CN106940488A - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN106940488A
CN106940488A CN201710287809.0A CN201710287809A CN106940488A CN 106940488 A CN106940488 A CN 106940488A CN 201710287809 A CN201710287809 A CN 201710287809A CN 106940488 A CN106940488 A CN 106940488A
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CN
China
Prior art keywords
substrate
light
display panel
black matrix
tft
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
Application number
CN201710287809.0A
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Chinese (zh)
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CN106940488B (en
Inventor
张卿
曾洋
王丽花
杨康
丁洪
杜凌霄
谢亮
柴慧平
姚绮君
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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Priority to CN201710287809.0A priority Critical patent/CN106940488B/en
Publication of CN106940488A publication Critical patent/CN106940488A/en
Application granted granted Critical
Publication of CN106940488B publication Critical patent/CN106940488B/en
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133357—Planarisation layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • G02F1/13685—Top gates

Abstract

The embodiment of the invention discloses a kind of display panel and display device, the display panel includes：Display module, display module includes first substrate and multiple image element circuits, first substrate includes viewing area and the non-display area around viewing area, multiple image element circuits are located in the viewing area of first substrate, image element circuit includes multiple thin film transistor (TFT)s, and thin film transistor (TFT) includes grid, source electrode and drain electrode；Fingerprint recognition module, the formation of fingerprint recognition module is in first substrate in the viewing area of thin film transistor (TFT) side；And at least one layer of black matrix, black matrix is located between thin film transistor (TFT) and fingerprint recognition module, black matrix includes shading region and the open region between shading region, and the projection of the grid of thin film transistor (TFT), source electrode and drain electrode on the first substrate is located in the projection of shading region on the first substrate.The purpose for improving display panel fingerprint recognition precision can be reached using the embodiment of the present invention.

Description

Display panel and display device
Technical field
The present embodiments relate to Display Technique, 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 occur in that a variety of display devices with fingerprint identification function, such as mobile phone, panel computer and intelligent wearable device.This Sample, user need to only use the fingerprint sensor of finger touch display unit before display device of the operation with fingerprint identification function, Authority Verification is can be carried out, Authority Verification process is simplified.
In the existing display device with fingerprint identification function, if fingerprint sensor is directly arranged at into display panel In viewing area, because the grid of thin film transistor (TFT), source electrode and drain electrode use metal more in image element circuit in display panel viewing area Material makes, for the fingerprint recognition module with backlight, the light irradiation sent when fingerprint recognition module group backlight source Into image element circuit after the grid of thin film transistor (TFT), source electrode and drain electrode, it may occur that reflect to form reflected light, the reflected light formed It is injected into the fingerprint sensor in fingerprint recognition module.Because the reflected light is not reflected to form by fingerprint, it enters finger After line sensor, noise is formed, the accuracy of fingerprint sensor fingerprint recognition is influenceed.
The content of the invention
The present invention provides a kind of display panel and display device, and fingerprint recognition module fingerprint recognition precision is improved to realize Purpose.
In a first aspect, the embodiments of the invention provide display panel, the display panel includes：
Display module, the display module includes first substrate and multiple image element circuits, and the first substrate includes display Region and the non-display area around the viewing area, the multiple image element circuit are located at the described aobvious of the first substrate Show in region, the image element circuit includes multiple thin film transistor (TFT)s, the thin film transistor (TFT) includes grid, source electrode and drain electrode；
Fingerprint recognition module, the fingerprint recognition module formation deviates from the thin film transistor (TFT) side in the first substrate Viewing area in；
And at least one layer of black matrix, the black matrix be located at the thin film transistor (TFT) and the fingerprint recognition module it Between, the black matrix include shading region and the open region between the shading region, the grid of the thin film transistor (TFT), The projection of the source electrode and the drain electrode on the first substrate is located at projection of the shading region on the first substrate It is interior.
Second aspect, the embodiments of the invention provide a kind of display device, the display device is carried including the embodiment of the present invention Any one display panel supplied.
The embodiment of the present invention is set by setting black matrix between the thin film transistor (TFT) and the fingerprint recognition module The black matrix is put including shading region and the open region between the shading region, the grid of the thin film transistor (TFT), The projection of the source electrode and the drain electrode on the first substrate is located at projection of the shading region on the first substrate It is interior, the light from the source outgoing of fingerprint recognition module group backlight is blocked using the shading region of black matrix, light is reduced in thin film transistor (TFT) The grid, the source electrode and the drain electrode on the reflected light that is formed, solve in existing display panel because in pixel electricity The reflected light formed in road at the grid of thin film transistor (TFT), source electrode and drain electrode is injected into the fingerprint sensor of fingerprint recognition module In, cause the noise of the fingerprint sensor of fingerprint recognition module excessive, influence the accuracy of fingerprint recognition module fingerprint recognition Problem, realizes the purpose for improving fingerprint recognition module fingerprint recognition precision.
Brief description of the drawings
Fig. 1 a are a kind of dimensional structure diagram of display panel provided in an embodiment of the present invention；
Fig. 1 b are the cross-sectional view of the A1-A2 along along Fig. 1 a；
Fig. 2 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 3 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 4 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 5 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 6 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 7 is the structural representation of another display panel provided in an embodiment of the present invention；
Fig. 8 a are the overlooking the structure diagram of another display panel provided in an embodiment of the present invention；
Fig. 8 b are the cross-sectional view of the C1-C2 along along Fig. 8 a；
Fig. 9 a are a kind of circuit diagram of fingerprint sensor in fingerprint recognition module；
Fig. 9 b are the cross-sectional view of fingerprint sensor in fingerprint recognition module；
Figure 10 is that fingerprint recognition module carries out fingerprint recognition fundamental diagram；
Figure 11 is the structural representation of another display panel provided in an embodiment of the present invention；
Figure 12 a are the light path schematic diagram before the light that backlight provided in an embodiment of the present invention is sent is reflected by touch main body；
Figure 12 b are the light path schematic diagram after the light that backlight provided in an embodiment of the present invention is sent is reflected by touch main body；
Figure 13 a are that the fingerprint noise light that backlight provided in an embodiment of the present invention is sent is illustrated by the light path before metallic reflection Figure；
Figure 13 b are that the fingerprint noise light that backlight provided in an embodiment of the present invention is sent is illustrated by the light path after metallic reflection Figure；
Figure 14 is the structural representation of another display panel provided in an embodiment of the present invention；
Figure 15 a are the overlooking the structure diagram of another display panel provided in an embodiment of the present invention；
Figure 15 b are the cross-sectional view in the M1-M2 directions along along Figure 15 a；
Figure 16 a limit the overlooking the structure diagram of film for a kind of angle provided in an embodiment of the present invention；
Figure 16 b are the cross-sectional view of the E1-E2 along along Figure 16 a；
Figure 16 c limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention；
Figure 17 a are the overlooking the structure diagram that another angle provided in an embodiment of the present invention limits film；
Figure 17 b are the cross-sectional view of the F1-F2 along along Figure 17 a；
Figure 17 c limit the structural representation of film for another angle provided in an embodiment of the present invention；
Figure 18 a limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention；
Figure 18 b are the cross-sectional view of the bearing of trend of optical fiber structure along along Figure 18 a；
Figure 18 c are the geometrical relationship figure for the diffusion length that angle shown in Figure 18 a limits film；
Figure 19 a limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention；
Figure 19 b are the cross-sectional view of the G1-G2 along along Figure 19 a；
Figure 20 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.
