CN109696682A - Optical sensing module and terminal device - Google Patents
Optical sensing module and terminal device Download PDFInfo
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- CN109696682A CN109696682A CN201710995710.6A CN201710995710A CN109696682A CN 109696682 A CN109696682 A CN 109696682A CN 201710995710 A CN201710995710 A CN 201710995710A CN 109696682 A CN109696682 A CN 109696682A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 123
- 230000010287 polarization Effects 0.000 claims abstract description 145
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- 238000003379 elimination reaction Methods 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- 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
- G06V40/70—Multimodal biometrics, e.g. combining information from different biometric modalities
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The application provides a kind of optical sensing module and terminal device, the optical sensing module is located at the lower section of display module, the display module is from top to bottom configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer, which is from top to bottom configured in order: the second wave plate, the second polarizing film, light detector layer and light source layer；Wherein, the polarization direction of first polarizing film is vertical with the polarization direction of the second polarizing film, the fast axle of second wave plate is parallel with the fast axle of the first wave plate, first wave plate and the second wave plate are quarter-wave plate, or first polarizing film polarization direction it is parallel with the polarization direction of the second polarizing film, the fast axle of second wave plate is vertical with the fast axle of the first wave plate, and the first wave plate and the second wave plate are quarter-wave plate.When the optical sensing module of the application is placed on the lower section of display module, the reflected light of luminescent layer can be eliminated, to improve the ratio of effective detection light in total light that light detector layer receives.
Description
Technical field
This application involves technical field of optical detection, and set more particularly, to a kind of optical sensing module and terminal
It is standby.
Background technique
Fingerprint recognition is the important application and experience functions of current phone, and full frame fingerprint sensing is the following mobile fingerprint sensing
The development trend of device, target are to realize that arbitrary region completes fingerprint detection on mobile phone screen.
Fingerprint detection method under a kind of screen known mainly includes the detections sides such as ultrasound detection, capacitance detecting and optical detection
Case.Shield lower fingerprint detection method and mould group progress fingerprint detection is detected by optical finger print.Optical finger print detect mould group by light source and
Detector composition, light source and detector are placed in below screen.
Since there are various reflecting layer in screen, light that the light source below screen issues upwards reach screen it
Before, it has a large amount of light and is reflected by the reflecting layer, and received by the detector below screen, in this part reflection light not
Information (for example, finger print information) comprising object to be detected, to reduce effective inspection in total light that detector receives
Survey the ratio of light, that is, reduce the signal-to-noise ratio of detection information.
Accordingly, it is desirable to provide a kind of effective detection light ratio that can be improved in total light that detector receives
Method.
Summary of the invention
The application provides a kind of optical sensing module and terminal device, can support the reflected light for eliminating luminescent layer, thus
Improve the ratio of effective detection light in total light that light detector layer receives.
In a first aspect, providing a kind of optical sensing module, which is located at the lower section of display module, the display
Mould group is from top to bottom configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer, and the optical sensing module is by upper
It is configured in order under and: the second wave plate, the second polarizing film, light detector layer and light source layer；Wherein, the polarization side of first polarizing film
To vertical with the polarization direction of the second polarizing film, the fast axle of second wave plate is parallel with the fast axle of first wave plate, the first wave
Piece and second wave plate are the polarization direction of quarter-wave plate or first polarizing film and the polarization direction of the second polarizing film
In parallel, the fast axle of second wave plate is vertical with the fast axle of first wave plate, and first wave plate and second wave plate be four/
One wave plate.
By the way that the optical sensing module to be placed in the lower section of display module, and make the first wave plate in display module
Fast axle, the first polarizing film polarization direction and optical sensing module in the polarization direction of the second polarizing film, the second wave plate
There is determining corresponding relationship between fast axle, the light for enabling to light source to issue upwards reaches the luminescent layer in display module
And be filtered off after being reflected by luminescent layer, i.e., prevent the light after being reflected by luminescent layer is from reaching light detector layer, while making light
The light that source issues upwards is after reaching the object to be detected of the transparent panel upper surface in display module and being reflected by object to be detected
Light detector layer can be reached, and is received by light detector layer.
Optionally, object to be detected involved in the embodiment of the present application can be in fingerprint, palmmprint, face or other objects
Any one.
Optionally, being formed by acute angle between the polarization direction of first polarizing film and the fast axle of first wave plate is
45 degree, it is 45 degree that acute angle is formed by between the polarization direction of second polarizing film and the fast axle of second wave plate.
By making to be formed by acute angle between the polarization direction of first polarizing film and the fast axle of first wave plate
45
Degree, it is 45 that acute angle is formed by between the polarization direction of second polarizing film and the fast axle of second wave plate
Degree, so that after polarised light after passing through the first polarizing film passes through two blocks of parallel quarter-wave plates of fast axle again, the polarised light
Polarization direction be changed by the vertical polarization direction in the polarization direction after the first polarizing film, and make when by second
After polarised light after polarizing film passes through two blocks of parallel quarter-wave plates of fast axle again, the polarization direction of the polarised light be changed into
Pass through the vertical polarization direction in the polarization direction after the second polarizing film.
