CN107392132A - A kind of display panel and display device - Google Patents
A kind of display panel and display device Download PDFInfo
- Publication number
- CN107392132A CN107392132A CN201710575222.XA CN201710575222A CN107392132A CN 107392132 A CN107392132 A CN 107392132A CN 201710575222 A CN201710575222 A CN 201710575222A CN 107392132 A CN107392132 A CN 107392132A
- Authority
- CN
- China
- Prior art keywords
- display panel
- polaroid
- cover plate
- protective cover
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
Abstract
The present invention, which provides a kind of display panel and display device, display panel, to be included：Array base palte, polaroid and the protective cover plate being cascading；Multiple fingerprint identification units, positioned at the polaroid away from the protective cover plate side；Fresnel prism, positioned at the array base palte away from the protective cover plate side；Fingerprint recognition light source, directional light is sent away from the protective cover plate side, the fingerprint recognition light source positioned at the Fresnel prism；The Fresnel prism has the bottom surface parallel with the polaroid, incidence surface incidence of the directional light that the fingerprint recognition light source is sent perpendicular to the Fresnel prism；The normal of the incident direction for the directional light that the fingerprint recognition light source is sent and plane where the polaroid forms the plane of incidence, and the plane of incidence and direction where the absorption axiss of the polaroid are perpendicular or parallel.The present invention provides a kind of display panel and display device, to improve the accuracy of fingerprint recognition.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of display panel and display device.
Background technology
It is unique because fingerprint is all come with body for everyone.With the development of science and technology, market
On there are a variety of display devices with fingerprint identification function, such as mobile phone, tablet personal computer and intelligent wearable device.This
Sample, user is before the display device with fingerprint identification function is operated, it is only necessary to the fingerprint recognition of finger touch display unit
Unit, it is possible to carry out Authority Verification, simplify Authority Verification process.
Fingerprint is made up of the series of ridges positioned at finger tip skin surface and paddy, the ridge that is received due to fingerprint identification unit and
The light intensity of paddy reflection is different so that by the reflected light that is formed in the opening position of ridge and the reflected light that is formed of opening position in paddy
The current/voltage signal magnitude being converted into is different, then can carry out fingerprint recognition according to current/voltage signal magnitude.Typically
For, outer except reflection occurs in the opening position of ridge, it also occur that scattering and refraction, the opening position caused in ridge forms anti-
Penetrate light intensity be less than paddy opening position formed reflected light intensity, but either ridge opening position formed reflection
The intensity for the reflected light that the intensity of light is still formed in the opening position of paddy is all smaller, and this is just the detection of fingerprint sensor
Ability proposes higher requirement, influences the accuracy of fingerprint recognition.
The content of the invention
The present invention provides a kind of display panel and display device, to realize the accuracy for improving fingerprint recognition.
In a first aspect, the embodiment of the present invention provides a kind of display panel, including：
Array base palte, polaroid and the protective cover plate being cascading；
Multiple fingerprint identification units, positioned at the polaroid away from the protective cover plate side；
Fresnel prism, positioned at the array base palte away from the protective cover plate side；
Fingerprint recognition light source, positioned at the Fresnel prism away from the protective cover plate side, the fingerprint recognition light source
Send directional light；
The Fresnel prism has the bottom surface parallel with the polaroid, the directional light that the fingerprint recognition light source is sent
Incidence surface perpendicular to the Fresnel prism is incident；The incident direction for the directional light that the fingerprint recognition light source is sent with it is described
The normal of plane where polaroid forms the plane of incidence, and the plane of incidence and direction where the absorption axiss of the polaroid are vertical or flat
OK.
Second aspect, the embodiment of the present invention also provide a kind of display device, including the display panel described in first aspect.