Everyone including the skin lines including fingerprint on pattern, breakpoint and crosspoint it is different, present uniqueness And it is constant throughout one's life.Accordingly, we can be mapped a people with his fingerprint, by by his fingerprint and pre-saving Finger print data is compared, to verify his true identity, here it is fingerprint identification technology.Have benefited from electronics Integrated-manufacturing Techniques With it is quick and optical finger print identification technology has begun to enter into our daily life in reliable algorithm research, fingerprint identification technology It is living, it is most deep as being studied in current biological detection, it is most widely used, develop most ripe technology.Optical finger print recognizes skill The operation principle of art is that the light that light source is sent in display panel is irradiated in touch main body (such as finger), handles digital reflex shape Into reflected light, the reflected light formed (i.e. fingerprint signal light) is transmitted into fingerprint sensor, and fingerprint sensor is to inciding it On optical signal be acquired.Due to there is specific lines on fingerprint, intensity of reflected light difference is formed in finger position, Finally so that each sensor is different by the optical signal collected, user real identification can be determined accordingly.
Fig. 1 a are a kind of dimensional structure diagram of display panel provided in an embodiment of the present invention, and Fig. 1 b are along along Fig. 1 a A1-A2 cross-sectional view.Referring to Fig. 1 a and Fig. 1 b, the display panel includes display module 10, fingerprint recognition module 20 And at least one layer of black matrix 30.Display module 10 includes first substrate 11 and multiple image element circuits 12.First substrate 11 includes Viewing area 111 and the non-display area 112 around viewing area 111, multiple image element circuits 12 are located at first substrate 11 In viewing area 111, image element circuit 12 includes multiple thin film transistor (TFT)s (not shown in Fig. 1 a and Fig. 1 b), thin film transistor (TFT) bag Include grid, source electrode and drain electrode.Fingerprint recognition module 20 is formed (is contained in image element circuit in first substrate 11 away from thin film transistor (TFT) In 12) in the viewing area 111 of side.Black matrix 30 is located at thin film transistor (TFT) (being contained in image element circuit 12) and fingerprint recognition Between module 20, black matrix 30 includes shading region 31 and the open region 32 between shading region 31, and thin film transistor (TFT) (is included In in image element circuit 12) projection on first substrate 11 of grid, source electrode and drain electrode be located at shading region 31 in first substrate 11 On projection in.
The embodiment of the present invention sets black matrix by setting black matrix between thin film transistor (TFT) and fingerprint recognition module Open region including shading region and between shading region, the grid of thin film transistor (TFT), source electrode and drain electrode are on the first substrate Projection is located in the projection of shading region on the first substrate, it is possible to use block from fingerprint recognition module the shading region of black matrix The light of outgoing, reduces the reflected light that the light is formed on the grid, source electrode and drain electrode of thin film transistor (TFT), and reduction is brilliant in film The reflected light formed at grid, source electrode and the drain electrode of body pipe incides the possibility in fingerprint recognition module, and then reduces because being somebody's turn to do Part reflected light incides the noise formed after fingerprint recognition module.Open region is set in black matrix in addition, can allow from The light of outgoing is passed through from open region in fingerprint recognition module, is irradiated to user and is pressed against on the finger of the display panel, and permits Perhaps the reflected light reflected to form by finger print is passed through from open region.Raising fingerprint recognition module can be reached by so setting Signal to noise ratio, improves the purpose of fingerprint recognition module fingerprint recognition precision.
Alternatively, the material of the shading region 31 of black matrix 30 can be that color is that the metal of black, color are having for black Machine material or the material doped with black pigment.Because these materials to the absorbability of light preferably, be conducive to absorbing from What fingerprint recognition module 20 was sent, the light on the shading region 31 of black matrix 30 is irradiated to, can further be reduced in film crystal The reflected light formed at grid, source electrode and the drain electrode of pipe incides the possibility in fingerprint recognition module 20, improves fingerprint recognition The fingerprint recognition precision of module 20.Typically, the material of the shading region 31 of black matrix 30 can be chromium.
It should be noted that in Figure 1b, black matrix 30 is arranged between first substrate 11 and fingerprint recognition module 20, This is only the specific example of the present invention, rather than limitation of the present invention.Alternatively, as shown in Fig. 2 black matrix 30 is set In thin film transistor (TFT) (being contained in image element circuit 12) between first substrate 11.Or, as shown in figure 3, display panel includes Two layers of black matrix 30, wherein first layer black matrix 301 are arranged at thin film transistor (TFT) (being contained in image element circuit 12) and the first base Between plate 11, second layer black matrix 302 is arranged between first substrate 11 and fingerprint recognition module 20.
, can be according to market needs in specific make, settings first substrate 11 is rigid substrates, be, for example, it is quartzy or Glass material, or it is flexible base board, e.g. polyimide material to set first substrate 11.Below with regard to typical display panel Structure is described in detail, but listed example is designed solely for the purpose of illustration the present invention, is not limitation of the invention.
Fig. 4 is the structural representation of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 4, this shows Show that first substrate 11 is rigid substrates in panel；Black matrix 30 is arranged at thin film transistor (TFT) (being contained in image element circuit 12) and the Between one substrate 11；Display panel also includes the first planarization layer 13 and the second planarization layer 14；First planarization layer 13 is located at First substrate 11 is close to the surface of black matrix 30；Second planarization layer 14 (is contained in positioned at black matrix 30 close to thin film transistor (TFT) In image element circuit 12) surface, the opening of black matrix 30 is simultaneously filled in the shading region 31 of the second planarization layer 14 covering black matrix 30 Area 32.
The material of the first substrate 11 can be quartz or glass etc., and the first substrate 11 is used in follow-up image element circuit Provided a supporting role in the manufacturing process of the part such as 12 and luminescence unit.
In practice, due to the surface of first substrate 11 polish precision limitation and clean-up performance of first substrate 11 etc. because Element so that there is tiny flaw on first substrate 11.Here the purpose for setting the first planarization layer 13 is to fill the first base Tiny flaw on plate 11, plays the purpose on planarization first substrate 11 surface.
