WO2018171178A1 - 指纹识别器件及控制方法、触摸显示面板、触摸显示装置 - Google Patents

指纹识别器件及控制方法、触摸显示面板、触摸显示装置 Download PDF

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WO2018171178A1
WO2018171178A1 PCT/CN2017/106844 CN2017106844W WO2018171178A1 WO 2018171178 A1 WO2018171178 A1 WO 2018171178A1 CN 2017106844 W CN2017106844 W CN 2017106844W WO 2018171178 A1 WO2018171178 A1 WO 2018171178A1
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Prior art keywords
interface
fingerprint
substrate
touch display
fingerprint recognition
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PCT/CN2017/106844
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English (en)
French (fr)
Inventor
谭纪风
杨亚锋
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京东方科技集团股份有限公司
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Priority to US15/780,215 priority Critical patent/US11361584B2/en
Publication of WO2018171178A1 publication Critical patent/WO2018171178A1/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
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
    • G02B6/08—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images with fibre bundle in form of plate
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/1462—Coatings
    • H01L27/14621—Colour filter arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14625—Optical elements or arrangements associated with the device
    • H01L27/14629—Reflectors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04109—FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers

Definitions

  • the embodiments of the present disclosure belong to the field of display technologies, and in particular, to a fingerprint identification device and a control method, a touch display panel, and a touch display device.
  • fingerprint recognition technology has been widely used in many fields, such as mobile phones, tablets and televisions in electronic equipment terminals, access control and safes in security protection systems.
  • the implementation methods of fingerprint acquisition mainly include optical, capacitive and ultrasonic imaging technologies, among which the optical fingerprint identification technology has a relatively large recognition range and relatively low cost.
  • optical fingerprint recognition technology used in mobile terminals such as mobile phones, such as mobile phones is still immature, and in the prior art, the backlight is used to illuminate the finger, and then the light beam is diffusely reflected by the finger to the photoelectric sensor device to discriminate the fingerprint texture.
  • the embodiments of the present disclosure provide a fingerprint recognition device, a touch display panel, and a touch for the problem that the existing liquid crystal display is difficult to accurately identify the fingerprint.
  • Display device and control method of fingerprint recognition device are provided.
  • a fingerprint recognition device includes: a photosensor and an optical waveguide structure for contacting a fingerprint on a touch substrate; the optical waveguide structure including a dielectric material and a waveguide disposed at intervals a material, the dielectric material and a side of the waveguide material facing away from the touch substrate are used for contact with a fingerprint to transmit light incident on the waveguide material by the touch substrate to the interface between the dielectric material and the waveguide material and then propagate to The waveguide material faces away from the face of the touch substrate.
  • an interface of the waveguide material and the touch substrate is a first interface, the waveguide material
  • the interface between the material and the adjacent two dielectric materials is a second interface and a third interface, respectively, and the surface of the waveguide material facing away from the touch substrate is a fourth interface;
  • the photoelectric sensor When the trough of the fingerprint is in contact with the optical waveguide structure, the light incident on the waveguide material from the first interface is totally reflected at the second interface and the third interface, and then propagates to the fourth interface and then passes through the second interface and the third interface. Performing total reflection return is recognized by the photoelectric sensor;
  • the ridge of the fingerprint When the ridge of the fingerprint is in contact with the optical waveguide structure, the light incident on the waveguide material by the first interface is totally reflected by the second interface and the third interface to the fourth interface, and the light is not recognized by the photoelectric sensor.
  • the second interface and the third interface are convex surfaces of one side of the same third interface or convex surfaces that are convex toward one side of the second interface.
  • the waveguide material has a refractive index of n2
  • the dielectric material has a refractive index of n3
  • the touch substrate has a material refractive index of n1, wherein n3 ⁇ n2, n1 ⁇ n2.
  • a touch display panel including the above-mentioned fingerprint recognition device, further includes a touch display substrate, and the optical waveguide structure is disposed on a touch display surface of the touch display substrate.
  • the photosensor is disposed on a side of the touch display substrate facing away from the optical waveguide structure.
  • the fingerprint recognition device includes a plurality of optical waveguide structures and a plurality of photosensors, and the optical waveguide structure is in one-to-one correspondence with the photosensors.
  • the touch display substrate includes a pixel region and a non-pixel region around the pixel region, and the photosensor is disposed in the non-pixel region.
  • the touch display substrate is an OLED
  • the OLED sequentially includes a light emitting layer, an encapsulation layer, and a cover layer
  • the fingerprint recognition device further includes a buffer layer
  • the buffer layer is disposed on the optical waveguide structure
  • the refractive index of the material constituting the buffer layer is the same as the refractive index of the material constituting the encapsulation layer.
  • the touch display panel includes a color film substrate and an array substrate disposed opposite to each other, the color film substrate is a touch display substrate, and the optical waveguide structure is disposed on the color film substrate, the photoelectric The sensor is disposed on a side of the array substrate adjacent to the color filter substrate.
  • a touch display device comprising the above touch display panel.
  • a method for controlling a fingerprint identification device is provided.
