Display panel, display device

Abstract

A display panel and a display device, the display panel comprising a fingerprint identification sensor, a first light shielding layer arranged above the fingerprint identification sensor, and a color filter layer arranged above the first light shielding layer, wherein: the color filter layer comprises color filters of different colors and light transmission portions arranged between the color filters of different colors; the first light shielding layer comprises first openings and light shielding portions, the light transmission portions and the first openings are used to allow fingerprint reflected light to pass through and reach the fingerprint identification sensor, and the light shielding portions are used to shield stray light. By shielding stray light through the light shielding portions, allowing fingerprint reflected light to pass through and reach the fingerprint identification sensor through the light transmission portions and the first openings, the light can pass through the screen for fingerprint identification without increasing power consumption. The preparation process is simple, the production efficiency is high, the production cost is low, the yield is high, and it has good application prospect.

Description

[0001] The application is a divisional application of patent application No. 202010476642.4, the original application date of which is May 29, 2020, the application number of which is 202010476642.4, and the title of the invention is “Display panel, preparation method thereof, and display device”. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of display, and in particular to a display panel and a display device. BACKGROUND

[0003] An organic light emitting diode (OLED) is an active light emitting display device, which has the advantages of self-emission, wide viewing angle, high contrast, low power consumption, and extremely high response speed. With the continuous development of display technology, OLED technology is increasingly applied to flexible display devices.

[0004] With the large-scale application of 5G, electronic devices have high demands for reducing the power consumption of screens. The CF on Encapsulation (COE) technology has emerged as the times require, and compared with a circular polarizer, the COE technology has higher transmittance and can reduce the power consumption of OLED products. The COE technology uses a black matrix (BM) and a color filter (CF) as a reflection reduction layer to reduce the reflection of ambient light by a reflective metal. However, current high-end mobile phones generally use fingerprint recognition technology, and in particular, under-screen and in-screen fingerprint recognition has become a trend. However, the COE technology blocks light from passing through the screen due to the black matrix, and thus cannot perform fingerprint recognition. SUMMARY

[0005] The embodiments of the present application provide a display panel and a display device, which can allow light to pass through the screen for fingerprint recognition without increasing power consumption.

[0006] The embodiments of the present application provide a display panel, which includes a fingerprint recognition sensor, a first light shielding layer disposed above the fingerprint recognition sensor, and a color film layer disposed above the first light shielding layer, wherein the color film layer includes color filters of different colors and light transmission portions disposed between the color filters of different colors; the first light shielding layer includes first openings and light shielding portions, the light transmission portions and the first openings are configured to allow fingerprint reflection light to pass through and reach the fingerprint recognition sensor, and the light shielding portions are configured to shield stray light.

[0007] In some possible implementation manners, the color film layer further includes a first black matrix arranged between color filters of different colors, a second opening is formed in the first black matrix, the second opening forms the light-transmitting part, and a projection of the second opening on the substrate contains an overlapping area with a projection of the fingerprint identification sensor on the substrate.

[0008] In some possible implementation manners, the display panel further includes a cover plate, a distance between the cover plate and the second opening in a direction perpendicular to the display panel is greater than a distance between the second opening and the fingerprint identification sensor in the direction perpendicular to the display panel, and an aperture of the second opening is less than or equal to an aperture of the first opening.

[0009] In some possible implementation manners, the color film layer further includes a polarizer arranged between color filters of different colors, the polarizer forms the light-transmitting part, and the first opening images a fingerprint pinhole in contact with the display panel onto the fingerprint identification sensor.

[0010] In some possible implementation manners, the display panel further includes a cover plate, a distance between the cover plate and the first opening in a direction perpendicular to the display panel is greater than a distance between the first opening and the fingerprint identification sensor in the direction perpendicular to the display panel.

[0011] In some possible implementation manners, the display panel further includes a touch structure layer and a second black matrix layer arranged on the color film layer in sequence, the touch structure layer includes a plurality of touch electrodes, the second black matrix layer includes a plurality of second black matrices provided with third openings, a projection of the second black matrix on the substrate covers a projection of the touch electrode on the substrate, and a projection of the third opening on the substrate contains an overlapping area with a projection of the first opening on the substrate.

[0012] In some possible implementations, the display panel includes a substrate and a plurality of pixel units arranged in a matrix on the substrate, each pixel unit including a plurality of sub-pixels, each sub-pixel including a driving structure layer, a first planar layer, a first electrode, a pixel definition layer, a spacer layer, an organic light-emitting layer, a second electrode, and an encapsulation layer, wherein: the driving structure layer is arranged on the substrate, and the driving structure layer in each sub-pixel includes a first thin film transistor; the first planar layer is arranged on the driving structure layer; the first electrode is arranged on the first planar layer and connected with the first thin film transistor in the driving structure layer through a via hole formed in the first planar layer; the pixel definition layer is arranged on the first planar layer and includes a plurality of pixel openings and a barrier wall around the pixel openings, and the pixel openings expose the first electrode; the spacer layer is arranged on the pixel definition layer; the organic light-emitting layer is arranged on the first electrode; the second electrode is arranged on the organic light-emitting layer; the encapsulation layer is arranged on the second electrode and covers the entire substrate; and the color filter layer is arranged on the encapsulation layer.

[0013] In some possible implementations, the display panel further includes a touch structure layer arranged between the encapsulation layer and the color filter layer, wherein: the touch structure layer includes a plurality of touch electrodes, and a projection of the touch electrodes on the substrate does not overlap a projection of the organic light-emitting layer on the substrate.

[0014] In some possible implementations, the barrier wall is made of an organic light-blocking material, the first opening is arranged on the barrier wall, and the barrier wall forms the light-blocking portion.

[0015] In some possible implementations, the first planar layer is made of an organic light-blocking material, the first opening is arranged on the first planar layer, and the first planar layer forms the light-blocking portion.

[0016] In some possible implementations, the driving structure layer includes, arranged in sequence on the substrate, a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, a first source-drain metal layer, a second interlayer insulating layer, and a second source-drain metal layer, the first opening is arranged on the second source-drain metal layer, and the second source-drain metal layer forms the first light-blocking layer.

[0017] In some possible implementations, the driving structure layer includes, arranged in sequence on the substrate, a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, and a first source-drain metal layer, and the first light-blocking layer is arranged between the substrate and the buffer layer.

[0018] In some possible implementation manners, the substrate includes a first substrate and a second substrate, and the first light-blocking layer is arranged between the first substrate and the second substrate.

[0019] In some possible implementation manners, the substrate is provided with a bottom film on a surface away from the driving structure layer, and the fingerprint identification sensor is attached to a surface of the bottom film away from the substrate.

[0020] In some possible implementation manners, the fingerprint identification sensor is arranged between the driving structure layer and the first flat layer, and the driving structure layer further includes a second thin film transistor for opening or closing the fingerprint identification sensor.

[0021] In some possible implementation manners, the display panel further includes a light filtering layer, and the light filtering layer is arranged above the fingerprint identification sensor and on a path through which the fingerprint reflected light passes through the first opening to the fingerprint identification sensor.

[0022] In some possible implementation manners, the light filtering layer is arranged on a light-transmitting part between the color filters of different colors, or the spacer layer contains a first color of filtering material and serves as the light filtering layer, and the first color of filtering material is used to filter out light that interferes with the fingerprint reflected light.

[0023] The display device provided by the embodiments of the present application also includes the display panel.

[0024] The display panel and the display device provided by the embodiments of the present application block stray light through the light-blocking part, allow the fingerprint reflected light to pass through and reach the fingerprint identification sensor through the light-transmitting part and the first opening, and enable light to pass through the screen for fingerprint identification without increasing power consumption. The preparation process is simple, the production efficiency is high, the production cost is low, the yield is high, and the display panel and the display device have good application prospects.

