CN106940488B - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN106940488B
CN106940488B CN201710287809.0A CN201710287809A CN106940488B CN 106940488 B CN106940488 B CN 106940488B CN 201710287809 A CN201710287809 A CN 201710287809A CN 106940488 B CN106940488 B CN 106940488B
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CN
China
Prior art keywords
substrate
light
display panel
black matrix
tft
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CN201710287809.0A
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Chinese (zh)
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CN106940488A (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
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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 devices, the display panel includes: display module, display module includes first substrate and multiple pixel circuits, first substrate includes display area and the non-display area around display area, multiple pixel circuits are located in the display area of first substrate, pixel circuit includes multiple thin film transistor (TFT)s, and thin film transistor (TFT) includes grid, source electrode and drain electrode；Fingerprint recognition mould group, fingerprint recognition mould group are formed in first substrate in the display 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 mould group, black matrix includes shading region and the open region between shading region, and the grid of thin film transistor (TFT), the projection of source electrode and drain electrode on the first substrate are located in the projection of shading region on the first substrate.It can achieve the purpose for improving display panel fingerprint recognition precision using the embodiment of the present invention.

Description

Display panel and display device
Technical field
The present embodiments relate to display technology more particularly to a kind of display panel and display devices.
Background technique
It is unique since fingerprint is all to come for everyone with body.With the development of science and technology, market On there are a variety of display devices with fingerprint identification function, such as mobile phone, tablet computer and intelligent wearable device.This Sample, user need to only use the fingerprint sensor of finger touch display unit before operating the display device with fingerprint identification function, It can be carried out Authority Verification, simplify Authority Verification process.
In the existing display device with fingerprint identification function, if fingerprint sensor is directly arranged at display panel In viewing area, since the grid of thin film transistor (TFT), source electrode and drain electrode mostly use metal in pixel circuit in display panel viewing area Material production, for the fingerprint recognition mould group with backlight, when the light irradiation that fingerprint recognition module group backlight source issues Into pixel circuit after the grid of thin film transistor (TFT), source electrode and drain electrode, it may occur that reflect to form reflected light, be formed by reflected light It is injected into the fingerprint sensor in fingerprint recognition mould group.Since the reflected light is not reflected to form by fingerprint, finger is entered After line sensor, noise is formed, the accuracy of fingerprint sensor fingerprint recognition is influenced.
Summary of the invention
The present invention provides a kind of display panel and display device, improves fingerprint recognition mould group fingerprint recognition precision to realize Purpose.
In a first aspect, the embodiment of the invention provides display panel, which includes:
Display module, the display module include first substrate and multiple pixel circuits, and the first substrate includes display Region and non-display area around the display area, the multiple pixel circuit are located at the described aobvious of the first substrate Show in region, the pixel circuit includes multiple thin film transistor (TFT)s, and the thin film transistor (TFT) includes grid, source electrode and drain electrode；
Fingerprint recognition mould group, the fingerprint recognition mould group are formed in the first substrate away from the thin film transistor (TFT) side Display 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 mould group it Between, the black matrix includes 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 the projection of the shading region on the first substrate It is interior.
Second aspect, the embodiment of the invention provides a kind of display device, which includes that the embodiment of the present invention mentions Any one display panel supplied.
The embodiment of the present invention is set by the way that black matrix is arranged between the thin film transistor (TFT) and the fingerprint recognition mould group Setting the black matrix includes 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 the projection of the shading region on the first substrate It is interior, the light being emitted from fingerprint recognition module group backlight source is blocked using the shading region of black matrix, reduces light in thin film transistor (TFT) The grid, the reflected light that is formed in the source electrode and the drain electrode, solve in existing display panel because in pixel electricity The grid of thin film transistor (TFT) in road, the reflected light formed at source electrode and drain electrode are injected into the fingerprint sensor of fingerprint recognition mould group In, cause the noise of the fingerprint sensor of fingerprint recognition mould group excessive, influences the accuracy of fingerprint recognition mould group fingerprint recognition Problem realizes the purpose for improving fingerprint recognition mould group fingerprint recognition precision.
Detailed description of the invention
Fig. 1 a is a kind of schematic perspective view of display panel provided in an embodiment of the present invention；
Fig. 1 b is the schematic diagram of the section structure of the A1-A2 along Fig. 1 a；
Fig. 2 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Fig. 8 a is the overlooking structure diagram of another display panel provided in an embodiment of the present invention；
Fig. 8 b is the schematic diagram of the section structure of the C1-C2 along Fig. 8 a；
Fig. 9 a is a kind of circuit diagram of fingerprint sensor in fingerprint recognition mould group；
Fig. 9 b is the schematic diagram of the section structure of fingerprint sensor in fingerprint recognition mould group；
Figure 10 is that fingerprint recognition mould group carries out fingerprint recognition working principle diagram；
Figure 11 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Figure 12 a is the light path schematic diagram before the light that backlight provided in an embodiment of the present invention issues is reflected by touch main body；
Figure 12 b is the light path schematic diagram after the light that backlight provided in an embodiment of the present invention issues is reflected by touch main body；
Figure 13 a is that the fingerprint noise light that backlight provided in an embodiment of the present invention issues is illustrated by the optical path before metallic reflection Figure；
Figure 13 b is that the fingerprint noise light that backlight provided in an embodiment of the present invention issues is illustrated by the optical path after metallic reflection Figure；
Figure 14 is the structural schematic diagram of another display panel provided in an embodiment of the present invention；
Figure 15 a is the overlooking structure diagram of another display panel provided in an embodiment of the present invention；
Figure 15 b is the schematic diagram of the section structure in the direction M1-M2 along Figure 15 a；
Figure 16 a is the overlooking structure diagram that a kind of angle provided in an embodiment of the present invention limits film；
Figure 16 b is the schematic diagram of the section structure of the E1-E2 along Figure 16 a；
Figure 16 c is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film；
Figure 17 a is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film；
Figure 17 b is the schematic diagram of the section structure of the F1-F2 along Figure 17 a；
Figure 17 c is the structural schematic diagram that another angle provided in an embodiment of the present invention limits film；
Figure 18 a is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film；
Figure 18 b is the schematic diagram of the section structure of the extending direction of optical fiber structure along Figure 18 a；
Figure 18 c is the geometrical relationship figure for the diffusion length that angle shown in Figure 18 a limits film；
Figure 19 a is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film；
Figure 19 b is the schematic diagram of the section structure of the G1-G2 along Figure 19 a；
Figure 20 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention.
