CN110008840B - Optical fingerprint module and fingerprint identification display device - Google Patents
Optical fingerprint module and fingerprint identification display device Download PDFInfo
- Publication number
- CN110008840B CN110008840B CN201910175134.XA CN201910175134A CN110008840B CN 110008840 B CN110008840 B CN 110008840B CN 201910175134 A CN201910175134 A CN 201910175134A CN 110008840 B CN110008840 B CN 110008840B
- Authority
- CN
- China
- Prior art keywords
- optical fingerprint
- optical
- photosensitive
- circuit
- light
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Images
Classifications
-
- 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
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Human Computer Interaction (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
An optical fingerprint module comprises an optical fingerprint chip, wherein the optical fingerprint chip comprises a photosensitive layer and a micro-focusing lens, the photosensitive layer comprises a plurality of photosensitive elements which are distributed at intervals, the micro-focusing lens is arranged above the photosensitive layer, the micro-focusing lens comprises a plurality of light-focusing parts which are distributed at intervals, the light-focusing parts are convex spheres, and the light-focusing parts and the photosensitive elements are distributed in a one-to-one corresponding manner; the utility model provides a fingerprint identification display device, includes display panel and foretell optics fingerprint module, and the below of display panel is located to optics fingerprint module. According to the optical fingerprint module and the fingerprint identification display device, the micro-focusing lens is additionally arranged on the optical fingerprint chip, so that more light reflected by the pressing finger is irradiated onto the photosensitive element of the optical fingerprint chip, and the improvement of the fingerprint imaging quality in a darker fingerprint collection environment is facilitated.
Description
Technical Field
The invention relates to the technical field of fingerprint identification, in particular to an optical fingerprint module and a fingerprint identification display device.
Background
With the rapid development of the mobile internet, information interaction between mobile terminal users is also rapidly increasing, a biometric identification technology in a mobile smart phone interaction unlocking scheme becomes a new interaction technology, and a fingerprint identification unlocking technology becomes a convenient and rapid unlocking mode.
At present, with the birth of the full screen mobile phone, the fingerprint identification technology under the screen comes into play, take OLED full screen (organic light emitting diode screen) mobile phone to carry on optical fingerprint module under the screen as an example, the organic luminescent layer in the OLED full screen is as the spontaneous light source, when the user indicates to press the screen surface, the light that the spontaneous light source sent is reflected to the finger, the light is on the optical fingerprint module through the pixel clearance outgoing on the organic luminescent layer of OLED full screen again, when the light condition of fingerprint collection is relatively poor, the collection of fingerprint and image quality all receive the influence easily.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an optical fingerprint module and a fingerprint identification display device so as to solve the problem that the fingerprint imaging is not clear or difficult to image under the darker fingerprint acquisition environment.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
according to an aspect of the present invention, an optical fingerprint module is provided, which includes an optical fingerprint chip, where the optical fingerprint chip includes a photosensitive layer and a micro-focusing lens, the photosensitive layer includes a plurality of photosensitive elements distributed at intervals, the micro-focusing lens is disposed above the photosensitive layer, the micro-focusing lens includes a plurality of light-focusing portions distributed at intervals, the light-focusing portions are convex spheres, and the light-focusing portions and the photosensitive elements are distributed in a one-to-one correspondence manner.
According to the optical fingerprint module, the micro-focusing lens is additionally arranged on the optical fingerprint chip, so that light reflected by the pressing finger is irradiated to the photosensitive element of the optical fingerprint chip more, and the fingerprint imaging quality under the darker fingerprint collection environment is improved.
In one embodiment, the micro-focusing lens further includes a plurality of spacers, one spacer is disposed between every two adjacent light-gathering portions, a photosensitive cell gap is formed between the adjacent photosensitive elements, and the plurality of spacers and the plurality of photosensitive cell gaps are distributed in a one-to-one correspondence manner.
In one embodiment, the upper surface of the spacer is a plane, and the upper surface of the spacer is lower than the upper surface of the light-gathering part, so that a recess is formed at the spacer.
In one embodiment, the upper surface of the spacer is a plane, and the upper surface of the spacer is higher than the upper surface of the light-gathering part.
In one embodiment, a black film layer is disposed on a surface of the spacer.
In one embodiment, the area of the black film layer on the spacer of the micro-focusing lens projected onto the optical fingerprint chip is smaller than the area of the corresponding photosensitive unit gap, and the area of the light-condensing portion projected onto the optical fingerprint chip is larger than the area of the corresponding photosensitive element.
In one embodiment, the optical fingerprint module further includes an optical lens component and a first filter layer, the optical lens component is disposed above the optical fingerprint chip, and the first filter layer is disposed between the optical lens component and the optical fingerprint chip.
