lines directly above it, so that the sensing array 133 can detect the fingerprint image of the finger.
  • the light guide layer may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which is used to The reflected light reflected from the finger is condensed to the sensing array 133 of the light detection part 134 below it, so that the sensing array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger.
  • the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve The fingerprint imaging effect of the optical fingerprint module 130 is described.
  • the light guide layer may also specifically adopt a micro-lens (Micro-Lens) layer.
  • the micro-lens layer has a micro-lens array formed by a plurality of micro-lens, which may be obtained through a semiconductor growth process or other processes. It is formed above the sensing array 133 of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array 133, respectively.
  • Another optical film layer such as a dielectric layer or a passivation layer, may also be formed between the micro lens layer and the sensing unit.
  • a light blocking layer also called a light blocking layer, a light blocking layer, etc.
  • the light blocking layer can block the optical interference between the adjacent microlens and the sensor unit, and make the light corresponding to the sensor unit converge into the microhole through the microlens, and It is transmitted to the sensing unit via the micro-hole for optical fingerprint imaging.
  • a micro lens layer may be further provided above or below the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the microlens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (OLED) display or a micro-LED (Micro-LED) display.
  • OLED organic light-emitting diode
  • Micro-LED micro-LED
  • the optical fingerprint module 130 can use the display unit (ie, an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the display screen 120 emits a beam of light 111 to the finger 140 above the fingerprint detection area 103.
  • the light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers.
  • the finger 140 scatters inside to form scattered light.
  • the above-mentioned reflected light and scattered light are also collectively referred to as reflected light. Since the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132 Then, it is received by the sensing array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal. Based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification is further performed, thereby realizing an optical fingerprint detection function in the electronic device 10.
  • the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection.
  • the optical fingerprint module 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the excitation light source may specifically be an infrared light source or a light source of non-visible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the electronic device 10, and the The optical fingerprint module 130 can be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 can also be arranged in all areas. Below the backlight module, and the backlight module is designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical Fingerprint module 130.
  • the optical fingerprint module 130 adopts a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.
  • the electronic device 10 may also include a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the electronic device.
  • the front of 10. Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
  • the electronic device 10 may further include a circuit board 150, and the circuit board 150 is disposed under the optical fingerprint module 130.
  • the optical fingerprint module 130 can be adhered to the circuit board 150 through adhesive, and is electrically connected to the circuit board 150 through soldering pads and metal wires.
  • the optical fingerprint module 130 can realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 10 through the circuit board 150.
  • the optical fingerprint module 130 may receive the control signal of the processing unit of the electronic device 10 through the circuit board 150, and may also output the fingerprint detection signal from the optical fingerprint module 130 to the processing unit of the terminal device 10 through the circuit board 150. Control unit, etc.
  • the optical fingerprint module 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position. Therefore, the user needs to input fingerprints. Press the finger to a specific position of the fingerprint detection area 103, otherwise the optical fingerprint module 130 may not be able to collect fingerprint images, resulting in poor user experience.
  • the optical fingerprint module 130 may include multiple optical fingerprint sensors. The multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 103 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Further, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.
  • the optical fingerprint module 130 in the electronic device 10 includes a plurality of optical fingerprint sensors, and the plurality of optical fingerprint sensors may be arranged side by side in the Below the display screen 120 and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 103 of the optical fingerprint module 130.
  • the optical component 132 may include multiple light guide layers, and each light guide layer corresponds to an optical fingerprint sensor, They are respectively attached and arranged above the corresponding optical fingerprint sensor.
  • the plurality of optical fingerprint sensors may also share an integral light guide layer, that is, the light guide layer has an area large enough to cover the sensing array of the plurality of optical fingerprint sensors.
  • the optical component 132 may also include other optical elements, such as a filter layer (Filter) or other optical films, which may be arranged between the light guide layer and the optical fingerprint sensor, or may be arranged on the optical fingerprint sensor.
  • the display screen 120 and the light guide layer are mainly used to isolate the influence of external interference light on the optical fingerprint detection.
  • the filter layer may be used to filter the ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120. Similar to the light guide layer, the filter layer may be separately provided for each optical fingerprint sensor to filter out interference light, or a large-area filter may be used to simultaneously cover the multiple optical fingerprint sensors.
  • the light guide layer may also be replaced by an optical lens (Lens), and a small hole formed by a light-shielding material above the optical lens can cooperate with the optical lens to converge fingerprint detection light to an optical fingerprint sensor below to realize fingerprint imaging.
  • each optical fingerprint sensor may be separately configured with an optical lens to perform fingerprint imaging, or the multiple optical fingerprint sensors may also use the same optical lens to achieve light convergence and fingerprint imaging.
  • each optical fingerprint sensor may even have two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), and two or more optical lenses are configured to cooperate with the two at the same time. Or multiple sensing arrays perform optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.
  • the display screen 500 includes a liquid crystal layer 510 and a backlight module 520 located under the liquid crystal layer 510.
  • the liquid crystal layer 510 includes a cover glass 511 and a liquid crystal panel 512.
  • the backlight module 520 includes a brightness enhancement film 521, a light homogenizing film 522, a light guide plate 523, a reflective film 524, and a reinforcing steel plate 525 in sequence.
  • the reflective film 524 cannot transmit visible light, so an additional supplementary light source is needed for fingerprint detection.
  • the supplemental light source occupies a part of the space below the display screen and increases the width of the non-display area of the display screen. Therefore, the area of the display area in the display screen is reduced, which reduces the screen-to-body ratio of the electronic device.
  • the light sources mentioned all refer to the supplementary light source.
  • openings are made on the circuit board of the liquid crystal panel under the non-display area for arranging the light source, so that the light source can be used without increasing the area of the non-display area of the display screen. Fingerprint detection.
  • FIG. 5 is a schematic block diagram of a display screen 500 according to an embodiment of the present application.
  • the display screen 500 includes a liquid crystal panel 512 and a backlight module 520.
  • the circuit board 513 of the liquid crystal panel 512 forms a bending area under the non-display area of the display screen 500, and an opening is provided in the bending area of the circuit board 513 to provide a light source for fingerprint detection. 610, and form a light channel from the light source 610 to the fingerprint detection area in the display screen 500.
  • FIG. 6 is a schematic block diagram of a fingerprint detection device 600 according to an embodiment of the present application.