Specific 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 limiting the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Everyone skin lines including fingerprint is different on pattern, breakpoint and crosspoint, and uniqueness is presented 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, and to verify his true identity, here it is fingerprint identification technologies.Have benefited from electronics Integrated-manufacturing Techniques With quick and reliable algorithm research, optical fingerprint identification technology has begun the daily life for entering into us in fingerprint identification technology It is living, become and studies most deep, most widely used, the most mature technology of development in current biological detection.Optical finger print identifies skill The working principle of art, which is that the light that light source issues in display panel is irradiated to, to be touched on main body (such as finger), and digital reflex shape is handled It at reflected light, is formed by reflected light (i.e. fingerprint signal light) and is transmitted in fingerprint sensor, fingerprint sensor is to being incident on it On optical signal be acquired.Since there are specific lines on fingerprint, intensity of reflected light difference is formed in finger position, Finally make each sensor that the collected optical signal of institute is different, can determine user real identification accordingly.
Fig. 1 a is a kind of schematic perspective view of display panel provided in an embodiment of the present invention, and Fig. 1 b is along Fig. 1 a The schematic diagram of the section structure of A1-A2.Referring to Fig. 1 a and Fig. 1 b, which includes display module 10, fingerprint recognition mould group 20 And at least one layer of black matrix 30.Display module 10 includes first substrate 11 and multiple pixel circuits 12.First substrate 11 includes Display area 111 and non-display area 112 around display area 111, multiple pixel circuits 12 are located at first substrate 11 In display area 111, pixel circuit 12 includes multiple thin film transistor (TFT)s (being not shown in Fig. 1 a and Fig. 1 b), thin film transistor (TFT) packet Include grid, source electrode and drain electrode.Fingerprint recognition mould group 20 is formed in first substrate 11 and (is contained in pixel circuit away from thin film transistor (TFT) In 12) in the display area 111 of side.Black matrix 30 is located at thin film transistor (TFT) (being contained in pixel circuit 12) and fingerprint recognition Between mould group 20, black matrix 30 includes shading region 31 and the open region 32 between shading region 31, thin film transistor (TFT) (include In in pixel circuit 12) grid, projection of the source electrode and drain electrode on first substrate 11 be located at shading region 31 in first substrate 11 On projection in.
Black matrix is arranged by the way that black matrix is arranged between thin film transistor (TFT) and fingerprint recognition mould group in the embodiment of the present invention 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, and the shading region that can use black matrix is blocked from fingerprint recognition mould group The light of outgoing reduces the reflected light that the light is formed in the grid of thin film transistor (TFT), source electrode and drain electrode, reduces in film crystalline substance A possibility that reflected light formed at the grid of body pipe, source electrode and drain electrode is incident in fingerprint recognition mould group, and then reduce because of this Part reflected light is incident on the noise formed after fingerprint recognition mould group.In addition open region is set in black matrix, can permit from The light being emitted in fingerprint recognition mould group is passed through from open region, is irradiated to user's pressing on the finger of the display panel, and permit Perhaps it is passed through by the reflected light that finger print reflects to form from open region.Setting, which can achieve, in this way improves fingerprint recognition mould group Signal-to-noise ratio improves the purpose of fingerprint recognition mould group fingerprint recognition precision.
Optionally, the material of 30 shading region 31 of black matrix can be color be the metal of black, color is having for black Machine material or material doped with black pigment.Because these materials are preferable to the absorbability of light, be conducive to absorb from What fingerprint recognition mould group 20 issued, the light being irradiated on 30 shading region 31 of black matrix can be further decreased in film crystal A possibility that reflected light formed at the grid of pipe, source electrode and drain electrode is incident in fingerprint recognition mould group 20 improves fingerprint recognition 20 fingerprint recognition precision of mould group.Typically, the material of 30 shading region 31 of black matrix can be chromium.
It should be noted that in Figure 1b, black matrix 30 is set between first substrate 11 and fingerprint recognition mould group 20, This is only a specific example of the invention, rather than limitation of the present invention.Optionally, as shown in Fig. 2, black matrix 30 is arranged Between thin film transistor (TFT) (being contained in pixel circuit 12) and first substrate 11.Alternatively, as shown in figure 3, display panel includes Two layers of black matrix 30, wherein first layer black matrix 301 is set to thin film transistor (TFT) (being contained in pixel circuit 12) and the first base Between plate 11, second layer black matrix 302 is set between first substrate 11 and fingerprint recognition mould group 20.
, can be according to market needs in specific production, setting first substrate 11 is rigid substrates, it is e.g. quartzy or Glass material, or setting first substrate 11 are flexible base board, e.g. polyimide material.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 schematic diagram of another display panel provided in an embodiment of the present invention.Specifically, referring to fig. 4, this is aobvious Show that first substrate 11 is rigid substrates in panel；Black matrix 30 is set to thin film transistor (TFT) (being contained in pixel circuit 12) and the Between one substrate 11；Display panel further 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 located at black matrix 30 and (is contained in close to thin film transistor (TFT) In pixel 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., which is used in subsequent pixel circuit It is provided a supporting role in the manufacturing process of the components such as 12 and luminescence unit.
In practice, due to 11 clean-up performance of limitation and first substrate of 11 surface polishing precision of first substrate etc. because Element, so that there are tiny flaws on first substrate 11.Here the purpose that the first planarization layer 13 is arranged is to fill the first base Tiny flaw on plate 11 plays the purpose on planarization 11 surface of first substrate.
