CN110164307B - Display device with built-in fingerprint identification inductor - Google Patents
Display device with built-in fingerprint identification inductor Download PDFInfo
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- CN110164307B CN110164307B CN201910435223.3A CN201910435223A CN110164307B CN 110164307 B CN110164307 B CN 110164307B CN 201910435223 A CN201910435223 A CN 201910435223A CN 110164307 B CN110164307 B CN 110164307B
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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
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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
- G02F1/1335—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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
Abstract
The embodiment of the invention provides a display device with a built-in fingerprint identification sensor, which comprises a plurality of shading layers and a light transmitting layer arranged between the shading layers; each shading layer is internally provided with a light hole, and the plurality of light holes form a collimation hole; the fingerprint identification sensor is arranged corresponding to the collimation hole; being provided with first printing opacity material and second printing opacity material in collimation hole, first printing opacity material is compared in second printing opacity material and is more close to fingerprint identification inductor one side to the refracting index of first printing opacity material is greater than the refracting index of second printing opacity material, makes the downthehole light of incidence to the collimation take place the polarization, thereby increases the receipts light yield that has fingerprint identification inductor under the light trap dislocation condition, improves the sensitivity of fingerprint identification inductor.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of fingerprint identification, in particular to a display device with a built-in fingerprint identification sensor.
[ background of the invention ]
For a display panel with a fingerprint identification function, in order to better realize a comprehensive screen design and avoid the occupation of a non-display area by a fingerprint identification area, a display area can be reused as the fingerprint identification area by adopting a fingerprint identification technology under a screen at present.
The underscreen fingerprint identification structure generally includes a collimating aperture and a fingerprint identification sensor disposed below the collimating aperture. The collimation hole is formed by arranging the light transmission hole in the multilayer light shielding layer, when the light shielding layer generates alignment deviation in patterning, the effective aperture of the collimation hole is reduced, the light receiving amount of the fingerprint identification sensor is reduced, and the sensitivity of the fingerprint identification sensor is reduced.
[ summary of the invention ]
In view of this, an embodiment of the present invention provides a display device with a fingerprint sensor built therein, including: a plurality of light-shielding layers and a light-transmitting layer provided between the light-shielding layers; each shading layer is internally provided with a light hole, and the plurality of light holes form a collimation hole; the fingerprint identification sensor is arranged corresponding to the collimation hole; and a first light-transmitting material and a second light-transmitting material are arranged in the collimation hole, the first light-transmitting material is positioned on one side of the second light-transmitting material close to the fingerprint identification sensor, and the refractive index of the first light-transmitting material is greater than that of the second light-transmitting material.
The invention also provides a display device with a built-in fingerprint identification sensor, which comprises a first substrate and a second substrate which are oppositely arranged, wherein a display material layer is arranged between the first substrate and the second substrate; the first substrate is provided with at least one first shading layer, and a first light hole is formed in the first shading layer; at least one second light shielding layer is arranged on the second substrate, and a second light hole is formed in the second light shielding layer; the first light hole and the second light hole form a collimation hole; the fingerprint identification sensor is positioned on the second substrate and corresponds to the collimation hole; the part of the collimation hole, which is positioned on the second substrate, is internally provided with a first light-transmitting material, the first light-transmitting material is positioned on one side of the display material layer, which is close to the fingerprint identification sensor, and the refractive index of the first light-transmitting material is greater than that of the display material layer.
According to the display device with the built-in fingerprint identification sensor, the first light-transmitting material is filled at one side, close to the fingerprint identification sensor, in the collimation hole, the second light-transmitting material is filled at one side, far away from the fingerprint identification sensor, in the collimation hole, the refractive index of the first light-transmitting material is larger than that of the second light-transmitting material, so that light rays incident into the collimation hole are refracted, the light receiving quantity of the fingerprint identification sensor under the condition that the light-transmitting holes are staggered is increased, and the sensitivity of the fingerprint identification sensor is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a display device with a fingerprint sensor built in according to an embodiment;
FIG. 2 is a schematic diagram illustrating light propagating in a collimating hole with a positional deviation of a light-transmitting hole according to an embodiment;
fig. 3 is a schematic view of a display device with a fingerprint sensor according to a second embodiment;
FIG. 4 is a schematic diagram illustrating the light propagating in the collimating holes with the position deviation of the light-transmitting holes according to the second embodiment;
fig. 5 is a schematic view of a liquid crystal display device with a fingerprint sensor according to a third embodiment.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe pixel groups in embodiments of the present invention, the pixel groups should not be limited to these terms. These terms are only used to distinguish groups of pixels from each other.
