CN108734073B - Detection device and terminal equipment - Google Patents
Detection device and terminal equipment Download PDFInfo
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- CN108734073B CN108734073B CN201710643113.7A CN201710643113A CN108734073B CN 108734073 B CN108734073 B CN 108734073B CN 201710643113 A CN201710643113 A CN 201710643113A CN 108734073 B CN108734073 B CN 108734073B
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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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Abstract
A detection device and terminal equipment are used for improving the accuracy of optical identification under a display screen. One of the detection devices includes: the light-emitting component is used for emitting initial light; the control component is used for controlling the propagation direction of feedback light emitted from the display screen with light transmittance so as to form imaging light, wherein the feedback light is reflected by lines on one surface of an object, which is close to or contacted with the display screen, under the irradiation of the initial light when the object is close to or contacted with the display screen; and the image sensor is used for forming data of images used for representing lines of one surface of the object, which is close to or contacted with the display module, by receiving the imaging light rays.
Description
The present application claims priority from the chinese patent office, application number 201710245989.6, chinese patent application entitled "a fingerprint identification method and apparatus" filed on 14 th month 2017, the entire contents of which are incorporated herein by reference.
Technical Field
The embodiment of the application relates to the technical field of electronics, in particular to a detection device and terminal equipment.
Background
In recent years, terminal equipment with a biological recognition function gradually enters life and work of people, wherein fingerprints are valued by people because the fingerprints can uniquely represent identity features of the people, and along with the development of full-screen terminal equipment, the fingerprint recognition technology under a display screen of the terminal equipment is more focused by people in the future.
At present, fingerprint identification technologies applicable to a display screen include optical technologies, capacitive technologies, ultrasonic technologies and the like, and among them, optical technologies are favored because of the advantages of good durability and low cost. However, with optical technology, since the light sources emit initial light rays in different directions, when there are a plurality of light sources, the light rays emitted from the display screen to the image sensor overlap each other, and thus the image sensor is blurred. For example, referring to fig. 1, initial light rays emitted from different light sources in the plurality of light sources are irradiated onto one surface of the object through the display screen, reflected light rays are formed after reflection by the object, and emergent light rays formed by the reflected light rays at different positions on one surface of the object through the display screen may be irradiated onto the same position on the image sensor.
Therefore, the recognition accuracy of the optical recognition technology under the display screen in the prior art is low.
Disclosure of Invention
The embodiment of the application provides a detection device and terminal equipment, which are used for improving the accuracy of optical identification under a display screen.
In a first aspect, an embodiment of the present application provides a detection apparatus, including: the light-emitting component is used for emitting initial light;
The control component is used for controlling the propagation direction of feedback light emitted from the display screen with light transmittance so as to form imaging light, wherein the feedback light is reflected by lines on one surface of an object, which is close to or contacted with the display screen, under the irradiation of the initial light when the object is close to or contacted with the display screen; and the image sensor is used for forming data of images used for representing lines of one surface of the object, which is close to or contacted with the display module, by receiving the imaging light rays.
In the embodiment of the application, the transmission direction of the feedback light is controlled by the control component, so that crosstalk generated between different feedback light can be eliminated, and imaging light is formed. Therefore, the image sensor can form data for representing images with clear lines after receiving imaging light, more accurate line detection is realized, and the accuracy of optical identification under the display screen is improved.
In one possible design, the control assembly includes: a lens array for converging the feedback light to form a transmitted light incident on the image sensor; and the light guide assembly is arranged between the lens array and the image sensor and is used for eliminating crosstalk between transmitted light rays emitted from each lens in the lens array.
In the embodiment of the application, after the lens array converges the feedback light, the light guide component eliminates crosstalk generated between the transmitted light rays emitted from each lens in the lens array to form imaging light rays. Therefore, the image sensor can form data for representing images with clear lines after receiving imaging light, more accurate line detection is realized, and the accuracy of optical identification under the display screen is improved.
In one possible design, the light guide assembly includes: the light-proof layer is stacked in the vertical direction, each light-proof layer in the N light-proof layers is provided with a through hole array, the positions of the through hole arrays arranged on each light-proof layer are completely overlapped, each through hole array comprises a first through hole and a second through hole which penetrate through each light-proof layer, and N is an integer; and a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
In the embodiment of the application, each opaque layer can be a silicon substrate or can be a layer with other structures, for example, each opaque layer comprises a first sub-layer and a second sub-layer evaporated on the upper surface of the first sub-layer; the material of the first sub-layer is a material with light transmittance, such as plastic with light transmittance, or glass, and the material of the second sub-layer is a material without light transmittance, such as a film without light transmittance, and may be a metal film, a black polyester film (Polyseter Film, PET) or a black glue layer.
In the embodiment of the application, a through hole array is arranged on each opaque layer, and then the opaque layers provided with the through hole arrays are bonded to form the light guide assembly. Because the thickness of each opaque layer is thinner, the punching difficulty is lower when punching is performed in a laser, machining embossing, or unprocessed mode, and the like, so that mass production can be realized.
In one possible design, the N is obtained by rounding up the function obtained value according to the duty cycle; wherein the duty cycle is a function of 1 and the inverse of the difference between the duty cycles, the duty cycle being the ratio of the diameter of the lenses in the lens array to the period of the lenses of the lens array.
In the embodiment of the application, the number of layers of the required opaque layer is determined according to the duty cycle, that is, the duty cycle of the lenses in the lens array.
In one possible design, the light guide assembly includes: the light-proof layer is provided with a through hole array, and the through hole array comprises a first through hole and a second through hole which penetrate through the light-proof layer; and a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
In the embodiment of the application, the through hole array is arranged on the opaque layer, and the first through holes and the second through holes in the through hole array are separated, so that the light blocking effect is realized, and the crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens can be eliminated.
In one possible design, the thickness of the opaque layer is less than or equal to a vertical distance between the optical center of the lenses in the lens array and the image sensor, so that the transmitted light rays exiting the first lenses of the lens array exit to a first area on the image sensor where the projection of the first through holes is located through the first through holes, and the transmitted light rays exiting the second lenses of the lens array exit to a second area on the image sensor where the projection of the second through holes is located through the second through holes.
In the embodiment of the application, the thickness of the light-tight layer is set to be smaller than or equal to the vertical distance between the optical center of the lenses in the lens array and the image sensor, so that the transmitted light rays emitted from the first lenses are prevented from being emitted to the second area through the first through holes and/or the emitted light rays transmitted from the second lenses are prevented from being emitted to the first area through the second through holes, and crosstalk generated between the transmitted light rays transmitted from the lenses can be further eliminated.
In one possible design, the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens.