In view of during actual fabrication black matrix 30, only 30 shading of black matrix is arranged in plan 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 there are thickness differences for 30 shading region 31 of black matrix and open region 32 after forming black matrix 30.In subsequent production, structure The partial region of the related film layer of pixel circuit 12 can be trapped in the open region 32 of black matrix 30, be caused in black matrix 30 Near open region 32, part component shift in pixel circuit 12, this meeting is so that pixel circuit 12 short circuit or open circuit occurs not Good phenomenon influences the display effect of display panel.In the technical scheme, it (is contained in black matrix 30 close to thin film transistor (TFT) In pixel circuit 12) surface be arranged the second planarization layer 14, and using the second planarization layer 14 covering black matrix 30 shading The area 31 and purpose of open region 32 for filling black matrix 30 is, in order to eliminate 30 shading region 31 of black matrix and 30 open region of black matrix 32 thickness difference prevents the bad phenomenon of part component shift in the pixel circuit 12 of subsequent manufacturing processes formation, mentions The yield of high display panel.Optionally, the open region 32 that the second planarization layer 14 is only filled with black matrix 30 can also be set.
In specific production, the material of the first planarization layer 13 and the second planarization layer 14 can be any insulating materials. Since polyimides physical and chemical performance is stable, electrical insulating property is good, manufacture craft is simple, low in cost, optionally, first is flat The material for changing layer 13 and the second planarization layer 14 is polyimides.
Fig. 5 is the structural schematic diagram of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 5, this is aobvious Show in panel, first substrate 11 is flexible base board；Black matrix 30 be set to thin film transistor (TFT) (being contained in pixel circuit 12) with Between first substrate 11；Display panel further includes the first planarization layer 13, and the first planarization layer 13 is located at black matrix 30 close to thin The surface of film transistor (being contained in pixel circuit 12), the shading region 31 of the first planarization layer 13 covering black matrix 30 are simultaneously filled The open region 32 of black matrix 30.
Similarly, in the technical program, in black matrix 30 close to the table of thin film transistor (TFT) (being contained in pixel circuit 12) The first planarization layer 13 is arranged in face, and using the shading region 31 of the first planarization layer 13 covering black matrix 30 and fills black matrix 30 The purpose of open region 32 be, in order to eliminate the thickness difference of 30 open region 32 of 30 shading region 31 of black matrix and black matrix, to prevent out The bad phenomenon of part component shift, improves the yield of display panel in the pixel circuit 12 that existing subsequent manufacturing processes are formed.
In specific production, the material of first substrate 11 and the second planarization layer 13 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, low in cost, optionally, first The material of substrate 11 and the second planarization layer 13 is polyimides.
Based on the above technical solution, in display panel, the thin film transistor (TFT) for constituting pixel circuit 12 can be top Gate structure, or bottom grating structure.In specific production, 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 of the invention It limits.
Fig. 6 is the structural schematic diagram of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 6, this is aobvious Show illustratively only include a thin film transistor (TFT) 121 in panel pixel circuit.The thin film transistor (TFT) 121 is bottom grating structure, packet It includes: the grid 1211 being formed on first substrate 11；The first insulating layer 1212 being formed on grid 1211；It is formed in first Active layer 1213 on insulating layer 1212；The source electrode 1214 being formed on active layer 1213 and drain electrode 1215.
Fig. 7 is the structural schematic diagram of another display panel provided in an embodiment of the present invention.Specifically, referring to Fig. 7, this is aobvious Show illustratively only include a thin film transistor (TFT) 121 in panel pixel circuit.The thin film transistor (TFT) 121 is top gate structure, packet It includes: the active layer 1213 being formed on first substrate 11；The first insulating layer 1212 being formed on active layer 1213；It is formed in Grid 1211 on one insulating layer 1212；The second insulating layer 1216 being formed on grid；It is formed in second insulating layer 1216 Source electrode 1214 and drain electrode 1215.
In view of often further including the luminous list for deviating from first substrate side positioned at pixel circuit in existing display module Member, pixel circuit and luminescence unit correspond.If the fingerprint of the directly incident fingerprint recognition mould group of the light that luminescence unit issues It in sensor, can equally cause the fingerprint sensor noise of fingerprint recognition mould group excessive, influence fingerprint recognition mould group fingerprint recognition Accuracy.Optionally, 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 31 in the upright projection on first substrate 11.Setting can use black matrix shading region 31 and block the sending of luminescence unit 15 in this way Edge by luminescence unit 15 be directed toward 20 direction of fingerprint recognition mould group propagate light, and then improve fingerprint recognition mould group noise Than improving the fingerprint recognition precision of display panel.
It should be noted that if the display panel is organic light emitting display panel, such as Fig. 6 or Fig. 7, which can To include first electrode 151, second electrode 152 and the luminescent layer 153 between first electrode 151 and second electrode 152. At work, optionally, first electrode 151 is anode, and second electrode 152 is cathode；Or first electrode 151 is cathode, the Two electrodes 152 are anode.If the display panel is liquid crystal display panel, which can be sub-pixel unit.
Fig. 8 a is the overlooking structure diagram of another display panel provided in an embodiment of the present invention.Fig. 8 b is along Fig. 8 a The schematic diagram of the section structure of C1-C2.Specifically, referring to figs. 8a and 8b, which includes: the second substrate 21, It is formed in the fingerprint sensor 22 of multiple discrete settings in the second substrate 21, fingerprint sensor 22 is set to the second substrate 21 and leans on The side of nearly first substrate 11, upright projection of the fingerprint sensor 22 on first substrate 11 are at least partially disposed at black matrix 30 Open region 32 in the upright projection on first substrate 11.Here setting fingerprint sensor 22 hanging down on first substrate 11 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, reduce because The screening effect of the 31 pairs of light reflected to form through user's finger fingerprint in shading region of black matrix 30, so that more as far as possible through user The open region 31 that the light that finger print reflects to form passes through black matrix 30 is incident in fingerprint sensor 22, and fingerprint sensing is improved The signal-to-noise ratio of device 22.
