CN108694368A - Image sensor apparatus and method for sensing - Google Patents
Image sensor apparatus and method for sensing Download PDFInfo
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- CN108694368A CN108694368A CN201711294810.2A CN201711294810A CN108694368A CN 108694368 A CN108694368 A CN 108694368A CN 201711294810 A CN201711294810 A CN 201711294810A CN 108694368 A CN108694368 A CN 108694368A
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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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Abstract
The present invention provides a kind of Image sensor apparatus, the Image sensor apparatus includes a sensing module, and the sensing module includes multiple sensing units, wherein each sensing unit is used for generating one first sensing signal and one second sensing signal;An and at least control unit, it is respectively coupled to an at least sensing unit, for being exposed to the sensing unit according to one first time for exposure, to generate first sensing signal, further according to first sensing signal, it determines one second time for exposure for corresponding to an at least sensing unit, and the sensing unit is exposed with second time for exposure, to generate second sensing signal;Wherein, first sensing signal with second sensing signal is generated in different time.Image sensor apparatus provided by the invention promotes the clarity of image output using the time for exposure of adjustment sensing unit.
Description
[Technical field]
The present invention relates to a kind of Image sensor apparatus and method for sensing, and sensing unit is adjusted more particularly to a kind of utilize
Time for exposure length, to promote the Image sensor apparatus and method for sensing of image definition.
[Background technology]
With advances in technology with development, Image sensor apparatus technology has been widely used in various electronic equipments, example
Such as, digital camera, video camera and optical fingerprint identification etc..Wherein, optical fingerprint identification system is widely used, and
In the prior art, the time for exposure of all sensing units is identical.However, due to the image sensing dress of optical fingerprint identification
The optical field distribution intensity for each sensing unit position set is different, therefore the luminous intensity sensed can also differ, and lead
The problem of causing sensed image to have brightness irregularities influences the quality of sensing image, and then increases subsequent image processing
Degree of difficulty, and reduce the correct discrimination power of identification of fingerprint.In this case, how to provide a kind of for optical fingerprint identification
Image sensor apparatus, occur to avoid said circumstances, also just become one of the target made great efforts of industry.
[Invention content]
Therefore, the main object of the present invention be to provide a kind of Image sensor apparatus for optical fingerprint identification and
Method for sensing to promote the quality of sensing image, and then increases identification of fingerprint using the time for exposure length of adjustment sensing unit
Accuracy.
The present invention provides a kind of Image sensor apparatus, the Image sensor apparatus includes a sensing module, the sensing
Module includes multiple sensing units, wherein each sensing unit is used for generating one first sensing signal and one second sensing signal;
And an at least control unit, it is respectively coupled to an at least sensing unit, is used for according to one first time for exposure to the sensing
Unit is exposed, and to generate first sensing signal, further according to first sensing signal, is determined corresponding to described at least
One second time for exposure of one sensing unit, and the sensing unit is exposed with second time for exposure, to generate
Second sensing signal;Wherein, first sensing signal with second sensing signal is generated in different time.
The present invention separately provides a kind of method for sensing, is used for a sensing unit of an Image sensor apparatus, which is characterized in that
Include being exposed to the sensing unit corresponding to it according to one first time for exposure by a control unit, to generate one
First sensing signal;By described control unit according to first sensing signal, one corresponding to the sensing unit is determined
Second time for exposure;The sensing unit is exposed with second time for exposure by described control unit, to generate
One second sensing signal;And second sensing signal a to signal processing circuit is exported by a controlling bus, to generate
One image.
[Description of the drawings]
Figure 1A is the schematic diagram of a fingerprint identification system of the embodiment of the present invention.
Figure 1B is the schematic diagram of another fingerprint identification system of the embodiment of the present invention.
Fig. 2 is the schematic diagram of an Image sensor apparatus of the embodiment of the present invention.
Fig. 3 is the schematic diagram of another Image sensor apparatus of the embodiment of the present invention.
Fig. 4 is a time for exposure schematic diagram of the different sensing units of the embodiment of the present invention.
Fig. 5 is the distribution of light intensity schematic diagram that a Gaussian Profile is presented.
Fig. 6 is the distribution of light intensity schematic diagram that a non-uniform Distribution is presented.
