CN111240065A - Display panel, display device and preparation method of display panel - Google Patents

Display panel, display device and preparation method of display panel Download PDF

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Publication number
CN111240065A
CN111240065A CN202010075265.3A CN202010075265A CN111240065A CN 111240065 A CN111240065 A CN 111240065A CN 202010075265 A CN202010075265 A CN 202010075265A CN 111240065 A CN111240065 A CN 111240065A
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China
Prior art keywords
hole
fingerprint identification
light
display panel
unit
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CN202010075265.3A
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Chinese (zh)
Inventor
康建松
赖育辉
林岩
吴登阳
李泉
连伟琼
蔡宗翰
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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Priority to CN202010075265.3A priority Critical patent/CN111240065A/en
Publication of CN111240065A publication Critical patent/CN111240065A/en
Pending legal-status Critical Current

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    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the invention discloses a display panel, a display device and a preparation method of the display panel. The display panel includes a first substrate base plate; a plurality of fingerprint identification units positioned on one side of the first substrate; the plurality of collimation hole units are positioned on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the light through holes of the light shielding parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area of each light through hole; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; the side wall of the collimation hole is provided with a reflection unit. The display panel provided by the embodiment of the invention can improve the fingerprint identification precision.

Description

Display panel, display device and preparation method of display panel
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a display device and a preparation method of the display panel.
Background
Since fingerprints of everyone have uniqueness and invariance, a technology of recognizing fingerprints as identities has been rapidly developed in recent years. For example, in the field of mobile phones, the optical fingerprint identification technology is applied more and more widely with the requirement of more and more people on narrow borders and full screens of the mobile phones. Before a user operates the display device with the fingerprint identification function, the user only needs to touch the fingerprint identification unit of the display device with a finger to carry out authority verification, and the authority verification process is simplified. However, the display device with fingerprint recognition function in the prior art has low fingerprint recognition accuracy.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a preparation method of the display panel, and aims to achieve the effect of improving fingerprint identification precision.
In a first aspect, an embodiment of the present invention provides a display panel, where the display panel includes:
a first substrate base plate;
a plurality of fingerprint identification units positioned on one side of the first substrate;
the plurality of collimating hole units are positioned on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part;
the shading part is provided with a light through hole; the light through holes of the light shading parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area where each light through hole is located; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; and the side wall of the collimation hole is provided with a reflection unit.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes: the display panel of the first aspect.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, where the method for manufacturing a display panel includes:
providing a first substrate base plate;
forming a plurality of fingerprint identification units on the first substrate;
forming a plurality of alignment hole units on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the light through holes of the light shading parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area where each light through hole is located; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; and the side wall of the collimation hole is provided with a reflection unit.
The display panel, the display device and the preparation method of the display panel provided by the embodiment of the invention comprise a plurality of fingerprint identification units and a plurality of collimation hole units, wherein each collimation hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the area where each light through hole is located forms a collimation hole, and the vertical projection of the collimation hole on the plane where the first substrate base plate is located is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane where the first substrate base plate is located, namely, the collimation hole formed in the area where each light through hole is located guides the light reflected by the fingerprint of the finger to be incident to the fingerprint identification unit, so that the fingerprint identification is realized, the shading part blocks the stray light, the stray light is prevented from entering the fingerprint identification unit, and the fingerprint identification precision is improved; furthermore, the reflecting unit is arranged on the side wall of the collimating hole, and partial stray light which cannot be completely shielded by the light shielding part is reflected again by the reflecting unit, so that the problem that the fingerprint identification precision is influenced because the partial stray light enters the fingerprint identification unit after passing through the light shielding part is solved; and/or, reflect the light that the finger reflects once more through the reflection element, incide to the fingerprint identification unit as effective light again, avoided partial effective light to be sheltered from by the shading portion and make this partial effective light can not by make full use of to cause the less problem of light that the fingerprint identification unit received, increase the intensity of the effective light that gets into the fingerprint identification unit, improve the fingerprint identification precision.
Drawings
FIG. 1 is a schematic diagram of a display panel in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an insulating layer according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 13 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 15 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 16 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 18 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention;
FIG. 19 is a schematic structural diagram of a light-passing hole formed according to an embodiment of the present invention;
FIG. 20 is a schematic structural diagram of an annular via according to an embodiment of the present invention;
FIG. 21 is a schematic structural diagram of a sub-reflection unit after being formed according to an embodiment of the present invention;
fig. 22 is a schematic structural diagram after a plurality of sub-reflection units are formed according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel in the prior art, as shown in fig. 1, the display panel in the prior art includes a first substrate 10 ', a fingerprint identification unit 20 ', a collimating hole 40 ' and a light shielding portion 41 ', and a stray light β ' (dotted lines composed of dots and dots in fig. 1) is blocked by the light shielding portion 41 ' to interfere with the fingerprint identification unit 20 ', however, when the light shielding portion 41 ' cannot completely block the stray light β ', a part of the stray light β ' passes through the light shielding portion 41 ' and then enters the fingerprint identification unit 20 ', and interferes with the fingerprint identification accuracy, and besides, a part of the light reflected by the fingerprint of the finger, i.e., an effective light α ' (dotted lines composed of dots and lines in fig. 1), is received by the fingerprint identification unit 20 ' through the collimating hole 40 ', so that the fingerprint identification is realized, and a part of the light reflected by the fingerprint of the finger, i.e., an effective light γ ' (dotted lines composed of dots and lines in fig. 1) is reflected by the light shielding portion 41 ' to the light 41 ', and thus the effective light γ ' is sufficiently blocked by the fingerprint identification unit 20, and the fingerprint identification accuracy is less influenced by the fingerprint identification signal.
