CN110991323A - Display panel and display device - Google Patents

Abstract

The embodiment of the invention discloses a display panel and a display device. The display panel includes: the array substrate and the light-emitting unit are positioned on the array substrate; the fingerprint identification unit is positioned on one side of the array substrate, which is far away from the light-emitting unit; the first lens group comprises a plurality of first lenses which are arranged in a stacking mode in the direction perpendicular to the display panel, the first lens group is arranged corresponding to the area between the adjacent light-emitting units, and the first lens group is used for converging light rays reflected by the touch main body to the corresponding fingerprint identification unit. According to the embodiment of the invention, the first lens group is additionally arranged, so that the wiring change of the original array substrate is reduced on the basis of enhancing the sensitivity of fingerprint identification, and the wiring design of the array substrate is simplified.

Description

Display panel and display device

Technical Field

The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.

Background

With the continuous development of science and technology, smart phones are more and more widely applied to human daily life, and display panels are more and more important as important components of smart phones. Under-screen fingerprint recognition is currently the most popular biometric technology, and the application proportion in display panels is gradually increasing. However, the sensitivity of the existing display panel using the off-screen fingerprint recognition is low.

Disclosure of Invention

The embodiment of the invention provides a display panel and a display device, which are used for improving the sensitivity of fingerprint identification of the display panel.

In order to achieve the technical purpose, the embodiment of the invention provides the following technical scheme:

a display panel, comprising:

the array substrate and the light-emitting unit are positioned on the array substrate;

the fingerprint identification unit is positioned on one side of the array substrate, which is far away from the light-emitting unit;

the first lens group comprises a plurality of first lenses which are arranged in a stacking mode in the direction perpendicular to the display panel, the first lens group is arranged corresponding to the area between the adjacent light-emitting units, and the first lens group is used for converging the light rays reflected by the touch main body to the corresponding fingerprint identification unit.

According to the technical scheme, the plurality of first lenses in the first lens group are arranged in a stacked mode in the direction perpendicular to the display panel, so that the plurality of first lenses can sequentially and respectively converge the fingerprint reflection light. Compared with the prior art, the fingerprint identification method and the fingerprint identification device have the advantages that the fingerprint reflection light rays are prevented from irradiating opaque film layer structures (such as metal wiring and metal electrodes), so that the fingerprint reflection light rays can pass through the opaque film layer structures, the loss and scattering of the fingerprint reflection light rays can be reduced, and the fingerprint identification sensitivity is enhanced. In addition, the number of the first lenses in the first lens group is multiple (namely, at least two), so that the advantage of the arrangement is that the multiple first lenses can respectively and sequentially converge the fingerprint reflected light, and when the multiple first lenses are arranged, the sizes of the first lenses can be different. Therefore, the arrangement mode of the plurality of first lenses is more flexible, the space of the display panel occupied by the first lens group is reduced, and the simplification of the wiring of the array substrate is facilitated. In summary, the first lens group is additionally arranged, so that wiring change of an original array substrate is reduced on the basis of enhancing sensitivity of fingerprint identification, and wiring design of the array substrate is simplified.

Optionally, the plurality of first lenses constitute a part of an insulating layer in the display panel. The arrangement is equivalent to the multiplexing of the insulating layer in the display panel as the film layer for arranging the first lens, so that a new film layer does not need to be additionally arranged for the first lens group, and the thickness of the display panel is favorably thinned.

Optionally, the insulating layer comprises an intermediate insulating layer, a pixel defining layer or a planarization layer in the display panel. The reason for this is that, on one hand, the thicknesses of the intermediate insulating layer, the pixel defining layer, the planarization layer and the support column layer are relatively thick, and accordingly, the thickness of the first lens which can be arranged is relatively thick, so that the convergence capability of the first lens on the fingerprint reflected light rays is enhanced; on the other hand, unlike the gate insulating layer and the capacitor insulating layer, the thin film transistor on the array substrate is not affected by the first lens formed on the intermediate insulating layer, the pixel defining layer, the planarization layer, the support pillar layer, and the like, and the characteristics of the thin film transistor may be affected by the unevenness of the first lens formed on the gate insulating layer, the capacitor insulating layer, and the like. Therefore, the embodiment of the invention improves the converging effect of the first lens on the fingerprint reflected light on the premise of ensuring that the performance of the thin film transistor is not influenced.

Optionally, the first lens is a convex lens, so that the first lens group has a better convergence effect on the fingerprint reflection light.

Optionally, at least one of the first lenses is a fresnel lens, wherein the fresnel lens is one of convex lenses, and the fresnel lens has the characteristics that a plurality of small convex lenses are mutually nested and annual rings are distributed. The Fresnel lens adopted by the embodiment of the invention has the concentrated and uniform light condensation effect, and is beneficial to reducing mirror reflection, thereby being beneficial to further improving the sensitivity of fingerprint identification.

Optionally, the display panel further comprises: the light absorption structure is positioned in a display area on one side, far away from the light emitting unit, of the array substrate and is used for absorbing light rays emitted by the light emitting unit and irradiated to the light absorption structure through the first lens. According to the embodiment of the invention, the first lens group is arranged, so that light rays emitted by the light emitting unit can be converged on the light absorbing structure, and the light rays emitted by the light emitting unit are prevented from irradiating the thin film transistor. The first lens group arranged in the embodiment of the invention can not only converge the fingerprint reflected light to the fingerprint identification unit, but also converge the light emitted by the light emitting unit to the light absorbing structure, namely, the embodiment of the invention reduces the characteristic drift of the thin film transistor on the basis of improving the sensitivity of fingerprint identification.