Display panel provided by the invention includes array base palte, polaroid, protective cover plate, multiple fingers for fingerprint recognition
Line recognition unit, fingerprint recognition light source and Fresnel prism, fingerprint recognition light source can send directional light, can avoid difference
Crosstalk caused by reflection light at touch location is received by same fingerprint identification unit, Fresnel prism has and polaroid
Parallel bottom surface, therefore can to the display panel structure polaroid and protective cover plate from the bottom surface of Fresnel prism
Work is parallel flat, and propagation of the light in parallel flat meets the law of refraction of light and in approximately the same plane.Normal conditions
Under, a branch of linearly polarized light is changed into a branch of elliptically polarized light after reflection, and elliptically polarized light light intensity after polaroid can subtract
Weak, in the embodiment of the present invention, the directional light that fingerprint recognition light source is sent is incident perpendicular to the incidence surface of Fresnel prism, and fingerprint is known
The normal of the incident direction for the directional light that other light source is sent and plane where polaroid forms the plane of incidence, and fingerprint recognition light source is sent
Directional light be changed into linear polarization by polaroid rear polarizer state, direction where the absorption axiss of the plane of incidence and polaroid is vertical or flat
OK, now, polarization state of the linearly polarized light after the reflection of protective cover plate is linear polarization, therefore can nondestructively pass through polarisation
Piece reaches fingerprint identification unit, eliminates decrease effect of the polaroid to fingerprint reflected light (fingerprint signal), improves fingerprint knowledge
Other accuracy.
Brief description of the drawings
Fig. 1 is the schematic diagram that a kind of light is propagated in parallel flat；
Fig. 2 a are a kind of cross-sectional view of display panel provided in an embodiment of the present invention；
Fig. 2 b are the dimensional structure diagram of the part-structure of display panel in Fig. 2 a；
Fig. 2 c are a kind of sectional view of Fresnel prism provided in an embodiment of the present invention；
Fig. 3 is the cross-sectional view of another display panel provided in an embodiment of the present invention；
Fig. 4 is the cross-sectional view of another display panel provided in an embodiment of the present invention；
Fig. 5 a are the cross-sectional view of another display panel provided in an embodiment of the present invention；
Fig. 5 b are the index path that light is propagated shown in Fig. 5 a；
Fig. 6 is the cross-sectional view of another display panel provided in an embodiment of the present invention；
Fig. 7 is the index path that a kind of linearly polarized light is totally reflected in the interface of protective cover plate and air；
Fig. 8 is a kind of structural representation of display device provided in an embodiment of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Fig. 1 is the schematic diagram that a kind of light is propagated in parallel flat, as shown in figure 1, the direction of arrow represents that light is propagated
Direction, multiple parallel flats are sequentially placed, and the light incident from first parallel flat j1 is in first parallel flat j1 and the
Two parallel flat j2 interface reflects, and can be obtained according to the law of refraction of light：nj1Sin (β 1)=nj2·sin
(β 2), wherein, nj1For first parallel flat j1 refractive index, β 1 is the incidence angle of first parallel flat, nj2For second
The refractive index of parallel flat, β 2 are the incidence angle of second parallel flat；The light incident from second parallel flat j2 is the
Two parallel flat j2 and the 3rd parallel flat j3 interface reflect, and can be obtained according to the law of refraction of light：
nj2Sin (β 2)=nj3Sin (β 3), wherein, nj3For the refractive index of the 3rd parallel flat, β3For the 3rd parallel flat
Incidence angle, by more than analysis can obtain：nj1Sin (β 1)=nj2Sin (β 2)=nj3Sin (β 3), if shared m flat
Row flat board is sequentially placed, according to above-mentioned analysis the like can obtain：nj1Sin (β 1)=nj2Sin (β 2)=nj3·
Sin (β 3)=...=njmSin (β m), wherein, njmFor the refractive index of m-th of parallel flat, β m are m-th of parallel flat
Incidence angle.
The light incident from first parallel flat j1, in first parallel flat j1 and second parallel flat j2 friendship
Interface reflect after in second parallel flat along straightline propagation, in second parallel flat j2 and the 3rd parallel flat
J3 interface reflect after in the 3rd parallel flat along straightline propagation, the like, light is in m-th of parallel flat
It is middle along straightline propagation, and the light in second parallel flat j2 is both first parallel flat j1 and second parallel flat j2
Interface refracted light, be again second parallel flat j2 and the 3rd parallel flat j3 interface incident ray,
Light in 3rd parallel flat j3 is both the refraction of second parallel flat j2 and the 3rd parallel flat j3 interface
Light, be the incident ray of the 3rd parallel flat j3 and the 4th parallel flat j4 interface again, the like to multiple
The parallel flat sequentially placed.It will be appreciated by those skilled in the art that incident ray and refracted light be in approximately the same plane, then
When light is propagated in multiple parallel flats in approximately the same plane.
