CN109564631A - Optical finger print sensing device and method for sensing under a kind of screen - Google Patents
Optical finger print sensing device and method for sensing under a kind of screen Download PDFInfo
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- CN109564631A CN109564631A CN201880002308.6A CN201880002308A CN109564631A CN 109564631 A CN109564631 A CN 109564631A CN 201880002308 A CN201880002308 A CN 201880002308A CN 109564631 A CN109564631 A CN 109564631A
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- sensing
- finger print
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- optical finger
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention discloses optical finger print sensing device and method for sensing under a kind of screen.Optical finger print sensing device includes an optical finger print sensing unit, one first scanning sensing circuit and one second scanning sensing circuit under the screen；Wherein optical finger print sensing unit includes multiple sensing regions, for carrying out the first exposure and the second exposure to respectively obtain the first sensing result and the second sensing result of the multiple sensing region；The time for exposure of first exposure is shorter than second exposure；The first scanning sensing obtains the first sensing result of each sensing region, and generates a weights accordingly；The second scanning sensing circuit sequentially exports the second sensing result of at least sensing region in the multiple sensing region according to the weights；In this way, the sensing result that the second scanning sensing circuit need not export whole sensing regions reduces the space to store data to effectively reduce the transmission of data quantity relatively.
Description
Technical field
The present invention relates to optical finger print sensing devices under tool optical finger print sensing device more particularly to a kind of screen.
Background technique
The effective optical sensing area for shielding lower optical finger print sensing device at present is small, and finger is easy to press partially, and can not have foot
Enough fingerprint feature points carry out identification of fingerprint, cause usage experience bad.
If using optical finger print sensing device under the screen of bigger effective optical sensing area, relative increase sensing document
Amount, under limited transmitting bandwidth, data transmission speed is slow, and the speed for recognizing fingerprint characteristic is also slack-off, still will cause another
The bad situation of kind usage experience.
Therefore, shield lower optical finger print sensing device at present and need further improvement and innovation.
Summary of the invention
It is above-mentioned to solve it is an object of the present invention to disclosing optical finger print sensing device and method for sensing under a kind of screen
Problem.
The embodiment of the application discloses optical finger print sensing device under a kind of screen.Optical finger print sensing dress under the screen
It sets including an optical finger print sensing unit, one first scanning sensing circuit and one second scanning sensing circuit；Wherein optical finger print
Sensing unit includes multiple sensing regions, for carrying out the first exposure and the second exposure to respectively obtain the multiple sensing area
First sensing result and the second sensing result in domain；Wherein the time for exposure of first exposure is shorter than second exposure；
The first scanning sensing circuit is connected to the multiple sensing region, to obtain the first sensing knot of each sensing region
Fruit, and a weights are generated accordingly；The second scanning sensing circuit is connected to the multiple sensing region, according to the power
Weight result sequentially exports the second sensing result of at least sensing region in the multiple sensing region.
The disclosure as set forth herein, which shields lower optical finger print sensing device, has multiple sensing regions, cooperation the first scanning sensing electricity
Road first carries out the assessment of weights to every one first sensing result, then scans sensing circuit foundation weights by second, according to
Sequence exports the second sensing result of at least sensing region in the multiple sensing region；In this way, the second scanning sensing circuit
The sensing result of whole sensing regions need not be exported, to effectively reduce the transmission of data quantity, reduces the space to store data relatively,
The defects of lower optical finger print sensing device is slow by inclined and identification of fingerprint speed, is shielded in solution simultaneously at present.
Another embodiment of the application discloses a kind of method for sensing of optical finger print sensing device under screen.The sensing side
Method is the following steps are included: make the multiple sensing region carry out the first exposure, to obtain the first sensing knot of each sensing region
Fruit；According to the first sensing result of each sensing region, a weights are generated；Make the multiple sensing region carry out second to expose
Light, to obtain the second sensing result of each sensing region；Wherein the time for exposure of first exposure is shorter than described second and exposes
Light；And the second sensing of at least sensing region in the multiple sensing region is sequentially exported according to the weights
As a result.