Fig. 7 is the schematic diagram of a sensing flow of the embodiment of the present invention.
Wherein, the reference numerals are as follows:
[Specific implementation mode]
A is please referred to Fig.1, Figure 1A is the schematic diagram of a fingerprint identification system 1 of the embodiment of the present invention.Fingerprint identification system 1
A fingerprint surface is sensed using an Image sensor apparatus 10 to recognize for subsequent fingerprint.Image sensor apparatus 10 includes a sensing
Module 102, a light source L and a panel P.For example, in one embodiment, when the fingerprint of a user is positioned over identification of fingerprint
When in system 1 and triggering fingerprint identification system 1, a light emitting diode (Light-Emitting Diode, LED) light source can emit
Light directive fingerprint surface, and light can reflex to sensing module 102 from fingerprint surface.Then, sensing module 102 can receive simultaneously
Reflected light is sensed, to generate a sensing signal.Alternatively, in another embodiment, please referring to Fig.1 B, Figure 1B is this hair
The schematic diagram of another fingerprint identification system 2 of bright embodiment.The places different from the fingerprint identification system 1 of Figure 1A are, panel P
For an Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display, and OLED display conduct
Light source can emit light directive fingerprint surface, and light can reflex to sensing module 102 from fingerprint surface.Then, sensing module 102
Reflected light can be received and sense, to generate a sensing signal.
Specifically, with continued reference to FIG. 2, Fig. 2 is the schematic diagram of the Image sensor apparatus 10 of the embodiment of the present invention.Image
Sensing device further 10 is used for generating and handling sensing signal, to generate a sensing image.Image sensor apparatus 10 additionally comprises a control
Bus 104 and a signal processing circuit 106.Sensing module 102 can be realized by a picture element matrix, for example, pin hole (pin
Hole) the pin hole picture element matrix of framework.In this embodiment, sensing module 102 is by multiple sensing units 108 and multiple controls
Unit 110 is formed.For example, each sensing unit 108 is a pixel in picture element matrix, wherein each sensing unit
108 are used for generating one first sensing signal and one second sensing signal, and each control unit 110 corresponds respectively to a sensing
Unit 108.When proceeding by identification of fingerprint, each control unit 110 can be right respectively according to one first time for exposure of acquiescence
Sensing unit 108 corresponding to it is exposed, to generate the first sensing signal.Then, control unit 110 can be single according to sensing
The first sensing signal that member 108 generates controls one second time for exposure of the sensing unit 108 corresponding to it, and according to this to sensing
Unit 108 is exposed, to generate the second sensing signal.Controlling bus 104 is coupled to sensing module 102, for receiving sense
Survey the second sensing signal caused by module 102.Signal processing circuit 106 is coupled to controlling bus 104, carrys out automatic control for receiving
Second sensing signal of bus 104 processed, to generate a fingermark image according to this.Thus, which Image sensor apparatus 10 utilizes control
Unit 110 controls the time for exposure of the sensing unit 108 corresponding to it, to promote the sensed quality of image, and then provides
Clearer image.
Above-mentioned example only schematically illustrate the present invention Image sensor apparatus be using control unit 110 control its institute it is right
The time for exposure for the sensing unit 108 answered is exposed each sensing unit 108 with different time for exposure length, rather than
All sensing units 108 are exposed with identical time for exposure length, and then improve the quality of sensing signal, and are promoted
Image definition.It is noted that those skilled in the art can fill according to different system demand come appropriately designed image sensing
It sets, for example, control unit 110 can also control the exposure of multiple sensing units 108 simultaneously in addition to can control single sensing unit 108
Between light time, alternatively, control unit 110 can be realized in a manner of software set or be realized with devices such as hardware circuit controllers, into
And promote the clarity of sensing image.