Based on the above technical problem, an embodiment of the present invention provides a display panel, including: a first substrate base plate; a plurality of fingerprint identification units positioned on one side of the first substrate; the plurality of collimation hole units are positioned on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the light through holes of the light shielding parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area of each light through hole; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; the side wall of the collimation hole is provided with a reflection unit. By adopting the technical scheme, the light reflected by the finger fingerprint is guided to be incident to the fingerprint identification unit through the collimation hole formed in the area where each light through hole is located, so that the fingerprint identification is realized, the stray light is blocked by the shading part, the stray light is prevented from entering the fingerprint identification unit, and the fingerprint identification precision is improved; furthermore, the reflecting unit is arranged on the side wall of the collimating hole, and partial stray light which cannot be completely shielded by the light shielding part is reflected again by the reflecting unit, so that the problem that the fingerprint identification precision is influenced because the partial stray light enters the fingerprint identification unit after passing through the light shielding part is solved; and/or, reflect the light that the finger reflects once more through the reflection element, incide to the fingerprint identification unit as effective light again, avoided partial effective light to be sheltered from by shading portion, and make this partial effective light can not by make full use of to cause the less problem of light that the fingerprint identification unit received, increase the intensity of the effective light that gets into the fingerprint identification unit, improve the fingerprint identification precision.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 2, the display panel according to the embodiment of the present invention includes: a first substrate base plate 10; a plurality of fingerprint recognition units 20 located at one side of the first substrate base 10; a plurality of collimating hole units 30 located at a side of the fingerprint identification unit 20 away from the first substrate base plate 10; the collimating hole unit 30 includes at least one layer of light-shielding portion 41; the light shielding portion 41 is provided with a light passing hole 42; the light transmission holes 42 of the light shielding portions 41 at least partially overlap in vertical projection on the plane of the first substrate 10; the area of each light through hole 42 forms a collimation hole 40; the vertical projection of the collimation hole 40 on the plane of the first substrate base plate 10 at least partially overlaps with the vertical projection of the fingerprint identification unit 20 on the plane of the first substrate base plate 10; the sidewall of the collimating hole 40 is provided with a reflecting unit 50.
Specifically, reflected light α of finger fingerprint reflection guides the light of finger fingerprint reflection to incide to fingerprint identification unit 20 through collimation hole 40 that each light-passing hole 42 place formed to realize fingerprint identification, because shading portion 41 blocks partial stray light β, prevents that partial stray light β from getting into fingerprint identification unit 20, has improved the fingerprint identification precision.
Further, by providing the reflection unit 50 on the side wall of the collimating hole 40, wherein the reflection unit 50 may have a reflection effect on the surface on the side of the collimating hole 40, or may have a reflection effect on the surface on the side far from the collimating hole 40, or may have a reflection effect on both surfaces, when the reflection unit 50 has a reflection effect on the surface on the side of the collimating hole 40, the reflected light from the fingerprint of the finger is not directly received by the fingerprint identification unit 20 except for part of the effective light α/α, i.e. the reflected light from the fingerprint, and part of the effective light α/α is incident on the reflection unit 50, and is reflected again by the reflection unit 50, and is received again by the fingerprint identification unit 20, thereby increasing the intensity of the effective light entering the fingerprint identification unit, enhancing the fingerprint identification signal, and improving the fingerprint identification accuracy, when the reflection unit 50 has a reflection effect on the surface on the side far from the collimating hole 40, the reflected light of the part of the non-finger is incident light β incident on the display panel, except for part β, and the reflected light of the reflected light is completely blocked by the stray light before the stray light reflected light enters the fingerprint identification unit 3641, and the stray light is reflected by the stray light before the stray light is reflected light enters the fingerprint identification unit 20, and the stray light is completely blocked by the stray light before the stray light is reflected light before the stray light is reflected by the stray light before the stray light is reflected light before the fingerprint identification unit 20, thus the stray light.
It is understood that, when the collimating hole unit 30 includes one layer of the light shielding portion 41, the light passing hole 42 of the light shielding portion 41 is the collimating hole 40; when the collimating hole unit 30 includes two or more light-shielding portions 41, the through holes 42 of the light-shielding portions 41 at least partially overlap each other in a vertical projection on the plane of the first substrate 10, and the collimating holes 40 are formed in the areas of the light-passing holes 42. Fig. 2 illustrates only the collimating hole unit 30 including three light-shielding portions 41.
It should be noted that the position of the reflection unit 50 on the sidewall of the collimating hole 40 is not specifically limited in this embodiment, for example, the reflection unit may completely cover the sidewall of the collimating hole 40, or may partially cover the sidewall of the collimating hole 40, and those skilled in the art may specifically adjust according to actual conditions such as the aperture of the collimating hole 40 and the height of the collimating hole 40, when the reflection unit 50 completely covers the sidewall of the collimating hole 40, the partial stray light β that cannot be completely blocked by the light blocking portion 41 can be reflected again to a greater extent, and/or the partial effective light α 1 is reflected again to be received again by the fingerprint identification unit 20, so as to improve the fingerprint identification accuracy.
Alternatively, the first substrate 10 may be, for example, a substrate disposed in an array substrate of a display panel, where the array substrate includes a thin film transistor to control the display of the display panel. Optionally, when the thin film transistor is fabricated on the first substrate 10, the fingerprint identification unit 20 is fabricated at the same time, that is, the fingerprint identification unit 20 may also be formed by reusing a part of the film layer fabricated by the original display panel, so that the overall thickness of the display panel is reduced while the process is reduced.
Optionally, the material of the reflection unit 50 includes at least one of copper, molybdenum, aluminum, and silver, and for example, may be a single-component material of copper, or a single-component material of molybdenum, or a single-component material of aluminum, or a single-component material of silver; the reflective film may also be a combination material of molybdenum, aluminum, or molybdenum, aluminum, molybdenum, or the like, but the embodiment of the present invention is not limited thereto as long as the reflective film can reflect light.
