CN110799990B - Fingerprint identification device and electronic equipment - Google Patents
Fingerprint identification device and electronic equipment Download PDFInfo
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- CN110799990B CN110799990B CN201980003076.0A CN201980003076A CN110799990B CN 110799990 B CN110799990 B CN 110799990B CN 201980003076 A CN201980003076 A CN 201980003076A CN 110799990 B CN110799990 B CN 110799990B
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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
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Image Input (AREA)
Abstract
A fingerprint identification device and electronic equipment are applied to the electronic equipment with a flexible display screen, and can realize the under-screen fingerprint identification of the flexible display screen. The device comprises: the optical fingerprint module is used for being arranged below the fingerprint detection area so as to collect light signals reflected by fingers above the fingerprint detection area; and the support piece is used for being arranged between the flexible display screen and the optical fingerprint module and used for supporting the part of the flexible display screen in the fingerprint detection area, wherein the support piece is fixed on the lower surface of the flexible display screen.
Description
Technical Field
The embodiment of the application relates to the field of biological feature recognition, and more particularly relates to a fingerprint recognition device and electronic equipment.
Background
The technology for identifying the fingerprints under the optical screen is that the optical fingerprint module collects reflected light formed by the reflection of light rays emitted by the light source on the fingers, and fingerprint information of the fingers is carried in the reflected light, so that the fingerprint identification under the screen is realized. For the foldable mobile phone and the like adopting the flexible display screen, when the finger presses the flexible display screen to carry out fingerprint identification, the material of the fingerprint identification display screen is soft, so that the depression can occur in the pressing area of the finger, the user experience is influenced, the fingerprint identification performance of the optical fingerprint module is also influenced, and even the flexible display screen and the optical fingerprint module can be damaged.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device, a fingerprint identification method and electronic equipment, which can realize the under-screen fingerprint identification of a flexible display screen.
In a first aspect, a fingerprint recognition device is provided, for application to an electronic apparatus having a flexible display screen, the device comprising:
the optical fingerprint module is used for being arranged below the fingerprint detection area so as to collect light signals reflected by fingers above the fingerprint detection area; the method comprises the steps of,
the support piece is used for being arranged between the flexible display screen and the optical fingerprint module and used for supporting the part of the flexible display screen in the fingerprint detection area, wherein the support piece is fixed on the lower surface of the flexible display screen.
In one possible implementation, the support member is adhered to a lower surface of the flexible display screen.
In one possible implementation, the adhesive material between the support and the flexible display screen is an optically clear adhesive OCA.
In one possible implementation manner, the middle frame of the electronic device is fixed on the lower surface of the support, and the optical fingerprint module is fixed on the middle frame.
In one possible implementation, the middle frame is adhered to the lower surface of the support member.
In one possible implementation, the adhesive material between the middle frame and the support is OCA.
In one possible implementation manner, a step structure is arranged on one side, close to the lower surface, of the light-transmitting window of the middle frame, and the edge of the optical fingerprint module is fixed on the step structure.
In one possible implementation, the support and/or the outer ring portion of the middle frame are reinforced with glue.
In one possible implementation, the optical fingerprint module is fixed on the lower surface of the support.
In one possible implementation manner, the support member is provided with a groove with a downward opening, and the optical fingerprint module is at least partially arranged in the groove of the support member.
In one possible implementation, the optical fingerprint module is fixed to the lower surface of the support member by a flexible circuit board of the optical fingerprint module.
In one possible implementation, the outer ring portion of the optical fingerprint module is reinforced with glue to the support.
In one possible implementation, the area of the support is equal to or greater than the area of the fingerprint detection area.
In one possible implementation, the support is made of optical glass or resin.
In one possible implementation, the support has a thickness of 0.1 to 0.8 mm.
In one possible implementation, the support member is fixed on the lower surface of the foam layer of the flexible display screen, or the support member is at least partially disposed in the light-transmitting window of the foam layer.
In one possible implementation, the optical fingerprint module includes one optical fingerprint sensor chip, or includes a plurality of optical fingerprint sensor chips that are spliced together.
In one possible implementation, the distance between the optical fingerprint sensor chip in the optical fingerprint module and the light emitting layer of the flexible display screen is 150 to 300 micrometers.
In a second aspect, a terminal device is provided, comprising a flexible display screen and the apparatus for fingerprint identification in the first aspect or any possible implementation manner of the first aspect.
In one possible implementation, the electronic device further includes a middle frame.
Based on the technical scheme, because the transparent support piece is arranged between the flexible display screen and the optical fingerprint module, when a finger is pressed in the fingerprint detection area to carry out fingerprint identification, the part of the flexible display screen, which is positioned in the fingerprint detection area, can not be sunk due to the blocking of the transparent support piece, so that the user experience is improved, the influence on the fingerprint identification performance of the optical fingerprint module is avoided, and meanwhile, the damage to the flexible display screen and the optical fingerprint module is reduced.
Drawings
Fig. 1 is a schematic diagram of an electronic device to which the present application can be applied.
Fig. 2 is a schematic cross-sectional view of the electronic device shown in fig. 1 along A-A'.