Example one
Referring to fig. 1, a schematic view of a display device with a fingerprint sensor according to an embodiment of the present invention includes a substrate 10, a plurality of light shielding layers 11 disposed on the substrate 10, and a light transparent layer 12 disposed between the light shielding layers 11. Each light shield layer 11 is provided with a light hole, a plurality of light holes form a collimation hole 13, and the fingerprint identification sensor 14 is arranged corresponding to the collimation hole 13.
A first light transmissive material 15 and a second light transmissive material 16 are arranged within the collimating hole 13, the first light transmissive material 15 being located on a side of the second light transmissive material 16 closer to the fingerprint recognition sensor 14, and a refractive index n1 of the first light transmissive material 15 being greater than a refractive index n2 of the second light transmissive material 16.
The collimating hole 13 transmits the light reflected from the finger to the fingerprint sensor 14, and the fingerprint sensor 14 detects and identifies the light transmitted from the collimating hole 13. The plurality of light-shielding layers 11 are stacked such that the plurality of light-transmitting holes overlap to form the collimating holes 13, and the plurality of light-shielding layers 11 are formed by deposition and patterning processes, respectively, using a material generally made of black resin. In the patterning process, a photoresist layer is formed on the black resin deposited on the whole surface to form a film, the photoresist layer is subjected to exposure, development and patterning by using a mask plate, and then the patterned photoresist layer is used as a mask to etch the black resin deposited on the whole surface to form a film, so that a patterned light shielding layer 11 is formed. When the mask board counterpoint has the deviation, the light trap position of light shield layer 11 of patterning will have the deviation, can reduce the whole effective aperture of collimation hole 13, has reduced the volume of the light that collimation hole 13 can receive promptly.
In the present invention, a first light transmissive material 15 with a larger refractive index n1 is filled in one side of the collimating hole 13 close to the fingerprint identification sensor 14, and a second light transmissive layer 16 with a smaller refractive index n2 is filled in the upper portion of the first light transmissive material 15, as shown in fig. 2, which is a schematic diagram of light propagating in the collimating hole 13 with the position deviation of the light transmissive hole, when the light a enters the first light transmissive material 15 with a larger refractive index from the second light transmissive material 16 with a smaller refractive index at a certain incident angle θ 1, the light a is refracted, and the refracted light B propagates in the direction of a refraction angle θ 2, because the refractive index n1 of the first light transmissive material 15 is larger than the refractive index n2 of the second light transmissive material 16, and the refraction angle θ 2 is smaller than the incident angle θ 1, the refracted light B can be received by the fingerprint identification sensor 14 due to the change of the propagation direction. In contrast, as shown in fig. 2, the light ray B 'is a light ray supposed to propagate along the propagation direction of the original light ray a, and if the refractive indexes of the first light-transmitting material 15 and the second light-transmitting material 16 are the same, the light ray B' does not change the propagation direction in the first light-transmitting material 15 and the second light-transmitting material 16, and will exit the range of the collimating hole 13 and be shielded by the light shielding layer 11 with a position deviation, thereby causing a loss of the light receiving amount of the fingerprint sensor 14 and reducing the sensitivity of the fingerprint sensor 14.
Alternatively, the refractive index n1 of the material of the second light-transmitting material 16 may be set to be 1.5 or less, and the refractive index n1 of the first light-transmitting material 15 may be set to be greater than 1.5.
Referring to fig. 1, in the first embodiment, the material of the light-transmitting layer 12 is a polyester-imide coating, and the material of the second light-transmitting material 16 may be the same as the material of the light-transmitting layer 12. After the light-transmitting hole is patterned in the light-shielding layer 11, the light-transmitting layer 12 is formed on the patterned light-shielding layer 11, and the light-transmitting hole is filled with a polyester-imide resin as the second light-transmitting material 16 along with the light-transmitting layer 12. The material of the second light-transmitting material 16 and the material of the light-transmitting layer 12 are the same, and can be formed at the same time, the manufacturing process is simple, and the refractive index of the polyester-imide resin is 1.5 or less, and is suitable as the material of the second light-transmitting material 16.