In summary, in the embodiment of the present invention, the light reflected by the finger fingerprint is guided to be incident on the fingerprint identification unit through the collimating holes formed in the areas where the light-passing holes are located, so as to realize fingerprint identification, and stray light is blocked by the light-blocking portion, so that the stray light is prevented from entering the fingerprint identification unit, and the fingerprint identification precision is improved; furthermore, the reflecting unit is arranged on the side wall of the collimating hole, and partial stray light which cannot be completely shielded by the light shielding part is reflected again by the reflecting unit, so that the problem that the fingerprint identification precision is influenced because the partial stray light enters the fingerprint identification unit after passing through the light shielding part is solved; and/or, reflect the light that the finger reflects once more through the reflection element, incide to the fingerprint identification unit as effective light again, avoided partial effective light to be sheltered from by the shading portion and make this partial effective light can not by make full use of to cause the less problem of light that the fingerprint identification unit received, increase the intensity of the effective light that the fingerprint identification unit received, improve the fingerprint identification precision.
Optionally, fig. 3 is a schematic structural diagram of an insulating layer according to an embodiment of the present invention, and as shown in fig. 2 and fig. 3, the collimating hole unit 30 further includes an insulating layer 60; the insulating layer 60 is positioned between two adjacent layers of the light-shielding parts 41 and between the light-shielding parts 41 and the fingerprint identification unit 20; the insulating layer 60 is provided with an annular through hole 61; the annular through hole 61 is positioned in the area surrounded by the light through hole 42; the reflection unit 50 is located in the annular through hole 61, which is only a specific example of the present invention and is not a limitation of the present invention. Optionally, fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 4, the insulating layer 60 in the area corresponding to the collimating hole unit 30 includes a hollow portion 61, that is, the insulating layer 60 in the area corresponding to the collimating hole unit 30 is completely dug away, and the reflective unit 50 is disposed on the sidewall of the remaining insulating layer 60.
The insulating layer 60 may include, for example, an optical glue layer having a high transmittance, a planarization layer, and the planarization layer may be made of, for example, a resin material or another insulating material, but the material of the insulating layer 60 is not particularly limited in this embodiment. The number of layers of the insulating layer 60 and the specific position of the reflection unit 50 in the collimating hole are not specifically limited in this embodiment, and can be adjusted by those skilled in the art according to actual situations.
According to the display panel provided by the embodiment of the invention, the reflection unit is arranged in the annular through hole formed in the insulating layer, or the reflection unit is arranged on the side wall of the residual insulating layer, so that part of stray light which cannot be completely shielded by the shielding part is reflected again through the reflection unit, and/or part of effective light is reflected again to the fingerprint identification unit, so that a fingerprint identification signal is enhanced, and the fingerprint identification precision is improved.
Optionally, with continued reference to fig. 2, the reflecting unit 50 is perpendicular to the plane of the first substrate base plate 10.
In the embodiment, when the reflection unit 50 is perpendicular to the plane of the first substrate 10, the manufacturing is simple and the process steps are simplified.
In particular, the reflection unit 50 may be inclined, so that more effective light is reflected to the fingerprint identification unit 20 by the inclined reflection unit 50. The following description is made in detail with respect to a typical display panel structure, but the examples are given for the purpose of illustrating the present invention only and are not intended to limit the present invention.
Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 5, a reflection unit 50 includes a first slope 51; the first inclined plane 51 comprises a first top end 511 and a first bottom end 512, and the first bottom end 512 is located at one side of the first top end 511 close to the fingerprint identification unit 20; the first top end 511 is located at one side of the first bottom end 512 away from the central axis ZZ of the collimation hole 40; that is, the reflection unit 50 is disposed to be inclined in a direction away from the central axis ZZ of the collimating hole 40 from the direction in which the first substrate 10 is directed to the fingerprint recognition unit 20; wherein, the included angle between the reflection unit 50 and the central axis ZZ of the collimation hole 40 is a first included angle A, and A is more than 0 degree and less than or equal to 35 degrees.
When the display panel is a liquid crystal display panel, the display panel includes an array substrate 70, a liquid crystal layer 80 and a color film substrate 90, and the liquid crystal layer 80 is located between the color film substrate 90 and the array substrate 70. The reflection unit 50 may be disposed only in the color film substrate 90, as shown in fig. 5; the reflection unit 50 may also be provided only within the array substrate 70, as shown in fig. 6; the reflection units 50 (not shown) may also be disposed in both the color filter substrate 90 and the array substrate 70, and this embodiment is not particularly limited.
Specifically, in the display panel provided by the embodiment of the present invention, the first substrate 10 is directed to the fingerprint identification unit 20, the reflection unit 50 is disposed in an inclined manner in a direction away from the central axis ZZ of the collimating hole 40, and an included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is a first included angle a, 0 ° < a ≦ 35 °, so that the light incident to the collimating hole 40 is not reflected by the reflection unit 50 because the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is greater than 35 °, therefore, when the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is the first included angle a, 0 ° < a ≦ 35 °, the light incident to the collimating hole 40 is not reflected by the reflection unit 50 because the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is greater than 35 °, and more effective light can be reflected to the fingerprint identification unit 20, and fingerprint identification precision. Optionally, an included angle between the reflection unit 50 and the central axis ZZ of the collimating aperture 40 is a first included angle a, where a is greater than 0 ° and less than or equal to 25 °. It is considered that when the angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is large, part of the stray light is introduced. Therefore, in the embodiment, the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is the first included angle a, and a is more than 0 degree and less than or equal to 25 degrees, so that more effective light rays can be reflected to the fingerprint identification unit 20, and the problem that the fingerprint identification precision is affected due to the fact that part of stray light rays are introduced due to the fact that the reflection unit 50 is obliquely arranged can be solved, and the effect of improving the fingerprint identification precision is achieved. Optionally, an included angle between the reflection unit 50 and the central axis ZZ of the collimating aperture 40 is a first included angle a, where a is greater than 0 ° and less than or equal to 22 °. When the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is a first included angle A, and A is more than 0 degrees and less than or equal to 22 degrees, the included angle can be further reduced, even stray light can be prevented from entering the collimating hole 40, and the fingerprint identification precision is further improved.