In view of during actual fabrication black matrix 30, plan sets the shading of black matrix 30 only on first substrate 11 The position depositional coating in area 31, the position of the open region 32 of plan setting black matrix 30 does not deposit any on first substrate 11 Film layer so that formed after black matrix 30, the shading region 31 of black matrix 30 and open region 32 have thickness difference.In follow-up make, structure The subregion of the related film layer of pixel circuit 12 can be trapped in the open region 32 of black matrix 30, caused in black matrix 30 Near open region 32, part component shift in image element circuit 12, this can make it that image element circuit 12 short circuit or open circuit occurs not Good phenomenon, influences the display effect of display panel.In the technical program, (it is contained in close to thin film transistor (TFT) in black matrix 30 In image element circuit 12) surface set the second planarization layer 14, and using the second planarization layer 14 cover black matrix 30 shading Area 31 simultaneously fills the purpose of open region 32 of black matrix 30 and is, in order to eliminate the shading region 31 of black matrix 30 and the open region of black matrix 30 32 thickness difference, prevents the bad phenomenon of part component shift in the image element circuit 12 of subsequent manufacturing processes formation, carries The yield of high display panel.Alternatively, the second planarization layer 14 can also be set to be only filled with the open region 32 of black matrix 30.
In specific make, the material of the first planarization layer 13 and the second planarization layer 14 can be any insulating materials. Because polyimides physical and chemical performance is stable, electrical insulating property is good, manufacture craft is simple, with low cost, alternatively, first is flat The material for changing the planarization layer 14 of layer 13 and second is polyimides.
Fig. 5 is the structural representation of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 5, this shows Show in panel, first substrate 11 is flexible base board；Black matrix 30 be arranged at thin film transistor (TFT) (being contained in image element circuit 12) with Between first substrate 11；Display panel also includes the first planarization layer 13, and the first planarization layer 13 is located at black matrix 30 close to thin Simultaneously fill the surface of film transistor (being contained in image element circuit 12), the shading region 31 of the first planarization layer 13 covering black matrix 30 The open region 32 of black matrix 30.
Similarly, in the technical program, black matrix 30 close to thin film transistor (TFT) (being contained in image element circuit 12) table Face sets the first planarization layer 13, and covers the shading region 31 of black matrix 30 using the first planarization layer 13 and fill black matrix 30 The purpose of open region 32 be, in order to eliminate the thickness difference of the shading region 31 of black matrix 30 and the open region 32 of black matrix 30, to prevent out The bad phenomenon of part component shift, improves the yield of display panel in the image element circuit 12 of existing subsequent manufacturing processes formation.
In specific make, the material of the planarization layer 13 of first substrate 11 and second can be any insulating materials.Due to Polyimides physical and chemical performance is stable, electrical insulating property is good, toughness is strong, and manufacture craft is simple, with low cost, alternatively, and first The material of the planarization layer 13 of substrate 11 and second is polyimides.
On the basis of above-mentioned technical proposal, in display panel, the thin film transistor (TFT) for constituting image element circuit 12 can be top Grid structure, or bottom grating structure.In specific make, it can be determined according to product demand.Just typical display below Panel construction is described in detail, but listed example is designed solely for the purpose of illustration the present invention, is not to the present invention's Limit.
Fig. 6 is the structural representation of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 6, this shows Showing exemplarily only includes a thin film transistor (TFT) 121 in panel pixel circuit.The thin film transistor (TFT) 121 is bottom grating structure, bag Include：Form the grid 1211 on first substrate 11；Form the first insulating barrier 1212 on grid 1211；Formed first Active layer 1213 on insulating barrier 1212；The source electrode 1214 formed on active layer 1213 and drain electrode 1215.
Fig. 7 is the structural representation of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 7, this shows Showing exemplarily only includes a thin film transistor (TFT) 121 in panel pixel circuit.The thin film transistor (TFT) 121 is top gate structure, bag Include：Form the active layer 1213 on first substrate 11；Form the first insulating barrier 1212 on active layer 1213；Formed the Grid 1211 on one insulating barrier 1212；Form the second insulating barrier 1216 on grid；Formed on the second insulating barrier 1216 Source electrode 1214 and drain electrode 1215.
In view of including being located at the luminous list that image element circuit deviates from first substrate side toward contact in existing display module Member, image element circuit is corresponded with luminescence unit.If the fingerprint of the directly incident fingerprint recognition module of the light that luminescence unit is sent It in sensor, can equally cause the fingerprint sensor noise of fingerprint recognition module excessive, influence fingerprint recognition module fingerprint recognition Accuracy.Alternatively, as is seen in fig. 6 or fig. 7, upright projection of the luminescence unit 15 on first substrate 11 is located at shading region In 31 upright projection on first substrate 11.So setting can block luminescence unit 15 using black matrix shading region 31 and send Edge by luminescence unit 15 point to the direction of fingerprint recognition module 20 propagation light, and then improve fingerprint recognition module noise Than improving the fingerprint recognition precision of display panel.
If it should be noted that the display panel be organic electroluminescence display panel, such as Fig. 6 or Fig. 7, the luminescence unit 15 can With the luminescent layer 153 including first electrode 151, second electrode 152 and between first electrode 151 and second electrode 152. Operationally, alternatively, first electrode 151 is anode, and second electrode 152 is negative electrode；Or first electrode 151 is negative electrode, the Two electrodes 152 are anode.If the display panel is liquid crystal display panel, the luminescence unit can be sub-pixel unit.
Fig. 8 a are the overlooking the structure diagram of another display panel provided in an embodiment of the present invention.Fig. 8 b are along along Fig. 8 a C1-C2 cross-sectional view.Specifically, referring to Fig. 8 a and Fig. 8 b, the fingerprint recognition module 20 includes：Second substrate 21, The fingerprint sensor 22 of the multiple discrete settings formed on second substrate 21, fingerprint sensor 22 is arranged at second substrate 21 and leaned on The side of nearly first substrate 11, upright projection of the fingerprint sensor 22 on first substrate 11 is at least partially disposed at black matrix 30 Open region 32 in upright projection on first substrate 11.The hanging down on first substrate 11 of fingerprint sensor 22 is set here Delivering directly shadow and being at least partially disposed at benefit of the open region 32 of black matrix 30 in the upright projection on first substrate 11 is, reduction because The screening effect for the light that 31 pairs of the shading region of black matrix 30 is reflected to form through user's finger fingerprint so that as far as possible many through user The light that finger print is reflected to form is incided in fingerprint sensor 22 through the open region 31 of black matrix 30, improves fingerprint sensing The signal to noise ratio of device 22.
Further, fingerprint recognition module 22 can also include backlight 23, and backlight 23 is arranged at second substrate 21 and carried on the back From the side of first substrate 11.Alternatively, backlight 23 is collimated light source or area source in fingerprint recognition module 20.With using face Light source is compared, and can weaken the light reflected to form through user's finger fingerprint using collimated light source between different fingerprint sensors Crosstalk, improve fingerprint recognition precision.But it is due to that collimated light source is often bigger than area source thickness, can be increased using collimated light source Plus the thickness of display panel.
Fig. 9 a are a kind of circuit diagram of fingerprint sensor in fingerprint recognition module, and Fig. 9 b are fingerprint biography in fingerprint recognition module The cross-sectional view of sensor.Specifically, referring to Fig. 9 a and Fig. 9 b, fingerprint sensor includes photodiode D, storage capacitance C (not shown in Fig. 9 b) and thin film transistor (TFT) T；Photodiode D positive pole D1 is electrically connected with storage capacitance C first electrode, Photodiode D negative pole D2 and storage capacitance C second electrode and thin film transistor (TFT) T drain electrode Td is electrically connected；Film is brilliant Body pipe T grid Tg is electrically connected with thread switching control Gate, and thin film transistor (TFT) T source electrode Ts and signal detection line Data are electrically connected Connect.