Optionally, the fingerprint identification unit corresponds the setting with the trompil that absorbs light structure formation to make fingerprint reflection light can shine on the fingerprint identification unit.

Optionally, the light absorbing structure is a composite tape. The composite adhesive tape is black in color and can absorb light irradiated on the composite adhesive tape. The embodiment of the invention arranges the composite adhesive tape as the light absorption structure without additionally arranging the light absorption structure, thereby being beneficial to the lightness and thinness of the display panel.

Optionally, the array substrate includes a substrate and a metal reflection structure located on a side of the substrate away from the fingerprint identification unit and corresponding to the display area;

the display panel further includes:

the second lens group is located between the metal reflection structure and the fingerprint identification unit and corresponds to the area where the fingerprint identification unit is located, and the second lens group is used for converging external environment light to the metal reflection structure.

The metal reflective structure may be, for example, a metal trace or a metal electrode. The second lens group is arranged in the embodiment of the invention, so that the external environment light can be converged on the metal layer (such as the source drain layer), the metal layer (such as the source drain layer) reflects the external environment light, and the reflected external environment light is still emitted from the opening due to reversibility of the light path, so that the second lens group plays a role in offsetting the external environment light, and is beneficial to preventing the external environment light from being emitted from the light emitting side of the display panel, thereby improving the display quality of the display panel.

Optionally, the display panel further includes a support film located between the array substrate and the fingerprint identification unit, and at least one of the second lenses is formed by the substrate or the support film. The arrangement is favorable for lightening and thinning the display panel, the cost for additionally manufacturing the second lens is saved, the second lens and the display panel do not need to be aligned, and the process difficulty is favorably reduced.

Optionally, the vertical projection of the second lens group on the substrate covers the corresponding vertical projection of the fingerprint identification unit on the substrate, which is beneficial to increase the amount of the external environment light irradiated on the second lens group, thereby further enhancing the effect of offsetting the external environment light.

Optionally, the second lens is a convex lens. Wherein, convex lens have the effect of assembling to external environment light, are convex lens with each second lens for second battery of lens is better to external environment light's the effect of assembling.

Optionally, at least one of the second lenses is a fresnel lens, and the fresnel lens has a concentrated and uniform light condensing effect, so that the reduction of mirror reflection is facilitated, and the effect of the second lens group on counteracting external environment light is further improved.

Optionally, the display panel further comprises: the third lens group is located on one side, away from the array substrate, of the light emitting unit, at least part of the light emitting units are correspondingly provided with the third lens, and the third lens group is used for converging light rays emitted by the corresponding light emitting units to the touch main body. The embodiment of the invention is arranged in such a way, so that the intensity of light rays irradiating the touch main body is enhanced, the intensity of the reflected light rays of the fingerprint is further enhanced, and the sensitivity of fingerprint identification is further improved.

Optionally, the display panel further comprises: the touch substrate is positioned on one side, away from the array substrate, of the light emitting unit, the touch substrate comprises at least one touch insulating layer, and the third lens is formed by the touch insulating layer. The arrangement is favorable for lightening and thinning the display panel, the cost for additionally manufacturing the third lens is saved, the third lens and the display panel do not need to be aligned, and the process difficulty is favorably reduced.

Optionally, the third lens is a convex lens. The convex lenses have a convergence effect on light rays emitted by the light emitting units, and each third lens is a convex lens, so that the convergence effect of the third lens group on light rays of the external environment is better.

Optionally, at least one of the third lenses is a fresnel lens, and the fresnel lens has a concentrated and uniform light condensing effect, so that specular reflection can be reduced, and further improvement of the effect of the third lens group on light rays emitted by the light emitting unit can be facilitated.

Accordingly, the present invention also provides a display device comprising: the display panel provided by any embodiment of the invention.

Correspondingly, the invention also provides a manufacturing method of the display panel, which comprises the following steps:

depositing the insulating layer, etching the insulating layer, and forming a first lens in an area between the corresponding adjacent light emitting units; wherein the insulating layer comprises an intermediate insulating layer, a pixel defining layer, or a planarization layer in the display panel;

repeating the step of depositing the insulating layer to form a plurality of first lenses; the first lenses are arranged in a stacking mode along the direction perpendicular to the display panel to form a first lens group; the first lens group is used for converging light rays reflected by the touch main body to the corresponding fingerprint identification unit.

According to the embodiment of the invention, the plurality of first lenses in the first lens group are arranged in a stacking manner along the direction vertical to the display panel, so that the plurality of first lenses can sequentially and respectively converge the fingerprint reflection light. Compared with the prior art, the fingerprint identification method and the fingerprint identification device have the advantages that the fingerprint reflection light rays are prevented from irradiating opaque film layer structures (such as metal wiring and metal electrodes), so that the fingerprint reflection light rays can pass through the opaque film layer structures, the loss and scattering of the fingerprint reflection light rays can be reduced, and the fingerprint identification sensitivity is enhanced. In addition, the number of the first lenses in the first lens group is multiple (namely, at least two), so that the advantage of the arrangement is that the multiple first lenses can respectively and sequentially converge the fingerprint reflected light, and when the multiple first lenses are arranged, the sizes of the first lenses can be different. Therefore, the arrangement mode of the plurality of first lenses is more flexible, the space of the display panel occupied by the first lens group is reduced, and the simplification of the wiring of the array substrate is facilitated. In summary, the first lens group is additionally arranged, so that wiring change of an original array substrate is reduced on the basis of enhancing sensitivity of fingerprint identification, and wiring design of the array substrate is simplified.

