WO2020177151A1 - Dispositif d'entrée d'empreinte digitale et dispositif d'affichage - Google Patents

Dispositif d'entrée d'empreinte digitale et dispositif d'affichage Download PDF

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Publication number
WO2020177151A1
WO2020177151A1 PCT/CN2019/078115 CN2019078115W WO2020177151A1 WO 2020177151 A1 WO2020177151 A1 WO 2020177151A1 CN 2019078115 W CN2019078115 W CN 2019078115W WO 2020177151 A1 WO2020177151 A1 WO 2020177151A1
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WO
WIPO (PCT)
Prior art keywords
light
layer
input device
fingerprint
fingerprint input
Prior art date
Application number
PCT/CN2019/078115
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English (en)
Chinese (zh)
Inventor
卓恩宗
刘振
Original Assignee
惠科股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 惠科股份有限公司 filed Critical 惠科股份有限公司
Publication of WO2020177151A1 publication Critical patent/WO2020177151A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • This application relates to a fingerprint input device and a display device.
  • Biometric fingerprint technology continues to develop in a highly secure network society. Due to mature technology, fingerprint recognition has been widely used in security, immigration and even financial authentication applications.
  • the mainstream of fingerprint sensing methods are capacitive and optical. Capacitive sensing technology uses capacitance difference to distinguish the ridges and valleys of the fingerprint. However, due to the sensing principle, crosstalk seriously interferes with the signal and causes poor image quality.
  • Optical-type sensing technologies generally provide better image quality, however, some applications of them are limited due to the huge volume of prisms and optical elements.
  • the exemplary fingerprint input device has a problem that crosstalk seriously interferes with the signal and causes poor image quality.
  • a fingerprint input device and a display device are provided.
  • a fingerprint input device including:
  • a microlens array layer arranged on the non-light source side of the light-emitting layer, the microlens array layer being arranged to focus the light reflected by the fingerprint onto the image sensor;
  • An image sensor arranged on the side of the microlens array layer away from the light-emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light.
  • the fingerprint input device further includes an encapsulation layer disposed on the light-emitting layer.
  • the fingerprint input device further includes a transparent cover plate arranged on the packaging layer, and the transparent cover plate has a fingerprint contact surface.
  • the light-emitting layer includes:
  • a drive backplane arranged on the microlens array layer
  • a light-emitting unit arranged on the drive backplane.
  • the driving backplane includes a light-transmitting area and a non-light-transmitting area; the light reflected by the fingerprint is incident on the microlens array layer through the light-transmitting area.
  • the driving backplane includes a substrate and a pixel array arranged on the substrate, and a color filter is attached to the pixel array.
  • the color filter includes color resists corresponding to red, green, blue, and white, respectively.
  • the light-emitting unit includes a first electrode and a second electrode that are oppositely disposed, and an organic light-emitting layer disposed between the first electrode and the second electrode.
  • the light emitting unit includes an anode, a hole injection layer, a first hole transport layer, a blue light emitting layer, a first electron transport layer, a first electron injection layer, an intermediate connector, and a Two hole transport layer, red light and green light emitting layer, second electron transport layer, second electron injection layer and cathode.
  • the microlens array layer includes a microlens array that is convex toward the light-emitting layer.
  • the microlens in the microlens array includes a light-transmitting medium portion provided on the image sensor and a lens portion provided on the light-transmitting medium portion.
  • the focal plane of the lens part is on the image sensor.
  • the convex surface of the lens portion includes a circular shape or an elliptical shape.
  • the refractive index of the material of the light-transmitting medium part is smaller than the refractive index of the material of the lens part.
  • the thickness of the microlens array layer is 10 ⁇ m-500 ⁇ m.
  • the image sensor includes a phototransistor sensor layer and a sensor pixel array.
  • the phototransistor sensor layer includes a-Si TFT phototransistor sensor
  • the sensor pixel array includes a-Si TFT pixels.
  • a fingerprint input device including:
  • a microlens array layer arranged on the non-light source side of the light-emitting layer, the microlens array layer being arranged to focus light reflected by fingerprints onto the image sensor;
  • An image sensor arranged on the side of the microlens array layer away from the light-emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light;
  • the light-emitting layer includes a driving backplane disposed on the microlens array layer and a light-emitting unit disposed on the driving backplane;
  • the driving backplane includes a light-transmitting area and a non-light-transmitting area, fingerprint reflection The light is incident on the microlens array layer through the light-transmitting area;
  • the microlens array layer includes a microlens array that is convex toward the light-emitting layer;
  • the image sensor includes a phototransistor sensor layer and a sensor pixel array, the phototransistor sensor layer includes a-Si TFT phototransistor sensor, and the sensor pixel array includes a-Si TFT pixels.