In the embodiment of the application, the aperture of each through hole in the through hole array is smaller than or equal to the diameter of the lens corresponding to each through hole in the lens array, for example, the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens, so as to avoid crosstalk between the transmitted light transmitted by the second lens and the transmitted light transmitted by the first through hole and the transmitted light transmitted by the second through hole.
In one possible design, the light guide assembly is a fiber optic panel, and the numerical aperture of the fiber optic panel is smaller than a preset value, so that the fiber optic panel receives the transmitted light rays emitted from the lens array within a preset angle range, and cross talk between the transmitted light rays emitted from the first lens of the lens array and the transmitted light rays emitted from the second lens of the lens array is eliminated; wherein the preset value is the ratio of the diameter of the lenses in the lens array to the distance between the lens array and the fiber optic panel.
In the embodiment of the application, the numerical aperture of the optical fiber panel is smaller than a preset value, so that the optical fiber panel is ensured to receive the transmitted light rays within a preset angle range emitted from the lens array, and the crosstalk generated between different transmitted light rays can be eliminated.
In one possible design, the light emitting assembly is a light source disposed outside the display screen;
The detection device further includes:
And the collimation assembly is used for controlling the initial light rays emitted by different light sources included in the light-emitting assembly to irradiate different areas on one surface of the object.
In the embodiment of the application, the crosstalk generated between the light rays can be better eliminated by controlling the feedback light rays through the light guide assembly further through the irradiation range of the collimation assembly on the initial light rays emitted by different light sources included in the light emitting assembly.
In one possible design, the collimation assembly includes:
and a light transmitting portion disposed between adjacent light blocking portions for blocking the initial light from being irradiated onto the pixel electrodes of the display screen to control the initial light from the light transmitting portion to be irradiated onto different areas on one face of the object from a gap between the adjacent pixel electrodes.
In the embodiment of the application, the light blocking part blocks the initial light from irradiating the pixel electrode of the display screen, so that the incidence angle of the initial light is limited, the initial light is prevented from being reflected back after irradiating the back surface of the pixel electrode and cannot irradiate one surface of the object, and the irradiation emissivity of the initial light on one surface of the object is improved.
In a second aspect, an embodiment of the present application provides a detection apparatus, where the detection apparatus includes a control component, configured to control a propagation direction of a feedback light emitted from a display screen having light transmittance, so as to form an imaging light, where the feedback light is a light reflected by a line on a surface of an object that is close to or contacts the display screen under irradiation of an initial light emitted by the display screen when the object is close to or contacts the display screen; and the image sensor is used for forming data of images used for representing lines of one surface of the object, which is close to or contacted with the display module, by receiving the imaging light rays.
In the embodiment of the application, the transmission direction of the feedback light is controlled by the control component, so that crosstalk generated between different feedback light can be eliminated, and imaging light is formed. Therefore, the image sensor can form data for representing images with clear lines after receiving imaging light, more accurate line detection is realized, and the accuracy of optical identification under the display screen is improved.
In one possible design, the control assembly includes: a lens array for converging the feedback light to form a transmitted light incident on the image sensor; and the light guide assembly is arranged between the lens array and the image sensor and is used for eliminating crosstalk between transmitted light rays emitted from each lens in the lens array so as to form imaging light rays.
In the embodiment of the application, after the lens array converges the feedback light, the light guide component eliminates crosstalk generated between the transmitted light rays emitted from each lens in the lens array to form imaging light rays. Therefore, the image sensor can form data for representing images with clear lines after receiving imaging light, more accurate line detection is realized, and the accuracy of optical identification under the display screen is improved.
In one possible design, the light guide assembly includes: the light-proof layer is stacked in the vertical direction, each light-proof layer in the N light-proof layers is provided with a through hole array, the positions of the through hole arrays arranged on each light-proof layer are completely overlapped, each through hole array comprises a first through hole and a second through hole which penetrate through each light-proof layer, and N is an integer; and a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
In the embodiment of the application, each opaque layer can be a silicon substrate or can be a layer with other structures, for example, each opaque layer comprises a first sub-layer and a second sub-layer which is attached to the upper surface of the first sub-layer; the material of the first sub-layer is a material with light transmittance, such as plastic with light transmittance, or glass, and the material of the second sub-layer is a material without light transmittance, such as a film without light transmittance, and may be a metal film, a black polyester film (Polyseter Film, PET) or a black glue layer.
In the embodiment of the present application, the second sub-layer may be evaporated on the upper surface of the first sub-layer by evaporation, or may be disposed on the upper surface of the first sub-layer by using a mask plate, which is not limited in the embodiment of the present application.
In the embodiment of the application, a through hole array is arranged on each opaque layer, and then the opaque layers provided with the through hole arrays are bonded to form the light guide assembly. Because the thickness of each opaque layer is thinner, the punching difficulty is lower when punching is performed in a laser, machining embossing, or unprocessed mode, and the like, so that mass production can be realized.
In one possible design, the N is obtained by rounding up the function obtained value according to the duty cycle; wherein the duty cycle is a function of 1 and the inverse of the difference between the duty cycles, the duty cycle being the ratio of the diameter of the lenses in the lens array to the period of the lenses of the lens array.
In the embodiment of the application, the number of layers of the required opaque layer is determined according to the duty cycle, that is, the duty cycle of the lenses in the lens array.
In one possible design, the light guide assembly includes: the light-proof layer is provided with a through hole array, and the through hole array comprises a first through hole and a second through hole which penetrate through the light-proof layer; and a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
In the embodiment of the application, the through hole array is arranged on the opaque layer, and the first through holes and the second through holes in the through hole array are separated, so that the light blocking effect is realized, and the crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens can be eliminated.
In one possible design, the thickness of the opaque layer is less than or equal to a vertical distance between the optical center of the lenses in the lens array and the image sensor, so that the transmitted light rays exiting the first lenses of the lens array exit to a first area on the image sensor where the projection of the first through holes is located through the first through holes, and the transmitted light rays exiting the second lenses of the lens array exit to a second area on the image sensor where the projection of the second through holes is located through the second through holes.
In the embodiment of the application, the thickness of the light-tight layer is set to be smaller than or equal to the vertical distance between the optical center of the lenses in the lens array and the image sensor, so that the transmitted light rays emitted from the first lenses are prevented from being emitted to the second area through the first through holes and/or the emitted light rays transmitted from the second lenses are prevented from being emitted to the first area through the second through holes, and crosstalk generated between the transmitted light rays transmitted from the lenses can be further eliminated.
In one possible design, the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens.
In the embodiment of the application, the aperture of each through hole in the through hole array is smaller than or equal to the diameter of the lens corresponding to each through hole in the lens array, for example, the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens, so as to avoid crosstalk between the transmitted light transmitted by the second lens and the transmitted light transmitted by the first through hole and the transmitted light transmitted by the second through hole.