Fig. 3 is a schematic block diagram of an apparatus 300 for fingerprint identification in accordance with an embodiment of the present application.
Fig. 4 is a schematic view of the support having an area equal to the fingerprint detection area.
Fig. 5 is a schematic view of the support having an area larger than the fingerprint detection area.
Fig. 6 is a schematic block diagram of a possible fingerprint recognition apparatus according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of a possible fingerprint recognition apparatus according to an embodiment of the present application.
Fig. 8 is a schematic block diagram of a possible fingerprint recognition apparatus according to an embodiment of the present application.
Fig. 9 is a schematic block diagram of a possible fingerprint recognition apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be understood that the embodiments of the present application may be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example in terms of optical fingerprint systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, etc.
As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens; more specifically, in the above terminal device, the optical fingerprint module may be specifically an optical fingerprint module, which may be disposed in a partial area or an entire area Under the display screen, thereby forming an Under-screen (Under-display or Under-screen) optical fingerprint system. Alternatively, the optical fingerprint module may be partially or fully integrated into the display screen of the terminal device, so as to form an In-screen (In-display or In-screen) optical fingerprint system.
Fig. 1 and 2 show schematic diagrams of electronic devices to which embodiments of the present application may be applied. Fig. 1 is a schematic diagram of an electronic device 10, and fig. 2 is a schematic partial cross-sectional view of the electronic device 10 shown in fig. 1 along A-A'.
The terminal device 10 includes a display 120 and an optical fingerprint module 130. The optical fingerprint module 130 is disposed in a local area below the display screen 120. The optical fingerprint module 130 includes an optical fingerprint sensor including a sensing array 133 having a plurality of optical sensing units 131. The sensing area of the sensing array 133 or the sensing area thereof is the fingerprint detection area 121 (may also be referred to as a fingerprint detection area, a fingerprint identification area, etc.) of the optical fingerprint module 130. As shown in fig. 1, the fingerprint detection area 121 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 may be further disposed at other locations, such as a side of the display screen 120 or an edge non-transparent area of the terminal device 10, and the optical signal from at least a portion of the display area of the display screen 120 is guided to the optical fingerprint module 130 through an optical path design, so that the fingerprint detection area 121 is actually located in the display area of the display screen 120.
It should be appreciated that the area of the fingerprint detection area 121 may be different from the area of the sensing array 133 of the optical fingerprint module 130, for example, by a light path design such as lens imaging, a reflective folded light path design, or other light path designs such as light converging or reflecting, the area of the fingerprint detection area 121 of the optical fingerprint module 130 may be made larger than the area of the sensing array 133 of the optical fingerprint module 130. In other alternative implementations, if the light path is guided, for example, by light collimation, the fingerprint detection area 121 of the optical fingerprint module 130 may be designed to substantially coincide with the area of the sensing array of the optical fingerprint module 130.
Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, the user only needs to press the finger against the fingerprint detection area 121 located on the display screen 120, so as to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a comprehensive screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded to the front surface of the whole terminal device 10.
As an alternative implementation, as shown in fig. 1, the optical fingerprint module 130 includes a light detecting portion 134 and an optical component 132. The light detecting part 134 includes the sensing array 133 and a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor by a semiconductor process. The sensing array 133 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, which may be used as an optical sensing unit as described above. The optical component 132 may be disposed above the sensing array 133 of the light detecting portion 134, and may specifically include a Filter layer (Filter), a light guiding layer or a light path guiding structure, and other optical elements, where the Filter layer may be used to Filter out ambient light penetrating the finger, and the light guiding layer or the light path guiding structure is mainly used to guide reflected light reflected from the finger surface to the sensing array 133 for optical detection.
In particular implementations, the optical assembly 132 may be packaged in the same optical fingerprint component as the light detection section 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detecting portion 134, or the optical component 132 may be disposed outside the chip in which the optical detecting portion 134 is located, for example, the optical component 132 is attached to the chip, or some of the components of the optical component 132 are integrated in the chip.
The light guiding layer or the light path guiding structure of the optical component 132 may have various implementations, for example, the light guiding layer may be a Collimator (Collimator) layer made of a semiconductor silicon wafer, which has a plurality of collimating units or a micropore array, the collimating units may be small holes, the light vertically incident to the collimating units from the reflected light reflected by the finger may pass through and be received by the optical sensing units below the collimating units, and the light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so each optical sensing unit basically only receives the reflected light reflected by the fingerprint lines right above the optical sensing units, and the sensing array 133 may detect the fingerprint image of the finger.
In another embodiment, the light guiding layer or the light path guiding structure may also be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group consisting of one or more aspheric lenses, for converging the reflected light reflected from the finger to the sensing array 133 of the light detecting part 134 thereunder, so that the sensing array 133 may image based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole 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, so as to improve the fingerprint imaging effect of the optical fingerprint module 130.