Figure 10 is that fingerprint recognition module carries out fingerprint recognition fundamental diagram.With reference to Fig. 9 a, Fig. 9 b and Figure 10 to referring to Line recognition principle is described in detail.Referring to Fig. 9 a, Fig. 9 b and Figure 10, in the fingerprint recognition stage, it is electrically connected with fingerprint sensor Thin film transistor (TFT) T conductings in the control of the driving chip (not shown in Fig. 9 a, Fig. 9 b and Figure 10) connect, fingerprint sensor 22. When user presses finger on a display panel, the light that backlight 23 is sent in fingerprint recognition module 20 is divided into two parts：One It is divided into light a, some light is passed through from open region 32, is irradiated on finger, and is reflected to form instead on the surface of finger print Penetrate light b；Another part is light c, and some light is irradiated on the shading region 31 of black matrix 30, and by the shading of black matrix 30 Area 31 absorbs.The reflected light b reflected to form through finger print is incided in fingerprint sensor 22, by the photosensitive of fingerprint sensor 22 Diode D is received, and converts thereof into current signal, and the current signal formed is transmitted to signal detection through thin film transistor (TFT) T Line Data.Because the ridge 41 being pressed against in the finger print of display panel is contacted with panel surface, paddy 42 not with display surface Plate surface is contacted, cause light be irradiated to fingerprint paddy 42 it is different with the reflectivity on ridge 41, and then cause fingerprint sensor 22 The reflected light b formed at the position of ridge 41 received is different with the reflected light b formed at the position of paddy 42 intensity, makes The current signal that is converted into of the reflected light b that is formed by the reflected light b that is formed in the position of ridge 41 and at the position of paddy 42 It is of different sizes.Fingerprint recognition can be carried out according to current signal size.
In above-mentioned each technical scheme, in order to prevent that display module 10 and fingerprint recognition module 20 from occurring relative displacement, and And in order to ensure that display panel has good light penetration.Alternatively, as shown in Figure 10, fingerprint recognition module 20 and first Substrate 11 is bonded by optical cement 50.The material of optical cement 50 can be acrylic based material and silicon systems material.
Further, it is contemplated that polaroid, which has, make it that the light for meeting specified conditions is passed through, while limitation is unsatisfactory for this Polaroid, can be applied in above-mentioned technical proposal, or polaroid is used alone by the effect that the light of specified conditions is passed through With using the performance of polaroid, improve fingerprint noise light (including the light without touching main body reflection that sends of luminescence unit and Reflected light reflected to form through thin film transistor (TFT) source electrode, drain and gate etc.) interference, improve signal to noise ratio, and then improve finger Line identification module recognizes the accuracy of fingerprint.
Exemplarily, the display panel, including：Display module, including first substrate and on first substrate first Polaroid, the exiting surface of display module is located at side of first polaroid away from first substrate；Fingerprint recognition module, positioned at first Side of the substrate away from the first polaroid, including fingerprint recognition layer and positioned at fingerprint recognition layer close to display module side second Polaroid；Backlight, positioned at the side of exiting surface of first polaroid away from display module；Fingerprint recognition layer is used for according to light source The light sent reflexes to the fingerprint signal light of the fingerprint recognition layer to carry out fingerprint recognition via touch main body.Wherein, One polaroid is engaged with the second polaroid, so as to be damaged by the fingerprint signal light of the first polaroid and the second polaroid without light intensity Consumption；Second polaroid is used for the light intensity for weakening fingerprint noise light, and fingerprint noise light is other light in addition to fingerprint signal light.
The embodiment of the present invention sets the by the first substrate in display module close to the side of display module exiting surface One polaroid, side of the first substrate away from the first polaroid is arranged at by fingerprint recognition module, and fingerprint recognition module has Fingerprint recognition layer and positioned at fingerprint recognition layer close to display module side the second polaroid, in the fingerprint recognition stage, positioned at the The light that the backlight of exiting surface side of one polaroid away from display module is sent, the touch main body (finger) through touch display screen Fingerprint signal light is formed after reflection.Now, the first polaroid and the second polaroid are engaged, and can make fingerprint signal light without light intensity Loss ground passes through the first polaroid and the second polaroid；Meanwhile, reached in the light (fingerprint noise light) without touching main body reflection Before fingerprint recognition layer, the light intensity that the second polaroid can be at least to fingerprint noise light weakens, thus, it is possible to improve fingerprint The interference of noise light, improves signal to noise ratio, and then improve the accuracy that fingerprint recognition module recognizes fingerprint.
Above-mentioned backlight is specifically arranged in side of the fingerprint recognition module away from display module.
Figure 11 is the structural representation of another display panel provided in an embodiment of the present invention.As shown in figure 11, this implementation The display panel of example may include：Display module 10, including first substrate 11 and the first polaroid on first substrate 11 041, the exiting surface of display module 10 is located at the first side of the polaroid 041 away from first substrate 11；Luminescence unit 15, positioned at Between one substrate 11 and the first polaroid 041, the light for producing display image；Fingerprint recognition module 20, positioned at first substrate 11 sides away from the first polaroid 041, including second substrate 21, positioned at second substrate 21 close to display module 10 it is how each finger Line sensor 22, positioned at fingerprint sensor 22 close to the side of display module 10 the second polaroid 042, and positioned at second substrate 21 deviate from the side of fingerprint sensor 22 backlight 23, the backlight 23 as fingerprint recognition module 20 light source.Fingerprint sensing The fingerprint signal light that light is formed via touching after main body reflection that device 22 is used to be sent according to backlight 23 carries out fingerprint recognition.
Optionally, luminescence unit 15 may include the luminous list that glow color is emitting red light unit, glow color is green Member and glow color are blue luminescence unit.Optionally, display panel includes viewing area, luminescence unit 15 and fingerprint sensing Device 22 is located in viewing area, thus, can realize fingerprint recognition in the viewing area of display panel.
It is used for the light for producing display image in view of above-mentioned luminescence unit 15, fingerprint recognition module is used as using backlight 23 20 light source, in the display stage, backlight 23 does not light, it is to avoid influence display effect, in fingerprint recognition stage, luminescence unit 15 Do not light, it is to avoid the light spilt by luminescence unit 15, and the light sent reaches fingerprint sensor 22 through touching after main body reflects, Fingerprint recognition is interfered.Therefore, based on such scheme, the display module 10 of the present embodiment also includes the second display driving electricity Road (not shown), for the display drive signals in fingerprint recognition stage, not output driving luminescence unit 15, in display rank Section, the detection drive signal that output driving backlight does not light.