In one embodiment, the optical fingerprint chip further includes a circuit layer, a substrate, a second filter layer, and an upper cover plate, wherein the circuit layer is formed on the substrate, the photosensitive layer is disposed on the circuit layer, the second filter layer is disposed between the photosensitive layer and the micro focusing lens, and the upper cover plate is disposed on the micro focusing lens.
According to another aspect of the present invention, a fingerprint identification display device is provided, which includes a display panel and the optical fingerprint module as described above, wherein the optical fingerprint module is disposed below the display panel.
In one embodiment, the optical fingerprint module further includes a fingerprint identification circuit, the fingerprint identification circuit includes a plurality of detection control circuits, a plurality of acquisition unit circuits and a power supply, the detection control circuit includes an identification switch element, an exposure control element and a photoelectric conversion circuit, the identification switch element, the exposure control element and the photoelectric conversion circuit are sequentially connected, the identification switch element is further connected to a light intensity detection circuit, the identification switch element is used for switching on or switching off the connection between the power supply and the input end of the exposure control element according to the light intensity detected by the light intensity detection circuit, the exposure control element is used for controlling the time for the exposure control element to communicate the identification switch element and the photoelectric conversion circuit according to the light intensity, the photoelectric conversion circuit includes a first photosensitive element, the photoelectric conversion circuit is used for converting the received optical signal into a corresponding electric signal and outputting the electric signal to a signal output line when the identification switch element is communicated with the first photosensitive element; the acquisition unit circuit comprises a second photosensitive element, the second photosensitive element is used for converting a received optical signal into a corresponding electric signal when the identification switch unit in the detection control circuit is communicated with the first photosensitive element, and the acquisition unit circuit determines whether to convert the received optical signal into the corresponding electric signal or not and determines the time for continuously converting the received optical signal into the corresponding electric signal and outputting the corresponding electric signal to a signal output line according to the detection control circuit; the display panel comprises a fingerprint identification area, the fingerprint identification area comprises a first area and a second area, the first photosensitive element of the detection control circuit corresponds to the first area, and the second photosensitive element of the acquisition unit circuit corresponds to the second area.
According to the fingerprint identification display device, the micro-focusing lens is arranged on the optical fingerprint chip in a matched mode, and the imaging quality and the sensitivity of the optical fingerprint module can be improved.
Other advantages of the present invention will be described in detail in the following detailed description of the invention, which refers to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic diagram of a fingerprint identification display device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an optical fingerprint chip according to an embodiment of the optical fingerprint module of the present invention;
FIG. 3 is a schematic diagram of an optical fingerprint chip according to another embodiment of the optical fingerprint module of the present invention;
FIG. 4 is a block diagram of an embodiment of a detection control circuit according to the present invention;
FIG. 5 is a circuit diagram of an embodiment of a detection control circuit according to the present invention;
FIG. 6 is a diagram of a circuit of an acquisition unit according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of an acquisition unit circuit in an embodiment of a fingerprint identification circuit of the present invention;
FIG. 8 is a schematic diagram of a display panel area of the fingerprint identification display device shown in FIG. 1.
Description of reference numerals: 11. a power supply 13, an identification switch element 15, an exposure control element 17, a photoelectric conversion circuit 171, a first photosensitive element 173, a first row selection element 19, a first signal processing circuit 191, a first reset element 193, a first filter element 195, a first signal following element 30, an optical fingerprint module 31, an optical fingerprint chip 391, a circuit layer 393, a substrate 395, a second filter layer 397, an upper cover plate 35, a photosensitive layer 37, a photosensitive element 371, a photosensitive cell gap 41, a micro-focusing lens 43, a light-gathering portion 415, a transition groove 45, a spacer 51, an optical lens assembly 53, a first filter layer 61, a display panel 611, a touch surface 613, a first area 615, a second area 621, incident light 623, reflected light 625, emergent light 63, an organic light-emitting layer 631, a pixel cell 633, a photoelectric conversion element 31, a first light-sensitive element 173, a first row selection element 19, a first signal processing circuit 191, a first reset element 193, a first filter element 195, a first signal following element 30, a micro-focusing lens assembly 415, a light-gathering unit 45, a second light-emitting layer 53, a second light-emitting layer 613, a second light-emitting layer, A pixel gap 65, a protective layer 651, an opening region 71, a second photosensitive element 73, a second signal processing circuit 731, a second reset element 733, a second filter element 735, a second signal following element 75, a second row and column selection element
Detailed Description
To further explain the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings, in which like reference numerals refer to like parts.