The method for sensing of optical finger print sensing device is in the first sense for obtaining each sensing region under screen disclosed herein
After surveying result, the weights of every one first sensing result are first assessed, then according to weights, sequentially export the multiple sensing
Second sensing result of at least sensing region in region；Therefore, the application method for sensing can effectively reduce the biography of data quantity
Space that is defeated, also storing data with respect to reduction, while solution shields lower optical finger print sensing device by inclined and identification of fingerprint speed at present
Spend the defects of slow.
Another embodiment of the application discloses a kind of hand-held device, comprising: a display screen；An and optical finger print under screen
Sensing device is arranged under the display screen, and includes: an optical finger print sensing unit, including multiple sensing regions, be used into
The exposure of row first and the second exposure are tied with the first sensing result for respectively obtaining the multiple sensing region and the second sensing
Fruit, wherein the time for exposure of first exposure is shorter than second exposure；One first scanning sensing circuit, is connected to described more
A sensing region generates a weights to obtain the first sensing result of each sensing region accordingly；And one
Two scanning sensing circuits, are connected to the multiple sensing region, and the second scanning sensing circuit comes according to the weights
Sequentially export the second sensing result of at least sensing region in the multiple sensing region.
Optical finger print sensing device has multiple sensing regions under the screen of hand-held device disclosed herein, and cooperation first is swept
The assessment that sensing circuit first carries out weights to every one first sensing result is retouched, then by the second scanning sensing circuit according to weight
As a result, sequentially exporting the second sensing result of at least sensing region in the multiple sensing region；In this way, the second scanning sense
Slowdown monitoring circuit need not export the sensing result of whole sensing regions, and to effectively reduce the transmission of data quantity, opposite reduce stores data
Space, while solving the defects of optical finger print sensing device is slow by inclined and identification of fingerprint speed under the screen of current hand-held device.
Detailed description of the invention
Figure 1A is the appearance diagram that optical finger print sensing device is applied to hand-hold device under the application screen.
Figure 1B be the application display screen sum screen under optical finger print sensing device schematic diagram.
Fig. 2 is the functional block diagram of optical finger print sensing device under the application screen.
Fig. 3 A is the upper view plane schematic diagram of the first embodiment of optical finger print sensing unit.
Fig. 3 B is the upper view plane schematic diagram of the second embodiment of optical finger print sensing unit.
The functional block diagram of the scanning sensing circuit of Fig. 4 the application first.
Fig. 5 the application obtains the flow chart of the default correcting image of multiple sensing regions of optical finger print sensing unit.
Fig. 6 the application carries out the flow chart of Concordance to every one first sensing result.
The flow chart of the method for sensing of optical finger print sensing device under Fig. 7 the application screen.
Wherein, the reference numerals are as follows:
1 hand-held device
10 display screens
11 display panels
111 first sides
112 second side
12 cover sheets
Optical finger print sensing device under 20 screens
21 optical finger print sensing units
210 sensing regions
211 first sensing results
The first sensing after 211' Concordance
As a result
The first sensing after 211a, 211b low-pass filter
As a result
Image after 212 low-pass filters
213 compensating gain images
214 default correcting images
22 first scanning sensing circuits
221 Concordance units
222 low-pass filters
223 weights assessment units
23 second scanning sensing circuits
30 finger print identification units
40 objects
Specific embodiment
Specification and preceding claims in used some vocabulary and censure specific component.This field
Technical staff is, it is to be appreciated that manufacturer may call same component with different nouns.This specification and preceding power
Sharp claim is not in such a way that the difference of title is as component is distinguished, but with the difference of component functionally as area
The benchmark divided.Specification in the whole text and preceding claims when mentioned in " comprising " be an open term, therefore
It should be construed to " including but not limited to ".
Optical finger print sensing device and its method for sensing under the screen of the application have larger effective optical sensing area,
But it does not cause identification of fingerprint speed to slow down due to sensing document amount becomes larger, cooperates multiple embodiments and schema below, be described in detail
The technology contents of the application display screen.
