CN109961023B - Detection control circuit, fingerprint identification circuit and optical fingerprint module - Google Patents
Detection control circuit, fingerprint identification circuit and optical fingerprint module Download PDFInfo
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- CN109961023B CN109961023B CN201910175141.XA CN201910175141A CN109961023B CN 109961023 B CN109961023 B CN 109961023B CN 201910175141 A CN201910175141 A CN 201910175141A CN 109961023 B CN109961023 B CN 109961023B
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
A detection control circuit comprises a power supply, an identification switch element, an exposure control element and a photoelectric conversion circuit which are sequentially connected, wherein the identification switch element is also connected with a light intensity detection circuit and 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; a fingerprint identification circuit comprises a plurality of detection control circuits; an optical fingerprint module comprises the fingerprint identification circuit. The detection control circuit, the fingerprint identification circuit and the optical fingerprint module provided by the invention can avoid the misidentification of fingerprint acquisition and realize higher fingerprint acquisition rate.
Description
Technical Field
The invention relates to the technical field of fingerprint identification, in particular to a detection control circuit, a fingerprint identification circuit and an optical fingerprint module.
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.
Among the present optics fingerprint module, single collection unit on the optics fingerprint chip is by a photodiode, an MOS pipe (metal oxide semiconductor field effect transistor, metal oxide semiconductor factor) is constituteed, when photodiode sensing on the optics fingerprint chip arouses photoelectric conversion to illumination and this irradiant intensity, the optics fingerprint chip will begin to carry out the fingerprint collection, the problem that the illumination of optics fingerprint chip sensing produced the misidentification when so will have the non-finger touch, in addition, when the comprehensive screen cell-phone of optics fingerprint module collocation used, still there was collection rate slower, experience the relatively poor problem of effect.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a detection control circuit, a fingerprint identification circuit and an optical fingerprint module so as to avoid the false identification of fingerprint acquisition and realize faster fingerprint acquisition rate.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
according to an aspect of the present invention, there is provided a detection control circuit including a power supply, an identification switch element, an exposure control element, and a photoelectric conversion circuit, the identification switch element and the exposure control element are connected with the photoelectric conversion circuit in sequence, the identification switch element is also connected with a light intensity detection circuit and is used for switching on or 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 comprises a first photosensitive element, and 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 is communicated with the first photosensitive element.
The detection control circuit can perform finger pressing detection and fingerprint acquisition duration control, can avoid error identification of fingerprint acquisition and realize faster fingerprint acquisition rate.
In one embodiment, the photoelectric conversion circuit further includes a first row and column selection element and a first signal processing circuit, the identification switch element, the exposure control element, the first signal processing circuit and the first row and column selection element are sequentially connected, and the first photosensitive element is disposed between the exposure control element and the first signal processing circuit; the first electrode of the first photosensitive element is connected with the first signal processing circuit, the second electrode of the first photosensitive element is connected with a reference voltage end, the first photosensitive element is used for converting a received optical signal into a corresponding electric signal, the first signal processing circuit is used for processing the electric signal received by the first photosensitive element, the first row and column selection element is further connected with a row and column control circuit, and the first row and column selection element is used for controlling whether the electric signal output by the first signal processing circuit is output to a signal output line or not according to the signal of the row and column control circuit.
In one embodiment, the exposure control element is further connected to an exposure control circuit, and the control end, the input end and the output end of the identification switch element are respectively connected to the light intensity detection circuit, the power supply and the input end of the exposure control element, and are used for switching on or 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 control end of the exposure control element is connected with the exposure control circuit, and the output end of the exposure control element is connected with the first electrode of the first photosensitive element; the input end of the first row and column selection element is connected with the first signal processing circuit, the control end of the first row and column selection element is connected with the row and column control circuit, the output end of the first row and column selection element is connected with the signal output line, and the first row and column selection element is used for turning on or off the connection between the input end and the output end of the first row and column selection element according to a signal of the row and column control circuit and outputting an electric signal output by the first signal processing circuit to the signal output line when the first row and column selection element is turned on.
In one embodiment, the first signal processing circuit comprises a first reset element, a first filter element, and a first signal following element; the control end, the input end and the output end of the first filter element are respectively connected with the noise removal control circuit, the first photosensitive element and the control end of the first signal following element, and the first filter element is used for filtering the dark current signal output by the first photosensitive element under the control of the noise removal control circuit; the input end, the control end and the output end of the first reset element are respectively connected with the power supply, the reset control circuit and the output end of the first filter element, and the first reset element is used for resetting the circuit voltage of the detection control circuit under the control of the reset control circuit; the control end, the input end and the output end of the first signal following element are respectively connected with the output end of the first reset element, the power supply and the input end of the first row selection element, and the first signal following element is used for following and amplifying the electric signal output by the first filter element and outputting the obtained following and amplified signal to the first row selection element.
In one embodiment, the light intensity detection circuit outputs a current signal according to the light intensity when detecting light, controls the identification switch element to be switched on or off according to the magnitude of the current signal, and controls the identification switch element to be switched on when the current signal reaches a preset current.