  • the device 600 is applied to an electronic device with a display screen 500. As shown in FIG. 6, the device 600 includes:
  • the light source 610 is arranged in the opening
  • the optical fingerprint module 620 is disposed under the display screen 500 and is used to detect the light signal returned from the finger above the fingerprint detection area irradiated by the light source 610.
  • openings are made on the circuit board of the liquid crystal panel under the non-display area for arranging the light source, so that the light source can be used without increasing the area of the non-display area of the display screen. Fingerprint detection.
  • the display screen 500 may further include a glass cover plate 511, and the liquid crystal panel 512 and the backlight module 520 are located under the glass cover plate 511. The area where the liquid crystal panel 512 and the backlight module 520 are located forms the display area of the display screen 500.
  • Figures 7 and 8 are respectively a top view and a side view of the electronic device.
  • the fingerprint detection area 5011 is located in the display area 501 of the display screen 500 shown in FIG. 7, the non-display area 502 of the display screen 500 is also called the "chin" area of the electronic device, and the light source 610 for fingerprint detection is located in the non-display area 502 of the electronic device.
  • the liquid crystal panel 512 and the backlight module 520 in sequence.
  • the area where the liquid crystal panel 512 and the backlight module 520 are located forms the display area 501 of the display screen 500.
  • the space below the non-display area 502 of the display screen 500 can be used to accommodate the circuit board 513 of the liquid crystal panel 512 and the light source 610.
  • the light signal emitted by the light source 610 irradiates the finger above the fingerprint detection area 5011, and returns to the optical fingerprint module 620 below the backlight module 520 through the reflection and scattering of the finger.
  • the optical signal carries the fingerprint information of the finger.
  • the optical fingerprint module 620 receives the optical signal for fingerprint detection.
  • the optical fingerprint module 620 can be arranged under the display area 501 of the display screen 500 or under the non-display area 502 thereof. In FIG. 8, only the optical fingerprint module 620 is disposed under the backlight module 520 as an example for description.
  • the light source 610 may be an infrared light source, for example. In this way, the light signal returned by the finger can pass through the backlight module 520 to reach the optical fingerprint module 620.
  • optical fingerprint module 620 may be, for example, the optical fingerprint module 130 shown in FIG. 1B and FIG. 2B.
  • details are not repeated here.
  • the circuit board 513 of the liquid crystal panel 512 may be, for example, an FPC.
  • the chip of the liquid crystal panel 512 may be, for example, a chip on FPC (Chip On FPC, COF) packaging method; or a chip on glass (Chip On Glass, COG) packaging method.
  • COF packaging method the chip of the liquid crystal panel 512 can be fixed on the FPC of the liquid crystal panel 512.
  • COG packaging method the chip of the liquid crystal panel 512 can be fixed on the glass cover 511, and then lead to the FPC.
  • the circuit board 513 of the liquid crystal panel 512 will form a bending area under the non-display area 502 of the display screen 500.
  • the light source 610 and its circuit board 611 are arranged under the non-display area 502 and are pasted on the middle frame 710 on the side of the electronic device by a double-sided adhesive 612. It can be seen that in order to provide the light source 610, the width of the non-display area 502 needs to be increased by W, which is usually greater than 0.7 mm. Correspondingly, this reduces the width of the display area 501, which affects the user experience.
  • FIG. 10 shows the bending area 5131 of the circuit board 513 of the liquid crystal panel 512.
  • the circuit board 513 is bent under the non-display area 502 of the display screen 500 to form a bent area 5131.
  • the bent circuit board 513 is connected to the main board 720 of the electronic device through its interface 5133.
  • the circuit board 513 needs to reserve enough space for bending, for example, 0.7 mm to 0.8 mm.
  • a certain safety distance should be reserved between the circuit board 513 and the side middle frame 710, for example, about 0.3 mm.
  • a light source 610 needs to be added under the non-display area 502.
  • an opening is provided in the bending area 5131 of the circuit board 513 below the non-display area 502 for accommodating the light source 610.
  • the opening can form a light channel from the light source 610 to the fingerprint detection area 5011 in the display screen 500.
  • the embodiment of the present application does not limit the position of the opening, and the opening can be used for arranging the light source 610 and forming a light channel from the light source 610 to the fingerprint detection area 5011.
  • Figure 11 shows a top view of the electronic device.
  • the circuit board 513 of the liquid crystal panel 512 is bent under the "chin" area of the display screen and forms a bending area 5131.
  • An opening 5132 is provided in the bending area 5131 of the circuit board 513, and the opening 5132 is used to provide a light source 610.
  • the light emitted by the light source 610 should be able to be transmitted to the fingerprint detection area 5011 through the opening 5132, so as to be used for fingerprint detection.
  • the opening 5132 may include a first opening 5132A and a second opening 5132B.
  • the first opening 5132A is located in the portion of the bending area 5131 that is perpendicular to the display screen
  • the second opening 5132B is located in the portion of the bending area 5131 that is close to and parallel to the display screen.
  • the bending area 5131 of the circuit board 513 of the liquid crystal panel 512 includes a portion perpendicular to the display screen and a portion parallel to the display screen.
  • the opening 5132 provided on the bending area 5131 includes a first opening 5132A and a second opening 5132B.
  • the first opening 5132A is located in an area perpendicular to the display screen in the bending area 5131
  • the second opening 5132B is located in an area parallel to and close to the display screen in the bending area 5131.
  • the light source 610 is disposed in the first opening 5132A.
  • the second opening 5132B can form an optical channel from the light source 610 to the fingerprint detection area 5011 between the second opening 5132B and the first opening 5132A, the light emitted by the light source 610 can be transmitted to the fingerprint through the optical channel. Detect the finger above the area 5011. The light returned by the finger is collected by the optical fingerprint module 620 to be used for fingerprint detection.
  • Figures 12 and 13 show four first openings 5132A for setting four light sources 610 respectively, and show the corresponding four second openings 5132B, but the application is not limited thereto.
  • the number of the first opening 5132A may be multiple, which are respectively used for arranging multiple light sources 610; the number of the first opening 5132A may also be one, so that the multiple light sources 610 are arranged in the same opening.
  • the number of the second opening 5132B may be one or more, as long as it can form an optical channel from the light source 610 to the fingerprint detection area between the first opening 5132A and the first opening 5132A.