  • the fingerprint identification device is used for fingerprint identification, and the following steps are included:
  • the fingerprint recognition device is in contact with the fingerprint, and the photoelectric sensor performs fingerprinting according to the reflected light at the received finger fingerprint Identification.
  • an angle of light incident on the first interface with a normal thereof is ⁇ 1
  • the light that is incident on the first interface is totally reflected between the second interface and the third interface, and then propagated to the fourth interface, wherein the refractive index of the waveguide material is n2, and the refractive index of the dielectric material For n3.
  • an angle of light directed from the first interface to the second interface and its normal is ⁇ 2, and is controlled
  • the photosensor is configured to receive light that is totally reflected back through the second interface and the third interface by the fourth interface.
  • the step of recording stray light received by the photosensor is further included before performing fingerprint recognition;
  • the photoelectric sensor performs fingerprint recognition according to the reflected light at the received finger fingerprint, and performs fingerprint recognition after subtracting the stray light from the reflected light actually received by the photoelectric sensor.
  • FIG. 1 is a schematic structural diagram of fingerprint recognition of a liquid crystal display according to a basic embodiment of the present disclosure
  • 2-4 is a schematic structural diagram of a fingerprint identification device according to Embodiment 1 of the present disclosure.
  • FIG. 5-8 are schematic structural diagrams of a fingerprint identification device according to Embodiment 2 of the present disclosure.
  • FIG. 9-11 are schematic structural diagrams of a touch display panel according to Embodiment 3 of the embodiment of the present disclosure.
  • a fingerprint recognition device includes: a photosensor and an optical waveguide structure for contacting a fingerprint on a touch substrate; the optical waveguide structure including a dielectric material and a waveguide disposed at intervals a material, the dielectric material and a side of the waveguide material facing away from the touch substrate are used for contact with a fingerprint to transmit light incident on the waveguide material by the touch substrate to the interface between the dielectric material and the waveguide material and then propagate to The waveguide material faces away from the face of the touch substrate.
  • the light beam of the backlight is diffusely reflected at the finger fingerprint, and a part of the light beam is received by the photosensor 21, and the received fingerprint of the finger fingerprint
  • the diffuse light energy of 12 and the valley of the fingerprint may be different, and the light energy of the valley 11 of the fingerprint is lower than the ridge 12 of the fingerprint, and thus the difference is used for fingerprint recognition.
  • the transmittance of the liquid crystal layer is relatively low, the light energy of the backlight of the liquid crystal display to the photosensor 21 after passing through the liquid crystal layer twice is very low, and the photosensor 21 only receives a part of the fingerprint of the finger.
  • the reflected beam, and the divergence of the divergent light reflected by the trough 11 of the fingerprint of the finger and the ridge 12 of the fingerprint is extremely small, and there is interference between the trough 11 of the finger fingerprint and the ridge, so the above Liquid crystal displays are not sufficient for high-precision fingerprint recognition.
  • Example embodiments that are a series of improvements of the present disclosure are further set forth below.
  • the embodiment provides a fingerprint identification device, as shown in FIG. 2-4, comprising: a photosensor 21 and an optical waveguide structure 22; the optical waveguide structure 22 is configured to be disposed on the touch substrate and in contact with the fingerprint.
  • the optical waveguide structure 22 includes a dielectric material 23 and a waveguide material 24 disposed apart from each other, and a side of each of the dielectric material 23 and the waveguide material 24 that faces away from the touch substrate 4 is used for contact with a fingerprint to be touched.
  • the light incident on the waveguide material 24 by the substrate 4 is totally reflected at the interface between the dielectric material 23 and the waveguide material 24 and propagates to the surface of the waveguide material 24 that faces away from the touch substrate 4.
  • the fingerprint identification device shown in FIG. 2 includes photoelectric sensors disposed inside (or on the lower side of) the touch substrate. And an optical waveguide structure 22 disposed on the touch substrate; see FIG. 3, the optical waveguide structure 22 includes dielectric materials 23 and waveguide materials 24 that are vertically disposed and alternately spaced apart.
  • 4 is a partial enlarged view of a broken line portion of the optical waveguide structure 22 of FIG. 3. As seen from FIG. 4, after the light is incident from the touch substrate 4 into the lower end surface of the waveguide material 23, the dielectric material 23 and the waveguide material 24 are present. The interface between the electrodes is subjected to multiple total reflections and then propagated to the face of the waveguide material 23 facing away from the touch substrate 4.
  • the valley 11 of the fingerprint is in contact with the face of the waveguide material 23 facing away from the touch substrate 4
  • the trough is filled, for example, by air
  • the light is returned by total reflection to be recognized by the photosensor 21;
  • the ridge of the fingerprint 12 is in contact with the face of the waveguide material 23 facing away from the touch substrate 4, and then the light at the ridge 12 is diffusely reflected so as not to be recognized by the photosensor 21, which is equivalent to an increase between the ridge 12 and the recognized light at the valley 11.
  • the difference value which improves the accuracy of the photoelectric sensor for trough and ridge recognition.
