CN110348432A - Optical recognition module - Google Patents
Optical recognition module Download PDFInfo
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- CN110348432A CN110348432A CN201810767443.1A CN201810767443A CN110348432A CN 110348432 A CN110348432 A CN 110348432A CN 201810767443 A CN201810767443 A CN 201810767443A CN 110348432 A CN110348432 A CN 110348432A
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- polaroid
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- optical recognition
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- 230000003287 optical effect Effects 0.000 title claims abstract description 83
- 230000010287 polarization Effects 0.000 claims description 28
- 230000000149 penetrating effect Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 9
- 230000013011 mating Effects 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 230000003667 anti-reflective effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 238000000151 deposition Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/071—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate a negative voltage output from a positive voltage source
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Theoretical Computer Science (AREA)
- Vascular Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Dc-Dc Converters (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The present invention provides a kind of optical recognition module comprising cover board, sensor, display panel, the first polaroid and the second polaroid.Display panel is arranged between cover board and sensor.First polaroid is arranged between cover board and display panel.First polaroid is circular polarizing disk or linear polarizer.Second polaroid is arranged between display panel and sensor.Second polaroid is circular polarizing disk or linear polarizer.
Description
Technical field
The present invention relates to a kind of optical module more particularly to a kind of optical recognition modules of recognizable biological characteristic.
Background technique
With flourishing for technology of Internet of things, the application of biological identification technology and demand therefore expansion rapidly.City at present
Common biological identification technology mainly identifies fingerprint, palmmprint, vein point in the way of optics, capacitor or ultrasonic wave etc. on face
The biological characteristics such as cloth, iris, retina or face feature achieve the purpose that identification or certification whereby.Compared to capacitor
Or ultrasonic wave mode identifies the identification module of biological characteristic, identifies that the optical recognition module of biological characteristic passes through biography optically
Sensor receives the light beam reflected by determinand, to carry out the identification of biological characteristic, therefore has durability high and low-cost
Advantage.However, light beam in the way transmitted towards determinand probably due to interface reflection and in the case where being acted on without determinand
It is transferred to sensor, causes signal-to-noise ratio (Signal-to-noise ratio) low, influences recognition accuracy.In addition, external environment
Light may also enter optical recognition module and be transferred to sensor, cause optical interference (crosstalk).Therefore, how to be promoted
Signal-to-noise ratio becomes and one of wants to solve the problems, such as those skilled in the art.
Summary of the invention
The present invention provides a kind of optical recognition module, with good recognition accuracy.
A kind of optical recognition module of the invention includes that cover board, sensor, display panel, the first polaroid and second are inclined
Mating plate.Display panel is arranged between cover board and sensor.First polaroid is arranged between cover board and display panel.First partially
Mating plate is circular polarizing disk or linear polarizer.Second polaroid is arranged between display panel and sensor.Second polaroid is circle
Polarizing film or linear polarizer.
In one embodiment of this invention, display panel is organic light emitting display panel or micro-led display surface
Plate.
In one embodiment of this invention, the first polaroid and the second polaroid are all dextropolarization piece or are all left-handed
Polarizing film.
In one embodiment of this invention, the first polaroid includes the first linear polarizer and the first quarter-wave plate,
And first quarter-wave plate be arranged between the first linear polarizer and display panel.Second polaroid includes the second linear polarizer
And second quarter-wave plate, and the second quarter-wave plate is arranged between the second linear polarizer and display panel, or
Second linear polarizer is arranged between the second quarter-wave plate and display panel.
In one embodiment of this invention, the first polaroid and the second polaroid are all linear polarizer, and the first polarisation
Angle between the penetrating shaft of piece and the penetrating shaft of the second polaroid is fallen in the range of 0 degree to 45 degree.
In one embodiment of this invention, optical recognition module further includes bandpass filter.Bandpass filter is suitable for filtering
Infrared light, and bandpass filter setting is on a sensor.