In other embodiments, the light guiding layer or the light path guiding structure may also specifically employ a Micro-Lens layer having a Micro Lens array formed of a plurality of Micro lenses, which may be formed over the sensing array 133 of the light sensing part 134 by a semiconductor growth process or other processes, and each Micro Lens may correspond to one of sensing units of the sensing array 133, respectively. And, other optical film layers, such as a dielectric layer or a passivation layer, can be formed between the microlens layer and the sensing unit. More specifically, a light blocking layer (or referred to as a light blocking layer) having micro holes may be further included between the micro lens layer and the sensing unit, wherein the micro holes are formed between their corresponding micro lenses and the sensing unit, and the light blocking layer may block optical interference between adjacent micro lenses and the sensing unit, and allow light corresponding to the sensing unit to be converged into the micro holes through the micro lenses and transmitted to the sensing unit via the micro holes for optical fingerprint imaging.
It should be appreciated that several implementations of the light guiding layer or light path guiding structure described above may be used alone or in combination. For example, a microlens layer may be further provided above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific laminated structure or the optical path thereof may need to be adjusted according to actual needs.
As an alternative embodiment, the display 120 may be a display having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display or a Micro-LED (Micro-LED) display. Taking an OLED display as an example, the optical fingerprint module 130 may use a display unit (i.e., an OLED light source) of the OLED display 120 located in the fingerprint detection area 121 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 121, the display 120 emits a light 111 to the target finger 140 above the fingerprint detection area 121, and the light 111 is reflected on the surface of the finger 140 to form reflected light or scattered light scattered inside the finger 140, and in the related patent application, the reflected light and the scattered light are collectively referred to as reflected light for convenience of description. Since the ridge (ridge) 141 and the valley (valley) 142 of the fingerprint have different light reflection capacities, the reflected light 151 from the ridge and the reflected light 152 from the valley have different light intensities, and the reflected light is received by the sensing array 133 in the optical fingerprint module 130 and converted into corresponding electrical signals, i.e. fingerprint detection signals after passing through the optical component 132; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, thereby realizing an optical fingerprint recognition function at the terminal device 10.
In other embodiments, the optical fingerprint module 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint module 130 may be adapted to a non-self-luminous display screen, such as a liquid crystal display screen or other passive light emitting display screen. Taking the application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, in order to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the terminal device 10 may further include an excitation light source for optical fingerprint detection, where the excitation light source may be specifically an infrared light source or a light source of non-visible light with a specific wavelength, which may be disposed below the backlight module of the liquid crystal display or an edge region below a protective cover plate of the terminal device 10, and the optical fingerprint module 130 may be disposed below the edge region of the liquid crystal panel or the protective cover plate and guided by an optical path so that fingerprint detection light may reach the optical fingerprint module 130; alternatively, the optical fingerprint module 130 may be disposed below the backlight module, and the backlight module may be configured to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130 by making holes or other optical designs on the film layers such as the diffusion sheet, the brightness enhancement sheet, and the reflection sheet. When the optical fingerprint module 130 is used to provide an optical signal for fingerprint detection using an internal light source or an external light source, the detection principle is consistent with the above description.
It should be appreciated that in a specific implementation, the terminal device 10 further includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, that is positioned over the display screen 120 and covers the front side of the terminal device 10. Thus, in the embodiment of the present application, the pressing of the finger against the display screen 120 actually means pressing the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.
On the other hand, in some embodiments, the optical fingerprint module 130 may include only one optical fingerprint sensor, where the area of the fingerprint detection area 121 of the optical fingerprint module 130 is smaller and the position is fixed, so that the user needs to press the finger to a specific position of the fingerprint detection area 121 when inputting the fingerprint, otherwise, the optical fingerprint module 130 may not be able to collect the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include a plurality of optical fingerprint sensors. The optical fingerprint sensors may be disposed side by side below the display screen 120 in a spliced manner, and the sensing areas of the optical fingerprint sensors together form a fingerprint detection area 121 of the optical fingerprint module 130. That is, the fingerprint detection area 121 of the optical fingerprint module 130 may include a plurality of sub-areas, each corresponding to a sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area 121 of the optical fingerprint module 130 may be extended to a main area of the lower half of the display screen 120, that is, to a finger usual pressing area, thereby implementing a blind press type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 121 may also be extended to half or even the whole display area, thereby achieving half-screen or full-screen fingerprint detection.
In the embodiment of the present application, the display 120 is a flexible display, or referred to as a folding display. For example, the display 120 may be made of a flexible material such as plastic or metal.
The display 120 shown in fig. 1 is an out-turned folded display, and the display area of the display 120 is outside the display 120. Embodiments of the present application are also applicable to an inverted folded display where the display area of display 120 may be on the inside of display 120.
A flexible cover plate may be overlaid over the display screen 120 for protecting the display screen 120. The material of the flexible cover plate may be, for example, polyimide Film (PI) flexible resin or the like. In the following, the finger pressing flexible display screen refers to the finger pressing flexible display screen and the flexible cover plate covered on the upper surface of the finger pressing flexible display screen, and for brevity, the description is omitted.
Since the flexible cover plate does not provide support for the display 120. In this case, when the user presses the fingerprint detection area on the display screen 120 to perform fingerprint identification, the material of the flexible display screen 120 is softer, so that the depression can be generated in the pressing area of the finger, which not only affects the user experience, but also may affect the fingerprint identification performance of the optical fingerprint module 130, and may even cause damage to the flexible display screen and the optical fingerprint module 130.