Further, fingerprint recognition mould group 22 can also include backlight 23, and backlight 23 is set to the back of the second substrate 21 Side from first substrate 11.Optionally, backlight 23 is collimated light source or area source in fingerprint recognition mould group 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 the precision of fingerprint recognition.But since collimated light source is often bigger than area source thickness, it can be increased using collimated light source Add the thickness of display panel.
Fig. 9 a is a kind of circuit diagram of fingerprint sensor in fingerprint recognition mould group, and Fig. 9 b is that fingerprint passes in fingerprint recognition mould group The schematic diagram of the section structure of sensor.Specifically, referring to Fig. 9 a and Fig. 9 b, fingerprint sensor includes photodiode D, storage capacitance C (being not shown in Fig. 9 b) and thin film transistor (TFT) T；The positive D1 of photodiode D is electrically connected with the first electrode of storage capacitance C, The cathode D2 of photodiode D is electrically connected with the drain electrode Td of the second electrode of storage capacitance C and thin film transistor (TFT) T；Film is brilliant The grid Tg of body pipe T is electrically connected with thread switching control Gate, and the source electrode Ts and signal detection line Data of thin film transistor (TFT) T is electrically connected It connects.
Figure 10 is that fingerprint recognition mould group carries out fingerprint recognition working principle diagram.Below with reference to Fig. 9 a, Fig. 9 b and Figure 10 to finger Line recognition principle is described in detail.It is electrically connected in the fingerprint recognition stage with fingerprint sensor referring to Fig. 9 a, Fig. 9 b and Figure 10 The control of the driving chip (being not shown in Fig. 9 a, Fig. 9 b and Figure 10) connect, the thin film transistor (TFT) T conducting in fingerprint sensor 22. When user presses finger on a display panel, the light that backlight 23 issues in fingerprint recognition mould group 20 is divided into two parts: one It is divided into light a, which passes through from open region 32, is irradiated on finger, and formed instead in the surface reflection of finger print Penetrate light b；Another part is light c, which is irradiated on 30 shading region 31 of black matrix, and by the shading of black matrix 30 Area 31 absorbs.The reflected light b reflected to form through finger print is incident in fingerprint sensor 22, by the photosensitive of fingerprint sensor 22 Diode D is received, and converts thereof into current signal, is formed by current signal through thin film transistor (TFT) T and is transmitted to signal detection Line Data.Contacted due to pressing ridge 41 in the finger print of display panel with panel surface, paddy 42 not with display surface Plate surface contact, the paddy 42 for causing light to be irradiated to fingerprint is different with the reflectivity on ridge 41, and then causes fingerprint sensor 22 The reflected light b formed at the position of ridge 41 received is different with the intensity of the reflected light b formed at the position of paddy 42, makes Obtain the current signal by being converted into the reflected light b that the position of ridge 41 is formed and the reflected light b formed 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 solution, relative displacement occurs for display module 10 and fingerprint recognition mould group 20 in order to prevent, and And in order to guarantee that display panel has good light penetration.Optionally, as shown in Figure 10, fingerprint recognition mould group 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 has so that the light for meeting specified conditions penetrates, 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 penetrates With using polaroid performance, improve fingerprint noise light (including luminescence unit issue without touch main body reflection light and The reflected light etc. reflected to form through thin film transistor (TFT) source electrode, drain and gate) interference, improve signal-to-noise ratio, and then improve finger Line identifies the accuracy of mould group identification fingerprint.
Illustratively, the display panel, comprising: display module, first including first substrate and on first substrate The light-emitting surface of polaroid, display module is located at side of first polaroid far from first substrate；Fingerprint recognition mould group is located at first Side of the substrate far from the first polaroid, including fingerprint recognition layer and positioned at fingerprint recognition layer close to the second of display module side Polaroid；Backlight, the side of the light-emitting surface positioned at the first polaroid far from display module；Fingerprint recognition layer is used for according to light source The light of sending is reflected into the fingerprint signal light of the fingerprint recognition layer via main body is touched to carry out fingerprint recognition.Wherein, One polaroid is matched 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 to weaken the light intensity of fingerprint noise light, and fingerprint noise light is other light in addition to fingerprint signal light.
The embodiment of the present invention is by the first substrate in display module close to the side of display module light-emitting surface setting the Fingerprint recognition mould group is set to side of the first substrate far from the first polaroid by one polaroid, and fingerprint recognition mould group has Fingerprint recognition layer and positioned at fingerprint recognition layer close to the second polaroid of display module side, in the fingerprint recognition stage, be located at the The light that the backlight of light-emitting surface side of one polaroid far from display module issues, the touch main body (finger) through touch display screen Fingerprint signal light is formed after reflection.At this point, the first polaroid and the second polaroid match, fingerprint signal light can be made without light intensity Loss ground passes through the first polaroid and the second polaroid；Meanwhile it being reached in the light (fingerprint noise light) without touching main body reflection Before fingerprint recognition layer, the second polaroid can the light intensity at least to fingerprint noise light weaken, thus, it is possible to improve fingerprint The interference of noise light improves signal-to-noise ratio, and then improves the accuracy of fingerprint recognition mould group identification fingerprint.
Above-mentioned backlight is specifically set in side of the fingerprint recognition mould group far from display module.
Figure 11 is the structural schematic diagram of another display panel provided in an embodiment of the present invention.As shown in figure 11, this implementation The display panel of example can include: display module 10, the first polaroid including first substrate 11 and on first substrate 11 041, the light-emitting surface of display module 10 is located at the first side of the polaroid 041 far from first substrate 11；Luminescence unit 15 is located at the Between one substrate 11 and the first polaroid 041, for generating the light of display image；Fingerprint recognition mould group 20 is located at first substrate 11 sides far from the first polaroid 041, including the second substrate 21, positioned at the second substrate 21 close to how each finger of display module 10 Line sensor 22, positioned at fingerprint sensor 22 close to the second polaroid 042 of 10 side of display module, and be located at the second substrate 21 deviate from the backlight 23 of 22 side of fingerprint sensor, light source of the backlight 23 as fingerprint recognition mould group 20.Fingerprint sensing The light that device 22 is used to be issued according to backlight 23 carries out fingerprint recognition via the fingerprint signal light formed after main body reflection is touched.