Alternatively, fig. 7 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, as shown in fig. 7, the reflection unit 50 includes a plurality of sub-reflection units 52 along a direction perpendicular to the first substrate 10; at least part of the sub-reflecting unit 52 includes a second slope 53; the second inclined plane 53 comprises a second top end 531 and a second bottom end 532, and the second bottom end 532 is located at a side of the second top end 531 close to the fingerprint identification unit 20; the second top end 531 is located at a side of the second bottom end 532 away from the central axis ZZ of the collimation hole 40; that is, in a direction from the first substrate 10 toward the fingerprint recognition unit 20, the sub-reflection unit 52 is disposed obliquely in a direction away from the central axis ZZ of the collimating hole 40; wherein, the included angle between at least part of the sub-reflection units 52 and the central axis ZZ of the collimating hole 40 is a first included angle A, and A is more than 0 degree and less than or equal to 35 degrees.
Specifically, in the display panel provided in the embodiment of the present invention, the first substrate 10 points to the fingerprint identification unit 20, the partial sub-reflection unit 52 is disposed to be inclined in a direction away from the central axis ZZ of the collimation hole 40, and an included angle between the partial sub-reflection unit 52 and the central axis ZZ of the collimation hole 40 is a first included angle a, where a is greater than 0 ° and less than or equal to 35 °, so that the light incident to the collimation hole 40 is not reflected out after passing through the sub-reflection unit 52 because the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimation hole 40 is greater than 35 °, and more effective light can be reflected to the fingerprint identification unit 20, thereby improving the fingerprint identification accuracy. Optionally, the included angle between at least part of the sub-reflecting units 52 and the central axis ZZ of the collimating hole 40 is a first included angle A, and A is more than 0 degree and less than or equal to 25 degrees. It is considered that when the angle between the sub-reflecting unit 52 and the central axis ZZ of the collimating hole 40 is large, part of the stray light is introduced. Therefore, in this embodiment, the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is the first included angle a, and a is greater than 0 ° and less than or equal to 25 °, so that more effective light rays can be reflected to the fingerprint identification unit 20, and the problem that the fingerprint identification accuracy is affected by introducing part of stray light rays due to the inclined arrangement of the sub-reflection unit 52 is also reduced, thereby achieving the effect of improving the fingerprint identification accuracy. Optionally, an included angle between the sub-reflecting unit 52 and the central axis ZZ of the collimating aperture 40 is a first included angle a, where a is greater than 0 degrees and less than or equal to 22 degrees. When the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is the first included angle a, and a is greater than 0 degrees and less than or equal to 22 degrees, the stray light can be further reduced from entering the collimating hole 40, and even can be prevented from entering the collimating hole 40, so that the fingerprint identification precision is further improved.
It is understood that all the sub-reflection units 52 may be disposed in a direction away from the central axis ZZ of the collimating hole 40, as shown in fig. 7, and a part of the sub-reflection units 52 may also be disposed in a direction away from the central axis ZZ of the collimating hole 40, and a part of the sub-reflection units 52 are disposed vertically, as shown in fig. 8, this embodiment is not particularly limited, and those skilled in the art may adjust the present invention according to actual situations as long as more effective light rays can be reflected to the fingerprint identification unit 20.
Alternatively, fig. 9 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, and as shown in fig. 9, the reflection unit 50 includes a third inclined surface 54; the third inclined plane 54 comprises a third top end 541 and a third bottom end 542, and the third bottom end 542 is located at a side of the third top end 541 close to the fingerprint identification unit 20; the third top end 541 is located on a side of the third bottom end 542 close to the central axis ZZ of the collimating hole 40, that is, the first substrate 10 points to the fingerprint identification unit 20, and the reflection unit 50 is inclined to the direction close to the central axis ZZ of the collimating hole 40; and the included angle between the reflecting unit 20 and the central axis ZZ of the collimating hole 40 is a second included angle B, and B is more than 0 degree and less than or equal to 50 degrees.
It is considered that a part of the effective light is reflected to the area outside the fingerprint identification area after being reflected by the reflection unit 50. In this embodiment, the first substrate 10 points to the direction of the fingerprint identification unit 20, and the reflection unit 50 is inclined toward the central axis ZZ near the collimating hole 40, so that the effective light reflected by the fingerprint of the finger can be gathered to the fingerprint identification unit 20, and the problem that a part of the effective light is reflected to the area outside the fingerprint identification area after being reflected by the reflection unit 50 is avoided, thereby improving the fingerprint identification precision. Furthermore, the included angle between the reflection unit 20 and the central axis ZZ of the collimating hole 40 is a second included angle B, B is larger than 0 degree and smaller than or equal to 50 degrees, when the included angle between the reflection unit 20 and the central axis ZZ of the collimating hole 40 is the second included angle B, and B is larger than 0 degree and smaller than or equal to 50 degrees, more effective light rays can be reflected to the fingerprint identification unit 20, and the fingerprint identification precision is improved. Optionally, an included angle between the reflection unit 20 and the central axis ZZ of the collimating aperture 40 is a second included angle B, and B is greater than 0 degree and less than or equal to 40 degrees. Considering that when the included angle between the reflection unit 20 and the central axis ZZ of the collimating hole 40 is large, that is, when the opening for receiving the effective light is small, part of the effective light cannot enter the collimating hole 40, the included angle between the reflection unit 20 and the central axis ZZ of the collimating hole 40 in this embodiment is a second included angle B, where B is greater than 0 ° and less than or equal to 40 °, and therefore, the fingerprint identification accuracy is not affected because less effective light is reflected to the fingerprint identification unit 20 due to the large included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40; meanwhile, more effective light rays can be reflected to the fingerprint identification unit 20, and the fingerprint identification precision is improved. Optionally, the included angle between the reflection unit 20 and the central axis ZZ of the collimating aperture 40 is a second included angle B, and B is greater than 0 degree and less than or equal to 32.6 degrees. When the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is the second included angle B, and B is greater than 0 degree and less than or equal to 32.6 degrees, the problem that the fingerprint identification precision is affected due to the fact that less effective light rays are reflected to the fingerprint identification unit 20 due to the fact that the included angle between the reflection unit 50 and the central axis ZZ of the collimating hole 40 is large can be further avoided, and more effective light rays can be reflected to the fingerprint identification unit 20 through the reflection unit 50, and the fingerprint identification precision is improved.