  • the embodiment provides a fingerprint identification device, as shown in FIGS. 5 to 8, including: a photosensor 21 and an optical waveguide structure 22 for contacting the fingerprint on the touch substrate 4;
  • the optical waveguide structure 22 includes (for example a dielectric material 23 and a waveguide material 24 disposed substantially perpendicularly disposed on the touch substrate 4 and spaced apart in an alternately complete manner, wherein an interface between the waveguide material 24 and the touch substrate 4 is The first interface, the interface between the waveguide material 24 and the adjacent two dielectric materials 23 is a second interface and a third interface, respectively, and the surface of the waveguide material 24 facing away from the touch substrate 4 is a fourth interface;
  • the four interfaces are configured to be in contact with the fingerprint to transmit the light incident into the waveguide material 24 through the first interface to the fourth interface after performing multiple total reflections at the second interface and the third interface;
  • the light that enters the waveguide material 24 through the first interface is totally reflected at the second interface and the third interface, and then propagates to the fourth interface and then passes through the second interface.
  • the third interface performs total reflection return to be recognized by the photosensor 21;
  • the ridge 12 of the fingerprint When the ridge 12 of the fingerprint is in contact with the optical waveguide structure 22, the light incident on the waveguide material 24 from the first interface is totally reflected by the second interface and the third interface to be transmitted to the fourth interface, and is then emitted. The reflection returns to the photosensor 21 and is not recognized by the photosensor 21.
  • the waveguide material 24 has a refractive index of n2
  • the dielectric material 23 has a refractive index of n3
  • the touch substrate 4 has a material refractive index of n1, wherein n3 ⁇ n2 , n1 ⁇ n2.
  • the waveguide material 24 and the dielectric material 23 are, for example, transparent polymer materials as long as the refractive indices of the two satisfy the above conditions.
  • the waveguide material 24 and the dielectric material 23 are photopolymers, that is, coated with a photopolymer to form an optical waveguide layer, and then different amounts of exposure are applied to the photopolymer of the optical waveguide layer to form the waveguide material 24 and the dielectric material 23, respectively.
  • the embodiment further provides a control method for fingerprint recognition by using the fingerprint identification device.
  • the angle between the light directed to the first interface and the normal of the first interface is ⁇ 1, by the first
  • the angle between the light incident on the second interface and the normal of the first interface is ⁇ 2
  • the angle between the light incident on the fourth interface and the normal of the fourth interface is ⁇ 3, which is directed by the waveguide material 24
  • the angle between the light of the second interface and the normal of the second interface is ⁇ .
  • n1sin ⁇ 1 n2sin ⁇ 2
  • the incident ray is totally reflected in the waveguide material 24:
  • the light that is incident on the first interface is totally reflected between the second interface and the third interface and then propagates to the fourth interface.
  • the refractive index of the ridge is large, so that the presence of the ridge destroys the total reflection between the waveguide material 24 and the air, and then The light propagating in the waveguide material exits due to diffuse reflection at the fourth interface, and the photosensor 21 cannot receive the light returned by the fourth interface again through the second interface and the third interface.
  • the waveguide material 24 and the dielectric material 23 of the optical waveguide structure 22 are, for example, as shown in FIG. 8, and are formed into an arc structure, that is, an optical waveguide structure 22 having a certain curvature, such an arc.
  • the function of the shape structure is to make the total reflection angle of the light in the waveguide material 24 at the interface between the waveguide material and the dielectric material become smaller, that is, ⁇ 2 decreases, and ⁇ 3 increases, and the effect is to ensure that the air (air) can be at the external medium. Total reflection occurs.
  • the schematic diagram in FIG. 8 is an example in which the second interface and the third interface protrude to the right side. It can be understood that the second interface and the third interface are also protruded to the left side, and the specific curvature is, for example, The adjustment is made according to the refractive index of the waveguide material and the refractive index of the dielectric material.
  • the light received by the photoelectric sensor is stray light
  • the control method further includes the step of performing a zeroing process on the stray light before the fingerprint recognition.
  • the fingerprint is satisfied by using the light that satisfies the defined condition, and since the light that does not satisfy the condition (also called stray light) will not be limited to the waveguide material 24, the light that does not satisfy the condition passes through.
  • the refraction and the reflection of each film layer are also received by the photosensor 21.
  • the photosensor 21 receives the stray light for recording before the fingerprint recognition, that is, the trough and the ridge difference value of the fingerprint are calculated based on the presence of the stray light intensity.
  • the embodiment provides a touch display panel, as shown in FIG. 9 , including the above-mentioned fingerprint recognition device, further comprising a touch display substrate, wherein the optical waveguide structure 22 is disposed on a touch display surface of the touch display substrate, The photosensor 21 is disposed on a side of the touch display substrate that faces away from the optical waveguide structure 22.
  • the touch substrate 4 in this embodiment is a touch display substrate.
  • a liquid crystal touch display substrate is taken as an example.
  • the liquid crystal layer 3 is between the color filter substrate 31 and the array substrate 32.
  • the waveguide structure 22 is disposed on the color filter substrate 31.
  • the photosensor 21 is disposed on a side of the array substrate 32 adjacent to the color filter substrate 31. After the light of the backlight 33 is incident from the underside of the waveguide material 24, the dielectric material 23 and the waveguide material are formed. The interface of 24 is subjected to multiple total reflections and then propagated to the face of the waveguide material 24 facing away from the color filter substrate 31.