Optionally, luminescence unit 15 may include the luminous list that luminescent color is emitting red light unit, luminescent color is green Member and luminescent color are the luminescence unit of blue.Optionally, display panel includes viewing area, luminescence unit 15 and fingerprint sensing Device 22 is located in viewing area, can realize fingerprint recognition in the viewing area of display panel as a result,.
In view of above-mentioned luminescence unit 15 is used to generate the light of display image, fingerprint recognition mould group is used as using backlight 23 20 light source, in the display stage, backlight 23 does not shine, and avoids influencing display effect, in the fingerprint recognition stage, luminescence unit 15 It does not shine, avoids the light leaked out by luminescence unit 15, and the light issued reaches fingerprint sensor 22 after touching main body and reflecting, Fingerprint recognition is interfered.Therefore, it is based on above scheme, the display module 10 of the present embodiment further includes the second display driving electricity Road (not shown), in the fingerprint recognition stage, the display drive signals of output driving luminescence unit 15, not to show rank Section, the detection driving signal that output driving backlight does not shine.
Optionally, first polaroid 041 of the present embodiment may include that the first quarter-wave plate being laminated and third line are inclined Mating plate, the first quarter-wave plate are located at third 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 third 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 third 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 °.
Illustratively, in face of the transmission direction of fingerprint signal light, with counterclockwise for positive direction, the first quarter-wave plate Optical axis direction and third 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 illustrated for being -45 °, wherein the first quarter-wave plate and The material of second quarter-wave plate is calcite, with the e axis of the first quarter-wave plate and the second quarter-wave plate work For optical axis.Please continue to refer to Figure 11, solid arrow indicates the light that backlight 23 is issued to light-emitting surface and is touched main body reflection The light of the fingerprint signal light formed afterwards, dotted arrow indicate backlight 23 issue light through the metal in display module 10 (i.e. The source electrode of thin film transistor (TFT), drain electrode and grid in pixel circuit in display module 10) reflection light.In fingerprint recognition rank Section, with reference to Figure 12 a, before the light that backlight 23 issues is reflected by touch main body, in face of the transmission direction of the light, to be positive counterclockwise Direction, the angle between the e axis direction of the first quarter-wave plate 0111 and the polarization direction P of third line polarisation piece 0112 is- 45 °, the angle between the e axis direction 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 issues is by becoming the linear polarization that polarization direction is located at a three quadrant after the 4th line polarisation piece 0222 Light becomes left-handed circularly polarized light by the second quarter-wave plate 0221, then is become by the first quarter-wave plate 0111 Polarization direction is located at the linearly polarized light of two four-quadrants, and polarization direction is parallel with the polarization direction of third line polarisation piece 0112, because And it is remained unchanged using polarization state when third line polarisation piece 0112.With reference to Figure 12 b, which reflects through touching main body Fingerprint signal light is formed afterwards, and is still the constant linearly polarized light in polarization direction, but in face of the transmission direction of the fingerprint signal light, is referred to Line signal light is the linearly polarized light that polarization direction is located at a three quadrant；When fingerprint signal light is again by third line polarisation piece 0112 Polarization state and light intensity are constant, by becoming left-handed circularly polarized light when the first quarter-wave plate 0111 and light intensity is constant；It should Left-handed circularly polarized light pass through the second quarter-wave plate 0221 when, become polarization direction be located at two four-quadrants linearly polarized light and Light intensity is constant, most the fourth line polarisation piece 0222 parallel with the polarization direction of the linearly polarized light through polarization direction afterwards, output intensity Constant linearly polarized light.And the fingerprint noise light for the light of backlight sending after metallic reflection, Figure 13 a is please referred to, backlight The natural light that source 23 issues is passed through after the 4th line polarisation piece 0222, and the linearly polarized light that polarization direction is located at a three quadrant is become, Become left-handed circularly polarized light 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 a three quadrant, 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 completely eliminate 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 further includes the second glass substrate 17；Luminescence unit 15 is located at 11 He of the first glass substrate 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 there are the air gaps between glass substrate 17, optionally, the air gap with a thickness of 4 μm.Display panel further includes Cover board 19, cover board 19 can be attached at the first surface of the polaroid 041 far from 15 side of luminescence unit by liquid optical cement, optional , display module 10 with a thickness of 1410 μm.In addition, the second polaroid 042 can be attached by optical adhesive layer (not shown) In first substrate 11, display module 10 and fingerprint recognition mould group 20 are fitted to together, display panel is formed.
Figure 14 is the structural schematic diagram of another display panel provided in an embodiment of the present invention.The present embodiment and Figure 11 institute 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 further includes thin-film encapsulation layer 16, to replace second glass substrate of above-described embodiment； Wherein, thin-film encapsulation layer 16 covers 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 be easy to understand 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 third 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 third line polarisation piece Angle and the second quarter-wave plate optical axis direction and the 4th line polarisation piece polarization direction between angle meet on State the qualifications of embodiment.
Further, based on the above technical solution, can also be located at display module and fingerprint recognition mould group it Between add angle limit film, will via touch main body be reflected into the light of fingerprint sensor elements, relative to angle limit The light through angle that the incidence angle of film is greater than angle restriction film filters out.Wherein, angle limits film and limits film to perpendicular to angle The transmitance of incident light is A；Angle limit film through angle refer to transmitance be the light of kA relative to angle limit film Incidence angle；0<k<1.The benefit being arranged in this way is further to improve the interference of fingerprint noise light, improves signal-to-noise ratio, Jin Erti The high accuracy of fingerprint recognition mould group identification fingerprint.
Specifically, Figure 15 a is the overlooking structure diagram of another display panel provided in an embodiment of the present invention, Figure 15 b For the schematic diagram of the section structure in the direction M1-M2 along Figure 15 a.In conjunction with Figure 15 a and Figure 15 b, display panel include display module 10, Fingerprint recognition mould group 20 and angle limit film 70.Wherein, display module 10 includes first substrate 11, and is located at first substrate Multiple luminescence units 15 on 11, fingerprint recognition mould group 20 are located at viewing area of the first substrate 11 far from 15 side of luminescence unit It is interior, including the second substrate 21, and at least one fingerprint sensor 22 in the second substrate 21, angle limit film 70 and be located at Between display module 10 and fingerprint recognition mould group 20.