Fig. 2 a are a kind of cross-sectional view of display panel provided in an embodiment of the present invention, and Fig. 2 b are to be shown in Fig. 2 a
The dimensional structure diagram of the part-structure of panel, Fig. 2 c are a kind of section of Fresnel prism provided in an embodiment of the present invention
Figure, with reference to shown in Fig. 2 a, Fig. 2 b and Fig. 2 c, the direction of arrow represents the light direction of propagation, and display panel includes：It is cascading
Array base palte 10, polaroid 21 and protective cover plate 30.Protective cover plate 30, which has, protects display panel from the work of mechanical damage
With protective cover plate 30 can contact with finger when carrying out touch control operation to display panel.Multiple fingerprint identification units 40 are positioned at inclined
Mating plate 21 is away from the side of protective cover plate 30.Fresnel prism 50 is located at array base palte 10 away from the side of protective cover plate 30.Fingerprint is known
Other light source 60 is located at Fresnel prism 50 and sends directional light away from the side of protective cover plate 30, fingerprint recognition light source 60.Fresnel rib
Mirror 50 has the bottom surface 51 parallel with polaroid 21, and the directional light that fingerprint recognition light source 60 is sent is perpendicular to Fresnel prism 50
Incidence surface 52 is incident, and the normal of the incident direction and the place plane of polaroid 21 of the directional light that fingerprint recognition light source 60 is sent is formed
Direction where the absorption axiss PP of plane of incidence S0, plane of incidence S0 and polaroid 21 is perpendicular or parallel, with plane of incidence S0 and partially in Fig. 2 b
The parallel carry out example explanation in direction where the absorption axiss PP of mating plate 21, not limitation of the invention.Wherein, it is a branch of unpolarized
Light is changed into linearly polarized light after polaroid 21, and the polarized component parallel with the extinction axle PP directions of polaroid 21 is inhaled by polaroid
Receive, the polarized component vertical with the extinction direction of principal axis of polaroid 21 can nondestructively be passed through, be then changed into after polaroid 21
The polarization direction of linearly polarized light is vertical with the extinction axle PP directions of polaroid 21.
Display panel provided in an embodiment of the present invention, which includes array base palte, polaroid, protective cover plate, multiple fingerprints that are used for, to be known
Other fingerprint identification unit, fingerprint recognition light source and Fresnel prism, fingerprint recognition light source can send directional light, can keep away
Exempt from crosstalk caused by reflection light at different touch locations is received by same fingerprint identification unit, Fresnel prism have with
The parallel bottom surface of polaroid, therefore from the bottom surface of Fresnel prism to the display panel structure polaroid and protective cover plate
Parallel flat is can be regarded as, propagation of the light in parallel flat meets the law of refraction of light and in approximately the same plane.It is logical
In the case of often, a branch of linearly polarized light is changed into a branch of elliptically polarized light after reflection, and this is due to the polarization direction of linearly polarized light
Parallel component (parallel to the plane of incidence) and vertical component (perpendicular to the plane of incidence) be present simultaneously, before reflecting interface is incided,
The integral multiple that phase difference between vertical component and horizontal component is π, and after the reflection of reflecting interface, vertical component and water
Phase difference between the amount of dividing equally is no longer π integral multiple, and so as to cause reflected light to be changed into elliptically polarized light, and elliptically polarized light passes through
Light intensity can weaken after crossing polaroid, and in the embodiment of the present invention, the directional light that fingerprint recognition light source is sent is perpendicular to Fresnel prism
Incidence surface it is incident, the normal of the incident direction and plane where polaroid of the directional light that fingerprint recognition light source is sent forms incidence
Face, the directional light that fingerprint recognition light source is sent are changed into linear polarization, the suction of the plane of incidence and polaroid by polaroid rear polarizer state
Direction where receiving axle is perpendicular or parallel, and now, the polarization direction of linearly polarized light is in the plane of incidence or perpendicular to the plane of incidence, i.e. line
The polarization direction of polarised light only exists one in parallel component (parallel to the plane of incidence) or vertical component (perpendicular to the plane of incidence),
Polarization state of the linearly polarized light after the reflection of protective cover plate remains as linear polarization, and polarization direction is hung down with extinction direction of principal axis
Directly, therefore fingerprint identification unit nondestructively can be reached by polaroid, eliminating polaroid, (fingerprint is believed to fingerprint reflected light
Number) decrease effect, improve the accuracy of fingerprint recognition.