In one possible design, the light guide assembly is a fiber optic panel, and the numerical aperture of the fiber optic panel is smaller than a preset value, so that the fiber optic panel receives the transmitted light rays emitted from the lens array within a preset angle range, and cross talk between the transmitted light rays emitted from the first lens of the lens array and the transmitted light rays emitted from the second lens of the lens array is eliminated; wherein the preset value is the ratio of the diameter of the lenses in the lens array to the distance between the lens array and the fiber optic panel.
In the embodiment of the application, the numerical aperture of the optical fiber panel is smaller than a preset value, so that the optical fiber panel is ensured to receive the transmitted light rays within a preset angle range emitted from the lens array, and the crosstalk generated between different transmitted light rays can be eliminated.
In a third aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a display screen having light transmittance; the detecting device of the first aspect, which is configured to obtain data representing an image of a texture on a surface of an object that is in proximity to or in contact with the detecting device when the object is in proximity to or in contact with the detecting device; and a processor coupled to the detection device for converting the data of the image into the image and identifying whether the image is a set image.
In a fourth aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a display screen having light transmittance; the detecting device according to the second aspect, for obtaining data representing an image of a texture of a face of an object that is brought into proximity or contact with the display screen when the object is brought into proximity or contact with the display screen; and a processor coupled to the detection device for converting the data of the image into the image and identifying whether the image is a set image.
Drawings
FIG. 1 is a schematic diagram of an optical texture imaging blur in the prior art;
fig. 2 is a schematic structural diagram of a detection device according to an embodiment of the present application;
fig. 3 is a schematic diagram of a light emitting component in a detection device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a display screen in a detection device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a collimation assembly in a detection device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a light guide assembly in a detection device according to an embodiment of the present application;
Fig. 7 is a schematic diagram of another structure of a light guide assembly in a detection device according to an embodiment of the present application;
Fig. 8 is a schematic diagram of a light transmission path when the light guide assembly is an optical fiber panel in the detection device according to the embodiment of the present application;
Fig. 9 is another schematic structural diagram of a light guide assembly in a detection device according to an embodiment of the present application;
fig. 10 is a schematic diagram of another structure of a light guide assembly in a detection device according to an embodiment of the present application;
FIG. 11 is a schematic structural diagram of another detecting device according to an embodiment of the present application;
Fig. 12 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of another terminal device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.
In a first aspect, referring to fig. 2, an embodiment of the present application provides a detection apparatus for implementing more accurate identification. The detection device comprises:
a light emitting assembly 200 for emitting an initial light;
the control component 201 is configured to control a propagation direction of a feedback light emitted from a display screen with light transmittance, so as to form an imaging light, where the feedback light is a light reflected by a line on a surface of an object, which is close to or contacts the display screen, under irradiation of an initial light when the object is close to or contacts the display screen;
The image sensor 202 is configured to form data representing an image of a texture of a surface of the object near or contacting the display module by receiving the imaging light.
In the embodiment of the application, the control component 201 controls the propagation direction of the feedback light, so that crosstalk generated between different feedback lights can be eliminated, and the image sensor 202 can form data for representing an image with clearer lines after receiving imaging light, thereby realizing more accurate line detection and improving the accuracy of optical identification under a display screen.
In an embodiment of the present application, the light emitting assembly 200 is a light source disposed outside the display screen. The light emitting assembly 200 may be an array light source provided in an area directly below the lower surface of the display screen, and the array light source may be composed of an LED light source, a laser light source, or an infrared light source. In the embodiment of the present application, the area where the array light sources are disposed, that is, the area on the detecting device for detecting the texture, in which the light sources are arranged at equal intervals to form an array, for example, a 5×4 array, please refer to fig. 3.
In the embodiment of the application, the display screen has light transmittance, and when one surface of the object is close to or contacts with the upper surface of the display screen, the initial light emitted by the light emitting component 200 can penetrate through the display screen to irradiate on one surface of the object, and the reflected light formed by the reflection of the object penetrates through the display screen to form the feedback light of the lines on one surface of the object. The display screen may be an Organic Light-emitting diode (OLED), a Light-emitting diode (LED) Emitted Diode, a Flexible OLED (FOLED), or the like.
Referring to fig. 4, the display screen takes an OLED as an example, and the whole structure layer includes: a cover glass 400; the polaroid 401 is adhered to the cover glass 400 through optical cement; the packaging glass 402 is arranged on the lower surface of the polaroid 401 in a bonding manner; a cathode 403 disposed on the lower surface of the encapsulation glass 400; a light emitting layer 404 disposed on the lower surface of the cathode 403; an anode 405 provided on the lower surface of the light emitting layer 404, and a base glass 406, wherein the intersection of the cathode 403 and the anode 405 forms pixels, and an electrode pair composed of the cathode 403 and the anode 405 at a position corresponding to each pixel is a pixel electrode with a gap between adjacent pixel electrodes.
Referring to fig. 5, since each of the array light sources emits the initial light in a different direction, in order to reduce the scattering of the initial light, in an embodiment of the present application, the detecting apparatus further includes a collimation assembly 500 for controlling the irradiation range of the initial light. Wherein, after the initial light is processed by the collimating component 500, the initial light incident on the display screen from the predetermined angle range can be obtained, that is, the initial light is controlled to irradiate on the area covered by the predetermined angle range on one surface of the object. For example, taking a first light source and a second light source in the array light source as an example, initial light emitted by the first light source is processed by the collimating component 500 and then enters the display screen from a predetermined angle range, and irradiates a first area on one surface of an object, initial light emitted by the second light source is processed by the collimating component 500 and then enters the display screen from a predetermined angle range, irradiates a second area on one surface of the object, and the first area and the second area are not overlapped.
In an embodiment of the present application, the collimating assembly 500 includes a light transmitting portion and a light blocking portion. Implementations of the light transmitting portion and the light blocking portion include, but are not limited to, the following two, respectively, described below.
In the mode a, a light blocking layer is disposed on the lower surface of the display screen, and an array of through holes is disposed on the light blocking layer, wherein the through holes are light transmitting portions, and other portions of the light blocking layer except for the through holes are light blocking portions, that is, in the mode a, the collimating component 500 includes a light blocking layer and an array of through holes disposed on the light blocking layer. The initial light irradiates different areas on one surface of the object through the display screen through the through holes in the through hole array and the gaps between the adjacent pixel electrodes corresponding to the through holes.
In the embodiment of the present application, the light blocking layer may be made of a light-impermeable material, such as a black plastic film, a silicon wafer, or a metal sheet.
