CN109713003A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN109713003A CN109713003A CN201811612031.7A CN201811612031A CN109713003A CN 109713003 A CN109713003 A CN 109713003A CN 201811612031 A CN201811612031 A CN 201811612031A CN 109713003 A CN109713003 A CN 109713003A
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Abstract
The invention discloses a kind of display panel and display devices, belong to field of display technology, and display panel includes underlay substrate；Light shield layer, light shield layer are located at underlay substrate side, and light shield layer includes multiple light shielding parts；Reflective coating, reflective coating are located at light shield layer far from underlay substrate side, and reflective coating includes multiple reflecting parts；Photosensitive film layer, photosensitive film layer are located at reflective coating far from underlay substrate side, and photosensitive film layer includes multiple fingerprint identification units；Light shielding part is the first projection to the orthographic projection of underlay substrate, and reflecting part is the second projection to the orthographic projection of underlay substrate, and fingerprint identification unit is third projection to the orthographic projection of underlay substrate, and the first projection, the second projection, third projection three are overlapped mutually.Display device includes above-mentioned display panel.The present invention can increase the received luminous flux of fingerprint identification unit, promote the identification sensitivity of fingerprint identification unit, promote the fingerprint recognition effect of display panel.
Description
Technical field
The present invention relates to field of display technology, more particularly, to a kind of display panel and display device.
Background technique
In recent years, as mobile display product is universal, information security is paid close attention to by consumer.Fingerprint for everyone and
Speech is all come with body, with the development of science and technology, occurring a variety of display devices with fingerprint identification function, such as hand in the market
Machine, tablet computer and intelligent wearable device etc..User is before operating the display device with fingerprint identification function, it is only necessary to
It can be carried out Authority Verification with finger touch display unit, simplify Authority Verification process.Fingerprint recognition has uniqueness, difficult
With duplication, it is widely used in unlock, the payment affirmation of mobile display product.The existing display panel with fingerprint identification function
In, include multiple luminescence units and multiple fingerprint sensing units, fingerprint sensing unit can according to light source issue light via
The identification that the reflected light formed after main body reflection carries out fingerprint is touched to realize by the difference in reflectivity of fingerprint line paddy and wrinkle ridge
Fingerprint sensing unit receives different finger print information differentiation, forms fingerprint image.
The light that the fingerprint sensing unit of the prior art senses is the light through finger pressing reflection, but part reflected light
Fingerprint sensing unit can be penetrated, this part light quantity fingerprint sensing unit can not utilize, consequently, it is possible to reducing fingerprint sensing unit
The luminous flux received causes the reduction of fingerprint recognition sensitivity.
Therefore it provides a kind of light that can be made full use of through finger pressing reflection, increases fingerprint recognition fingerprint sensing
The luminous flux that unit receives, promoted fingerprint recognition sensitivity display panel and display device, be those skilled in the art urgently
Technical problem to be solved.
Summary of the invention
In view of this, the present invention provides a kind of display panels, comprising: underlay substrate；Light shield layer, light shield layer are located at substrate
Substrate side, light shield layer include multiple light shielding parts；Reflective coating, reflective coating are located at light shield layer far from underlay substrate side, instead
Penetrating film layer includes multiple reflecting parts；Photosensitive film layer, photosensitive film layer are located at reflective coating far from underlay substrate side, photosensitive film layer packet
Include multiple fingerprint identification units；Light shielding part is projected to the orthographic projection of underlay substrate for first, positive throwing of the reflecting part to underlay substrate
Shadow is the second projection, and fingerprint identification unit is third projection to the orthographic projection of underlay substrate, and first projects, second projects, third
Projection three is overlapped mutually.
Based on same idea, it to further include backlight mould that the present invention also provides a kind of display devices, including above-mentioned display panel
Group, backlight module are located at side of the underlay substrate far from light shield layer.
Compared with prior art, display panel provided by the invention and display device at least realize following beneficial effect
Fruit:
Display panel of the invention is by multiple light shielding parts on the direction perpendicular to underlay substrate and in photosensitive film layer
Multiple fingerprint identification units are corresponding, can block structure of the underlay substrate far from photosensitive film layer side and emit to fingerprint identification unit
Light, so as to avoid underlay substrate from bright identifying light to fingerprint identification unit far from what one side structure of photosensitive film layer generated
The influence of signal, improves the identification sensitivity of fingerprint identification unit, to promote the fingerprint recognition effect of display panel.The present invention
Display panel also by the reflective coating including multiple reflecting parts between photosensitive film layer and light shield layer, make multiple reflections
Portion is corresponding with multiple fingerprint identification units in photosensitive film layer on the direction perpendicular to underlay substrate, so as to so that through pressing
In the light of the line paddy wrinkle ridge reflection of the finger of display panel light-emitting surface, a part is absorbed by fingerprint identification unit, is generated
After light sensation electric current, another part light avoided to be absorbed through fingerprint identification unit by light shield layer, cause the same of certain luminous energy waste
When, it can also be received again by fingerprint identification unit after reflecting part reflects, increase the received luminous flux of fingerprint identification unit, mention
The identification sensitivity for rising fingerprint identification unit, so that the line paddy wrinkle ridge of the finger through pressing display panel light-emitting surface be made to reflect
Light be fully used, promote the fingerprint recognition effect of display panel.