With reference to first aspect, in certain implementations of first aspect, which further includes compensation wave plate,
The compensation wave plate is configured at the upper surface of second wave plate, and the fast axle of the compensation wave plate and the fast axle of optical plastic are vertical, the light
Learn the lower surface that plastics are configured at the luminescent layer.
By increasing compensation wave plate in the optical sensing module, so that the material of the compensation wave plate and thickness and the optics
Plastics are identical, and it is vertical with the fast axle of optical plastic to make the fast axle of the compensation wave plate, to overcome the optical plastic to light beam
Polarization state influence, enable the polarised light of the second polarizing film of the arrival after being reflected by luminescent layer completely by the second polarizing film
It filters out.
With reference to first aspect, in certain implementations of first aspect, which is Organic Light Emitting Diode OLED
Layer.
Second aspect provides a kind of optical sensing module, which is located at the lower section of display module, the display
Mould group is from top to bottom configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer, and the optical sensing module is by upper
It is configured in order under and: the second wave plate, the second polarizing film, light source layer and light detector layer；Wherein, the polarization side of first polarizing film
To vertical with the polarization direction of the second polarizing film, the fast axle of second wave plate is parallel with the fast axle of first wave plate, the first wave
Piece and second wave plate are the polarization direction of quarter-wave plate or first polarizing film and the polarization direction of the second polarizing film
In parallel, the fast axle of second wave plate is vertical with the fast axle of first wave plate, and first wave plate and second wave plate be four/
One wave plate.
By by should optical sensing module be placed in the lower section of display module, and make the first wave in display module
The fast axle of piece, the first polarizing film polarization direction and optical sensing module in the polarization direction of the second polarizing film, the second wave plate
Fast axle between there is determining corresponding relationship, the light for enabling to light source to issue upwards reaches shining in display module
Layer is simultaneously filtered off after being reflected by luminescent layer, i.e., prevent the light after being reflected by luminescent layer makes simultaneously from reaching light detector layer
The light that light source issues upwards reaches the object to be detected of the transparent panel upper surface in display module and is being reflected by object to be detected
After can reach light detector layer, and received by light detector layer.
Optionally, object to be detected involved in the embodiment of the present application can be in fingerprint, palmmprint, face or other objects
Any one.
Optionally, being formed by acute angle between the polarization direction of first polarizing film and the fast axle of first wave plate is
45 degree, it is 45 degree that acute angle is formed by between the polarization direction of second polarizing film and the fast axle of second wave plate.
By making to be formed by acute angle between the polarization direction of first polarizing film and the fast axle of first wave plate
45 degree, it is 45 degree that acute angle is formed by between the polarization direction of second polarizing film and the fast axle of second wave plate, so that
After polarised light after passing through the first polarizing film passes through two blocks of parallel quarter-wave plates of fast axle again, the polarization side of the polarised light
To being changed by the vertical polarization direction in the polarization direction after the first polarizing film, and make after passing through the second polarizing film
Polarised light pass through two blocks of parallel quarter-wave plates of fast axle again after, the polarization direction of the polarised light be changed by second
The vertical polarization direction in polarization direction after polarizing film.
In conjunction with second aspect, in certain implementations of second aspect, which further includes compensation wave plate,
The compensation wave plate is configured at the upper surface of second wave plate, and the fast axle of the compensation wave plate and the fast axle of optical plastic are vertical, the light
Learn the lower surface that plastics are configured at the luminescent layer.
By increasing compensation wave plate in the optical sensing module, so that the material of the compensation wave plate and thickness and the optics
Plastics are identical, and it is vertical with the fast axle of optical plastic to make the fast axle of the compensation wave plate, to overcome the optical plastic to light beam
Polarization state influence, enable the polarised light of the second polarizing film of the arrival after being reflected by luminescent layer completely by the second polarizing film
It filters out.
In conjunction with second aspect, in certain implementations of second aspect, the optical sensing module further include: third polarization
Piece, the third polarizing film are configured between the light source layer and the light detector layer, the polarization direction of the third polarizing film and this second
The polarization direction of polarizing film is identical.
By configuring third polarizing film between light source layer and light detector layer, and make the polarization direction of the third polarizing film
It is identical as the polarization direction of second polarizing film, so that in the light that light source layer issues downwards after through third polarizing film
Decaying 50%, and can guarantee be received by light detector layer after being reflected by object to be detected by the polarised light of the second polarizing film.
In conjunction with second aspect, in certain implementations of second aspect, which is Organic Light Emitting Diode OLED
Layer.
The third aspect provides a kind of optical sensing module, the optical sensing module be from top to bottom configured in order light source layer,
Second polarizing film, light detector layer, the optical sensing module are located at the lower section of display module, which from top to bottom successively matches
It is equipped with transparent panel, the first polarizing film, the first wave plate and luminescent layer, wherein the light source layer is polarization state light active layer, and the light
The polarization direction for the polarised light that active layer issues is vertical with the polarization direction of the second polarizing film.