The invention provides a fingerprint identification display device, as shown in fig. 1, comprising a display panel 61 and an optical fingerprint module 30, wherein the display panel 61 comprises a touch surface 611, and the optical fingerprint module 30 is arranged on one side of the display panel 61 opposite to the touch surface 611. In this embodiment, the display panel 61 is an OLED full-face screen (organic light emitting diode screen), and includes an organic light emitting layer 63, where the organic light emitting layer 63 includes a plurality of pixel units 631, each pixel unit 631 is used as a self-luminous source when performing fingerprint identification, a pixel gap 633 is disposed between adjacent pixel units 631, a protective layer 65 is disposed below the display panel 61, an opening region 651 is disposed on the protective layer 65, and the optical fingerprint module 30 is disposed corresponding to the opening region 651. In the fingerprint unlocking process, when a finger presses the surface of the screen, the organic light emitting layer 63 in the OLED full-face screen serves as a self-light emitting source to emit incident light 621 upwards, the incident light 621 hits the skin layer of the finger to generate reflected light 623, the reflected light 623 penetrates through the glass on the surface of the screen and the pixel gap 633 in the OLED full-face screen to generate emitted light 625, and the emitted light 625 reaches the optical fingerprint module 30 through the opening region 651.
In this embodiment, the optical fingerprint module 30 includes an optical fingerprint chip 31, an optical lens assembly 51 and a first filter layer 53, the optical lens assembly 51 is disposed above the optical fingerprint chip 31, the first filter layer 53 is disposed between the optical lens assembly 51 and the optical fingerprint chip 31, the outgoing light 625 emitted from the pixel gap 633 penetrates through the opening region 651, and is imaged on the optical fingerprint chip 31 after passing through the optical lens assembly 51 and the first filter layer 53 in sequence, and a fingerprint identification circuit on the optical fingerprint chip 31 performs photoelectric conversion on this, so as to collect fingerprint information of a pressed finger.
In this embodiment, the area of the optical fingerprint module 30 directly below the display panel 61 is a fingerprint identification area, and the fingerprint identification area is divided into a first area 613 and a second area 615. The first area 613 may be opposite to an edge area and a central area of the photosensitive layer 35 of the optical fingerprint module 30, and the second area 615 may be opposite to an area between the edge area and the central area of the photosensitive layer 35 of the optical fingerprint module 30.
Fig. 2 is a schematic structural diagram of the optical fingerprint chip 31 in the optical fingerprint module 30 shown in fig. 1, and as shown in fig. 2, the optical fingerprint chip 31 includes a photosensitive layer 35, a micro-focusing lens 41, a circuit layer 391, a base material 393, a second filter layer 395, and an upper cover plate 397.
The photosensitive layer 35 includes a plurality of photosensitive elements 37 distributed at intervals, the micro-focusing lens 41 is disposed above the photosensitive layer 35, the circuit layer 391 is formed on the substrate 393, the photosensitive layer 35 is disposed on the circuit layer 391, the second filter layer 395 is disposed between the photosensitive layer 35 and the micro-focusing lens 41, and the upper cover plate 397 is disposed on the micro-focusing lens 41.
Specifically, as shown in fig. 2, the micro focusing lens 41 includes a plurality of light-condensing portions 43 and a plurality of spacing portions 45 which are distributed at intervals, the light-condensing portions 43 are convex spherical, the plurality of light-condensing portions 43 of the micro focusing lens 41 are distributed in a one-to-one correspondence with the plurality of photosensitive elements 37 of the photosensitive layer 35, one spacing portion 45 is arranged between every two adjacent light-condensing portions 43, a photosensitive unit gap 371 is formed between the adjacent photosensitive elements 37, and the plurality of spacing portions 45 are distributed in a one-to-one correspondence with the plurality of photosensitive unit gaps 371.
In the present embodiment, the upper surface of the spacer 45 is a plane, and the upper surface of the spacer 45 is lower than the upper surface of the light-condensing portion 43, so that a recess is formed at the spacer 45.
In this embodiment, the surface of the spacing portion 45 is provided with a black film layer, and the black film layer can be disposed in a film coating manner. The area of the black film layer projected onto the photosensitive layer 35 is smaller than the area of the corresponding photosensitive unit gap 371, and meanwhile, the area of the light-gathering part 43 projected onto the photosensitive layer 35 is larger than the area of the corresponding photosensitive element 37, so that the emergent light 625 reflected by the finger and emitted through the pixel gap 633 can be completely collected by the photosensitive element 37 on the optical fingerprint chip 31.