Therefore, the embodiment of the application provides a scheme for preventing the flexible display screen from sinking, which can prevent the flexible display screen from sinking caused by finger pressing in the fingerprint identification process.
Fig. 3 is a schematic diagram of a fingerprint recognition apparatus according to an embodiment of the present application. The fingerprint recognition apparatus 300 is applied to an electronic device having a flexible display screen 310, and the fingerprint recognition apparatus 300 includes:
optical fingerprint module 320: the fingerprint detection area of the optical fingerprint module 320 is located in the flexible display screen 310, and the optical fingerprint module 320 is configured to be disposed below the fingerprint detection area to collect the optical signal reflected by the finger above the fingerprint detection area; the method comprises the steps of,
support 330: for being disposed between the flexible display screen 310 and the optical fingerprint module 320 for supporting a portion of the flexible display screen 310 within the fingerprint detection area.
Because the transparent support 330 is arranged between the flexible display screen 310 and the optical fingerprint module 320, when a finger is pressed in the fingerprint detection area to perform fingerprint identification, a part in the fingerprint detection area in the flexible display screen 310 can not sag due to the blocking of the transparent support 330, so that the user experience is improved, the influence on the fingerprint identification performance of the optical fingerprint module 320 is avoided, and meanwhile, the damage to the flexible display screen 310 and the optical fingerprint module 320 is reduced.
The flexible display 310 may be, for example, a flexible LCD display or a flexible OLED display. The light emitting layer of the flexible OLED display may include a plurality of organic light emitting diode light sources, where the optical fingerprint module 420 may use at least a portion of the organic light emitting diode light sources as the excitation light sources for fingerprint recognition.
The flexible display screen 310 may correspond to the display screen 120 shown in fig. 1 and 2, for example. The display screen 120 may include, for example, flexible cover glass, a touch control layer, a polarizer, an OLED light-emitting layer, a copper foil, a foam layer, a display light-shielding, heat-dissipating buffer layer, and at least one of various adhesive layers and supports. For the relevant description, reference may be made to the foregoing description of the display 120, and for brevity, the description will not be repeated.
The optical fingerprint module 320 may correspond to the optical fingerprint module 130 of fig. 1 and 2, for example. For example, the optical fingerprint module 320 may include one optical fingerprint sensor chip or include a plurality of optical fingerprint sensor chips that are stitched together, each of which may include one or more optical fingerprint sensors or an array of optical fingerprint sensors. And may further include an optical path guiding structure, a filter unit, a flexible circuit board, and the like. For the description, reference may be made to the foregoing description of the optical fingerprint module 130, and for brevity, description is omitted.
The distance between the optical fingerprint module 320 and the flexible display screen 310 may satisfy a certain condition, for example, the distance between the optical fingerprint sensor chip of the optical fingerprint module 320 and the light emitting layer of the flexible display screen 310 is between 150 and 300 micrometers, so as to ensure the imaging requirement of the optical fingerprint module 320 on the fingerprint image.
In the embodiment of the present application, the fingerprint detection area of the optical fingerprint module 320 is at least partially located in the display area of the flexible display screen 310. The fingerprint detection area may be located anywhere in the flexible display screen 310, determined by the location of the bend region 312 (or fold region) of the flexible display screen 310. For example, may be located at the edge or in the middle of the flexible display screen 310.
When fingerprint identification is performed, the light emitted by the light source irradiates the finger above the fingerprint detection area, and the light signal reflected by the finger reaches the optical fingerprint module 320. The optical fingerprint module 320 performs fingerprint recognition on the finger according to the collected optical signal carrying the fingerprint information of the finger.
The transparent support 330 is disposed between the flexible display screen 310 and the fingerprint recognition module 320, and is used for supporting the flexible display screen 310. The transparent support 330 can prevent the display screen 310 from sagging in a portion thereof in the finger-pressing area when the finger presses the fingerprint detection area in the flexible display screen 310. The portion of the transparent support 330 located below the fingerprint detection area has high light transmittance, so as to avoid blocking the optical signal carrying fingerprint information from the fingerprint detection area, so that the optical signal can smoothly reach the optical fingerprint module 320.
The transparent support 330 may be made of a transparent material such as optical glass or resin, for example, so long as the portion of the support 330 located below the fingerprint detection area is ensured to be transparent to light, which is not limited by the present application.
The area of the support 330 may be equal to the area of the fingerprint detection area.
For example, as shown in fig. 4, the support 330 may be located below the fingerprint detection area 402, where the area 401 occupied by the support 330 substantially overlaps the fingerprint detection area 402, or the area of the support 330 is approximately equal to the area of the fingerprint detection area 402.
The support 330 may also have an area that is larger than the area of the fingerprint detection area 402.
For example, as shown in fig. 5, the dashed box 501 shown in fig. 5 is the area occupied by the support 330. It can be seen that the support 330, while used to support a portion of the flexible display screen 310 within the fingerprint detection area 502, the support 330 may have an area greater than the area of the fingerprint detection area 502, such as covering the entire or a portion of the non-folded area of the flexible display screen 310, and even covering the entire area of the flexible display screen 310.