By the way that the optical sensing module to be placed in the lower section of display module, and the light that the light source layer is issued is inclined
Shake light, and the polarization direction of the polarised light is vertical with the polarization direction of the second polarizing film, so that the quilt that light source layer issues upwards
The polarization direction of polarised light after luminescent layer reflection is vertical with the polarization direction of the second polarizing film, so that after being reflected by luminescent layer
Polarised light before reaching light detector layer, in the polarised light that is filtered out by the second polarizing film, and light source layer is issued downwards
It before reaching light detector layer, is filtered out by the second polarizing film, and the polarised light that light source layer is issued upwards is by transparent panel
It can reach by light detector layer after the object to be detected reflection of upper surface, and be received by light detector layer.
Optionally, object to be detected involved in the embodiment of the present application can be in fingerprint, palmmprint, face or other objects
Any one.
Fourth aspect provides a kind of terminal device, which includes in above-mentioned first aspect and first aspect
Optical sensing module and display module in any one implementation, wherein the optical sensing module is located at display module
Lower section.
Optionally, which specifically can be the intelligent terminal comprising display screen, for example, the terminal device can
To be smart phone, tablet computer, wearable device, PC etc..
By configuration middle below the display module in the terminal device optical sensing module, so that after being reflected by luminescent layer
The light light that is filtered out completely before reaching light detector layer, while light source is issued upwards in reaching display module
Transparent panel upper surface object to be detected and light detector layer can be reached after object to be detected reflection, and connect by light detector layer
It receives.
5th aspect, provides a kind of terminal device, which includes in above-mentioned second aspect and second aspect
Optical sensing module and display module in any one implementation, wherein the optical sensing module is located at display module
Lower section.
Optionally, which specifically can be the intelligent terminal comprising display screen, for example, the terminal device can
To be smart phone, tablet computer, wearable device, PC etc..
By configuration middle below the display module in the terminal device optical sensing module, so that after being reflected by luminescent layer
The light light that is filtered out completely before reaching light detector layer, while light source is issued upwards in reaching display module
Transparent panel upper surface object to be detected and light detector layer can be reached after object to be detected reflection, and connect by light detector layer
It receives.
6th aspect, provides a kind of terminal device, which includes in the above-mentioned third aspect and the third aspect
Optical sensing module and display module in any one implementation, wherein the optical sensing module is located at display module
Lower section.
Optionally, which specifically can be the intelligent terminal comprising display screen, for example, the terminal device can
To be smart phone, tablet computer, wearable device, PC etc..
By configuration middle below the display module in the terminal device optical sensing module, so that after being reflected by luminescent layer
The light light that is filtered out completely before reaching light detector layer, while light source is issued upwards in reaching display module
Transparent panel upper surface object to be detected and light detector layer can be reached after object to be detected reflection, and connect by light detector layer
It receives.
Detailed description of the invention
Fig. 1 is the functional principle schematic diagram of polarizing film.
Fig. 2 is the functional principle schematic diagram of 1/2 wave plate.
Fig. 3 is the functional principle schematic diagram of quarter wave plate.
Fig. 4 is the structural schematic diagram of the optical sensing module of the embodiment of the present application.
Fig. 5 is the schematic illustration of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Fig. 6 is the light path schematic diagram of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Fig. 7 is another light path schematic diagram of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Fig. 8 is another light path schematic diagram of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Fig. 9 is another schematic illustration of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Figure 10 is another schematic illustration of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Figure 11 is another schematic illustration of the reflected light that disappears of the optical sensing module of the embodiment of the present application.
Figure 12 is the schematic diagram of another optical sensing module structure of the embodiment of the present application.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the application is described.
The optical sensing module of the embodiment of the present application in order to better understand is implemented the application below with reference to Fig. 1 to Fig. 3
The relative theory of polarizing film and wave plate in example is simply introduced.
1, polarizing film
Natural light can be become linearly polarized light as a kind of optical device by polarizing film.Each polarizing film have one thoroughly
Optical axis, natural light will become the linearly polarized light that polarization direction is parallel to light transmission axis direction after polarizing film.
As shown in Figure 1, wherein arrow direction indicates polarization direction.For linearly polarized light, if its polarization direction is parallel
In light transmission shaft, so that it may completely through polarizing film；If its polarization direction cannot penetrate polarizing film perpendicular to light transmission shaft.
The light transmission axis direction of polarizing film can be changed by rotatory polarization piece.
2, wave plate
Wave plate, also known as phase delay chip, it is process by the material with birefringence, the polarization of adjustable light
State.There are two orthogonal optical axises for wave plate, and when light passes through wave plate, the ray velocity along the transmission of some direction is very fast, claim the party
To for fast axle, the vertical direction of the corresponding direction, the transmission speed of light is slower, then referred to as slow axis.
When incident light passes through wave plate, it will be broken down into two-beam, a branch of fast axle for being parallel to wave plate is a branch of to be parallel to
The slow axis of wave plate, since the transmission speed of the corresponding light of fast and slow axis is different, this two-beam can generate phase difference when passing through wave plate, lead to
This two-beam forms light beam again after crossing wave plate, but since the phase of this two-beam is different, is formed after wave plate
That Shu Guang can also show different polarization states.If the phase difference of the two-beam is 180 degree, this wave plate is referred to as 1/2
Wave plate or half-wave plate, as shown in Fig. 2, when the fast axle angle theta of the polarization direction of incident light and wave plate is 45 degree, by 1/2
Perpendicular to the polarization direction of incident light, i.e. 2 θ are 90 degree for the polarization direction of emergent light after wave plate.