Certainly, implementing any of the products of the present invention specific needs while must not reach all the above technical effect.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
It is combined in the description and the attached drawing for constituting part of specification shows the embodiment of the present invention, and even
With its explanation together principle for explaining the present invention.
Fig. 1 is a kind of the schematic diagram of the section structure of display panel provided in an embodiment of the present invention；
Fig. 2 is a kind of route map of the fingerprint recognition light of display panel sectional view provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention；
Fig. 6 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention；
Fig. 7 is a kind of planar structure schematic diagram of display panel provided in an embodiment of the present invention；
Fig. 8 is the pixel unit of Fig. 7 and the schematic diagram of the section structure of fingerprint identification unit；
Fig. 9 is the circuit diagram of fingerprint identification unit provided in an embodiment of the present invention；
Figure 10 is the pixel unit of Fig. 7 and another the schematic diagram of the section structure of fingerprint identification unit；
Figure 11 is the pixel unit of Fig. 7 and another the schematic diagram of the section structure of fingerprint identification unit；
Figure 12 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention；
Figure 13 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention；
Figure 14 is the A-A ' of Figure 13 to the schematic diagram of the section structure.
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should also be noted that unless in addition having
Body explanation, the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The range of invention.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Referring to FIG. 1, Fig. 1 is a kind of the schematic diagram of the section structure of display panel provided in an embodiment of the present invention (in order to clear
The technical solution of the present embodiment is illustrated by Chu, and Fig. 1 only illustrates the part film layer structure of display panel), provided in this embodiment one
Kind display panel, comprising: underlay substrate 10；Light shield layer 20, light shield layer 20 are located at 10 side of underlay substrate, and light shield layer 20 includes more
A light shielding part 201；
Reflective coating 30, reflective coating 30 are located at light shield layer 20 far from 10 side of underlay substrate, and reflective coating 30 includes more
A reflecting part 301；
Photosensitive film layer 40, photosensitive film layer 40 are located at reflective coating 30 far from 10 side of underlay substrate, and photosensitive film layer 40 includes
Multiple fingerprint identification units 401；
Light shielding part 201 is projected to the orthographic projection of underlay substrate 10 for first, orthographic projection of the reflecting part 301 to underlay substrate 10
For the second projection, fingerprint identification unit 401 is that third projects to the orthographic projection of underlay substrate 10, the first projection, second project, the
Three projection threes are overlapped mutually.
Specifically, the display panel of the present embodiment includes underlay substrate 10,10 side of underlay substrate is equipped with light shield layer 20,
Light shield layer 20 include multiple light shielding parts 201, multiple light shielding parts 201 on the direction perpendicular to underlay substrate 10 with photosensitive film layer 40
In multiple fingerprint identification units 401 it is corresponding, light shielding part 201 can block knot of the underlay substrate 10 far from 40 side of photosensitive film layer
Structure (optional, structure of the underlay substrate 10 far from 40 side of photosensitive film layer is the backlight module for including backlight) is to fingerprint recognition
The light that unit 401 emits, it is bright to finger so as to avoid underlay substrate 10 from generating far from 40 1 side structure of photosensitive film layer
Line recognition unit 401 identifies the influence of optical signal, the identification sensitivity of fingerprint identification unit 401 is improved, to promote display surface
The fingerprint recognition effect of plate.The display panel of the present embodiment further includes being located at reflection of the light shield layer 20 far from 10 side of underlay substrate
Film layer 30, for reflective coating 30 between photosensitive film layer 40 and light shield layer 20, reflective coating 30 includes multiple reflecting parts 301, more
A reflecting part 301 is corresponding with multiple fingerprint identification units 401 in photosensitive film layer 40 on the direction perpendicular to underlay substrate 10,
So as to so that a part is known by fingerprint in the light that the line paddy wrinkle ridge of the finger through pressing display panel light-emitting surface reflects
Other unit 401 absorbs, and after generating light sensation electric current, another part light is avoided to be inhaled through fingerprint identification unit 401 by light shield layer 20
While receiving, certain luminous energy is caused to waste, it can also be received, increase by fingerprint identification unit 401 again after the reflection of reflecting part 301
The received luminous flux of adding fingerprint recognition unit 401 promotes the identification sensitivity of fingerprint identification unit 401, to make to be pressed aobvious
Show that the light of the line paddy wrinkle ridge reflection of the finger of panel light-emitting surface is fully used, promotes the fingerprint recognition of display panel
Effect.The light shielding part 201 of the present embodiment is the first projection to the orthographic projection of underlay substrate 10, and reflecting part 301 is to underlay substrate 10
Orthographic projection be the second projection, fingerprint identification unit 401 is that third projects to the orthographic projection of underlay substrate 10, first is projected, the
Two projections, third projection three are overlapped mutually, so that the effect that light shielding part 201 shuts out the light can have both been promoted, it can also be further
The reflecting effect for increasing the light of 301 reflectance-transmittance fingerprint identification unit 401 of reflecting part, further increases fingerprint identification unit
401 identification sensitivity further promotes the fingerprint recognition effect of display panel.