In one embodiment of this invention, optical recognition module further includes bandpass filter.Bandpass filter is suitable for filtering
Some visible light, and bandpass filter is arranged between display panel and sensor.
In one embodiment of this invention, optical recognition module further includes collimator.Collimator setting display panel with
Between sensor.
In one embodiment of this invention, optical recognition module further includes quarter-wave plate.Quarter-wave plate setting
Between the second polaroid and collimator.
In one embodiment of this invention, optical recognition module further includes an at least anti-reflecting layer.An at least anti-reflective
Penetrate the wherein at least one that display panel, the first polaroid, the second polaroid, collimator and quarter-wave plate is arranged in layer
An at least surface on.
In one embodiment of this invention, optical recognition module further includes light source.Light source is arranged by sensor.
It, will be not using the first polaroid and the second polaroid in optical recognition module of the invention based on above-mentioned
It is reduced in the case where being acted on through determinand towards the luminous intensity of the light beam of sensor passes, to promote signal-to-noise ratio.Therefore, of the invention
Optical recognition module can have good recognition accuracy.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and it is detailed to cooperate attached drawing to make
Carefully it is described as follows.
Detailed description of the invention
Fig. 1 to Fig. 9 is the diagrammatic cross-section according to the optical recognition module of the first to the 9th embodiment of the invention respectively.
Description of symbols:
100,100A1,100A2,100B, 100C, 100D, 100E, 100F, 100G, 100H: optical recognition module；
110: cover board；
120: sensor；
130: display panel；
140, the 140A: the first polaroid；
142: the first linear polarizers；
144: the first quarter-wave plates；
150, the 150A: the second polaroid；
152: the second linear polarizers；
154: the second quarter-wave plates；
160: bandpass filter；
170: collimator；
180: quarter-wave plate；
190: anti-reflecting layer；
B: visible light；
BO, BR, BR2, BR3, B1, B2, B3: light beam；
LS: light source；
OBJ: determinand；
P1: the first polarization direction；
P2: the second polarization direction.
Specific embodiment
In the accompanying drawings, each attached drawing shows the logical of method used in particular exemplary embodiment, structure and/or material
Perseverance feature.However, the attached drawing is not limited to the structure or feature of the following example, and these attached drawings are not necessarily to be construed as
Define or limit the range or property covered by these example embodiments.For example, for the sake of clarity, each film layer, area
The relative thickness and position of domain and/or structure may zoom in or out.
Tend to indicate depositing for similar or identical elements or features using similar or identical component symbol in the drawings
?.Similar reference numbers in attached drawing indicate similar element and repeat it is omitted.
Optical recognition module cited by the following example is suitable for obtaining the biological characteristic of determinand.Determinand can be finger
Or palm.Accordingly, biological characteristic can be fingerprint, vein or palmmprint, and but not limited to this.
Fig. 1 to Fig. 9 is the diagrammatic cross-section according to the optical recognition module of the first to the 9th embodiment of the invention respectively.
Fig. 1 is please referred to, the optical recognition module 100 of first embodiment is inclined including cover board 110, sensor 120, display panel 130, first
Mating plate 140 and the second polaroid 150.
Cover board 110 is suitable for protecting the element being located under it.For example, cover board 110 can be through strengthening or without strengthening
Glass substrate, but not limited to this.
Sensor 120 is suitable for receiving the light beam reflected by determinand OBJ and (has the light beam of biological information, such as light
Beam BO).For example, sensor 120 may include charge coupled cell (Charge Coupled Device, CCD), it is complementary
Metal oxide semiconductor device (Complementary Metal-Oxide Semiconductor, CMOS) or other are appropriate
The optical sensing elements of type.
Display panel 130 is arranged between cover board 110 and sensor 120.Display panel 130 is adapted to provide for visible light B.?
In the present embodiment, visible light B provided by display panel 130 is other than for showing, it may also be used for living things feature recognition.It lifts
For example, display panel 130 is organic light emitting display panel or micro-led display panel, and but not limited to this.