Alternatively, the material of the second light-transmitting material 16 may be different from the material of the light-transmitting layer 12, the light-transmitting layer 12 is formed on the patterned light-shielding layer 11, the light-transmitting layer 12 is also filled in the light-transmitting hole at the same time of formation, and then the light-transmitting layer 12 in the straight hole 13 is etched and removed, and then the second light-transmitting material 16 is filled. When the material of the second light-transmitting material 16 is different from the material of the light-transmitting layer 12, the material selection range of the second light-transmitting material 16 is wider while the thickness and performance of the light-transmitting layer 12 are not affected.
The first light-transmitting material 15 may be a mixture of TiO2Or ZrO2Polyimide with high refractive index nano TiO2Or ZrO2As an inorganic filler, a polyimide is compounded, and a polyimide coating having both a good refractive index and excellent transparency can be obtained, and the refractive index can be between 1.63 and 1.68. For example, for a polyimide film having a thickness of about 25 μm, the polyimide film without added TiO2 is almost completely transparent, and after the nano TiO2 is added, the transparency of the polyimide nanocomposite film can be well maintained at a TiO2 content of less than 15% by mass.
The first light-transmitting material 15 may also be polyimide prepared from an aromatic diamine compound or an aromatic dianhydride, and may have a transmittance of 1.69 to 1.72, while having high transparency.
In the structure shown in fig. 1, 4 light-shielding layers 11 and 4 light-transmitting layers 12 are included, but the present invention is not limited thereto, and the number of layers of the light-shielding layers and the light-transmitting layers may be set according to the structural requirements of the collimating holes.
According to the display device with the built-in fingerprint identification sensor provided by the embodiment of the invention, the first light-transmitting material is filled at one side close to the fingerprint identification sensor in the collimation hole, and the second light-transmitting material is filled at one side far away from the fingerprint identification sensor in the collimation hole, so that light rays are refracted, the light receiving quantity of the fingerprint identification sensor under the condition of dislocation of the light-transmitting holes is increased, and the sensitivity of the fingerprint identification sensor is improved.
Example two
Referring to fig. 3, fig. 3 is a schematic view of a display device with a fingerprint sensor according to a second embodiment of the present invention, and as shown in the figure, the display device 20 with a fingerprint sensor includes a first substrate 201 and a second substrate 202 disposed opposite to each other. A light-transmitting intermediate layer 26 is provided between the first substrate 201 and the second substrate 202, and the light-transmitting intermediate layer 26 corresponds to a light-transmitting layer between the light-shielding layers.
The plurality of light-shielding layers include a first light-shielding layer 211 disposed on the first substrate 201 and a second light-shielding layer 212 disposed on the second substrate 202. A first light hole is formed in the first light shielding layer 211, a second light hole is formed in the second light shielding layer 212, and the first light hole and the second light hole form the collimation hole 23. That is, the collimating holes 23 include a portion disposed on the first substrate 201 and a portion disposed on the second substrate 202, the portion of the collimating holes 23 disposed on the first substrate 201 is composed of a first light-transmitting hole disposed on the first substrate 201, and the portion of the collimating holes 23 disposed on the second substrate 202 is composed of a second light-transmitting hole disposed on the second substrate 202.
The fingerprint sensor 24 and the collimating hole 23 are disposed correspondingly, specifically, the fingerprint sensor 24 is disposed on the second substrate 202 and below the second light shielding layer 212.
The collimating aperture 23 is provided with a first light transmissive material 25 in a portion of the second substrate 202, the light transmissive intermediate layer 26 is a second light transmissive material, the first light transmissive material 25 is closer to the side of the fingerprint recognition sensor 24 than the light transmissive intermediate layer 26, and the refractive index n1 of the first light transmissive material 25 is greater than the refractive index n2 of the light transmissive intermediate layer 26.