It should be noted that Fig. 1 is only exemplary to draw the present embodiment for the technical solution of clear signal the present embodiment
The film layer structure of technical solution, but it is not limited only to the structure, display panel can also include other film layer (such as insulating layers, array
Layer, color film layer, buffer layer, planarization layer etc.), the present embodiment does not repeat.The present embodiment does not make the material of reflective coating 30
It is specific to limit, need to only meet can be more as far as possible the light L that will transmit through fingerprint identification unit 401 be reflected back fingerprint identification unit
401, when it is implemented, the selection of 30 material of reflective coating can be carried out according to practical reflection demand.The fingerprint of the present embodiment
Recognition unit 401 be by optical finger print identify technology carry out fingerprint recognition sensing, the present embodiment to its specific structure not
It limits, need to only meet can be anti-according to being formed after finger reflection of the light that light source issues via pressing display panel light-emitting surface
The identification that light carries out fingerprint is penetrated, by the reflected line difference of fingerprint line paddy and wrinkle ridge, realizes that fingerprint identification unit 401 receives not
With finger print information differentiation, fingerprint image is formed.
Optionally, it please refers to shown in Fig. 2, Fig. 2 is a kind of fingerprint of display panel sectional view provided in an embodiment of the present invention
Identify the route map of light, as shown in Figure 2, the display panel of the present embodiment can also include buffer layer 50 (being not filled by figure),
Array layer 60, color film layer 70, cover board 80, buffer layer 50 are located at side of the reflective coating 30 far from underlay substrate 10, array layer 60
Between buffer layer 50 and photosensitive film layer 40, color film layer 70 is located at side of the photosensitive film layer 40 far from underlay substrate 10, cover board
80 are located at side of the color film layer 70 far from underlay substrate 10, and the light L that the backlight of backlight module 00 issues is through pressing display surface
After the line paddy F1 wrinkle ridge F2 reflection of the finger F of plate light-emitting surface (i.e. cover board 80), a part of light L is inhaled by fingerprint identification unit 401
Receive, generate light sensation electric current, another part light L penetrate fingerprint identification unit 401 after through reflecting part 301 reflection after again by fingerprint
Recognition unit 401 receives, to increase the received luminous flux of fingerprint identification unit 401, improves fingerprint identification unit 401
It identifies sensitivity, so that the light L through fingerprint identification unit 401 is fully used, improve the fingerprint recognition of display panel
Effect.
In some optional embodiments, referring to FIG. 3, Fig. 3 is another display panel provided in an embodiment of the present invention
The schematic diagram of the section structure, in the present embodiment, the second projection covering third projection, first the second projection of projection covering.
The present embodiment further define the second projection covering third projection, i.e., reflecting part 301 to underlay substrate 10 just
The area of projection be greater than or equal to orthographic projection from fingerprint identification unit 401 to underlay substrate 10 area, so as to so that through
The light of fingerprint identification unit 401 can be more as far as possible fingerprint identification unit 401 is reflexed to by reflecting part 301 again, avoided portion
Light splitter because the frontal projected area of reflecting part 301 to underlay substrate 10 is too small cause light to leak out cannot be anti-by reflecting part 301
The phenomenon that penetrating, and being transmitted to 301 other film layers of lower section of reflecting part, conducive to the waste for avoiding light light quantity.The present embodiment is also into one
Step defines the second projection of the first projection covering, i.e., light shielding part 201 is greater than or equal to the area of the orthographic projection of underlay substrate 10
Orthographic projection from reflecting part 301 to underlay substrate 10 area, since the area of reflecting part 301 to the orthographic projection of underlay substrate 10 is big
In or equal to orthographic projection from fingerprint identification unit 401 to underlay substrate 10 area, so as to ensure light shielding part 201 to substrate
The area of the orthographic projection of substrate 10 is greater than or equal to the area of the orthographic projection of fingerprint identification unit 401 to underlay substrate 10 certainly,
Make light shielding part 201 that there is sufficiently large area to block structure (optional, substrate of the underlay substrate 10 far from 40 side of photosensitive film layer
Structure of the substrate 10 far from 40 side of photosensitive film layer is the backlight module for including backlight) emit to fingerprint identification unit 401
Light, so as to further avoid underlay substrate 10 far from 40 1 side structure of photosensitive film layer generate light to fingerprint recognition list
Member 401 identifies the influence of optical signal, further increases the identification sensitivity of fingerprint identification unit 401, and be more advantageous to promotion
The fingerprint recognition effect of display panel.