Referring initially to shown in Figure 1A and Figure 1B, optical finger print sensing device 20 is applied to hand-hold device under the application screen
In 1, optical finger print sensing device 20 is arranged under a display screen 10 of hand-held device 1 under a screen.Display screen 10 includes one aobvious
Show that panel 11 and a cover sheet 12, display panel 11 have one first side 111 and second side relative to the first side 111
112, cover sheet 12 is set to second side 112 of display panel 11, and shields lower optical finger print sensing device 20 and be set to display
First side 111 of panel 11 is located at display panel 11 between the lower optical finger print sensing device 20 of screen and cover sheet 12
It include an optical finger print sensing unit 21, one please refer to lower optical finger print sensing device 20 shown in Fig. 2, is shielded
First scanning sensing circuit 22 and one second scanning sensing circuit 23；Wherein optical finger print sensing unit 21 includes multiple sensing areas
Domain 210, for carrying out the first exposure and the second exposure to respectively obtain the first sensing result of the multiple sensing region 210
And second sensing result；Wherein the time for exposure of first exposure is shorter than second exposure.Optical finger print sensing unit
21 area can be greater than the area of general fingerprint, to increase the convenience of user, in the present embodiment, and optical finger print sensing unit
21 area can cover some or whole of the display screen 10 of hand-held device 1, this exposure is seldom limited.
In this exposure, multiple sensing regions 210 that optical finger print sensing unit 21 is included be can be in a manner of M*N
Arrangement, wherein M or N is the integer more than or equal to 1, and M*N is greater than 1.Fig. 3 A is a kind of configuration of optical finger print sensing unit, figure
Optical finger print sensing unit 21 in 3A includes that four sensing regions 210 are arranged in a manner of 1*4.Fig. 3 B is optical finger print sensing
Another configuration of unit, the optical finger print sensing unit 21a in Fig. 3 A include that four sensing regions 210 are arranged in a manner of 2*2
Column.In certain embodiments, optical finger print sensing unit 21 or 21a can be a single sensor, and sensing area is virtual
Ground is divided into the multiple sensing region 210；For example, optical finger print sensing unit 21 is long strip type sensor, using brick
Shape (Tile) partitioning scheme virtual grate goes out the sensing region of 1*4；Optical finger print sensing unit 21a is positive square sensor, is adopted
Go out the sensing region of 2*2 with bricked partitioning scheme virtual grate.In certain embodiments, optical finger print sensing unit 21 or 21a
It can be made of multiple independent sensors, each corresponding sensing region 210 of independent sensor, multiple independent sensings
Device simultaneously constitutes optical finger print sensing unit 21 or 21a shown in Fig. 3 A or 3B.Optical finger print shown in either Fig. 3 A or Fig. 3 B
Sensing unit 21,21a known optical finger print sensing unit has bigger effective optical sensing area.
Again as shown in Fig. 2, the first scanning sensing circuit 22 is connected to multiple sensing regions 210, when multiple sensing regions 210
After carrying out the first exposure, the first scanning sensing circuit 22 can be obtained the first sensing result of each sensing region 210, and accordingly
Generate a weights.It please cooperate shown in Fig. 4, the first scanning sensing circuit 22 may include Concordance unit 221, low pass filtered
Wave device 222 and weights assessment unit 223, it is noted that, other than weights assessment unit 223, Concordance list
Member 221 and/or low-pass filter 222 can be omitted optionally.When the first scanning sensing circuit 22 obtains each sensing region 210
After first sensing result 211, every one first sensing result 211 first can be carried out by Concordance by Concordance unit 221
Afterwards, then by low-pass filter 222 to the first sensing result after Concordance low-pass filtering treatment is carried out to obtain first
Sensing result.For example, the obtained sensing result of two sensing regions 210 is depicted in Fig. 4 by Concordance list
Member 221 and low-pass filter 222 are obtained as a result, respectively the first sensing result 211a and the second sensing result after handling
211b。
Since multiple sensing regions 210 are there may be shade shadow effect (shading effect), and multiple sensing areas
It is corresponding even if carrying out the exposure of same time under identical environment also there may be because of the difference caused by processing procedure between domain 210
Still may be non-fully identical between multiple first sensing results of multiple sensing regions 210, or even have considerable error；Therefore,
It is preferably available before multiple first sensing results to multiple sensing regions 210 carry out weights assessment unit 223
Concordance unit 221 first carries out Concordance to multiple first sensing results of multiple sensing regions 210, such as Fig. 4 institute
Show.