In the second embodiment, the first light-shielding layer 211 and the second light-shielding layer 212 are respectively disposed on the first substrate 201 and the second substrate 202, and the misalignment between the first light-shielding layer 211 and the second light-shielding layer 212 may be caused by the misalignment when the first substrate 201 and the second substrate 202 are aligned and attached. When the first substrate 201 and the second substrate 202 are misaligned, because the refractive index n1 of the first light-transmitting material 25 of the collimating hole 23 located in the portion of the second substrate 202 is greater than the refractive index n2 of the light-transmitting intermediate layer 26, the light incident on the first light-transmitting material 25 from the light-transmitting intermediate layer 26 is refracted, and the refraction angle is smaller than the incidence angle, and the refracted light can be received by the fingerprint sensor 24, so that the light receiving amount of the fingerprint sensor 24 in the case of misalignment of the light-transmitting holes is increased, and the sensitivity of the fingerprint sensor 24 is improved.
Alternatively, the refractive index n2 of the material of the light-transmitting intermediate layer 26 may be set to be 1.5 or less, and the refractive index n1 of the first light-transmitting material 25 may be set to be greater than 1.5.
Alternatively, the first light-transmitting material 25 may be mixed with TiO2Or ZrO2Polyimide of (2) in high yieldNano TiO of refractive index2Or ZrO2As an inorganic filler, a polyimide is compounded, and a polyimide coating having both a good refractive index and excellent transparency can be obtained, and the refractive index can be between 1.63 and 1.68. For example, for a polyimide film having a thickness of about 25 μm, the polyimide film without added TiO2 is almost completely transparent, and after the nano TiO2 is added, the transparency of the polyimide nanocomposite film can be well maintained at a TiO2 content of less than 15% by mass. The first light transmitting material 25 may also be polyimide prepared by an aromatic diamine compound or an aromatic dianhydride, and the transmittance thereof may reach 1.69 to 1.72.
Optionally, the aperture of the collimating holes 23 is 4-5 μm. The value of the misalignment between the first substrate 201 and the second substrate 202 is generally about 2 μm, and the ratio of the misalignment to the aperture of the collimating hole 23 is about 1/2, and if the collimating structure in the prior art is used, the light receiving amount of the fingerprint sensor will be reduced by 50%, whereas the light receiving amount of the fingerprint sensor in the display device provided by the second embodiment of the present invention is reduced by far less than 50%.
Alternatively, in the structure shown in fig. 3, a plurality of first light-shielding layers 211 are provided on the first substrate 201, the light-transmitting layer 222 is provided between the plurality of first light-shielding layers 211, and one second light-shielding layer 212 is provided on the second substrate 202, but the present invention is not limited thereto, and a plurality of second light-shielding layers 212 may be provided on the second substrate 202.
Optionally, the collimating hole 23 is provided with a third light transmissive material 27 and a fourth light transmissive material 28 in the portion on the first substrate 201, the third light transmissive material 27 is located on the side of the fourth light transmissive material 28 closer to the fingerprint recognition sensor 24, and the refractive index n3 of the third light transmissive material 27 is greater than the refractive index n4 of the fourth light transmissive material 28.
As shown in the figure, a plurality of first light-shielding layers 211 are disposed on the first substrate 201, a light-transmitting layer 222 is disposed between the plurality of light-shielding layers 211, only one second light-shielding layer 212 is disposed on the second substrate 202, and the depth of the part of the alignment hole 23 located on the first substrate 201 is greater than the depth of the alignment hole 23 located on the second substrate 202. If the first substrate 201 and the second substrate 202 are misaligned, light may be difficult to propagate through the portion of the collimating hole 23 located on the first substrate 201 to the portion located on the second substrate 202. In addition, the light-transmitting intermediate layer 26 may be a display material layer, and in the case where the light-transmitting intermediate layer 26 is a display material layer, the light-transmitting intermediate layer 26 is disposed in an entire layer, and a material cannot be replaced in the collimating hole 23 as required. Whereas if the refractive index n2 of the display material layer is less than the refractive index n3 of the third light transmissive material 27, the light rays propagating from the third light transmissive material 27 to the display material layer 26 will be more severely deflected towards the outside of the collimating aperture 23 according to the law of refraction and the angle of refraction is greater than the angle of incidence, reducing the amount of light received by the fingerprint sensor 24. Furthermore, there may be a misalignment between the plurality of first light-shielding layers 211 disposed on the first substrate 201, so that the light passing through the portion of the collimating hole 23 on the first substrate 201 is reduced, and the light-receiving amount of the fingerprint sensor 24 is also affected.