  • the numbers of the first opening 5132A and the second opening 5132B may be equal or not equal.
  • first opening 5132A and the second opening 5132B are connected at a right angle on the side of the bending area 5131 close to the display screen.
  • Fig. 16 is a top view.
  • the opening 5132 is located at the right angle on the side close to the display screen, that is, the first opening 5132A and the second opening 5132B in FIGS. 12 and 13 communicate at the right angle.
  • a hole is dug at the right angle of the bending area 5131 to form an opening 5132.
  • the light source 610 is arranged in the opening 5132 at the right angle, and the light emitted by the light source 610 can directly illuminate the finger above the fingerprint detection area 5011.
  • four light sources 610 are taken as an example, and they are respectively arranged in the four openings 5132.
  • the light source shown in FIGS. 12 to 16 is a side light source, and the light source may be disposed on the middle frame 710 on the side of the electronic device, for example.
  • the embodiment of the present application does not limit the number of light sources 610.
  • the number of light sources 610 may be one or more. When the number of light sources 610 is multiple, the multiple light sources 610 may be arranged in the same or different openings. In FIGS. 11 to 16, the four light sources are respectively arranged in different openings as an example for description. It should be understood that when the number of the light source 610 is one, the light source 610 may be a light strip, the light strip is disposed in an opening, and the length of the opening matches the length of the light strip.
  • the opening described in the embodiment of the present application occupies the wiring area on the circuit board.
  • the parts of the circuit board located below the non-display area of the display screen are all set as traces, and no other devices are provided.
  • An opening is provided in the wiring area of the circuit board of the embodiment of the present application. When making the circuit board, it is enough to bypass the opening, which will not affect the circuit board to realize its functions.
  • circuit board 611 of the light source 610 may also form a bending area under the non-display area 502.
  • the interface 612 on the circuit board 611 of the light source 610, the interface 5133 on the circuit board 513 of the liquid crystal panel 512, and the interface on the circuit board of the optical fingerprint module 620 can all be connected to the main board of the electronic device.
  • An embodiment of the present application also provides an electronic device 700.
  • the electronic device 700 includes:
  • the display screen 500 includes a liquid crystal panel and a backlight module, wherein the circuit board of the liquid crystal panel forms a bending area under the non-display area of the display screen, and an opening is provided in the bending area of the circuit board;
  • the light source 610 is arranged in the opening, wherein the opening forms a light channel from the light source to the fingerprint detection area in the display screen;
  • the optical fingerprint module 620 is arranged below the display screen 500 and is used to detect the light signal returned from the finger when the light source illuminates the finger above the fingerprint detection area.