Drawings

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural diagram of another display panel 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 diagram of a first lens element according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view taken along line B-B in FIG. 6;

fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 9 is a characteristic diagram of a thin film transistor 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 cross-sectional view taken along line C-C of FIG. 13;

fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 16 is a schematic view of a film structure formed in each step of a method for manufacturing a display panel according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As described in the background art, the conventional display panel has a technical problem that the sensitivity of the identification of the finger print under the screen is low. The inventors studied this technical problem, and the following explains an analysis process in which the inventors studied this technical problem. The basic principle of the under-screen fingerprint technology is that when a touch subject (such as a finger) touches a screen, light emitted by a display panel penetrates through a cover plate to illuminate fingerprint textures, and fingerprint reflected light penetrates through the display panel to return to a fingerprint identification unit, so that a fingerprint image is finally formed for identification. The inventor researches and discovers that the main reason that the sensitivity of the fingerprint identification under the screen is low is that each film layer of the display panel is provided with an opaque film layer structure, such as a metal wire or a metal electrode, and part of the fingerprint reflected light irradiates on the opaque film layer structure, so that the loss of the part of light rays in the fingerprint identification light rays is caused. Therefore, in the prior art, the intensity of the reflected light of the fingerprint received by the fingerprint identification unit is low, resulting in low sensitivity of fingerprint identification.

In view of the above, embodiments of the present invention provide a Display panel, which may be, for example, an Organic Light-Emitting Diode Display panel (OLED) or a Micro Light-Emitting Diode Display panel (Micro LED). Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a cross section along a-a in fig. 1. Referring to fig. 1 and 2, the display panel includes: the lens comprises an array substrate 100, a light emitting unit 200 positioned on the array substrate 100, a fingerprint identification unit 300 and a first lens group 400. The fingerprint identification unit 300 is located on a side of the array substrate 100 away from the light emitting unit 200, and the fingerprint identification unit 300 is used for performing fingerprint identification according to light reflected to the fingerprint identification unit 300 by a touch subject (e.g., a finger). A plurality of sets of first lens groups 400, the first lens groups 400 including a plurality of first lenses (fig. 1 exemplarily shows that the first lens groups 400 include first lenses 410 and 420), the first lens groups 400 being disposed corresponding to regions between adjacent light emitting units 200, the first lens groups 400 being configured to focus light reflected via a touch subject onto the corresponding fingerprint recognition unit 300.

Taking an OLED as an example, the array substrate 100 includes an active layer 110, a gate insulating layer 120, a gate layer 130, a capacitor insulating layer 140, a capacitor layer 150, an interlayer insulating layer 160, a source/drain pattern layer 170, a planarization layer 180, and the like, which are sequentially stacked. The array substrate 100 further includes a routing structure (not shown in fig. 2) such as data lines, scan lines, and power signal lines. The light emitting unit 200 includes an anode layer 210, a light emitting layer 220, a pixel defining layer 230, and the like.

The fingerprint identification unit 300 is used for on-screen fingerprint identification, and specifically, the display area 10 of the display panel includes a fingerprint identification area 101 therein, and the fingerprint identification unit is located in the fingerprint identification area 101. The fingerprint recognition unit 300 may be, for example, an image sensor that receives reflected light of a fingerprint including light reflected by ridges of the fingerprint and light reflected by valleys of the fingerprint. Wherein, the ridge contacts with display panel, and the valley is not contacted with display panel, causes the reflectivity that light shines on the valley of fingerprint and the ridge to be different, and then causes the intensity of two kinds of light that fingerprint identification unit 300 received to be different, and the photocurrent that converts is different, can carry out fingerprint identification according to the photocurrent size. When the intensity of the light reflected by the fingerprint is reduced, the resolution of the light reflected by the valleys and the light reflected by the ridges is also reduced, thereby reducing the sensitivity of fingerprint recognition.

The transmission direction of the fingerprint reflection light is a direction X vertical to the display panel. The direction of the display panel refers to a planar direction of the display panel, and then, the direction X perpendicular to the display panel refers to a thickness direction of the display panel. In the embodiment of the present invention, the plurality of first lenses in the first lens group 400 are stacked in a direction perpendicular to the display panel, so that the plurality of first lenses can sequentially and respectively converge the fingerprint reflected light. Taking fig. 2 as an example for illustration, the light 401, the light 402 and the light 403 are all fingerprint reflection light, if the first lens assembly 400 is not disposed, only the light 402 and the light 403 can irradiate the fingerprint identification unit 300, and the light 401 will be reflected and scattered on the capacitor layer 150 and will not irradiate the fingerprint identification unit 300. Compared with the prior art, the first lens group 400 is arranged to converge the fingerprint reflected light, so that the fingerprint reflected light can be prevented from irradiating opaque film structures (such as metal wiring and metal electrodes), and the fingerprint reflected light can pass through the opaque film structures, therefore, the loss and scattering of the fingerprint reflected light can be reduced, and the sensitivity of fingerprint identification is enhanced.