First polaroid 140 is arranged between cover board 110 and display panel 130.Second polaroid 150 is arranged in display surface
Between plate 130 and sensor 120.In other words, the first polaroid 140 and the second polaroid 150 are located at display panel 130
Opposite sides.
First polaroid 140 can be circular polarizing disk or linear polarizer.Second polaroid 150 can be circular polarizing disk or linear polarization
Piece.In the present embodiment, the first polaroid 140 and the second polaroid 150 are all circular polarizing disk, and the first polaroid 140 and
Two polaroids 150 can be all dextropolarization piece or be all left-hand polarization piece.
Specifically, the first polaroid 140 includes the first linear polarizer 142 and the first quarter-wave plate 144, and the
One quarter-wave plate 144 is arranged between the first linear polarizer 142 and display panel 130.Second polaroid 150 includes second
Linear polarizer 152 and the second quarter-wave plate 154, and the second quarter-wave plate 154 is arranged in the second linear polarizer 152
Between display panel 130.
A part (such as light beam B1) of visible light B provided by display panel 130 sequentially passes through the first quarter-wave plate
144, the first linear polarizer 142 and cover board 110 and be transferred to determinand OBJ.It (is had by the light beam that determinand OBJ reflects
The light beam BO of biological information) sequentially pass through cover board 110, the first linear polarizer 142, the first quarter-wave plate 144, display
Panel 130, the second quarter-wave plate 154 and the second linear polarizer 152 and be transferred to sensor 120.However, in addition to having
Except the light beam BO of biological information, sensor 120 is also possible to receive the light without determinand OBJ effect (as reflected)
Beam, such as light beam BR2, BR3.Specifically, a part (such as light beam B2, B3) of visible light B provided by display panel 130 is passing
Be handed in the way of determinand OBJ probably due to interface reflection and turn to, such as light beam B2 and light beam B3 are being transferred to the respectively
It is turned to when one linear polarizer 142 and the first quarter-wave plate 144 because interface is reflected, the light beam turned to by interface reflection
BR2, BR3 are then transmitted towards sensor 120, and are finally received by sensor 120.
The luminous intensity of light beam BR2, BR3 are very strong.Under the framework of not set second polaroid 150, sensor 120 may be connect
100% light beam BR2, BR3 are received, and influences recognition accuracy.Pass through setting for the first polaroid 140 the second polaroid 150 of collocation
Meter can will be reduced to about 50% by sensor 120 received light beam BR2, BR3, while will be received with life by sensor 120
The light beam BO of object characteristic information maintains about 100%.
Specifically, visible light B sheet provided by display panel 130 is as non-polarized light.That is, display panel
Visible light B provided by 130 has the first polarization direction P1 and the second polarization direction P2.It is inclined by First Line in visible light B
The part (referring to light beam B1) of vibration piece 142 can become linearly polarized light from non-polarized light, and the polarization direction of the linearly polarized light is (such as
First polarization direction P1) it is parallel to the penetrating shaft (not shown) of the first linear polarizer 142.Linearly polarized light is reflected by determinand OBJ
Rear polarizer direction is constant.Linearly polarized light is by becoming circularly polarized light (such as left-hand polarization light) after the first quarter-wave plate 144.
Circularly polarized light becomes linearly polarized light again after passing through the second quarter-wave plate 154, and the polarization direction of the linearly polarized light is parallel to
The penetrating shaft of second linear polarizer 152.Therefore linearly polarized light can pass through the second linear polarizer 152 and be received by sensor 120.