[0025] Of course, implementing any product or method of the present application does not necessarily require achieving all the advantages described above. Other features and advantages of the present application will be described in the following embodiments, and some will become apparent from the embodiments, or will be understood by those skilled in the art through implementation of the present application. The purposes and other advantages of the embodiments of the present application can be achieved and obtained through the structures specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the technical scheme of the present application, and form a part of the specification, and together with the embodiments of the present application, are used to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application. The shape and size of the components in the drawings do not reflect the true proportion, and the purpose is only to schematically illustrate the content of the present application.

[0027] Figure 1 Structure schematic diagram of a display panel of the first embodiment of the present application;

[0028] Figure 2 Structure schematic diagram of a display panel of the first embodiment of the present application;

[0029] Figure 3 Structure schematic diagram of a display panel of the first embodiment of the present application;

[0030] Figure 4 Structure schematic diagram of a display panel of the first embodiment of the present application;

[0031] Figure 5 Structure schematic diagram of a display panel of the first embodiment of the present application;

[0032] Figure 6 Schematic diagram of a flexible substrate after patterning of the embodiment of the present application;

[0033] Figure 7 Schematic diagram of a driving structure layer after patterning of the embodiment of the present application;

[0034] Figure 8 Schematic diagram of a first planarization layer after patterning of the embodiment of the present application;

[0035] Figure 9 Schematic diagram of a first electrode after patterning of the embodiment of the present application;

[0036] Figure 10 Schematic diagram of a pixel definition layer after patterning of the embodiment of the present application;

[0037] Figure 11 Schematic diagram of a spacer layer after patterning of the embodiment of the present application;

[0038] Figure 12 Schematic diagram of a second electrode after patterning of the embodiment of the present application;

[0039] Figure 13 Schematic diagram of an encapsulation layer after patterning of the embodiment of the present application;

[0040] Figure 14 Schematic diagram of a touch structure layer after patterning of the embodiment of the present application;

[0041] Figure 15 A schematic view of a color film layer pattern after forming according to an embodiment of the present application;

[0042] Figure 16 A schematic view of a cover plate after attaching according to an embodiment of the present application;

[0043] Figure 17 A structural schematic view of a display panel according to a second embodiment of the present application;

[0044] Figure 18 A structural schematic view of a display panel according to a third embodiment of the present application;

[0045] Figure 19 A structural schematic view of a display panel according to a third embodiment of the present application;

[0046] Figure 20 A structural schematic view of a display panel according to a third embodiment of the present application;

[0047] Figure 21 A structural schematic view of a display panel according to a third embodiment of the present application;

[0048] Figure 22 A structural schematic view of a display panel according to a third embodiment of the present application;

[0049] Figure 23 A structural schematic view of a display panel according to a fourth embodiment of the present application;

[0050] Figure 24 A structural schematic view of a display panel according to a fourth embodiment of the present application;

[0051] Figure 25 A structural schematic view of a display panel according to a fifth embodiment of the present application;

[0052] Figure 26 A structural schematic view of a display panel according to a fifth embodiment of the present application;

[0053] Figure 27 A flow schematic view of a display panel manufacturing method according to a sixth embodiment of the present application.

[0054] Explanation of reference signs:

[0055] 10 - substrate; 11 - first insulating layer; 12 - active layer;

[0056] 13 - second insulating layer; 14 - first gate electrode layer; 15 - third insulating layer;

[0057] 16 - second gate electrode layer; 17 - fourth insulating layer; 18 - source-drain metal layer;

[0058] 19 - first planarization layer; 20 - first electrode; 21 - pixel definition layer;

[0059] 22 - spacer layer; 23 - organic light-emitting layer; 24 - second electrode;

[0060] 25 - encapsulation layer; 26 - first touch electrode layer; 27 - fifth insulating layer;

[0061] 28 - second touch electrode layer; 29 - sixth insulating layer; 30 - first black matrix;

[0062] 31 - color filter; 32 - coating protective layer; 33 - optical glue;

[0063] 34 - cover plate; 1 - glass carrier plate; 2 - bottom film;

[0064] 35 - fingerprint identification sensor; 36 - foam layer; 37 - flexible circuit board;

[0065] 38 - second interlayer insulating layer; 39 - second source-drain metal layer; 40 - light shielding layer;

[0066] 41 - second black matrix; 42 - polarizer; 43 - PIN type photoelectric sensor;

[0067] 101 - first substrate; 102 - second substrate; MT - touch electrode;

[0068] S - source electrode; D - drain electrode; Finger - fingerprint;

[0069] GT - gate electrode; GT1 - first capacitor electrode; GT2 - second capacitor electrode;

[0070] 44 - light filtering layer. DETAILED DESCRIPTION

[0071] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application. It should be noted that the examples in the present application and the features in the examples can be combined with each other arbitrarily without conflict.

[0072] The display panel provided in the embodiments of the present application comprises a fingerprint identification sensor, a first light shielding layer arranged above the fingerprint identification sensor, and a color film layer arranged above the first light shielding layer, wherein the color film layer comprises color filters of different colors and a light transmission part arranged between the color filters of different colors; the first light shielding layer comprises a first opening and a light shielding part, the light transmission part and the first opening are used to allow fingerprint reflected light to pass through and reach the fingerprint identification sensor, and the light shielding part is used to shield stray light. The stray light in the embodiments of the present application includes stray light caused by reflection of light emitted by an organic light-emitting layer by a touch electrode in a touch structure layer.

[0073] The display panel provided in the embodiments of the present application shields stray light through the light shielding part, allows fingerprint reflected light to pass through and reach the fingerprint identification sensor through the light transmission part and the first opening, enables light to pass through the screen for fingerprint identification without increasing power consumption, has a simple preparation process, high production efficiency, low production cost, high yield and other advantages, and has a good application prospect.

[0074] The display panel of the embodiments of the present application can be implemented in various schemes. The technical solutions of the embodiments of the present application are described in detail below through specific embodiments.

[0075] First embodiment

[0076] Figures 1 to 5 Five structural diagrams of the display panel of the first embodiment of the present application. The main structure of the display panel of the present embodiment comprises a plurality of pixel units arranged in a matrix, each pixel unit comprises a plurality of sub-pixels, for example, each pixel unit can comprise three sub-pixels, which are red sub-pixel R, green sub-pixel G and blue sub-pixel B. The present embodiment sets a second opening on the first black matrix 30 between the color filters 31 of different colors, and images the fingerprint pinhole in contact with the display panel onto the fingerprint identification sensor 35 through the second opening.

[0077] As shown in Figures 1 to 5 The display panel of the present embodiment comprises a substrate 10 and a plurality of pixel units arranged in a matrix on the substrate 10, each pixel unit comprises a plurality of sub-pixels, each sub-pixel comprises a driving structure layer, a first planar layer 19, a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, a second electrode 24 and an encapsulation layer 25.

[0078] The driving structure layer is arranged on the substrate 10, and the driving structure layer in each sub-pixel includes a first thin film transistor; the first planar layer 19 is arranged on the driving structure layer; the first electrode 20 is arranged on the first planar layer 19 and connected with the first thin film transistor in the driving structure layer through a via hole formed on the first planar layer 19; the pixel definition layer 21 is arranged on the first planar layer 19 and includes a plurality of pixel openings and a barrier wall located around the pixel openings, and the pixel openings expose the first electrode 20; the spacer layer 22 is arranged on the pixel definition layer 21; the organic light-emitting layer 23 is arranged on the first electrode 20; the second electrode 24 is arranged on the organic light-emitting layer 23; the encapsulation layer 25 is arranged on the second electrode 24 and covers the entire substrate 10; and the color film layer is arranged above the encapsulation layer 25.