  • the electronic device 700 includes the display screen 500 and the fingerprint detection device 600 in the various embodiments of the present application described above. Therefore, for the description of the display screen 500, the light source 610, and the optical fingerprint module 620, reference may be made to the aforementioned related descriptions of FIGS. For the sake of brevity, I won't repeat them here.
  • the display screen 500 may be a common non-folding display screen, or may be a foldable display screen or referred to as a flexible display screen.
  • the electronic devices in the embodiments of the present application may be portable or mobile computing devices such as terminal devices, mobile phones, tablet computers, notebook computers, desktop computers, game devices, in-vehicle electronic devices or wearable smart devices, and Electronic databases, automobiles, bank automated teller machines (Automated Teller Machine, ATM) and other electronic equipment.
  • the wearable smart device includes full-featured, large-sized, complete or partial functions that can be realized without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as various types of smart bracelets, smart jewelry and other equipment for physical sign monitoring.

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Abstract

一种指纹检测的装置（600），能够在不增加显示屏的非显示区域的面积的情况下，实现屏下光学指纹检测。所述装置应用于具有显示屏的电子设备，所述显示屏包括液晶面板和背光模组，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔，所述装置包括：光源（610），设置于所述开孔内，其中，所述开孔形成从所述光源（610）至所述显示屏内的指纹检测区域的光通道；光学指纹模组（620），设置于所述显示屏下方，用于检测所述光源（610）照射所述指纹检测区域上方的手指并从所述手指返回的光信号。

Description

指纹检测的装置、显示屏和电子设备 技术领域
本申请实施例涉及生物特征识别领域，并且更具体地，涉及一种指纹检测的装置、显示屏和电子设备。
背景技术
光学指纹模组采集显示屏上方的手指反射和透射而返回的光信号，并根据该光信号中携带的手指的指纹信息，实现屏下光学指纹检测。对于液晶显示屏(Liquid-Crystal Display，LCD)而言，需要采用背光模组提供均匀的背景光源。由于背光模组中存在反射膜而无法透过可见光。因此，为了实现屏下光学指纹检测，需要使用额外的补光光源。但是，补光光源占用了显示屏下的一部分空间，增加了显示屏的非显示区域，即“下巴”区域的宽度。
发明内容
本申请实施例提供一种指纹检测的装置、显示屏和电子设备，能够在不增加显示屏的非显示区域的面积的情况下，实现屏下光学指纹检测。
第一方面，提供了一种指纹检测的装置，应用于具有显示屏的电子设备，所述显示屏包括液晶面板和背光模组，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔，所述装置包括：
光源，设置于所述开孔内，其中，所述开孔形成从所述光源至所述显示屏内的指纹检测区域的光通道；
光学指纹模组，设置于所述显示屏下方，用于检测所述光源照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
在一种可能的实现方式中，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
在一种可能的实现方式中，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
在一种可能的实现方式中，所述光源固定于所述电子设备的侧边的中框。
在一种可能的实现方式中，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
在一种可能的实现方式中，所述光源为红外光源。
在一种可能的实现方式中，所述开孔占用所述电路板上的走线区域。
在一种可能的实现方式中，所述光源的电路板在所述非显示区域的下方形成弯折区域。
在一种可能的实现方式中，所述液晶面板的芯片采用COF或者COG的封装方式。
在一种可能的实现方式中，所述光学指纹模组设置于所述显示屏的显示区域的下方。
在一种可能的实现方式中，所述显示屏还包括玻璃盖板，所述液晶面板和所述背光模组位于所述玻璃盖板下方，所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
在一种可能的实现方式中，所述液晶面板的电路板为柔性电路板(Flexible Printed Circuit，FPC)。
第二方面，提供了一种显示屏，所述显示屏包括液晶面板和背光模组，其中，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔，以设置用于指纹检测的光源，并形成从所述光源至所述显示屏内的指纹检测区域的光通道。
在一种可能的实现方式中，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
在一种可能的实现方式中，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
在一种可能的实现方式中，所述光源固定于所述电子设备的侧边的中框。
在一种可能的实现方式中，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
在一种可能的实现方式中，所述开孔占用所述电路板上的走线区域。
在一种可能的实现方式中，所述液晶面板的芯片采用COF或者COG的封装方式。
在一种可能的实现方式中，所述显示屏还包括玻璃盖板，所述液晶面板 和所述背光模组位于所述玻璃盖板下方，所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
第三方面，提供了一种电子设备，包括：
显示屏，包括液晶面板和背光模组，其中，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔；
光源，设置于所述开孔内，其中，所述开孔形成从所述光源至所述显示屏内的指纹检测区域的光通道；
光学指纹模组，设置于所述显示屏下方，用于检测所述光源照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