Fingerprint is made up of the series of ridges 71 positioned at finger tip skin surface and paddy 72, because fingerprint identification unit 40 receives
The light intensity that reflects of ridge 71 and paddy 72 it is different so that by the reflected light formed in the opening position of ridge 71 and in the position of paddy 72
The current/voltage signal magnitude that the reflected light that place is formed is converted into is different, then can be carried out according to current/voltage signal magnitude
Fingerprint recognition.In general, it is outer except reflection occurs in the opening position of ridge 71, it also occur that scattering and reflecting, cause in ridge
The intensity for the reflected light that 71 opening position is formed is less than the intensity in the reflected light of the opening position formation of paddy 72.Alternatively, protect
The refractive index of cover plate 30 is n1, the refractive index of Fresnel prism 50 is n2, directional light that fingerprint recognition light source 60 is sent incides anti-
Incidence angle of the protecting cover plate 30 away from the side surface of array base palte 10 1 is θ1, the directional light that fingerprint recognition light source 60 is sent incides phenanthrene
The incidence angle of the bottom surface 51 of alunite ear prism 50 is θ2, θ1And θ2Meet：
When the directional light that fingerprint recognition light source 60 is sent is in protective cover plate 30 and the interface of outside air (position for corresponding to paddy 72)
When being totally reflected, meet：n1·sinθ1≥nairSin (90 °), wherein, nairFor the refractive index of air, i.e. nair=1, and
It can be regarded as putting down to the display panel structure polaroid 21 and protective cover plate 30 from the bottom surface 51 of Fresnel prism 50
Row flat board, n1·sinθ1=n2·sinθ2, therefore work as θ1And θ2Meet：
When, the directional light that fingerprint recognition light source 60 is sent is totally reflected in the interface of protective cover plate 30 and outside air, due to hair
During raw total reflection, incide all light energies of protective cover plate 30 and the interface of outside air, by protective cover plate 30 with
The interface of outside air is reflexed in display panel, significantly enhances the light intensity of the opening position reflected light of paddy 72；For ridge 71
Full transmitting will not occur for opening position, but can reflect, scatters and reflect, and reflective light intensity is weaker.The embodiment of the present invention is led to
The position for crossing paddy of the directional light for sending fingerprint recognition light source corresponding to fingerprint in protective cover plate is totally reflected, and is enhanced
The light intensity of paddy opening position reflected light, improve the accuracy of fingerprint recognition.Further, since the reflective light intensity of the opening position of ridge 71 is almost
Do not change, and the increase of the reflective light intensity of the opening position of paddy 72 is more, therefore increase the opening position of ridge 71 and the reflection of the opening position of paddy 72
The difference of light intensity, contrast is improved, therefore be more conducive to form clearly fingerprint detection image.In order to obtain apparent fingerprint
Detection image, in one embodiment, such as the detection numerical value of fingerprint identification unit 40 can be set to be divided into two grades：0 He
1.Wherein, 0 when corresponding to the luminous intensity that receives of fingerprint identification unit 40 and being less than given threshold, i.e., 0 corresponding to ridge 71 position
Place；1 corresponds to the luminous intensity that receives of fingerprint identification unit 40 when being more than or equal to given threshold, i.e., 1 corresponding to paddy 72 position
Place.Or when setting 0 to correspond to the luminous intensity that receives of fingerprint identification unit 40 to be more than or equal to given threshold, i.e., 0 corresponds to paddy
72 opening position；1 corresponds to the luminous intensity that receives of fingerprint identification unit 40 when being less than given threshold, i.e., 1 corresponding to ridge 71
Opening position.
