CN109472236A - A kind of full frame fingerprint recognition screen and fingerprint identification method - Google Patents
A kind of full frame fingerprint recognition screen and fingerprint identification method Download PDFInfo
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- CN109472236A CN109472236A CN201811298095.4A CN201811298095A CN109472236A CN 109472236 A CN109472236 A CN 109472236A CN 201811298095 A CN201811298095 A CN 201811298095A CN 109472236 A CN109472236 A CN 109472236A
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
- H10K59/65—OLEDs integrated with inorganic image sensors
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Abstract
The invention discloses a kind of full frame fingerprint recognition screen and fingerprint identification method, which includes touched panel glass, light collecting layer, OLED device and PD array；The light that the OLED device issues is penetrated and is exposed on the PD array after the light collecting layer optically focused after touched panel glass reception after the touched panel glass is reflected by finger.The present invention converges light using light collecting layer, both light will not be wasted, in turn ensures semaphore, the light for capableing of opponent's digital reflex time through light collecting layer converges, it is mapped to more illumination on PD array, the electric signals such as bigger electric current and voltage is generated on PD array so that subsequent conditioning circuit is more easier to handle.In addition, the full frame fingerprint recognition screen realizes optical path convergence using graded index layer, manufacturing cost is reduced.
Description
Technical field
The present invention relates to a kind of full frame fingerprint recognition screen and fingerprint identification methods.
Background technique
Fingerprint recognition has become the standard configuration of the mobile terminals such as mobile phone, iPad, however existing mobile phone still can not achieve it is full frame
Fingerprint recognition.
Currently, possess full frame identification technology has high pass and Beijing Han Wang, wherein high pass realizes full frame finger using ultrasonic wave
Line identification, however this is that high pass is engaged in without competition, technology is complicated, expensive.Beijing Han Wang is attached to lower driving using silicon wafer CIS
Back, as shown in Figure 1 and Figure 2；But OLED shines, digital reflex in one's hands is received by CIS again, and centre have passed through in drive substrate
Each layer metal, this will lead to light by erroneous reflections, eventually forms wrong identification.Therefore Han Wang limits optical path using aperture, with
Ensure the correct of optical path, but light can be wasted in this way, useful signal amount is caused to decline；And the size-constrained system of silicon substrate, price are high.
Summary of the invention
In order to solve the problems of in the prior art, the present invention it is in this be designed to provide one kind can generate compared with
Big electric signal guarantees the full frame fingerprint recognition screen of semaphore.
Full frame fingerprint recognition screen provided by the present invention includes touched panel glass, light collecting layer, OLED device and PD array；Institute
The light for stating OLED device sending penetrates after the touched panel glass is reflected by finger after touched panel glass reception through described
It is exposed to after light collecting layer optically focused on the PD array.
Further, full frame fingerprint recognition screen provided by the present invention further includes hole array, after the light collecting layer optically focused
Light exposed on the PD array by the hole array.It is realized using hole array and optical path is limited, it is ensured that optical path
Correctness.
It further, further include dividing on the basis of not being laid with hole array in full frame fingerprint recognition screen provided by the present invention
Layer and drive substrate, the layer of dividing fit between the OLED device and the drive substrate, and the PD array fits in
It the drive substrate and described divide between layer or fits under the drive substrate；The light collecting layer is located at the touch screen glass
Under glass or described divide in layer.
It further, further include putting down on the basis of being laid with hole array in full frame fingerprint recognition screen provided by the present invention
Booth layer and drive substrate, the layer of dividing fit between the OLED device and the drive substrate, the PD array fitting
In the drive substrate and described divide between layer or fit under the drive substrate；The light collecting layer is located at the touch screen
Under glass or it is described divide in layer, the hole array is set to described divide on layer or in the drive substrate.
Further, the light collecting layer is made of microlens array.
Further, the light collecting layer is graded index layer.Manufacturing cost is reduced using graded index layer.
The present invention to be designed to provide a kind of fingerprint identification method for also second herein, and this method is used for touch screen fingerprint
Identification, the light that touch screen issues are handled after digital reflex returns touch screen and carry out optically focused, and the illumination after optically focused is mapped to the PD battle array of touch screen
Electric signal is formed on column.The light of this method opponent's digital reflex be irradiated to after convergence light again to be formed on the PD array of touch screen
Electric signal will not both waste light, in turn ensure semaphore, be mapped to more illumination on PD array, generate on PD array bigger
Electric current and the electric signals such as voltage be more easier to handle so as to subsequent conditioning circuit.