It should be noted that it is optional, as shown in figure 3, light shielding part 201 is greater than to the area of the orthographic projection of underlay substrate 10
Orthographic projection from reflecting part 301 to underlay substrate 10 area, orthographic projection from reflecting part 301 to underlay substrate 10 area be greater than refer to
Orthographic projection from line recognition unit 401 to underlay substrate 10 area；
Alternatively, as shown in figure 4, Fig. 4 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention,
Light shielding part 201 is equal to the area of the orthographic projection of reflecting part 301 to underlay substrate 10 to the area of the orthographic projection of underlay substrate 10
Equal to orthographic projection from fingerprint identification unit 401 to underlay substrate 10 area；
Alternatively, as shown in figure 5, Fig. 5 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention,
Light shielding part 201 is greater than the area of the orthographic projection of reflecting part 301 to underlay substrate 10 to the area of the orthographic projection of underlay substrate 10, instead
The area for penetrating the orthographic projection in portion 301 to underlay substrate 10 is equal to the face of the orthographic projection of fingerprint identification unit 401 to underlay substrate 10
Product；
Alternatively, as shown in fig. 6, Fig. 6 is the schematic diagram of the section structure of another display panel provided in an embodiment of the present invention,
Light shielding part 201 is equal to the area of the orthographic projection of reflecting part 301 to underlay substrate 10 to the area of the orthographic projection of underlay substrate 10, instead
The area for penetrating the orthographic projection in portion 301 to underlay substrate 10 is greater than the face of the orthographic projection of fingerprint identification unit 401 to underlay substrate 10
Product；Above-described embodiment can reach the identification sensitivity for further increasing fingerprint identification unit 401, and it is aobvious to be more advantageous to promotion
The effect for showing the fingerprint capacity of panel, will not repeat them here.
In some optional embodiments, Fig. 7 and Fig. 8 are please referred to, Fig. 7 is a kind of display panel provided in an embodiment of the present invention
(for the technical solution of clear signal the present embodiment, Fig. 7 only draws the flat of part display panel to 000 planar structure schematic diagram
Face structural schematic diagram), Fig. 8 is the pixel unit 600 of Fig. 7 and the schematic diagram of the section structure of fingerprint identification unit 401, the present embodiment
The array layer 60 of display panel 000 further include thin film transistor (TFT) 601, thin film transistor (TFT) 601 includes grid 6011, source electrode
6012, drain 6013, silicon island 6014, and 6014 place film layer of silicon island is located at side of the light shield layer 20 far from underlay substrate 10, grid
6011 place film layers are located at 6014 side of the place film layer far from underlay substrate 10 of silicon island, 6013 place films of source electrode 6012 and drain electrode
Layer be located at 6011 side of the place film layer far from underlay substrate 10 of grid, silicon island 6014 to the orthographic projection of underlay substrate 10 be the 4th
Projection, the 4th projection are overlapped mutually with the first projection；Thin film transistor (TFT) 601 is electrically connected with fingerprint identification unit 401.
The array layer 60 that the present embodiment has further explained display panel 000 further includes thin film transistor (TFT) 601, film
Transistor 601 includes grid 6011, source electrode 6012, drain electrode 6013, silicon island 6014, and 6014 place film layer of silicon island is located at light shield layer 20
Side far from underlay substrate 10,6011 place film layer of grid are located at one of 6014 place film layer of silicon island far from underlay substrate 10
Side, source electrode 6012 and 6013 place film layers of drain electrode are located at 6011 side of the place film layer far from underlay substrate 10 of grid, the film
Transistor 601 is for realizing the display function within the scope of the AA of display panel viewing area, optionally, as shown in fig. 7, display panel
Viewing area AA includes multi-strip scanning line G and multiple data lines S, and multi-strip scanning line G and multiple data lines S transposition insulator limit picture
Plain 600 region of unit, pixel unit 600 include thin film transistor (TFT) 601 and pixel electrode 602, and pixel electrode 602 passed through
Hole is electrically connected with the drain electrode 6013 of thin film transistor (TFT) 601, and the source electrode 6012 of thin film transistor (TFT) 601 is electrically connected with data line S, film
The grid 6011 of transistor 601 is electrically connected with scan line G.