In one embodiment, the exposure control circuit determines the time for the exposure control element to communicate the identification switch element with the first photosensitive element according to the time required for the charge amount of the current output by the signal output line to reach a preset charge amount when the exposure control element is turned on last time.
According to another aspect of the present invention, a fingerprint identification circuit is provided, which comprises a plurality of the above detection control circuits and a plurality of the acquisition unit circuits.
The fingerprint identification circuit is additionally provided with the detection control circuit which can carry out finger pressing detection and fingerprint acquisition duration control, can effectively avoid error identification under the condition of non-fingerprint pressing, and is beneficial to reducing the power consumption of the circuit and accelerating the acquisition rate of fingerprints.
In one embodiment, the collecting unit circuit includes a second photosensitive element, the second photosensitive element is configured to convert a received optical signal into a corresponding electrical signal when the identification switch element in the detection control circuit is communicated with the first photosensitive element, and the collecting unit circuit determines whether to convert the received optical signal into the corresponding electrical signal and determines the duration of time for continuously converting the received optical signal into the corresponding electrical signal and outputting the corresponding electrical signal to the signal output line according to the detection control circuit.
In one embodiment, the acquisition unit circuit further includes a second signal processing circuit and a second row-column selection element, the second photosensitive element, the second signal processing circuit and the second row-column selection element are sequentially connected, the second signal processing circuit is configured to receive and process the electrical signal output from the second photosensitive element, the second row-column selection element is further connected to a row-column control circuit, and the second row-column selection element is configured to control whether to output the electrical signal output from the second signal processing circuit to a signal output line according to a signal of the row-column control circuit.
According to another aspect of the present invention, there is also provided an optical fingerprint module, wherein the optical fingerprint chip includes the fingerprint identification circuit; the optical fingerprint module includes optical fingerprint chip, optical fingerprint chip includes photosensitive layer and little focus lens, the photosensitive layer includes a plurality of interval distribution's photosensitive element, photosensitive element includes first photosensitive element, little focus lens is located the top of photosensitive layer, little focus lens includes a plurality of interval distribution's spotlight portion, spotlight portion is the convex sphere form, a plurality of spotlight portions with a plurality of photosensitive element one-to-one distribute.
The optical fingerprint module comprises the fingerprint identification circuit which can perform finger pressing detection and can perform fingerprint acquisition time length control, can effectively avoid mistaken identification of the optical fingerprint module under the condition of non-finger pressing, improves the reliability of the optical fingerprint module, and is beneficial to reducing power consumption and accelerating the fingerprint acquisition speed.
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 region 615, a second region 621, incident light 623, reflected light 625, emitted light 63, an organic light-emitting layer 631, a pixel cell 633, a pixel gap 65, a protective layer 651, an opening region 71, a second photosensitive element 73, a second signal processing circuit 731, a first light-receiving element 191, a second signal processing circuit 191, a first reset element 193, a second reset element 195, a second filter element 41, a second filter element 51, a second filter element 53, a second filter element, a third element, a fourth element, a, A second reset element 733, a second filter element 735, a second signal following element 75, a second row-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 the exposure control element 15 to connect the identification switch element 13 and the photoelectric conversion circuit 17 according to the light intensity, 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 fingerprint identification circuit in the optical fingerprint chip comprises the detection control circuit which can perform finger pressing detection and can perform fingerprint acquisition time control, so that the error identification of the optical fingerprint module under the condition of non-finger pressing can be effectively avoided, the reliability of the optical fingerprint module is improved, the power consumption is favorably reduced, and the fingerprint acquisition speed is accelerated; simultaneously, the collocation sets up little focusing lens on the optics fingerprint chip, can realize even the light condition is darker, the light intensity that optics fingerprint chip sensing arrived also can reach the threshold value that the fingerprint was gathered to optics fingerprint module open, has improved imaging quality, sensitivity and the reliability of optics fingerprint module.
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 (10)
1. A detection control circuit is characterized by comprising a power supply (11), an identification switch element (13), an exposure control element (15) and a photoelectric conversion circuit (17), wherein the identification switch element (13) and the exposure control element (15) are sequentially connected with the photoelectric conversion circuit (17), the identification switch element (13) is further connected with a 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, the exposure control element (15) is used for controlling the time for communicating the identification switch element (13) with the photoelectric conversion circuit (17) through the exposure control element (15) according to the light intensity, and the photoelectric conversion circuit (17) comprises a first photosensitive element (171), the photoelectric conversion circuit (17) is used for converting the received optical signals into corresponding electric signals and outputting the electric signals to a signal output line when the identification switch element (13) is communicated with the first photosensitive element (171).