The beneficial effects of the present invention are: the full frame fingerprint recognition screen converges light using light collecting layer, light will not be both wasted,
In turn ensuring semaphore, the light for capableing of opponent's digital reflex time through light collecting layer converges, and it is mapped to more illumination on PD array,
The electric signals such as bigger electric current and voltage are generated on PD array so that subsequent conditioning circuit is more easier to handle.
In addition, the full frame fingerprint recognition screen realizes optical path convergence using graded index layer, manufacturing cost is reduced.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing full frame fingerprint recognition screen；
Fig. 2 is existing full frame structural schematic diagram of the fingerprint recognition screen with hole array；
Fig. 3 is one of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of graded index layer；
Fig. 4 is the second structural representation of the full frame fingerprint recognition screen provided by the present invention being made of graded index layer；
Fig. 5 is the third structural representation of the full frame fingerprint recognition screen provided by the present invention being made of graded index layer；
Fig. 6 is the four of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of graded index layer；
Fig. 7 is one of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of self-focusing lens；
Fig. 8 is the second structural representation of the full frame fingerprint recognition screen provided by the present invention being made of self-focusing lens；
Fig. 9 is the third structural representation of the full frame fingerprint recognition screen provided by the present invention being made of self-focusing lens；
Figure 10 is the four of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of self-focusing lens；
Figure 11 is one of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of toroidal lens；
Figure 12 is the second structural representation of the full frame fingerprint recognition screen provided by the present invention being made of toroidal lens；
Figure 13 is the third structural representation of the full frame fingerprint recognition screen provided by the present invention being made of toroidal lens；
Figure 14 is the four of the structural schematic diagram of the full frame fingerprint recognition screen provided by the present invention being made of toroidal lens；
In figure: 1- touched panel glass, 2- light collecting layer, 3-OLED device, 4- photodiode, 5- via hole, 6- divide layer, 7- driving
Substrate；Line with the arrow is optical path in figure.
Specific embodiment
Further details of theory is made to claimed technical solution of the invention in this with specific embodiments and the drawings
It is bright.
Present invention technical solution claimed herein is a kind of full frame fingerprint recognition screen, can be used for full frame identification,
It can be used for part identification, which includes touched panel glass 1, light collecting layer 2, OLED device 3 and PD gusts
Column；The light that OLED device 3 issues penetrates to be gathered after the reception of touched panel glass 1 through light collecting layer 2 after touched panel glass 1 is reflected by finger
It is exposed to after light on PD array.
In order to limit optical path, it is ensured that the accuracy of optical path, which further includes hole array, through light collecting layer 2
5 array of light through hole after optically focused exposes on PD array.
Documented structure in the structure such as following several embodiments of full frame fingerprint recognition screen provided by the present invention, but simultaneously
Do not indicate that there is only following several structures.
Embodiment one
The structure of full frame fingerprint recognition screen in the embodiment as shown in figure 3, that includes touched panel glass 1, light collecting layer 2,
OLED device 3, divides layer 6 and drive substrate 7 at PD array；Wherein light collecting layer 2 is gradient index layer, and light collecting layer 2 can be laid in
It divides in version 6, but because light propagation has a distance, causes lighting effect not good enough, therefore light collecting layer 2 is fitted in touching by the present embodiment
Touch the lower surface of panel glass 1.OLED device 3, which is laid in, to be divided on layer 6, positioned at the lower section of light collecting layer 2；Drive substrate 7 fits in
The lower surface of layer 6 is divided, PD array is made of several photodiodes 4, fits in the lower surface of drive substrate 7.In order to make through
Light after roofing lens can be preferably irradiated on PD array, and photodiode 4 in PD array is laid in light collecting layer 2 herein
Underface, form photodiode 4 and 2 face structure of light collecting layer.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through gradually
It is exposed on PD array after becoming refracting layer optically focused.
Embodiment two
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in Figure 4 comprising touched panel glass 1, light collecting layer
2, OLED device 3, the PD array being made of several photodiodes 4, hole array, divide layer 6 and drive substrate 7；Wherein optically focused
Layer 2 is gradient index layer, and light collecting layer 2, which can be laid in, to be divided in version 6, but because light propagation has a distance, illumination is caused to be imitated
Fruit is not good enough, therefore light collecting layer 2 is fitted in the lower surface of touched panel glass 1 by the present embodiment.