The number of the first lenses in the first lens group 400 is plural (i.e., at least two), which is advantageous in that the arrangement of the first lenses can be more flexible. This is because, taking the OLED array substrate 100 as an example, the layout of the pixel circuits and the signal lines connected to the pixel circuits in the array substrate 100 is relatively compact, and accordingly, the layout of the opaque film structures (such as the metal traces and the metal electrodes) is also relatively compact, so that the layout space of the first lens assembly 400 is limited. And the plurality of first lenses may be arranged to sequentially converge the fingerprint reflection light rays, and thus, when the plurality of first lenses are arranged, the size thereof may be sequentially reduced, and for example, the size of the first lens 410 may be arranged to be smaller than that of the first lens 420. Therefore, in the embodiment of the present invention, the arrangement manner of the plurality of first lenses is more flexible, the space of the display panel occupied by the first lens group is reduced, and the simplification of the wiring of the array substrate 100 is facilitated.

In summary, in the embodiment of the present invention, by adding the first lens assembly 400, on the basis of enhancing the sensitivity of fingerprint identification, the wiring modification of the original array substrate 100 is reduced.

With continued reference to FIG. 2, in one embodiment of the present invention, optionally, the first lens assembly 400 is multiplexed with a film layer of a display panel. Illustratively in fig. 2, the first lens 410 is multiplexed with the planarization layer 180 and the first lens 420 is multiplexed with the pixel defining layer 230. With such an arrangement, a new film layer does not need to be additionally arranged for the first lens assembly 400, which is beneficial to reducing the thickness of the display panel.

Further analysis, if the thickness of the display panel is to be reduced by arranging the first lens and the film layer of the display panel, and the first lens group 400 only comprises one first lens, in order to match with the film layer thickness of the display panel, the thickness of the first lens is thinner, the focal length of the lens is farther, and the convergence effect of the fingerprint reflected light is weakened.

Specifically, fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 3, the thickness d1 of the module cover plate ranges from 100um to 300um, preferably 200um, the thickness d2 of the touch layer ranges from 3um to 7um, preferably 5um, the total thickness d3 of the array substrate 100 and the light emitting unit 200 ranges from 20um to 30um, preferably 25um, the total thickness d4 of the support film 520 and the composite tape 510 ranges from 200um to 400um, preferably 300 um. If the first lens includes only one first lens 420, the touch main body contacts the module cover 900, and the fingerprint identification unit 300 is located on a side of the support film 520 away from the module cover 900. Compared to the thickness d1 of the module cover plate 900 and the total thickness d4 of the support film 520 and the composite tape 510, the thickness d2 of the touch layer 800 and the total thickness d3 of the array substrate 100 and the light emitting unit 200 are thinner, and therefore, the thickness d2 and the thickness d3 can be ignored in the process of calculating the focal length of the first lens assembly 400. Using the thickness d1 of the module cover plate as 200um, the thickness d2 of the touch layer as 5um, the total thickness d3 of the array substrate 100 and the light emitting unit 200 as 25um, and the total thickness d4 of the supporting film 520 and the composite tape 510 as 300um as an example, if the display panel only includes one first lens 420, then the distance between the touch main body and the first lens 420 is about 200um, the distance between the fingerprint identification unit 300 and the first lens 420 is about 300um, the focal length of the first lens 420 can be obtained by the calculation formula of the focal length of the lens as 120um, the radius of curvature of the first lens 420 is 240um, and the thickness of the first lens 420 is about 20 um. However, the first lens 420 is multiplexed with the pixel defining layer 230, and in order to match the thickness of the pixel defining layer 230, the thickness of the first lens 420 is much less than 20um, the light 401 still irradiates the capacitor layer 150 after passing through the first lens 420, and the image of the fingerprint image on the fingerprint identification unit 300 is blurred. Therefore, if the thickness of the display panel is to be reduced by disposing the first lens and the film layer of the display panel, and the first lens assembly 400 includes only one first lens 420, the converging effect of the light reflected by the fingerprint may be weakened.

The embodiment of the present invention creatively provides that the first lens assembly 400 includes a plurality of first lenses (two first lenses, i.e., a first lens 410 and a second lens 420, are shown in fig. 1), that is, each first lens is matched with the film thickness of the display panel, the set thickness is thinner, the plurality of lenses respectively converge the fingerprint reflected light in sequence, so as to enhance the converging effect of the fingerprint reflected light, and the definition of the fingerprint image imaged in the fingerprint identification unit 300 is improved by flexibly setting the focal length of each first lens. Therefore, the embodiment of the invention achieves unexpected technical effects.

Fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 4, in one embodiment of the present invention, optionally, a plurality of first lenses (including the first lens 410 and the second lens 420) constitute a part of an insulating layer (including the planarization layer 180 and the pixel defining layer 230) in the display panel. Illustratively, the first lens 410 constitutes the planarization layer 180 and the first lens 420 constitutes the pixel defining layer 230. The insulating layer in the display panel is generally a light-permeable film layer, and the material of the insulating layer may be, for example, Polyimide (PI), so that the insulating layer may be used to fabricate the first lens. Specifically, the manufacturing process of forming the first lens on the insulating layer may be, for example, a half-tone mask (Halftone) process, so that the position in the insulating layer corresponding to the first lens is formed into the shape of the lens. By the arrangement, the cost for additionally manufacturing the first lens is saved, the first lens and the display panel do not need to be aligned, and the process difficulty is favorably reduced.