It optionally, further include a plurality of finger scan line ZG please continue to refer to Fig. 7 and Fig. 8, the viewing area AA of display panel 000
With a plurality of fingerprint signal line ZS, a plurality of finger scan line ZG and a plurality of fingerprint signal line ZS transposition insulator limit fingerprint recognition list
First 401 regions, fingerprint identification unit 401 include the switching transistor 4011 and light sensing transistor 4012 of electrical connection, are opened the light
Transistor 4011 be included in 6011 same layer of grid D switch gate 40111, with the switch source 40112 of 6012 same layer of source electrode, with
The switch drain 40113 for 6013 same layers that drain, the switch silicon island 40114 with 6014 same layer of silicon island, switch gate 40111 and fingerprint
Scan line ZG electrical connection, switch source 40112 are electrically connected with a pole 221 of light sensing transistor 4012, switch drain 40113 and finger
Line signal wire ZS electrical connection.Further, referring to FIG. 9, Fig. 9 is the circuit of fingerprint identification unit provided in an embodiment of the present invention
Schematic diagram, for light sensing transistor 4012 for detecting light intensity magnitude, light sensing transistor 4012 is generated under the irradiation of different light intensity
Different size of photoelectric current generally uses transparent metal as its grid (being not filled by figure) to detect the light from top,
And output of the switching transistor 4011 as switch control photoelectric current, when switching transistor 4011 is opened, fingerprint identification unit
The 401 electric current identification signals generated can be transported to driving chip and be handled, and then obtain corresponding intensity signal, thus
To the image of fingerprint recognition.
It is the 4th projection that embodiment defines silicon island 6014 to the orthographic projection of underlay substrate 10, and the 4th projection is thrown with first
Shade is overlapping, and orthographic projection of the silicon island 6014 to underlay substrate 10 is overlapped mutually with light shielding part 201 to the orthographic projection of underlay substrate 10, can
Choosing, orthographic projection of the light shielding part 201 to the orthographic projection of underlay substrate 10 covering silicon island 6014 to underlay substrate 10, so as to logical
It crosses light shielding part 201 and blocks irradiation of the ambient to silicon island 6014, to avoid leakage current caused by light to thin film transistor (TFT)
The influence of 601 silicon island 6014；It can infer, light shielding part 201 is to the orthographic projection overlay switch silicon island 40114 of underlay substrate 10
Orthographic projection to underlay substrate 10 can achieve identical technical effect, and therefore not to repeat here.Film crystal in the present embodiment
Pipe 601 is electrically connected with fingerprint identification unit 401, refers to the thin film transistor (TFT) 601 of viewing area AA, fingerprint identification unit 401
The light sensing transistor 4012 of switching transistor 4011, fingerprint identification unit 401, three have electrical connection, so as to so that
While display panel reaches display function, has the function of fingerprint recognition.
It should be noted that Fig. 7 and Fig. 8 only illustrate part film layer structure for the structure of clear signal the present embodiment,
Cabling of other film layer structures (such as each insulating layer etc.) and non-display area not described to the present embodiment technical solution etc. is not
Mark signal, those skilled in the art carry out related understanding in combination with the basic structure of display panel in the prior art.
In some optional embodiments, please continue to refer to Fig. 1 and Fig. 2, the material of reflective coating 30 is gold in the present embodiment
Belong to any one of oxide or Au, Ag, Cu, the reflectivity of reflective coating 30 is greater than or equal to 40%.
The present embodiment further defines the material of reflective coating 30 as any in metal oxide or Au, Ag, Cu
Kind, Au, Ag, Cu, i.e. gold, silver, copper, being reflecting effect, good metal material Au, Ag, Cu is its chemical symbol, Au, Ag, Cu
Metal material it is not only reflexive good, conducive to the light reflected by the finger of pressing display panel light-emitting surface is sufficiently reflexed to fingerprint
Recognition unit 401, and oxidation resistance is high, is conducive to the service life for increasing display panel.Metal oxide refers to oxygen element
It is high reflectivity with the binary compound of another metallic chemical element composition, such as gold oxide, silver oxide, copper oxide
Oxide material.Also, the reflectivity that the present embodiment further illustrates reflective coating 30 is greater than or equal to 40%, that is, reflects
The material of film layer 30 is not limited to the above-mentioned metal oxide or Au, Ag, Cu being previously mentioned, can also be big for any other reflectivity
In or equal to 40% high reflection material, this implementation do not repeat.
In some optional embodiments, with continued reference to FIG. 1, in the present embodiment, 1 range of thickness d of reflective coating 30 is
60-130nm。
The present embodiment further defines reflective coating 30
60-130nm, due to the thickness effect reflecting effect of reflective coating 30, as the increase reflecting effect of reflective coating thickness is in first
The trend reduced after increase, therefore the thickness d 1 of reflective coating 30 is not relatively thin or thicker preferably, needs in 60-130nm
Between, so as to so that the reflecting effect of reflective coating 30 is preferable states.
In some optional embodiments, Fig. 7 and Figure 10 are please referred to, Figure 10 is the pixel unit 600 and fingerprint recognition list of Fig. 7
Another the schematic diagram of the section structure of member 401, in the present embodiment, each fingerprint identification unit 401 includes photodiode 4013,
Photodiode 4013 is including first electrode 40131, second electrode 40132 and is located at first electrode 40131 and second electrode
PN junction 40133 between 40132.