  • the touch substrate 4 is an OLED.
  • the OLED includes a light-emitting layer 51, an encapsulation layer 52, and a cover layer 53 in turn.
  • the fingerprint recognition device further includes a buffer layer 25 disposed between the optical waveguide structure 22 and the touch substrate 4, and The refractive index of the material of the buffer layer 25 is the same as the refractive index of the material constituting the encapsulation layer 52.
  • the buffer layer 25 is added to the optical waveguide structure 22.
  • the buffer layer 25 functions as an index matching, that is, the refractive index of the buffer layer 25 is equal to the refractive index of the encapsulation layer 52, so that the direction of propagation of the light is not changed, that is, from The light reflected from the finger passes through the buffer layer 25, and the propagation direction of the cover layer 53 to the encapsulation layer 52 does not change.
  • the touch display substrate includes a pixel region 6 and a non-pixel region around the pixel region 6, and the photosensor 21 is disposed in the non-pixel region.
  • the non-pixel area of the OLED is a pixel defining layer (PDL)
  • the pixel area is composed of the light emitting layer 51
  • the photosensor 21 is disposed above the PDL, so that the aperture ratio of the display device is not affected;
  • the fingerprint recognition device includes a plurality of optical waveguide structures 22 and a plurality of photosensors 21, and the optical waveguide structure 22 and the photosensors 21 are one by one.
  • the optical waveguide structures 22 are respectively disposed at an angle to the photosensor 21, for example, the same angle; alternatively, the optical waveguide structures 22 are also respectively disposed, for example, with the optoelectronics
  • the sensor 21 is perfectly aligned in the vertical direction.
  • the optical waveguide structure 22 is, for example, an entire layer, and is also disposed, for example, only at a position corresponding to the photosensor 21 as shown in FIG.
  • the specific embodiments of the above embodiments can also make many changes; for example, the waveguide material 24 in the optical waveguide structure 22 and the specific material of the dielectric material 23 are selected according to specific products, for example.
  • the embodiment provides a touch display device including the above touch display panel.
  • the display device is, for example, a liquid crystal display panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like, and any product or component having a display function.