It in other words, is almost 100% by sensor by the light beam (having the light beam BO of biological information) that determinand OBJ reflects
120 receive.On the other hand, it is seen that not over the part (such as light beam B2, B3) of the first linear polarizer 142 because interface is anti-in light B
It penetrates and turns to, and light beam BR2, BR3 for turning to by interface reflection are still non-polarized light.Only have polarization direction flat in non-polarized light
Row can be inclined by the second line in the light beam (i.e. with the light beam of the first polarization direction P1) of the penetrating shaft of the second linear polarizer 152
Vibration piece 152 is simultaneously received by sensor 120.In other words, the light beam BR2 (or light beam BR3) about 50% turned to because interface is reflected
It is filtered out by the second linear polarizer 152 and about 50% by sensor 120 by the second linear polarizer 152 and being received.
It will be in the case where being acted on without determinand OBJ towards sensing using the first polaroid 140 and the second polaroid 150
The luminous intensity for the light beam (such as light beam BR2, BR3) that device 120 transmits reduces, to promote signal-to-noise ratio.Therefore, optical recognition module 100
There can be good recognition accuracy.
According to different demands, optical recognition module 100 optionally includes other elements or film layer.Following embodiment
It all can herewith improve, just be repeated no more under.
A referring to figure 2., the optical recognition module 100 of the optical recognition module 100A1 and Fig. 1 of second embodiment it is main
Difference is as described below.In optical recognition module 100A1, the setting of the second linear polarizer 152 the second quarter-wave plate 154 with
Between display panel 130.
B referring to figure 2., the following institute of the main difference of the optical recognition module 100A1 of optical recognition module 100A2 and Fig. 2A
It states.In optical recognition module 100A2, the second polaroid 150A is linear polarizer.Furthermore, the second polaroid 150A packet
It includes the second linear polarizer 152 but does not include the second quarter-wave plate 154 of Fig. 2A.Under the influence of some nonideal characteristics,
Light beam BO (Fig. 2 B is not shown, referring to Figure 1) with biological information can be elliptical polarization, therefore the second polaroid 150A
It is that linear polarizer can allow the light beam BO greater than 50% (such as 70%) to pass through.On the other hand, without determinand effect (as reflected)
Light beam (light beam BR2, BR3 as shown in figure 1) only have 50% can pass through.Therefore, signal-to-noise ratio can be promoted.
Referring to figure 3., the main difference of the optical recognition module 100 of the optical recognition module 100B and Fig. 1 of 3rd embodiment
It is different as described below.In optical recognition module 100B, the first polaroid 140A and the second polaroid 150A are all linear polarizer.
Furthermore, the first polaroid 140A include the first linear polarizer 142 but do not include Fig. 1 the first quarter-wave plate 144,
And second polaroid 150A include the second linear polarizer 152 but do not include Fig. 1 the second quarter-wave plate 154.In addition, first
Angle between the penetrating shaft of polaroid 140A and the penetrating shaft of the second polaroid 150A is fallen in the range of 0 degree to 45 degree.It changes
Sentence is talked about, and the angle between the penetrating shaft of the first polaroid 140A and the penetrating shaft of the second polaroid 150A can be greater than or equal to 0
It spends and is less than or equal to 45 degree.
Under this framework, the light beam that is reflected by determinand OBJ (having the light beam BO of biological information) is passing through the
It after one linear polarizer 142 and is being all the first polarization direction P1 by the polarization direction before the second linear polarizer 152.By to
The light beam light beam BO of biological information (have) for surveying object OBJ reflection is almost 100% to be received by sensor 120.It is another
Aspect, it is seen that turned to not over the part (such as light beam B2) of the first linear polarizer 142 because interface is reflected in light B, and because of boundary
The light beam BR2 that face is reflected and turned to still is non-polarized light.Only have polarization direction to be parallel to the second linear polarizer 152 in non-polarized light
The light beam light beam of the first polarization direction P1 (i.e. with) of penetrating shaft can be by the second linear polarizer 152 and by sensor
120 receive.Therefore, the light beam BR2 about 50% turned to because interface is reflected is filtered out by the second linear polarizer 152 and about 50% passes through
Second linear polarizer 152 is simultaneously received by sensor 120.