It includes photodiode 4013, photodiode that the present embodiment, which further illustrates each fingerprint identification unit 401,
4013 use as sensor devices, and for detecting light intensity magnitude, photodiode 4013 is generated under the irradiation of different light intensity
Different size of photoelectric current.Wherein, first electrode 40131, second electrode 40132 may respectively be the cathode of photodiode 4013
And anode, the PN junction 40133 (p-n junction) between first electrode 40131 and second electrode 40132 is electronics skill
Many elements in art, such as the material base of semiconductor diode, bipolar transistor, specifically side are doping to p-type
Semiconductor, the other side are doping to the component of N-type semiconductor.Photodiode 4013 works under backward voltage effect, no light
When extremely weak reverse current be known as dark current, there is the reverse current for increasing to tens microamperes when illumination to be rapidly known as photoelectric current, light
Strong variation causes the variation of reverse current, that is, converts optical signals to electric signal, to exist as optoelectronic sensor setting
In fingerprint identification unit 401, when photodiode 4013 is by illumination, the photon for carrying energy enters PN junction 40133, will
Amount passes to the bound electron on covalent bond, and bound electron energy increases to the constraint for shaking off covalent bond with regard to after to a certain degree, becomes
Photo-generated carrier, while electron hole pair is generated, carrier drifts about under backward voltage effect, so that reverse current
It increases rapidly, and its degree increased is directly proportional to light intensity.
It should be noted that the first electrode 40131 of the present embodiment can be one of anode or cathode, second electrode
40132 be the other of anode or cathode, and the present embodiment is not especially limited.
In some optional embodiments, please continue to refer to Fig. 7 and Figure 10, in the present embodiment, the material of photodiode 4013
Material is any one of amorphous silicon or polysilicon or two kinds of mixing.
The present embodiment further illustrate photodiode 4013 material be any one of amorphous silicon or polysilicon or
Two kinds of mixing, polysilicon (polycrystalline silicon) is a kind of form of elemental silicon, and torpescence under room temperature is high
Temperature is lower to react with oxygen, nitrogen, sulphur etc., under high temperature fused state, with biggish chemical activity, can make with substantially any material
With, have semiconductor property, be particularly important defect semiconductor material.When the elemental silicon of melting solidifies under the conditions of supercooling,
Silicon atom grows up to the different crystal grain of high preferred orientation at many nucleus, such as these nucleus with diamond lattice morphologic arrangement, then these
Crystal grain combines, and just crystallizes into polysilicon.Amorphous silicon (amorphous silicon α-Si), also known as amorphous silicon, and it is single
A kind of form of matter silicon, amorphous silicon are a kind of direct energy band semiconductors, and there are many so-called " dangling bonds " for its inside configuration, also
It is the electronics not with the silicon atom bonding of surrounding, these electronics can generate electric current under electric field action, not need sound
The help of son, thus the advantages of amorphous silicon can be made very thin, and there are also low manufacture costs.The photodiode 4013 of the present embodiment
Material can be only amorphous silicon, may also be only polysilicon, can also be constituted for the mixing material of amorphous silicon and polysilicon, this
Embodiment is not especially limited, when it is implemented, can be selected according to the actual situation.
In some optional embodiments, Fig. 7 and Figure 11 are please referred to, Figure 11 is the pixel unit 600 and fingerprint recognition list of Fig. 7
Another the schematic diagram of the section structure of member 401, in the present embodiment, photodiode 4013 includes along the side far from underlay substrate 10
To polycrystalline silicon membrane 90, the first amorphous silicon film layer 100, the second amorphous silicon film layer 110 for stacking gradually setting, polycrystalline silicon membrane 90
It is electrically connected with first electrode 40131, the second amorphous silicon film layer 110 is electrically connected with second electrode 40132.
The present embodiment is further illustrated when the mixing that the material of photodiode 4013 is amorphous silicon and polysilicon
Material constitute when, structure include along far from underlay substrate 10 direction stack gradually setting polycrystalline silicon membrane 90, first it is non-
Crystal silicon film layer 100, the second amorphous silicon film layer 110, polycrystalline silicon membrane 90 are electrically connected with first electrode 40131, the second amorphous silicon film
Layer 110 is electrically connected with second electrode 40132.In some optional embodiments, photodiode 4013 is based on LTPS processing procedure system
Make, be generally adopted by the p-i-n structure of lateral type, such structure can not accomplish that photosensitive film layer is made to have enough thickness to inhale
Income injects the light of fingerprint identification unit 401, thus 401 light sensitivity of fingerprint identification unit is poor, needs to use intense light source, and uses strong
Light source will lead to power consumption increase again, thus limit the p-i-n (postive-instrict- of the lateral type based on LTPS processing procedure
Negative) the actual availability of structure.
The present embodiment makes photodiode 4013 based on LTPS processing procedure, and mixed using stacked polysilicon and amorphous silicon
It is combined into, wherein polycrystalline silicon membrane 90 (6014 same layer of silicon island with thin film transistor (TFT) 601 in the AA of viewing area) is simultaneously as conductive
Layer is connect with first electrode 40131 (cathode), and the second amorphous silicon film layer 110 is with transparency conducting layer 120 (with pixel in the AA of viewing area
602 same layer of electrode) connection is subsequently connected to second electrode 40132 (anode), when the photodiode 4013 work it is reversed partially
When pressing (cathode connects positive potential, and anode connects negative potential) and giving the illumination of varying strength, reversed photoelectric current has light intensity good
Good responsiveness had both been able to satisfy the thickness of light sensation absorption, improved photoelectric current to illumination luminance sensitivity, and can have good two pole
Pipe characteristic.