The transparent support 330 may have a thickness of, for example, 0.1 to 0.8 mm.
Embodiments of the present application provide two ways for securing the support 330.
Mode 1
The support 330 is fixed to the lower surface of the flexible display screen 310.
For example, the support 330 may be adhered to the lower surface of the flexible display screen 310.
The adhesive material between the support 330 and the flexible display screen 310 may be, for example, optically clear adhesive (Optically Clear Adhesive, OCA) or the like.
The OCA can be a double-sided adhesive tape without a base material, which is formed by making optical acrylic adhesive into a base material-free adhesive tape and then respectively attaching a layer of release film on the upper and lower bottom layers, namely the OCA can be a layer of base material-free double-sided adhesive tape with optical transparency.
The OCA may be any adhesive used for bonding transparent optical elements such as lenses, etc., as long as it has the characteristics of colorless transparency, light transmittance of more than a certain threshold value, for example, 90%, good bonding strength, curing at room temperature or medium temperature, small curing shrinkage, etc. For example, the OCA may be replaced with an optically transparent resin (Optical Clear Resin, OCR).
Wrinkles caused by stresses during use to flexible display screen 310 may be avoided by controlling the modulus of the OCA and the hardness after curing.
In this embodiment, the support 330 is surface-mounted to the lower surface of the flexible display screen 310. The optical fingerprint module 320 is disposed below the support 330. The optical fingerprint module 320 may be disposed below the support 330 in the following two manners. Described below in connection with fig. 6 to 9, respectively.
In one implementation, the optical fingerprint module 320 is disposed below the support 330 through a center 340 of the electronic device.
An electronic device, such as a terminal device, typically includes a center frame 340 to support the flexible display screen 310 and the like, the center frame 340 having a light-transmissive window positioned below the fingerprint detection area such that light signals reflected from a finger above the fingerprint detection area can be transmitted through the light-transmissive window to the optical fingerprint module 320.
In an embodiment of the present application, the middle frame 340 may be fixed to the lower surface of the support 330.
For example, the middle frame 340 is adhered to the lower surface of the support 330. Wherein, the middle frame 340 may be adhered to the lower surface of the support 330 by OCA glue or the like, for example.
In an embodiment of the present application, the middle frame 340 may also be fixed on the lower surface of the flexible display screen 310. For example, the support 330 is partially or fully positioned within the light-transmissive window of the middle frame 340.
Preferably, the upper surface of the supporting member 330 is the same as the upper surface of the middle frame 340 in order to avoid the appearance trace defect of the flexible display screen 310.
The optical fingerprint module 320 may be fixed on the middle frame 340.
For example, a step structure is disposed on a side of the light-transmitting window of the middle frame 340, which is close to the lower surface, and the edge of the optical fingerprint module 320 is fixed on the step structure.
That is, the support 330 is fixed to the lower surface of the flexible display screen 310, and the middle frame 340 is fixed to the lower surface of the support 330. The optical fingerprint module 320 is fixed on the middle frame 340, so that the optical fingerprint module 320 is fixed under the supporting member 330 through the middle frame 340.
An example of this is illustrated in fig. 6. In fig. 6, a flexible display screen 310, an optical fingerprint module 320, a support 330 and a center 340 are shown. Wherein the support 330 is adhered to the lower surface of the flexible display screen 310 by an adhesive 350 such as OCA. The middle frame 340 is adhered to the lower surface of the support 330 by an adhesive 360, such as OCA. The middle frame 340 is provided with a light-transmitting window, which is located below the fingerprint detection area. When a finger is pressed in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, so that the damage to the optical fingerprint module 320 caused by the depression of the flexible display screen is reduced.
As shown in fig. 6, a step structure is disposed at the lower side of the light-transmitting window of the middle frame 340, and the optical fingerprint module 320 is fixed on the step structure. The optical fingerprint module 320 may receive, through the light-transmitting window of the middle frame 340, an optical signal formed after being reflected by a finger and sent by the display screen 310, where the optical signal carries fingerprint information of the finger.
The flexible display screen 310 may also include a bottom foam layer, collectively referred to herein as a foam layer, for the bottom foam and backing of the flexible display screen 310 as a whole, which may be used for shading, heat dissipation, cushioning, etc., of the flexible display screen, not shown in fig. 6.
The support 330 may be fixed to the lower surface of the foam layer of the flexible display screen 310; alternatively, the support 330 may be disposed within a light-transmitting window of a foam layer of the flexible display screen 310, where the light-transmitting window of the foam layer is greater than or equal to the area of the support 330, such that the support 330 may be received within the light-transmitting window of the foam layer when the support 330 is adhered under the flexible display screen 310.
In addition, the outer ring portion of the support 330 and the flexible display screen 310 may be reinforced by a sealing adhesive 370.
In another implementation, the optical fingerprint module 320 is fixed on the lower surface of the support 330.
In this embodiment, the optical fingerprint module 320 is not fixed under the support 330 through the middle frame 340, but is directly fixed on the support 330.
For example, the optical fingerprint module 320 may be directly adhered to the lower surface of the support 330.