When the phase difference of above-mentioned two-beam is 90 degree, then this wave plate is referred to as quarter wave plate, by the outgoing of quarter wave plate
Light will become circularly polarized light, as shown in figure 3, circularly polarized light does not have polarization direction.It, can be with if two pieces of quarter wave plate fast axles are parallel
1/2 wave plate is formed, it follows that circularly polarized light can change into linearly polarized light using a quarter wave plate；Two pieces of quarter wave plates
If fast axle is vertical, any influence will not be generated to the polarization state of the light of process.
Fig. 4 is the structural schematic diagram of the optical sensing module 100 of the embodiment of the present application.The optical sensing module 100 includes:
Second wave plate 101, the second polarizing film 102, light detector layer 103 and light source layer 104；
Wherein, second wave plate 101, the second polarizing film 102, light detector layer 103 are from top to bottom successively matched with light source layer 104
It is placed in optical sensing module 100.
The optical sensing module 100 is generally disposed in the lower section of display module, as shown in figure 5, the display module by upper and
Under be configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer.
Wherein, the polarization direction of first polarizing film is vertical with the polarization direction of the second polarizing film 102, second wave plate
101 fast axle is parallel with the fast axle of first wave plate, and first wave plate and second wave plate 101 are quarter-wave plate, or
Person, the polarization direction of first polarizing film is parallel with the polarization direction of the second polarizing film 102, the fast axle of second wave plate 101 with
The fast axle of first wave plate is vertical, and first wave plate and second wave plate 101 are quarter-wave plate.
It should be noted that the light detector layer 103 is shown mould group for detecting in the light that light source layer 104 issues upwards
In transparent panel upper surface object to be detected (for example, fingerprint) reflection after reflection light, thus according to the fingerprint detected
Reflection light, realize identification to finger print information.
By the way that the optical sensing module 100 in the embodiment of the present application is placed in the lower section of display module, and to show
Show the second polarizing film in the fast axle of the first wave plate in mould group, the polarization direction of the first polarizing film and optical sensing module 100
102 polarization direction, the second wave plate 101 fast axle between there is determining corresponding relationship, enable to light source layer 104 to send out upwards
Light out is filtered out in the luminescent layer reached in display module and after being reflected by luminescent layer, i.e., so that after being reflected by luminescent layer
Light cannot reach light detector layer 103, while the light that light source layer 104 is issued upwards is transparent in arrival display module
The object to be detected of panel upper surface simultaneously can be reached light detector layer 103 after object to be detected reflection, and be connect by light detector layer 103
It receives.
Below with reference to optical sensing module 100 shown in Fig. 4 and Fig. 5 to the elimination luminescent layer in the embodiment of the present application
The technical solution of reflected light be illustrated.
Optionally, being formed by acute angle between the polarization direction of first polarizing film and the fast axle of first wave plate is
45 degree, it is 45 degree that acute angle is formed by between the polarization direction of second polarizing film and the fast axle of second wave plate
Scheme one
It is 45 degree that acute angle is formed by between the polarization direction of first polarizing film and the fast axle of first wave plate, this
It is 45 degree that acute angle is formed by between the polarization direction of two polarizing films 102 and the fast axle of second wave plate 101, the first polarization
The polarization direction of piece is vertical with the polarization direction of the second polarizing film 102, and the fast axle of second wave plate 101 is fast with first wave plate
Axis is parallel, and first wave plate and second wave plate 101 are quarter-wave plate.
Specifically, the light that light source layer 104 issues upwards can be successively first after the second polarizing film 102, the second wave plate 101
First reach display module luminescent layer, reach luminescent layer all light in, a portion light can by luminescent layer after
It is continuous to upwardly propagate, the transparent side in the first wave plate, the first polarizing film and display module can be successively passed through during upwardly propagating
The object to be detected of transparent panel upper surface is reached after plate.
Wherein, after the second polarizing film 102, corresponding incident ray can change the light that light source layer 104 issues upwards
For polarization direction polarised light identical with the polarization direction of the second polarizing film 102, polarised light meeting after second wave plate 101
It is changed into circularly polarized light, due to being formed by acute angle between the polarization direction of the second polarizing film 102 and the fast axle of the second wave plate 101
Angle is 45 degree, and therefore, which reaches luminescent layer, and after being reflected by luminescent layer again through the second wave plate 101 after,
The vertical polarised light in the polarization direction of the second polarizing film of polarization direction 102 can be changed into, therefore, the light reflected by luminescent layer
It cannot cannot received by light detector layer 103 by the second polarizing film 102 after the second wave plate 101.Light source layer 104 to
The light of upper sending is as shown in Figure 6 to the optical path between luminescent layer in the second polarizing film 102.