  • a display device includes the fingerprint input device as described above.
  • FIG. 1 is a schematic diagram of a fingerprint input device according to an embodiment
  • FIG. 2 is a schematic diagram of the structure of a light-emitting layer of the fingerprint input device corresponding to FIG. 1;
  • FIG. 3 is a schematic structural diagram of a driving backplane corresponding to the light-emitting layer of FIG. 2;
  • FIG. 4 is a schematic diagram of the structure of a light-emitting unit corresponding to the light-emitting layer of FIG. 2;
  • FIG. 5 is a schematic structural diagram of another light-emitting unit corresponding to the light-emitting layer of FIG. 2;
  • FIG. 6 is a schematic diagram of a partial structure of the fingerprint input device corresponding to FIG. 1;
  • FIG. 7 is a schematic diagram of a partial structure of the fingerprint input device corresponding to FIG. 1;
  • FIG. 8 is a schematic structural diagram of a fingerprint input device according to another embodiment.
  • Fig. 1 is a schematic diagram of the structure of the fingerprint input device in this embodiment.
  • the fingerprint input device 10 includes a light-emitting layer 110, a microlens array layer 120 disposed on the non-light source side of the light-emitting layer 110, and an image sensor 130 disposed on the side of the microlens array layer 120 away from the light-emitting layer 110.
  • the light emitting layer 110 is arranged to emit light having one or more colors on the light emitting side. Specifically, the light emitted from the light-emitting layer 110 is incident on the sensing surface of the fingerprint contact area, the incident light is reflected back by the fingerprint, and the reflected light is focused on the image sensor 130 through the microlens array layer 120.
  • the light source includes, but is not limited to, one or more of near-ultraviolet light, violet light, blue light, green light, yellow light, red light, near-infrared light, or white light, depending on the actual setting of the light-emitting layer 110 , The color of the light may also be different.
  • the light emitting layer 110 may have a single layer structure or a combination of multiple layers, for example, a display panel.
  • the light emitting layer 110 may include a driving backplane 111 disposed on the microlens array layer 120 and a light emitting unit 112 disposed on the driving backplane.
  • the driving backplane 111 includes a light-transmitting area and a non-light-transmitting area, and the light-transmitting area and the non-light-transmitting area appear alternately.
  • the width of each light-transmitting area may be equal or unequal; the width of each non-light-transmitting area may also be equal or unequal.
  • the light reflected by the fingerprint can be focused on the microlens array layer 120 through the light-transmitting area.
  • the driving backplane 111 includes a substrate 111a and a pixel array 111b disposed on the substrate 111a.
  • the pixel array 111b is disposed in a non-transmissive area of the driving backplane 111, and the pixel array 111b is attached with
  • the color filter 111c, the color filter 111c includes color resists corresponding to red (R), green (G), blue (B) and white (W) respectively, and the light-emitting unit is driven by the pixel array 111b and the color filter 111c 112 full color.
  • the pixel array 111b is a TFT (Thin Film Transistor) pixel array.
  • the light-emitting unit 112 may be an OLED (Organic Light-Emitting Diode) device, a QLED (Quantum Dot Light Emitting Diodes, quantum dot light-emitting diode) device, or a TFT-LCD (Thin film transistor-liquid crystal display) device. Liquid crystal display) One of the liquid crystal display devices. Specifically, the light-emitting unit 112 may also be an AMOLED (Active-matrix organic light emitting diode) device. Take an OLED device as an example.
  • the light emitting unit 112 includes a first electrode 112a and a second electrode 112b disposed oppositely, and one or more organic light emitting layers 112c disposed between the first electrode 112a and the second electrode 112b (Fig. 4 shows an organic The light-emitting layer is an example).
  • the first electrode 112a is an anode
  • the second electrode 112b is a cathode
  • the light-emitting unit 112 is a top-emitting device.
  • the organic light-emitting layer 112c may include one or both of a red-green light-emitting layer and a blue light-emitting layer.