Optionally, first polaroid 041 of the present embodiment may include that the first quarter-wave plate and the 3rd line of stacking are inclined Mating plate, the first quarter-wave plate is located at the 3rd line polarisation piece close to the side of luminescence unit 15；Second polaroid 042 may include The second quarter-wave plate and the 4th line polarisation piece of stacking, the second quarter-wave plate are located at the 4th line polarisation piece close to luminous The side of unit 15；
The material of first quarter-wave plate and the second quarter-wave plate is identical with thickness；
In face of the transmission direction of fingerprint signal light, with counterclockwise for positive direction, the optical axis direction of the first quarter-wave plate Angle between the polarization direction of the 3rd line polarisation piece is 45 °, and the optical axis direction of the second quarter-wave plate and the 4th line are inclined Angle between the polarization direction of mating plate is -45 °；Or first quarter-wave plate optical axis direction and the 3rd line polarisation piece Angle between polarization direction is -45 °, the polarization direction of the optical axis direction of the second quarter-wave plate and the 4th line polarisation piece it Between angle be 45 °.
It is exemplary, with face of the transmission direction of fingerprint signal light, with counterclockwise for positive direction, the first quarter-wave plate Optical axis direction and the 3rd line polarisation piece polarization direction between angle be 45 °, the optical axis direction of the second quarter-wave plate Angle between the polarization direction of the 4th line polarisation piece is to illustrate exemplified by -45 °, wherein, the first quarter-wave plate and The material of second quarter-wave plate is calcite, is made with the e axles of the first quarter-wave plate and the second quarter-wave plate For optical axis.Please continue to refer to Figure 11, solid arrow represents the light that backlight 23 sends to exiting surface and through touching main body reflection The light of the fingerprint signal light formed afterwards, dotted arrow represents light that backlight 23 sends through the metal in display module 10 (i.e. The source electrode of thin film transistor (TFT), drain electrode and grid in image element circuit in display module 10) reflection light.In fingerprint recognition rank Section, with reference to Figure 12 a, before the light that backlight 23 is sent is reflected by touch main body, in face of the transmission direction of the light, with counterclockwise for just Direction, the angle between the e direction of principal axis of the first quarter-wave plate 0111 and the polarization direction P of the 3rd line polarisation piece 0112 is- 45 °, the angle between the e direction of principal axis of the second quarter-wave plate 0221 and the polarization direction of the 4th line polarisation piece 0222 is 45 °. The natural light that backlight 23 is sent is passed through after the 4th line polarisation piece 0222, becomes the linear polarization that polarization direction is located at one or three quadrants Light, becomes left-handed circularly polarized light, then become by the first quarter-wave plate 0111 by the second quarter-wave plate 0221 Polarization direction is located at the linearly polarized light of two four-quadrants, and polarization direction is parallel with the polarization direction of the 3rd line polarisation piece 0112, because And keep constant by polarization state during the 3rd line polarisation piece 0112 again.With reference to Figure 12 b, the linearly polarized light reflects through touching main body Fingerprint signal light, and the linearly polarized light constant still for polarization direction are formed afterwards, but in face of the transmission direction of the fingerprint signal light, are referred to Line flashlight is the linearly polarized light that polarization direction is located at one or three quadrants；When fingerprint signal light is again by the 3rd line polarisation piece 0112 Polarization state and light intensity are constant, become left-handed circularly polarized light during by the first quarter-wave plate 0111 and light intensity is constant；Should When left-handed circularly polarized light is by the second quarter-wave plate 0221, become polarization direction positioned at two four-quadrants linearly polarized light and Light intensity is constant, most afterwards through the polarization direction fourth line polarisation piece 0222 parallel with the polarization direction of the linearly polarized light, output intensity Constant linearly polarized light.And fingerprint noise light of the light sent for backlight after metallic reflection, Figure 13 a are refer to, backlight The natural light that source 23 is sent is passed through after the 4th line polarisation piece 0222, becomes the linearly polarized light that polarization direction is located at one or three quadrants, Left-handed circularly polarized light is become by the second quarter-wave plate 0221, left-handed circularly polarized light becomes dextrorotation after metallic reflection Circularly polarized light；With reference to Figure 13 b, the circularly polarized light of dextrorotation becomes polarization direction position again by the second quarter-wave plate 0221 In the linearly polarized light of one or three quadrants, and polarization direction and the polarization direction of the 4th line polarisation piece 0222 are perpendicular, therefore fingerprint is made an uproar Acousto-optic can not be reached by the 4th line polarisation piece 0222 refers to fingerprint sensor 22.Therefore, the second polaroid can be completely eliminated by The fingerprint noise light of metallic reflection in display module, to improve signal to noise ratio.
Optionally, the display panel of the present embodiment is rigid display panel.Specifically, as shown in figure 11, first substrate 11 For the first glass substrate, display module 10 also includes the second glass substrate 17；Luminescence unit 15 is located at the He of the first glass substrate 11 Between second glass substrate 17, the first glass substrate 11 and the second glass substrate 17 are supported by support column 18, the first glass substrate 11 and second have the air gap between glass substrate 17, optionally, and the thickness of the air gap is 4 μm.Display panel also includes Cover plate 19, cover plate 19 can be attached at the first surface of the polaroid 041 away from the side of luminescence unit 15 by liquid optical cement, optional , the thickness of display module 10 is 1410 μm.In addition, the second polaroid 042 can be attached by optical cement layer (not shown) In first substrate 11, display module 10 and fingerprint recognition module 20 are fitted to together, display panel is constituted.
Figure 14 is the structural representation of another display panel provided in an embodiment of the present invention.The present embodiment and Figure 11 institutes Unlike corresponding embodiment, the display panel of the present embodiment is flexible display panels.Specifically, as shown in figure 14, first Substrate 11 is flexible base board, and display module 10 also includes thin-film encapsulation layer 16, to replace second glass substrate of above-described embodiment； Wherein, the covering of thin-film encapsulation layer 16 luminescence unit 15.
It should be noted that the optical axis direction of the quarter-wave plate shown in above-described embodiment corresponding Figure 12 a and Figure 12 b Only readily appreciated with the polarization direction of line polarisation piece, and in the embodiment of the present invention, the optical axis direction of the first quarter-wave plate and The optical axis direction of second quarter-wave plate without particular kind of relationship, the polarization direction of the 3rd line polarisation piece and the 4th line polarisation piece it is inclined Direction shake also without particular kind of relationship, only needs between the optical axis direction of the first quarter-wave plate and the polarization direction of the 3rd line polarisation piece Angle, and angle between the optical axis direction of the second quarter-wave plate and the polarization direction of the 4th line polarisation piece meets State the qualifications of embodiment.
Further, on the basis of above-mentioned technical proposal, can also positioned at display module and fingerprint recognition module it Between set up angle limit film, will via touch main body reflex in the light of fingerprint sensor elements, relative to angle limit The light that the incidence angle of film is more than the transmission angle that angle limits film is filtered.Wherein, angle limits film to limiting film perpendicular to angle The transmitance of incident light is A；The transmission angle that angle limits film refers to that light of the transmitance as kA limits film relative to angle Incidence angle；0<k<1.The benefit so set is further to improve the interference of fingerprint noise light, improves signal to noise ratio, Jin Erti High fingerprint recognition module recognizes the accuracy of fingerprint.