In the mode B, the light blocking blocks are arranged on the lower surface of the display screen, wherein the light blocking blocks are light blocking portions, and gaps between adjacent light blocking blocks are light transmitting portions, that is, in the mode B, the collimating assembly 500 comprises the light blocking blocks and the gaps between the adjacent light blocking blocks. The initial light irradiates different areas on one surface of the object through the display screen through gaps between adjacent pixel electrodes corresponding to the gaps between the adjacent light-blocking blocks.
In the embodiment of the application, the pixel electrode of the display screen has strong opacity, and the back surface of the pixel electrode, namely the surface of the pixel electrode facing the lower surface of the display screen, has strong reflectivity, namely the initial light rays irradiated to the back surface of the pixel electrode can be reflected strongly, so that the light blocking parts are formed at the pixel electrode, the initial light rays are incident from the light transmitting parts between the adjacent light blocking parts, the incident angle of the incident light rays is limited, the initial light rays are prevented from being reflected back after being irradiated to the back surface of the pixel electrode, and the irradiation rate of the initial light rays irradiated to one surface of an object is improved.
In the embodiment of the present application, the initial light irradiates one surface of the object, and the reflected light formed after being reflected by the object passes through the display screen to form the feedback light, and because crosstalk may occur between the feedback light, in order to avoid crosstalk between the feedback light, the propagation direction of the feedback light is controlled by the control component 201 to form the imaging light.
In an embodiment of the present application, the control assembly 201 includes:
A lens array for converging the feedback light to form a transmitted light incident on the image sensor 202;
a light guide assembly is disposed between the lens array and the image sensor 202 for eliminating crosstalk between transmitted light rays exiting each lens in the lens array to form imaging light rays.
In an embodiment of the present application, the lens array is used to focus the received feedback light. In the specific implementation process, as the terminal equipment is increasingly thinned, the volume of the detection device is limited, and if the thickness of the detection device is to be ensured to be within a certain range, the thickness of the lens is also to be within a certain range. When the thickness of the lens is fixed, the shorter the focal length of the lens is, the smaller the diameter of the lens is, and then the smaller the diameter of the lens is, the smaller the angle range of the lens for receiving emergent light is, and in order to ensure that the emergent light of any angle emergent from the display screen can be received and converged, a lens array is required to be arranged. In the embodiment of the application, the gaps between adjacent lenses in the lens array are the same, the diameter of each lens in the lens array is the same, and the focal length of each lens is the same.
In the embodiment of the present application, the diameter of each lens included in the lens array is within a preset diameter range, for example, the preset diameter range is [5 micrometers (um), 600um ], where the diameter of the lens may specifically be 50um in consideration of the processing precision of the lens and the resolution of the image. The focal length of each lens included in the lens array is within a preset focal length range, for example, the preset focal length range is [20um,800um ], wherein the focal length of the lens can be specifically 50um in consideration of the processing precision of the lens and the resolution of the image. The lens array may include a lens made of resin, plastic, glass, or the like.
In the embodiment of the present application, after the lens array completes the collection of the feedback light, the transmitted light transmitted from the lens array is transmitted to the image sensor 202 through the light guiding component.
In the embodiment of the present application, the implementation manner of the light guide assembly includes, but is not limited to, the following three types, which are respectively described below. Wherein the via array opened on the light blocking layer is hereinafter referred to as a first via array.
Implementation mode one of light guide component
The light guide assembly includes: the light-proof layer is provided with a through hole array, hereinafter the through hole array arranged on the light-proof layer is called a second through hole array, and the second through hole array comprises a first through hole and a second through hole which penetrate through the light-proof layer; and a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
Referring to fig. 6, the light guide assembly is an opaque layer with a second via array. In the embodiment of the application, the material of the light-tight layer can be black plastic film, silicon chip, metal sheet and the like.
In the embodiment of the application, the second through hole array can be formed on the light-tight layer in a laser, machining embossing, micro-nano machining or other modes. The second via array includes a first via and a second via, and of course, a third via and a fourth via may also be used, which is not limited in the embodiment of the present application. The arrangement positions of the through holes in the second through hole array are in one-to-one correspondence with the arrangement positions of the lenses in the lens array. The term "corresponding to" as used herein means that transmitted light transmitted through a certain lens exits from a through hole corresponding to the lens. For example, taking a first through hole and a second through hole in the second through hole array, and a first lens and a second lens in the lens array as examples, the first through hole corresponds to the first lens, that is, the transmitted light transmitted from the first lens is controlled to exit from the first through hole, and the second through hole corresponds to the second lens, that is, the transmitted light transmitted from the second lens is controlled to exit from the second through hole.
Taking the first through hole and the second through hole included in the through hole array as examples, a partition is arranged between the first through hole and the second through hole, and the light-proof layer can block light, so that the partition can block light, and crosstalk between the transmitted light transmitted by the first lens and the transmitted light transmitted by the lens is avoided.
In a specific implementation, when the depth of the through holes does not reach the preset depth, that is, a certain distance is kept between each through hole in the second through hole array and the image sensor 202, crosstalk may still occur between the light rays exiting from the through holes. Therefore, in order to better eliminate crosstalk between transmitted light rays transmitted from different lenses, in the embodiment of the present application, the thickness of the opaque layer is smaller than or equal to the vertical distance from the optical center of the lens to the image sensor 202, or the aspect ratio of the through holes in the second through hole array is greater than a preset value, for example, 3:1, 5:1 or 10:1, where the aspect ratio of the through holes is the ratio of the depth of the through holes to the aperture, that is, the ratio of the thickness of the opaque layer to the aperture. When the aperture of the through hole is fixed, the depth of the through hole is deeper, the distance between the bottom end of the through hole and the image sensor 202 is smaller, and the light emitted from the through hole directly irradiates the area where the projection of the through hole and the image sensor 202 is located, for example, the transmitted light transmitted from the first lens is emitted to the first area where the projection of the first through hole and the image sensor 202 is located through the first through hole, the transmitted light transmitted from the second lens is emitted to the second area where the projection of the second through hole and the image sensor 202 is located through the second through hole, so that the crosstalk between the transmitted light transmitted from the first lens and the transmitted light transmitted from the second lens and the first area is further eliminated.
Meanwhile, in order to effectively distinguish the transmitted light rays projected from different lenses, the aperture of each through hole in the second through hole array is smaller than or equal to the diameter of the lens corresponding to each through hole in the lens array, for example, the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens, so that the transmitted light rays transmitted from the second lens are prevented from directly entering the first through hole from the top end of the first through hole, and crosstalk occurs between the transmitted light rays transmitted in the first through hole.