For the light of propagation is continued up in the light that light source layer 104 issues upwards by luminescent layer, the part
Light can be changed into circularly polarized light after second wave plate 101, polarization direction and the second wave due to the second polarizing film 102
It is 45 degree that acute angle is formed by between the fast axle of piece, and the fast axle of the first wave plate is parallel with the fast axle of the second wave plate 101,
Therefore, which continues up propagation, after the first wave plate, can be changed into polarization direction and the second polarizing film 102
The vertical polarised light in polarization direction, since the first polarizing film is vertical with the polarization direction of the second polarizing film 102, pass through
The partial poolarized light after first wave plate can reach the object to be detected of transparent panel upper surface by the first polarizing film completely
And reflected by the object to be detected, parallel first of the first polarizing film, fast axle is successively passed through by the polarised light after object to be detected reflection
After wave plate and the second wave plate 101, the polarization direction polarised light parallel with the polarization direction of the second polarizing film 102 can be changed into, it should
Polarised light can reach light detector layer by the second polarizing film 102 completely, and be received by light detector layer.Light source layer 104 is sent out upwards
Light out is as shown in Figure 7 to the optical path between transparent panel in the second polarizing film 102.
Scheme two
It is 45 degree that acute angle is formed by between the polarization direction of first polarizing film and the fast axle of first wave plate, this
It is 45 degree that acute angle is formed by between the polarization direction of two polarizing films 102 and the fast axle of second wave plate 101, the first polarization
The polarization direction of piece is parallel with the polarization direction of the second polarizing film 102, and the fast axle of second wave plate 101 is fast with first wave plate
Axis is vertical, and first wave plate and second wave plate 101 are quarter-wave plate.
Specifically, the light that light source layer 104 issues upwards can be successively first after the second polarizing film 102, the second wave plate 101
First reach display module luminescent layer, reach luminescent layer all light in, a portion light can by luminescent layer after
It is continuous to upwardly propagate, the transparent side in the first wave plate, the first polarizing film and display module can be successively passed through during upwardly propagating
The object to be detected of transparent panel upper surface is reached after plate.
Wherein, after the second polarizing film 102, corresponding incident ray can change the light that light source layer 104 issues upwards
For polarization direction polarised light identical with the polarization direction of the second polarizing film 102, polarised light meeting after second wave plate 101
It is changed into circularly polarized light, due to being formed by acute angle folder between the polarization direction of the second polarizing film 102 and the fast axle of the second wave plate
Angle is 45 degree, therefore, circularly polarized light arrival luminescent layer, and after being reflected by luminescent layer again through the second wave plate 101 after, meeting
It is changed into the vertical polarised light in the polarization direction of the second polarizing film of polarization direction 102, therefore, this is existed by the light that luminescent layer reflects
It cannot cannot be received by light detector layer 103 by the second polarizing film 102 after the second wave plate 101.Light source layer 104 is upward
The light of sending is as shown in Figure 6 to the optical path between luminescent layer in the second polarizing film 102.
For the light of propagation is continued up in the light that light source layer 104 issues upwards by luminescent layer, the part
Light can be changed into circularly polarized light after second wave plate 101, polarization direction and the second wave due to the second polarizing film 102
It is 45 degree that acute angle is formed by between the fast axle of piece, and the fast axle of the first wave plate is vertical with the fast axle of the second wave plate 101,
Therefore, which continues up propagation, after the first wave plate, can be changed into polarised light, the polarization side of the polarised light
To polarization direction and the polarization of the first polarizing film identical as the polarization direction of the second polarizing film 102, due to the second polarizing film 102
Direction is parallel, and therefore, which can reach the object to be detected and quilt of transparent panel upper surface by the first polarizing film completely
The object reflection to be detected, successively passes through the first vertical wave plate of the first polarizing film, fast axle by the polarised light after object to be detected reflection
After the second wave plate 101, since the first wave plate is vertical with the fast axle of the second wave plate 101, passed through after object to be detected reflection
After fast axle vertical the first wave plate and the second wave plate 101, polarization direction can't be sent out the polarised light of first polarizing film
It is raw to change, since the polarization direction of the first polarizing film is parallel with the polarization direction of the second polarizing film 102, by object to be detected
Polarised light after reflection after the first polarizing film, fast axle vertical the first wave plate and the second wave plate 101, can successively lead to completely
It crosses the first polarizing film 101 and reaches light detector layer 103, and received by light detector layer 103.The light that light source layer 104 issues upwards exists
Second polarizing film 102 is as shown in Figure 8 to the optical path between transparent panel.
It should be noted that above-mentioned only to be formed between the polarization direction of the first polarizing film and the fast axle of first wave plate
Acute angle be 45 degree, be formed by between the polarization direction of second polarizing film 102 and the fast axle of second wave plate 101 sharp
Angle angle is illustrated the technical solution of the reflected light of the elimination luminescent layer of the embodiment of the present application for being 45 degree, but the application
It's not limited to that for embodiment, for example, being formed by between the polarization direction of the first polarizing film and the fast axle of first wave plate sharp
Angle angle can also be 30 degree, be formed by between the polarization direction of second polarizing film 102 and the fast axle of second wave plate 101
Acute angle can also be 30 degree.
Optionally, on the basis of above scheme one and scheme two, which further includes compensation wave plate
105, which is configured at the upper surface of second wave plate 101, the fast axle of the compensation wave plate 105 and optical plastic
Fast axle is vertical, which is configured at the lower surface of the luminescent layer.