Further, optionally, a recess with a downward opening is provided on the support 330, and at least part of the optical fingerprint module 330 is disposed in the recess of the support 330.
For example, the optical fingerprint module 320 is fixed to the lower surface of the support 330 through a flexible circuit board 321 at the lower portion thereof.
The optical fingerprint module 320 may have a separate flexible circuit board (Flexible Printed Circuit Board, FPC) and connector to be attached as separate components to the flexible display screen 310 or the center 340.
The optical fingerprint sensor chip in the optical fingerprint module 320 is disposed on the flexible circuit board 321, and optical elements such as an optical filter may be further disposed above the optical fingerprint sensor chip. The optical fingerprint module 320 is fixed below the supporting piece 330 through the circuit board 321, so that the optical element in the optical fingerprint module 320 is prevented from being directly attached to the supporting piece 330, the installation difficulty and complexity of the optical fingerprint module 320 can be reduced, and the maintainability is improved.
In addition, for the scenario that the optical fingerprint module 320 includes a plurality of optical fingerprint sensor chips, the plurality of optical fingerprint sensor chips can be fixed under the supporting member 330 at a time, so that the installation complexity can be reduced and the installation efficiency can be improved.
The circuit board 321 is disposed in parallel under the support 330. The circuit board 321 may have a bent portion. The shape of the bending part may be, for example, a U-shape. The two ends of the U-shaped bending part are parallel to each other. And, a rigid reinforcing plate, such as a metal reinforcing plate, may be disposed between two ends of the U-row, and at this time, the optical fingerprint sensor of the optical fingerprint module 320 may be welded (bonded) on the reinforcing plate.
The edge of the flexible circuit board 321 may be fixed at a non-groove of the lower surface of the support 330, so that optical elements such as an optical fingerprint sensor of the optical fingerprint module 320 are accommodated in the downward opening groove of the support 330.
The description will be given taking fig. 7 and 8 as examples. Wherein the fingerprinting device shown in fig. 7 is located below the edge of the flexible display screen 310 and the fingerprinting device shown in fig. 8 is located below the middle of the flexible display screen 310.
A flexible display screen 310, an optical fingerprint module 320, and a support 330 are shown in fig. 7 and 8. Wherein the support 330 is adhered to the lower surface of the flexible display screen 310 by an adhesive 350 such as OCA. The support 330 is provided with a downward opening groove, the optical fingerprint module 320 includes a flexible circuit board 321, the flexible circuit board 321 is adhered to a non-groove portion of the lower surface of the support 330 by an adhesive 380, such as double-sided tape, and the upper surface of the optical fingerprint module 320 is adhered to the groove by the adhesive 350, so that a part of optical elements of the optical fingerprint module 320 are disposed in the groove. When a finger is pressed in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, so that the damage to the optical fingerprint module 320 caused by the depression of the flexible display screen is reduced.
In fig. 7 and 8, the support 330 is fixed to the lower surface of the flexible display screen 310, and the optical fingerprint module 320 is directly fixed to the lower surface of the support 330. The optical fingerprint module 320 is not required to be disposed under the flexible display screen 310 through the middle frame, but is disposed under the flexible display screen 310 through the support 330. At this time, alternatively, the center may not be provided in the terminal device, but the corresponding function of the center may be realized by the support 330.
In addition, as shown in fig. 7 and 8, the support 330 is adhered to the lower surface of the foam layer 311 of the flexible display screen 310. Due to the presence of the light transmissive window, an air gap 313 exists between the support 330 and the flexible display screen 310 below the fingerprint detection area. The air gap 313 may be used to avoid hard contact between the flexible display screen 310 and the transparent support 330, protecting the flexible display screen 310 from damage. The air gap 313 may be replaced by a transparent and soft silica gel layer, or by support ribs formed of foam, or the like.
The support 330 may be fixed to the lower surface of the foam layer 311 of the flexible display screen 310 as shown in fig. 7 and 8; alternatively, the support 330 may be disposed in a light-transmitting window of the foam layer of the flexible display screen 310, where the light-transmitting window of the foam layer 311 is greater than or equal to the area of the support 330, so that the support 330 may be accommodated in the light-transmitting window of the foam layer 311 when the support 330 is adhered under the flexible display screen 310.
In addition, the outer ring portion of the optical fingerprint module 320 is reinforced with the supporting member 330 by the edge sealing adhesive 370.
Mode 2
The support 330 is fixed to a center 340 of the electronic device.
For example, a stepped structure is provided in the light-transmitting window of the middle frame 340 at a side near the upper surface, and the edge of the support 330 is fixed to the stepped structure.
Preferably, the upper surface of the support 330 is the same height as the upper surface of the middle frame 340. Therefore, the phenomenon of 'bulging' of the flexible display screen caused when the supporting piece is higher than the middle frame is avoided, and the influence on the image display and the service life of the flexible display screen is avoided.
The optical fingerprint module 320 may be fixed on the middle frame 340, for example, a step structure is disposed on a side of the light-transmitting window of the middle frame 340, which is close to the lower surface, and an edge of the optical fingerprint module 320 is fixed on the step structure.
Alternatively, the optical fingerprint module 320 may be fixed to the lower surface of the support 330, for example, directly adhered to the lower surface of the support 330.