Fingerprint recognition mould group 20 can be according to the light progress fingerprint knowledge for being reflected into fingerprint sensor 22 via main body is touched Not, angle limits film 70 and can will then be reflected into the light of fingerprint sensor 22 via touch main body, limits relative to angle The light through angle that the incidence angle of film 70 is greater than angle restriction film 70 filters out.Film 70 can be limited with set angle to perpendicular to angle Degree limits the transmitance of the light of the incidence of film 70 as A, and what angle limited film 70 refers to that transmitance is opposite as the light of kA through angle The incidence angle of film 70, and 0 < k < 1 are limited in angle, the incidence angle for limiting film 70 relative to angle is greater than the saturating of angle restriction film 70 The light for crossing angle can limit film 70 by angle and filter out.Optionally, k can be set and be equal to 0.1, the i.e. transmission of angle restriction film 70 Angle is the incidence angle that the light that transmitance is 0.1A limits film 70 relative to angle.
Optionally, fingerprint recognition mould group 20 can also include backlight 23, and backlight 23 is located at the second substrate 21 far from finger The side of line sensor 22, fingerprint sensor 22 are formed after capable of being reflected according to the light that backlight 23 issues via touch main body Fingerprint signal light is to carry out fingerprint recognition, such as the light that dotted line shown in Figure 15 b indicates.Angle limits film 70 and can will carry on the back What light source 23 issued, it is reflected into the light of fingerprint sensor 22 via main body is touched, the incidence of film 70 is limited relative to angle The light through angle that angle is greater than angle restriction film 70 filters out, anti-via main body different location is touched to avoid the light of backlight 23 The light penetrated exposes to crosstalk phenomenon caused by same fingerprint sensor 22, improves the accuracy and precision of fingerprint recognition.
Optionally, the light that backlight 23 issues, exposes to touch via the gap between adjacent two fingerprint sensor 22 Main body, light can be greater than perpendicular to main body reflection is touched via the transmitance that display module 10 exposes to fingerprint sensor 22 10%.Specifically, if exposing to the saturating of fingerprint sensor 22 via display module 10 perpendicular to the light for touching main body reflection Cross that rate is too small, then intensity when light reaches fingerprint sensor 22 is smaller, will affect the precision of fingerprint recognition.In addition, relative to Fingerprint sensor 22 carries out fingerprint recognition according to the light that luminescence unit 15 issues, and fingerprint sensor 22 is sent out according to backlight 23 Light out carries out fingerprint identification process, and the light that backlight 23 issues reaches the process of fingerprint sensor 22, what light passed through Film layer is more, that is, the overall thickness for the film layer passed through is bigger, therefore light is reflected perpendicular to main body 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 the type of backlight 23, point light source can be, it can also be with It is area source, as long as guaranteeing that the light that backlight 23 issues can reflex on fingerprint sensor 22 via main body is touched.
Figure 16 a is the overlooking structure diagram that a kind of angle provided in an embodiment of the present invention limits film, and Figure 16 b is along figure The schematic diagram of the section structure of E1-E2 in 16a.In conjunction with Figure 16 a and Figure 16 b, angle limits film 70 and is parallel to the first base including multiple 11 place plane of plate, spaced light tight region 71 and transmission region 72, light tight region 71 are provided in the same direction Light absorbent.
Specifically, since light tight region 71 is provided with light absorbent, when light exposes to light tight region 71, meeting It is absorbed by the light absorbent of light tight region 71, i.e., can not limit film 70 by angle via the part light for touching main body reflection It exposes 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 angle limits the as follows through angle satisfaction of film 70 Formula:
Wherein, θ is the angle that penetrates that angle limits film 70, and p is width of the transmission region 72 along the orientation of transmission region 72 Degree, h are the thickness that angle limits film 70.As can be seen that θ, p and h exist from Figure 16 bCalculated relationship, therefore angle The angle θ that penetrates that degree limits film 70 meets above-mentioned formula.Light due to exposing to light tight region 71 can be by the extinction in the region Material absorbs, therefore can be limited by angle relative to the light that the incidence angle that angle limits film 70 is greater than obtained by calculating through angle θ Determine film 70 to filter out, which is not the detection light for carrying out fingerprint recognition needs, and the setting that angle limits film 70 is also just kept away The incidence angle for having exempted to limit film 70 relative to angle exposes to fingerprint sensor greater than the light through angle θ of angle restriction film 70 On 22, the process of fingerprint recognition is interfered.
Optionally, it is parallel to 11 place plane of first substrate including multiple when angle limits film 70, be spaced in the same direction The light tight region 71 and transmission region 72 of arrangement, and when light tight region 71 is provided with light absorbent, angle limits film 70 Diffusion length meets following formula:
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.The expansion of angle restriction film 70 Scattered distance refers to that the corresponding actually detected light of the same fingerprint sensor 22 and Interference Detection light are anti-in touch-control main body The distance between exit point, the smallest reflection light of incidence angle relative to fingerprint sensor 22 are actually detected light, relative to The incidence angle of fingerprint sensor 22 is interfered greater than actually detected light relative to the reflection light of 22 incidence angle of fingerprint sensor 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 In 70 interference light, the incidence angle minimum relative to fingerprint sensor 22 can penetrate angle for angle restriction film 70, therefore There are following calculated relationshipsTherefore the diffusion length that angle limits film 70 meets above-mentioned formula, angle The diffusion length for limiting film 70 is bigger, and the accuracy of display panel progress fingerprint recognition and precision are lower.