Fig. 4 is a schematic diagram illustrating the light propagating in the collimating hole with the position deviation of the light transmitting hole in the second embodiment, as shown in fig. 4, the light a propagating in the fourth light transmitting material 28 enters the third light transmitting material 27, because the refractive index n3 of the third light transmitting material 27 is greater than the refractive index n4 of the fourth light transmitting material 28, so the refraction angle is greater than the incident angle, and the light B changes the original propagation direction. Next, in the light-transmitting intermediate layer 26 as the second light-transmitting material, the light ray C propagating in the light-transmitting intermediate layer 26 is deflected toward the original direction as compared with the light ray B, on the assumption that the refractive index n2 of the light-transmitting intermediate layer 26 is smaller than the refractive index n3 of the third light-transmitting material 27 and the refraction angle is smaller than the incident angle. Next, the light ray C propagating in the light-transmitting intermediate layer 26 enters the first light-transmitting material 25 because the refractive index n1 of the first light-transmitting material 25 is greater than the refractive index n2 of the light-transmitting intermediate layer 26, the refraction angle is smaller than the incident angle, and the light ray D is deflected toward another direction with respect to the light ray C, which is a direction closer to the center of the collimating hole 23. If the refractive index of the material of the collimating hole 23 in the portion of the first substrate 201 is the same, the light ray a may be blocked by the second light shielding layer 212 on the second substrate 202 and cannot be received by the fingerprint sensor 24 because the collimating hole 23 is deeper on the first substrate 201; alternatively, when the light ray a enters the light-transmitting intermediate layer 26 with a smaller refractive index, the light ray a is blocked by the second light-shielding layer 212 and cannot be received by the fingerprint sensor 24. In an alternative embodiment of the second embodiment, a third light transmissive material 27 and a fourth light transmissive material 28 are disposed in the portion of the collimation hole 23 located on the first substrate 201, the third light transmissive material 27 is closer to the fingerprint identification sensor 24 than the fourth light transmissive material 28, and the refractive index n3 of the third light transmissive material 27 is greater than the refractive index n4 of the fourth light transmissive material 28, so that the light receiving amount of the fingerprint identification sensor 24 can be increased.
EXAMPLE III
Fig. 5 is a schematic view of a display device with a fingerprint sensor according to a third embodiment, and as shown in fig. 5, a display device 30 includes: a first substrate 301 and a second substrate 302 arranged opposite to each other, and a display material layer 303 is arranged between the first substrate 301 and the second substrate 302. The first substrate 301 has at least one first light shielding layer 311, the first light shielding layer 311 has a first light hole therein, the second substrate 302 has at least one second light shielding layer 312 thereon, and the second light shielding layer 312 has a second light hole therein. The first light-transmitting hole and the second light-transmitting hole constitute a collimating hole 33. The fingerprint sensor 34 is disposed on the second substrate 302 corresponding to the alignment hole 33, and specifically, the fingerprint sensor 34 is disposed on the second substrate 302 and located on a side of the second light shielding layer 312 away from the first substrate 301.
The collimating aperture 33 is provided with a first light transmissive material 35 in the portion of the second substrate 302, the first light transmissive material 35 is located on the side of the display material layer 303 closer to the fingerprint recognition sensor 34, and the refractive index n1 of the first light transmissive material 35 is greater than the refractive index n2 of the display material layer 303.
When the first substrate 301 and the second substrate 302 of the display device 30 are misaligned, the effective aperture of the collimating hole 33 is reduced. When the light passing through the display material layer 303 enters the first light transmissive material 35, since the refractive index n1 of the first light transmissive material 35 is greater than the refractive index n2 of the display material layer 303, the light will be refracted, and the refraction angle is smaller than the incident angle, and the light entering the first light transmissive material 35 has a direction close to the center of the fingerprint identification sensor 34 compared to the light propagating in the display material layer 303, so that the probability that the light is blocked by the second light blocking layer 312 is reduced, and the light receiving amount of the fingerprint identification sensor 34 is increased.