Specifically, Figure 15 a are the overlooking the structure diagram of another display panel provided in an embodiment of the present invention, Figure 15 b For the cross-sectional view in the M1-M2 directions along along Figure 15 a.With reference to Figure 15 a and Figure 15 b, display panel include display module 10, Fingerprint recognition module 20 and angle limit film 70.Wherein, display module 10 includes first substrate 11, and positioned at first substrate Multiple luminescence units 15 on 11, fingerprint recognition module 20 is located at viewing area of the first substrate 11 away from the side of luminescence unit 15 Interior, including second substrate 21, and at least one fingerprint sensor 22 on second substrate 21, angle limits film 70 and is located at Between display module 10 and fingerprint recognition module 20.
Fingerprint recognition module 20 can carry out fingerprint knowledge according to the light that fingerprint sensor 22 is reflexed to via touch main body Not, angle limits film 70 and will can then reflexed to via touch main body in the light of fingerprint sensor 22, is limited relative to angle The light that the incidence angle of film 70 is more than the transmission angle that angle limits film 70 is filtered.70 pairs of film can be limited with set angle perpendicular to angle Degree limits the transmitance of the incident light of film 70 as A, and the transmission angle that angle limits film 70 refers to that transmitance is relative as kA light The incidence angle of film 70, and 0 are limited in angle<k<1, the incidence angle for limiting film 70 relative to angle is more than angle and limits the saturating of film 70 Crossing the light at angle can be filtered by angle restriction film 70.Optionally, k can be set to be equal to the transmission that 0.1, i.e. angle limit film 70 Angle is the incidence angle that the light that transmitance is 0.1A limits film 70 relative to angle.
Optionally, fingerprint recognition module 20 can also include backlight 23, and backlight 23 is located at second substrate 21 away from finger The side of line sensor 22, the light that fingerprint sensor 22 can be sent according to backlight 23 is formed after being reflected via touch main body Fingerprint signal light is to carry out fingerprint recognition, such as light that the dotted line shown in Figure 15 b is represented.Angle limits film 70 and will can carried on the back What light source 23 was sent, reflexed to via main body is touched in the light of fingerprint sensor 22, relative to the incidence that angle limits film 70 The light that angle is more than the transmission angle that angle limits film 70 is filtered, to avoid the light of backlight 23 anti-via main body diverse location is touched The light penetrated exposes to the crosstalk phenomenon that same fingerprint sensor 22 is caused, and improves the accuracy and precision of fingerprint recognition.
Optionally, the light that backlight 23 is sent, the gap between adjacent two fingerprint sensor 22 exposes to touch Main body, light can be more than perpendicular to main body reflection, the transmitance for exposing to fingerprint sensor 22 via display module 10 is touched 10%.Specifically, if normal to the light of touch main body reflection, the saturating of fingerprint sensor 22 is exposed to via display module 10 Cross that rate is too small, then intensity when light reaches fingerprint sensor 22 is smaller, can influence the precision of fingerprint recognition.In addition, relative to The light that fingerprint sensor 22 is sent according to luminescence unit 15 carries out fingerprint recognition, and fingerprint sensor 22 is sent out according to backlight 23 The light gone out carries out fingerprint identification process, and the light that backlight 23 is sent reaches the process of fingerprint sensor 22, what light passed through Film layer is more, that is, the gross thickness for the film layer passed through is bigger, therefore light is perpendicular to main body reflection is touched, via display module 10 expose to fingerprint sensor 22 transmitance it is also bigger.
It should be noted that the embodiment of the present invention is not construed as limiting to the type of backlight 23, and can be spot light, can also It is area source, as long as ensureing that the light that backlight 23 is sent can be reflexed on fingerprint sensor 22 via main body is touched.
Figure 16 a limit the overlooking the structure diagram of film for a kind of angle provided in an embodiment of the present invention, and Figure 16 b are along figure E1-E2 cross-sectional view in 16a.With reference to Figure 16 a and Figure 16 b, angle limits film 70 including multiple parallel to the first base The place plane of plate 11, spaced light tight region 71 and transmission region 72 in the same direction, light tight region 71 is provided with Light absorbent.
Specifically, because light tight region 71 is provided with light absorbent, when light exposes to light tight region 71, meeting Absorbed by the light absorbent of light tight region 71, i.e., film 70 can not be limited by angle via the part light for touching main body reflection Expose on fingerprint sensor 22, angle, which limits film 70, can effectively filter out some light.As shown in fig 16b, due to irradiation Light to light tight region 71 can be absorbed by the light absorbent in the region, therefore the transmission angle of angle restriction film 70 meets as follows Formula：
Wherein, θ is the transmission angle that angle limits film 70, and p is the width of orientation of the transmission region 72 along transmission region 72 Degree, h is the thickness that angle limits film 70.As can be seen that θ, p and h are present from Figure 16 bCalculated relationship, therefore angle The transmission angle θ that degree limits film 70 meets above-mentioned formula.Because the light for exposing to light tight region 71 can be by the extinction in the region Material absorbs, therefore can be limited relative to the light that the incidence angle that angle limits film 70 is more than obtained by calculating through angle θ by angle Determine film 70 to filter, some light not carries out the detection light of fingerprint recognition needs, the setting that angle limits film 70 is also just kept away Exempt to expose to fingerprint sensor relative to the light that the incidence angle that angle limits film 70 is more than the transmission angle θ that angle limits film 70 On 22, the process to fingerprint recognition is interfered.
Optionally, when angle limits film 70 including multiple parallel to the place plane of first substrate 11, it is spaced in the same direction The light tight region 71 and transmission region 72 of arrangement, and light tight region 71 is when being provided with light absorbent, angle limits film 70 Diffusion length meets equation below：
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.Angle limits the expansion of film 70 Scattered distance refers to that the corresponding actually detected light of same fingerprint sensor 22 and Interference Detection light are anti-in touch-control main body The distance between exit point, the reflection light minimum relative to the incidence angle of fingerprint sensor 22 is actually detected light, relative to The incidence angle of fingerprint sensor 22, more than actually detected light relative to the incidence angle of fingerprint sensor 22 reflection light for interference Detect light.
Actually detected light can be approximated to be 0 ° relative to the incidence angle of fingerprint sensor 22, can limit film by angle It is minimum relative to the incidence angle of fingerprint sensor 22 that the transmission angle of film 70 can be limited for angle in 70 interference light, therefore In the presence of following calculated relationshipTherefore the diffusion length of angle restriction film 70 meets above-mentioned formula, angle The diffusion length for limiting film 70 is bigger, and the degree of accuracy of display panel progress fingerprint recognition and precision are lower.