2. The detection control circuit according to claim 1, wherein the photoelectric conversion circuit (17) further comprises 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 this order, and the first photosensitive element (171) is provided between the exposure control element (15) and the first signal processing circuit (19);
the first electrode of the first photosensitive element (171) is connected with the first signal processing circuit (19), the second electrode of the first photosensitive element (171) is connected with a reference voltage terminal, the first photosensitive element (171) is used for converting a received optical signal into a corresponding electrical signal, the first signal processing circuit (19) is used for processing the electrical signal received from the first photosensitive element (171), the first row and column selection element (173) is further connected with a row and column control circuit, and the first row and column selection element (173) is used for controlling whether the electrical signal output from the first signal processing circuit (19) is output to a signal output line or not according to a signal of the row and column control circuit.
3. The detection control circuit according to claim 2, wherein the exposure control element (15) is further connected to an exposure control circuit, and the control terminal, the input terminal and the output terminal of the identification switch element (13) are respectively connected to the light intensity detection circuit, the power supply (11) and the input terminal of the exposure control element (15) for turning on or off the connection between the power supply (11) and the input terminal 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 end of the first row and column selection element (173) is connected with the first signal processing circuit (19), the control end of the first row and column selection element (173) is connected with the row and column control circuit, the output end of the first row and column selection element (173) is connected with the signal output line, the first row and column selection element (173) is used for turning on or off the connection between the input end and the output end of the first row and column selection element (173) according to the signal of the row and column control circuit, and the first row and column selection element (173) outputs the electric 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.
4. The detection control circuit according to claim 2, wherein the first signal processing circuit (19) comprises 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 following element (195), and the first filter element (193) is used for filtering the dark current signal output by the first photosensitive element (171) under the control of the denoising control circuit;
the input end, the control end and the output end of the first reset element (191) are respectively connected with the power supply (11), a reset control circuit and the output end of the first filter element (193), and the first reset element (191) is used for resetting the circuit voltage of the detection control circuit under the control of the reset control circuit;
the control end, the input end and the output end of the first signal follower element (195) are respectively connected with the output end of the first reset element (191), the power supply (11) and the input end of the first row selection element (173), and the first signal follower element (195) is used for carrying out following amplification on the electric signal output by the first filter element (193) and outputting the obtained following amplification signal to the first row selection element (173).
5. The detection control circuit according to claim 1, wherein 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.
6. The detection control circuit according to claim 3, wherein the exposure control circuit determines the length of time for which the exposure control element (15) communicates the identification switch element (13) and 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 a preset charge amount when the exposure control element (15) was previously turned on.
7. A fingerprint identification circuit comprising a plurality of detection control circuits according to any one of claims 1 to 6 and a plurality of acquisition unit circuits.
8. The fingerprint identification circuit of claim 7, wherein the collecting unit circuit comprises a second photosensitive element (71), the second photosensitive element (71) is used for converting the received optical signal into a corresponding electrical signal when the identification switch element (13) in the detection control circuit is communicated with the first photosensitive element (171), and the collecting unit circuit determines whether to convert the received optical signal into the corresponding electrical signal and the time for continuously converting the received optical signal into the corresponding electrical signal and outputting the corresponding electrical signal to the signal output line according to the detection control circuit.
9. The fingerprint recognition circuit of claim 8, wherein the acquisition unit circuit further comprises a second signal processing circuit (73) and a second row and column selection element (75), the second photosensitive element (71), the second signal processing circuit (73) and the second row and column selection element (75) are connected in sequence, the second signal processing circuit (73) is used for receiving and processing the electric signal output from the second photosensitive element (71), the second row and column selection element (75) is further connected to a row and column control circuit, and the second row and column selection element (75) is used for controlling whether to output the electric signal output from the second signal processing circuit (73) to a signal output line according to the signal of the row and column control circuit.
10. An optical fingerprint module (30) comprising an optical fingerprint chip (31), characterized in that the optical fingerprint chip (31) comprises a fingerprint recognition circuit according to any one of claims 7-9; the optical fingerprint chip (31) comprises a photosensitive layer (35) and a micro-focusing lens (41), wherein the photosensitive layer (35) comprises a plurality of photosensitive elements (37) distributed at intervals, the photosensitive elements (37) comprise first photosensitive elements (171), the micro-focusing lens (41) is arranged above the photosensitive layer (35), the micro-focusing lens (41) comprises a plurality of light-focusing parts (43) distributed at intervals, the light-focusing parts (43) are convex spherical, and the light-focusing parts (43) are distributed in a one-to-one correspondence manner with the photosensitive elements (37).
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| CN113739912B (en) * | 2020-05-29 | 2024-05-10 | 北京小米移动软件有限公司 | Optical signal detection module and light intensity detection method |
| CN112599064B (en) * | 2020-12-03 | 2022-09-09 | 深圳市华星光电半导体显示技术有限公司 | Display device and denoising method thereof |
| CN112883903B (en) * | 2021-03-12 | 2022-09-20 | 厦门天马微电子有限公司 | Display panel driving method and display device |
| WO2022261924A1 (en) * | 2021-06-18 | 2022-12-22 | 京东方科技集团股份有限公司 | Sensing circuit, detection control method, fingerprint recognition module, and display apparatus |
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