With continued reference to FIG. 3, Fig. 3 is the schematic diagram of another Image sensor apparatus 30 of the embodiment of the present invention.It is different from Fig. 2
Place be that each control unit 110 of the Image sensor apparatus 30 of Fig. 3 corresponds to four sensing units 108, in other words
It says, each control unit 110 can simultaneously or separately control the second time for exposure of four sensing units 108.Specifically, each
The first sensing signal and the second sensing signal of sensing unit 108 are generated in different time, and control unit 110 is first basis
One light sensation measured value of the first sensing signal, determines the second time for exposure of the sensing unit 108 corresponding to it.In this embodiment
In, control unit 110 can be a switch, for being turned on and off the sensing unit 108 corresponding to it, to adjust sensing unit
108 time for exposure length, but not limited to this.That is, when each control unit 110 is connected and corresponding to a sensing
When unit 108 (as shown in Figure 2), it can individually determine and adjust by each control unit 110 according to the first sensing signal
Second time for exposure of each sensing unit 108, or when each control unit 110 is to connect and correspond to multiple sensings
When unit 108 (as shown in Figure 3), can by control unit 110 according to the first sensing signal, while or individually adjust one or
Second time for exposure of multiple sensing units 108.Since the light sensation measured value of each sensing unit 108 differs, control
Second time for exposure of one or more sensing units 108 corresponding to unit 110 also differs.Thus, pass through control
Unit 110 controls the second time for exposure of sensing unit 108, and Image sensor apparatus 30 can control the of each sensing unit 108
Two time for exposure certainly reflected the distribution of light intensity distribution of sensing module 102, to generate clearer sensing image.
Specifically, control unit 110 is the light sensation measured value according to the first sensing signal, determines the sensing list corresponding to it
Second time for exposure of member 108.For example, when 108 position of sensing unit distribution of light intensity (optical intensity) compared with
When big (the light sensation measured value of the first sensing signal caused by sensing unit 108 is higher), then by control unit 110 in decision
After corresponding second time for exposure, it can in time open and close the sensing unit 108 corresponding to it to reduce sensing unit 108
The second time for exposure.On the contrary, when the distribution of light intensity of sensing unit 108 is smaller (light sensation measured value is relatively low), then pass through control
Unit 110 processed is in time opened after determining corresponding second time for exposure and closes the sensing unit 108 corresponding to it to increase
Add the second time for exposure of the sensing unit 108 corresponding to it.
Referring to FIG. 4, Fig. 4 is the time for exposure schematic diagram of the different sensing units 108 of the embodiment of the present invention.In Fig. 4,
Sensing unit 108_1,108_2,108_3 are respectively corresponding to time for exposure t1, t2, t3, that is to say, that sensing unit 108_1's
The incomplete phase of length of the time for exposure t3 of time for exposure t1, the time for exposure t2 of sensing unit 108_2 and sensing unit 108_3
Together.It is worth noting that, control unit 110 can be by controlling pixel clock (pixel clock), to control sensing unit
Its time for exposure is altered or modified in 108 time for exposure, or other control methods can also be used, to control or adjust sense
The time for exposure of unit 108 is surveyed, and it is without being limited thereto.Therefore, the distribution of light intensity sensed when sensing module 102 is as shown in Figure 5
For a Gaussian Profile (Gaussian distribution) or a non-uniform Distribution (Non-uniform distribution)
When, the present invention can utilize the control unit 110 of sensing module 102 to determine corresponding sensing unit according to the first sensing signal
108 the second time for exposure, and it is turned on and off one or more sensing units 108 corresponding to it according to this, it is every to control
Second time for exposure of one sensing unit 108 so that the light sensation measured value of the second sensing signal caused by all sensing units 108
Distribution can show the uniform light field distribution such as Fig. 6.
Specifically, the exposal control method of above-mentioned Image sensor apparatus 30 can be summarized as a sensing flow 70.It please refers to
Fig. 7, Fig. 7 are 70 schematic diagram of sensing flow of the embodiment of the present invention.It includes that detailed step is as follows to sense flow 70:
Step 702:Start.
Step 704:Control unit 110 carries out the sensing unit 108 corresponding to it according to the first time for exposure of acquiescence
Exposure, to generate the first sensing signal.
Step 706:By control unit 110 according to the light sensation measured value of the first sensing signal, the sensing corresponding to it is determined
Second time for exposure of unit 108.
Step 708:Sensing unit 108 is exposed with the second time for exposure of decision by control unit 110, with production
Raw second sensing signal.
Step 710:The second sensing signal is transmitted to signal processing circuit 106, to generate image by controlling bus 104.
Step 712:Terminate.