  • the fingerprint identification device of the embodiment of the present disclosure includes a photosensor and an optical waveguide structure disposed on the touch substrate.
  • the optical waveguide structure includes a dielectric material and a waveguide material which are disposed apart from each other. After the light is incident by the waveguide material, the dielectric material is The interface between the waveguide materials is totally totally reflected and then propagated to the waveguide material away from the touch base On the face of the board.
  • the fingerprint recognition device of the embodiment of the present disclosure is applicable to various display devices.

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Abstract

一种指纹识别器件、触摸显示面板及指纹识别的控制方法，指纹识别器件包括光电传感器(21)和光波导结构(22)，光波导结构(22)包括间隔开而设置的介质材料(23)和波导材料(24)，光线由波导材料(24)射入后，在介质材料(23)与波导材料(24)之间的界面进行全反射后传播至波导材料(24)背离触摸基板(4)的面上。若指纹的波谷(11)与该面接触，则由于波谷(11)内为空气，光线全反射返回由光电传感器(21)识别；若指纹的波脊(12)与该面接触，则波脊(12)处光线发生漫反射不会被反射回到光电传感器(21)以进行识别。该指纹识别器件适用于各种显示装置。

Description

指纹识别器件及控制方法、触摸显示面板、触摸显示装置
相关申请的交叉引用
本申请要求于2017年3月24日递交中国专利局的、申请号为201710183516.8的中国专利申请的权益，该申请的全部内容以引用方式并入本文。
技术领域
本公开实施例属于显示技术领域，具体涉及一种指纹识别器件及控制方法、触摸显示面板、触摸显示装置。
背景技术
如今指纹识别技术已在诸多领域得到广泛应用，例如电子设备终端中的手机、平板电脑和电视等；安全防护系统中的门禁和保险柜等。指纹采集的实现方式主要有光学式、电容式和超声成像式等技术，其中光学式指纹识别技术的识别范围相对较大，且成本相对较低。
目前，液晶显示器如手机等移动终端使用的光学式指纹识别技术尚不成熟，并且现有技术中多以背光源照明手指后由手指将光束进行漫反射至光电传感器装置进行判别指纹纹路。
发明内容
为至少部分地克服上述现有技术中的缺陷和/或不足，本公开实施例针对现有的液晶显示器很难对指纹进行准确的识别的问题，提供一种指纹识别器件、触摸显示面板、触摸显示装置及指纹识别器件的控制方法。
解决本公开实施例技术问题所采用的技术方案是：
根据本公开实施例的一个方面，提供了一种指纹识别器件，包括：光电传感器以及用于设于触摸基板上与指纹接触的光波导结构；所述光波导结构包括间隔设置的介质材料和波导材料，所述介质材料和波导材料背离所述触摸基板的一面均用于与指纹接触，以将由触摸基板射入波导材料的光，在介质材料与波导材料之间的界面进行全反射后传播至所述波导材料背离触摸基板的面上。
根据本公开的实施例，所述波导材料与触摸基板的界面为第一界面，所述波导材 料与相邻的两个介质材料的界面分别为第二界面、第三界面，所述波导材料背离触摸基板的面为第四界面；
当指纹的波谷与光波导结构接触时，所述由第一界面射入波导材料的光在第二界面、第三界面进行全反射后传播至第四界面后再次经第二界面、第三界面进行全反射返回由光电传感器识别；
当指纹的波脊与光波导结构接触时，所述由第一界面射入波导材料的光在第二界面、第三界面进行全反射传播至第四界面后出射不被光电传感器识别。
根据本公开的实施例，所述第二界面、第三界面为同向第三界面的一侧凸起或者同向第二界面的一侧凸起的弧形面。
根据本公开的实施例，所述波导材料的折射率为n2，所述介质材料折射率为n3，所述触摸基板的材料折射率为n1，其中，n3＜n2，n1＜n2。
根据本公开实施例的另一个方面，还提供一种触摸显示面板，包括上述的指纹识别器件，还包括触摸显示基板，所述光波导结构设于所述触摸显示基板的触摸显示面上，所述光电传感器设于所述触摸显示基板背离光波导结构的一侧。
根据本公开的实施例，所述指纹识别器件包括多个光波导结构和多个光电传感器，且所述光波导结构与所述光电传感器一一对应。
根据本公开的实施例，所述触摸显示基板包括像素区和像素区周边的非像素区，所述光电传感器设于所述非像素区。
根据本公开的实施例，所述触摸显示基板为OLED，所述OLED依次包括发光层、封装层和覆盖层，所述指纹识别器件还包括缓冲层，所述缓冲层设于所述光波导结构与触摸显示基板之间，且构成所述缓冲层的材料的折射率与构成所述封装层的材料的折射率相同。
根据本公开的实施例，所述触摸显示面板包括相对设置的彩膜基板和阵列基板，所述彩膜基板为触摸显示基板，所述光波导结构设于所述彩膜基板上，所述光电传感器设于阵列基板靠近彩膜基板的一侧。