Hole array is made of several independent via holes 5, is passed through convenient for optical path, and can limit optical path, it is ensured that light
The accuracy on road；Hole array is laid in drive substrate 7, and hole array rule or irregular can be laid in drive substrate 7；
It directly opens up several via holes 5 in the present embodiment in drive substrate 7 herein and constitutes hole array.
Drive substrate 7 fits in the lower surface for dividing layer 6, and PD array fits in the lower surface of drive substrate 7.In order to make light
Road can be preferably irradiated on PD array, and light collecting layer 2, via hole 5 and photodiode 4 are located at same perpendicular, 5 He of via hole
The quantity of photodiode 4 is equal or different.
Gather when the light that OLED device 3 issues penetrates to pass through after the reception of touched panel glass 1 after touched panel glass 1 is reflected by finger
Optical path limitation is carried out through hole array again after 2 optically focused of photosphere to expose on PD array.
Embodiment three
The structure of full frame fingerprint recognition screen in the embodiment as shown in figure 5, that includes touched panel glass 1, light collecting layer 2,
OLED device 3, divides layer 6 and drive substrate 7 at PD array；Wherein light collecting layer 2 is gradient index layer, and light collecting layer 2 can be laid in
It divides in version 6, but because light propagation has a distance, causes lighting effect not good enough, therefore light collecting layer 2 is fitted in touching by the present embodiment
Touch the lower surface of panel glass 1.OLED device 3, which is laid in, to be divided on layer 6, and PD array is made of several photodiodes 4, is fitted in
It divides between layer 6 and drive substrate 7.In order to enable the light after roofing lens to be preferably irradiated on PD array, herein will
Photodiode 4 is laid in the underface of light collecting layer 2 in PD array, forms photodiode 4 and 2 face structure of light collecting layer.
Gather when the light that OLED device 3 issues penetrates to pass through after the reception of touched panel glass 1 after touched panel glass 1 is reflected by finger
It is exposed on PD array after 2 optically focused of photosphere.
Example IV
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in Figure 6 comprising touched panel glass 1, light collecting layer
2, OLED device 3, the PD array being made of several photodiodes 4, hole array, divide layer 6 and drive substrate 7；Wherein optically focused
Layer 2 is gradient index layer, and light collecting layer 2, which can be laid in, to be divided in version 6, but because light propagation has a distance, illumination is caused to be imitated
Fruit is not good enough, therefore the present embodiment is fitted in the lower surface of touched panel glass 1.
Hole array is made of several independent via holes 5, is passed through convenient for optical path, and can limit optical path, it is ensured that light
The accuracy on road；Hole array, which is laid in, to be divided in layer 6, hole array can rule or irregular be laid in divide in layer 6；This reality
It applies example and directly opens up several composition of via holes 5 hole arrays on dividing layer 6 herein.
OLED device 3, which is laid in, to be divided on layer 6, and PD array, which fits in, to be divided between layer 6 and drive substrate 7.In order to make light
Road can be preferably irradiated on PD array, and light collecting layer 2, via hole 5 and photodiode 4 are located at same perpendicular；5 He of via hole
The quantity of photodiode 4 is equal or different.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through by
Optical path limitation is carried out through hole array again after 2 optically focused of light collecting layer that toroidal lens is constituted to expose on PD array.
Embodiment five
The structure of full frame fingerprint recognition screen in the embodiment as shown in fig. 7, that includes touched panel glass 1, light collecting layer 2,
OLED device 3, divides layer 6 and drive substrate 7 at PD array；Wherein light collecting layer 2 is arranged to make up by several self-focusing lens, optically focused
Layer 2, which can be laid in, to be divided in version 6, but because light propagation has a distance, causes lighting effect not good enough, therefore the present embodiment will gather
Photosphere 2 fits in the lower surface of touched panel glass 1.OLED device 3, which is laid in, to be divided on layer 6, and is set with self-focusing lens dislocation
It sets；Drive substrate 7 fits in the lower surface for dividing layer 6, and PD array is made of several photodiodes 4, fits in drive substrate 7
Lower surface.In order to enable the light after roofing lens to be preferably irradiated on PD array, herein by photoelectricity two in PD array
Pole pipe 4 is laid in the underface of self-focusing lens, forms photodiode 4 and self-focusing lens face structure；Photodiode 4
It can be equal with the quantity of self-focusing lens or differs.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through by
It is exposed on PD array after 2 optically focused of light collecting layer that self-focusing lens is constituted.