Angle restriction film 70 is exemplarily arranged to one-dimentional structure, transmission region 72 and the edge of light tight region 71 by Figure 16 a Horizontal direction in Figure 16 a is spaced, and angle restriction film 70 can also be arranged into two-dimensional structure, as shown in figure 16 c, then thoroughly The diagonal that light region 72 and light tight region 71 can limit film 70 along angle shown in Figure 16 c is spaced, relative to The angle of one-dimentional structure limits film 70, and the angle of two-dimensional structure limits film 70 can be incident to angle restriction film 70 to all directions Light selectively filtered out.
Figure 17 a limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention, and Figure 17 b are edge F1-F2 cross-sectional view in Figure 17 a.With reference to Figure 17 a and Figure 17 b, angle, which limits film 70, includes loose structure 73, many The side wall 71 of pore structure 73 can absorb the light incided on side wall 71, i.e., some light can not expose to fingerprint sensor On 22.Exemplary, loose structure 73 can be glass capillary structure, and black suction can be coated on the side wall 71 of glass tubule Luminescent material so that side wall 71 can absorb the light incided on side wall 71, and then realize that angle limits film 70 to some light Filtering function.Optionally, light absorbent can be set between adjacent loose structure 73, light absorptive material can also be not provided with Material.
Specifically, because the side wall 71 of loose structure 73 can absorb the light incided on side wall 71, therefore, angle limit The transmission angle for determining film 70 meets equation below：
Wherein, θ is the transmission angle that angle limits film 70, and d is the diameter of loose structure 73, and h is the thickness that angle limits film 70 Degree.As can be seen that θ, d and h are present from Figure 17 bCalculated relationship, therefore angle limit film 70 transmission angle meet Above-mentioned formula.
Optionally, loose structure 73 is included when angle limits film 70, and the side wall 71 of loose structure 73 can absorb incidence During light on to side wall 71, the diffusion length that angle limits film 70 meets equation below：
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.The derivation of the formula It is similar with the derivation for the diffusion length that the angle of structure shown in Figure 16 a limits film 70, repeat no more here.Similarly, angle The diffusion length that degree limits film 70 is bigger, and the degree of accuracy of display panel progress fingerprint recognition and precision are lower.
It should be noted that the depression angle for limiting film 70 from angle says that corresponding loose structure 73 can be Figure 17 a institutes The circular configuration shown, corresponding can also be the regular hexagon structure shown in Figure 17 c, and the embodiment of the present invention is to loose structure 73 Shape is not construed as limiting.
Figure 18 a limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention.Such as Figure 18 a institutes Show, angle, which limits film 70, includes multiple optical fiber structures 74 arranged in the same direction, Figure 18 b are the optical fiber structure 74 along along Figure 18 a Bearing of trend cross-sectional view.With reference to Figure 18 a and Figure 18 b, optical fiber structure 74 includes inner core 741 and shell 742, often Be provided with light absorbent 743 between two adjacent optical fiber structures 74, then from optical fiber structure 74 appear to two optical fiber structures 74 it Between light can be absorbed by the light absorbent 743 between optical fiber structure 74, with realize angle limit film 70 to some light Filter effect.
Specifically, the inner core 741 of optical fiber structure 74 is different with the refractive index of shell 742, angle limits the transmission angle of film 70 Meet equation below：
Wherein, θ is the transmission angle that angle limits film 70, and during n is display module 10, the film that contacts of film 70 is limited with angle The refractive index of layer, ncoreFor the refractive index of the inner core 741 of optical fiber structure 74；ncladFor the refraction of the shell 742 of optical fiber structure 74 Rate.As shown in fig. 18b, when via the light for touching main body reflection, film 70 is limited relative to the angle that optical fiber structure 74 is constituted When incidence angle is more than θ, light will not be totally reflected in optical fiber structure 74, you can to pass optical fiber structure 74 by optical fiber structure Light absorbent 743 between 74 absorbs, and some light is that can limit film 70 by angle to filter, it is impossible to expose to fingerprint sensing On device 22, also it is achieved that angle limits the incidence angle that 70 pairs of film limits film 70 relative to angle, film 70 is limited more than angle Filtered through the light at angle, it is to avoid via the light for touching the reflection of main body diverse location expose to same fingerprint sensor 22 The crosstalk phenomenon caused, improves the accuracy and precision of fingerprint recognition.
Optionally, multiple optical fiber structures 74 arranged in the same direction are included when angle limits film 70, optical fiber structure 74 Inner core 741 is different with the refractive index of shell 742, and when being provided with light absorbent 743 between every two adjacent optical fiber structures 74, The diffusion length that angle limits film 70 meets equation below：
Δ X=Htan θ
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.Exemplary, such as Figure 18 c Shown, actually detected light can be approximated to be 0 ° relative to the incidence angle of fingerprint sensor 22, can limit film 70 by angle Interference light in, it is minimum relative to the incidence angle of fingerprint sensor 22 to limit the transmission angle of film 70 for angle, that is, The incidence angle critical value that light can be totally reflected in optical fiber structure 74, therefore there is following calculated relationshipSimilarly, the diffusion length that angle limits film 70 is bigger, display panel carries out the degree of accuracy and the essence of fingerprint recognition Degree is lower.
Figure 19 a limit the overlooking the structure diagram of film for another angle provided in an embodiment of the present invention, and Figure 19 b are edge G1-G2 cross-sectional view in Figure 19 a.With reference to Figure 19 a and Figure 19 b, angle limit film 70 include it is multiple in the same direction The column structure 75 of arrangement, column structure 75 includes inner core 751 and shell 752, and inner core 751 is identical with the refractive index of shell 752, Constituting the material of shell 752 includes light absorbent, then the light exposed to by inner core 751 on shell 352 can be by shell 752 Absorb, i.e., some light can not be exposed on fingerprint sensor 22.Optionally, it can be set between adjacent column structure 75 Light absorbent, can also be not provided with light absorptive material.
Specifically, the light exposed to by inner core 751 on shell 752 can be absorbed by shell 752, and therefore, angle limit The transmission angle for determining film 70 meets equation below：
Wherein, θ is the transmission angle that angle limits film 70, and D is the diameter of inner core 751, and h is the thickness that angle limits film 70. As can be seen that θ, D and h are present from Figure 19 bCalculated relationship, therefore angle limit film 70 transmission angle meet on State formula.
Optionally, multiple column structures 75 arranged in the same direction are included when angle limits film 70, column structure 75 is wrapped Inner core 751 and shell 752 are included, inner core 751 is identical with the refractive index of shell 752, constituting the material of shell 752 includes light absorbent When, the diffusion length that angle limits film 70 meets equation below：
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.The derivation of the formula It is similar with the derivation for the diffusion length that the angle of structure shown in Figure 16 a limits film 70, repeat no more here, similarly, angle The diffusion length that degree limits film 70 is bigger, and the degree of accuracy of display panel progress fingerprint recognition and precision are lower.
It should be noted that the depression angle for limiting film 70 from angle says that corresponding column structure 75 can be Figure 19 a institutes The circular configuration shown, it is corresponding can also other shapes structure, the embodiment of the present invention do not limited the shape of column structure 75 It is fixed.