Optionally, which is Organic Light Emitting Diode (Organic light-emitting diode, OLED) layer.
Specifically, for luminescent layer flexible (for example, Organic Light Emitting Diode oled layer), in order to be carried out to the oled layer
Protection, it will usually increase by one layer of optical plastic in the lower surface of oled layer, as shown in Figure 9.
The optical plastic has the characteristic of birefringence, and concrete principle is consistent with wave plate, and therefore, the lower surface of oled layer increases
The optical plastic added can generate interference to the polarization direction of incident light, therefore, it is possible to lead to the light beam reflected by luminescent layer not
It can be eliminated completely by the second polarizing film 102.
For the interference for overcoming optical plastic to generate the polarization direction of incident light, which further includes
Wave plate 105 is compensated, which is configured at the upper surface of second wave plate 101, the fast axle and light of the compensation wave plate 105
The fast axle for learning plastics is vertical, i.e., the compensation wave plate 105 is equivalent to two blocks of parallel wave plates of fast axle, therefore, the benefit with optical plastic
Any influence can't be generated to the polarization direction of the polarised light of process by repaying wave plate 105 and optical plastic, so that by shining
The polarization direction of the polarised light of the second polarizing film of arrival 102 after layer reflection and the polarization direction of the second polarizing film 102 are hung down completely
Directly, further such that the polarised light of the second polarizing film of arrival 102 after being reflected by luminescent layer can be completely by the second polarizing film 102
It filters out.
Wherein, the material of the compensation wave plate 105 and thickness are identical as the optical plastic.
By increasing compensation wave plate 105 in optical sensing module 100, so that the material of the compensation wave plate 105 and thickness
Degree is identical as the optical plastic, and it is vertical with the fast axle of optical plastic to make the fast axle of the compensation wave plate 105, to overcome the light
Influence of the plastics to the polarization state of light is learned, enables the polarised light of the second polarizing film of the arrival after being reflected by luminescent layer 102
It is filtered out completely by the second polarizing film 102.
It should be noted that in Fig. 5 of the embodiment of the present application, the original of the reflected light that disappears of optical sensing module shown in Fig. 9
It manages in schematic diagram, in order to which the optical path of the light issued upwards to light source layer 104 is more intuitively showed, in Fig. 5 and Figure 10
It is middle to be exaggerated the distance between light detector layer 103 and the second polarizing film 102, but this is not constituted the embodiment of the present application
Any restriction in actual product, can be bonded, i.e. light detector layer 103 completely between light detector layer 103 and the second polarizing film 102
Any gap can be not present between the second polarizing film 102.
It is anti-to the elimination luminescent layer in the embodiment of the present application for the above-mentioned only optical sensing module 100 shown in Fig. 4
The principle for penetrating light is illustrated, but the embodiment of the present application is not limited to this.
Optionally, light source layer 104 may be located on the upper surface of light detector layer 103, as shown in Figure 10, the optical detection group
Part 100 is from top to bottom configured in order: the second wave plate 101, the second polarizing film 102, light source layer 104 and light detector layer 103.
The optical sensing module 100 is generally disposed in the lower section of display module, as shown in Figure 10, the display module by upper and
Under be configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer.
When light source layer 104 is located at the upper surface of light detector layer 103, the fast axle of the first wave plate in display module, first
The polarization direction of the polarization direction of polarizing film and the second polarizing film 102 in optical sensing module 100, the second wave plate 101 it is fast
It is consistent described in corresponding relationship and scheme one, scheme two between axis, specifically eliminate the technical side of the reflected light of luminescent layer
It is consistent described in case and scheme one, scheme two, for sake of simplicity, details are not described herein again.
It should be noted that being required at this time when light source layer 104 is located at 103 lower surface of light detector layer in light detector layer 103
When the upper position for arranging probe unit and cabling, reserves the light that opening allows light source layer 104 to issue and penetrate；At light source layer 104
When 103 upper surface of light detector layer, light source layer 104 is required to be located at the part of 103 top of light detector layer by translucent material system at this time
At.
Optionally, on the basis of optical sensing module 100 shown in Fig. 10, the optical sensing module 100 further include: the
Three polarizing films 106, the third polarizing film 106 are configured between the light source layer 104 and the light detector layer 103, the third polarizing film
106 polarization direction is identical as the polarization direction of second polarizing film 102.
Specifically, when light source layer 104 is located at the upper surface of light detector layer 103, the light that light source layer 104 issues downwards has
Light detector layer 103 may be reached, is received by light detector layer 103, however, the light that light source layer 104 issues downwards is for detection
For layer 104, belongs to invalid detection light, effective detection light in total light that light detector layer 104 receives can be reduced
Ratio.
Therefore, on the basis of optical sensing module 100 shown in Fig. 10, which further includes third
Polarizing film 106, the third polarizing film 106 are configured between the light source layer 104 and the light detector layer 103, as shown in figure 11, so that
By decaying 50% after third polarizing film 106 in the light that light source layer 104 issues downwards, in order to guarantee to be reflected by object to be detected
Can be received afterwards by light detector layer 104 by the polarised light of the second polarizing film 102, the polarization direction of the third polarizing film 106 with
The polarization direction of second polarizing film 102 is identical.