在一种可能的实现方式中，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
在一种可能的实现方式中，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
在一种可能的实现方式中，所述光源固定于所述电子设备的侧边的中框。
在一种可能的实现方式中，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
在一种可能的实现方式中，所述光源为红外光源。
在一种可能的实现方式中，所述开孔占用所述电路板上的走线区域。
在一种可能的实现方式中，所述光源的电路板在所述非显示区域的下方形成弯折区域。
在一种可能的实现方式中，所述液晶面板的芯片采用COF或者COG的封装方式。
在一种可能的实现方式中，所述光学指纹模组设置于所述显示屏的显示区域的下方。
在一种可能的实现方式中，所述显示屏还包括玻璃盖板，所述液晶面板和所述背光模组位于所述玻璃盖板下方，所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
在一种可能的实现方式中，所述液晶面板的电路板为FPC。
第四方面，提供了一种电子设备，包括：
第一方面或第一方面的任意可能的实现方式中的指纹检测的装置；以及，
第二方面或第二方面的任意可能的实现方式中的显示屏。
基于上述技术方案，通过在液晶面板的电路板上制作开孔，以用于设置光源，从而可以在不增加显示屏的非显示区域的面积的情况下，使用该光源进行指纹检测。
附图说明
图1A和图是本申请可以适用的电子设备的示意图。
图1B和图2B分别是图1A和图2A所示的电子设备沿A-A’方向的剖面示意图。
图3是显示屏的示意图。
图4是背光模组的示意图。
图5是本申请实施例的显示屏的示意性框图。
图6是本申请实施例的指纹检测的装置的示意性框图。
图7是补光光源的示意图。
图8是指纹检测的示意图。
图9是补光光源导致“下巴”区域变宽的示意图。
图10是液晶面板的电路板在非显示区域下方发生弯折的示意图。
图11是本申请实施例的液晶面板的电路板上的开孔的示意图。
图12和图13是本申请实施例的液晶面板的电路板上的第一开孔和第二开孔的示意图。
图14至图16是本申请实施例的液晶面板的电路板上的第一开孔和第二开孔在直角处连通的示意图。
图17是本申请实施例的电子设备的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
应理解，本申请实施例可以应用于指纹系统，包括但不限于光学、超声波或其他指纹检测系统和基于光学、超声波或其他指纹成像的医疗诊断产品，本申请实施例仅以光学指纹系统为例进行说明，但不应对本申请实施例构成任何限定，本申请实施例同样适用于其他采用光学、超声波或其他成像技术 的系统等。
作为一种常见的应用场景，本申请实施例提供的光学指纹系统可以应用在智能手机、平板电脑以及其他具有显示屏的移动终端或者其他电子设备；更具体地，在上述电子设备中，光学指纹模组可以设置在显示屏下方的局部区域或者全部区域，从而形成屏下(Under-display或Under-screen)光学指纹系统。或者，所述光学指纹模组也可以部分或者全部集成至所述电子设备的显示屏内部，从而形成屏内(In-display或In-screen)光学指纹系统。
屏下光学指纹检测技术使用从设备显示组件的顶面返回的光线来进行指纹感应和其他感应操作。所述返回的光线携带与该顶面接触的物体，例如手指的信息，通过采集和检测该手指返回的光，实现位于显示屏下方的特定光学传感器模块的光学指纹检测。光学传感器模块的设计可以为通过恰当地配置用于采集和检测返回的光的光学元件来实现期望的光学成像。
图1A和图2A示出了本申请实施例可以适用的电子设备的示意图。其中，图1A和图2A为电子设备10的定向示意图，图1B和图2B分别为图1A和图2A所示的电子设备10沿A-A’方向的部分剖面示意图。
所述电子设备10包括显示屏120和光学指纹模组130。其中，所述光学指纹模组130设置在所述显示屏120下方的局部区域。所述光学指纹模组130包括光学指纹传感器，所述光学指纹传感器包括具有多个光学感应单元131(也称为像素、感光像素、像素单元等)的感应阵列133。所述感应阵列133所在区域或者其感应区域为所述光学指纹模组130的指纹检测区域103。如图1A所示，所述指纹检测区域103位于所述显示屏120的显示区域之中。在一种替代的实现方式中，所述光学指纹模组130设置在其他位置，比如设置在所述显示屏120的侧面或者所述电子设备10的边缘非透光区域，并通过光路设计来将来自所述显示屏120的至少部分显示区域的光信号导引到所述光学指纹模组130，从而使得所述指纹检测区域103实际上位于所述显示屏120的显示区域。
应理解，所述指纹检测区域103的面积可以与所述光学指纹模组130的感应阵列133的面积不同，例如通过透镜成像的光路设计、反射式折叠光路设计或者其他光线会聚或者反射等光路设计，使得所述光学指纹模组130的指纹检测区域103的面积大于所述光学指纹模组130的感应阵列133的面积。在其他替代的实现方式中，如果采用例如光线准直的方式进行光路引导，所 述光学指纹模组130的指纹检测区域103也可以设计成与所述光学指纹模组130的感应阵列133的面积基本一致。
因此，用户在需要对所述电子设备10进行解锁或者其他指纹验证的时候，只需要将手指按压在位于所述显示屏120的指纹检测区域103，便可以实现指纹输入。由于指纹检测可以在屏内实现，因此采用上述结构的电子设备10无需其正面专门预留空间来设置指纹按键(比如Home键)，从而可以采用全面屏方案，即所述显示屏120的显示区域可以基本扩展到整个电子设备10的正面。
作为一种实现方式，如图1B所示，所述光学指纹模组130包括光检测部分134和光学组件132。所述光检测部分134包括所述感应阵列133以及与所述感应阵列133电性连接的读取电路及其他辅助电路，其可以通过半导体工艺制作在一个芯片(Die)上，形成光学指纹传感器(也称为光学指纹芯片、传感器、传感器芯片、芯片等)。所述感应阵列133具体为光探测器(Photodetector)阵列，其包括多个呈阵列式分布的光探测器，所述光探测器可以作为如上所述的光学感应单元。所述光学组件132可以设置在所述光检测部分134的感应阵列133的上方，其具体可以包括滤光层(Filter)、导光层或光路引导结构、以及其他光学元件，所述滤光层可以用于滤除穿透手指的环境光，而所述导光层主要用于从手指表面反射回来的反射光导引至所述感应阵列133进行指纹检测。
在具体实现上，所述光学组件132可以与所述光检测部分134封装在同一个光学指纹部件。例如，所述光学组件132可以与所述光学检测部分134封装在同一个光学指纹芯片，也可以将所述光学组件132设置在所述光检测部分134所在的芯片外部，比如将所述光学组件132贴合在所述芯片上方，或者将所述光学组件132的部分元件集成在上述芯片之中。
其中，所述光学组件132的导光层有多种实现方案。例如，所述导光层可以具体为在半导体硅片制作而成的准直器(Collimator)层，其具有多个准直单元或者微孔阵列，所述准直单元可以具体为小孔，从手指反射回来的反射光中，垂直入射到所述准直单元的光线可以穿过并被其下方的光学感应单元接收，而入射角度过大的光线在所述准直单元内部经过多次反射被衰减掉，因此每一个光学感应单元基本只能接收到其正上方的指纹纹路反射回来的反射光，从而所述感应阵列133便可以检测出手指的指纹图像。
在另一种实现方式中，所述导光层也可以为光学透镜(Lens)层，其具有一个或多个透镜单元，例如由一个或多个非球面透镜组成的透镜组，其用于将从手指反射回来的反射光会聚到其下方的光检测部分134的感应阵列133，使得所述感应阵列133可以基于所述反射光进行成像，从而得到所述手指的指纹图像。可选地，所述光学透镜层在所述透镜单元的光路中还可以形成有针孔，所述针孔可以配合所述光学透镜层扩大所述光学指纹模组130的视场，以提高所述光学指纹模组130的指纹成像效果。