[0079] As shown in Figures 1 to 5 , the color film layer of the present embodiment includes color filters 31 of different colors and a first black matrix 30 arranged between the color filters 31 of different colors, the first black matrix 30 is provided with a second opening, and the orthographic projection of the second opening on the substrate 10 contains an overlapping area with the orthographic projection of the fingerprint recognition sensor 35 on the substrate 10. The second opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35, and the second opening forms the light-transmitting part.

[0080] As shown in Figures 1 to 5 , the display panel of the present embodiment further includes a cover plate 34. In an exemplary embodiment, the distance between the cover plate 34 and the second opening in a direction perpendicular to the display panel is greater than the distance between the second opening and the fingerprint recognition sensor 35 in a direction perpendicular to the display panel. Since the distance between the second opening and the outermost side of the screen is the object distance, and the distance between the second opening and the fingerprint recognition sensor 35 is the image distance, increasing the object distance relative to the image distance can increase the imaging area and reduce the density and number of the aperture array.

[0081] In an exemplary embodiment, to increase the distance between the cover plate 34 and the second opening in a direction perpendicular to the display panel, the cover plate 34 can be made into a multi-layer structure. For example, the cover plate 34 can be made into a double-layer structure.

[0082] In an exemplary embodiment, the shape of the first opening and / or the second opening can be square, circular, polygonal, etc.

[0083] In an exemplary embodiment, the aperture of the first opening and / or the second opening can be 3 to 30 microns.

[0084] In an exemplary embodiment, the aperture of the second opening is less than or equal to the aperture of the first opening, so as to avoid a decrease in the imaging area.

[0085] As shown in Figures 1 to 5As shown, the display panel of this embodiment further includes a touch structure layer, which is disposed between the encapsulation layer 25 and the color filter layer, wherein: the touch structure layer includes a plurality of touch electrodes ( Figures 1 to 5 In this application, MT stands for Metal and represents the touch electrode. The orthographic projection of the first black matrix 30 on the substrate 10 includes the orthographic projection of the touch electrode on the substrate 10.

[0086] In one exemplary embodiment, such as Figure 1 As shown, the barrier wall is made of organic light-blocking material, and a first opening is provided on the barrier wall, forming the light-blocking part. Figure 1 The first flat layer 19 is made of organic light-transmitting material.

[0087] In another exemplary embodiment, such as Figure 2 As shown, the material of the first planarization layer 19 is an organic light-shielding material, and the first planarization layer 19 is provided with a first opening, forming the light-shielding part. Figure 2 The retaining wall in the middle is made of organic light-transmitting material.

[0088] In yet another exemplary embodiment, such as Figure 3 As shown, the driving structure layer includes a buffer layer 11, an active layer 12, a first gate insulating layer 13, a first gate electrode layer 14, a second gate insulating layer 15, a second gate electrode layer 16, a first interlayer insulating layer 17, a first source / drain metal layer 18, a second interlayer insulating layer 38, and a second source / drain metal layer 39, which are stacked sequentially on the substrate 10. The second source / drain metal layer 39 has a first opening and forms the first light-shielding layer.

[0089] In yet another exemplary embodiment, such as Figure 4 As shown, the driving structure layer includes a buffer layer 11, an active layer 12, a first gate insulating layer 13, a first gate electrode layer 14, a second gate insulating layer 15, a second gate electrode layer 16, a first interlayer insulating layer 17, and a first source / drain metal layer 18, which are stacked sequentially on the substrate 10. A light-shielding layer 40 disposed between the substrate 10 and the buffer layer 11 forms the first light-shielding layer.

[0090] In yet another exemplary embodiment, such as Figure 5 As shown, the substrate 10 includes a first substrate 101 and a second substrate 102, and a light-shielding layer 40 disposed between the first substrate 101 and the second substrate 102 forms the first light-shielding layer.

[0091] In this embodiment, Figures 3 to 5 The first light-shielding layer in each layer is made of metal.

[0092] In one exemplary embodiment, such as Figures 1 to 5As shown, the surface of the substrate 10 on the side away from the driving structure layer is provided with a bottom film 2, and the fingerprint identification sensor 35 is attached to the surface of the bottom film 2 on the side away from the substrate 10.

[0093] In an exemplary embodiment, the fingerprint identification sensor 35 can be a Charge Coupled Device (CCD) image sensor, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, or a PIN (Positive Intrinsic Negative) type photoelectric sensor prepared by an amorphous silicon process.

[0094] The technical solution of the present embodiment is further illustrated below by the preparation process of the display panel. In the present embodiment, the "patterning process" refers to processes such as deposition of a film layer, coating of photoresist, mask exposure, development, etching, and stripping of photoresist. The "photolithography process" in the present embodiment refers to processes such as coating of a film layer, mask exposure, and development, which are mature preparation processes in related technologies. Deposition can use any one or more selected from sputtering, evaporation, and chemical vapor deposition, coating can use any one or more selected from spraying and spin coating, and etching can use any one or more selected from dry etching and wet etching. A "thin film" refers to a thin film of a certain material prepared on a substrate by deposition or coating process. If the "thin film" does not require a patterning process during the entire preparation process, the "thin film" can also be referred to as a "layer". If the "thin film" still requires a patterning process during the entire preparation process, it is referred to as a "thin film" before the patterning process and as a "layer" after the patterning process. The "layer" after the patterning process contains at least one "pattern". In the present disclosure, "A and B are disposed in the same layer" means that A and B are formed at the same time by the same patterning process. "The orthographic projection of A contains the orthographic projection of B" means that the orthographic projection of B falls within the orthographic projection of A, or the orthographic projection of A covers the orthographic projection of B.

[0095] (1) A flexible substrate 10 is prepared on a glass carrier plate 1. In the present disclosure, the material of the flexible substrate 10 can be polyimide (PI), polyethylene terephthalate (PET), or a surface-treated polymer soft film, etc. Figure 6 As shown.

[0096] (2) A driving structure layer pattern is prepared on the flexible substrate 10. The driving structure layer includes a plurality of gate lines and a plurality of data lines which are perpendicularly crossed to define a plurality of pixel units arranged in a matrix, each pixel unit including at least 3 sub-pixels, each sub-pixel including at least one first thin film transistor (TFT). The first thin film transistor can be a bottom-gate structure or a top-gate structure, and can be an amorphous silicon (a-Si) thin film transistor, a low-temperature polysilicon (LTPS) thin film transistor or an oxide thin film transistor, which is not specifically limited herein. In the embodiment, one pixel unit includes 3 sub-pixels, which are a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B. Of course, the embodiment is also applicable to the case where one pixel unit includes 4 sub-pixels (a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B and a white sub-pixel W). In an exemplary embodiment, the preparation process of the driving structure layer can include:

[0097] A first insulating film and an active layer film are sequentially deposited on the flexible substrate 10, and the active layer film is patterned by a patterning process to form a first insulating layer 11 covering the entire flexible substrate 10 and an active layer 12 pattern disposed on the first insulating layer 11. In an exemplary embodiment, the first insulating layer 11 is referred to as a buffer layer, which is used to improve the water-oxygen resistance of the substrate.

[0098] Subsequently, a second insulating film and a first metal film are sequentially deposited, and the first metal film is patterned by a patterning process to form a second insulating layer 13 covering the active layer 12 pattern and a first gate electrode layer 14 pattern disposed on the second insulating layer 13, the first gate electrode layer 14 including at least a first gate electrode GT and a first capacitor electrode GT1, a plurality of gate lines (not shown) and a plurality of gate leads (not shown). In an exemplary embodiment, the second insulating layer 13 is referred to as a first gate insulating (GI1) layer.