Alternatively, in one embodiment, the display device is a liquid crystal display device, the first substrate 301 is a color film substrate on which the color filter layer 36 is disposed, the second substrate 302 is an array substrate, the fingerprint sensor 34 is integrated on the array substrate, and the display material layer 303 is a liquid crystal layer. In the above embodiment, the refractive index n1 of the first light transmitting material 35 is larger than the refractive index n2 of the liquid crystal layer 303. However, the present invention is not limited thereto, and the display device may be other types of display devices, for example, the display device may be an organic light emitting display device, and the display material layer may be an organic light emitting material layer.
Alternatively, in one embodiment, a plurality of first light-shielding layers 311 are provided on the first substrate 301, and a light-transmitting layer 313 is provided between adjacent first light-shielding layers 311.
Optionally, in one embodiment, the collimating hole 33 is provided with a third light transmissive material 37 and a fourth light transmissive material 38 in the portion thereof located on the first substrate 301, the third light transmissive material 37 is located on the side of the fourth light transmissive material 38 closer to the fingerprint identification sensor 34, and the refractive index n3 of the third light transmissive material 37 is greater than the refractive index n4 of the fourth light transmissive material 38. When the first light-shielding layer 311 forming the part of the collimating hole 33 on the first substrate 301 is shifted in position, or when the depth of the part of the collimating hole 33 on the first substrate 301 is deeper, or when the refractive index of the display material layer 303 is smaller, the above arrangement can further improve the problem of the reduction of the light receiving amount of the first substrate 301 and the second substrate 302 due to the alignment deviation, and further improve the light receiving amount of the fingerprint identification sensor 34, specifically, refer to the description related to the second embodiment.
Optionally, in one embodiment, the refractive index of the fourth light transmissive material 38 is equal to or less than 1.5, and the refractive index of the third light transmissive material 37 is greater than 1.5.
Alternatively, in one embodiment, the third light transmissive material 37 and the first light transmissive material 35 are the same, and may be polyimide mixed with TiO2 or ZrO2, nano TiO2 or ZrO2 with high refractive index is used as an inorganic filler, and the polyimide is compounded to obtain a polyimide coating with good refractive index and excellent transparency, and the refractive index may be between 1.63 and 1.68. For example, for a polyimide film having a thickness of about 25 μm, the polyimide film without added TiO2 is almost completely transparent, and after the nano TiO2 is added, the transparency of the polyimide nanocomposite film can be well maintained at a TiO2 content of less than 15% by mass. The first and third light transmitting materials 35 and 37 may also be polyimide prepared by an aromatic diamine compound or an aromatic dianhydride, and the transmittance thereof may reach 1.69 to 1.72.
The operating principle of fingerprint identification inductor does, when pointing to touch display device, the light source takes place the reflection when shining on valley line and the crest line of finger fingerprint, because the reflection angle of valley line and crest line and the illumination intensity that the reflection goes back are different, throws light to the fingerprint identification inductor on, the fingerprint identification inductor passes through fingerprint signal line transmission to fingerprint identification signal receiving element with received sensing signal to make fingerprint identification signal receiving element discern the valley line and the crest line of fingerprint according to received signal. In the display device with the built-in fingerprint identification sensor, the first light-transmitting material is filled at one side close to the fingerprint identification sensor in the collimation hole, the second light-transmitting material is filled at one side far away from the fingerprint identification sensor in the collimation hole, and the refractive index of the first light-transmitting material is larger than that of the second light-transmitting material, so that light incident into the collimation hole is refracted, the light receiving quantity of the fingerprint identification sensor under the condition of dislocation of the light-transmitting holes is increased, and the sensitivity of the fingerprint identification sensor is improved.
The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A display device with a built-in fingerprint recognition sensor, comprising:
a plurality of light-shielding layers and a light-transmitting layer provided between the light-shielding layers; each shading layer is internally provided with a light hole, and the plurality of light holes form a collimation hole;
the fingerprint identification sensor is arranged corresponding to the collimation hole;
a first light-transmitting material and a second light-transmitting material are arranged in the collimation hole, the first light-transmitting material is positioned on one side, close to the fingerprint identification sensor, of the second light-transmitting material, and the refractive index of the first light-transmitting material is larger than that of the second light-transmitting material;
the substrate comprises a first substrate and a second substrate which are oppositely arranged;
the fingerprint identification sensor is arranged on the second substrate;
the plurality of shading layers comprise at least one first shading layer and at least one second shading layer; the first light shielding layer is arranged on the first substrate, and the second light shielding layer is arranged on the second substrate;
the light-transmitting layer is arranged between the first substrate and the second substrate;
the first light-transmitting material is arranged in the part, located in the second substrate, of the collimation hole.