An example of this is illustrated in fig. 9. In fig. 9, a flexible display screen 310, an optical fingerprint module 320, a support 330 and a center 340 are shown. Wherein the middle frame 340 is adhered to the lower surface of the flexible display screen 310 by an adhesive 390, such as OCA. The support 330 is disposed on the middle frame 340. As shown in fig. 9, a stepped structure is provided in the light-transmitting window of the middle frame 340 at a side near the upper surface, and the support 330 is fixed to the stepped structure. When a finger is pressed in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, so that the damage to the optical fingerprint module 320 caused by the depression of the flexible display screen is reduced.
As shown in fig. 9, a step structure is disposed at the lower side of the light-transmitting window of the middle frame 340, and the optical fingerprint module 320 is fixed on the step structure. The optical fingerprint module 320 may receive the light signal emitted from the display screen 310 and reflected by the finger through the light-transmitting window of the middle frame 340.
In addition, the outer ring portion of the middle frame 340 and the flexible display screen 310 may be reinforced by a sealing adhesive 370.
In mode 2, the supporting member 330 and the optical fingerprint module 320 are both fixed on the middle frame 340, and the supporting member 330 and the optical fingerprint module 320 are both fixed below the flexible display screen 310 through the middle frame 340. The support 330 can be effectively disposed under the flexible display screen 310 and the structure of the fingerprint recognition device is made compact.
In embodiment 1, the support 330 is fixed to the lower surface of the flexible display screen 310, and the optical fingerprint module 320 is fixed under the support 330 or directly to the lower surface of the support 330 through the middle frame 340. The support 330 can be effectively disposed under the flexible display screen 310 to support the flexible display screen. The implementation is simple, the structure of the middle frame 340 is not changed, and the 'swelling' phenomenon caused by the support 330 due to the process and the like can be avoided.
In the embodiment of the application, each glue layer on the fingerprint identification light path should be a transparent glue layer so as not to influence the collection of the optical signals. Each glue layer on the non-light path can be other non-light-transmitting glue layers. Not all glue layers are shown in the above figures.
The embodiment of the application also provides electronic equipment which comprises the flexible display screen and the fingerprint identification device in the various embodiments of the application.
Optionally, the electronic device further comprises a middle frame.
As an example and not by way of limitation, the electronic device in the embodiments of the present application may be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a notebook computer, a desktop computer, a game device, an in-vehicle electronic device, or a wearable intelligent device, and other electronic devices such as an electronic database, an automobile, and a bank automated teller machine (Automated Teller Machine, ATM). The wearable intelligent device comprises full functions, large size and complete or partial functions which can be realized independent of the intelligent mobile phone, for example: smart watches or smart glasses, etc., and are only focused on certain application functions, and need to be used in combination with other devices, such as smart phones, as well as devices for monitoring physical signs, such as smart bracelets, smart jewelry, etc.
It should be noted that, on the premise of no conflict, the embodiments and/or technical features in the embodiments described in the present application may be combined with each other arbitrarily, and the technical solutions obtained after combination should also fall into the protection scope of the present application.
It should be understood that the specific examples in the embodiments of the present application are intended to help those skilled in the art to better understand the embodiments of the present application, and not to limit the scope of the embodiments of the present application, and that those skilled in the art may make various modifications and variations on the basis of the above embodiments, and that these modifications or variations fall within the scope of the present application.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. The utility model provides a fingerprint identification's device, is applicable to the electronic equipment that has flexible display screen in order to realize the optical fingerprint detection under the screen, its characterized in that, fingerprint identification's device's fingerprint detection area is located flexible display screen's display area, just fingerprint identification's device includes:
The support piece is arranged below the flexible display screen and at least corresponds to the fingerprint detection area, so as to support the flexible display screen when a user presses a finger through the fingerprint detection area of the flexible display screen, wherein the support piece has light transmittance in the fingerprint detection area, and is adhered to the lower surface of the flexible display screen;
the optical fingerprint module is arranged below the supporting piece and comprises an induction array and an optical path guiding structure, the optical path guiding structure is used for guiding fingerprint detection light to the induction array, the induction array is used for receiving the fingerprint detection light and detecting fingerprint images of the fingers according to the fingerprint detection light, and a filter layer is arranged above the induction array; wherein the fingerprint detection light is an optical signal formed by a finger above the flexible display screen and transmitted to the optical fingerprint module through the flexible display screen and the support.
2. The device of claim 1, wherein the support is an optical glass or a light-transmitting resin, and is attached to the lower surface of the flexible display screen by an optically transparent adhesive.
3. The device of claim 2, wherein the support member is attached to the lower surface of the flexible display screen in a face-to-face manner, and the outer ring portion of the support member is further reinforced with edge sealing glue.
4. The device of claim 2, wherein the flexible display screen comprises a foam layer having a light-transmitting window formed therein in the fingerprint detection area, and wherein the support is secured to a lower surface of the foam layer or disposed within the light-transmitting window of the foam layer.
5. The device of claim 4, wherein the light-transmitting window of the foam layer provides a gap between the flexible display screen and the support, the gap being an air gap or being filled with a transparent silicone layer or foam support ribs for avoiding hard contact between the flexible display screen and the support.