In the embodiment of the present application, in order to meet the resolution requirement, each through hole in the second through hole array is required to correspond to one pixel, so that the aperture of each through hole in the second through hole array is smaller, and on the other hand, in order to eliminate crosstalk between light transmitted by different lenses, the depth of each through hole included in the second through hole array is deeper, that is, the aspect ratio of the through hole is larger. As described in (1), the second via array is manufactured by laser, mechanical stamping, or micromachining, but the difficulty of these machining methods often increases with the increase of the aspect ratio of the via, which is not beneficial for mass production. In view of this, the second implementation of the light guide assembly is provided in the embodiment of the present application, please refer to fig. 7, in which an optical fiber panel is used to eliminate the crosstalk between the transmitted light rays of different lenses.
Implementation mode II of light guide component
The light guide component is an optical fiber panel, and the numerical aperture of the optical fiber panel is smaller than a preset value, so that the optical fiber panel receives the transmitted light rays emitted from the lens array within a preset angle range, and crosstalk between the transmitted light rays emitted from the first lens of the lens array and the transmitted light rays emitted from the second lens of the lens array is eliminated. The preset value is obtained according to the diameter of any one lens included in the lens array and the distance between any one lens in the lens array and the optical fiber panel.
The fiber optic faceplate includes a core and a cladding. The filament diameter of the fiber core is obtained by the magnification of lenses in the lens array and the resolution required by line identification. For example, at a resolution of 500 pixels and a magnification of 2:1, the single pixel of the image sensor 202 cannot exceed 25um at maximum, but the single pixel of the image sensor 202 needs at least 4-6 fiber cores to be adapted, and if 4 fiber cores are taken as an example, the filament diameter of the fiber cores is about 6 um.
In an embodiment of the present application, in order to eliminate crosstalk between transmitted light rays of different lenses, the numerical aperture of the optical fiber panel is smaller than a preset value, so that the optical fiber panel receives the transmitted light rays transmitted from the lens array within a preset angle range. For example, the number of the cells to be processed,Wherein NA is the numerical aperture of the fiber optic panel,/>The diameter of the lenses in the lens array, L, is the distance between the lens array and the fiber optic faceplate.
On the other hand, the numerical aperture of the optical fiber panel is related to the refractive index of the core and the refractive index of the cladding, and when the numerical aperture of the optical fiber panel is small, the difference between the refractive index of the core and the refractive index of the cladding is also small, for example, when the numerical aperture of the optical fiber panel is 0.14, the difference between the refractive index of the core and the refractive index of the cladding is 0.01; when the numerical aperture of the fiber optic panel is 0.15, the difference between the refractive index of the core and the refractive index of the cladding is 0.02 or the like.
In the following, taking as an example that the difference between the refractive index of the core and the refractive index of the cladding is 0.01, the refractive index of the corresponding core n 1 = 1.5122, and the refractive index of the cladding n 2 = 1.50137, how to determine the preset angle range is described.
Referring to fig. 8, when the transmitted light of the lens is incident from the first end face of the optical fiber panel at the incident angle θ 0, the refracted light is formed to be incident on the first interface of the fiber core after refraction. If the angle of incidence phi 0 of the refracted ray at the first interface is greater than the critical angle phi c, the refracted ray will be totally reflected at the first interface, the totally reflected ray will be incident on a second interface of the core opposite the first interface, and the total reflection will occur at the second interface. In this way, the reflected light rays are emitted from the second end face of the optical fiber panel opposite to the first end face after multiple total reflections in the fiber core. From this, it can be deduced that the conditions for total reflection of transmitted light within the fiber optic panel are:
Wherein n 0 in the formula (1) is the absolute refractive index of air, n 1 is the refractive index of the fiber core, and n 2 is the refractive index of the cladding. Since n 0 ≡1, equation (1) can be reduced to the following equation:
When n 1＝1.5122,n2 = 1.50137, the incident angle θ 0 of the transmitted light is calculated to be 9.9 °. That is, the light transmitted at the incident angle smaller than θ 0 is totally reflected at the first interface by the refraction light formed after being incident from the first end face of the optical fiber panel, and the refraction light is transmitted without loss and exits from the second end face of the optical fiber panel; and the incident angle is larger than the angle theta 0, the refracted light formed after the transmitted light is incident from the first end face of the optical fiber panel is refracted again at the first interface, and the refracted light after the re-refraction is incident to the cladding.
In the embodiment of the application, the refracted ray after re-refraction can be eliminated by adding the absorption wire into the cladding, and a light blocking layer, for example made of polyacrylate, can be added on the outer side of the cladding to eliminate the ray emitted from the cladding. For both implementations, those skilled in the art may choose according to actual needs, and the implementation of the present application is not limited.
In the embodiment of the present application, in order to meet the resolution requirement, each through hole in the second through hole array is required to correspond to one pixel, so that the aperture of each through hole in the second through hole array is smaller, and on the other hand, in order to eliminate crosstalk between light transmitted by different lenses, the depth of each through hole included in the second through hole array is deeper, that is, the aspect ratio of the through hole is larger. As described in the first implementation manner of the light guide assembly, the second via array is fabricated by laser, mechanical processing, embossing, or micromachining, however, the difficulty of these processing manners often increases with the increase of the aspect ratio of the via, which is not beneficial to mass production. In view of this, the embodiment of the present application proposes a third implementation manner of the light guide assembly, that is, the N opaque layers stacked in the vertical direction are used to eliminate crosstalk between the transmitted light rays of different lenses.
Implementation mode III of light guide component
The light guide assembly includes: the light-proof layers are stacked in the vertical direction, each light-proof layer in the N light-proof layers is provided with a through hole array, the positions of the through hole arrays arranged on each light-proof layer are completely overlapped, the through hole arrays arranged on each light-proof layer are hereinafter called a third through hole array, the third through hole array comprises a third through hole and a fourth through hole which penetrate through each light-proof layer, and N is an integer;
and a partition is arranged between the third through hole and the fourth through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens.
In the embodiment of the application, each of the N opaque layers is provided with a third through hole array, and the arrangement positions of the through holes in the third through hole array are in one-to-one correspondence with the arrangement positions of the lenses in the lens array. The term "corresponding to" as used herein means that transmitted light transmitted through a certain lens exits from a through hole corresponding to the lens. For example, taking a third through hole and a fourth through hole in the third through hole array, the first lens and the second lens in the lens array are taken as examples, the third through hole corresponds to the first lens, that is, the transmitted light transmitted from the first lens is controlled to exit from the third through hole, and the fourth through hole corresponds to the second lens, that is, the transmitted light projected from the second lens is controlled to exit from the fourth through hole. In an embodiment of the application, N is obtained from the diameter of the lenses in the lens array and the period of the lens array, for example,Wherein/> P is the period of the lens array, which is the diameter of the lenses in the lens array.