Alternatively, Fresnel prism is prism, and the face shaping of prism is in triangular prism shape, it is however generally that, use three
Incidence surface, reflecting interface/refracting interface of the side of prism as prism, incident ray is in the section of prism.Rhizoma Sparganii
The section of mirror is isosceles triangle, and the drift angle of isosceles triangle isWhen, it can be obtained by Fig. 2 c：I.e.It is full
Foot：It can be seen that when knowing that directional light that fingerprint recognition light source 60 is sent incides the bottom surface 51 of Fresnel prism 50
Incidence angle be θ2When, can be according to formulaTo obtain the drift angle size for the prism that section is isosceles triangle.
Alternatively, the refractive index of protective cover plate 30 is n1, the refractive index of Fresnel prism 50 is n2, protective cover plate 30 with it is luxuriant and rich with fragrance
Alunite ear prism 50 has identical refractive index, i.e. n1=n2, now θ1=θ2.Protective cover plate 30 and Fresnel prism 50 use phase
Same material is made so as to identical refractive index.
Alternatively, protective cover plate 30 is attached at table of the polaroid 21 away from the side of array base palte 10 by liquid optical cement 80
Face.Liquid optical cement 80 has the characteristics of water white transparency, and it can reach light transmittance more than 98%, and adhesive strength is good, can
Solidify under normal temperature or medium temperature condition, and have the characteristics that cure shrinkage is small, color inhibition.
Fig. 3 is the cross-sectional view of another display panel provided in an embodiment of the present invention, as shown in figure 3, arrow
Direction represents the light direction of propagation, and multiple fingerprint identification units 40 are located at side of the array base palte 10 away from polaroid 21.If
Fingerprint identification unit 40 is arranged in display panel, such as fingerprint identification unit 40 is arranged to the array base palte of display panel
In 10, then need in view of the organic light-emitting structure in fingerprint identification unit 40 and array base palte and data wire, scan line etc.
Compatibility, complex designing, and need to change original display panel production equipment and processing procedure.Therefore by multiple fingerprint recognition lists
Member is arranged at side of the array base palte away from polaroid, can on the basis of the original Functional Design of display panel is not changed,
Realize the detection to fingerprint.
Alternatively, display panel also includes first substrate 90, and first substrate 90 is located at array base palte 10 and Fresnel prism
Between 50, and multiple fingerprint identification units 40 are integrated in surface of the first substrate 90 away from the side of Fresnel prism 50.First base
Plate 90 plays a part of supporting and protects multiple fingerprint identification units 40.
Fig. 4 is the cross-sectional view of another display panel provided in an embodiment of the present invention, as shown in figure 4, arrow
Direction represents the light direction of propagation, and first substrate 90 is integrally formed with Fresnel prism 50.First substrate 90 and Fresnel prism
50 can be made of same material, are formed the process of first substrate 90 and Fresnel prism 50 and for example can are：There is provided one
Substrate；The one side of the substrate is etched into concave/convex-shaped structure using the method for dry or wet etch, and concave/convex-shaped structure is in three
Prism-shaped.On the one hand, first substrate and Fresnel prism are integrally formed setting, manufacturing process can be simplified；On the other hand, if
First substrate and Fresnel prism are separately designed and bonded by way of optical cement, even first substrate and Fresnel prism
It is made with same material, because the refractive index of optical cement is different from the refractive index of first substrate and Fresnel prism, therefore
Understand because reflex occurs between the interface and optical cement of first substrate and optical cement and the interface of Fresnel prism,
The light energy for causing to incide in display panel is smaller, causes the capacity usage ratio of fingerprint recognition light source low.Therefore, by the first base
Plate is integrally formed setting with Fresnel prism, is advantageous to improve the capacity usage ratio of fingerprint recognition light source.
Fig. 5 a are the cross-sectional view of another display panel provided in an embodiment of the present invention, and Fig. 5 b are institute in Fig. 5 a
Show the index path that light is propagated, with reference to shown in Fig. 5 a and Fig. 5 b, the direction of arrow represents the light direction of propagation, and display panel also includes
Quarter-wave plate 22, quarter-wave plate 22 is located at polaroid 21 away from the side of protective cover plate 30, and quarter-wave plate 22
Rotatory polarization piece 20 is formed with polaroid 21.The ambient light such as sunshine or light is irradiated in display panel and by display panel
Part reflection can cause glare, and rotatory polarization piece has the function that to prevent glare.There is reflex to ambient light in display panel
Part such as the source-drain electrode and metal routing that can be reflecting electrode, thin film transistor (TFT).