6. The apparatus of claim 1, wherein the optical fingerprint module is fixed below the support by a center frame of the electronic device, wherein the center frame is formed with a light-transmitting window in a mounting area of the optical fingerprint module, and the optical fingerprint module receives fingerprint detection light passing through the flexible display screen and the support through the light-transmitting window.
7. The apparatus of claim 6, wherein a first step structure communicating with the light-transmitting window of the middle frame is formed at the lower side of the middle frame, and the optical fingerprint module setting part is accommodated inside the first step structure and fixed to the middle frame.
8. The apparatus of claim 6, wherein the support is fixed to the middle frame and the support is at the same height as an upper surface of the middle frame.
9. The apparatus of claim 8, wherein the light-transmitting window of the middle frame is provided with a second step structure at a side near the upper surface of the middle frame, the support is received in the second step structure, and an edge thereof is fixed to the step structure.
10. The device of claim 9, wherein the outer portion of the center and the flexible display are reinforced with a bead filler.
11. The device of claim 1, wherein the support is formed with a downwardly opening recess at the location of the fingerprint detection area, and the optical fingerprint module is at least partially disposed within the recess of the support.
12. The device of claim 7, wherein the optical fingerprint module further comprises a flexible circuit board carrying an optical fingerprint sensor chip, wherein the sensing array is formed on the optical fingerprint sensor chip, and wherein the optical fingerprint module is secured under the support by the flexible circuit board.
13. The device of claim 12, wherein the upper surface of the optical fingerprint module is adhered in the groove by an adhesive and adhered at a non-groove position of the lower surface of the support member by the flexible circuit board.
14. The device of claim 12, wherein the flexible circuit board is disposed in parallel below the supporting member, and the flexible circuit board has a U-shaped bent portion, a rigid reinforcing plate is disposed between two ends of the U-shaped bent portion, and the optical fingerprint sensor chip is fixed to the rigid reinforcing plate by welding.
15. An electronic device comprising a flexible display screen and a fingerprint recognition device arranged below the flexible display screen to enable off-screen optical fingerprint detection, wherein the fingerprint recognition device is a device for fingerprint recognition as claimed in any one of claims 1 to 14.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/083728 WO2020215187A1 (en) | 2019-04-22 | 2019-04-22 | Device for fingerprint recognition and electronic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110799990A CN110799990A (en) | 2020-02-14 |
| CN110799990B true CN110799990B (en) | 2023-09-12 |
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| CN201980003076.0A Active CN110799990B (en) | 2019-04-22 | 2019-04-22 | Fingerprint identification device and electronic equipment |
| CN202020022271.8U Active CN211375619U (en) | 2019-04-22 | 2020-01-06 | Fingerprint identification device and electronic equipment |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202020022271.8U Active CN211375619U (en) | 2019-04-22 | 2020-01-06 | Fingerprint identification device and electronic equipment |
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| CN (2) | CN110799990B (en) |
| WO (1) | WO2020215187A1 (en) |
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| CN110799990B (en) * | 2019-04-22 | 2023-09-12 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN212160699U (en) * | 2020-06-30 | 2020-12-15 | 上海耕岩智能科技有限公司 | Module structure |
| KR20220021046A (en) * | 2020-08-12 | 2022-02-22 | 삼성디스플레이 주식회사 | Display device and method for driving the same |
| CN111968520B (en) * | 2020-09-04 | 2024-03-26 | 京东方科技集团股份有限公司 | Display module, manufacturing method of display module, display panel and display device |
| WO2022141607A1 (en) * | 2020-12-31 | 2022-07-07 | 深圳市汇顶科技股份有限公司 | Optical fingerprint detection apparatus and electronic device |
| CN113095245A (en) * | 2021-04-19 | 2021-07-09 | 业泓科技(成都)有限公司 | Touch display module and fingerprint identification module under screen thereof |
| CN113469031B (en) * | 2021-06-30 | 2024-11-29 | 维沃移动通信有限公司 | Electronic equipment |
| CN113745302B (en) * | 2021-09-03 | 2024-08-02 | 深圳市汇顶科技股份有限公司 | Reinforcing structure, method for manufacturing reinforcing structure, display assembly and electronic equipment |
| US12167557B2 (en) | 2021-09-06 | 2024-12-10 | Beijing Boe Technology Development Co., Ltd. | Flexible foldable display module, method for manufacturing the same, and flexible foldable display apparatus |
| CN114185402A (en) * | 2021-12-03 | 2022-03-15 | 维沃移动通信有限公司 | Display module and electronic equipment |
| CN114495720B (en) * | 2022-01-30 | 2023-12-26 | 京东方科技集团股份有限公司 | Flexible display module, display device and electronic equipment |
| CN115482748A (en) * | 2022-09-20 | 2022-12-16 | 业泓科技(成都)有限公司 | Curved surface display device with fingerprint identification function |
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| WO2020215187A1 (en) | 2020-10-29 |
| CN110799990A (en) | 2020-02-14 |
| CN211375619U (en) | 2020-08-28 |
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