Similarly, when the display panel is a liquid crystal display panel, the reflection unit 50 may be disposed only in the color film substrate 90; may be provided only in the array substrate 70; the reflection units 50 may also be disposed in both the color filter substrate 90 and the array substrate 70, which is not specifically limited in this embodiment, and fig. 9 illustrates that only the reflection unit 50 is disposed in the color filter substrate 90.
Alternatively, fig. 10 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and as shown in fig. 10, along a direction perpendicular to the first substrate 10, the reflection unit 50 includes a plurality of sub-reflection units 52; at least part of the sub-reflecting unit 52 includes a fourth slope 55; the fourth slope 55 comprises a fourth top end 551 and a fourth bottom end 552, and the fourth bottom end 552 is located at a side of the fourth top end 551 close to the fingerprint identification unit 20; the fourth bottom end 552 is located on the side of the fourth top end 551 close to the central axis ZZ of the collimating hole 40; that is, from the direction in which the first substrate base 10 points toward the fingerprint recognition unit 20, the sub-reflection unit 52 is disposed obliquely to the direction close to the central axis ZZ of the collimating hole 40; wherein, the included angle between at least part of the sub-reflection units 52 and the central axis ZZ of the collimation hole 40 is a second included angle B, and B is more than 0 degree and less than or equal to 50 degrees.
Specifically, in the display panel provided by the embodiment of the present invention, the first substrate 10 points to the direction of the fingerprint identification unit 20, the partial sub-reflection unit 52 is disposed to be inclined toward the direction close to the central axis ZZ of the collimating hole 40, and the included angle between the partial sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is a second included angle B, where B is greater than 0 ° and less than or equal to 50 °, so that more effective light rays can be reflected to the fingerprint identification unit 20, and the fingerprint identification accuracy is improved. Optionally, the included angle between at least part of the sub-reflecting units 52 and the central axis ZZ of the collimating hole 40 is a second included angle B, and B is greater than 0 degree and less than or equal to 40 degrees. Considering that when the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is large, that is, when the opening for receiving the effective light beam is small, part of the effective light beam cannot enter the collimating hole 40, the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is a second included angle B, where B is greater than 0 ° and less than or equal to 40 °, and therefore, the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 do not reflect less effective light to the fingerprint identification unit 20 due to the large included angle therebetween, thereby affecting the fingerprint identification accuracy; meanwhile, more effective light rays can be reflected to the fingerprint identification unit 20, and the fingerprint identification precision is improved. Optionally, the included angle between the sub-reflecting unit 52 and the central axis ZZ of the collimating aperture 40 is a second included angle B, and B is greater than 0 degree and less than or equal to 32.6 degrees. When the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is the second included angle B, and B is greater than 0 degree and less than or equal to 32.6 degrees, the problem that the fingerprint identification precision is affected due to the fact that less effective light rays are reflected to the fingerprint identification unit 20 due to the fact that the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is large can be further avoided, and more effective light rays can be reflected to the fingerprint identification unit 20 through the sub-reflection unit 52, and the fingerprint identification precision is further improved.
Optionally, fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention, as shown in fig. 11, an angle between the sub-reflecting unit 52 and the central axis ZZ of the collimating hole 40 gradually decreases from the direction in which the first substrate 10 points to the fingerprint identification unit 20.
It is considered that when the sub-reflecting unit 52 is disposed perpendicular to the plane of the first substrate 10, the effective light reflected by the finger enters the fingerprint unit 20 after passing through the sub-reflecting unit 52 and then being reflected a plurality of times. Therefore, the sub-reflection unit 52 is obliquely arranged, and the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is gradually reduced, so that the problem that when the included angle between the sub-reflection unit 52 and the central axis ZZ of the collimating hole 40 is gradually increased in the direction that the first substrate base plate 10 points to the fingerprint identification unit 20, effective light beams reflected by a finger are reflected to the finger fingerprint after passing through the sub-reflection unit 52, and are reflected again through the finger fingerprint is solved, more effective light beams can be rapidly gathered to the fingerprint identification unit 20, and the fingerprint identification precision is improved. Fig. 11 illustrates only the sub-reflection unit 52 being disposed obliquely in a direction away from the central axis ZZ of the collimating hole 40, and the sub-reflection unit 52 gradually decreasing an angle with the central axis ZZ of the collimating hole 40 when the first substrate base plate 10 points to the fingerprint identification unit 20, but not limiting the present application, in other alternative embodiments, the sub-reflection unit 52 is disposed obliquely in a direction close to the central axis ZZ of the collimating hole 40, and the sub-reflection unit 52 gradually decreasing an angle with the central axis ZZ of the collimating hole 40 when the first substrate base plate 10 points to the fingerprint identification unit 20, for example, referring to fig. 12, fig. 12 is a schematic structural diagram of another display panel provided by an embodiment of the present invention, the sub-reflection unit 52 is disposed obliquely in a direction close to the central axis ZZ of the collimating hole 40, and the first substrate base plate 10 points to the fingerprint identification unit 20, the sub-reflecting unit 52 has a gradually decreasing angle with the central axis ZZ of the collimating hole 40.