By configuring third polarizing film 106 between light source layer 104 and light detector layer 103, and make the third polarizing film
106 polarization direction is identical as the polarization direction of second polarizing film 102, so that the light that light source layer 104 issues downwards
In by decaying 50% after third polarizing film 106, and can guarantee after being reflected by object to be detected through the second polarizing film 102
Polarised light can be received by light detector layer 104.
It should be noted that the reflected light that disappears of the optical sensing module shown in Figure 10, Figure 11 of the embodiment of the present application
In schematic illustration, when luminescent layer be oled layer when, equally can the lower surface of oled layer increase by one layer of optical plastic, and
The upper surface of second wave plate 101 configures a block compensation wave plate, dry to overcome optical plastic to generate the polarization direction of incident light
It disturbs, specific description please refers to the associated description in above-mentioned Fig. 9, for sake of simplicity, details are not described herein again.
It should also be noted that, the reflected light that disappears of the optical sensing module shown in Figure 10, Figure 11 of the embodiment of the present application
Schematic illustration in, in order to which the optical path of the light issued upwards to light source layer 104 is more intuitively showed, Figure 10 with
The distance between light source layer 104 and the second polarizing film 102 are exaggerated in Figure 11, but this is to the embodiment of the present application structure
At any restriction, in actual product, can be bonded completely between light source layer 104 and the second polarizing film 102, i.e., light source layer 104 with
Any gap can be not present between second polarizing film 102.
It should be noted the optical sensing module shown in Fig. 5, Fig. 9, Figure 10 and Figure 11 of the embodiment of the present application
The reflected light that disappears schematic illustration in, object to be detected is not shown, it is actually detected in, level to be detected is in display module
The upper surface of transparent panel.
Optionally, object to be detected involved in the embodiment of the present application can be in fingerprint, palmmprint, face or other objects
Any one, the embodiment of the present application is not particularly limited this.
Optionally, light source layer 104 involved in the embodiment of the present application be specifically as follows single laser, array laser,
It is any one in light emitting diode (Light-emitting diode, LED) or the area source being made of light source and light guide plate
Kind, the application is not particularly limited this.
Optionally, light detector layer 103 involved in the embodiment of the present application is specifically as follows single optical detector, detector array
Column, complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) image sensing
Any one in device or charge coupled cell (Charge-coupled Device, CCD) imaging sensor, the application couple
This is not particularly limited.
In the embodiment of the present application, additionally provide a kind of optical sensing module 200, the optical sensing module 200 by upper and
Under be configured in order light source layer 201, the second polarizing film 202, light detector layer 203.
The optical sensing module 200 is generally disposed in the lower section of display module, as shown in figure 12, the display module by upper and
Under be configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer.
Wherein, the light source layer 201 be polarization state light active layer, and the light source layer 201 issue polarised light polarization direction
It is vertical with the polarization direction of the second polarizing film 202.
By the way that the optical sensing module 200 is placed in the lower section of display module, and the light source layer 201 is issued
Light is polarised light, and the polarization direction of the polarised light is vertical with the polarization direction of the second polarizing film 202, so that light source layer 201
The polarization direction of polarised light after what is issued upwards reflected by luminescent layer is vertical with the polarization direction of the second polarizing film 202, so that
Polarised light after being reflected by luminescent layer is filtered out, and make light source before reaching light detector layer 203 by the second polarizing film 202
Before reaching light detector layer 203 in the polarised light that layer 201 issues downwards, filtered out by the second polarizing film 202, and make light
The polarised light that active layer 201 issues upwards can be reached by light detector layer after the object to be detected reflection of transparent panel upper surface, and
It is received by light detector layer.
It should be noted that the light detector layer 203 is shown mould for detecting in the polarised light that light source layer 201 issues upwards
Reflection light after object to be detected (for example, fingerprint) reflection of transparent panel upper surface in group, thus according to the finger detected
The reflection light of line realizes the identification to finger print information.
It should also be noted that, in the embodiment of the present application, the first wave plate and the second wave plate can be by muti-piece wave respectively
The quarter-wave plate that piece is composed, alternatively, can also be respectively one block of individual quarter-wave plate, the embodiment of the present application
This is not particularly limited.
The application further includes a kind of terminal device, the terminal device include above the display module in any embodiment with
And optical sensing module 100 or optical sensing module 200, wherein the optical sensing module 100 or optical sensing module 200
In the lower section of display module.The terminal device specifically can be comprising display screen (for example, the transparent side in the embodiment of the present application
Plate) intelligent terminal, for example, the terminal device can be smart phone, tablet computer, wearable device, PC
Etc..