Again please refer to shown in Fig. 5, to carry out further description to above-mentioned Concordance.Above-mentioned consistency school
Positive unit 221 needs a default correction when multiple first sensing results to multiple sensing regions 210 carry out Concordance
Image (or being default checking list) 214, and each sensing region 210 has corresponding default correcting image 214.Citing comes
It says, before optical finger print sensing device 20 is dispatched from the factory under screen, the processing of Fig. 5 can be carried out, to every one first sensing result 211 first to obtain
Correcting image 214 must be preset.Specifically, the generation for presetting correcting image 214 is first by the first sensing result 211 by low pass
An image 212 is obtained after filtering processing, then calculates a compensating gain (gain) 213 to correct shadow effect, and/or correction is often
The luminance reference of a sensing region 210 makes each sensing region 210 after compensating gain, same brightness case can be with
Obtain similar brightness value.Compensating gain 213 can further boil down to smaller size default correcting image 214, avoid occupying
Excessive storage space.
As shown in fig.6, Concordance unit 221 to every one first sensing result 211 carry out Concordance when,
First the compression of default correcting image 214 can be restored, become the compensating gain of the size as the first sensing result 211
213, and every one first sensing result 211 and corresponding compensating gain 213 are subjected to operation, to obtain compensated first sensing
As a result 211'.
Then, Fig. 4 is returned to, then by 223 pairs of weights assessment unit every one first sensings by low-pass filtering treatment
As a result the assessment of weights is carried out, in this present embodiment, the brightness of the first sensing result 220a is with respect to the first sensing result
It is more average for 220b, and average brightness is darker, in other words, the first sensing result 220a shows no light leakage phenomena or light leakage
Degree is low, represents its corresponding sensing region 210 all or close to all being pressed by finger object 40, and the first sensing result
The brightness of 220b is more unequal with respect to for the first sensing result 220a, and average brightness is darker, in other words, the first sensing knot
Fruit 220b shows light leakage phenomena or light leakage degree is high, represents its corresponding sensing region 210 and only has part by finger object 40
Pressing.Therefore, for the finger object 40 in pressing at present, sensing area corresponding to the first sensing result 211a of no light leakage
Domain 210 includes at most effective fingerprint information, and having sensing region 210 corresponding to the first sensing result 211b of light leakage includes phase
To less effective fingerprint information；In conclusion in order to distinguished in multiple sensing regions 210 by current finger object 40 by
The maximum wherein several sensing regions 210 of pressure surface product, can be according to the bright of every one first sensing result Jing Guo low-pass filtering treatment
Degree is to assess its weights.
In this present embodiment, the weights assessment mode of weights assessment unit 223 is that estimation correspondence is described each
The average brightness value of first sensing result of sensing region, the average brightness value is higher, then corresponding sensing region weight is got over
It is low.This right exposure is not limited with this, also be can be used or is considered other data in light of actual conditions together as weights assessment mode.For example,
In the case that average brightness value gap is little, the first sensing result highest brightness value of the corresponding each sensing region of estimation and
Minimum brightness value, the more big then weight of gap are lower.For another example the brightness value of first sensing result is higher than the face of a critical value
Product ratio is bigger, then weight is lower.As shown in figure 4, the weights of the first sensing result 211a are higher than first to point (1023)
The score (46) of sensing result 211b；It proposes to indicate that the data of weights are only illustrated to use at this, does not limit specific weights
The representation of weight result.
Again as shown in Fig. 2, the second scanning sensing circuit 23 is connected to multiple sensing regions 210 and the first scanning sensing circuit
22, the second scanning sensing circuit 23 can scan weights caused by sensing circuit 22 according to first, to determine multiple senses
Region 210 is surveyed to export some or all of in multiple second sensing results after second exposes to finger print identification unit
30, it is often more important that, the second scanning sensing circuit 23 can determine described all or part of second according to the weights
Sensing result is exported to the priority of finger print identification unit 30.With embodiment shown in Fig. 4, by weights score up to
Low decision output sequence, cooperates shown in Fig. 3 A, finger object 40 is all pressed by a left side from right number come the 3rd sensing region, part
It presses by a left side from right number come the 2nd and the 4th sensing region, wherein again larger with the pressing area of the 2nd sensing region；Cause
This, the first scanning sensing circuit 22 can assess the score of the weights of this four sensing regions from high to low are as follows: the 3rd
Sensing region, the 2nd sensing region, the 4th sensing region, wherein the 1st sensing region does not have the score of weights.