Alternatively, fig. 13 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, as shown in fig. 13, the reflection unit 50 includes a plurality of sub-reflection units 52 along a direction perpendicular to the first substrate 10; the adjacent sub-reflecting units 52 are inclined in opposite directions.
In this embodiment, the inclination directions of the adjacent sub-reflection units 52 are opposite, so that more effective light rays can be reflected to the fingerprint identification unit 20 quickly, and the fingerprint identification precision is improved.
Alternatively, more effective light rays can be collected to the fingerprint identification unit 20 by combining the sub-reflection units 52 perpendicular to the plane of the first substrate base plate 20 and the sub-reflection units 52 with opposite inclination directions, and the specific structure of the embodiment is not particularly limited as long as more effective light rays can be collected to the fingerprint identification unit 20. For example, fig. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 14, a sub-reflection unit 52 perpendicular to the plane of the first substrate 20 is disposed between two sub-reflection units 52 with opposite tilt directions.
In summary, the above embodiment improves the fingerprint recognition accuracy by obliquely disposing the reflection unit 50 so that more effective light rays are reflected to the fingerprint recognition unit 20.
It is understood that the above examples merely illustrate the way the reflection unit 50 is disposed obliquely, but do not limit the present application. Those skilled in the art can set the position of the reflection unit 50 according to the actual structural condition of the display panel, for example, the position is set on the array substrate and/or the color filter substrate, and the inclination angles of the sub-reflection units 52 of the reflection unit 50 are randomly combined, that is, the setting is flexible, as long as more effective light rays can be collected to the fingerprint identification unit 20.
Alternatively, a microstructure may be disposed on the reflection unit 50 to reflect more effective light to the fingerprint recognition unit 20. The following description is made in detail with respect to a typical display panel structure, but the examples are given for the purpose of illustrating the present invention only and are not intended to limit the present invention.
Fig. 15 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 15, a microstructure 56 is formed on the reflection unit 50.
Wherein microstructures 56 comprise raised structures and/or recessed structures. Fig. 15 only illustrates that the microstructure 56 includes a protruding structure. In other alternative embodiments, microstructures 56 include only recessed structures, or both raised and recessed structures.
In this embodiment, the micro-structure 56 is formed on the reflection unit 50, so that more effective light rays can be reflected to the fingerprint identification unit 20, and the fingerprint identification precision is improved.
Optionally, with reference to fig. 2, the display panel may include, for example, a liquid crystal display panel, and when the display panel is a liquid crystal display panel, the display panel includes an array substrate 70, a liquid crystal layer 80, and a color film substrate 90; the liquid crystal layer 80 is located between the color film substrate 90 and the array substrate 70; at least one light shielding portion 41 is disposed in the array substrate 70 and/or the color filter substrate 90.
The liquid crystal layer 80 is filled with liquid crystal molecules, the color film substrate 90 is provided with color resistors, light passing through the liquid crystal layer 80 is filtered through the color resistors, so that each sub-pixel has a fixed color, and the liquid crystal display panel applies voltage to the pixel electrode and the common electrode through a driving circuit (such as a gate signal driving circuit and a data signal driving circuit) in the array substrate 70, so as to drive the liquid crystal molecules to deflect, so that light emitted by backlight passes through the array substrate, is refracted out of the liquid crystal layer, and forms a color picture under the filtering action of the color resistors of the color film substrate 90.
Further, with continued reference to fig. 2, one layer of the light-shielding portions 41 in the color filter substrate 90 is multiplexed into a black matrix 91; the black matrix 91 is provided with a plurality of pixel openings 92; a colored resist layer 93 is provided in the pixel opening 92; the vertical projection of the fingerprint identification unit 20 and the collimating hole unit 30 on the plane of the first substrate 10 does not overlap with the vertical projection of the pixel opening 92 on the plane of the first substrate 10.
Wherein the color resist layer 93 may filter the backlight so that a single sub-pixel displays a specific color. Under the coordination of sub-pixels with different colors, such as sub-pixels with three colors of red, green and blue, a full-color pixel unit can be prepared, and therefore picture display is achieved. Illustratively, as shown in fig. 2, the color resistance layer 93 includes a first color resistance 931, a second color resistance 932 and a third color resistance 933, and the three color resistances may be red, green and blue color resistances respectively. In this embodiment, the vertical projection of the fingerprint identification unit 20 and the collimating hole unit 30 on the plane of the first substrate 10 does not overlap with the vertical projection of the pixel opening 92 on the plane of the first substrate 10, so that the display of the picture is not affected, and the identification of the fingerprint is not affected; in addition, when one layer of the light shielding portion 41 in the color filter substrate 90 is multiplexed as the black matrix 91, the process steps can be simplified.
Optionally, fig. 16 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, and as shown in fig. 16, the display panel may be, for example, an organic light emitting display panel, and when the display panel is an organic light emitting display panel, the display panel includes an array substrate 71, a display layer 72 located on one side of the array substrate 71, and a thin film encapsulation layer 80 located on one side of the display layer 72 away from the array substrate 71. The display layer includes a plurality of light emitting elements 73 and a pixel defining structure 74 surrounding the light emitting elements 73, and the light emitting elements 73 include an anode 731, a light emitting layer 732, and a cathode layer 733. At least one light shielding portion 41 is provided in the array substrate 71 and/or the display layer 72.
It should be noted that, when the display panel is an organic light emitting display panel, the setting manner, the setting position, and the operation principle of the reflection unit 50 disposed in the organic light emitting display panel are the same as those of the liquid crystal display panel in the above embodiment, and the description thereof is omitted here. The present embodiment does not specifically limit the type of the display panel, the position, the inclination angle, etc. of the reflection unit 50, as long as more effective light rays can be collected to the fingerprint identification unit 20 after passing through the reflection unit 50.