In a specific implementation, when the depth of the through holes does not reach the preset depth, that is, a certain distance is kept between each through hole in the third through hole array and the image sensor 202, crosstalk may still occur between light rays exiting from the through holes. Therefore, in order to better eliminate crosstalk between transmitted light rays transmitted from different lenses, in an embodiment of the present application, the total thickness of the light control layers of the N-layer stack arrangement is less than or equal to the vertical distance from the optical center of the lens to the image sensor 202.
Meanwhile, in order to effectively distinguish the transmitted light rays transmitted from different lenses, the aperture of each through hole in the third through hole array is smaller than or equal to the diameter of the lens corresponding to each through hole in the lens array, for example, the aperture of the third through hole is smaller than or equal to the diameter of the first lens, and the aperture of the fourth through hole is smaller than or equal to the diameter of the second lens, so that the transmitted light rays transmitted from the second lens are prevented from directly entering the third through hole from the top end of the third through hole, and crosstalk occurs between the transmitted light rays transmitted in the third through hole. In the embodiment of the present application, the implementation manners of the N opaque layers include, but are not limited to, the following two implementation manners are respectively described below.
Implementation of light control layer
Referring to fig. 9,N, each opaque layer in the opaque layers includes a first sub-layer and a second sub-layer evaporated on an upper surface of the first sub-layer, wherein a material of the first sub-layer is a light-transmitting material, such as glass or plastic with light transmission, and a material of the second sub-layer is an opaque material, such as an opaque film, which may be a metal film, a black polyester film (Polyseter Film, PET), or a black glue layer.
In an embodiment of the present application, the formation of the via array on each opaque layer includes, but is not limited to, the following two ways:
as an example, a second sub-layer is vapor deposited on each first sub-layer using a vapor deposition process, and a third array of vias is opened on the second sub-layer.
Or as another example, a mask plate can be arranged on the first sub-layer of each layer, wherein at least two sub-areas are arranged on the mask plate, gaps are reserved between adjacent sub-areas in the at least two sub-areas, and a second sub-layer is evaporated on the at least two sub-areas. And removing the mask plate to obtain an opaque layer provided with the third via array, and stacking the opaque layers provided with the third via array together in the vertical direction in a bonding manner.
Whether the second sub-layer with a smaller thickness is perforated by means of laser, machining stamping, micromachining or the like to form a third through hole array, or the third through hole array is formed through a mask plate, compared with the process of perforating on the opaque layer with a thicker thickness, the processing difficulty is greatly reduced, and the method is more suitable for mass production.
Implementation mode II of light control layer
Referring to fig. 10, an n-layer opaque layer, such as a silicon substrate, is shown. And a third through hole array is arranged on each opaque layer, and the mode of arranging the third through hole array can be laser, machining embossing, micromachining and the like.
In the embodiment of the application, the light control layers provided with the third via arrays are stacked in the vertical direction in a bonding manner. Because the light guide component comprises N light-tight layers, the thickness of each light-tight layer is thinner than that of the light-tight layer in the first implementation mode of the light guide component, and the punching difficulty during punching is reduced by means of laser, machining embossing, micromachining and the like.
In an embodiment of the present application, the imaging light formed by the transmitted light transmitted through the light guide assembly is incident on the image sensor 202 to form data representing the image of the texture. Hereinafter, the operation of the image sensor 202 will be described taking as an example a fingerprint as a texture and a fingerprint image as a formed texture image.
The image sensor 202 includes an image sensing layer and an image chip, which may be connected through a flexible circuit board. When the fingerprint is processed, the image sensing layer converts the formed fingerprint image into an electric signal, the electric signal is sent to the image chip through the flexible circuit board, the image chip amplifies and converts the received electric signal and outputs a digital fingerprint image to the processor end, and the image chip and the processor end communicate through a serial peripheral interface (SERIAL PERIPHERAL INTERFACE, SPI) or an I2C (Inter-INTEGRATED CIRCUIT) interface.
In the embodiment of the present application, the image sensing layer may be a Charge-coupled Device (CCD) or a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) image sensor 202.
In a specific implementation process, in order to realize mass production of the detection device, the fingerprint image sensing layer may use a large-area image sensor 202, for example, a large-area image sensor 202 using an organic material as a photosensitive medium, and specifically, an organic printed photodetector (Organic Printed Photodetecor, OPD) may be deposited on a back plate of a plastic organic thin film transistor (Thin film transistor, TFT) to realize large-area image sensing; or a large area image sensor 202 using an amorphous silicon glass substrate, such as a photodiode and a thin film transistor, as the photo-sensitive element, with glass or plastic as the substrate.
In the embodiment of the application, the propagation directions of different feedback light rays are controlled by the control component 201, namely, crosstalk generated between the feedback light rays is eliminated, so that data for representing clear lines can be ensured to be formed after the image sensor 202 receives imaging light rays, more accurate line detection is realized, and the accuracy of optical identification under a display screen is improved.
In a second aspect, referring to fig. 11, an embodiment of the present application provides a detection apparatus, including:
The control component 1100 is configured to control a propagation direction of a feedback light emitted from a display screen having light transmittance, so as to form an imaging light, where the feedback light is a light reflected by a line on a surface of an object near or contacting the display screen under irradiation of an initial light emitted by the display screen when the object approaches or contacts the display screen;
An image sensor 1101 for forming data representing an image of a texture of a face of the object near or contacting the display module by receiving the imaging light.
In the embodiment of the application, the control component 1100 controls the propagation direction of the feedback light, so that crosstalk generated between different feedback lights can be eliminated, and the image sensor 1101 can form data for representing an image with clearer lines after receiving imaging light, thereby realizing more accurate line detection and improving the accuracy of optical identification under a display screen.
In the embodiment of the application, the initial light of the detection device is emitted by the light-emitting layer of the display screen with light transmittance. In the embodiment of the present application, the display screen may be an Organic Light-emitting diode (OLED), a Light-emitting diode (LED) Emitted Diode, a Flexible OLED (FOLED), or the like. The display screen is described by taking an OLED as an example.
Referring to fig. 4, when a voltage is applied across the display screen, a generated current flows from the cathode to the anode of the display screen, and the anode holes and cathode electrons are combined in the light emitting layer to generate light, i.e., the initial light as described in the embodiment of the present application. The material of the light emitting layer includes at least one host material and at least one guest doped material, the host material may be P-type material, that is, hole type material, or N-type material, that is, electron type material, and the guest doped material may be phosphorescent material or fluorescent material.
In the embodiment of the present application, the descriptions of the control unit 1100 and the image sensor 1101 are the same as those of the control unit 201 and the image sensor 202 in the first aspect, and are not repeated here.