Embodiment six
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in Figure 8 comprising touched panel glass 1, light collecting layer
2, OLED device 3, the PD array being made of several photodiodes 4, hole array, divide layer 6 and drive substrate 7；Wherein optically focused
Layer 2 is arranged to make up by several self-focusing lens, and light collecting layer 2, which can be laid in, to be divided in version 6, but because light propagation have one section away from
From causing lighting effect not good enough, therefore light collecting layer 2 is fitted in the lower surface of touched panel glass 1 by the present embodiment.
Hole array is made of several independent via holes 5, is passed through convenient for optical path, and can limit optical path, it is ensured that light
The accuracy on road；Hole array is laid in drive substrate 7, and hole array rule or irregular can be laid in drive substrate 7；
The present embodiment directly opens up several via holes 5 in drive substrate 7 herein and constitutes hole array.
OLED device 3, which is laid in, to be divided on layer 6, and is shifted to install with self-focusing lens；Drive substrate 7, which fits in, divides layer
6 lower surface, PD array fit in the lower surface of drive substrate 7.In order to enable optical path to be preferably irradiated on PD array, from
Condenser lens, via hole 5 and photodiode 4 are located at same perpendicular；4 three of self-focusing lens, via hole 5 and photodiode
Quantity it is equal or different.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through by
Optical path limitation is carried out through hole array again after 2 optically focused of light collecting layer that self-focusing lens is constituted to expose on PD array.
Embodiment seven
The structure of full frame fingerprint recognition screen in the embodiment as shown in fig. 9, it includes touched panel glass 1, light collecting layer 2,
OLED device 3, divides layer 6 and drive substrate 7 at PD array；Wherein light collecting layer 2 is arranged to make up by several self-focusing lens, optically focused
Layer 2, which can be laid in, to be divided in version 6, but because light propagation has a distance, causes lighting effect not good enough, therefore the present embodiment will gather
Photosphere 2 fits in the lower surface of touched panel glass 1.OLED device 3, which is laid in, to be divided on layer 6, and is set with self-focusing lens dislocation
It sets；PD array is made of several photodiodes 4, is fitted in and is divided between layer 6 and drive substrate 7.In order to make through roofing lens
Light afterwards can be preferably irradiated on PD array, and photodiode 4 in PD array is being laid in self-focusing lens just herein
Lower section forms photodiode 4 and self-focusing lens face structure；The quantity of photodiode 4 and self-focusing lens can phase
Deng can not also wait.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through by
It is exposed on PD array after 2 optically focused of light collecting layer that self-focusing lens is constituted.
Embodiment eight
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in Figure 10 comprising touched panel glass 1, light collecting layer
2, OLED device 3, the PD array being made of several photodiodes 4, hole array, divide layer 6 and drive substrate 7；Wherein optically focused
Layer 2 is arranged to make up by several self-focusing lens, and light collecting layer 2, which can be laid in, to be divided in version 6, but because light propagation have one section away from
From causing lighting effect not good enough, therefore light collecting layer 2 is fitted in the lower surface of touched panel glass 1 by the present embodiment.
Hole array is made of several independent via holes 5, is passed through convenient for optical path, and can limit optical path, it is ensured that light
The accuracy on road；Hole array, which is laid in, to be divided in layer 6, hole array can rule or irregular be laid in divide in layer 6；This reality
It applies example and directly opens up several composition of via holes 5 hole arrays on dividing layer 6 herein.
OLED device 3, which is laid in, to be divided on layer 6, and is shifted to install with self-focusing lens；PD array, which fits in, divides 6 He of layer
Between drive substrate 7.In order to enable optical path to be preferably irradiated on PD array, self-focusing lens, via hole 5 and photodiode
4 are located at same perpendicular；The quantity of 4 three of self-focusing lens, via hole 5 and photodiode is equal or different.
When OLED device 3 issue light penetrate after touched panel glass 1 is reflected by finger through touched panel glass 1 reception after through by
Optical path limitation is carried out through hole array again after 2 optically focused of light collecting layer that self-focusing lens is constituted to expose on PD array.