2. The fingerprint recognition sensor-built-in display device according to claim 1, wherein the second light-transmissive material and the light-transmissive layer are the same material.
3. The fingerprint recognition sensor-built-in display device according to claim 1, wherein the refractive index of the second light-transmitting material is 1.5 or less, and the refractive index of the first light-transmitting material is more than 1.5.
4. The fingerprint recognition sensor-built display device according to claim 3, wherein the refractive index of said first light transmissive material is less than 1.72.
5. The display device with built-in fingerprint sensor according to claim 1, wherein the aperture of the collimating hole is 4-5 μm.
6. The fingerprint sensor-built-in display device according to claim 1, wherein the second light-transmitting material is a polyester-imide resin; the first light-transmitting material is mixed with TiO2Or ZrO2Or a polyimide prepared by an aromatic diamine compound or an aromatic dianhydride.
7. The fingerprint recognition sensor-embedded display device according to claim 1, wherein the collimating hole is provided with a third light transmissive material and a fourth light transmissive material in a portion of the first substrate, the third light transmissive material is located on a side of the fourth light transmissive material close to the fingerprint recognition sensor, and a refractive index of the third light transmissive material is greater than a refractive index of the fourth light transmissive material.
8. The fingerprint recognition sensor-built-in display device according to claim 7, wherein the first light transmissive material and the third light transmissive material are the same.
9. The fingerprint recognition sensor-built-in display device according to claim 7, wherein a refractive index of the fourth light-transmitting material is 1.5 or less, and a refractive index of the third light-transmitting material is 1.5 or more.
10. A display device with a built-in fingerprint identification sensor is characterized by comprising a first substrate and a second substrate which are oppositely arranged, wherein a display material layer is arranged between the first substrate and the second substrate;
the first substrate is provided with at least one first shading layer, and a first light hole is formed in the first shading layer; at least one second light shielding layer is arranged on the second substrate, and a second light hole is formed in the second light shielding layer;
the first light hole and the second light hole form a collimation hole;
the fingerprint identification sensor is positioned on the second substrate and corresponds to the collimation hole;
the collimating hole is provided with a first light-transmitting material in the part of the second substrate, the first light-transmitting material is positioned on one side of the display material layer close to the fingerprint identification sensor, and the refractive index of the first light-transmitting material is greater than that of the display material layer.
11. The fingerprint recognition sensor-embedded display device according to claim 10, wherein the collimating hole is provided with a third light transmissive material and a fourth light transmissive material in a portion of the first substrate, the third light transmissive material is located on a side of the fourth light transmissive material close to the fingerprint recognition sensor, and a refractive index of the third light transmissive material is greater than a refractive index of the fourth light transmissive material.
12. The fingerprint recognition sensor-built-in display device according to claim 11, wherein the first light transmissive material and the third light transmissive material are the same.
13. The display device with the built-in fingerprint sensor according to claim 10, wherein the display device is a liquid crystal display device, the first substrate is a color film substrate, the second substrate is an array substrate, and the display material layer is a liquid crystal layer.
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| CN201910435223.3A CN110164307B (en) | 2019-05-23 | 2019-05-23 | Display device with built-in fingerprint identification inductor |
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| CN201910435223.3A CN110164307B (en) | 2019-05-23 | 2019-05-23 | Display device with built-in fingerprint identification inductor |
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| CN110164307B true CN110164307B (en) | 2021-01-26 |
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| CN110928020B (en) * | 2019-12-19 | 2022-05-03 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110908174B (en) * | 2019-12-26 | 2022-09-20 | 厦门天马微电子有限公司 | Display panel and display device |
| CN111626100B (en) * | 2020-03-26 | 2024-02-02 | 天津极豪科技有限公司 | Under-screen fingerprint device and display module |
| CN112215152B (en) * | 2020-10-13 | 2023-10-03 | 业泓科技(成都)有限公司 | Display device with fingerprint identification module |
| CN112864182B (en) * | 2021-01-12 | 2022-10-11 | 厦门天马微电子有限公司 | Photosensitive module and display device |
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