In a third aspect, referring to fig. 12, an embodiment of the present application provides a terminal device, including:
a display screen 1200 having light transmittance;
The detecting device 1201 of the first aspect is configured to obtain data representing an image of a texture on a surface of an object that is in proximity to or in contact with the display screen 1200 when the object is in proximity to or in contact with the display screen 1200;
A processor 1202, coupled to the detection means 1201, is used to convert the data of the image into an image and to identify whether the image is a set image.
In embodiments of the present application, the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, handheld, computer-built-in or vehicle-mounted mobile device, a smart wearable device, or the like, including but not limited to. For example, a mobile phone, a tablet (PAD), a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a point of sale (Piont of Sales, POS), a car computer, a smart watch, a smart helmet, smart glasses, or a smart bracelet, etc.
In the embodiment of the present application, after the processor 1202 receives the data for representing the fingerprint image, the processor 1202 converts the data of the fingerprint image into the fingerprint image, extracts the feature points of the fingerprint image, matches the extracted feature points with the feature points stored in advance, obtains the matching degree between the extracted feature points and the feature points stored in advance, when the matching degree is greater than a preset value, for example, 90%, the matching is successful, when the matching degree is less than the preset value, the matching is failed, and when the matching is failed, the processor 1202 outputs a prompt message, for example, outputs a voice prompt "please re-enter the fingerprint", or prompts that the fingerprint matching is failed by flashing of light.
The processor 1202 may be a general purpose central processing unit or an Application SPECIFIC INTEGRATED Circuit (ASIC), one or more integrated circuits for controlling program execution, a hardware Circuit developed using a Field Programmable Gate Array (FPGA) (Field Programmable GATE ARRAY, english), or a baseband processor.
In the embodiment of the present application, the terminal device further includes:
A sensor 1203 for detecting a touch operation for activating a detection function of the detection device 1201. The touch operation may be a pressing operation or a sliding operation.
After detecting the touch operation, the detection function of the detection device 1201 is activated, and in order to reduce the power consumption of the detection device 1201, in the embodiment of the present application, the processor 1202 is further configured to:
determining a touch position of the touch operation according to the touch operation;
The light sources at the positions corresponding to the touch positions included in the light emitting assembly of the detecting device 1201 are controlled to be in the on state, and the other light sources in the light emitting assembly are controlled to be in the off state.
In an embodiment of the present application, sensor 1203 may be a pressure sensor, or a gravity sensor.
In the embodiment of the present application, taking fingerprint recognition as an example, the light emitting component includes a first light source, a second light source, a third light source and a fourth light source, and when the touch position is the first area in the fingerprint recognition area on the display screen 1200, the first light source and the second light source in the light emitting component are controlled to be turned on, and the third light source and the fourth light source are controlled to be turned off; when the touch position is the second area in the fingerprint recognition area on the display screen 1200, the third light source and the fourth light source in the light emitting assembly are controlled to be turned on, and the first light source and the second light source are controlled to be turned off. Therefore, when the touch positions are different, part of the light sources in the light-emitting assembly are controlled to be in an on state and used for emitting initial light sources, and other part of the light sources in the light-emitting assembly are controlled to be in an off state, so that the power consumption of the terminal equipment is reduced.
In a fourth aspect, referring to fig. 13, an embodiment of the present application provides a terminal device, including:
a display screen 1300 having light transmittance;
The detecting device 1301 of the second aspect is configured to obtain, when an object approaches or contacts the display screen 1300, data representing an image of a texture of a surface of the object that approaches or contacts the display screen 1300;
A processor 1302, coupled to the detection device 1301, is configured to convert data of the image into the image and identify whether the image is a set image.
In embodiments of the present application, the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, handheld, computer-built-in or vehicle-mounted mobile device, a smart wearable device, or the like, including but not limited to. For example, a mobile phone, a tablet (PAD), a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a point of sale (Piont of Sales, POS), a car computer, a smart watch, a smart helmet, smart glasses, or a smart bracelet, etc.
In the embodiment of the present application, after the processor 1302 receives the data of the fingerprint image, the data of the fingerprint image is converted into the fingerprint image, the feature points of the fingerprint image are extracted, the extracted feature points are matched with the feature points stored in advance, so as to obtain the matching degree between the extracted feature points and the feature points stored in advance, when the matching degree is greater than a preset value, for example, 90%, the matching is successful, when the matching degree is less than the preset value, the matching is failed, and when the matching is failed, the processor 1302 outputs prompt information, for example, outputs a voice prompt of "please re-enter the fingerprint", or prompts that the matching of the fingerprint is failed through flashing of light.
The processor 1302 may be a general-purpose central processing unit or an Application SPECIFIC INTEGRATED Circuit (ASIC), one or more integrated circuits for controlling program execution, a hardware Circuit developed using a Field Programmable Gate Array (FPGA) (Field Programmable GATE ARRAY, english), or a baseband processor.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A detection apparatus, characterized by comprising:
The light-emitting component is used for emitting initial light;
the control component is used for controlling the propagation direction of feedback light emitted from the display screen with light transmittance so as to form imaging light, wherein the feedback light is reflected by lines on one surface of an object, which is close to or contacted with the display screen, under the irradiation of the initial light when the object is close to or contacted with the display screen;
The image sensor is used for forming data of images used for representing lines of one surface of the object, which is close to or contacted with the display module, by receiving the imaging light rays;
Wherein the control assembly comprises: a lens array for converging the feedback light to form a transmitted light incident on the image sensor; a light guide assembly disposed between the lens array and the image sensor for eliminating crosstalk occurring between transmitted light rays emitted from each lens in the lens array to form the imaging light rays;
The light guide assembly comprises a light guide layer, a light shielding layer and a light shielding layer, wherein the light shielding layer in the light guide assembly is provided with a through hole array, and the through hole array comprises a first through hole and a second through hole penetrating through the light shielding layer; a partition is arranged between the first through hole and the second through hole so as to eliminate crosstalk between the transmitted light rays emitted from the first lens and the transmitted light rays emitted from the second lens; the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens.
2. The detection apparatus according to claim 1, wherein the light-impermeable layer comprises:
the light-proof layer is stacked on the vertical direction, each light-proof layer in the N light-proof layers is provided with the through hole array, the positions of the through hole arrays formed in each light-proof layer are completely overlapped, the through hole arrays comprise first through holes and second through holes penetrating through each light-proof layer, and N is an integer.
3. The apparatus according to claim 2, wherein N is obtained by rounding up a function obtained value according to a duty cycle; wherein the duty cycle is a function of 1 and the inverse of the difference between the duty cycles, the duty cycle being the ratio of the diameter of the lenses in the lens array to the period of the lenses of the lens array.