It will be in the case where being acted on without determinand OBJ towards biography using the first polaroid 140A and the second polaroid 150A
The luminous intensity for the light beam (such as light beam BR2) that sensor 120 transmits reduces, to promote signal-to-noise ratio.Therefore, optical recognition module 100B can
With good recognition accuracy.
Referring to figure 4., the main difference of the optical recognition module 100 of the optical recognition module 100C and Fig. 1 of fourth embodiment
It is different to be that optical recognition module 100C further comprises bandpass filter 160.Bandpass filter 160 is suitable for filtering external environmental light
Caused optical interference, and bandpass filter 160 penetrate frequency spectrum can be according to the wave band for living things feature recognition depending on.It lifts
For example, if carrying out living things feature recognition by visible light, bandpass filter 160 can be filtered for the infrared cutoff of filtering infrared light
Wave device (IR cut filter), and bandpass filter 160 may be provided at any position on sensor 120.As shown in figure 4, band
Bandpass filter 160 may be provided between cover board 110 and the first polaroid 140.However, bandpass filter 160 may also be arranged on lid
On plate 110, bandpass filter 160 may also be arranged between the first polaroid 140 and display panel 130, display panel 130 and
Between two polaroids 150 or between the second polaroid 150 and sensor 120.On the other hand, if being carried out by only some visible light
Living things feature recognition (i.e. from 400nm to 700nm in selected part wave band carry out living things feature recognition), then bandpass filter 160
It can be the filter of filtration fraction visible light (i.e. filtering 400nm is not used in the wave band of living things feature recognition into 700nm), and band
Bandpass filter 160 may be provided between display panel 130 and sensor 120, such as be arranged in display panel 130 and the second polarisation
Between piece 150 or between the second polaroid 150 and sensor 120.
Referring to figure 5., the main difference of the optical recognition module 100B of the optical recognition module 100D and Fig. 3 of the 5th embodiment
It is different to be that optical recognition module 100D further comprises bandpass filter 160.Before the associated description of bandpass filter 160 please refers to
It states, is repeated no more in this.
Please refer to Fig. 6, the main difference of the optical recognition module 100C of the optical recognition module 100E and Fig. 4 of sixth embodiment
It is different to be that optical recognition module 100E further comprises collimator 170.Collimator 170 is arranged in display panel 130 and sensor
Between 120, and the beam collimation that collimator 170 is suitable for be reflected and being transmitted towards sensor 120 by determinand (being not shown in Fig. 6)
Change.Collimator 170 can use any of light collimating element.For example, collimator 170 may include fiber array, tool
There are the transparent substrates etc. that the light shield layer with opening is formed on the shading element or surface of through-hole.
It should be noted that the optics of the optical recognition module 100 of Fig. 1, the optical recognition module 100A1 of Fig. 2A, Fig. 2 B are known
The optical recognition module 100D of the optical recognition module 100B and Fig. 5 of other module 100A2, Fig. 3 can also be on demand and further
Including collimator 170.
Please refer to Fig. 7, the main difference of the optical recognition module 100E of the optical recognition module 100F and Fig. 6 of the 7th embodiment
It is different to be that optical recognition module 100F further comprises quarter-wave plate 180, and the setting of quarter-wave plate 180 is inclined second
Between mating plate 150 and collimator 170.Quarter-wave plate 180 is suitable for filtering between the second polaroid 150 and collimator 170
The light beam (such as light beam BR) turned to by interface reflection, and help avoid the eye that stray light (such as light beam BR) is transferred to user
In.