For clarity, below so that quarter-wave plate 22 is made using calcite material as an example, to rotatory polarization piece 20
Prevent that the process of glare from simply being introduced：The embodiment of the present invention is observed in face of the light direction of propagation, a branch of unpolarized light
When (such as sunshine) enters display panel, its elder generation is changed into polarization direction with absorbing from unpolarized light after polaroid 21
The vertical linearly polarized light in axle PP directions, then linearly polarized light be changed into left circularly polarized light after quarter-wave plate 22, the left side
Reversely (i.e. with inciding display after reflection of the rounding polarised light by part in display panel (such as drain electrode of thin film transistor (TFT))
Direction in opposite direction in panel) outgoing, then it is changed into right-hand circular polarization in face of light direction of propagation observation left circularly polarized light
Light, the right-circularly polarized light are changed into polarization direction and absorption axiss PP identical linearly polarized lights after first passing through quarter-wave plate 22,
And polarization direction is absorbed by polaroid 21 completely with absorption axiss PP identicals linearly polarized light, can not be emitted to outside display panel,
Therefore rotatory polarization piece 20 has the function that to prevent glare.
Fig. 6 is the cross-sectional view of another display panel provided in an embodiment of the present invention, as shown in fig. 6, arrow
Direction represents the light direction of propagation, and display panel includes：Array base palte 10, polaroid 21 and the protective cover plate being cascading
30.Protective cover plate 30 has the function that to protect display panel from mechanical damage, and protection during touch control operation is carried out to display panel
Cover plate 30 can contact with finger.Multiple fingerprint identification units 40 are located at polaroid 21 away from the side of protective cover plate 30.Fingerprint is known
Other light source 60 is located at the end face S1 sides of display panel, and the end face S1 of display panel is a plane perpendicular to display panel,
Fingerprint recognition light source 60 sends directional light.The directional light that fingerprint recognition light source 60 is sent is to be approximately perpendicular to the end face of display panel
S1 mode is incident, specifically, can be incident from array base palte 10, and its incident angle is θ3, refraction angle θ4, array base palte
10 refractive index is n4, can be obtained according to refractive index formula：nair·sinθ3=n4·sinθ4.Array base palte 10 is away from polarisation
The side surface of piece 21 1 and protective cover plate 30 are d away from the distance between side surface of polaroid 21 1, multiple fingerprint identification units 40
In the distance between a fingerprint identification unit 40 closest with the end face S1 of display panel and the end face S1 of display panel be
L1, a fingerprint identification unit 40 farthest with the end face S1 distances of display panel and display panel in multiple fingerprint identification units 40
The distance between end face S1 be L2, θ4Meet：Now entering in protective cover plate 30
The interface that light is penetrated in protective cover plate 30 and air (opening position of the paddy of corresponding fingerprint) glancing incidence and is totally reflected everywhere,
θ1Meet：88°<θ1<90°.It is understood that because accompanying drawing length size limits, only with two fingerprint identification units in Fig. 6
Illustrate and come L1 and L2, real product includes multiple fingerprint identification units.
Fig. 7 is a kind of index path that is totally reflected in the interface of protective cover plate and air of linearly polarized light, with reference to Fig. 6 with
Shown in Fig. 7, the electric field of linearly polarized light is E1, and electric field E1, s axle, p axles are coplanar, and the electric field E1 of linearly polarized light is in s axles and p direction of principal axis
Upper to have parallel component Ep and horizontal component Es, s axle perpendicular to the plane of incidence (paper), linearly polarized light is in protective cover plate and air
Interface be totally reflected after phase difference between parallel component Ep and horizontal component EsMeet：
Wherein
Incident ray glancing incidence and when being totally reflected at the interface of protective cover plate 30 and air, parallel point after reflection
Measure the phase difference between Ep and horizontal component EsMeet：Wherein l is positive integer.Then reflection light is linear polarization
Elliptically polarized light under light, rather than usual condition, and the linearly polarized light after being totally reflected can disappear nondestructively by polaroid 21
Except polaroid is to the decrease effect of fingerprint reflected light (fingerprint signal), the accuracy of fingerprint recognition is improved.Need what is illustrated
It is that being explained property illustrates so that fingerprint recognition light source is located at the end face side of display panel as an example in Fig. 7, in other embodiment party
In formula, the different ends for being located at display panel respectively with multiple fingerprint recognition light sources can be set, the present invention is not limited this
It is fixed.