4. The detecting device according to claim 1, wherein a thickness of the light-impermeable layer is smaller than or equal to a vertical distance from an optical center of a lens in the lens array to the image sensor, so that a transmitted light ray emitted from a first lens of the lens array is emitted to a first area where a projection of the first through hole on the image sensor is located through the first through hole, and a transmitted light ray emitted from a second lens of the lens array is emitted to a second area where a projection of the second through hole on the image sensor is located through the second through hole.
5. The detection device according to claim 1, wherein the light guide assembly is an optical fiber panel, and a numerical aperture of the optical fiber panel is smaller than a preset value, so that the optical fiber panel receives transmitted light rays in a preset angle range emitted from the lens array, so as to eliminate crosstalk between the transmitted light rays emitted from a first lens of the lens array and the transmitted light rays emitted from a second lens of the lens array;
wherein the preset value is the ratio of the diameter of the lenses in the lens array to the distance between the lens array and the fiber optic panel.
6. The device according to any one of claims 1 to 5, wherein,
The detection device further includes:
And the collimation assembly is used for controlling the initial light rays emitted by different light sources included in the light-emitting assembly to irradiate different areas on one surface of the object.
7. The detection apparatus of claim 6, wherein the collimation assembly comprises:
and a light transmitting portion disposed between adjacent light blocking portions for blocking the initial light from being irradiated onto the pixel electrodes of the display screen to control the initial light from the light transmitting portion to be irradiated onto different areas on one face of the object from a gap between the adjacent pixel electrodes.
8. A detection apparatus, characterized by comprising:
The control component is used for controlling the propagation direction of feedback light emitted from the display screen with light transmittance so as to form imaging light, wherein the feedback light is reflected by grains on one surface of an object, which is close to or contacted with the display screen, under the irradiation of initial light emitted by the display screen when the object is close to or contacted with the display screen;
The image sensor is used for forming data of images used for representing lines of one surface of the object, which is close to or contacted with the display module, by receiving the imaging light rays;
Wherein the control assembly comprises: a lens array for converging the feedback light to form a transmitted light incident on the image sensor; a light guide assembly disposed between the lens array and the image sensor for eliminating crosstalk occurring between transmitted light rays emitted from each lens in the lens array to form the imaging light rays;
The light guide assembly comprises a light guide layer, a light shielding layer and a light shielding layer, wherein the light shielding layer in the light guide assembly is provided with a through hole array, and the through hole array comprises a first through hole and a second through hole penetrating through the light shielding layer; the aperture of the first through hole is smaller than or equal to the diameter of the first lens, and the aperture of the second through hole is smaller than or equal to the diameter of the second lens.
9. A terminal device, comprising:
a display screen having light transmittance;
A detection apparatus according to any one of claims 1 to 7, for obtaining data representing an image of a texture of a face of an object in proximity to or in contact with the display screen when the object is in proximity to or in contact with the display screen;
And a processor coupled to the detection device for converting the data of the image into the image and identifying whether the image is a set image.
10. A terminal device, comprising:
a display screen having light transmittance;
the detecting device according to claim 8, which is configured to obtain data representing an image of a texture of a face of an object that is brought into proximity to or contact with the display screen when the object is brought into proximity to or contact with the display screen;
And a processor coupled to the detection device for converting the data of the image into the image and identifying whether the image is a set image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN108734073B (en) * | 2017-04-14 | 2024-05-24 | 华为技术有限公司 | Detection device and terminal equipment |
| CN109190465A (en) * | 2018-07-26 | 2019-01-11 | 维沃移动通信有限公司 | A kind of light compensating lamp mould group, fingerprint identification method and terminal device |
| CN109037296B (en) * | 2018-08-07 | 2021-02-05 | 武汉天马微电子有限公司 | Display device and electronic equipment |
| CN109271057B (en) * | 2018-08-16 | 2021-04-13 | Oppo广东移动通信有限公司 | Display module and electronic device |
| CN211045441U (en) * | 2018-08-21 | 2020-07-17 | 神盾股份有限公司 | Optical sensing system |
| WO2020087242A1 (en) * | 2018-10-30 | 2020-05-07 | 深圳市汇顶科技股份有限公司 | In-display optical fingerprint device and handheld device having optical fingerprint anti-counterfeiting sensing function |
| CN111182227A (en) * | 2018-11-13 | 2020-05-19 | 上海耕岩智能科技有限公司 | Topological structure light source driving method applied to under-screen image imaging, storage medium and electronic equipment |
| CN109740556B (en) * | 2019-01-10 | 2021-02-02 | 京东方科技集团股份有限公司 | Fingerprint identification module of optical structure based on collimated light extraction and preparation method thereof |
| CN109863506B (en) * | 2019-01-22 | 2022-03-29 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN110023956A (en) * | 2019-02-28 | 2019-07-16 | 深圳市汇顶科技股份有限公司 | Optical image acquisition unit, optical image acquisition system and electronic equipment |
| CN111695390A (en) * | 2019-03-15 | 2020-09-22 | 京东方科技集团股份有限公司 | Method for driving grain recognition device and grain recognition device |
| CN110309705B (en) | 2019-04-30 | 2022-04-19 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110730968A (en) * | 2019-05-06 | 2020-01-24 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN110133892B (en) * | 2019-05-31 | 2022-04-08 | 厦门天马微电子有限公司 | Display panel, display device, and method for manufacturing display panel |
| CN110275341B (en) * | 2019-06-28 | 2022-04-12 | 厦门天马微电子有限公司 | Display panel and display device |
| CN111414897A (en) * | 2019-08-02 | 2020-07-14 | 神盾股份有限公司 | Fingerprint sensing module |
| CN111328398B (en) * | 2019-08-23 | 2021-09-17 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| EP3809315B1 (en) | 2019-08-23 | 2022-12-07 | Shenzhen Goodix Technology Co., Ltd. | Fingerprint detection method |
| CN211375617U (en) * | 2019-08-23 | 2020-08-28 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| EP3889827B1 (en) * | 2019-10-18 | 2023-05-24 | Shenzhen Goodix Technology Co., Ltd. | Fingerprint detection apparatus and electronic device |
| CN110728266A (en) * | 2019-10-30 | 2020-01-24 | 维沃移动通信（杭州）有限公司 | Display module and electronic equipment |
| CN111062367A (en) * | 2019-12-31 | 2020-04-24 | 武汉华星光电半导体显示技术有限公司 | Fingerprint identification device |
| CN112697788A (en) * | 2020-12-14 | 2021-04-23 | 河南牧业经济学院 | Electrode array-based rice non-adhesion image acquisition method and system |
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| CN207586941U (en) | 2018-07-06 |
| CN108734073A (en) | 2018-11-02 |
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