According to sensing flow 70, Image sensor apparatus 30 of the invention is in time turned on and off by control unit 110
Sensing unit 108 corresponding to it, to adjust its second time for exposure.In one embodiment, for each sensing unit 108,
According to step 704, control unit 110 is exposed the sensing unit 108 corresponding to it according to the first time for exposure of acquiescence,
To generate the first sensing signal.Then, according to step 706, by control unit 110 according to the light sensing of the first sensing signal
Value determines the second time for exposure of sensing unit 108.For example, when the optical field distribution of the first sensing signal is height as shown in Figure 5
When this distribution or distribution heterogeneous, control unit 110 can be according to light sensation measured value (its reflection sensing unit of the first sensing signal
The optical field distribution of 108 positions), determine the second time for exposure of sensing unit 108, and open and closed corresponding to it according to this
Sensing unit 108, to adjust the second time for exposure of sensing unit 108.In step 708, by control unit 110 to determine
The second fixed time for exposure is exposed sensing unit 108, to generate the second sensing signal.Finally, in step 720, lead to
Second sensing signal of the controlling bus 104 by generation is crossed, signal processing circuit 106 is sent to, to generate image.It is noticeable
It is, it is above-mentioned to be described only for single sensing unit 108.In another embodiment, when control unit 110 is connected to simultaneously simultaneously
When controlling multiple sensing units 108, you can according to the second time for exposure of each sensing unit 108, be in time turned on and off
One or more sensing units 108, with the time for exposure length of adjustment one or more sensing unit 108, it will not be described here.
In the above-described embodiments, the sensing twice that sensing unit 108 is carried out generates the first sensing signal and second respectively
Sensing signal.Specifically, it is for judging sensing module that sensing unit 108 opens generated first sensing signal for the first time
The distribution of 102 distribution of light intensity is to adjust and set the second time for exposure.And second of sensing unit 108 is when opening, then be with
The second time for exposure determined when opening for the first time is exposed, to generate the second sensing signal.Second sensing signal can quilt
It is sent to signal processing circuit 106, to generate a fingermark image.Since the distribution of distribution of light intensity is to change over time, in
Before carrying out identification of fingerprint every time, Image sensor apparatus all needs to detect the distribution of distribution of light intensity again, and passes through control unit 110
Decide whether to adjust the second time for exposure of each sensing unit 108.That is, whenever carrying out identification of fingerprint, image sense
All sensing units 108 can be opened to sense the distribution (example of distribution of light intensity according to the first time for exposure of acquiescence by surveying device 30
Such as, all sensing units 108 are opened to be sensed according to 10 milliseconds of preset first time for exposure (ms)).Then, control is single
Member 110 judges that 108 institute of each sensing unit is in place according to the light sensation measured value of the first sensing signal caused by sensing unit 108
The distribution of light intensity set, to determine the second time for exposure of each sensing unit 108.Significantly, since each sensing is single
Member 108 at a distance from light source L or panel P with relative position and differ, therefore, the light that each sensing unit 108 is sensed
Intensity and the light sensation measured value of generated first sensing signal also can be different.Then, control unit 110 is in each sensing of decision
After second time for exposure of unit 108, each sensing unit 108 can be exposed with the second time for exposure determined, with production
Raw second sensing signal.Finally, the second sensing signal produced by sensing unit 108 is sent to by signal by controlling bus 104
Processing circuit 106, to generate fingermark image.
In addition to this, in order to reduce the spatial design or complexity of hardware, each of Image sensor apparatus can be controlled
Unit 110 corresponds to and is connected to multiple sensing units 108, simultaneously or separately to control multiple or a sensing unit 108 exposure
Between light time.Thus, be connected to multiple sensing units 108 by each control unit 110, Image sensor apparatus of the present invention can
According to the optical field distribution of a specific region or corresponding to the light sensation measured value of sensing unit 108, determine that one or more sensings are single
The time for exposure of member 108, alternatively, according to system and the demand of hardware, when adjusting the exposure of one or more sensing units 108
Between, and then effectively promote the quality and clarity of sensing image.