Based on the same inventive concept, the embodiment of the invention also provides a display device which comprises the display panel of any embodiment of the invention. Fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 17, a display device 100 according to an embodiment of the present invention includes a display panel 101 according to the above embodiment, and a principle of solving the problem of the display device is similar to that of the display panel according to the above embodiment, so that the embodiment of the display device 100 can refer to the above embodiment of the display panel, and repeated details are not repeated. For example, the display device 100 may be an electronic device such as a mobile phone, a computer, a smart wearable device (e.g., a smart watch), and an in-vehicle display device, which is not limited in this embodiment of the invention.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the display panel. Fig. 18 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention, and as shown in fig. 18, the method for manufacturing a display panel includes:
s110, providing a first substrate.
And S120, forming a plurality of fingerprint identification units on the first substrate.
S130, forming a plurality of collimation hole units on one side of the fingerprint identification unit, which is far away from the first substrate; the collimating hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the light through holes of the light shielding parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area of each light through hole; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; the side wall of the collimation hole is provided with a reflection unit.
According to the preparation method of the display panel, provided by the embodiment of the invention, the reflecting unit is arranged on the side wall of the collimating hole, so that part of stray light which cannot be completely shielded by the shielding part can be reflected again, and the problem that the fingerprint identification precision is influenced because part of the stray light enters the fingerprint identification unit after passing through the shielding part is solved; and/or, reflect the light that the finger reflects once more, incide to the fingerprint identification unit as effective light again, avoided partial effective light to be sheltered from by the shading portion, and make this partial effective light can not by make full use of to cause the less problem of light that the fingerprint identification unit received, increase the intensity of the effective light of finger fingerprint reflection, improve the fingerprint identification precision.
Optionally, the reflecting unit includes a plurality of sub-reflecting units along a direction perpendicular to the first substrate base plate; form a plurality of collimation hole units at fingerprint identification unit and keep away from first substrate base plate one side, include:
a light shielding portion is formed and a light passing hole is formed in the light shielding portion.
Fig. 19 is a schematic structural diagram of a substrate after forming a light-passing hole according to an embodiment of the present invention, and referring to fig. 19, a light-shielding portion 41 is formed on the substrate, where the light-shielding portion 41 may be made of a black matrix or other materials that can be used to shield stray light and prevent the stray light from entering a fingerprint identification unit. The light blocking portion 41 is provided with a light passing hole 42.
Forming an insulating layer and forming a ring-shaped through hole on the insulating layer; the annular through hole is positioned in the surrounding area of the light through hole.
Fig. 20 is a schematic structural diagram of an annular through hole according to an embodiment of the present invention, and referring to fig. 20, an insulating layer 60 is formed on a side of the light shielding portion 41 away from the substrate, where the insulating layer 60 may include, for example, OC glue or other insulating materials. For example, an etching process may be used to etch and form the annular through hole 61 on the insulating layer 60, wherein the annular through hole 61 is located in a region surrounded by the light-passing hole 42, so as to prevent the light-shielding portion 41 from being etched when the annular through hole 61 is formed by etching, and further influence the effect of the light-shielding portion 41 in shielding stray light.
Forming a reflecting layer and etching to form a sub-reflecting unit; the sub-reflecting unit is positioned in the annular through hole.
Fig. 21 is a schematic structural diagram of a sub-reflective unit after being formed according to an embodiment of the present invention, referring to fig. 21, for example, a reflective layer 500 may be formed on a side of the insulating layer 60 away from the substrate by a sputtering process, a transition photoresist layer 600 may be formed on the reflective layer 500, for example, a photoresist pattern 601 may be formed by a developing process, and the reflective layer 500 may be patterned by the photoresist pattern 601 and an etching process to form the sub-reflective unit 52, where the sub-reflective unit 52 is located in the annular through hole 61.
And circularly executing the steps until a plurality of sub-reflecting units of the reflecting unit are formed.
Fig. 22 is a schematic structural diagram after a plurality of sub-reflection units are formed according to an embodiment of the present invention, and referring to fig. 22, a second layer of light-shielding portion 41 is also formed on a side of the sub-reflection unit 52 away from the substrate. The optional light shielding portion 41 may be, for example, multiplexed as a black matrix, the black matrix is provided with a plurality of pixel openings, and a color resist layer is provided in each pixel opening. The light shielding portion 41 is provided with a light passing hole 42. . Then, an insulating layer 60 is formed on the side of the color resistance layer away from the substrate, and an annular through hole 61 is formed on the insulating layer 60 by etching through an etching process, wherein the annular through hole 61 is located in the area surrounded by the light through hole 42. Next, a reflective layer 500 is formed on the side of the insulating layer 60 away from the substrate by a sputtering process, a transition photoresist layer 600 is formed on the reflective layer 500, for example, a photoresist pattern 601 may be formed by a developing process, and the reflective layer 500 is patterned by the photoresist pattern 601 and an etching process to form a second sub-reflective unit 52, wherein the sub-reflective unit 52 is located in the annular through hole 61 until a plurality of sub-reflective units 52 of the reflective unit are formed. The area of each light-passing hole 42 forms a collimating hole. Partial stray light which cannot be completely shielded by the light shielding part 41 is reflected again by the sub-reflection units 52, so that the problem that the fingerprint identification precision is influenced because the partial stray light enters the fingerprint identification unit after passing through the light shielding part is solved; in addition, the light reflected by the finger is reflected again through the sub-reflection units 52 and is incident to the fingerprint identification unit as effective light again, so that the problem that part of the effective light is shielded by the shading part and cannot be fully utilized, the light received by the fingerprint identification unit is less is solved, the intensity of the effective light received by the fingerprint identification unit is increased, and the fingerprint identification precision is improved.
It should be noted that fig. 22 only exemplifies the formation of 2 sub-reflection units, and the number of the sub-reflection units 52 may be adjusted by those skilled in the art according to actual situations.