根据本公开实施例的又一个方面，还提供一种触摸显示装置，包括上述触摸显示面板。
根据本公开实施例的再又一个方面，还提供一种指纹识别器件的控制方法，采用上述的指纹识别器件进行指纹识别，包括以下步骤：
指纹识别器件与指纹接触，光电传感器根据接收的手指指纹处的反射光进行指纹 识别。
根据本公开的实施例，射向所述第一界面的光与其法线的夹角为θ1，控制
Figure PCTCN2017106844-appb-000001
时，
以使射向所述第一界面的光在第二界面、第三界面之间进行全反射后传播至所述第四界面，其中所述波导材料的折射率为n2，所述介质材料折射率为n3。
根据本公开的实施例，由所述第一界面射向第二界面的光与其法线的夹角为θ2，控制
Figure PCTCN2017106844-appb-000002
时，
以使所述光电传感器接收到由第四界面再次经第二界面、第三界面进行全反射返回的光。
根据本公开的实施例，在进行指纹识别之前还包括对光电传感器接收到的杂散光进行记录的步骤；
所述光电传感器根据接收的手指指纹处的反射光进行指纹识别是将光电传感器实际接受的反射光减去杂散光后进行指纹识别。
附图说明
通过下文中参照附图对本公开所作的详细描述，本公开的上述和其它特征和优点将显而易见，并可帮助获得对本公开有全面的理解。在附图中：
图1为本公开一种基本实施例的液晶显示器指纹识别的结构示意图；
图2-4为本公开实施例的实施例1的指纹识别器件的结构示意图；
图5-8为本公开实施例的实施例2的指纹识别器件的结构示意图；
图9-11为本公开实施例的实施例3的触摸显示面板的结构示意图。
具体实施方式
下面通过实施例，并结合附图，对本公开实施例的技术方案作进一步具体的说明。在说明书中，相同或相似的附图标号指示相同或相似的部件。下述参照附图对本公开实施方式的说明旨在对本公开的总体发明构思进行解释，而不应当理解为对本公开的一种限制。
另外，在下面的详细描述中，为便于解释，阐述了许多具体的细节以提供对本披露实施例的全面理解。然而明显地，一个或多个实施例在没有这些具体细节的情况下也可以被实施。在其他情况下，公知的结构和装置以图示的方式体现以简化附图。
附图中各部件尺寸和形状不反映本公开实施例的指纹识别器件、触摸显示面板、触摸显示装置的部件的真实比例，目的只是示意说明本公开内容。
根据本公开实施例的总体发明构思，提供一种指纹识别器件，包括：光电传感器以及用于设于触摸基板上与指纹接触的光波导结构；所述光波导结构包括间隔设置的介质材料和波导材料，所述介质材料和波导材料背离所述触摸基板的一面均用于与指纹接触，以将由触摸基板射入波导材料的光，在介质材料与波导材料之间的界面进行全反射后传播至所述波导材料背离触摸基板的面上。
作为示例，在本公开的一种基本实施例中，具体参见图1的示意图，背光的光束在手指指纹处发生漫反射，其中一部分光束会被光电传感器21接收，所接收的手指指纹的波脊12和指纹的波谷11漫反射光能会有所差异，指纹的波谷11的光能相对于指纹的波脊12低，由此差异来进行指纹识别。
然而，由于液晶层的透过率相对较低，因此上述液晶显示器中背光源的光束两次经过液晶层后到达光电传感器21的光能量非常低，并且光电传感器21只是接收到了一部分的手指指纹漫反射的光束，而且手指指纹的波谷11和指纹的波脊12所漫反射的发散光的光能量差异极小，同时在手指指纹的波谷11与波脊之间还存在环境光的干扰，因此上述液晶显示器不足以对指纹进行高精确度的识别。
下面进一步阐述作为本公开的一系列改进的示例实施例。
实施例1：
本实施例提供一种指纹识别器件，如图2-4所示，包括：光电传感器21和光波导结构22；光波导结构22用于设于触摸基板上与指纹接触。所述光波导结构22包括间隔开而设置的介质材料23和波导材料24，所述介质材料23和波导材料24各自的与所述触摸基板4背离的一面均用于与指纹接触，以将由触摸基板4射入波导材料24的光，在介质材料23与波导材料24之间的界面进行全反射后传播至所述波导材料24的与触摸基板4背离的面上。
具体的，如图2所示指纹识别器件包括设于触摸基板内部(或下侧)的光电传感 器21和设于触摸基板上的光波导结构22；参见图3，光波导结构22包括竖直布置的、且交替地间隔设置的介质材料23和波导材料24。图4为图3的光波导结构22中虚线部分的局部放大图，从图4中看出，光线在从触摸基板4射入波导材料23的下端面处之后，在介质材料23与波导材料24之间的界面进行多次全反射，然后传播至波导材料23背离触摸基板4的面上。这样，在指纹的波谷11与波导材料23的背离触摸基板4的面接触的情况下，那么由于波谷内例如由空气填充，则光线经全反射返回以由光电传感器21识别；若指纹的波脊12与波导材料23的背离触摸基板4的面接触，那么波脊12处光线发生漫反射从而不会被光电传感器21识别，相当于提高了波脊12与波谷11处的识别到的光线之间的差异值，从而提高了光电传感器对波谷与波脊识别准确率。
实施例2：
本实施例提供一种指纹识别器件，如图5至8所示，包括：光电传感器21以及用于设于触摸基板4上与指纹接触的光波导结构22；所述光波导结构22包括(例如基本上垂直地布置于所述触摸基板4上、且以交替地完全的方式)间隔开而设置的介质材料23和波导材料24，其中，所述波导材料24与触摸基板4之间的界面为第一界面，所述波导材料24与相邻的两个介质材料23之间的界面分别为第二界面、第三界面，所述波导材料24的背离触摸基板4的面为第四界面；第四界面被配置用于与指纹接触，以将穿过第一界面射入波导材料24的光，在第二界面、第三界面进行多次全反射后传播至第四界面上；
当指纹的波谷11与光波导结构22接触时，所述穿过第一界面射入波导材料24的光在第二界面、第三界面进行全反射后传播至第四界面后再次经第二界面、第三界面进行全反射返回以由光电传感器21识别；
当指纹的波脊12与光波导结构22接触时，所述由第一界面射入波导材料24的光在第二界面、第三界面进行全反射传播至第四界面后出射，从而不再被反射返回光电传感器21，不会被光电传感器21识别。