Furthermore, the light beam light beam BO of biological information (have) reflected by determinand OBJ is towards sensing
Interface reflection may occur during transmitting between the second polaroid 150 and collimator 170 for device 120.Setting four/
Under the framework of one wave plate 180, light beam BO is by becoming line from circularly polarized light (such as left-hand polarization light) after the second linear polarizer 152
Polarised light (has the first polarization direction P1；It is not shown), linearly polarized light later can be from linearly polarized light by quarter-wave plate 180
Become circularly polarized light (such as left-hand polarization light) again.Circularly polarized light (such as left-hand polarization light) is collimated device 170 and reflects rear steering (example
Such as become right-handed polarized light from left-hand polarization light).The circularly polarized light (such as right-handed polarized light) being diverted passes through quarter-wave plate
It will become linearly polarized light after 180 (there is the second polarization direction P2).Since the second polarization direction P2 is perpendicular to the second linear polarization
The penetrating shaft of piece 152, therefore linearly polarized light can be filtered out by the second linear polarizer 152.
It should be noted that the optics of the optical recognition module 100 of Fig. 1, the optical recognition module 100A1 of Fig. 2A, Fig. 2 B are known
The optical recognition module 100D of the optical recognition module 100B and Fig. 5 of other module 100A2, Fig. 3 can also be on demand and further
At least one of them including collimator 170 and quarter-wave plate 180.
Please refer to Fig. 8, the main difference of the optical recognition module 100F of the optical recognition module 100G and Fig. 7 of the 8th embodiment
It is different to be that optical recognition module 100G further comprises an at least anti-reflecting layer 190, to reduce interface reflection.As shown in figure 8, light
Learning identification module 100G may include an anti-reflecting layer 190, and anti-reflecting layer 190 may be provided at collimator 170 towards four/
On the surface of one wave plate 180, but not limited to this.Anti-reflecting layer 190 may also be arranged on 170 facing sensing device 120 of collimator
On surface.Alternatively, anti-reflecting layer 190 may be provided at display panel 130, the first polaroid 140, the second polaroid 150 and four
On the surface of one of them of/mono- wave plate 180.Furthermore optical recognition module 100F may include multiple anti-reflecting layers 190, and
The multiple anti-reflecting layer 190 may be provided at display panel 130, the first polaroid 140, the second polaroid 150, collimator 170
And on multiple surfaces in quarter-wave plate 180.
It should be noted that the optics of the optical recognition module 100 of Fig. 1, the optical recognition module 100A1 of Fig. 2A, Fig. 2 B are known
The optical recognition module 100D of the optical recognition module 100B and Fig. 5 of other module 100A2, Fig. 3 can also be on demand and further
At least one of them including collimator 170, quarter-wave plate 180 and an at least anti-reflecting layer 190.
Please refer to Fig. 9, the main difference of the optical recognition module 100G of the optical recognition module 100H and Fig. 8 of the 9th embodiment
It is different to be that optical recognition module 100H further comprises light source LS.Light source LS is arranged by sensor 120, and light source is adapted to provide for
Light beam for living things feature recognition.In the case where being provided with the framework of light source LS and bandpass filter 160, bandpass filter 160
Penetrate the frequency spectrum that frequency spectrum corresponds to the issued light beam of light source LS.For example, light source LS is infrared light light source, and bandpass filter
160 be infrared cutoff filter, and but not limited to this.
It should be noted that the optical recognition module of foregoing embodiments can also further comprise light source LS on demand.
In conclusion in optical recognition module of the invention, it will be not using the first polaroid and the second polaroid
It is reduced in the case where being acted on through determinand towards the luminous intensity of the light beam of sensor passes, to promote signal-to-noise ratio.Therefore, of the invention
Optical recognition module can have good recognition accuracy.In one embodiment, may further be provided bandpass filter and/or
Collimator improves optical interference.In another embodiment, quarter-wave plate and/or at least an anti-reflective may further be provided
Layer is penetrated to reduce interface reflection.In another embodiment, light source may further be provided.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (11)
1. a kind of optical recognition module characterized by comprising
Cover board；
Sensor；
Display panel is arranged between the cover board and the sensor；
First polaroid is arranged between the cover board and the display panel, wherein first polaroid is circular polarizing disk
Or linear polarizer；And
Second polaroid is arranged between the display panel and the sensor, wherein second polaroid is circular polarization
Piece or linear polarizer.