It should be noted that, in the above example, only the display panel is used as a liquid crystal display panel, and the reflection unit 50 is disposed in the color filter substrate 90 and includes two light-shielding portions, and one of the light-shielding portions is multiplexed as the black matrix 91 in the color filter substrate.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (16)

1. A display panel, comprising:
a first substrate base plate;
a plurality of fingerprint identification units positioned on one side of the first substrate;
the plurality of collimating hole units are positioned on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part;
the shading part is provided with a light through hole; the light through holes of the light shading parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area where each light through hole is located; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; and the side wall of the collimation hole is provided with a reflection unit.
2. The display panel according to claim 1, wherein the collimating hole unit further comprises an insulating layer; the insulating layers are positioned between two adjacent layers of the shading parts and between the shading parts and the fingerprint identification unit;
the insulating layer is provided with an annular through hole; the annular through hole is positioned in the surrounding area of the light through hole; the reflection unit is positioned in the annular through hole.
3. The display panel according to claim 1, wherein the reflection unit is perpendicular to a plane in which the first substrate base is located.
4. The display panel according to claim 1, wherein the reflection unit includes a first slope; the first inclined plane comprises a first top end and a first bottom end, and the first bottom end is positioned on one side, close to the fingerprint identification unit, of the first top end; the first top end is positioned on one side of the first bottom end away from the central axis of the collimation hole;
the included angle between the reflecting unit and the central axis of the collimating hole is a first included angle A, and A is more than 0 degree and less than or equal to 35 degrees.
5. The display panel according to claim 1, wherein the reflection unit includes a plurality of sub-reflection units in a direction perpendicular to the first substrate base;
at least part of the sub-reflecting units comprise second inclined planes;
the second inclined plane comprises a second top end and a second bottom end, and the second bottom end is positioned on one side, close to the fingerprint identification unit, of the second top end; the second top end is positioned on one side of the second bottom end, which is far away from the central axis of the collimation hole;
wherein, the included angle between at least part of the sub-reflection units and the central axis of the collimation hole is a first included angle A, and A is more than 0 degree and less than or equal to 35 degrees.
6. The display panel according to claim 1, wherein the reflection unit includes a third slope; the third inclined surface comprises a third top end and a third bottom end, and the third bottom end is positioned on one side, close to the fingerprint identification unit, of the third top end;
the third top end is located on one side of the third bottom end close to the central axis of the collimation hole, an included angle between the reflection unit and the central axis of the collimation hole is a second included angle B, and B is larger than 0 degree and is less than or equal to 50 degrees.
7. The display panel according to claim 1, wherein the reflection unit includes a plurality of sub-reflection units in a direction perpendicular to the first substrate base;
at least part of the sub-reflecting units comprise fourth inclined planes;
the fourth inclined plane comprises a fourth top end and a fourth bottom end, and the fourth bottom end is positioned on one side, close to the fingerprint identification unit, of the fourth top end;
the fourth top end is positioned at one side of the fourth bottom end close to the central axis of the collimation hole, the included angle between at least part of the sub-reflection units and the central axis of the collimation hole is a second included angle B, and B is more than 0 degree and less than or equal to 50 degrees.
8. The display panel according to claim 5 or 7, wherein an angle between the sub-reflection unit and a central axis of the collimating hole gradually decreases from the first substrate toward the fingerprint identification unit.
9. The display panel according to claim 5 or 7, wherein the tilt directions of adjacent sub-reflection units are opposite in a direction perpendicular to the first substrate base.
10. The display panel according to claim 1, wherein the reflection unit has a microstructure formed thereon.
11. The display panel according to claim 10, wherein the microstructures comprise raised structures and/or recessed structures.
12. The display panel according to claim 1, wherein the display panel comprises an array substrate, a liquid crystal layer and a color film substrate;
the liquid crystal layer is positioned between the color film substrate and the array substrate; at least one layer of shading part is arranged in the array substrate and/or the color film substrate.
13. The display panel according to claim 12, wherein one layer of the light-shielding portions in the color film substrate is multiplexed into a black matrix; the black matrix is provided with a plurality of pixel openings; a colored resistance layer is arranged in the pixel opening; the vertical projection of the fingerprint identification unit and the collimation hole unit on the plane of the first substrate base plate is not overlapped with the vertical projection of the pixel opening on the plane of the first substrate base plate.
14. A display device characterized by comprising the display panel according to any one of claims 1 to 13.
15. A method for manufacturing a display panel, comprising:
providing a first substrate base plate;
forming a plurality of fingerprint identification units on the first substrate;
forming a plurality of alignment hole units on one side of the fingerprint identification unit, which is far away from the first substrate base plate; the collimating hole unit comprises at least one layer of shading part; the shading part is provided with a light through hole; the light through holes of the light shading parts are at least partially overlapped in the vertical projection of the plane of the first substrate; forming a collimation hole in the area where each light through hole is located; the vertical projection of the collimation hole on the plane of the first substrate base plate is at least partially overlapped with the vertical projection of the fingerprint identification unit on the plane of the first substrate base plate; and the side wall of the collimation hole is provided with a reflection unit.
16. The method of claim 15, wherein the reflection unit includes a plurality of sub-reflection units in a direction perpendicular to the first substrate base plate;
forming a plurality of alignment hole units on one side of the fingerprint identification unit far away from the first substrate base plate, wherein the alignment hole units comprise:
forming a light shielding part and forming a light through hole on the light shielding part;
forming an insulating layer and forming a ring-shaped through hole on the insulating layer; the annular through hole is positioned in the surrounding area of the light through hole;
forming a reflecting layer and etching to form a sub-reflecting unit; the sub-reflecting units are positioned in the annular through holes;
and circularly executing the steps until a plurality of sub-reflecting units of the reflecting unit are formed.
CN202010075265.3A 2020-01-22 2020-01-22 Display panel, display device and preparation method of display panel Pending CN111240065A (en)

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