在本公开的示例性实施例中，例如，所述波导材料24的折射率为n2，所述介质材料23折射率为n3，所述触摸基板4的材料折射率为n1，其中，n3＜n2，n1＜n2。
具体的，波导材料24、介质材料23例如是透明的聚合物材料，只要二者的折射率满足上述条件。作为本实施例中的一种示例性实施方案，波导材料24与介质材料 23均为光致聚合物，即采用光致聚合物进行涂覆形成光波导层，然后向光波导层的光致聚合物施加不同的曝光量以分别形成波导材料24与介质材料23。
本实施例还提供一种采用该指纹识别器件进行指纹识别的控制方法：参见图5，射向所述第一界面的光与第一界面的法线的夹角为θ1，由所述第一界面射向第二界面的光与第一界面的法线的夹角为θ2，射向所述第四界面的光与第四界面的法线的夹角为θ3，由波导材料24射向第二界面的光与第二界面的法线的夹角为θ。
根据折射定律：n1sinθ1＝n2sinθ2，而入射光线在波导材料24中发生全反射：n2sinθ＝n3，其中，θ2+θ＝90°，即θ2＝arccos(n3/n2)。
因此，当存在约束条件
Figure PCTCN2017106844-appb-000003
时，
射向所述第一界面的光在第二界面、第三界面之间进行全反射后传播至所述第四界面。
当指纹的波谷11接触第四界面时，由于根据在第一界面与第二、第三界面之间发全反射的情况以及几何关系得知θ2＝θ3，并且由于在第四界面处指纹的波谷的存在而在第四界面处发生全反射，由于第四界面为空气和波导材料的界面，空气折射率视为1，故n2sinθ2＝1，因此，若
Figure PCTCN2017106844-appb-000004
如图6所示，所述光电传感器21接收到由第四界面再次经第二界面、第三界面进行全反射返回的光。
对比而言，当指纹的波脊12接触第四界面时，如图7所示，波脊的折射率较大，从而波脊的存在会破坏波导材料24与空气之间的全反射，则在波导材料中传播的光线由于在第四界面处发生漫反射而出射，光电传感器21无法接收到由第四界面再次经第二界面、第三界面进行全反射返回的光。
作为本实施例中的另一种实施方案，光波导结构22的波导材料24、介质材料23例如如图8所示，设为弧形结构，即形成一定弧度的光波导结构22，这样的弧形结构设置的作用是：使光线在波导材料24内在波导材料与介质材料之间界面处的全反射角度不断变小，即θ2减小，θ3增加，效果是保证在外部介质处(空气)能发生全反射。其中，图8中的示意图是第二界面、第三界面同向右侧突出的示例，能够理解的是，第二界面、第三界面同向左侧突出的情况也是可行的，具体的弧度例如根据波导材料的折射率及介质材料折射率进行调整。
在本公开的示例性实施例中，当
Figure PCTCN2017106844-appb-000005
Figure PCTCN2017106844-appb-000006
时，
所述光电传感器接收到的光为杂散光；
所述控制方法在指纹识别之前还包括对杂散光进行清零处理的步骤。
也就是说，本实施例中利用满足限定条件的光线进行指纹识别，由于不满足条件的光线(也称杂散光)将不会被限定在波导材料24中，则这种不满足条件的光线经过折射和各膜层的反射也被光电传感器21接收到。但由于这部分杂散光是固定存在的，因此在指纹识别器件形成之后，例如对杂散光进行清零处理来排除干扰。具体的，是在指纹识别之前将光电传感器21接收到杂散光进行记录，即基于考虑到存在杂散光光强的情况下来计算以进行指纹的波谷、波脊差值的识别。
实施例3：
本实施例提供一种触摸显示面板，如图9所示，包括上述的指纹识别器件，还包括触摸显示基板，所述光波导结构22设于所述触摸显示基板的触摸显示面上，所述光电传感器21设于所述触摸显示基板的背离光波导结构22的一侧。
也就是说，本实施例中的触摸基板4为触摸显示基板，在此，以液晶触摸显示基板为例进行说明，参见图9，液晶层3在彩膜基板31与阵列基板32之间，光波导结构22设于彩膜基板31上，光电传感器21设于阵列基板32的靠近彩膜基板31的一侧，背光源33的光从波导材料24下面射入后，在介质材料23与波导材料24的界面进行多次全反射，然后传播至波导材料24的背离彩膜基板31的面上。这样，若指纹的波谷11与波导材料24的背离彩膜基板31的面接触，那么由于波谷11内为空气，光线全反射返回由光电传感器21识别；若指纹的波脊12与波导材料24的背离彩膜基板31的面接触，那么波脊12处光线发生漫反射从而不会往回反射以被光电传感器21识别，相当于提高了波脊12与波谷11处的识别差值，从而提高了光电传感器21对波谷11与波脊12识别准确率。
作为本实施例中的一种实施方案，如图10所示，所述触摸基板4为OLED，所 述OLED依次包括发光层51、封装层52和覆盖层53，所述指纹识别器件还包括缓冲层25，所述缓冲层25设于所述光波导结构22与触摸基板4之间，且构成所述缓冲层25的材料的折射率与构成所述封装层52的材料的折射率相同。
也就是说，光波导结构22中增加缓冲层25，缓冲层25的作用是折射率匹配，即缓冲层25的折射率等于封装层52的折射率，这样不会改变光线的传播方向，即从手指处反射下来的光线经过缓冲层25，覆盖层53到封装层52的传播方向不变。
在本公开的示例性实施例中，如图9所示，所述触摸显示基板包括像素区6和像素区6周边的非像素区，所述光电传感器21设于所述非像素区。
具体的，例如，OLED的非像素区为像素界定层(PDL)，像素区由发光层51构成，光电传感器21设置在PDL上方，这样不影响显示器件的开口率；若将OLED的发光点做小，根据模拟实验结果，发光点和光电传感器21的面积相等时，指纹识别的效果是优化的。
在本公开的示例性实施例中，如图11所示，所述指纹识别器件包括多个光波导结构22和多个光电传感器21，且所述光波导结构22与所述光电传感器21一一对应设置，具体地，例如，所述光波导结构22分别设置成与所述光电传感器21成一定角度，例如相同的角度；替代地，所述光波导结构22也例如分别设置成与所述光电传感器21在竖直方向上完全对准。