2. optical recognition module according to claim 1, which is characterized in that the display panel is organic light emitting display face
Plate or micro-led display panel.
3. optical recognition module according to claim 1, which is characterized in that first polaroid and described second is partially
Mating plate is all dextropolarization piece or is all left-hand polarization piece.
4. optical recognition module according to claim 3, which is characterized in that first polaroid includes the first linear polarization
Piece and the first quarter-wave plate, first quarter-wave plate are arranged in first linear polarizer and the display surface
Between plate, second polaroid includes the second linear polarizer and the second quarter-wave plate, and second a quarter
Wave plate is arranged between second linear polarizer and the display panel or second linear polarizer setting is described the
Between two quarter-wave plates and the display panel.
5. optical recognition module according to claim 1, which is characterized in that first polaroid and described second is partially
Mating plate is all linear polarizer, and the angle between the penetrating shaft of first polaroid and the penetrating shaft of second polaroid is fallen
In the range of 0 degree to 45 degree.
6. optical recognition module according to claim 1, which is characterized in that further include:
Bandpass filter is suitable for filtering infrared light, and the bandpass filter is arranged on the sensor.
7. optical recognition module according to claim 1, which is characterized in that further include:
Bandpass filter is suitable for filtration fraction visible light, and the bandpass filter is arranged in the display panel and the biography
Between sensor.
8. optical recognition module according to claim 1, which is characterized in that further include:
Collimator is arranged between the display panel and the sensor.
9. optical recognition module according to claim 8, which is characterized in that further include:
Quarter-wave plate is arranged between second polaroid and the collimator.
10. optical recognition module according to claim 9, which is characterized in that further include:
An at least anti-reflecting layer is arranged in the display panel, first polaroid, second polaroid, the collimation
On an at least surface for the wherein at least one of device and the quarter-wave plate.
11. optical recognition module according to claim 1, which is characterized in that further include:
Light source is arranged by the sensor.
Applications Claiming Priority (2)
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|---|---|---|---|
| US201862651205P | 2018-04-01 | 2018-04-01 | |
| US62/651,205 | 2018-04-01 |
Publications (1)
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| CN110348432A true CN110348432A (en) | 2019-10-18 |
Family
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| CN201810767443.1A Withdrawn CN110348432A (en) | 2018-04-01 | 2018-07-13 | Optical recognition module |
| CN201810889125.2A Active CN110350778B (en) | 2018-04-01 | 2018-08-07 | Negative voltage generator and negative voltage detector thereof |
| CN201811124339.7A Pending CN110345864A (en) | 2018-04-01 | 2018-09-26 | Three-dimensional sensing module |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821107808.XU Expired - Fee Related CN208477552U (en) | 2018-04-01 | 2018-07-13 | Optical recognition module |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810889125.2A Active CN110350778B (en) | 2018-04-01 | 2018-08-07 | Negative voltage generator and negative voltage detector thereof |
| CN201811124339.7A Pending CN110345864A (en) | 2018-04-01 | 2018-09-26 | Three-dimensional sensing module |
Country Status (2)
| Country | Link |
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| CN (4) | CN208477552U (en) |
| TW (4) | TW201942604A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI741206B (en) | 2021-10-01 |
| TWI693373B (en) | 2020-05-11 |
| CN208477552U (en) | 2019-02-05 |
| TW201942604A (en) | 2019-11-01 |
| CN110345864A (en) | 2019-10-18 |
| CN110350778A (en) | 2019-10-18 |
| CN110350778B (en) | 2020-08-11 |
| TW201945881A (en) | 2019-12-01 |
| TWI695247B (en) | 2020-06-01 |
| TW201942541A (en) | 2019-11-01 |
| TW201942611A (en) | 2019-11-01 |
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