  • the light-emitting unit 112 may also add corresponding functional layers.
  • the light-emitting unit 112 may include an anode 1121, a hole injection layer 1122, and a first Hole transport layer 1123, blue light emitting layer 1124, first electron transport layer 1125, first electron injection layer 1126, intermediate connector 1127, second hole transport layer 1128, red and green light emitting layer 1129, second electron transport The layer 1130, the second electron injection layer 1131, and the cathode 1132.
  • the microlens array layer 120 is disposed on the non-light source side of the light-emitting layer 110, and receives the light reflected by the fingerprint passing through the light-transmitting area of the driving back plate 111.
  • the microlens array layer 120 includes a microlens array that is convex toward the light-emitting layer 110 to collect the light reflected by the fingerprint.
  • the microlens array can be directly integrated on the image sensor 130, so there is no need to add an additional support layer in the image sensor 130, which reduces the cost of the image sensor 130. Referring to FIG.
  • each microlens in the microlens array may include a light-transmitting medium part 121 provided on the image sensor 130 and a lens part 122 provided on the light-transmitting medium part 121.
  • the focal plane of the lens portion 122 is located on the pixel array of the image sensor 130, and the convex surface of the lens portion 122 includes but is not limited to a circular shape and an elliptical shape.
  • the lens portion 122 When the light emitted from the light-emitting layer 110 is reflected on the fingerprint contact surface, the lens portion 122 focuses the light reflected by the fingerprint onto the pixel array of the image sensor 130, thereby reducing crosstalk between pixels, improving the directivity of light, and enhancing the light at the same time
  • the strength of the image sensor 130 enables the image sensor 130 to detect and generate high-quality image information corresponding to the fingerprint.
  • the refractive index of the material of the light-transmitting medium portion 121 is smaller than the refractive index of the material of the lens portion 122, so as to ensure that each lens portion 122 fully exerts a light-gathering function.
  • the thickness of the light-transmitting medium portion 121 is set according to the distance between the convex surface of the lens portion 122 and the light-emitting layer 110, the radius of curvature of the lens portion 122, the focal length of the lens portion 122, and the refractive index of the material of the lens portion 122.
  • the thickness of the light-transmitting medium portion 121 should be kept as thin as possible, and even the light-transmitting medium portion 121 can be zero.
  • the microlens array layer 120 may be 10 ⁇ m-500 ⁇ m, so as to ensure that it can play a corresponding light gathering function while avoiding the thickness of the entire fingerprint input device from being too large.
  • the image sensor 130 is configured to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint based on the reflected light.
  • the light emitted by the light-emitting layer 110 is used as a light source.
  • the image sensor 130 uses the read signal strength to reconstruct the shape of the fingerprint.
  • the image sensor 130 includes a phototransistor sensor array 131 and a sensor pixel array 132.
  • the sensor pixel array 132 senses light reflected by the fingerprint, and the phototransistor sensor array 131 generates image information corresponding to the fingerprint according to the reflected light. .
  • each pixel in the sensor pixel array 132 can be selected and set according to actual product requirements. Multiple sensor pixels can be arranged in a matrix. The number of sensor pixels may correspond to the number of microlenses. In one embodiment, one sensor pixel corresponds to one microlens.
  • the sensor pixel array 132 can be arranged on the phototransistor sensor array 131 (as shown in FIG. 7), and the arrangement of each pixel corresponds specifically to the projection position of the light-transmitting part of the driving backplane 131, so that it can pass through the microlens array layer 120 Receive the reflected light.
  • the sensor pixel array 132 may also be arranged on the substrate in parallel with the phototransistor sensor array 131.
  • the phototransistor sensor array 131 includes a-Si TFT phototransistor sensors, and the sensor pixel array 132 includes a-Si TFT pixels.
  • the image sensor 130 has high optical utilization, thereby improving the quality of light information transmission.
  • the phototransistor sensor array 131 includes a-Si:H TFT phototransistor sensors, and the sensor pixel array 132 includes a-Si:H TFT pixels.
  • the image sensor 130 has higher optical utilization, thereby improving light The quality of information delivery.