[0099] Subsequently, a third insulating film and a second metal film are sequentially deposited, and the second metal film is patterned by a patterning process to form a third insulating layer 15 covering the first gate electrode layer 14 and a second gate electrode layer 16 pattern disposed on the third insulating layer 15, the second gate electrode layer 16 including at least a second capacitor electrode GT2 and a second gate lead (not shown), the position of the second capacitor electrode GT2 corresponding to the position of the first capacitor electrode GT1. In an exemplary embodiment, the third insulating layer 15 is also referred to as a second gate insulating (GI2) layer.

[0100] Subsequently, a fourth insulating thin film is deposited, and the fourth insulating thin film is patterned by a patterning process to form a fourth insulating layer 17 pattern covering the second gate electrode layer 16, the fourth insulating layer 17 being provided with a plurality of first vias corresponding to positions of two ends of the first active layer respectively, the fourth insulating layer 17, the third insulating layer 15 and the second insulating layer 13 in the plurality of first vias being etched away to expose surfaces of the first active layer respectively. In an exemplary embodiment, the fourth insulating layer 17 is also referred to as a first interlayer dielectric (ILD) layer.

[0101] Subsequently, a third metal thin film is deposited, and the third metal thin film is patterned by a patterning process to form a source-drain metal layer 18 pattern on the fourth insulating layer 17, the source-drain metal layer 18 including at least a first source electrode S, a first drain electrode D, a low-voltage (VSS) line (not shown), a plurality of data lines (not shown) and a plurality of data lead lines (not shown) patterns, the first source electrode S and the first drain electrode D being connected to the active layer 12 through the first vias respectively. In an exemplary embodiment, the source-drain metal layer 18 can also include any one or more of a power supply line (VDD), a compensation line and an auxiliary second electrode according to actual needs, and the source-drain metal layer 18 is also referred to as a first source-drain metal layer (SD1).

[0102] At this point, the driving structure layer pattern is prepared on the flexible substrate 10, as shown in FIG. 1C. Figure 7 The active layer 12, the first gate electrode GT, the first source electrode S and the first drain electrode D constitute a first thin film transistor, the first capacitor electrode GT1 and the second capacitor electrode GT2 constitute a first storage capacitor, and the plurality of gate lead lines and the data lead lines constitute driving lead lines of a Gate Driver on Array (GOA).

[0103] (3) A first planar thin film is coated on the flexible substrate on which the aforementioned pattern is formed to form a first planar (PLN) layer 19 covering the entire flexible substrate 10, and a second via is formed on the first planar layer 19 by a patterning process, the first planar layer 19 in the second via being etched away to expose a surface of the first drain electrode of the first thin film transistor, as shown in FIG. 1D. Figure 8

[0104] ​(4) A transparent conductive film is deposited on the substrate on which the aforementioned pattern is formed. The transparent conductive film is patterned using a patterning process to form the pattern of the first electrode 20. The first electrode 20 is connected to the first drain electrode D through a second via. Forming the pattern of the first electrode 20 includes: depositing a fourth metal film on the substrate on which the aforementioned pattern is formed; coating a layer of photoresist on the fourth metal film; exposing the photoresist using a monochrome mask to form an unexposed area at the location of the first electrode 20 and fully exposed areas at other locations; developing to remove the photoresist from the fully exposed areas; subsequently etching away the fourth metal film in the fully exposed areas; and stripping the photoresist to form the pattern of the first electrode 20. Figure 9 As shown. Since the display panel in this embodiment has a top-emitting structure, the first electrode 20 is a reflective electrode, which can be a metal with high reflectivity, such as silver (Ag), gold (Au), palladium (Pd), platinum (Pt), or an alloy of these metals, or a composite layer of these metals. In actual implementation, a composite layer structure of indium tin oxide (ITO) layer and metal reflective layer can also be used, which has good conductivity, high reflectivity, and good morphological stability.

[0105] (5) A pixel definition film is coated on the substrate with the aforementioned pattern. A pixel definition layer (PDL) pattern is formed by masking, exposure, and development processes. Pixel openings are formed on the pixel definition layer 21. The pixel definition film within the pixel openings is developed away, exposing the surface of the first electrode 20. A first aperture is formed on the pixel definition layer 21. The pixel definition film within the first aperture is developed away, exposing the surface of the first planarization layer 19, such as... Figure 10 As shown.

[0106] (6) An organic material film is coated on the substrate on which the aforementioned pattern is formed. A spacer (PS) layer 22 pattern is formed through a masking, exposure, and development process. The spacer layer 22 is positioned at the location of the first opening, such as... Figure 11 As shown.

[0107] (7) An organic light-emitting layer 23 and a second electrode 24 are sequentially formed on the substrate on which the aforementioned pattern is formed, such as Figure 12 As shown. The organic light-emitting layer 23 includes a stacked hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer, formed within the pixel opening, enabling the organic light-emitting layer 23 to be connected to the first electrode 20. Since the first electrode 20 is connected to the first drain electrode D of the first transistor, the light emission control of the organic light-emitting layer 23 is achieved. The second electrode 24 is connected to the organic light-emitting layer 23.

[0108] (8) Form an encapsulation layer 25 pattern on the substrate on which the aforementioned pattern is formed, such as Figure 13 As shown, the encapsulation layer 25 can adopt a stacked structure of inorganic material / organic material / inorganic material, with the organic material layer disposed between the two inorganic material layers.

[0109] (9) Forming a touch structure layer pattern on the substrate with the above-mentioned patterns, the touch structure layer including a first touch electrode layer 26, a fifth insulating layer 27, a second touch electrode layer 28 and a sixth insulating layer 29 stacked on the encapsulation layer 25, as shown in Figure 14 .

[0110] (10) Forming a color film layer pattern on the substrate with the above-mentioned patterns, the color film layer being disposed on the sixth insulating layer 29 and including a first black matrix 30 and color filters 31 disposed in the same layer, as shown in Figure 15 . Forming the color filter layer pattern includes: first, coating a high-molecular photoresist layer mixed with a black matrix material on the sixth insulating layer 29, and then performing exposure and development to form the first black matrix 30 pattern; then, coating a high-molecular photoresist layer mixed with red pigment on the sixth insulating layer 29, and then performing exposure and development to form the pattern of the red region; and using the same method and steps to sequentially form the pattern of the green region and the pattern of the blue region. Finally, the color filters 31 of red, green and blue primary colors arranged according to a certain rule are formed. The first black matrix 30 between the color filters 31 of different colors is provided with a second opening, and the surface of the sixth insulating layer 29 is exposed through the second opening.

[0111] (11) Performing a thin film encapsulation process on the substrate with the above-mentioned patterns to form a coating protection layer 32 pattern; coating an optical adhesive 33 on the substrate with the coating protection layer 32 pattern, and then attaching a cover plate 34 on the optical adhesive 33, as shown in Figure 16 .

[0112] (12) After the above-mentioned film layer structure is prepared, the display substrate is first peeled off from the glass carrier plate 1 by a peeling process, and then a bottom film 2 is attached to the back surface of the display substrate (the surface of the flexible substrate 10 away from the film layer) by a roller attachment method. A fingerprint recognition sensor 35 is attached to the surface of the bottom film 2 away from the flexible substrate 10, and the fingerprint recognition sensor 35 is attached to the surface of the bottom film 2 away from the flexible substrate 10 through a foam layer 36. The fingerprint recognition sensor 35 is connected to a flexible printed circuit (FPC) 37, as shown in Figure 1 .

[0113] Through the above process, the present embodiment is completed Figure 1Preparation of the display panel shown. As can be seen from the above preparation process, the display panel provided in the embodiment blocks stray light through the light shielding part, allows the fingerprint reflection light to pass through the light transmission part and the first opening and reach the fingerprint recognition sensor 35, enables the light to pass through the screen for fingerprint recognition without increasing power consumption, has a simple preparation process, high production efficiency, low production cost and high yield, and has a good application prospect.