Optionally, angle limits the diffusion length of film 70 less than 400 μm.The diffusion length that angle limits film 70 is bigger, does The distance disturbed between the pip of detection light and actually detected light on main body is touched is bigger, when actually detected light is with doing The distance between pip of the detection light on main body is touched is disturbed to be more than in fingerprint between paddy 42 and ridge 41 adjacent thereto Apart from when, can make it that mistake occurs in the fingerprint identification process of display panel, also can not just carry out the identification of fingerprint, have a strong impact on aobvious Show the degree of accuracy of panel fingerprint recognition.
Optionally, fingerprint recognition module 20 and angle can set optical cement layer between limiting film 70, for fingerprint to be known Other module 20 limits film 70 with angle and cohered.Optionally, fingerprint sensor 22 includes optical fingerprint sensor, optical finger print sensing Can be exemplary according to via the detection and identification for touching the light progress fingerprint that main body reflects, constitute fingerprint sensor 22 Material include the light absorptive such as non-crystalline silicon or GaAs or arsenones material or other light absorptive materials, the present invention Embodiment is not construed as limiting to the material for constituting fingerprint sensor 22.
The embodiment of the present invention limits film 70 by setting angle between display module 10 and fingerprint recognition module 20, and Angle restriction film 70 can be filtered to be reflexed in the light of fingerprint sensor 22 via touch main body, and film 70 is limited relative to angle Incidence angle be more than angle limit film 70 transmission angle light, i.e., angle limit film 70 setting can be to passing through in the prior art The light for reflexing to same fingerprint sensor 22 by touch main body diverse location is selectively filtered out, effectively prevent via The light for touching the reflection of main body diverse location exposes to the crosstalk phenomenon that same fingerprint sensor 22 is caused, and improves fingerprint recognition Accuracy and precision.
The embodiment of the present invention additionally provides a kind of display device.Figure 20 is a kind of display device provided in an embodiment of the present invention Structural representation.Referring to Figure 20, the display device 101 includes any one display panel 201 provided in an embodiment of the present invention. The display device 101 is specifically as follows mobile phone, panel computer and intelligent wearable device etc..
The embodiment of the present invention sets black matrix by setting black matrix between thin film transistor (TFT) and fingerprint recognition module Open region including shading region and between shading region, the grid of thin film transistor (TFT), source electrode and drain electrode are on the first substrate Projection is located in the projection of shading region on the first substrate, it is possible to use block from fingerprint recognition module the shading region of black matrix The light of outgoing, reduces the reflected light that the light is formed on the grid, source electrode and drain electrode of thin film transistor (TFT), and reduction is brilliant in film The reflected light formed at grid, source electrode and the drain electrode of body pipe incides the possibility in fingerprint recognition module, and then reduces because being somebody's turn to do Part reflected light incides the noise formed after fingerprint recognition module.Open region is set in black matrix in addition, can allow from The light of outgoing is passed through from open region in fingerprint recognition module, is irradiated to user and is pressed against on the finger of the display panel, and permits Perhaps the reflected light reflected to form by finger print is passed through from open region.Raising fingerprint recognition module can be reached by so setting Signal to noise ratio, improves the purpose of fingerprint recognition module fingerprint recognition precision.
Note, 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 it is various it is obvious change, Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also Other more Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (15)

1. a kind of display panel, it is characterised in that including：
Display module, the display module includes first substrate and multiple image element circuits, and the first substrate includes viewing area And the non-display area around the viewing area, the multiple image element circuit is positioned at the viewing area of the first substrate In domain, the image element circuit includes multiple thin film transistor (TFT)s, and the thin film transistor (TFT) includes grid, source electrode and drain electrode；
Fingerprint recognition module, the fingerprint recognition module formation is in the first substrate away from the aobvious of the thin film transistor (TFT) side Show in region；
And at least one layer of black matrix, the black matrix is located between the thin film transistor (TFT) and the fingerprint recognition module, institute Black matrix is stated including shading region and the open region between the shading region, it is the grid of the thin film transistor (TFT), described The projection of source electrode and the drain electrode on the first substrate is located at the shading region in the projection on the first substrate.
2. display panel according to claim 1, it is characterised in that
The black matrix is arranged between the thin film transistor (TFT) and the first substrate；And/or,
The black matrix is arranged between the first substrate and the fingerprint recognition module.
3. display panel according to claim 2, it is characterised in that
The first substrate is rigid substrates or flexible base board.
4. display panel according to claim 3, it is characterised in that
The first substrate is rigid substrates；
The black matrix is arranged between the thin film transistor (TFT) and the first substrate；
The display panel also includes the first planarization layer and the second planarization layer；
First planarization layer is located at the first substrate close to the surface of the black matrix；
Second planarization layer is located at the black matrix close to the surface of the thin film transistor (TFT), and second planarization layer covers Cover the shading region of the black matrix and fill the open region of the black matrix.
5. display panel according to claim 4, it is characterised in that first planarization layer and second planarization The material of layer is polyimides.
6. display panel according to claim 3, it is characterised in that
The first substrate is flexible base board；
The black matrix is arranged between the thin film transistor (TFT) and the first substrate；
The display panel also includes the first planarization layer, and first planarization layer is located at the black matrix close to the film The surface of transistor, first planarization layer covers the shading region of the black matrix and fills the open region of the black matrix.
7. display panel according to claim 6, it is characterised in that the first substrate and first planarization layer Material is polyimides.
8. display panel according to claim 1, it is characterised in that the thin film transistor (TFT) is bottom grating structure, including：
Form the grid on the first substrate；
Form the first insulating barrier on the grid；
Form the active layer on first insulating barrier；
The source electrode formed on the active layer and drain electrode.
9. display panel according to claim 1, it is characterised in that the thin film transistor (TFT) is top gate structure, including：
Form the active layer on the first substrate；
Form the first insulating barrier on the active layer；
Form the grid on first insulating barrier；
Form the second insulating barrier on the grid；
The source electrode formed on second insulating barrier and drain electrode.
10. display panel according to claim 1, it is characterised in that the display module also includes being located at the pixel Circuit deviates from the luminescence unit of the first substrate side；
The image element circuit is corresponded with the luminescence unit；
Upright projection of the luminescence unit on the first substrate is located at the shading region hanging down on the first substrate Deliver directly in shadow.
11. display panel according to claim 1, it is characterised in that
The fingerprint recognition module includes：
Second substrate,
Form the fingerprint sensor of multiple discrete settings on the second substrate, the fingerprint sensor is arranged at described the Two substrates are close to the side of the first substrate；
The open region that upright projection of the fingerprint sensor on the first substrate is at least partially disposed at the black matrix exists In upright projection on the first substrate.
12. display panel according to claim 11, it is characterised in that
The fingerprint recognition module also includes backlight, and the backlight is arranged at the second substrate away from the first substrate Side.
13. display panel according to claim 12, it is characterised in that
The backlight is collimated light source.
14. display panel according to claim 1, it is characterised in that
The fingerprint recognition module is bonded with the first substrate by optical cement.
15. a kind of display device, it is characterised in that including the display panel described in claim any one of 1-14.
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