Angle restriction film 70 is illustratively arranged to one-dimentional structure, 71 edge of transmission region 72 and light tight region by Figure 16 a Horizontal direction in Figure 16 a is alternatively arranged, and angle can also be limited film 70 and is arranged to two-dimensional structure, as shown in figure 16 c, then thoroughly Light region 72 and light tight region 71 can be alternatively arranged along the diagonal that angle shown in Figure 16 c limits film 70, 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 is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film, and Figure 17 b is edge The schematic diagram of the section structure of F1-F2 in Figure 17 a.In conjunction with Figure 17 a and Figure 17 b, it includes porous structure 73 that angle, which limits film 70, more The side wall 71 of pore structure 73 can absorb the light being incident on side wall 71, i.e., some light can not expose to fingerprint sensor On 22.Illustratively, porous structure 73 can be glass capillary structure, and black suction can be coated on the side wall 71 of glass tubule Luminescent material enables side wall 71 to absorb the light being incident on side wall 71, and then realizes that angle limits film 70 to some light Filtering function.Optionally, light absorbent can be set between adjacent porous structure 73, light absorptive material can also be not provided with Material.
Specifically, the side wall 71 due to porous structure 73 can absorb the light being incident on side wall 71, angle limit That determines film 70 meets following formula through angle:
Wherein, θ is the angle that penetrates that angle limits film 70, and d is the diameter of porous structure 73, and h is the thickness that angle limits film 70 Degree.As can be seen that θ, d and h exist from Figure 17 bCalculated relationship, therefore angle limit film 70 through angle meet Above-mentioned formula.
It optionally, include porous structure 73 when angle limits film 70, and the side wall 71 of porous structure 73 can absorb incidence When light on to side wall 71, the diffusion length that angle limits film 70 meets following formula:
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.The derivation process of the formula Similar with the angle of structure shown in Figure 16 a restriction derivation process of diffusion length of film 70, which is not described herein again.Likewise, angle The diffusion length that degree limits film 70 is bigger, and the accuracy of display panel progress fingerprint recognition and precision are lower.
It should be noted that saying that porous structure 73 is corresponding to can be Figure 17 a institute from the depression angle that angle limits film 70 The circular configuration shown, corresponding to be also possible to regular hexagon structure shown in Figure 17 c, the embodiment of the present invention is to porous structure 73 Shape is not construed as limiting.
Figure 18 a is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film.Such as Figure 18 a institute Show, it includes multiple optical fiber structures 74 arranged in the same direction that angle, which limits film 70, and Figure 18 b is the optical fiber structure 74 along Figure 18 a Extending direction the schematic diagram of the section structure.In conjunction with 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 out effect.
Specifically, the inner core 741 of optical fiber structure 74 is different with the refractive index of shell 742, angle restriction film 70 penetrates angle Meet following formula:
Wherein, θ is the angle that penetrates that angle limits film 70, and n is to limit the film that film 70 contacts with angle in display module 10 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, the angle formed relative to optical fiber structure 74 limits film 70 When incidence angle is greater than θ, light will not be totally reflected in optical fiber structure 74, it can be pierced by optical fiber structure 74 by optical fiber structure Light absorbent 743 between 74 absorbs, which can limit film 70 by angle and filter out, and can not expose to fingerprint sensing On device 22, also it is achieved that angle limits film 70 to the incidence angle for limiting film 70 relative to angle, limits film 70 greater than angle It is filtered out through the light at angle, avoids and expose to same fingerprint sensor 22 via the light for touching the reflection of main body different location Caused by crosstalk phenomenon, improve the accuracy and precision of fingerprint recognition.
It optionally, include multiple optical fiber structures 74 arranged in the same direction when angle limits film 70, optical fiber structure 74 The refractive index of inner core 741 and shell 742 is different, and per two adjacent optical fiber structures 74 between when being provided with light absorbent 743, The diffusion length that angle limits film 70 meets following formula:
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.Illustratively, 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, relative to fingerprint sensor 22 incidence angle minimum can for angle limit film 70 penetrate angle, that is, The incidence angle critical value that light can be totally reflected in optical fiber structure 74, therefore there are following calculated relationshipsLikewise, angle limit film 70 diffusion length it is bigger, display panel carry out fingerprint recognition accuracy and Precision is lower.
Figure 19 a is the overlooking structure diagram that another angle provided in an embodiment of the present invention limits film, and Figure 19 b is edge The schematic diagram of the section structure of G1-G2 in Figure 19 a.In conjunction with 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 include inner core 751 and shell 752, and inner core 751 is identical with the refractive index of shell 752, The material for constituting shell 752 includes light absorbent, then exposing to the light on shell 352 by inner core 751 can be by shell 752 It absorbs, i.e., some light can not expose 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, can be absorbed by shell 752 by the light that inner core 751 exposes on shell 752, therefore, angle limit That determines film 70 meets following formula through angle:
Wherein, θ is the angle that penetrates 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 exist from Figure 19 bCalculated relationship, therefore angle limit film 70 through angle meet on State formula.
It optionally, include multiple column structures 75 arranged in the same direction when angle limits film 70, column structure 75 wraps Inner core 751 and shell 752 are included, inner core 751 is identical with the refractive index of shell 752, and the material for constituting shell 752 includes light absorbent When, the diffusion length that angle limits film 70 meets following formula:
Wherein, Δ X is the diffusion length that angle limits film 70, and H is the thickness of display module 10.The derivation process of the formula Similar with the angle of structure shown in Figure 16 a restriction derivation process of diffusion length of film 70, which is not described herein again, likewise, angle The diffusion length that degree limits film 70 is bigger, and the accuracy of display panel progress fingerprint recognition and precision are lower.
It should be noted that saying that column structure 75 is corresponding to can be Figure 19 a institute from the depression angle that angle limits film 70 The circular configuration shown, it is corresponding the shape of column structure 75 to be limited with the structure of other shapes, the embodiment of the present invention 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 It is bigger at a distance from actually detected light is between the reflection point in touch main body to disturb detection light, when actually detected light and does Distance of the detection light between the reflection point in touch main body is disturbed to be greater than in fingerprint between paddy 42 and ridge 41 adjacent thereto Apart from when, the fingerprint identification process of display panel can be made mistake occur, the identification of fingerprint also can not be just carried out, seriously affect aobvious Show the accuracy of panel fingerprint recognition.