在其他实现方式中，所述导光层也可以具体采用微透镜(Micro-Lens)层，所述微透镜层具有由多个微透镜形成的微透镜阵列，其可以通过半导体生长工艺或者其他工艺形成在所述光检测部分134的感应阵列133上方，并且每一个微透镜可以分别对应于所述感应阵列133的其中一个感应单元。所述微透镜层和所述感应单元之间还可以形成其他光学膜层，比如介质层或者钝化层。进一步地，所述微透镜层和所述感应单元之间还可以包括具有微孔的挡光层(也称为遮光层、阻光层等)，其中所述微孔形成在其对应的微透镜和感应单元之间，所述挡光层可以阻挡相邻微透镜和感应单元之间的光学干扰，并使得所述感应单元所对应的光线通过所述微透镜会聚到所述微孔内部，并经由所述微孔传输到所述感应单元以进行光学指纹成像。
应理解，上述导光层的几种实现方案可以单独使用也可以结合使用。例如，可以在所述准直器层或者所述光学透镜层的上方或下方进一步设置微透镜层。当然，在所述准直器层或者所述光学透镜层与所述微透镜层结合使用时，其具体叠层结构或者光路可能需要按照实际需要进行调整。
作为一种实现方式，所述显示屏120可以采用具有自发光显示单元的显示屏，比如有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。以采用OLED显示屏为例，所述光学指纹模组130可以利用所述OLED显示屏120位于所述指纹检测区域103的显示单元(即OLED光源)作为光学指纹检测的激励光源。当手指140按压在所述指纹检测区域103时，所述显示屏120向所述指纹检测区域103上方的手指140发出一束光111，光111在手指140的表面发生反射形成反射光或者经过所述手指140内部散射而形成散射光。在相关专利申请中，为便于描述，也将上述反射光和散射光统称为反射光。由于指纹的脊(ridge)141与谷(valley)142对于光的反射能力不同，因此，来自指纹脊的反射光 151和来自指纹谷的反射光152具有不同的光强，反射光经过光学组件132后，被所述光学指纹模组130中的感应阵列133接收并转换为相应的电信号，即指纹检测信号。基于所述指纹检测信号便可以获得指纹图像数据，并进一步进行指纹匹配验证，从而在所述电子设备10中实现光学指纹检测功能。
在其他实现方式中，所述光学指纹模组130也可以采用内置光源或者外置光源来提供用于进行指纹检测的光信号。在这种情况下，所述光学指纹模组130可以适用于非自发光显示屏，比如液晶显示屏或者其他的被动发光显示屏。以应用在具有背光模组和液晶面板的液晶显示屏为例，为支持液晶显示屏的屏下指纹检测，所述电子设备10的光学指纹系统还可以包括用于光学指纹检测的激励光源，所述激励光源可以具体为红外光源或者特定波长非可见光的光源，其可以设置在所述液晶显示屏的背光模组下方或者设置在所述电子设备10的保护盖板下方的边缘区域，而所述光学指纹模组130可以设置液晶面板或者保护盖板的边缘区域下方并通过光路引导以使得指纹检测光可以到达所述光学指纹模组130；或者，所述光学指纹模组130也可以设置在所述背光模组下方，且所述背光模组通过对扩散片、增亮片、反射片等膜层进行开孔或者其他光学设计以允许指纹检测光穿过液晶面板和背光模组并到达所述光学指纹模组130。当采用所述光学指纹模组130采用内置光源或者外置光源来提供用于进行指纹检测的光信号时，其检测原理与上面描述内容是一致的。
应理解，在具体实现上，所述电子设备10还可以包括透明保护盖板，所述盖板可以为玻璃盖板或者蓝宝石盖板，其位于所述显示屏120的上方并覆盖所述电子设备10的正面。因此，本申请实施例中，所谓的手指按压在所述显示屏120实际上是指按压在所述显示屏120上方的盖板或者覆盖所述盖板的保护层表面。
所述电子设备10还可以包括电路板150，电路板150设置在所述光学指纹模组130的下方。光学指纹模组130可以通过背胶粘接在电路板150上，并通过焊盘及金属线焊接与电路板150实现电性连接。光学指纹模组130可以通过电路板150实现与其他外围电路或者电子设备10的其他元件的电性互连和信号传输。例如，光学指纹模组130可以通过电路板150接收电子设备10的处理单元的控制信号，并且还可以通过电路板150将来自光学指纹模组130的指纹检测信号输出给终端设备10的处理单元或者控制单元等。
在某些实现方式中，所述光学指纹模组130可以仅包括一个光学指纹传感器，此时光学指纹模组130的指纹检测区域103的面积较小且位置固定，因此用户在进行指纹输入时需要将手指按压到所述指纹检测区域103的特定位置，否则光学指纹模组130可能无法采集到指纹图像而造成用户体验不佳。在其他替代实施例中，所述光学指纹模组130可以包括多个光学指纹传感器。所述多个光学指纹传感器可以通过拼接的方式并排设置在所述显示屏120的下方，且所述多个光学指纹传感器的感应区域共同构成所述光学指纹模组130的指纹检测区域103。从而所述光学指纹模组130的指纹检测区域103可以扩展到所述显示屏的下半部分的主要区域，即扩展到手指惯常按压区域，从而实现盲按式指纹输入操作。进一步地，当所述光学指纹传感器数量足够时，所述指纹检测区域103还可以扩展到半个显示区域甚至整个显示区域，从而实现半屏或者全屏指纹检测。
例如图2A和图2B所示的电子设备10，所述电子设备10中的光学指纹模组130包括多个光学指纹传感器，所述多个光学指纹传感器可以通过例如拼接等方式并排设置在所述显示屏120的下方，且所述多个光学指纹传感器的感应区域共同构成所述光学指纹模组130的指纹检测区域103。
在一种实现方式中，与所述光学指纹模组130的多个光学指纹传感器相对应，所述光学组件132中可以包括多个导光层，每个导光层分别对应一个光学指纹传感器，并分别贴合设置在其对应的光学指纹传感器的上方。或者，所述多个光学指纹传感器也可以共享一个整体的导光层，即所述导光层具有一个足够大的面积以覆盖所述多个光学指纹传感器的感应阵列。
另外，所述光学组件132还可以包括其他光学元件，比如滤光层(Filter)或其他光学膜片，其可以设置在所述导光层和所述光学指纹传感器之间，或者设置在所述显示屏120与所述导光层之间，主要用于隔离外界干扰光对光学指纹检测的影响。其中，所述滤光层可以用于滤除穿透手指并经过所述显示屏120进入所述光学指纹传感器的环境光。与所述导光层相类似，所述滤光层可以针对每个光学指纹传感器分别设置以滤除干扰光，或者也可以采用一个大面积的滤光片同时覆盖所述多个光学指纹传感器。
所述导光层也可以采用光学镜头(Lens)来代替，所述光学镜头上方可以通过遮光材料形成小孔配合所述光学镜头将指纹检测光会聚到下方的光学指纹传感器以实现指纹成像。类似地，每一个光学指纹传感器可以分别配 置一个光学镜头以进行指纹成像，或者，所述多个光学指纹传感器也可以利用同一个光学镜头来实现光线会聚和指纹成像。在其他替代实施例中，每一个光学指纹传感器甚至还可以具有两个感应阵列(Dual Array)或者多个感应阵列(Multi-Array)，且同时配置两个或多个光学镜头配合所述两个或多个感应阵列进行光学成像，从而减小成像距离并增强成像效果。
本申请实施例中的指纹检测方案可以适用于非自发光显示屏，例如液晶显示屏。如图3所示，显示屏500包括液晶层510和位于液晶层510下方的背光模组520。其中，如图4所示，液晶层510包括盖板玻璃511和液晶面板512。背光模组520包括依次包括增亮膜521、匀光膜522、导光板523、反射膜524和补强钢板525。其中，反射膜524无法透过可见光，所以需要使用额外的补光光源用来进行指纹检测。但是，该补光光源占用了显示屏下方的一部分空间，增加了显示屏的非显示区域的宽度。因此，显示屏内的显示区域的面积就会减小，降低了电子设备的屏占比。以下，所述的光源均指该补光光源。
本申请实施例中，通过在非显示区域下方的液晶面板的电路板上制作开孔，以用于设置光源，从而可以在不增加显示屏的非显示区域的面积的情况下，使用该光源进行指纹检测。