It is noted that previous embodiment is to illustrate the spirit of the present invention, those skilled in the art works as can be according to this
Modification appropriate is done, and it is without being limited thereto.For example, the control unit of Image sensor apparatus can not only be controlled by hardware circuit
Device is realized, can also be realized by the software set of programmable.The control unit of Image sensor apparatus not only can be to one or more
A sensing unit is exposed the control of time, can also be combined to multiple or specific region sensing unit or quantity is exposed
Time control, to meet the demand of user or manufacturer.Previous embodiment can all make change appropriate, all belong to the model of the present invention
Farmland.
In conclusion the present invention provides a kind of Image sensor apparatus and its method for sensing for fingerprint identification system, especially
It is a kind of optical fingerprint sensor (optical fingerprint sensor) for optical fingerprint identification system,
The time for exposure that sensing unit is controlled using control unit is unevenly distributed with to improve and reduce distribution of light intensity and is made to sensing image
At influence increase the accuracy of identification of fingerprint to provide clearer fingermark image.
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 present invention can have various changes and variation.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of Image sensor apparatus, the Image sensor apparatus include:
One sensing module, the sensing module include:
Multiple sensing units, wherein each sensing unit is used for generating one first sensing signal and one second sensing signal;And
An at least control unit corresponds respectively to an at least sensing unit, is used for according to one first time for exposure to the sensing
Unit is exposed, and to generate first sensing signal, further according to first sensing signal, is determined described corresponding to it
One second time for exposure of an at least sensing unit, and the sensing unit is exposed with second time for exposure, with
Generate second sensing signal;
Wherein, first sensing signal with second sensing signal is generated in different time.
2. Image sensor apparatus as described in claim 1, which is characterized in that an at least control unit is by opening or closing
An at least sensing unit is closed, second time for exposure of at least sensing unit corresponding to it is adjusted.
3. Image sensor apparatus as described in claim 1, which is characterized in that an at least control unit is according to described first
Sensing signal judges an optical field distribution of the sensing unit position, and according to the light sensation corresponding to each sensing unit
Measured value determines second time for exposure of at least sensing unit corresponding to it.
4. Image sensor apparatus as claimed in claim 3, which is characterized in that the optical field distribution is a Gaussian Profile, one non-
One of in being uniformly distributed.
5. Image sensor apparatus as described in claim 1, which is characterized in that second exposure of each sensing unit
Time is not exactly the same.
6. Image sensor apparatus as described in claim 1, which is characterized in that further include:
One controlling bus is coupled to the sensing module, for receiving the second sensing letter caused by the sensing module
Number;And
One signal processing circuit is coupled to the controlling bus, is used for generating an image according to second sensing signal.
7. Image sensor apparatus as described in claim 1, which is characterized in that the sensing module is a pin hole matrix.
8. Image sensor apparatus as described in claim 1, which is characterized in that first time for exposure is preset.
9. a kind of method for sensing is applied to an Image sensor apparatus comprising multiple sensing units, which is characterized in that including:
The sensing unit corresponding to it is exposed according to one first time for exposure by a control unit,
To generate one first sensing signal;
By described control unit according to first sensing signal, when determining one second exposure corresponding to the sensing unit
Between;
The sensing unit is exposed with second time for exposure by described control unit, to generate one second sensing
Signal;And
Second sensing signal a to signal processing circuit is transmitted by a controlling bus, to generate an image.
10. method for sensing as claimed in claim 9, which is characterized in that further include:
It is turned on and off the sensing unit by described control unit, adjustment is exposed corresponding to described the second of the sensing unit
Between light time.
11. method for sensing as claimed in claim 9, which is characterized in that described control unit is according to first sensing signal
Judge an optical field distribution of the sensing unit position, and according to the light sensation measured value corresponding to each sensing unit, certainly
Surely correspond to second time for exposure of the sensing unit.
12. method for sensing as claimed in claim 11, which is characterized in that the optical field distribution is that a Gaussian Profile or one are non-equal
One of even distribution.
13. method for sensing as claimed in claim 9, which is characterized in that first time for exposure is preset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/884,390 US10645302B2 (en) | 2017-03-30 | 2018-01-31 | Image sensing device having adjustable exposure periods and sensing method using the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762479269P | 2017-03-30 | 2017-03-30 | |
| US62/479,269 | 2017-03-30 |
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| CN108694368B CN108694368B (en) | 2022-01-25 |
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| Publication number | Publication date |
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| CN108694368B (en) | 2022-01-25 |
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