In some optional embodiments, Figure 12 is please referred to, Figure 12 is another display panel provided in an embodiment of the present invention
The schematic diagram of the section structure, in the present embodiment, display panel further includes color membrane substrates 701, and color membrane substrates 701 are located at photosensitive film layer
40 sides far from underlay substrate 10；Color membrane substrates 701 include the color blocking 7012 of black matrix 7011 and multiple array arrangements, black square
Battle array 7011 is the 5th projection to the orthographic projection of underlay substrate 10, and the 5th projection is overlapped mutually with the second projection.
It further includes being located at side of the photosensitive film layer 40 far from underlay substrate 10 that the present embodiment, which further illustrates display panel,
Color membrane substrates 701, the color blocking of color membrane substrates 701 including black matrix 7011 (BM, black matrix) and multiple array arrangements
7012 (being not filled by figure), black matrix 7011 are deposited on the opaque portion between each color blocking (such as three primary colours R, G, B pattern)
Point, main function is to prevent backlight from leaking, and displays contrast to improve, prevents colour mixture, increase the purity of color.The present embodiment
Orthographic projection by from black matrix 7011 to underlay substrate 10 is set as overlapping to the orthographic projection of underlay substrate 10 with reflecting part 301, by
Be only used for reflecting in the reflecting part 301 of reflective coating 30, the position of display panel is not shown, can by black matrix 7011 to
The orthographic projection of underlay substrate 10 is set as overlapping to the orthographic projection of underlay substrate 10 with reflecting part 301, it is possible to reduce display panel
The not area of display area enhances display effect to improve the aperture opening ratio of display panel.
In some optional embodiments, with continued reference to FIG. 1, in the present embodiment, the thickness d 2 of photosensitive film layer 40 be less than or
Equal to 600nm.
The thickness d 2 that the present embodiment further defines photosensitive film layer 40 is less than or equal to 600nm, because penetrating for light is deep
Degree is related to the thickness of photosensitive film layer 40, and light will absorb identification by photosensitive film layer completely and require the thickness d 2 of photosensitive film layer 40 at least
Greater than 600nm, i.e., the phenomenon that light penetrates will appear for the photosensitive film layer 40 of thickness within 600nm, but thickness is greater than at present
The production of the photosensitive film layer 40 of 600nm is difficult to realize, therefore the thickness d 2 of the photosensitive film layer 40 made is generally less than or equal to
600nm, to make the line paddy wrinkle ridge of the finger through pressing display panel light-emitting surface reflect by setting reflective coating 30
In light, a part is absorbed by fingerprint identification unit 401, and after generating light sensation electric current, another part light penetrates fingerprint recognition list
Member 401 is received by fingerprint identification unit 401 again after the reflection of reflecting part 301, and it is logical to increase the received light of fingerprint identification unit 401
Amount promotes the identification sensitivity of fingerprint identification unit 401, to make the line paddy wrinkle ridge of the finger through pressing display panel light-emitting surface
The light of reflection is fully used, and the fingerprint recognition effect of display panel is promoted.
In some optional embodiments, with continued reference to FIG. 1, in the present embodiment, display panel be liquid crystal display panel or
Any one of organic light emitting display panel.
The present embodiment, which has further explained the display panel in above-described embodiment, can be liquid crystal display panel or have
Any one of machine light emitting display panel, it is that liquid crystal display panel is that the technical solution of above-described embodiment, which is only through display panel,
Example is schematically illustrated, and optionally, the display panel of the present embodiment can also be organic light emitting display panel.When it is implemented,
The structure of the present embodiment technical solution can be set according to different display panels, and therefore not to repeat here.
In some optional embodiments, Figure 13 and Figure 14 are please referred to, Figure 13 is a kind of display provided in an embodiment of the present invention
The structural schematic diagram of device 1111, Figure 14 are the A-A ' of Figure 13 to the schematic diagram of the section structure, display device provided in this embodiment
1111, it further include backlight module 00 including the display panel 000 that the above embodiment of the present invention provides, backlight module 00 is located at lining
Side of the substrate 10 far from light shield layer 20.Figure 13 embodiment only takes the mobile phone as an example, and is illustrated to display device 1111, can be with
Understand, display device 1111 provided in an embodiment of the present invention, can be other tools such as computer, TV, display device for mounting on vehicle
There is the display device 1111 of display function, the present invention is not specifically limited this.Display device provided in an embodiment of the present invention
1111, with display panel 000 provided in an embodiment of the present invention beneficial effect, specifically can with reference to the various embodiments described above for
Display panel 000 illustrates, and details are not described herein for the present embodiment.