Embodiment nine
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in figure 11, the full frame fingerprint recognition in the present embodiment
The structure of screen is identical as the structure of embodiment five, and difference present in the two is: light collecting layer 2 is by several toroidal lens array structures
At.
Embodiment ten
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in figure 12, the full frame fingerprint recognition in the present embodiment
The structure of screen is identical as the structure of embodiment six, and difference present in the two is: light collecting layer 2 is by several toroidal lens array structures
At.
Embodiment 11
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in figure 13, the full frame fingerprint recognition in the present embodiment
The structure of screen is identical as the structure of embodiment seven, and difference present in the two is: light collecting layer 2 is by several toroidal lens array structures
At.
Embodiment 12
The structure of full frame fingerprint recognition screen provided in the embodiment is as shown in figure 14, the full frame fingerprint recognition in the present embodiment
The structure of screen and the structure of example IV are identical, and difference present in the two is: light collecting layer 2 is by several toroidal lens array structures
At.
Into example IV, from top to bottom, refractive index becomes larger documented graded index layer embodiment one；Using
Such structure fabrication is convenient, and preparation cost is low.
The documented touched panel glass 1 into embodiment 12 of the embodiment of the present invention one is Cover glass.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (9)
1. a kind of full frame fingerprint recognition screen, it is characterised in that: including touched panel glass, light collecting layer, OLED device and PD array；Institute
The light for stating OLED device sending penetrates after the touched panel glass is reflected by finger after touched panel glass reception through described
It is exposed to after light collecting layer optically focused on the PD array.
2. full frame fingerprint recognition screen according to claim 1, it is characterised in that: further include hole array, through the light collecting layer
Light after optically focused is exposed on the PD array by the hole array.
3. full frame fingerprint recognition screen according to claim 1 or 2, it is characterised in that: it further include dividing layer and drive substrate,
The layer of dividing fits between the OLED device and the drive substrate, the PD array fit in the drive substrate with
It is described to divide between layer or fit under the drive substrate；The light collecting layer is located under the touched panel glass or described divides
In layer.
4. full frame fingerprint recognition screen according to claim 2, it is characterised in that: it further include dividing layer and drive substrate, institute
It states and divides layer and fit between the OLED device and the drive substrate, the PD array fits in the drive substrate and institute
It states and divides between layer or fit under the drive substrate；The light collecting layer is located under the touched panel glass or described divides layer
In, the hole array is set to described divide on layer or in the drive substrate.
5. full frame fingerprint recognition screen according to claim 1 or 2 or 4, it is characterised in that: the light collecting layer is by lenticule battle array
Column are constituted.
6. full frame fingerprint recognition screen according to claim 3, it is characterised in that: the light collecting layer is by microlens array structure
At.
7. full frame fingerprint recognition screen according to claim 1 or 2 or 4, it is characterised in that: the light collecting layer is gradient index
Rate layer.
8. full frame fingerprint recognition screen according to claim 3, it is characterised in that: the light collecting layer is graded index layer.
9. a kind of fingerprint identification method, it is characterised in that: this method is used for touch screen fingerprint recognition, and the light that touch screen issues is handled
Digital reflex carries out optically focused after returning touch screen, and the illumination after optically focused is mapped on the PD array of touch screen and forms electric signal.
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| CN201811298095.4A CN109472236A (en) | 2018-11-02 | 2018-11-02 | A kind of full frame fingerprint recognition screen and fingerprint identification method |
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| CN201811298095.4A CN109472236A (en) | 2018-11-02 | 2018-11-02 | A kind of full frame fingerprint recognition screen and fingerprint identification method |
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| US11322558B2 (en) | 2019-04-11 | 2022-05-03 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display panel and electronic device |
| CN110429205A (en) * | 2019-07-31 | 2019-11-08 | 武汉华星光电半导体显示技术有限公司 | A kind of display panel and display device |
| US11335742B2 (en) | 2019-07-31 | 2022-05-17 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display panel and display device having a circular arced encapsulation layer |
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| CN111095285B (en) * | 2019-08-23 | 2021-09-17 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| US11417143B2 (en) | 2019-08-23 | 2022-08-16 | Shenzhen GOODIX Technology Co., Ltd. | Fingerprint detection apparatus and method and electronic device |
| US11804509B2 (en) | 2019-10-18 | 2023-10-31 | Shenzhen GOODIX Technology Co., Ltd. | Fingerprint detection apparatus and electronic device |
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Application publication date: 20190315 |