Fig. 3 is a schematic structural diagram of an optical fingerprint chip 31 of another embodiment, which is different from the optical fingerprint chip 31 shown in fig. 2 in that in the present embodiment, the upper surface of the spacer 45 is a plane, and the upper surface of the spacer 45 is higher than the upper surface of the light-gathering part 43. As shown in fig. 2, the convex spherical light-gathering part 43 with a curved upper surface and the spacer 45 with a flat upper surface and higher than the upper surface of the light-gathering part 43 are distributed above the photosensitive layer 35 at intervals, and the adjacent light-gathering parts 43 and spacer 45 are transitionally connected by the transition groove 415, and in other embodiments, the position and structure of the transition structure between the light-gathering part 43 and the spacer 45 can be adjusted according to different geometric effects that need to be achieved.
The optical fingerprint module provided by the invention has the advantages that the micro-focusing lens is additionally arranged on the optical fingerprint chip, so that the light reflected by the pressing finger is irradiated to the first photosensitive element of the optical fingerprint chip more, and the improvement of the fingerprint imaging quality under the darker fingerprint collection environment is facilitated.
In the optical fingerprint module 30 provided by the invention, the optical fingerprint chip 31 comprises a fingerprint identification circuit, and the fingerprint identification circuit comprises a plurality of detection control circuits, a plurality of acquisition unit circuits and a power supply 11. In this embodiment, the photosensitive element 37 includes a first photosensitive element 171 and a second photosensitive element 71, each detection control circuit includes a first photosensitive element 171, each collecting unit circuit includes a second photosensitive element 71, a plurality of first photosensitive elements 171 and a plurality of second photosensitive elements 71 are distributed in an array on the optical fingerprint chip 31, and any one of the first photosensitive elements 171 or any one of the second photosensitive elements 71 constitutes a fingerprint collecting pixel point on the optical fingerprint chip 31.
Referring to fig. 4 and 5 in combination, in this embodiment, the detection control circuit includes a power source 11, an identification switch element 13, an exposure control element 15 and a photoelectric conversion circuit 17, the identification switch element 13 and the exposure control element 15 are sequentially connected to the photoelectric conversion circuit 17, the identification switch element 13 is further connected to the light intensity detection circuit, the identification switch element 13 is configured to turn on or off the connection between the power source 11 and the exposure control element 15 according to the light intensity detected by the light intensity detection circuit, the exposure control element 15 is configured to control the time for which the exposure control element 15 communicates the identification switch element 13 with the photoelectric conversion circuit 17 according to light, the photoelectric conversion circuit 17 includes a first photosensitive element 171, the photoelectric conversion circuit 17 is configured to convert the received optical signal into a corresponding electrical signal and output the electrical signal to the signal output line when the identification switch element 13 is in communication with the first photosensitive element 171.
Specifically, the photoelectric conversion circuit 17 includes a first photosensitive element 171, a first row and column selection element 173, and a first signal processing circuit 19, the identification switch element 13, the exposure control element 15, the first signal processing circuit 19, and the first row and column selection element 173 are connected in sequence, and the first photosensitive element 171 is disposed between the exposure control element 15 and the first signal processing circuit 19; the first electrode of the first photosensitive element 171 is connected to the first signal processing circuit 19, the second electrode of the first photosensitive element 171 is connected to the reference voltage terminal, the first photosensitive element 171 is configured to convert the received optical signal into a corresponding electrical signal, the first signal processing circuit 19 is configured to process the electrical signal received from the first photosensitive element 171, the first row selection element 173 is further connected to the row and column control circuit, and the first row selection element 173 is configured to control whether to output the electrical signal output from the first signal processing circuit 19 to the signal output line according to a signal of the row and column control circuit.
The exposure control element 15 is also connected to the exposure control circuit, and the control end, the input end and the output end of the identification switch element 13 are respectively connected with the light intensity detection circuit, the power supply 11 and the input end of the exposure control element 15, and are used for switching on or off the connection between the power supply 11 and the input end of the exposure control element 15 according to the light intensity detected by the light intensity detection circuit; the control end of the exposure control element 15 is connected with the exposure control circuit, and the output end of the exposure control element 15 is connected with the first electrode of the first photosensitive element 171; the input terminal of the first row and column selection element 173 is connected to the first signal processing circuit 19, the control terminal of the first row and column selection element 173 is connected to the row and column control circuit, the output terminal of the first row and column selection element 173 is connected to the signal output line, and the first row and column selection element 173 is used for turning on or off the connection between the input terminal and the output terminal of the first row and column selection element 173 according to the signal of the row and column control circuit, and outputting the electrical signal output from the first signal processing circuit 19 to the signal output line when the first row and column selection element 173 is turned on.