[0114] Although the display panel of the embodiment is described in the top emission structure, the embodiment is also applicable to the bottom emission structure or the double-sided emission structure, and is also applicable to large-size or small-size display panels. As shown in Figure 1 The display panel formed by the above preparation process includes:

[0115] a substrate 10;

[0116] a driving structure layer disposed on the substrate 10, the driving structure layer in each sub-pixel including a first thin film transistor;

[0117] a first planar layer 19 disposed on the driving structure layer;

[0118] a light-emitting structure layer disposed on the first planar layer 19, the light-emitting structure layer in each sub-pixel including a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, and a second electrode 24, the first electrode 20 being disposed on the first planar layer 19 and connected to the first thin film transistor in the driving structure layer through a via hole formed in the first planar layer 19, the pixel definition layer 21 being disposed on the first planar layer 19 and including a plurality of pixel openings and a barrier wall located around the pixel openings, the pixel openings exposing the first electrode 20, the barrier wall being made of an organic light-shielding material, and the barrier wall being provided with a first opening; the spacer layer 22 being disposed on the pixel definition layer 21; the organic light-emitting layer 23 being disposed on the first electrode 20; and the second electrode 24 being disposed on the organic light-emitting layer 23;

[0119] an encapsulation layer 25 disposed on the second electrode 24 and covering the entire substrate 10;

[0120] a touch structure layer including a first touch electrode layer 26, a fifth insulating layer 27, a second touch electrode layer 28, and a sixth insulating layer 29 stacked on the encapsulation layer 25;

[0121] a color filter layer disposed on the sixth insulating layer 29 and including a black matrix 30 and color filters 31 disposed in the same layer, the black matrix 30 between the color filters 31 of different colors being provided with a second opening, the second opening exposing the surface of the sixth insulating layer 29;

[0122] a protective layer 32 disposed on the color filter layer for protecting the color filter layer;

[0123] The cover plate 34 is attached to the protective coating 32 by optical adhesive 33;

[0124] The bottom membrane 2 is disposed on the surface of the substrate 10 on the side away from the driving structure layer;

[0125] A fingerprint sensor 35 is attached to the surface of the base film 2 on the side away from the substrate 10.

[0126] Figures 2 to 5 The manufacturing process of the display panel shown is similar, and will not be described in detail here.

[0127] Second Embodiment

[0128] This embodiment is an extension of the aforementioned first embodiment. The main structure is essentially the same as the first embodiment, except that, in the first embodiment... Figures 1 to 5 The touch structure layer is disposed between the encapsulation layer 25 and the color filter layer. In this embodiment, the touch structure layer is disposed above the color filter layer. Figure 17 As shown, the display panel provided in this embodiment includes multiple pixel units arranged in a matrix. Each pixel unit includes multiple sub-pixels. For example, each pixel unit may include three sub-pixels, namely a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. The display panel of this embodiment has a second black matrix layer on the touch structure layer. The second black matrix layer includes multiple second black matrices 41 with third openings. The orthographic projection of the second black matrix 41 on the substrate 10 covers the orthographic projection of the touch electrode on the substrate 10, thereby eliminating stray light caused by reflection from the touch electrode through the second black matrix 41.

[0129] like Figure 17 As shown, the display panel of this embodiment includes a substrate 10 and a plurality of pixel units arranged in a matrix on the substrate 10. Each pixel unit includes a plurality of sub-pixels. Each sub-pixel includes a driving structure layer, a first planarization layer 19, a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, a second electrode 24, an encapsulation layer 25, a color filter layer, and a coating protective layer 32.

[0130] The driving structure layer is arranged on the substrate 10, and each driving structure layer in the sub-pixel includes a first thin film transistor; the first planar layer 19 is arranged on the driving structure layer; the first electrode 20 is arranged on the first planar layer 19 and connected with the first thin film transistor in the driving structure layer through a via hole formed on the first planar layer 19; the pixel definition layer 21 is arranged on the first planar layer 19 and includes a plurality of pixel openings and a barrier wall located around the pixel openings, and the pixel openings expose the first electrode 20; the spacer layer 22 is arranged on the pixel definition layer 21; the organic light-emitting layer 23 is arranged on the first electrode 20; the second electrode 24 is arranged on the organic light-emitting layer 23; the encapsulation layer 25 is arranged on the second electrode 24 and covers the entire substrate 10; the color filter layer is arranged on the encapsulation layer 25; and the coating protection layer 32 is arranged on the color filter layer.

[0131] As shown in Figure 17 The display panel of the embodiment further includes a touch structure layer and a second black matrix layer arranged on the coating protection layer 32 in sequence.

[0132] The touch structure layer includes a plurality of touch electrodes.

[0133] The second black matrix layer includes a plurality of second black matrices 41 provided with third openings, the orthographic projection of the second black matrix 41 on the substrate 10 covers the orthographic projection of the touch electrode on the substrate 10, and the orthographic projection of the third opening on the substrate 10 and the orthographic projection of the second opening on the substrate 10 contain an overlapping area.

[0134] Similar to the principle of the first embodiment, the first light shielding layer of the embodiment can be an organic material layer that is opaque to light, which can be arranged on the first planar layer 19 or the pixel definition layer 21; or the first light shielding layer of the embodiment can also be made of a metal layer, which can be arranged at any one of the following positions: arranged on the second source-drain metal layer 39; arranged between the substrate 10 and the buffer layer 11; arranged between the first substrate 101 and the second substrate 102.

[0135] The embodiment also achieves the technical effects of the first embodiment, including shielding stray light through the light shielding part, allowing the reflected light of the fingerprint to pass through the light transmission part and the first opening and reach the fingerprint recognition sensor 35, allowing light to pass through the screen for fingerprint recognition without increasing power consumption, and having simple preparation process, high production efficiency, low production cost, high yield and good application prospect; and the second opening is arranged on the first black matrix 30 between the color filters 31 of different colors, and the fingerprint pinhole in contact with the display panel is imaged onto the fingerprint recognition sensor 35 through the second opening.

[0136] Third embodiment

[0137] The first embodiment or the second embodiment is extended, and the main structure is basically the same as the first embodiment or the second embodiment. The difference is that the color film layer in the first embodiment or the second embodiment includes a first black matrix 30, and the second opening is arranged on the first black matrix 30, and the second opening forms the light transmission part. The color film layer of the embodiment includes a polarizer, and the polarizer forms the light transmission part. As shown in Figures 18 to 22 The display panel provided by the embodiment includes a plurality of pixel units arranged in a matrix, each pixel unit includes a plurality of sub-pixels, for example, each pixel unit can include three sub-pixels, which are red sub-pixels R, green sub-pixels G and blue sub-pixels B. The color film layer of the display panel includes color filters 31 of different colors and polarizers 42 arranged between the color filters 31 of different colors. The polarizers 42 form the light transmission part, and the first opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35.

[0138] As shown in Figures 18 to 22 The display panel includes a substrate 10, a driving structure layer, a first planar layer 19, a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, a second electrode 24, an encapsulation layer 25, a touch structure layer, a color film layer, a protective coating layer 32 and a cover plate 34 arranged on the substrate 10.

[0139] The driving structure layer is arranged on the substrate 10, and the driving structure layer in each sub-pixel includes a first thin film transistor. The first planar layer 19 is arranged on the driving structure layer. The first electrode 20 is arranged on the first planar layer 19 and connected with the first thin film transistor in the driving structure layer through a via hole arranged on the first planar layer 19. The pixel definition layer 21 is arranged on the first planar layer 19 and includes a plurality of pixel openings and a barrier wall around the pixel openings. The pixel openings expose the first electrode 20. The spacer layer 22 is arranged on the pixel definition layer 21. The organic light-emitting layer 23 is arranged on the first electrode 20. The second electrode 24 is arranged on the organic light-emitting layer 23. The encapsulation layer 25 is arranged on the second electrode 24 and covers the entire substrate 10. The touch structure layer is arranged on the encapsulation layer 25. The color film layer is arranged on the touch structure layer. The protective coating layer 32 is arranged on the color film layer. The cover plate 34 is arranged on the protective coating layer 32.