With continued reference to fig. 4, on the basis of the above embodiments, the insulating layer optionally includes an intermediate insulating layer 160, a pixel defining layer 230, a planarization layer 180, or a support post layer 240 in the display panel. The reason for this is that, on one hand, the thicknesses of the intermediate insulating layer 160, the pixel defining layer 230, the planarization layer 180 and the support post layer 240 are relatively thick, and accordingly, the thickness of the first lens can be relatively thick, thereby being beneficial to enhancing the converging ability of the first lens on the fingerprint reflected light; on the other hand, unlike the gate insulating layer 120 and the capacitor insulating layer 140, the thin film transistor on the array substrate 100 is not affected by the first lens formed on the intermediate insulating layer 160, the pixel defining layer 230, the planarization layer 180, and the support pillar layer 240, and the characteristics of the thin film transistor may be affected by the unevenness of the first lens formed on the gate insulating layer 120 and the capacitor insulating layer 140. Therefore, the embodiment of the invention improves the converging effect of the first lens on the fingerprint reflected light on the premise of ensuring that the performance of the thin film transistor is not influenced.

It should be noted that fig. 4 exemplarily shows that the thickness of the first lens 410 is greater than that of the planarization layer 180, and the thickness of the first lens 420 is greater than that of the pixel defining layer 230, which is not a limitation of the present invention. In other embodiments, the thickness of the first lens may be smaller than or equal to the thickness of the film layer where the first lens is located, and may be set according to needs in practical applications.

It should be noted that fig. 2 to 4 exemplarily show that the number of the first lenses in the first lens group 400 is two, which is not a limitation of the present invention, and in other embodiments, the number of the first lenses in the first lens group 400 may be three or more. As shown in fig. 5, in one embodiment, the number of the first lenses in the first lens group 400 is optionally three, and the first lenses 410 disposed on the same layer as the planarization layer 180, the first lenses 420 disposed on the same layer as the pixel defining layer 230, and the first lenses 430 disposed on the same layer as the support post layer 240, respectively.

In the above embodiments, there are various ways of disposing the first lenses in the first lens group 400, the first lenses in the first lens group 400 may be disposed as a combination of concave lenses and convex lenses, and the first lenses in the first lens group 400 may also be disposed as convex lenses. Wherein, convex lens have the effect of assembling to fingerprint identification light, are convex lens with each first lens for first battery of lens 400 is better to fingerprint reflection light's the effect of assembling.

Furthermore, the first lens can be a single convex lens, can also be a shape with a plurality of convex lenses staggered with each other, and can also be a shape with a plurality of convex lenses nested with each other. The following is a specific description of the structure of the first lens provided in the embodiments of the present invention, but the present invention is not limited thereto.

Fig. 6 is a schematic structural diagram of a first lens according to an embodiment of the present invention, and fig. 7 is a schematic structural diagram taken along a section B-B in fig. 6. Referring to fig. 6 and 7, in one embodiment of the present invention, optionally, at least one of the first lenses is a fresnel lens. The fresnel lens is one of convex lenses, and has the characteristics of mutual nesting and annual ring distribution of a plurality of small convex lenses 411. Illustratively, the insulating layer in the array substrate 100 may be made into a rugged shape by using a Halftone process, and the rings are nested to form a fresnel lens. The continuous surface portion of the fresnel lens "collapses" to a flat surface. The fresnel lens surface is composed of a series of saw tooth type grooves 412 when viewed in cross section, with a central portion 413 that is an elliptical arc. Each groove 412 has a different angle from the adjacent groove 412, but concentrates the light at one point to form a central focal point, i.e., the focal point of the lens. Fresnel lens can also eliminate partial spherical aberration, consequently, adopts Fresnel lens to have the concentrated and even effect of spotlight effect, is favorable to reducing specular reflection to be favorable to further promoting fingerprint identification's sensitivity.

Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 8, on the basis of the above embodiments, optionally, the display panel further includes: the light absorbing structure 540 is located in a display region of a side of the array substrate 100 away from the light emitting unit 200, and the light absorbing structure 540 is used for absorbing the light rays 404 emitted by the light emitting unit 200 and irradiated onto the light absorbing structure 540 through the first lens. The light absorbing structure 540 may be made of, for example, black resin, and may absorb light irradiated thereon. The light ray 404 may be, for example, light leakage of the light emitting unit 200 inside the display panel, and the light leakage of the light ray 404 inside the display panel may affect characteristics of the thin film transistor, cause characteristic drift of the thin film transistor, and affect display of the display panel. In the embodiment of the invention, by arranging the first lens group 400, the light emitted by the light emitting unit 200 can be converged on the light absorbing structure 540, so that the light emitted by the light emitting unit 200 is prevented from irradiating the thin film transistor. The first lens group 400 provided in the embodiment of the present invention not only can converge the reflected light of the fingerprint to the fingerprint identification unit 300, but also can converge the light emitted by the light emitting unit 200 to the light absorbing structure 540, that is, the embodiment of the present invention reduces the characteristic drift of the thin film transistor on the basis of improving the sensitivity of the fingerprint identification. As shown in fig. 9, a curve 100A is a characteristic curve of a normal thin film transistor, a curve 100B is a characteristic curve of a thin film transistor in a display panel without the light absorbing structure 540, and a curve 100C is a characteristic curve of a thin film transistor in a display panel with the light absorbing structure 540. As can be seen from fig. 9, the embodiment of the present invention improves the characteristics of the thin film transistor.

With continued reference to fig. 8, in an embodiment of the present invention, optionally, the light absorbing structure 540 may be disposed between the substrate 530 and the supporting layer 520, for example, and the light absorbing structure 540 is formed with an opening 541, and the fingerprint identification unit 300 is disposed corresponding to the opening 541 of the light absorbing structure 540, so that the fingerprint reflected light can be irradiated onto the fingerprint identification unit 300.

Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 10, in one embodiment of the present invention, the light absorbing structure is optionally a composite tape 510, and the fingerprint recognition unit 300 is disposed corresponding to the opening 511 formed by the composite tape 510. The composite tape 510 is black, and can absorb the light 404 irradiated thereon. The embodiment of the invention arranges the composite adhesive tape 510 as the light absorption structure, and does not need to arrange the light absorption structure additionally, thereby being beneficial to the lightness and thinness of the display panel.

The first lens group 400 may be disposed corresponding to a region between adjacent light emitting units 200, as shown in fig. 1, the first lens group 400 may be disposed between four adjacent light emitting units 200, or the first lens group 400 may be disposed between two adjacent light emitting units 200, as shown in fig. 11. In practical application, the arrangement can be performed according to the specific arrangement mode of the pixels and the practical requirements.

Fig. 12 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 12, on the basis of the above embodiments, optionally, the array substrate 100 includes a substrate and a metal reflective structure disposed on a side of the substrate away from the fingerprint identification unit 300 and corresponding to the display area 10. In fig. 12, the substrate of the array substrate 100 exemplarily shown includes a first substrate 530 and a second substrate 560, and the metal reflective structure is a source drain layer 170. The display panel further includes: a plurality of groups of second lens groups 600, the second lens groups 600 including at least one second lens, and the second lens group 600 exemplarily shown in fig. 12 including a second lens 610 and a second lens 620. The second lens assembly 600 is disposed between the metal reflective structure (e.g., the source/drain layer 170) and the fingerprint identification unit 300, and the second lens assembly 600 is disposed corresponding to the area where the fingerprint identification unit 300 is located, and the second lens assembly 600 is configured to converge the external ambient light 405 onto the metal reflective structure.

The metal reflective structure may be, for example, a metal trace or a metal electrode. After the display panel is provided with the opening, the external ambient light 405 may be transmitted to the light emitting side of the display panel through the opening, which may affect the display of the display panel. In the embodiment of the present invention, the second lens assembly 600 is disposed, so that the external environment light 405 can be converged on the metal layer (e.g., the source/drain layer 170), the metal layer (e.g., the source/drain layer 170) reflects the external environment light 405, and the reflected external environment light 405 is still emitted from the opening due to the reversibility of the light path, so that the second lens assembly 600 functions to counteract the external environment light, thereby being beneficial to preventing the external environment light 405 from being emitted from the light emitting side of the display panel, and improving the display quality of the display panel.

With continued reference to fig. 12, in one embodiment of the present invention, the display panel optionally further includes a support film 520 between the array substrate 100 and the fingerprint recognition unit 300, and the at least one second lens is formed by the substrates (e.g., the first substrate 530 and the second substrate 560) or the support film 520. The substrates (e.g., the first substrate 530 and the second substrate 560) and the supporting film 520 are typically light-transmissive films, and the material thereof may be Polyimide (PI), for example, so that the second lens can be made of an insulating layer. Specifically, the manufacturing process of the substrate and the support film 520 to form the second lens may be, for example, a half-tone mask (Halftone) process, so that the position of the substrate or the support film 520 corresponding to the second lens is formed into the shape of the lens. The arrangement is favorable for lightening and thinning the display panel, the cost for additionally manufacturing the second lens is saved, the second lens and the display panel do not need to be aligned, and the process difficulty is favorably reduced.

With continued reference to fig. 12, in one embodiment of the present invention, optionally, the display panel further includes: the first barrier layer 550, the second barrier layer 570, and the buffer layer 580, the first substrate 530, the first barrier layer 550, the second substrate 560, the second barrier layer 570, and the buffer layer 580 are sequentially stacked. The first barrier layer 550 and the second barrier layer 570 are used to block external moisture from permeating into the light emitting unit 200, thereby prolonging the service life of the light emitting unit 580.

In an embodiment of the present invention, optionally, the vertical projection of the second lens group 600 on the substrate covers the corresponding vertical projection of the fingerprint identification unit 300 on the substrate, which is beneficial to increase the amount of the external environment light 405 irradiated onto the second lens group 600, thereby further enhancing the effect of offsetting the external environment light 405.

In the above embodiments, there are various ways of disposing the second lenses in the second lens group 600, the second lenses in the second lens group 600 may be disposed as a combination of concave lenses and convex lenses, and the second lenses in the second lens group 600 may also be disposed as convex lenses. Wherein, convex lens has the effect of assembling to external environment light 405, is convex lens with each second lens for second lens group 600 is better to external environment light 405's the effect of assembling.

Further, the second lens is a plurality of convex lenses, the second lens can be a single convex lens, or a plurality of convex lenses staggered with each other, or a plurality of convex lenses nested with each other, preferably, at least one second lens is a fresnel lens, and the fresnel lens has the effect of concentrating and homogenizing the light-gathering effect, thereby being beneficial to reducing the mirror reflection, and further improving the effect of the second lens group 600 on counteracting the external environment light 405.

Fig. 13 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and fig. 14 is a schematic structural diagram taken along a section C-C in fig. 13. Referring to fig. 13 and 14, on the basis of the above embodiments, optionally, the display panel further includes: the third lens group 700 includes at least one third lens, the third lens group 700 is located on a side of the light emitting unit 200 away from the array substrate 100, at least a portion of the light emitting unit 200 is correspondingly provided with the third lens, and the third lens group 700 is configured to converge the light 406 emitted by the corresponding light emitting unit 200 to the touch subject. The embodiment of the invention is arranged in such a way, so that the intensity of light rays irradiating the touch main body is enhanced, the intensity of the reflected light rays of the fingerprint is further enhanced, and the sensitivity of fingerprint identification is further improved.