In the present embodiment, the first signal processing circuit 19 includes a first reset element 191, a first filter element 193, and a first signal follower element 195; the control end, the input end and the output end of the first filter element 193 are respectively connected to the control ends of the denoising control circuit, the first photosensitive element 171 and the first signal follower 195, and the first filter element 193 is used for filtering out the dark current signal output by the first photosensitive element 171 under the control of the denoising control circuit; an input terminal, a control terminal, and an output terminal of the first reset element 191 are connected to the power supply 11, the reset control circuit, and the output terminal of the first filter element 193, respectively, and the first reset element 191 is configured to reset a circuit voltage of the detection control circuit under the control of the reset control circuit; the control terminal, the input terminal and the output terminal of the first signal follower 195 are respectively connected to the output terminal of the first reset element 191, the power source 11 and the input terminal of the first row selection element 173, and the first signal follower 195 is configured to follower-amplify the electrical signal output by the first filter element 193 and output the resultant follower-amplified signal to the first row selection element 173.
In this embodiment, the light intensity detection circuit outputs a current signal according to the intensity of light when detecting light, controls the identification switch element 13 to be turned on or off according to the intensity of the current signal, and controls the identification switch element 13 to be turned on when the current signal reaches a preset current. The exposure control circuit determines the time for the exposure control element 15 to communicate the identification switch element 13 with the first photosensitive element 171 according to the time required for the charge amount of the current output from the signal output line to reach the preset charge amount when the exposure control element 15 was previously turned on.
In the detection control circuit, the identification switch element 13 is used for judging whether the finger of the user presses the screen according to the intensity of the light reflected to the first photosensitive element 171 and determining a time node for the fingerprint identification circuit to start fingerprint identification according to the judgment, and the exposure control element 15 is used for determining the time length for the fingerprint identification circuit to perform fingerprint collection according to the intensity of the light reflected by the finger after the fingerprint identification is started by the identification switch element 13.
As shown in fig. 6 and 7, the collecting unit circuit includes a second photosensitive element 71, a second signal processing circuit 73 and a second row-column selecting element 75, the control circuit in the fingerprint identification circuit adjusts and controls the plurality of collecting unit circuits according to the light intensity judgment results and the collecting time length decisions of the plurality of detection control circuits to control whether the collecting unit circuits start to convert the received light signals into corresponding electrical signals and continuously convert the received light signals into corresponding electrical signals and determine the time length of the signals output to the signal output lines, the second photosensitive element 71, the second signal processing circuit 73 and the second row-column selecting element 75 are connected in sequence, the second photosensitive element 71 is used for converting the light signals received by itself into corresponding electrical signals when the identification switch element 13 in the detection control circuit is communicated with the first photosensitive element 171, the second signal processing circuit 73 is used for receiving and processing the electrical signals output from the second photosensitive element 71, the second row/column selection element 75 is also connected to the row/column control circuit, and the second row/column selection element 75 is used for controlling whether to output the electrical signal output from the second signal processing circuit 73 to the signal output line according to the signal of the row/column control circuit. In the present embodiment, the second signal processing circuit 73 includes a second reset element 731, a second filter element 733, and a second signal following element 735; the control end, the input end and the output end of the second filtering element 733 are respectively connected to the denoising control circuit, the second photosensitive element 71 and the control end of the second signal following element 735, and the signal denoising unit 733 is configured to filter the dark current signal output by the second photosensitive element 71 under the control of the denoising control circuit; the input end, the control end and the output end of the second reset element 731 are respectively connected with the power supply 11, the reset control circuit and the output end of the second filter element 733, and the second reset element 731 is used for resetting the circuit voltage of the acquisition unit circuit under the control of the reset control circuit; a control terminal, an input terminal and an output terminal of the second signal following element 735 are respectively connected to the output terminal of the second resetting element 731, the power source 11 and an input terminal of the second rank selection element 75, the second signal following element 735 is configured to follow and amplify the electrical signal output by the second filtering element 733 and output the obtained follow and amplified signal to the second rank selection element 75; the control terminal, the input terminal and the output terminal of the second row/column selection element 75 are respectively connected to the row/column control circuit, the second signal follower element 735 and the signal output line, and are configured to turn on or off the connection between the input terminal and the output terminal of the second row/column selection element 75 according to a signal of the row/column control circuit, and output an electrical signal to the signal output line when the second row/column selection element 75 is turned on.
As shown in fig. 5 and 7, in the present embodiment, the identification switch element 13, the exposure control element 15, the first row selection element 173, the first reset element 191, the first filter element 193, the first signal follower element 195, the second reset element 731, the second filter element 733, the second signal follower element 735, and the second row selection element 75 are MOS transistors, and the first photosensitive element 171 and the second photosensitive element 71 are photodiodes. In this embodiment, when a voltage at a certain position in the detection control circuit is abnormal, the first reset element 191 clears the charges of each MOS transistor in the detection control circuit under the control of the reset control circuit, so that the circuit voltage of the detection control circuit returns to normal; similarly, when the voltage at a certain position in the acquisition unit circuit is abnormal, the second reset element 731 clears the charge of each MOS transistor in the acquisition unit circuit under the control of the reset control circuit, so that the circuit voltage of the acquisition unit circuit returns to normal.