也就是说，光波导结构22例如是一整层，也例如是如图11所示仅在对应光电传感器21的位置处进行设置。
显然，上述各实施例的具体实施方式还能够进行许多变化；例如：光波导结构22中的波导材料24、介质材料23的具体材料例如根据具体产品进行选择。
实施例4：
本实施例提供一种触摸显示装置，其包括上述触摸显示面板。所述显示装置例如为：液晶显示面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
本公开实施例的指纹识别器件中包括光电传感器和设于触摸基板上的光波导结构，光波导结构包括间隔开而设置的介质材料和波导材料，光线由波导材料射入后，在介质材料与波导材料之间的界面进行多次全反射，然后传播至波导材料背离触摸基 板的面上。若指纹的波谷与波导材料背离触摸基板的面接触，那么由于波谷内为空气，光线全反射返回由光电传感器识别；若指纹的波脊与波导材料背离触摸基板的面接触，那么波脊处光线漫反射不会被光电传感器识别，相当于提高了波脊与波谷处的识别差值，从而提高了光电传感器对波谷与波脊识别准确率。本公开实施例的指纹识别器件适用于各种显示装置。
可以理解的是，以上实施方式仅仅是为了说明本公开实施例的原理而采用的示例性实施方式，然而本公开实施例并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开实施例的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开实施例的保护范围。

Claims (15)

  1. 一种指纹识别器件，其中，包括：光电传感器，以及光波导结构，所述光波导结构被布置于触摸基板上且被配置用以与指纹接触；所述光波导结构包括间隔开而设置的介质材料和波导材料，所述介质材料和波导材料的背离所述触摸基板的一面均被配置用于与指纹接触，以将从触摸基板射入到波导材料的光，在介质材料与波导材料之间的界面进行全反射后传播至所述波导材料背离触摸基板的面上。
  2. 根据权利要求1所述的指纹识别器件，其中，所述波导材料与触摸基板的界面为第一界面，所述波导材料与相邻的两个介质材料的界面分别为第二界面、第三界面，所述波导材料的背离触摸基板的面为第四界面；
    当指纹的波谷与光波导结构接触时，从所述第一界面射入到波导材料的光在第二界面、第三界面进行全反射后传播至第四界面，此后再次经第二界面、第三界面进行全反射返回以由光电传感器识别；
    当指纹的波脊与光波导结构接触时，由所述第一界面射入波导材料的光在第二界面、第三界面进行全反射传播至第四界面后出射不被光电传感器识别。
  3. 根据权利要求2所述的指纹识别器件，其中，所述第二界面、第三界面是均朝向第三界面和第二界面之一的一侧凸起的弧形面。
  4. 根据权利要求1所述的指纹识别器件，其中，所述波导材料的折射率为n2，所述介质材料折射率为n3，所述触摸基板的材料折射率为n1，其中，n3＜n2，n1＜n2。
  5. 一种触摸显示面板，其中，包括：
    根据权利要求1-4任一项所述的指纹识别器件，以及
    触摸显示基板，且
    其中，所述光波导结构设于所述触摸显示基板的触摸显示面上，所述光电传感器设于所述触摸显示基板的背离光波导结构的一侧。
  6. 根据权利要求5所述的触摸显示面板，其中，所述指纹识别器件包括多个光波导结构和多个光电传感器，且所述光波导结构与所述光电传感器一一对应。
  7. 根据权利要求5所述的触摸显示面板，其中，所述触摸显示基板包括像素区和像素区周边的非像素区，所述光电传感器设于所述非像素区。
  8. 根据权利要求5所述的触摸显示面板，其中，所述触摸显示基板为OLED，所述OLED包括依次设置的发光层、封装层和覆盖层，且所述指纹识别器件还包括缓冲层，所述缓冲层被布置于所述光波导结构与触摸显示基板之间，且被配置成使得构成所述缓冲层的材料的折射率与构成所述封装层的材料的折射率相同。
  9. 根据权利要求5所述的触摸显示面板，其中，所述触摸显示面板包括相对设置的彩膜基板和阵列基板，所述彩膜基板为触摸显示基板，所述光波导结构设于所述彩膜基板上，所述光电传感器设于阵列基板的靠近彩膜基板的一侧。
  10. 一种触摸显示装置，其中，包括权利要求5-9任一项所述触摸显示面板。
  11. 一种指纹识别器件的控制方法，其中，采用权利要求1、4任一项所述的指纹识别器件进行指纹识别，包括以下步骤：
    指纹识别器件与指纹接触，光电传感器根据接收的指纹处的反射光信号进行指纹识别。
  12. 一种指纹识别器件的控制方法，其中，采用权利要求2或3所述的指纹识别器件进行指纹识别，包括以下步骤：
    指纹识别器件与指纹接触，光电传感器根据接收的指纹处的反射光信号进行指纹识别。
  13. 根据权利要求12所述的指纹识别器件的控制方法，其中，射向所述第一界面的光与其法线的夹角为θ1，控制
    Figure PCTCN2017106844-appb-100001
    以使射向所述第一界面的光在第二界面、第三界面之间进行全反射后传播至所述第四界面，其中所述波导材料的折射率为n2，所述介质材料折射率为n3。
  14. 根据权利要求13所述的指纹识别器件的控制方法，其中，由所述第一界面射向第二界面的光与其法线的夹角为θ2，控制
    Figure PCTCN2017106844-appb-100002
    以使所述光电传感器接收到由第四界面再次经第二界面、第三界面进行全反射返回的光。
  15. 根据权利要求11或12所述的指纹识别器件的控制方法，还包括：在进行指纹识别之前，对光电传感器接收到的杂散光信号进行记录的步骤；并且
    其中，所述光电传感器根据接收的指纹处的反射光信号进行指纹识别包括将光电传感器实际接收的反射光信号减去杂散光信号后进行指纹识别。
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