Through the foregoing embodiment it is found that display panel provided by the invention and display device, at least realizing following has
Beneficial effect:
Display panel of the invention is by multiple light shielding parts on the direction perpendicular to underlay substrate and in photosensitive film layer
Multiple fingerprint identification units are corresponding, can block structure of the underlay substrate far from photosensitive film layer side and emit to fingerprint identification unit
Light, so as to avoid underlay substrate from bright identifying light to fingerprint identification unit far from what one side structure of photosensitive film layer generated
The influence of signal, improves the identification sensitivity of fingerprint identification unit, to promote the fingerprint recognition effect of display panel.The present invention
Display panel also by the reflective coating including multiple reflecting parts between photosensitive film layer and light shield layer, make multiple reflections
Portion is corresponding with multiple fingerprint identification units in photosensitive film layer on the direction perpendicular to underlay substrate, so as to so that through pressing
In the light of the line paddy wrinkle ridge reflection of the finger of display panel light-emitting surface, a part is absorbed by fingerprint identification unit, is generated
After light sensation electric current, another part light avoided to be absorbed through fingerprint identification unit by light shield layer, cause the same of certain luminous energy waste
When, it can also be received again by fingerprint identification unit after reflecting part reflects, increase the received luminous flux of fingerprint identification unit, mention
The identification sensitivity for rising fingerprint identification unit, so that the line paddy wrinkle ridge of the finger through pressing display panel light-emitting surface be made to reflect
Light be fully used, promote the fingerprint recognition effect of display panel.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that example above merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (12)
1. a kind of display panel characterized by comprising underlay substrate；Light shield layer, the light shield layer are located at the underlay substrate
Side, the light shield layer include multiple light shielding parts；
Reflective coating, the reflective coating are located at the light shield layer far from the underlay substrate side, and the reflective coating includes
Multiple reflecting parts；
Photosensitive film layer, the photosensitive film layer are located at the reflective coating far from the underlay substrate side, the photosensitive film layer packet
Include multiple fingerprint identification units；
The light shielding part is projected to the orthographic projection of the underlay substrate for first, positive throwing of the reflecting part to the underlay substrate
Shadow is the second projection, and the fingerprint identification unit is that third projects to the orthographic projection of the underlay substrate, first projection, institute
State the second projection, third projection three is overlapped mutually.
2. display panel according to claim 1, which is characterized in that second projection covers the third projection, institute
State the first projection covering second projection.
3. display panel according to claim 1, which is characterized in that it further include thin film transistor (TFT), the thin film transistor (TFT)
Including grid, source electrode, drain electrode, silicon island, film layer where the silicon island is located at side of the light shield layer far from the underlay substrate,
Side of the film layer far from the underlay substrate, the source electrode and the drain electrode where film layer is located at the silicon island where the grid
Side of the film layer far from the underlay substrate where place film layer is located at the grid, the silicon island to the underlay substrate just
It is projected as the 4th projection, the 4th projection is overlapped mutually with first projection；The thin film transistor (TFT) and the fingerprint recognition
Unit electrical connection.
4. display panel according to claim 1, which is characterized in that the material of the reflective coating be metal oxide or
The reflectivity of any one of person Au, Ag, Cu, the reflective coating are greater than or equal to 40%.
5. display panel according to claim 1, which is characterized in that the thickness range of the reflective coating is 60-
130nm。
6. display panel according to claim 1, which is characterized in that each fingerprint identification unit includes two pole of photoelectricity
Pipe, the photodiode include first electrode, the second electrode and be located at the first electrode and the second electrode
Between PN junction.
7. display panel according to claim 6, which is characterized in that
The material of the photodiode is any one of amorphous silicon or polysilicon or two kinds of mixing.
8. display panel according to claim 6, which is characterized in that the photodiode includes along far from the substrate
The direction of substrate stacks gradually the polycrystalline silicon membrane of setting, the first amorphous silicon film layer, the second amorphous silicon film layer, the polysilicon film
Layer is electrically connected with the first electrode, and second amorphous silicon film layer is electrically connected with the second electrode.
9. display panel according to claim 1, which is characterized in that further include color membrane substrates, the color membrane substrates are located at
Side of the photosensitive film layer far from the underlay substrate；The color membrane substrates include the color of black matrix and multiple array arrangements
Resistance, the black matrix are the 5th projection to the orthographic projection of the underlay substrate, and the 5th projection is intersected with second projection
It is folded.
10. display panel according to claim 1, which is characterized in that the thickness of the photosensitive film layer is less than or equal to
600nm。
11. display panel according to claim 1, which is characterized in that the display panel is liquid crystal display panel or has
Any one of machine light emitting display panel.
12. a kind of display device, which is characterized in that further include back including the described in any item display panels of claim 1-11
Optical mode group, the backlight module are located at side of the underlay substrate far from the light shield layer.
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| CN201811612031.7A CN109713003B (en) | 2018-12-27 | 2018-12-27 | Display panel and display device |
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