The fingerprint identification circuit provided by the invention comprises a plurality of detection control circuits and a plurality of acquisition unit circuits, wherein in the fingerprint identification circuit, the detection control circuits are circuit units which have the functions of detecting whether a finger is pressed, determining the fingerprint acquisition time of the whole fingerprint identification circuit and acquiring fingerprint information; the acquisition unit circuit is a circuit unit only having a fingerprint information acquisition function, and the time node for starting fingerprint information acquisition and the time for carrying out photoelectric conversion and continuously acquiring fingerprint information of the acquisition unit circuit are regulated and controlled by a control circuit in the fingerprint identification circuit according to the detection result of the detection control circuit.
Specifically, referring to the fingerprint identification display device shown in fig. 1, when a finger is pressed against the screen surface of the display panel 61, the intensities of the light reflected from the edges and the center of the finger received by the optical fingerprint chip 31 are different, so that the preset on values of the identification switch elements 13 on the plurality of detection control circuits corresponding to the edge area of the finger are different from the preset on values of the identification switch elements 13 on the plurality of detection control circuits corresponding to the center area of the finger. Therefore, the identification switch elements 13 on the detection control circuits corresponding to the edge region of the finger respectively collect the intensity of the light reflected by the edge of the finger, and the minimum light intensity value is obtained through one common light intensity detection circuit, the identification switch elements 13 on the detection control circuits corresponding to the center region of the finger respectively collect the intensity of the light reflected by the center of the finger, and the minimum light intensity value is obtained through another common light intensity detection circuit, then the fingerprint identification circuit respectively judges whether the minimum light intensity value acquired from the edge and the minimum light intensity value acquired from the center meet the minimum starting requirement, when the minimum light intensity value acquired from the edge and the minimum light intensity value acquired from the center both meet the preset light intensity threshold value, the control circuit in the fingerprint identification circuit controls all the photodiodes (i.e. the first photosensitive elements 171 in all the detection control circuits and the second photosensitive elements 71 in all the acquisition unit circuits) to start fingerprint acquisition, and the time length of collecting the current fingerprint is determined according to the smaller value of the minimum value of the light intensity collected by the detection control circuit from the edge and the minimum value of the light intensity collected by the detection control circuit from the center.
In this embodiment, as shown in fig. 8, the first photosensitive elements 171 of the detection control circuit are correspondingly distributed in the first area 613 of the display panel 61, and the second photosensitive elements 71 of the acquisition unit circuit are correspondingly distributed in the second area 615 of the display panel 61.
According to the optical fingerprint module, the micro-focusing lens is arranged on the optical fingerprint chip in a matched mode, so that more light reflected by the pressing finger is irradiated onto the photosensitive element of the optical fingerprint chip, and the fingerprint imaging quality in a fingerprint collection environment with dark light rays is improved; this optical fingerprint module and display panel cooperation fingerprint identification display device who obtains, because on the optical fingerprint chip still including can press down the fingerprint identification circuit that detects and can carry out the long control of fingerprint collection time, can effectively avoid the optical fingerprint module to press the mistake discernment under the condition at the non-fingerprint, improve the reliability of optical fingerprint module, be favorable to reducing the consumption, accelerate fingerprint collection speed, even realize that light condition is darker, the light intensity that the optical fingerprint chip sensing arrived also can reach the threshold value that the fingerprint collection was opened to the optical fingerprint module, the imaging quality of optical fingerprint module has been improved, sensitivity and reliability, fingerprint identification display device's performance has been improved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An optical fingerprint module (30) is characterized by comprising an optical fingerprint chip (31), the optical fingerprint chip (31) comprises a photosensitive layer (35) and a micro-focusing lens (41), the photosensitive layer (35) comprises a plurality of photosensitive elements (37) distributed at intervals, the micro focusing lens (41) is arranged above the photosensitive layer (35), the micro focusing lens (41) comprises a plurality of light-gathering parts (43) distributed at intervals, the light-gathering parts (43) are convex spherical, a plurality of light-gathering parts (43) and a plurality of photosensitive elements (37) are distributed in a one-to-one corresponding way, micro focus lens (41) still includes a plurality of interval portions (45), and every two are adjacent be equipped with one between spotlight portion (43) interval portion (45), it is adjacent form sensitization unit clearance (371) between sensitization component (37), and is a plurality of interval portion (45) and a plurality of sensitization unit clearance (371) one-to-one distributes.