[0140] In the embodiment, the color film layer includes color filters 31 of different colors and polarizers 42 arranged between the color filters 31 of different colors. The polarizers 42 form the light transmission part, and the first opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35.

[0141] In an exemplary embodiment, as Figures 7 to 11As shown, the display panel further comprises a cover plate 34, and the distance between the cover plate 34 and the first aperture in the direction perpendicular to the display panel is greater than the distance between the first aperture and the fingerprint recognition sensor 35 in the direction perpendicular to the display panel. Since the distance between the first aperture and the outermost side of the screen is the object distance, and the distance between the first aperture and the fingerprint recognition sensor 35 is the image distance, the object distance being greater than the image distance can increase the imaging area and reduce the density and number of the pinhole array.

[0142] In an exemplary embodiment, to increase the distance between the cover plate 34 and the first aperture in the direction perpendicular to the display panel, the cover plate 34 can be made into a multi-layer structure. For example, the cover plate 34 can be made into a double-layer structure.

[0143] In an exemplary embodiment, the shape of the first aperture can be square, circular, polygonal, etc.

[0144] In an exemplary embodiment, the aperture of the first aperture can be 3-30 microns.

[0145] The first light shielding layer of the present embodiment can be a light-proof organic material layer, which can be arranged on the first flat layer 19 or the pixel definition layer 21; or the first light shielding layer of the present embodiment can also be made of a metal layer, which can be arranged at any one of the following positions: on the second source-drain metal layer 39; between the substrate 10 and the buffer layer 11; between the first substrate 101 and the second substrate 102.

[0146] In an exemplary embodiment, as shown in Figure 18 The material of the barrier wall is an organic light shielding material, the barrier wall is provided with the first aperture, and the barrier wall forms the light shielding part.

[0147] In another exemplary embodiment, as shown in Figure 19 The material of the first flat layer 19 is an organic light shielding material, the first flat layer 19 is provided with the first aperture, and the first flat layer 19 forms the light shielding part.

[0148] In yet another exemplary embodiment, as shown in Figure 20 The driving structure layer comprises, arranged in sequence on the substrate 10, the buffer layer 11, the active layer 12, the first gate insulating layer 13, the first gate electrode layer 14, the second gate insulating layer 15, the second gate electrode layer 16, the first interlayer insulating layer 17, the first source-drain metal layer 18, the second interlayer insulating layer 38, and the second source-drain metal layer 39, the second source-drain metal layer 39 is provided with the first aperture, and the second source-drain metal layer 39 forms the first light shielding layer.

[0149] In yet another exemplary embodiment, as shown in Figure 21As shown, the driving structure layer includes, in sequence from bottom to top, a buffer layer 11, an active layer 12, a first gate insulating layer 13, a first gate electrode layer, a second gate insulating layer 15, a second gate electrode layer 16, a first interlayer insulating layer 17, and a first source-drain metal layer 18, and the light shielding layer 40 disposed between the substrate 10 and the buffer layer 11 forms the first light shielding layer.

[0150] In yet another example embodiment, as shown in FIG. 4, the substrate 10 includes a first substrate 101 and a second substrate 102, and the light shielding layer 40 disposed between the first substrate 101 and the second substrate 102 forms the first light shielding layer. Figure 22

[0151] The present embodiment also achieves the technical effects of the first embodiment or the second embodiment, including shielding stray light through the light shielding part, allowing fingerprint reflected light to pass through the light transmission part and the first opening and reach the fingerprint recognition sensor 35, enabling light to pass through the screen for fingerprint recognition without increasing power consumption, and having a simple preparation process, high production efficiency, low production cost, high yield, and good application prospects. Meanwhile, the present embodiment sets the polarizer 42 between color filters 31 of different colors, forms the light transmission part by the polarizer 42, and images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35 through the first opening.

[0152] Fourth embodiment

[0153] The present embodiment is an extension of the first embodiment, the second embodiment, or the third embodiment, and the main structure is basically the same as the first embodiment, the second embodiment, or the third embodiment, except that the fingerprint recognition sensor 35 in the first embodiment, the second embodiment, or the third embodiment is disposed at the bottom of the display panel, and the fingerprint recognition sensor 35 of the present embodiment is disposed inside the display panel. The fingerprint recognition sensor 35 of the present embodiment can be a PIN-type photoelectric sensor 43 prepared by amorphous silicon technology.

[0154] As shown in FIG. 5, the display panel provided by the present embodiment includes a plurality of pixel units arranged in a matrix, and each pixel unit includes a plurality of sub-pixels, for example, each pixel unit can include 3 sub-pixels, which are a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Figure 23 Figure 24 As shown in FIG. 5, the display panel provided by the present embodiment includes a plurality of pixel units arranged in a matrix, and each pixel unit includes a plurality of sub-pixels, for example, each pixel unit can include 3 sub-pixels, which are a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.

[0155] As shown in FIG. 5, the display panel provided by the present embodiment includes a plurality of pixel units arranged in a matrix, and each pixel unit includes a plurality of sub-pixels, for example, each pixel unit can include 3 sub-pixels, which are a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Figure 23 Figure 24 ​​​As shown, the display panel comprises a substrate 10, and a driving structure layer, a photoelectric sensor layer, a first planarization layer 19, a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, a second electrode 24, an encapsulation layer 25, a touch structure layer, a color filter layer, a coating protection layer 32, and a cover plate 34 arranged on the substrate 10.

[0156] The driving structure layer is arranged on the substrate 10, and the driving structure layer in each sub-pixel comprises a first thin film transistor and a second thin film transistor; the photoelectric sensor layer is arranged on the driving structure layer and comprises a PIN-type photoelectric sensor 43, the PIN-type photoelectric sensor 43 is connected with the second thin film transistor in the driving structure layer, and the second thin film transistor is used for opening or closing the PIN-type photoelectric sensor 43; the first planarization layer 19 is arranged on the photoelectric sensor layer; the first electrode 20 is arranged on the first planarization layer 19 and connected with the first thin film transistor in the driving structure layer through a via hole formed on the first planarization layer 19; the pixel definition layer 21 is arranged on the first planarization layer 19 and comprises a plurality of pixel openings and a barrier wall located around the pixel openings, the pixel openings expose the first electrode 20; the spacer layer 22 is arranged on the pixel definition layer 21; the organic light-emitting layer 23 is arranged on the first electrode 20; the second electrode 24 is arranged on the organic light-emitting layer 23; the encapsulation layer 25 is arranged on the second electrode 24 and covers the entire substrate 10; the touch structure layer is arranged on the encapsulation layer 25; the color filter layer is arranged on the touch structure layer; the coating protection layer 32 is arranged on the color filter layer; and the cover plate 34 is arranged on the coating protection layer 32.

[0157] As shown in Figure 23 The color filter layer comprises color filters 31 of different colors and a first black matrix 30 arranged between the color filters 31 of different colors, the first black matrix 30 is provided with a second opening, the orthographic projection of the second opening on the substrate 10 contains an overlapping area with the orthographic projection of the fingerprint recognition sensor 35 on the substrate 10, the second opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35, and the second opening forms the light-transmitting part.

[0158] As shown in Figure 24 The color filter layer comprises color filters 31 of different colors and a polarizer 42 arranged between the color filters 31 of different colors, the polarizer 42 forms the light-transmitting part, and the first opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35.

[0159] The first light-blocking layer of the embodiment can be an organic material layer that is not transparent to light, which can be arranged on the first planarization layer 19 or on the pixel definition layer 21.