Optionally, fingerprint recognition mould group 20 and angle, which limit, can be set optical adhesive layer between film 70, for knowing fingerprint Other mould group 20 limits film 70 with angle and coheres.Optionally, fingerprint sensor 22 includes optical fingerprint sensor, optical finger print sensing Illustratively fingerprint sensor 22 can be constituted according to the detection and identification for carrying out fingerprint via the light for touching main body reflection Material include the light absorptives material such as amorphous silicon or GaAs or arsenones, be also possible to other light absorptive materials, the present invention Embodiment is not construed as limiting the material for constituting fingerprint sensor 22.
The embodiment of the present invention limits film 70 by the way that angle is arranged between display module 10 and fingerprint recognition mould group 20, and Angle restriction film 70 can be filtered out to be reflexed in the light of fingerprint sensor 22 via touch main body, limits film 70 relative to angle Incidence angle be greater than the light through angle that angle limits film 70, i.e., the setting that angle limits film 70 can be to passing through in the prior art Selectively filtered out by the light that touch main body different location reflexes to same fingerprint sensor 22, effectively prevent via The light for touching the reflection of main body different location exposes to crosstalk phenomenon caused by same fingerprint sensor 22, improves fingerprint recognition Accuracy and precision.
The embodiment of the invention also provides a kind of display devices.Figure 20 is a kind of display device provided in an embodiment of the present invention Structural schematic diagram.Referring to fig. 20, which includes any one display panel 201 provided in an embodiment of the present invention. The display device 101 is specifically as follows mobile phone, tablet computer and intelligent wearable device etc..
Black matrix is arranged by the way that black matrix is arranged between thin film transistor (TFT) and fingerprint recognition mould group in the embodiment of the present invention 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, and the shading region that can use black matrix is blocked from fingerprint recognition mould group The light of outgoing reduces the reflected light that the light is formed in the grid of thin film transistor (TFT), source electrode and drain electrode, reduces in film crystalline substance A possibility that reflected light formed at the grid of body pipe, source electrode and drain electrode is incident in fingerprint recognition mould group, and then reduce because of this Part reflected light is incident on the noise formed after fingerprint recognition mould group.In addition open region is set in black matrix, can permit from The light being emitted in fingerprint recognition mould group is passed through from open region, is irradiated to user's pressing on the finger of the display panel, and permit Perhaps it is passed through by the reflected light that finger print reflects to form from open region.Setting, which can achieve, in this way improves fingerprint recognition mould group Signal-to-noise ratio improves the purpose of fingerprint recognition mould group fingerprint recognition precision.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.

Claims (15)

1. a kind of display panel characterized by comprising
Display module, the display module include first substrate and multiple pixel circuits, and the first substrate includes display area And the non-display area around the display area, the multiple pixel circuit are located at the viewing area of the first substrate In domain, the pixel circuit includes multiple thin film transistor (TFT)s, and the thin film transistor (TFT) includes grid, source electrode and drain electrode；
Fingerprint recognition mould group, the fingerprint recognition mould group are formed 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 between the thin film transistor (TFT) and the fingerprint recognition mould group, institute Stating black matrix includes shading region and the open region between the shading region, the grid of the thin film transistor (TFT), described The projection of source electrode and the drain electrode on the first substrate is located in the projection of the shading region on the first substrate.
2. display panel according to claim 1, which is characterized in that
The black matrix is set between the thin film transistor (TFT) and the first substrate；And/or
The black matrix is set between the first substrate and the fingerprint recognition mould group.
3. display panel according to claim 2, which is characterized in that
The first substrate is rigid substrates or flexible base board.
4. display panel according to claim 3, which is characterized in that
The first substrate is rigid substrates；
The black matrix is set between the thin film transistor (TFT) and the first substrate；
The display panel further 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 It covers the shading region of the black matrix and fills the open region of the black matrix.
5. display panel according to claim 4, which is characterized in that first planarization layer and second planarization The material of layer is polyimides.
6. display panel according to claim 3, which is characterized in that
The first substrate is flexible base board；
The black matrix is set between the thin film transistor (TFT) and the first substrate；
The display panel further 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 cover the shading region of the black matrix and fill the open region of the black matrix.
7. display panel according to claim 6, which is characterized in that the first substrate and first planarization layer Material is polyimides.
8. display panel according to claim 1, which is characterized in that the thin film transistor (TFT) is bottom grating structure, comprising:
Form grid on the first substrate；
The first insulating layer being formed on the grid；
Form active layer on the first insulating layer；
Form source electrode and drain electrode on the active layer.
9. display panel according to claim 1, which is characterized in that the thin film transistor (TFT) is top gate structure, comprising:
Form active layer on the first substrate；
Form the first insulating layer on the active layer；
Form grid on the first insulating layer；
The second insulating layer being formed on the grid；
Form source electrode and drain electrode on the second insulating layer.
10. display panel according to claim 1, which is characterized in that the display module further includes being located at the pixel Circuit deviates from the luminescence unit of the first substrate side；
The pixel circuit and the luminescence unit correspond；
The upright projection of the luminescence unit on the first substrate be located at the shading region on the first substrate hang down It delivers directly in shadow.
11. display panel according to claim 1, which is characterized in that
The fingerprint recognition mould group includes:
The second substrate,
Form the fingerprint sensor of multiple discrete settings on the second substrate, the fingerprint sensor is set to described the Two substrates are close to the side of the first substrate；
The open region that the 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, which is characterized in that
The fingerprint recognition mould group further includes backlight, and the backlight is set to the second substrate away from the first substrate Side.
13. display panel according to claim 12, which is characterized in that
The backlight is collimated light source.
14. display panel according to claim 1, which is characterized in that
The fingerprint recognition mould group and the first substrate pass through optics gluing knot.
15. a kind of display device, which is characterized in that including the described in any item display panels of claim 1-14.
CN201710287809.0A 2017-04-27 2017-04-27 Display panel and display device Active CN106940488B (en)

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