2. The optical fingerprint module (30) of claim 1, wherein the top surface of the spacer portion (45) is planar, and the top surface of the spacer portion (45) is lower than the top surface of the light-gathering portion (43) so as to form a recess at the spacer portion (45).
3. The optical fingerprint module (30) of claim 1, wherein the top surface of the spacer portion (45) is planar, and the top surface of the spacer portion (45) is higher than the top surface of the light-focusing portion (43).
4. Optical fingerprint module (30) according to claim 2 or 3, wherein the surface of the spacer (45) is provided with a black film layer.
5. The optical fingerprint module (30) of claim 4, wherein the area of the black film layer on the spacing portion (45) of the micro-focusing lens (41) projected onto the optical fingerprint chip (31) is smaller than the area of the corresponding photosensitive cell gap (371), and the area of the light-condensing portion (43) projected onto the optical fingerprint chip (31) is larger than the area of the corresponding photosensitive element (37).
6. The optical fingerprint module (30) of claim 1, wherein the optical fingerprint module (30) further comprises an optical lens assembly (51) and a first optical filter layer (53), the optical lens assembly (51) being disposed over the optical fingerprint chip (31), the first optical filter layer (53) being disposed between the optical lens assembly (51) and the optical fingerprint chip (31).
7. The optical fingerprint module (30) of claim 1, wherein the optical fingerprint chip (31) further comprises a wiring layer (391), a substrate (393), a second filter layer (395) and an upper cover plate (397), the wiring layer (391) is formed on the substrate (393), the photosensitive layer (35) is disposed on the wiring layer (391), the second filter layer (395) is disposed between the photosensitive layer (35) and the micro-focusing lens (41), and the upper cover plate (397) is disposed on the micro-focusing lens (41).
8. A fingerprint identification display device, comprising a display panel (61) and an optical fingerprint module (30) as claimed in any one of claims 1 to 7, wherein the optical fingerprint module (30) is disposed below the display panel (61).
9. The fingerprint identification display device according to claim 8, wherein the optical fingerprint module (30) further comprises a fingerprint identification circuit, the fingerprint identification circuit comprises a plurality of detection control circuits, a plurality of acquisition unit circuits and a power supply (11), the detection control circuit comprises an identification switch element (13), an exposure control element (15) and a photoelectric conversion circuit (17), the identification switch element (13), the exposure control element (15) and the photoelectric conversion circuit (17) are sequentially connected, the identification switch element (13) is further connected to the light intensity detection circuit, the identification switch element (13) is used for switching on or off the connection between the power supply (11) and the input end of the exposure control element (15) according to the light intensity detected by the light intensity detection circuit, and the exposure control element (15) is used for controlling the exposure control element (15) to connect the identification switch element (13) with the input end of the exposure control element (15) according to the light intensity The photoelectric conversion circuit (17) has a short time, the photoelectric conversion circuit (17) comprises a first photosensitive element (171), and the photoelectric conversion circuit (17) is used for converting a received optical signal into a corresponding electric signal and outputting the electric signal to a signal output line when the identification switch element (13) is communicated with the first photosensitive element (171);
the acquisition unit circuit comprises a second photosensitive element (71), the second photosensitive element (71) is used for converting an optical signal received by the second photosensitive element into a corresponding electric signal when the identification switch element (13) in the detection control circuit is communicated with the first photosensitive element (171), and the acquisition unit circuit determines whether to convert the received optical signal into the corresponding electric signal and determines the time for continuously converting the received optical signal into the corresponding electric signal and outputting the corresponding electric signal to a signal output line according to the detection control circuit;
the display panel (61) comprises a fingerprint identification area, the fingerprint identification area comprises a first area (613) and a second area (615), the first photosensitive element (171) of the detection control circuit is arranged corresponding to the first area (613), and the second photosensitive element (71) of the acquisition unit circuit is arranged corresponding to the second area (615).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175134.XA CN110008840B (en) | 2019-03-08 | 2019-03-08 | Optical fingerprint module and fingerprint identification display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175134.XA CN110008840B (en) | 2019-03-08 | 2019-03-08 | Optical fingerprint module and fingerprint identification display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110008840A CN110008840A (en) | 2019-07-12 |