Pass through optical sensing module 100 or light in configuration the embodiment of the present application middle below the display module in terminal device
Detection components 200 are learned, so that the light after being reflected by luminescent layer is complete before reaching light detector layer 103 or light detector layer 203
The light for filtering out entirely, while light source layer 104 or light source layer 201 being issued upwards is on reaching the transparent panel in display module
The object to be detected on surface simultaneously can be reached light detector layer 103 or light detector layer 203 after object to be detected reflection, and by light detector layer
103 or light detector layer 203 receive.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), arbitrary access are deposited
The various media that can store program code such as reservoir (Random Access Memory, RAM), magnetic or disk.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (10)
1. a kind of optical sensing module, the optical sensing module is located at the lower section of display module, the display module by upper and
Under be configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer, which is characterized in that the optical sensing module
From top to bottom it is configured in order:
Second wave plate, the second polarizing film, light detector layer and light source layer；
Wherein, the polarization direction of first polarizing film is vertical with the polarization direction of the second polarizing film, second wave plate it is fast
Axis is parallel with the fast axle of first wave plate, and first wave plate and second wave plate are quarter-wave plate, or
The polarization direction of first polarizing film is parallel with the polarization direction of the second polarizing film, the fast axle of second wave plate and institute
The fast axle for stating the first wave plate is vertical, and first wave plate and second wave plate are quarter-wave plate.
2. optical sensing module according to claim 1, which is characterized in that the polarization direction of first polarizing film and institute
Stating and being formed by acute angle between the fast axle of the first wave plate is 45 degree, the polarization direction of second polarizing film and described second
It is 45 degree that acute angle is formed by between the fast axle of wave plate.
3. optical sensing module according to claim 1 or 2, which is characterized in that the optical sensing module further includes mending
Repay wave plate, the compensation wave plate is configured at the upper surface of second wave plate, the fast axle of the compensation wave plate and optical plastic
Fast axle is vertical, and the optical plastic is configured at the lower surface of the luminescent layer.
4. optical sensing module according to any one of claim 1 to 3, which is characterized in that the luminescent layer is organic
Light emitting diode oled layer.
5. a kind of optical sensing module, the optical sensing module is located at the lower section of display module, the display module by upper and
Under be configured in order transparent panel, the first polarizing film, the first wave plate and luminescent layer, which is characterized in that the optical sensing module
From top to bottom it is configured in order:
Second wave plate, the second polarizing film, light source layer and light detector layer；
Wherein, the polarization direction of first polarizing film is vertical with the polarization direction of the second polarizing film, second wave plate it is fast
Axis is parallel with the fast axle of first wave plate, and first wave plate and second wave plate are quarter-wave plate, or
The polarization direction of first polarizing film is parallel with the polarization direction of the second polarizing film, the fast axle of second wave plate and institute
The fast axle for stating the first wave plate is vertical, and first wave plate and second wave plate are quarter-wave plate.
6. optical sensing module according to claim 5, which is characterized in that the polarization direction of first polarizing film and institute
Stating and being formed by acute angle between the fast axle of the first wave plate is 45 degree, the polarization direction of second polarizing film and described second
It is 45 degree that acute angle is formed by between the fast axle of wave plate.
7. optical sensing module according to claim 5 or 6, which is characterized in that the optical sensing module further includes mending
Repay wave plate, the compensation wave plate is configured at the upper surface of second wave plate, the fast axle of the compensation wave plate and optical plastic
Fast axle is vertical, and the optical plastic is configured at the lower surface of the luminescent layer.
8. optical sensing module according to any one of claims 5 to 7, which is characterized in that the optical sensing module
Further include:
Third polarizing film, the third polarizing film are configured between the light source layer and the light detector layer, the third polarization
The polarization direction of piece is identical as the polarization direction of second polarizing film.
9. the optical sensing module according to any one of claim 5 to 8, which is characterized in that the luminescent layer is organic
Light emitting diode oled layer.
10. a kind of terminal device, which is characterized in that including optical sensing module as claimed in any one of claims 1-9 wherein with
Display module, the optical sensing module are located at the lower section of the display module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995710.6A CN109696682A (en) | 2017-10-23 | 2017-10-23 | Optical sensing module and terminal device |
| PCT/CN2018/111057 WO2019080778A1 (en) | 2017-10-23 | 2018-10-19 | Optical detection component and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995710.6A CN109696682A (en) | 2017-10-23 | 2017-10-23 | Optical sensing module and terminal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109696682A true CN109696682A (en) | 2019-04-30 |
Family
ID=66226056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710995710.6A Pending CN109696682A (en) | 2017-10-23 | 2017-10-23 | Optical sensing module and terminal device |
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|---|---|
| CN (1) | CN109696682A (en) |
| WO (1) | WO2019080778A1 (en) |
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| CN110265442A (en) * | 2019-06-14 | 2019-09-20 | 京东方科技集团股份有限公司 | Display base plate and display panel comprising it |
| CN111052140A (en) * | 2019-10-18 | 2020-04-21 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN111917906A (en) * | 2020-08-05 | 2020-11-10 | 维沃移动通信有限公司 | Electronic device |
| CN111988456A (en) * | 2020-08-28 | 2020-11-24 | Oppo广东移动通信有限公司 | Display screen assembly, electronic device and ambient light detection method |
| CN112036325A (en) * | 2020-09-01 | 2020-12-04 | 胜薪科技股份有限公司 | Fingerprint identification module and display device |
| CN112639529A (en) * | 2020-07-30 | 2021-04-09 | 华为技术有限公司 | Laser radar and intelligent vehicle |
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| WO2019080778A1 (en) | 2019-05-02 |
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Application publication date: 20190430 |
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