[0160] In an exemplary embodiment, as Figure 23As shown, the material of the barrier wall is an organic light-shielding material, and the barrier wall is provided with the first opening, and the barrier wall forms the light-shielding part.

[0161] In another exemplary embodiment, the material of the first flat layer 19 is an organic light-shielding material, and the first flat layer 19 is provided with the first opening, and the first flat layer 19 forms the light-shielding part.

[0162] In an exemplary embodiment, the distance between the cover plate 34 and the first opening in the direction perpendicular to the display panel is greater than the distance between the first opening and the fingerprint recognition sensor 35 in the direction perpendicular to the display panel.

[0163] The present embodiment also achieves the technical effects of the first embodiment, the second embodiment, or the third embodiment, including shielding stray light through the light-shielding part, allowing fingerprint reflection light to pass through the light-transmitting part and the first opening and reach the fingerprint recognition sensor 35, allowing light to pass through the screen for fingerprint recognition without increasing power consumption, simple preparation process, high production efficiency, low production cost, high yield, and good application prospect. The present embodiment sets the PIN-type photoelectric sensor 43 on the driving structure layer, and opens or closes the PIN-type photoelectric sensor 43 through the second thin film transistor provided in the driving structure layer.

[0164] Fifth embodiment

[0165] The present embodiment is an extension of the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, and the main structure is basically the same as the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment. The difference is that the display panel of the present embodiment is provided with a filter layer 44 above the fingerprint recognition sensor 35, and the filter layer 44 is arranged on the path through which the fingerprint reflection light passes after passing through the first opening to reach the fingerprint recognition sensor.

[0166] As Figure 25 and Figure 26As shown, the display panel provided by the embodiment includes a substrate 10, a driving structure layer, a first planarization layer 19, a first electrode 20, a pixel definition layer 21, a spacer layer 22, an organic light-emitting layer 23, a second electrode 24, an encapsulation layer 25, a touch structure layer, a color filter layer, a coating protection layer 32, and a cover plate 34, which are arranged on the substrate 10. The driving structure layer is arranged on the substrate 10, and each driving structure layer in each sub-pixel includes a first thin film transistor. The first planarization layer 19 is arranged on the driving structure layer. The first electrode 20 is arranged on the first planarization layer 19 and connected to the first thin film transistor in the driving structure layer through a via hole formed in the first planarization layer 19. The pixel definition layer 21 is arranged on the first planarization layer 19 and includes a plurality of pixel openings and a barrier wall around the pixel openings, and the pixel openings expose the first electrode 20. The spacer layer 22 is arranged on the pixel definition layer 21. The organic light-emitting layer 23 is arranged on the first electrode 20. The second electrode 24 is arranged on the organic light-emitting layer 23. The encapsulation layer 25 is arranged on the second electrode 24 and covers the entire substrate 10. The touch structure layer is arranged on the encapsulation layer 25. The color filter layer is arranged on the touch structure layer. The coating protection layer 32 is arranged on the color filter layer. The cover plate 34 is arranged on the coating protection layer 32.

[0167] In an example embodiment, as shown in Figure 25 and Figure 26 The color filter layer includes color filters 31 of different colors and first black matrices 30 arranged between the color filters 31 of different colors. The first black matrices 30 are provided with second openings, and the orthographic projection of the second openings on the substrate 10 contains an overlapping area with the orthographic projection of the fingerprint recognition sensor 35 on the substrate 10. The second openings image the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor 35, and the second openings form the light-transmitting portions.

[0168] In an example embodiment, the light filter layer 44 is arranged on the light-transmitting portions between the color filters 31 of different colors.

[0169] In an example embodiment, as shown in Figure 25 The light filter layer 44 is arranged in the same layer as the color filter layer, and the light filter layer 44 includes a plurality of first color filters, each of which covers a second opening. The first color filter is used to filter out light that interferes with the reflection of fingerprint light. For example, the first color filter can filter out light that can pass through the finger (generally infrared light) in external light.

[0170] In an example embodiment, the first color filter is a green filter (a filter that can transmit green light) or a cyan filter (a filter that can transmit cyan light).

[0171] Screen under fingerprint recognition uses the light emitted by OLED to be reflected by human fingers into the fingerprint recognition sensor under the screen. The ridges and valleys on the fingers reflect light differently and form bright and dark stripes. Because human fingers have a certain transmittance to infrared light, generally no red light is emitted when performing fingerprint recognition, and green light (higher luminous efficiency) or green and blue light is used. However, human fingers have a certain transmittance to infrared light, so the infrared light in external light will also penetrate the fingers into the fingerprint recognition sensor, which will interfere with the true fingerprint signal. The display panel in the embodiment of the present application prepares a green or cyan filter layer above the fingerprint recognition sensor 35, which is used to filter out the infrared light of external light penetrating the fingers.

[0172] In another example embodiment, as shown in FIG. 6, the spacer layer 22 contains a first color of filter material, which is used as a filter layer 44. The first color of filter material is used to filter out light that interferes with the reflection of fingerprint light. For example, the first color of filter material is green filter material (i.e., filter material that can transmit green light) or cyan filter material (i.e., filter material that can transmit cyan light). Figure 26

[0173] It should be noted that the filter layer in the present embodiment can be placed at any position in the light path of the fingerprint reflection light passing through the first opening into the fingerprint recognition sensor, and the present application does not limit this.

[0174] The present embodiment also achieves the technical effects of the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, including blocking stray light through the light blocking portion, allowing fingerprint reflection light to pass through the light transmission portion and the first opening and reach the fingerprint recognition sensor 35, allowing light to pass through the screen for fingerprint recognition without increasing power consumption, and having a simple preparation process, high production efficiency, low production cost, high yield, and good application prospects. In addition, the present embodiment sets the filter layer 44 on the path of the fingerprint reflection light passing through the first opening to the fingerprint recognition sensor, filters out infrared light in external light, and enhances the effect of fingerprint recognition.

[0175] Sixth Embodiment

[0176] The present application also provides a method for preparing a display panel. As shown in FIG. 8, the method for preparing the display panel of the present application includes: Figure 27

[0177] S1, forming a first light blocking layer above the substrate, the first light blocking layer including a first opening and a light blocking portion.

[0178] ​​S2, forming a color filter layer above the first light shielding layer, the color filter layer comprising color filters of different colors and light transmission portions arranged between the color filters of different colors, the light transmission portions and the first openings being configured to allow the reflected light of the fingerprint to pass through and reach the fingerprint recognition sensor, and the light shielding portions being configured to shield stray light.

[0179] S3, attaching the fingerprint recognition sensor below the substrate.

[0180] In an example embodiment, the forming of the first light shielding layer above the substrate in S1 can include any one of the following:

[0181] (1) the substrate comprises a first substrate and a second substrate, the first light shielding layer is formed on the first substrate, and the second substrate is formed on a surface of the first light shielding layer away from the first substrate;

[0182] (2) the first light shielding layer is formed on the substrate, and a pixel structure layer is formed on the first light shielding layer;

[0183] (3) the pixel structure layer is formed on the substrate, the pixel structure layer comprises a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, a first source-drain metal layer, a second interlayer insulating layer, and a second source-drain metal layer arranged in sequence on the substrate, and the second source-drain metal layer forms the first light shielding layer;

[0184] (4) the pixel structure layer is formed on the substrate, a first planarization layer is formed on a surface of the pixel structure layer away from the substrate, a first electrode and a pixel definition layer are formed on a surface of the first planarization layer away from the pixel structure layer, the pixel definition layer comprises a plurality of openings and a barrier wall around the openings, the openings expose the first electrode, the barrier wall is provided with the first openings, the barrier wall is made of an organic light shielding material, and the barrier wall forms the first light shielding layer;

[0185] (5) the pixel structure layer is formed on the substrate, a first planarization layer is formed on a surface of the pixel structure layer away from the substrate, the first planarization layer is made of an organic light shielding material, the first planarization layer is provided with the first openings, and the first planarization layer forms the first light shielding layer.