With continued reference to fig. 13 and 14, in an embodiment of the present invention, optionally, a third lens assembly 700 is disposed on a side of each light emitting unit 200 away from the array substrate 100, which is beneficial to improve the display brightness of the whole display panel and to avoid the display unevenness caused by disposing the third lens assembly 700 only in the fingerprint identification area 101.

With continuing reference to fig. 13 and fig. 14, on the basis of the foregoing embodiments, optionally, the display panel further includes: the touch substrate 800 is located on a side of the light emitting unit 200 away from the array substrate 100, the touch substrate 800 includes at least one touch insulating layer, and the third lens is formed by the touch insulating layer. Fig. 14 exemplarily shows that the touch substrate 800 includes a touch metal layer 810, a touch insulating layer 820, a touch metal layer 830, and a touch insulating layer 840, which are sequentially stacked, and the third lens is formed by the touch insulating layer 840. The touch insulating layer is generally a transparent film layer, and the material of the touch insulating layer may be, for example, Polyimide (PI), so that the touch insulating layer may be used to fabricate the third lens. Specifically, the manufacturing process of forming the third lens on the touch insulating layer may be, for example, a half-tone mask (Halftone) process, so that a position in the touch insulating layer corresponding to the third lens is formed into a shape of the lens. The arrangement is favorable for lightening and thinning the display panel, the cost for additionally manufacturing the third lens is saved, the third lens and the display panel do not need to be aligned, and the process difficulty is favorably reduced.

In the above embodiments, the third lenses in the third lens group 700 may be arranged in various ways, the third lenses in the third lens group 700 may be a combination of concave lenses and convex lenses, and the third lenses in the third lens group 700 may be all convex lenses. The convex lenses have a converging effect on the light 406 emitted by the light emitting unit 200, and each third lens is a convex lens, so that the third lens group 700 has a better converging effect on the light 406 in the external environment.

Further, the third lens may be a single convex lens, or a shape in which a plurality of convex lenses are staggered with each other, or a shape in which a plurality of convex lenses are nested with each other, and preferably, at least one third lens is a fresnel lens which has a concentrated and uniform light-gathering effect, and is beneficial to reducing specular reflection, thereby being beneficial to further improving the effect of the third lens group 700 on the light 406 emitted by the light-emitting unit 200.

It should be noted that, in the above embodiments, it is exemplarily shown that each lens in the first lens group 400, the second lens group 600 and the third lens group 700 is multiplexed with each film layer in the display panel, and the invention is not limited thereto. In other embodiments, some lenses in the first lens group 400, the second lens group 600, and the third lens group 700 may be disposed in separately disposed layers, and may be set as needed in practical applications.

In the embodiment of the present invention, the plurality of first lenses in the first lens group 400 are stacked in a direction perpendicular to the display panel, so that the plurality of first lenses can sequentially and respectively converge the fingerprint reflected light. Compared with the prior art, the fingerprint identification method and the fingerprint identification device have the advantages that the fingerprint reflection light rays are prevented from irradiating opaque film layer structures (such as metal wiring and metal electrodes), so that the fingerprint reflection light rays can pass through the opaque film layer structures, the loss and scattering of the fingerprint reflection light rays can be reduced, and the fingerprint identification sensitivity is enhanced. In addition, the number of the first lenses in the first lens group 400 is multiple (i.e. at least two), which is advantageous in that the multiple first lenses can respectively and sequentially converge the fingerprint reflected light, and when the multiple first lenses are arranged, the sizes of the first lenses can be different. Therefore, in the embodiment of the present invention, the arrangement manner of the plurality of first lenses is more flexible, the space of the display panel occupied by the first lens group is reduced, and the simplification of the wiring of the array substrate 100 is facilitated. In summary, in the embodiment of the present invention, by adding the first lens assembly 400, on the basis of enhancing the sensitivity of fingerprint recognition, the wiring modification of the original array substrate 100 is reduced, so that the wiring design of the array substrate 100 is simplified.

The embodiment of the invention also provides a display device. Fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 15, the display device includes a display panel 1 according to any of the embodiments of the present invention. The display device can be various intelligent terminals such as a mobile phone, a tablet personal computer, intelligent wearable equipment and an information inquiry machine. The display device comprises the display panel provided by any embodiment of the invention, the technical principle and the generated technical effect are similar, and the description is omitted here.

The embodiment of the invention also provides a manufacturing method of the display panel. Fig. 16 is a schematic view of a film structure formed in each step of a method for manufacturing a display panel according to an embodiment of the present invention. Referring to fig. 16, the manufacturing method of the display panel includes the following steps:

s110, providing a substrate 530, and sequentially forming an active layer 110, a gate insulating layer 120, a gate layer 130, a capacitor insulating layer 140, a capacitor layer 150, an interlayer insulating layer 160, and a source/drain pattern layer 170 on the substrate 530.

The active layer 110, the gate insulating layer 120, the gate layer 130, the capacitor insulating layer 140, the capacitor layer 150, the interlayer insulating layer 160, and the source/drain pattern layer 170 may be fabricated by using a conventional process, and are not described herein again.

And S120, depositing a planarization layer 180 on the side of the source drain pattern layer 170 away from the substrate 530, and etching the planarization layer 180 to form a first lens 410 and a via hole 181 in a region between corresponding adjacent light emitting units.