Therefore, the second scanning sensing circuit 23 can be sequentially by the 3rd sensing region, the 2nd sensing region, the 4th sensing
Second sensing result in region is sent to finger print identification unit 30, carries out identification of fingerprint after being received by finger print identification unit 30；Such as
This, shielding lower optical finger print sensing device 20 is that need not transmit the second sensing result of all sensing regions 210 to identification of fingerprint list
Member 30.In certain embodiments, the second sensing result of the 3rd sensing region is sent to fingerprint by the second scanning sensing circuit 23
After identification unit 30, if the expression of finger print identification unit 30 has recognized completion, the second scanning sensing circuit 23 just no longer receives remaining
Sensing region the second sensing result；Conversely, if the expression of finger print identification unit 30 can not recognize, the second scanning sensing circuit 23
Just the second sensing result of the 2nd sensing region is received again and is sent to finger print identification unit 30, until finger print identification unit 30
Instruction recognizes successfully.
From Fig. 7 with above description it is found that described in the method for sensing of optical finger print sensing device makes first under screen of the present invention
Multiple sensing regions carry out the first exposure, to obtain the first sensing result of each sensing region, then according to each sensing region
The first sensing result, generate a weights S11；Then, the multiple sensing region is made to carry out the second exposure, it is every to obtain
Second sensing result of one sensing region；Wherein the time for exposure of first exposure is shorter than the second exposure S12；Finally according to
The second sensing result S13 of at least sensing region in the multiple sensing region is sequentially exported according to the weights.
In the present embodiment, the time for exposure of second exposure is about three times of the time for exposure of first exposure.
In conclusion the method for sensing of optical finger print sensing device is obtaining each sensing under a kind of screen disclosed in the present application
After first sensing result in region, the weights of every one first sensing result are first assessed, then according to weights, sequentially export
Second sensing result of at least sensing region in the multiple sensing region；Therefore, the application method for sensing can effectively subtract
The transmission of few data quantity, the space also to store data with respect to reduction, while solving to shield at present lower optical finger print sensing device by inclined
And identification of fingerprint speed it is slow the defects of.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.It is all in the spirit and principles in the present invention, it is made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (20)
1. optical finger print sensing device under a kind of screen characterized by comprising
One optical finger print sensing unit, including multiple sensing regions, for carrying out the first exposure and the second exposure to obtain respectively
To the first sensing result and the second sensing result of the multiple sensing region, wherein the time for exposure of first exposure is short
In second exposure；
One first scanning sensing circuit is connected to the multiple sensing region to obtain the first of each sensing region the sensing
As a result, simultaneously generating a weights accordingly；And
One second scanning sensing circuit is connected to the multiple sensing region, and the second scanning sensing circuit is according to the power
Weight result sequentially exports the second sensing result of at least sensing region in the multiple sensing region.
Further comprise finger print identification unit 2. as described in claim 1 shield lower optical finger print sensing device, be used to according to according to
Second sensing result of at least sensing region in the multiple sensing region of sequence output carries out identification of fingerprint.
3. as described in claim 1 shield lower optical finger print sensing device, wherein the optical finger print sensing unit is single sense
Device is surveyed, and is virtually divided into the multiple sensing region.
4. as described in claim 1 shield lower optical finger print sensing device, wherein the optical finger print sensing unit is described more
A sensing region is respectively multiple independent sensors.
5. as described in claim 1 shield lower optical finger print sensing device, multiple sensing regions are arranged in a manner of M*N,
Middle M or N is the integer more than or equal to 1, and M*N is greater than 1.
6. as described in claim 1 shield lower optical finger print sensing device, the first scanning sensing circuit includes consistency school
Positive unit carries out Concordance for the first sensing result to each sensing region.