图5是本申请实施例的显示屏500的示意性框图。如图5所示，所述显示屏500包括液晶面板512和背光模组520。其中，所述液晶面板512的电路板513在所述显示屏500的非显示区域下方形成弯折区域，所述电路板513的弯折区域内设置有开孔，以设置用于指纹检测的光源610，并形成从所述光源610至所述显示屏500内的指纹检测区域的光通道。
图6是本申请实施例的指纹检测的装置600的示意性框图。所述装置600应用于具有显示屏500的电子设备。如图6所示，所述装置600包括：
光源610，设置于所述开孔内；
光学指纹模组620，设置于所述显示屏500下方，用于检测所述光源610照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
本申请实施例中，通过在非显示区域下方的液晶面板的电路板上制作开孔，以用于设置光源，从而可以在不增加显示屏的非显示区域的面积的情况下，使用该光源进行指纹检测。
所述显示屏500还可以包括玻璃盖板511，所述液晶面板512和所述背 光模组520位于所述玻璃盖板511下方。所述液晶面板512和所述背光模组520所在的区域形成所述显示屏500的显示区域。
图7和图8分别为电子设备的俯视图和侧视图。其中，指纹检测区域5011位于图7中所示的显示屏500的显示区域501内，显示屏500的非显示区域502也称为电子设备的“下巴”区域，用于指纹检测的光源610位于非显示区域502的下方。
如图8所示，玻璃盖板511下方依次为液晶面板512和背光模组520。其中，液晶面板512和背光模组520所在的区域形成显示屏500的显示区域501。显示屏500的非显示区域502下方的空间可用于容纳液晶面板512的电路板513以及光源610。光源610发出的光信号照射至指纹检测区域5011上方的手指，并经该手指的反射和散射而返回至背光模组520下方的光学指纹模组620。该光信号中携带该手指的指纹信息。光学指纹模组620接收该光信号，以用于指纹检测。
光学指纹模组620可以设置在显示屏500的显示区域501下方，也可以设置在其非显示区域502下方。图8中仅以光学指纹模组620设置在背光模组520下方为例进行描述。
光源610例如可以为红外光源。这样，手指返回的光信号就能够穿过背光模组520而达到光学指纹模组620。
应理解，光学指纹模组620例如可以是前述图1B和图2B中所示的光学指纹模组130，相关特征可以参考针对光学指纹模组130的描述，为了简洁，这里不再赘述。
液晶面板512的电路板513例如可以是FPC。液晶面板512的芯片例如可以采用FPC承载芯片(Chip On FPC，COF)的封装方式；或者采用玻璃承载芯片(Chip On Glass，COG)的封装方式。采用COF的封装方式时，可以将液晶面板512的芯片固定在液晶面板512的FPC上。采用COG的封装方式时，可以将液晶面板512的芯片固定在玻璃盖板511上，然后再引出至FPC。无论采用上述那种封装方式，液晶面板512的电路板513在显示屏500的非显示区域502下方都会形成弯折区域。
如图9所示，光源610及其电路板611设置于非显示区域502的下方，且通过双面胶612粘贴在电子设备的侧边的中框710上。可以看出，为了设置光源610，非显示区域502的宽度需要增加W，W通常大于0.7mm。相应 地，这就减小了显示区域501的宽度，影响了用户体验。
图10示出了液晶面板512的电路板513的弯折区域5131。如图10所示，电路板513在显示屏500的非显示区域502下方发生弯折，形成弯折区域5131。弯折后的电路板513通过其接口5133连接至电子设备的主板720。通常，电路板513进行弯折需要预留足够的空间区域，例如0.7mm至0.8mm。并且，电路板513与侧边的中框710之间还要预留一定的安全距离，例如0.3mm左右。
为了进行指纹检测，需要在非显示区域502下方增设光源610。本申请实施例中，在非显示区域502下方的电路板513的弯折区域5131内设置开孔，以用于容纳光源610。并且，所述开孔能够形成从光源610至显示屏500内的指纹检测区域5011的光通道。
本申请实施例对所述开孔的位置不做限定，所述开孔内能够用于设置光源610并且能够形成从光源610至指纹检测区域5011的光通道即可。
图11所示为电子设备的俯视图。其中，液晶面板512的电路板513在显示屏的“下巴”区域的下方发生弯折并形成弯折区域5131。电路板513的弯折区域5131内设置有开孔5132，开孔5132用于设置光源610。光源610发出的光线应当能够通过开孔5132传输至指纹检测区域5011，从而用于指纹检测。
在一种实现方式中，开孔5132可以包括第一开孔5132A和第二开孔5132B。其中，第一开孔5132A位于弯折区域5131中垂直于显示屏的部分，第二开孔5132B位于弯折区域5131中靠近且平行于显示屏的部分。
如图12和图13所示，液晶面板512的电路板513的弯折区域5131包括垂直于显示屏的部分，以及平行于显示屏的部分。弯折区域5131上设置的开孔5132包括第一开孔5132A和第二开孔5132B。其中，第一开孔5132A位于弯折区域5131中垂直于显示屏的区域，第二开孔5132B位于弯折区域5131中平行且靠近显示屏的区域。光源610设置于第一开孔5132A内。并且，如图13所示，由于第二开孔5132B能够与第一开孔5132A之间形成从光源610至指纹检测区域5011的光通道，因此光源610发出的光线可以经过该光通道传输至指纹检测区域5011上方的手指。该手指返回的光线被光学指纹模组620采集，从而用于指纹检测。
图12和图13中示出了4个第一开孔5132A，以分别用于设置4个光源 610，并示出了相对应的4个第二开孔5132B，但本申请并不限于此。第一开孔5132A的数量可以为多个，分别用于设置多个光源610；第一开孔5132A的数量也可以为一个，从而多个光源610设置于同一开孔中。第二开孔5132B的数量可以为一个或者多个，只要能够与第一开孔5132A之间形成光源610至指纹检测区域的光通道即可。并且，第一开孔5132A和第二开孔5132B的数量可以相等也可以不相等。
进一步地，在另一种实现方式中，第一开孔5132A和第二开孔5132B在弯折区域5131的靠近显示屏一侧的直角处连通。
例如，如图14至图16所示，其中图16为俯视图。在液晶面板512的电路板513的弯折区域5131中，垂直和平行于显示屏的两个面之间形成直角。开孔5132位于靠近显示屏一侧的该直角处，也即，图12和图13中的第一开孔5132A和第二开孔5132B在该直角处连通。或者说，在弯折区域5131的该直角处挖孔，形成开孔5132。这样，光源610设置在该直角处的开孔5132内，其发出的光线能够直接照射至指纹检测区域5011上方的手指。图14至图16中以4个光源610为例，分别设置在4个开孔5132内。
图12至图16所示的光源为侧边光源，该光源例如可以设置在电子设备的侧边的中框710上。
本申请实施例对光源610的数量不做限定。光源610的数量可以为一个也可以为多个。当光源610的数量为多个时，这多个光源610可以设置于相同或者不同的开孔内。图11至图16中是以4个光源分别设置于不同的开孔内为例进行描述。应理解，当光源610的数量为一个时，该光源610可以为一条灯带，该灯带设置于一个开孔内，该开孔的长度与该灯带的长度相匹配。
为了不影响电路板上的其他器件的功能，本申请实施例中所述的开孔占用所述电路板上的走线区域。通常，电路板中位于显示屏的非显示区域下方的部分均设置为走线，而不设置其他器件。本申请实施例电路板的该走线区域内设置开孔。在制作电路板时，将走线绕过该开孔即可，不会影响电路板实现其功能。
另外，光源610的电路板611在非显示区域502的下方也可以形成弯折区域。光源610的电路板611上的接口612、液晶面板512的电路板513上的接口5133、以及光学指纹模组620的电路板上的接口，均可以连接至电子设备的主板。
本申请实施例还提供了一种电子设备700，如图17所示，所述电子设备700包括：
显示屏500，包括液晶面板和背光模组，其中，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔；