  • the fingerprint input device includes a light-emitting layer 110, a microlens array layer 120 arranged on the non-light source side of the light-emitting layer 110, and an image sensor 130 arranged on the side of the microlens array layer 120 away from the light-emitting layer 110, which emits light
  • the light emitted from the layer 110 is reflected back by the fingerprint, and the reflected light is focused on the pixel array of the image sensor 130 through the microlens array layer 120, thereby reducing crosstalk between pixels, improving the directivity of light, and enhancing the intensity of light at the same time
  • the utilization of light energy is improved, and the image sensor 120 can detect and generate high-quality image information corresponding to fingerprints.
  • the fingerprint input device 20 includes a light-emitting layer 210, a microlens array layer 220 arranged on the non-light source side of the light-emitting layer 210, and a microlens array layer.
  • the image sensor 230 on the side facing away from the light-emitting layer 210, the encapsulation layer 240 provided on the light-emitting layer 210, and the transparent cover 250 provided on the encapsulation layer 240.
  • the light-emitting layer 210 the microlens array layer 220, and the image sensor 230, refer to the related descriptions of the light-emitting layer 110, the microlens array layer 120, and the image sensor 130 in the previous embodiment, which will not be repeated here.
  • the fingerprint input device further includes a device disposed on the light-emitting layer 210 Encapsulation layer 240.
  • the encapsulation layer 240 is a light-transmitting layer, which may be a single-layer structure or a stack of multiple layers; it may be a substrate or a film.
  • the material of the encapsulation layer 240 is not limited.
  • it may be an inorganic material layer, including but not limited to silicon oxide, silicon nitride, etc., which may serve as an effective water/oxygen barrier layer; it may also be an organic material layer, including but not limited to Materials such as high molecular polymers and resins can be used as flexible packaging layers.
  • the fingerprint input device 20 further includes a transparent cover 250 disposed on the packaging layer 240 to protect the light emitting layer 210, the microlens array layer 220, and the image sensor 230.
  • the transparent cover has a fingerprint contact surface, which can directly contact the fingerprint ridge area.
  • the fingerprint input device includes a light-emitting layer 210, a microlens array layer 220, an image sensor 230, an encapsulation layer 240, and a transparent cover 250.
  • the light emitted by the light-emitting layer 210 is reflected back by the fingerprint, and the reflected light passes through the micro
  • the lens array layer 220 focuses on the pixel array of the image sensor 230, thereby reducing crosstalk between pixels, improving the directivity of light, and at the same time enhancing the intensity of light and improving the utilization of light energy.
  • the image sensor 220 can detect and generate fingerprints. Corresponding high-quality image information; at the same time, the encapsulation layer 240 and the transparent cover 250 can further isolate the influence of the environment on the fingerprint input device 20, improve the stability and safety of the fingerprint input device 20, and increase the service life.
  • This embodiment also provides a display device, which includes the fingerprint input device as described in the above embodiment.
  • the display device provided in this embodiment can display high-quality image information corresponding to fingerprints.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

La présente invention se rapporte à un dispositif d'entrée d'empreinte digitale et à un dispositif d'affichage. Le dispositif d'entrée d'empreintes digitales comprend une couche électroluminescente ; une couche de réseau de microlentilles disposée sur le côté qui n'est pas source lumineuse de la couche électroluminescente, ladite couche de réseau de microlentilles étant configurée pour focaliser la lumière réfléchie par l'empreinte digitale sur un capteur d'image ; et le capteur d'image disposé sur la couche de réseau de microlentilles sur le côté opposé à la couche électroluminescente, ledit capteur d'image étant configuré pour détecter la lumière réfléchie par l'empreinte digitale et pour générer, en fonction de la lumière réfléchie, des informations d'image correspondant à l'empreinte digitale.
PCT/CN2019/078115 2019-03-01 2019-03-14 Dispositif d'entrée d'empreinte digitale et dispositif d'affichage WO2020177151A1 (fr)

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CN201910154709.XA CN109977785A (zh) 2019-03-01 2019-03-01 指纹输入装置
CN201910154709.X 2019-03-01

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CN111414901A (zh) * 2019-08-26 2020-07-14 神盾股份有限公司 指纹感测模块与电子装置
CN110728266A (zh) * 2019-10-30 2020-01-24 维沃移动通信（杭州）有限公司 显示模组及电子设备
TWI704500B (zh) * 2019-11-14 2020-09-11 宏碁股份有限公司 指紋感測裝置以及指紋感測方法
CN112989885A (zh) * 2019-12-16 2021-06-18 北京小米移动软件有限公司 显示面板、显示屏、终端设备及显示面板的制作方法

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