[0186] In an example embodiment, the color filter layer comprises color filters of different colors and a first black matrix arranged between the color filters of different colors, and before the fingerprint recognition sensor is attached below the substrate, the method further comprises:

[0187] opening a second opening on the first black matrix, a normal projection of the second opening on the substrate and a normal projection of the fingerprint recognition sensor on the substrate contain an overlapping area, the second opening images the fingerprint aperture in contact with the display panel onto the fingerprint recognition sensor, and the second opening forms the light transmission portion.

[0188] In another example embodiment, the color filter layer includes color filters of different colors and polarizers arranged between the color filters of different colors, the polarizers forming light transmission portions, and the first openings image the fingerprint apertures in contact with the display panel onto the fingerprint recognition sensor.

[0189] In an example embodiment, before forming the color filter layer above the first light shielding layer, the method further includes:

[0190] forming a touch structure layer above the first light shielding layer, the touch structure layer including a plurality of touch electrodes, a footprint of the touch electrodes on the substrate not overlapping a footprint of the organic light emitting layer on the substrate.

[0191] In another example embodiment, after forming the color filter layer above the first light shielding layer, the method further includes:

[0192] forming a touch structure layer and a second black matrix layer above the color filter layer, the second black matrix layer including a plurality of second black matrices, third openings being formed on the second black matrices, the touch structure layer including a plurality of touch electrodes; a footprint of the second black matrix on the substrate covering a footprint of the touch electrode on the substrate, and a footprint of the third opening on the substrate containing an overlapping area with a footprint of the first opening on the substrate.

[0193] The example embodiments also provide a method for manufacturing a display panel, including:

[0194] forming a driving structure layer above the substrate;

[0195] forming a fingerprint recognition sensor on a surface of the driving structure layer away from the substrate;

[0196] forming a first light shielding layer above the fingerprint recognition sensor, the first light shielding layer including first openings and light shielding portions;

[0197] forming a color filter layer above the first light shielding layer, the color filter layer including color filters of different colors and light transmission portions arranged between the color filters of different colors, the light transmission portions and the first openings being configured to allow fingerprint reflected light to pass through and reach the fingerprint recognition sensor, and the light shielding portions being configured to shield stray light.

[0198] In the example embodiments, the structure, materials, related parameters, and detailed manufacturing process of the display panel have been described in the foregoing embodiments, and will not be repeated here.

[0199] The method for manufacturing a display panel provided by the example embodiments shields stray light by the light shielding portions, allows fingerprint reflected light to pass through and reach the fingerprint recognition sensor by the light transmission portions and the first openings, and enables light to pass through the screen for fingerprint recognition without increasing power consumption. The manufacturing process is simple, the production efficiency is high, and the method has the advantages of low production cost, high yield, and good application prospect.

[0200] Seventh embodiment

[0201] The embodiments of the present application also provide a display device including the display panel of the foregoing embodiments. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.

[0202] In the description of the embodiments of the present application, it should be understood that the terms "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0203] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0204] Although the embodiments disclosed in the present application are as described above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present application, and is not intended to limit the present application. Any person skilled in the art can make any modification and change in the form and details without departing from the spirit and scope of the present application, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A display panel, characterized by, The display panel comprises a fingerprint identification sensor, a first light shielding layer arranged above the fingerprint identification sensor, and a color filter layer arranged above the first light shielding layer. The color filter layer comprises color filters of different colors and light transmission portions arranged between the color filters of different colors. The first light shielding layer comprises first openings and light shielding portions, the light transmission portions and the first openings are configured to allow the fingerprint reflected light to pass through and reach the fingerprint identification sensor, and the light shielding portions are configured to shield stray light. The color filter layer further comprises a first black matrix arranged between the color filters of different colors, the first black matrix is provided with second openings, the second openings form the light transmission portions, and a normal projection of the second openings on the substrate contains an overlapping area with a normal projection of the fingerprint identification sensor on the substrate, the second openings image the fingerprint pinhole in contact with the display panel onto the fingerprint identification sensor. The display panel further comprises a light filtering layer arranged above the fingerprint identification sensor and on a path through which the fingerprint reflected light passes through the first openings to reach the fingerprint identification sensor; or the display panel further comprises a spacer layer arranged on a pixel definition layer, the spacer layer contains a first color of filtering material and serves as the light filtering layer, and the first color of filtering material is configured to filter out light that interferes with the fingerprint reflected light.

2. The display panel of claim 1, wherein, The first openings and / or the second openings are circular in shape, and the diameter of the first openings and / or the second openings is between 3 microns and 30 microns.

3. The display panel of claim 1, wherein, The display panel comprises a substrate and a driving structure layer, a first planar layer, a light emitting structure layer, and an encapsulation layer arranged on the substrate in sequence. The driving structure layer comprises a first thin film transistor. The light emitting structure layer comprises a first electrode and a pixel definition layer, the first electrode is connected to the first thin film transistor in the driving structure layer through a via hole formed on the first planar layer, and the pixel definition layer comprises a plurality of pixel openings and a barrier wall around the pixel openings, and the pixel openings expose the first electrode. The color filter layer is arranged on the encapsulation layer.

4. The display panel of claim 3, wherein, The barrier wall is made of an organic light shielding material, the first openings are arranged on the barrier wall, and the barrier wall forms the light shielding portions; and the first planar layer is made of an organic light transmission material.

5. The display panel of claim 3, wherein, The light emitting structure layer comprises an organic light emitting layer arranged on the first electrode; and the display panel further comprises a touch structure layer arranged between the encapsulation layer and the color filter layer. The touch structure layer comprises a plurality of touch electrodes, a normal projection of the touch electrodes on the substrate does not overlap with a normal projection of the organic light emitting layer on the substrate.

6. The display panel of claim 5, wherein, A normal projection of the first black matrix on the substrate covers a normal projection of the touch electrodes on the substrate.

7. The display panel of claim 3, wherein, The first planar layer is made of an organic light shielding material, the first openings are arranged on the first planar layer, and the first planar layer forms the light shielding portions.

8. The display panel of claim 3, wherein, The driving structure layer comprises, in sequence and stacked on the substrate, a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, a first source-drain metal layer, a second interlayer insulating layer, and a second source-drain metal layer, the first opening is arranged on the second source-drain metal layer, and the second source-drain metal layer forms the first light shielding layer.

9. The display panel of claim 3, wherein, The driving structure layer comprises, in sequence and stacked on the substrate, a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, and a first source-drain metal layer, and the first light shielding layer is arranged between the substrate and the buffer layer.

10. The display panel of claim 3, wherein, The substrate comprises a first substrate and a second substrate, and the first light shielding layer is arranged between the first substrate and the second substrate.

11. The display panel of claim 3, wherein, The substrate is provided with a bottom film on a surface away from the driving structure layer, and the fingerprint recognition sensor is attached to a surface of the bottom film away from the substrate.

12. The display panel of claim 3, wherein, The fingerprint recognition sensor is arranged between the driving structure layer and the first flat layer, and the driving structure layer further comprises a second thin film transistor for opening or closing the fingerprint recognition sensor.

13. The display panel of claim 1, wherein, The display panel further comprises a cover plate, a distance between the cover plate and the second opening in a direction perpendicular to the display panel is greater than a distance between the second opening and the fingerprint recognition sensor in the direction perpendicular to the display panel, and an aperture of the second opening is less than or equal to an aperture of the first opening.

14. A display device comprising: The display panel comprises any one of claims 1 to 13. The display panel comprises any one of claims 1 to 13.

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