The material of the planarization layer 180 may be Polyimide (PI), for example. The process of etching the planarization layer 180 to form the first lens 410 is preferably a half-tone mask (Halftone) process to form a curved effect of the first lens 410.

S130, manufacturing an anode layer 210 on one side, far away from the substrate 530, of the planarization layer 180, wherein the anode layer 210 is in contact with the corresponding source-drain pattern layer 170 through the through hole 181.

S140, depositing a pixel defining layer 230 on a side of the anode layer 210 away from the substrate 530, and etching the pixel defining layer 230 to form a first lens 420 and a via hole 231 in a region between corresponding adjacent light emitting cells.

The process of etching the pixel defining layer 230 to form the first lens 420 is preferably a half-tone mask (Halftone) process to form a curved surface effect of the second lens 420. The first lens 410 and the first lens 420 are stacked in a direction perpendicular to the display panel to form the first lens group 400. The first lens group is used for converging the light reflected by the touch main body to the corresponding fingerprint identification unit.

S150, the light emitting layer 220 is evaporated in the via hole 231 of the pixel defining layer 230.

In the embodiment of the present invention, the first lens 410 and the first lens 420 in the first lens group 400 are stacked in a direction perpendicular to the display panel, so that the first lens 410 and the first lens 420 can sequentially and respectively converge the fingerprint reflected light, loss and scattering of the fingerprint reflected light can be reduced, and sensitivity of fingerprint identification is enhanced. In addition, when the first lens 410 and the first lens 420 are arranged, the sizes of the first lens can be different, the arrangement mode is more flexible, the space of the display panel occupied by the first lens group is reduced, and the simplification of the wiring of the array substrate 100 is facilitated. And, the first lens 410 is formed by the planarization layer 180, and the first lens 420 is formed by the pixel defining layer 230, which saves the cost of additionally manufacturing the first lens, and does not need to align with the display panel when the first lens 410 and the first lens 420 are attached, thereby being beneficial to reducing the process difficulty. In summary, the embodiment of the present invention simplifies the wiring design of the array substrate 100 and reduces the process difficulty and the manufacturing cost on the basis of enhancing the sensitivity of fingerprint identification.

It should be noted that fig. 16 exemplarily shows that the first lens group 400 includes the first lens 410 and the first lens 420, the first lens 410 is formed by the planarization layer 180, and the first lens 420 is formed by the pixel defining layer 230, but the present invention is not limited thereto, and in other embodiments, the first lens group 400 may include three or more first lenses, and the insulating layer forming the first lens may also be an intermediate insulating layer, a support column layer, and the like, and may be set as needed in practical applications.

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 (10)

1. A display panel, comprising:

the array substrate and the light-emitting unit are positioned on the array substrate;

the fingerprint identification unit is positioned on one side of the array substrate, which is far away from the light-emitting unit;

the first lens group comprises a plurality of first lenses which are arranged in a stacking mode in the direction perpendicular to the display panel, the first lens group is arranged corresponding to the area between the adjacent light-emitting units, and the first lens group is used for converging light rays reflected by the touch main body to the corresponding fingerprint identification unit.

2. The display panel according to claim 1, wherein the plurality of first lenses constitute a part of an insulating layer in the display panel.

3. The display panel according to claim 2, wherein the insulating layer comprises an intermediate insulating layer, a pixel defining layer, or a planarizing layer in the display panel.

4. The display panel according to claim 1, wherein the first lens is a convex lens;

optionally, at least one of the first lenses is a fresnel lens.

5. The display panel according to claim 1, further comprising:

the light absorption structure is positioned in a display area on one side, far away from the light emitting unit, of the array substrate and is used for absorbing light rays emitted by the light emitting unit and irradiated onto the light absorption structure through the first lens;

optionally, the fingerprint identification unit is arranged corresponding to an opening formed by the light absorption structure;

optionally, the light absorbing structure is a composite tape.

6. The display panel according to claim 1, wherein the array substrate comprises a substrate and a metal reflection structure disposed in a corresponding display area on a side of the substrate away from the fingerprint identification unit;

the display panel further includes:

the second lens group is located between the metal reflection structure and the fingerprint identification unit and corresponds to the area where the fingerprint identification unit is located, and the second lens group is used for converging external environment light to the metal reflection structure.

7. The display panel according to claim 6, further comprising:

the third lens group is located on one side, away from the array substrate, of the light emitting unit, at least part of the light emitting units are correspondingly provided with the third lens, and the third lens group is used for converging light rays emitted by the corresponding light emitting units to the touch main body.

8. The display panel according to claim 7, further comprising:

the touch substrate is positioned on one side, away from the array substrate, of the light-emitting unit and comprises at least one touch insulating layer, and the third lens is formed by the touch insulating layer;

optionally, the third lens is a convex lens;

optionally, at least one of the third lenses is a fresnel lens.

9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.

10. The manufacturing method of the display panel is characterized in that the display panel comprises an insulating layer, a light-emitting unit and a fingerprint identification unit;

the manufacturing method of the display panel comprises the following steps:

depositing the insulating layer, etching the insulating layer, and forming a first lens in an area between the corresponding adjacent light emitting units; wherein the insulating layer comprises an intermediate insulating layer, a pixel defining layer, or a planarization layer in the display panel;

repeating the step of depositing the insulating layer to form a plurality of first lenses; the first lenses are arranged in a stacking mode along the direction perpendicular to the display panel to form a first lens group; the first lens group is used for converging light rays reflected by the touch main body to the corresponding fingerprint identification unit.

Images