7. as claimed in claim 6 shield lower optical finger print sensing device, the Concordance includes shadow correction
(shading correction)。
8. as claimed in claim 7 shield lower optical finger print sensing device, the Concordance unit is according to a default correction
Table to the first sensing result of each sensing region carries out the shadow correction respectively.
9. as described in claim 1 shield lower optical finger print sensing device, the first scanning sensing circuit includes a low pass filtered
Wave device carries out low-pass filtering treatment for the first sensing result to each sensing region.
10. as described in claim 1 shield lower optical finger print sensing device, the first scanning sensing circuit is according to described each
The brightness of first sensing result of sensing region generates the weights.
11. the method for sensing of optical finger print sensing device under a kind of screen, under the screen optical finger print sensing device include have it is more
The optical finger print sensing unit of a sensing region, which comprises the following steps:
The multiple sensing region is set to carry out the first exposure, to obtain the first sensing result of each sensing region；
According to the first sensing result of each sensing region, a weights are generated；
The multiple sensing region is set to carry out the second exposure, to obtain the second sensing result of each sensing region；It is wherein described
The time for exposure of first exposure is shorter than second exposure；And
The second sensing knot of at least sensing region in the multiple sensing region is sequentially exported according to the weights
Fruit.
12. method for sensing as claimed in claim 11, in described the step of carrying out the first exposure, to every one first sense
It surveys result and carries out Concordance.
13. method for sensing as claimed in claim 12, the Concordance includes shadow correction (shading
correction)。
14. method for sensing as claimed in claim 13, the Concordance unit comes according to a default checking list to described
First sensing result of each sensing region carries out the shadow correction respectively.
15. method for sensing as claimed in claim 11, in described the step of carrying out the first exposure, to each sensing area
First sensing result in domain carries out low-pass filtering treatment.
16. method for sensing as claimed in claim 11, in the generation weights step, the weights are foundations
Produced by the brightness of first sensing result of each sensing region.
17. method for sensing as claimed in claim 11, the time for exposure of second exposure is about the exposure of first exposure
Three times between light time.
18. such as the method for sensing that claim 16 is stated, the higher weight of average brightness value of first sensing result is lower.
19. a kind of hand-held device characterized by comprising
One display screen；And
Optical finger print sensing device under one screen is arranged under the display screen, and includes:
One optical finger print sensing unit, including multiple sensing regions, for carrying out the first exposure and the second exposure to obtain respectively
To the first sensing result and the second sensing result of the multiple sensing region, wherein the time for exposure of first exposure is short
In second exposure；
One first scanning sensing circuit is connected to the multiple sensing region to obtain the first of each sensing region the sensing
As a result, simultaneously generating a weights accordingly；And
One second scanning sensing circuit is connected to the multiple sensing region, and the second scanning sensing circuit is according to the power
Weight result sequentially exports the second sensing result of at least sensing region in the multiple sensing region.
20. such as the hand-held device of claim 19, which is characterized in that the display screen includes a display panel and a protection cap
There is one first side and second side relative to first side, the cover sheet to be set to institute for plate, the display panel
Second side of display panel is stated, and optical finger print sensing device is set to the first side of the display panel under the screen, makes institute
Display panel is stated to be located under the screen between optical finger print sensing device and the cover sheet.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/115323 WO2020097807A1 (en) | 2018-11-14 | 2018-11-14 | Underscreen optical fingerprint sensing device and sensing method |
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| CN109564631A true CN109564631A (en) | 2019-04-02 |
| CN109564631B CN109564631B (en) | 2022-11-25 |
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| CN201880002308.6A Active CN109564631B (en) | 2018-11-14 | 2018-11-14 | Optical fingerprint sensing device and sensing method under screen |
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| WO (1) | WO2020097807A1 (en) |
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| CN112135065A (en) * | 2020-11-19 | 2020-12-25 | 深圳市汇顶科技股份有限公司 | Fingerprint detection method, fingerprint detection device and electronic equipment |
| TWI742477B (en) * | 2019-06-19 | 2021-10-11 | 神盾股份有限公司 | Electronic device |
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| Publication number | Publication date |
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| WO2020097807A1 (en) | 2020-05-22 |
| CN109564631B (en) | 2022-11-25 |
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