光源610，设置于所述开孔内，其中，所述开孔形成从所述光源至所述显示屏内的指纹检测区域的光通道；以及，
光学指纹模组620，设置于所述显示屏500下方，用于检测所述光源照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
应理解，所述电子设备700包括上述本申请各种实施例中的显示屏500以及指纹检测的装置600。因此，显示屏500、光源610以及光学指纹模组620的描述均可以参考前述针对图3至图16的相关描述。为了简洁，这里不再赘述。
所述显示屏500可以为普通的非折叠显示屏，也可以为可折叠显示屏或称为柔性显示屏。
作为示例而非限定，本申请实施例中的电子设备可以为终端设备、手机、平板电脑、笔记本电脑、台式机电脑、游戏设备、车载电子设备或穿戴式智能设备等便携式或移动计算设备，以及电子数据库、汽车、银行自动柜员机(Automated Teller Machine，ATM)等其他电子设备。该穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等设备。
需要说明的是，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形均落在本申请的保护范围内。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易 想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (33)

  1. 一种指纹检测的装置，其特征在于，应用于具有显示屏的电子设备，所述显示屏包括液晶面板和背光模组，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔，所述装置包括：
    光源，设置于所述开孔内，其中，所述开孔形成从所述光源至所述显示屏内的指纹检测区域的光通道；
    光学指纹模组，设置于所述显示屏下方，用于检测所述光源照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
  2. 根据权利要求1所述的装置，其特征在于，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
  3. 根据权利要求2所述的装置，其特征在于，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
  4. 根据权利要求1至3中任一项所述的装置，其特征在于，所述光源固定于所述电子设备的侧边的中框上。
  5. 根据权利要求1至4中任一项所述的装置，其特征在于，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
  6. 根据权利要求1至5中任一项所述的装置，其特征在于，所述光源为红外光源。
  7. 根据权利要求1至6中任一项所述的装置，其特征在于，所述开孔占用所述电路板上的走线区域。
  8. 根据权利要求1至7中任一项所述的装置，其特征在于，所述光源的电路板在所述非显示区域的下方形成弯折区域。
  9. 根据权利要求1至8中任一项所述的装置，其特征在于，所述液晶面板的芯片采用电路板承载芯片COF或者玻璃承载芯片COG的封装方式。
  10. 根据权利要求1至9中任一项所述的装置，其特征在于，所述光学指纹模组设置于所述显示屏的显示区域的下方。
  11. 根据权利要求1至10中任一项所述的装置，其特征在于，所述显示屏还包括玻璃盖板，所述液晶面板和所述背光模组位于所述玻璃盖板下方， 所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
  12. 根据权利要求1至11中任一项所述的装置，其特征在于，所述液晶面板的电路板为柔性电路板FPC。
  13. 一种显示屏，其特征在于，所述显示屏包括液晶面板和背光模组，其中，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔，以设置用于指纹检测的光源，并形成从所述光源至所述显示屏内的指纹检测区域的光通道。
  14. 根据权利要求13所述的显示屏，其特征在于，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
  15. 根据权利要求14所述的显示屏，其特征在于，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
  16. 根据权利要求13至15中任一项所述的显示屏，其特征在于，所述光源固定于所述电子设备的侧边的中框上。
  17. 根据权利要求13至16中任一项所述的显示屏，其特征在于，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
  18. 根据权利要求13至17中任一项所述的显示屏，其特征在于，所述开孔占用所述电路板上的走线区域。
  19. 根据权利要求13至18中任一项所述的显示屏，其特征在于，所述液晶面板的芯片采用电路板承载芯片COF或者玻璃承载芯片COG的封装方式。
  20. 根据权利要求13至19中任一项所述的显示屏，其特征在于，所述显示屏还包括玻璃盖板，所述液晶面板和所述背光模组位于所述玻璃盖板下方，所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
  21. 一种电子设备，其特征在于，包括：
    显示屏，包括液晶面板和背光模组，其中，所述液晶面板的电路板在所述显示屏的非显示区域下方形成弯折区域，所述电路板的弯折区域内设置有开孔；
    光源，设置于所述开孔内，其中，所述开孔形成从所述光源至所述显示屏内的指纹检测区域的光通道；以及，
    光学指纹模组，设置于所述显示屏下方，用于检测所述光源照射所述指纹检测区域上方的手指并从所述手指返回的光信号。
  22. 根据权利要求21所述的电子设备，其特征在于，所述开孔包括第一开孔和第二开孔，所述第一开孔位于所述弯折区域中垂直于所述显示屏的部分，所述第二开孔位于所述弯折区域中靠近所述显示屏一侧的平行于所述显示屏的部分。
  23. 根据权利要求22所述的电子设备，其特征在于，所述第一开孔和所述第二开孔在所述弯折区域的靠近所述显示屏一侧的直角处连通。
  24. 根据权利要求21至23中任一项所述的电子设备，其特征在于，所述光源固定于所述电子设备的侧边的中框上。
  25. 根据权利要求21至24中任一项所述的电子设备，其特征在于，所述光源的数量为多个，所述多个光源设置于相同或者不同的开孔内。
  26. 根据权利要求21至25中任一项所述的电子设备，其特征在于，所述光源为红外光源。
  27. 根据权利要求21至26中任一项所述的电子设备，其特征在于，所述开孔占用所述电路板上的走线区域。
  28. 根据权利要求21至27中任一项所述的电子设备，其特征在于，所述光源的电路板在所述非显示区域的下方形成弯折区域。
  29. 根据权利要求21至28中任一项所述的电子设备，其特征在于，所述液晶面板的芯片采用电路板承载芯片COF或者玻璃承载芯片COG的封装方式。
  30. 根据权利要求21至29中任一项所述的电子设备，其特征在于，所述光学指纹模组设置于所述显示屏的显示区域的下方。
  31. 根据权利要求21至30中任一项所述的电子设备，其特征在于，所述显示屏还包括玻璃盖板，所述液晶面板和所述背光模组位于所述玻璃盖板下方，所述液晶面板和所述背光模组所在的区域形成所述显示屏的显示区域。
  32. 根据权利要求21至31中任一项所述的电子设备，其特征在于，所述液晶面板的电路板为柔性电路板FPC。
  33. 一种电子设备，其特征在于，包括：
    根据权利要求1至12中任一项所述的指纹检测的装置；以及，
    根据权利要求13至20中任一项所述的显示屏。
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