The embodiment of the present invention additionally provides a kind of display device, and Fig. 8 is a kind of display device provided in an embodiment of the present invention
Structural representation, as shown in figure 8, display device provided in an embodiment of the present invention 100 include any embodiment of the present invention described in
Display panel, it can be mobile phone as shown in Figure 8, or computer, television set, Intelligent worn device etc., this reality
Example is applied to be not particularly limited this.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust, be combined with each other and substitute without departing from protection scope of the present invention.Therefore, although by above example to this
Invention is described in further detail, but the present invention is not limited only to above example, is not departing from present inventive concept
In the case of, other more equivalent embodiments can also be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
- A kind of 1. display panel, it is characterised in that including：Array base palte, polaroid and the protective cover plate being cascading；Multiple fingerprint identification units, positioned at the polaroid away from the protective cover plate side；Fresnel prism, positioned at the array base palte away from the protective cover plate side；Fingerprint recognition light source, sent positioned at the Fresnel prism away from the protective cover plate side, the fingerprint recognition light source Directional light；The Fresnel prism has a bottom surface parallel with the polaroid, and the directional light that the fingerprint recognition light source is sent is vertical It is incident in the incidence surface of the Fresnel prism；The incident direction for the directional light that the fingerprint recognition light source is sent and the polarisation The normal of plane where piece forms the plane of incidence, and the plane of incidence and direction where the absorption axiss of the polaroid are perpendicular or parallel.
- 2. display panel according to claim 1, it is characterised in that the refractive index of the protective cover plate is n1, the luxuriant and rich with fragrance alunite The refractive index of ear prism is n2；The directional light that the fingerprint recognition light source is sent incides the protective cover plate away from the array The incidence angle of the side surface of substrate one is θ1；The directional light that the fingerprint recognition light source is sent incides the bottom of the Fresnel prism The incidence angle in face is θ2；θ1And θ2Meet：<mrow> <msub> <mi>&theta;</mi> <mn>1</mn> </msub> <mo>&GreaterEqual;</mo> <mi>arcsin</mi> <mrow> <mo>(</mo> <mfrac> <mn>1</mn> <msub> <mi>n</mi> <mn>1</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>,</mo> </mrow><mrow> <msub> <mi>&theta;</mi> <mn>2</mn> </msub> <mo>=</mo> <mi>arcsin</mi> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>n</mi> <mn>1</mn> </msub> <mo>&CenterDot;</mo> <msub> <mi>sin&theta;</mi> <mn>1</mn> </msub> </mrow> <msub> <mi>n</mi> <mn>2</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
- 3. display panel according to claim 2, it is characterised in that the Fresnel prism is prism, the Rhizoma Sparganii The section of mirror is isosceles triangle, and the drift angle of isosceles triangle is Meet：
- 4. display panel according to claim 2, it is characterised in that n1=n2。
- 5. display panel according to claim 1, it is characterised in that the display panel also includes quarter-wave plate, The quarter-wave plate is located at the polaroid away from the protective cover plate side, and the quarter-wave plate with it is described partially Mating plate forms rotatory polarization piece.
- 6. display panel according to claim 1, it is characterised in that the protective cover plate is attached at by liquid optical cement Surface of the polaroid away from the array base palte side.
- 7. display panel according to claim 1, it is characterised in that the multiple fingerprint identification unit is located at the array Side of the substrate away from the polaroid.
- 8. display panel according to claim 1, it is characterised in that the display panel also includes first substrate, described First substrate between the array base palte and the Fresnel prism, and the multiple fingerprint identification unit be integrated in it is described Surface of the first substrate away from the Fresnel prism side.
- 9. display panel according to claim 8, it is characterised in that the first substrate and Fresnel prism one Shaping.
- 10. a kind of display device, it is characterised in that including the display panel described in claim any one of 1-9.
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