| CN110008840B true CN110008840B (en) | 2022-02-01 |
Family
ID=67166640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910175134.XA Active CN110008840B (en) | 2019-03-08 | 2019-03-08 | Optical fingerprint module and fingerprint identification display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110008840B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113544695B (en) * | 2020-02-19 | 2024-04-12 | 京东方科技集团股份有限公司 | Photosensitive detection circuit, optical signal detection method, device and system and display device |
| CN111325168A (en) * | 2020-02-26 | 2020-06-23 | 武汉华星光电技术有限公司 | Display panel and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1104908A1 (en) * | 1998-09-16 | 2001-06-06 | Lsi Card Corporation | Optical apparatus, fingerprint pickup apparatus and fingerprint pickup method |
| CN1321279A (en) * | 1998-11-12 | 2001-11-07 | 赛寇根公司 | High contrast, low distortion optical acquisition system for image capturing |
| CN104318204A (en) * | 2014-09-29 | 2015-01-28 | 上海箩箕技术有限公司 | Fingerprint imaging system and method, fingerprint identification system, electronic apparatus |
| CN105550664A (en) * | 2016-01-08 | 2016-05-04 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN106022324A (en) * | 2016-08-04 | 2016-10-12 | 京东方科技集团股份有限公司 | Line recognition and display device |
| CN106228147A (en) * | 2016-08-04 | 2016-12-14 | 京东方科技集团股份有限公司 | A kind of lines harvester, its lines acquisition method and display device |
| CN107590421A (en) * | 2016-07-08 | 2018-01-16 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
-
2019
- 2019-03-08 CN CN201910175134.XA patent/CN110008840B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1104908A1 (en) * | 1998-09-16 | 2001-06-06 | Lsi Card Corporation | Optical apparatus, fingerprint pickup apparatus and fingerprint pickup method |
| CN1321279A (en) * | 1998-11-12 | 2001-11-07 | 赛寇根公司 | High contrast, low distortion optical acquisition system for image capturing |
| CN104318204A (en) * | 2014-09-29 | 2015-01-28 | 上海箩箕技术有限公司 | Fingerprint imaging system and method, fingerprint identification system, electronic apparatus |
| CN105550664A (en) * | 2016-01-08 | 2016-05-04 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN107590421A (en) * | 2016-07-08 | 2018-01-16 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN106022324A (en) * | 2016-08-04 | 2016-10-12 | 京东方科技集团股份有限公司 | Line recognition and display device |
| CN106228147A (en) * | 2016-08-04 | 2016-12-14 | 京东方科技集团股份有限公司 | A kind of lines harvester, its lines acquisition method and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110008840A (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109961023B (en) | Detection control circuit, fingerprint identification circuit and optical fingerprint module | |
| CN110062931B (en) | Fingerprint identification device, fingerprint identification method and electronic equipment | |
| US9501686B2 (en) | Multi-purpose thin film optoelectric sensor | |
| US20200089928A1 (en) | Optical image capturing unit, optical image capturing system and electronic device | |
| CN107346152B (en) | Display device, display screen and terminal | |
| CN106847872B (en) | Display device | |
| JP3473658B2 (en) | Fingerprint reader | |
| CN108629269B (en) | Optical imaging apparatus | |
| CN108304803B (en) | Photodetection circuit, photodetection method, and display device | |
| CN111095282A (en) | Fingerprint detection device and electronic equipment | |
| CN110059562B (en) | Display device and electronic device | |
| WO2020056728A1 (en) | Optical image collection unit, optical image collection system, and electronic device | |
| CN212624070U (en) | Fingerprint sensing module | |
| CN110008840B (en) | Optical fingerprint module and fingerprint identification display device | |
| WO2020061823A1 (en) | Optical image acquisition unit, optical image acquisition apparatus and electronic device | |
| JP2009110452A (en) | Imaging device, method of manufacturing imaging device, and apparatus equipped with imaging device | |
| CN113591676A (en) | Active pixel sensor, display panel, electronic apparatus, and drive control method | |
| CN111582249A (en) | Fingerprint identification sensor, display panel and manufacturing method of fingerprint identification sensor | |
| CN210072645U (en) | Microlens light path structure for OLED screen fingerprint identification and electronic equipment | |
| CN114495181A (en) | Electronic equipment | |
| CN113743156A (en) | Fingerprint detection module, electronic equipment, detection method and device and storage medium | |
| CN112070066A (en) | Display device and fingerprint identification method thereof | |
| CN209746566U (en) | Image sensor and fingerprint identification module suitable for optical fingerprint identification under screen | |
| CN108921112B (en) | Mobile terminal and flash lamp fingerprint identification assembly thereof | |
| CN210142328U (en) | Optical image acquisition unit, optical image acquisition system, and electronic apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201203 Address after: 3 / F, factory building No.1, No.3, Taihong Road, high tech Zone, Kunshan City, Suzhou City, Jiangsu Province Applicant after: Kunshanqiu titanium biometric technology Co., Ltd Address before: 215300 No. 3 Rainbow Road, Kunshan hi tech Industrial Development Zone, Jiangsu, Suzhou Applicant before: KUNSHAN Q TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |