Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel comprises a substrate; the pixel definition layer is located on one side of the substrate, a plurality of first-class openings and a plurality of second-class openings are defined by the pixel definition layer, the first-class openings comprise first pixel openings, the second-class openings comprise first openings, and orthographic projections of the first pixel openings on the substrate surround orthographic projections of the first openings on the substrate; the light-emitting units comprise first light-emitting units, and at least part of the first light-emitting units are located in the first pixel openings; and at least part of the identification units are located in the first opening. According to the technical scheme, the sensitivity and the signal-to-noise ratio of fingerprint identification can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] With the development of display technology, display panels with fingerprint recognition function have become mainstream. At present, full-screen recognition can be achieved by integrating a fingerprint recognition module (e.g., an organic photoelectric sensor) into a display panel. However, the recognition accuracy of existing fingerprint recognition modules is low. Summary of the invention

[0003] In order to solve the above problems, embodiments of the present application provide a display panel and a display device.

[0004] In a first aspect, an embodiment of the present application provides a display panel, comprising: a substrate; a pixel definition layer, located on one side of the substrate, the pixel definition layer enclosing a plurality of first-type openings and a plurality of second-type openings, the first-type openings comprising a first pixel opening, the second-type openings comprising a first opening, the orthographic projection of the first pixel opening on the substrate surrounds the orthographic projection of the first opening on the substrate; a plurality of light-emitting units, the light-emitting units comprising a first light-emitting unit, at least some of the first light-emitting units being located in the first pixel opening; and a plurality of identification units, at least some of the identification units being located in the first opening.

[0005] In combination with the first aspect, the first type of opening also includes a second pixel opening, the light-emitting unit also includes a second light-emitting unit and a third light-emitting unit, and at least part of the second light-emitting unit and the third light-emitting unit are respectively located in the second pixel opening; preferably, the number ratio of the second light-emitting unit, the third light-emitting unit, the first light-emitting unit and the identification unit is 1:1:2:2; preferably, the first light-emitting unit includes a green light-emitting unit, the second light-emitting unit includes a red light-emitting unit, and the third light-emitting unit includes a blue light-emitting unit; preferably, the orthographic projection of the first pixel opening on the substrate is a U-shape; the orthographic projections of the second pixel opening and the first opening on the substrate are rhombuses; or, the orthographic projection of the first pixel opening on the substrate is a circular ring; the orthographic projections of the second pixel opening and the first opening on the substrate are circular.

[0006] In combination with the first aspect, the second type of opening also includes a second opening, which is arranged on the peripheral side of the first pixel opening, and part of the identification unit is located in the second opening; preferably, the number ratio of the second light-emitting unit, the third light-emitting unit, the first light-emitting unit, and the identification unit is 1:1:2:6; preferably, the orthographic projection of the second opening on the substrate is a rhombus or a circle; preferably, the second opening is located between two first pixel openings; preferably, the second opening is located between two second pixel openings.

[0007] In combination with the first aspect, the display panel further comprises a first isolation structure, which is located on the side of the pixel definition layer away from the substrate; the orthographic projection of the first isolation structure on the substrate surrounds the orthographic projection of the identification unit on the substrate; preferably, the first isolation structure comprises at least one first isolation column; preferably, the material of the first isolation structure comprises at least one of an organic material, an inorganic material, and a metal material; preferably, in a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the first isolation structure comprises at least one of a rectangle, a trapezoid or an inverted trapezoid; preferably, the first isolation structure comprises a first metal layer, a second metal layer and a third metal layer stacked in sequence in a direction away from the substrate; preferably, the materials of the first metal layer and the third metal layer comprise titanium, and the material of the second metal layer comprises aluminum ; Preferably, the display panel also includes a second isolation structure, which is located on the side of the pixel definition layer away from the substrate, and the orthographic projection of the second isolation structure on the substrate surrounds the orthographic projection of the first light-emitting unit on the substrate; Preferably, the second isolation structure includes at least one second isolation column; Preferably, the material of the second isolation structure includes at least one of an organic material, an inorganic material, and a metal material; Preferably, in a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the second isolation structure includes at least one of a rectangle, a trapezoid or an inverted trapezoid; Preferably, the second isolation structure includes a first metal layer, a second metal layer and a third metal layer stacked in sequence along a direction away from the substrate; Preferably, the material of the first metal layer and the third metal layer includes titanium, and the material of the second metal layer includes aluminum.

[0008] In combination with the first aspect, the identification unit includes a first electrode layer, a photoelectric conversion layer and a second electrode layer stacked in sequence along a direction away from the substrate, and the light-emitting unit includes a third electrode layer, a light-emitting layer and a fourth electrode layer stacked in sequence along a direction away from the substrate; the first electrode layer and the third electrode layer are arranged in the same layer, and the second electrode layer and the fourth electrode layer are arranged in the same layer; preferably, the display panel also includes a first film layer, a second film layer and a third film layer stacked in sequence and located on the side of the second electrode layer away from the substrate; preferably, the material of the first film layer includes silicon oxide, the material of the second film layer includes acrylic polymer, and the material of the third film layer includes silicon nitride; preferably, the refractive index of the first film layer is 1.4 to 1.8, the refractive index of the second film layer is 1.8 to 1.9, and the refractive index of the third film layer is 1.8 to 2.1; preferably, in a direction perpendicular to the plane of the substrate, the thickness of the first film layer is 0.2μm to 1μm, the thickness of the second film layer is 6μm to 20μm, and the thickness of the third film layer is 0.2μm to 1μm.

[0009] In combination with the first aspect, the display panel also includes a first light regulating structure, which is arranged between the second film layer and the third film layer, and the orthographic projection of the first light regulating structure on the substrate surrounds the orthographic projection of the first type of opening on the substrate; or, the display panel includes a first light regulating structure and a fourth film layer, the fourth film layer is located on the side of the third film layer away from the substrate, the first light regulating structure is located between the third film layer and the fourth film layer, and the orthographic projection of the first light regulating structure on the substrate surrounds the orthographic projection of the first type of opening on the substrate; preferably, the refractive index of the first light regulating structure is 1.3 to 1.6, and the refractive index of the fourth film layer is 1.7 to 1.9; preferably, the material of the first light regulating structure includes organic material, and the material of the fourth film layer includes organic material.

[0010] In combination with the first aspect, the display panel also includes a second light regulating structure, which is arranged between the first film layer and the second film layer, and the orthographic projection of the second light regulating structure on the substrate at least covers the orthographic projection of the first light-emitting unit on the substrate; preferably, the second light regulating structure is a convex lens structure; preferably, the refractive index of the second light regulating structure is greater than the refractive index of the first film layer and less than the refractive index of the second film layer; preferably, the refractive index of the second light regulating structure is 1.7 to 1.9.

[0011] In combination with the first aspect, the display panel also includes a third light adjustment structure, which is located between the first film layer and the second film layer, and the orthographic projection of the third light adjustment structure on the substrate at least covers the orthographic projection of the identification unit on the substrate; preferably, the third light adjustment structure includes a plurality of convex lenses; preferably, on a cross section perpendicular to the substrate, the maximum length of the convex lens in a direction parallel to the plane of the substrate is 1 to 5 μm, and the maximum height of the convex lens in a direction perpendicular to the plane of the substrate is 0.2 to 1.5 μm; preferably, the refractive index of the third light adjustment structure is less than the refractive index of the second film layer; preferably, the refractive index of the third light adjustment structure is 1.4 to 1.6.

[0012] In combination with the first aspect, the display panel also includes a skin material layer located on the side of the third film layer away from the substrate, and a groove is provided on the side of the skin material layer close to the substrate, and the orthographic projection of the groove on the substrate overlaps with the orthographic projection of the identification unit on the substrate.

[0013] In a second aspect, an embodiment of the present application provides a display device, comprising the above-mentioned display panel.

[0014] Through the above technical solution, the recognition unit is set inside the first light-emitting unit (green light-emitting unit), which can increase the absorption of green light and improve the sensitivity of fingerprint recognition; it can also reduce the absorption of other light and improve the signal-to-noise ratio of fingerprint recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1FIG. 1 is a schematic diagram of a pixel arrangement of a repeating unit of a display panel provided by an embodiment of the present application.

[0016] Figure 2 FIG. 4 is a schematic diagram of a pixel arrangement of a repeating unit of a display panel provided in another embodiment of the present application.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of a display panel provided in one embodiment of the present application.

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0020] Figure 6 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0021] Figure 7 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0022] Figure 8 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0023] Fig. 9 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0024] Fig.10 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0025] Fig.11 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application.

[0026] Fig.12 It is a schematic diagram of the structure of a display device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Organic Light-Emitting Diode (OLED) devices have become the next generation display technology with great competitiveness and development prospects due to their advantages such as all-solid-state structure, high brightness, full viewing angle, fast response speed, and flexible display. OLED devices have a three-layer structure of anode, light-emitting layer, and cathode. Similar to OLED devices, organic photodiodes (OPD) also have a three-layer structure, namely, a first electrode, a photosensitive layer, and a second electrode. Therefore, OPD can share a common layer with OLED, and OPD can be prepared by evaporation, simplifying the preparation process of OPD.

[0029] The working principle of OPD is to receive the light reflected by the finger and convert the light signal into an electrical signal, thereby realizing the user's fingerprint recognition. The inventor found that the wavelength of light that OPD can receive is mainly concentrated in the green light wavelength region, that is, OPD is more sensitive to green light, and using green light as the light source for fingerprint recognition has a relatively high signal-to-noise ratio. However, since OPD is integrated into the display panel, OPD also has a certain absorption of blue light and red light, which will reduce the signal-to-noise ratio of fingerprint recognition; in addition, the light emitted by OLED may be directly captured by the OPD device without reflection, which will also reduce the signal-to-noise ratio of fingerprint recognition.

[0030] In view of the above technical problems, an embodiment of the present application provides a display panel, which includes a substrate; a pixel definition layer, which is located on one side of the substrate, and the pixel definition layer encloses a plurality of first-type openings and a plurality of second-type openings, wherein the first-type openings include a first pixel opening, and the second-type openings include a first opening, and the orthographic projection of the first pixel opening on the substrate surrounds the orthographic projection of the first opening on the substrate; a plurality of light-emitting units, wherein the light-emitting units include a first light-emitting unit, and at least part of the first light-emitting units are located in the first pixel opening; and a plurality of identification units, at least part of the identification units are located in the first opening. In the embodiment of the present application, the identification unit is arranged inside the first light-emitting unit (green light-emitting unit), which can increase the absorption of green light and improve the sensitivity of fingerprint recognition; it can also reduce the absorption of other light and improve the signal-to-noise ratio of fingerprint recognition.

[0031] Figure 1 FIG. 1 is a schematic diagram of a pixel arrangement of a repeating unit of a display panel provided by an embodiment of the present application. Figure 2 FIG. 4 is a schematic diagram of a pixel arrangement of a repeating unit of a display panel provided in another embodiment of the present application. Figure 3 is a schematic diagram of a cross-sectional structure of a display panel provided in an embodiment of the present application. Specifically, Figure 3 This application Figure 1 The cross-sectional structure diagram of the display panel along line AB is shown. Figure 4is a schematic diagram of a cross-sectional structure of a display panel provided by another embodiment of the present application. Specifically, Figure 4 This application Figure 2 The cross-sectional structure diagram of the display panel along the CD line is shown.

[0032] like Figure 1 and Figure 3 As shown, the display panel includes a substrate 10 , a pixel definition layer 20 , a plurality of light emitting units 30 and a plurality of identification units 40 .

[0033] In an embodiment of the present application, the substrate 10 includes a rigid substrate, such as a glass substrate; or, the substrate 10 includes a flexible substrate, such as polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc.

[0034] The pixel definition layer 20 is located on one side of the substrate 10. In the embodiment of the present application, the pixel definition layer 20 includes an organic material or an inorganic material, which is not limited in the present application. The pixel definition layer 20 encloses a plurality of first-type openings 210 and a plurality of second-type openings 220. The first-type openings 210 include a first pixel opening 211 and a second pixel opening 212, and the second-type openings 220 include a plurality of first openings 221, and the orthographic projection of the first pixel opening 211 on the substrate 10 surrounds the orthographic projection of the first opening 221 on the substrate 10. Specifically, the orthographic projection of the first pixel opening 211 on the substrate 10 is a ring, surrounding the orthographic projection of the first opening 221 on the substrate 10.

[0035] The plurality of light-emitting units 30 include a first light-emitting unit 31, and the first light-emitting unit 31 includes a green light-emitting unit. At least part of the first light-emitting unit 31 is located in the first pixel opening 211, and at least part of the identification unit 40 is located in the first opening 221. In the embodiment of the present application, the identification unit 40 is arranged inside the first light-emitting unit 31, which can increase the absorption of green light and improve the sensitivity of fingerprint recognition; it can also reduce the absorption of other light and improve the signal-to-noise ratio of fingerprint recognition.

[0036] Continue to refer Figure 1 and Figure 3 , the light-emitting unit 30 also includes a second light-emitting unit 32 and a third light-emitting unit 33. At least part of the second light-emitting unit 32 and the third light-emitting unit 33 are respectively located in the second pixel opening 212. In the embodiment of the present application, the second light-emitting unit 32 includes a red light-emitting unit, and the third light-emitting unit 33 includes a blue light-emitting unit. In the embodiment of the present application, the number ratio of the second light-emitting unit, the third light-emitting unit, the first light-emitting unit and the identification unit is 1:1:2:2. Figure 1In the figure, the orthographic projection of the first pixel opening 211 on the substrate 10 is a U-shaped shape, and the orthographic projections of the second pixel opening 212 and the first opening 221 on the substrate 10 are a rhombus shape. It can be understood that in other embodiments, the first type of opening and the second type of opening can also be other shapes. For example, the orthographic projection of the first pixel opening on the substrate is a circular ring, and the orthographic projections of the second pixel opening and the first opening on the substrate are circular.

[0037] In some embodiments, in order to improve the precision and accuracy of fingerprint recognition, a recognition unit 40 is arranged around the first light emitting unit 31. Figure 2 and Figure 4 As shown, the second type of opening 220 also includes a second opening 222, and the second opening 222 is arranged on the peripheral side of the first pixel opening 211. Part of the identification unit 40 is located in the first opening 221, and part of the identification unit 40 is located in the second opening 222. In the embodiment of the present application, the number ratio of the second light-emitting unit 32, the third light-emitting unit 33, the first light-emitting unit 31 and the identification unit 40 is 1:1:2:6. The second opening 222 has the same shape as the first opening 221, for example, the orthographic projection of the second opening 222 on the substrate 10 is a rhombus or a circle. Optionally, the second opening 222 is located between two first pixel openings 211. Optionally, the second opening 222 is located between two second pixel openings 212. In the embodiment of the present application, the identification unit 40 is arranged inside and around the first light-emitting unit 31 at the same time, which can improve the precision and accuracy of fingerprint recognition.

[0038] It should be noted that Figure 1 and Figure 2 Only two pixel arrangement modes are shown, and those skilled in the art can select a suitable arrangement mode according to actual conditions. As long as the identification unit 40 is provided inside the first light-emitting unit 31, or inside and around the first light-emitting unit 31, it falls within the protection scope of the present application.

[0039] Continue to refer Figure 3 and Figure 4, the light-emitting unit 30 includes an OLED, and the identification unit 40 includes an OPD. The identification unit 40 includes a first electrode layer 410, a photoelectric conversion layer 420, and a second electrode layer 430 stacked in sequence in a direction away from the substrate 10. The light-emitting unit 30 (for example, the first light-emitting unit 31, the second light-emitting unit 32) includes a third electrode layer 310, a light-emitting layer 320, and a fourth electrode layer 330 stacked in sequence in a direction away from the substrate 10. The first electrode layer 410 and the third electrode layer 310 are arranged in the same layer, and the materials of the first electrode layer 410 and the third electrode layer 310 are the same. The second electrode layer 430 and the fourth electrode layer 330 are arranged in the same layer. In the embodiment of the present application, the second electrode layer 430 and the fourth electrode layer 330 can be arranged at intervals or connected to each other. When preparing the second electrode layer 430 (or the fourth electrode layer 330), a whole electrode layer can be formed, and the electrode layers in different regions constitute the second electrode layer 430 and the fourth electrode layer 330 respectively. The light-emitting unit 30 also includes a light-emitting functional layer. Specifically, the first light-emitting unit 31 includes a first light-emitting functional layer 321 (ie, a green light-emitting functional layer), the second light-emitting unit 32 includes a second light-emitting functional layer 322 (ie, a red light-emitting functional layer), and the third light-emitting unit 33 includes a third light-emitting functional layer (ie, a blue light-emitting functional layer).

[0040] Continue to refer Figure 3 and Figure 4 , the display panel also includes a first film layer 610, a second film layer 620 and a third film layer 630 stacked in sequence on the side of the second electrode layer 430 away from the substrate 10. The first film layer 610, the second film layer 620 and the third film layer 630 constitute the encapsulation layer of the display panel. The material of the first film layer 610 includes silicon oxide, the material of the second film layer 620 includes an acrylic polymer, and the material of the third film layer 630 includes silicon nitride. In the direction perpendicular to the plane where the substrate is located, the thickness of the first film layer 610 is 0.2μm to 1μm, the thickness of the second film layer 620 is 6μm to 20μm, and the thickness of the third film layer 630 is 0.2μm to 1μm. Exemplarily, the thickness of the first film layer 610 is 0.2μm, 0.4μm, 0.6μm, 0.8μm, and 1μm. The thickness of the second film layer 620 is 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, and 20 μm. The thickness of the third film layer 630 is 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, and 1 μm.

[0041] Optionally, the refractive index of the first film layer 610 is 1.4 to 1.8, the refractive index of the second film layer 620 is 1.8 to 1.9, and the refractive index of the third film layer 630 is 1.8 to 2.1. Exemplarily, the refractive index of the first film layer 610 is 1.4, 1.5, 1.6, 1.7, 1.8. The refractive index of the second film layer 620 is 1.8, 1.82, 1.85, 1.87, 1.9. The refractive index of the third film layer 630 is 1.8, 1.95, 1.9, 1.95, 2, 2.05, 2.1. Preferably, the refractive index of the first film layer 610 is smaller than that of the second film layer 620, and the refractive index of the second film layer 620 is smaller than that of the third film layer 630. In this way, the light emitted by the first light-emitting unit 31 can be converged to the center, so that the recognition unit 40 can receive more light and improve the sensitivity of fingerprint recognition.

[0042] Continue to refer Figures 1 to 4 The display panel further includes a first isolation structure 510. The first isolation structure 510 is located on the side of the pixel definition layer 20 away from the substrate 10, and the orthographic projection of the first isolation structure 510 on the substrate 10 surrounds the orthographic projection of the identification unit 40 on the substrate 10. By providing the first isolation structure 510, light that is not reflected by the finger can be blocked, and light that is not reflected by the finger can be prevented from being directly captured by the identification unit 20, thereby reducing signal interference and improving the signal-to-noise ratio of fingerprint identification.

[0043] In an embodiment of the present application, the first isolation structure 510 includes at least one first isolation column. The more isolation columns there are, the better the blocking effect is, but it will occupy a larger space, and the first film layer 610 is filled between the multiple first isolation columns. Preferably, the first isolation structure 510 includes two first isolation columns. The material of the first isolation structure 510 includes at least one of an organic material, an inorganic material, and a metal material. Optionally, in a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the first isolation structure 510 includes at least one of a rectangle, a trapezoid, or an inverted trapezoid. Exemplarily, the first isolation structure 510 includes a first metal layer, a second metal layer, and a third metal layer stacked in sequence in a direction away from the substrate 10. The materials of the first metal layer and the third metal layer include titanium, and the material of the second metal layer includes aluminum.

[0044] It should be noted that the following embodiments are described only by taking the case where the identification unit 40 is arranged inside the first light-emitting unit 31 as an example. It can be understood that the following embodiments are also applicable to the case where the identification unit 40 is arranged inside and around the first light-emitting unit 31 at the same time.

[0045] In the embodiment of the present application, in order to block the unreflected red light and blue light, and block the reflected red light and blue light, the display panel is further provided with an isolation structure around the first light emitting unit. Figure 5 . Figure 5It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Figure 5 The display panel shown is Figure 4 The difference of the display panel shown is that the display panel also includes a second isolation structure 520. The second isolation structure 520 is located on the side of the pixel definition layer 20 away from the substrate 10, and the orthographic projection of the second isolation structure 520 on the substrate 10 surrounds the orthographic projection of the first light-emitting unit 31 on the substrate 10. Optionally, the second isolation structure includes at least one second isolation column 520. Preferably, the second isolation structure includes two second isolation columns, and the first film layer 610 is filled between the plurality of second isolation columns 520. In the embodiment of the present application, the material of the second isolation structure 520 includes at least one of an organic material, an inorganic material, and a metal material. Optionally, in a direction perpendicular to the plane where the substrate 10 is located, the cross-sectional shape of the second isolation structure 520 includes at least one of a rectangle, a trapezoid, or an inverted trapezoid. Optionally, the second isolation structure 520 includes a first metal layer, a second metal layer, and a third metal layer stacked in sequence in a direction away from the substrate 10. The materials of the first metal layer and the third metal layer include titanium, and the material of the second metal layer includes aluminum. By providing the second isolation structure 520, blue light and red light can be further blocked, thereby improving the signal-to-noise ratio of fingerprint recognition.

[0046] Figure 6 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Figure 6 The display panel shown is Figure 5 The difference of the display panel shown is that the display panel also includes a first light regulating structure 710. The first light regulating structure 710 is arranged between the second film layer 620 and the third film layer 630, and the orthographic projection of the first light regulating structure 710 on the substrate 10 surrounds the orthographic projection of the first type of opening 210 on the substrate 10. Optionally, the material of the first light regulating structure 710 includes an organic material, and the refractive index of the first light regulating structure 710 is 1.3 to 1.6. Exemplarily, the refractive index of the first light regulating structure 710 is 1.3, 1.4, 1.5, and 1.6. In an embodiment of the present application, the third film layer 630 and the first light regulating structure 710 form a high-low refracting interface, and large-angle light will be totally reflected at the high-low refracting interface, thereby changing the optical path of the large-angle light. Specifically, as Figure 6As shown, when the large-angle green light emitted by the first light-emitting unit 31 irradiates the first light-adjusting structure 710, total reflection occurs, and the optical path of the green light changes from outward divergence to inward convergence. After the light is reflected by the finger, it can be received by the recognition unit 40 disposed inside the first light-emitting unit 31, thereby increasing the amount of light incident on the recognition unit 40, thereby improving the sensitivity of fingerprint recognition. In addition, when the large-angle red light emitted by the second light-emitting unit 32 (or the large-angle blue light emitted by the third light-emitting unit 33) irradiates the first light-adjusting structure 710, total reflection occurs, and the optical path of the red light (or blue light) changes from outward divergence to inward convergence. After the light is reflected by the finger, it will not be received by the recognition unit 40, thereby improving the signal-to-noise ratio of fingerprint recognition.

[0047] Figure 7 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Figure 7 The display panel shown is Figure 6 The difference of the display panel shown is that the display panel also includes a fourth film layer 640. The fourth film layer 640 is located on the side of the third film layer 630 away from the substrate 10, the first light adjustment structure 710 is located between the third film layer 630 and the fourth film layer 640, and the orthographic projection of the first light adjustment structure 710 on the substrate 10 surrounds the orthographic projection of the first type of opening 210 on the substrate 10. In the embodiment of the present application, the material of the first light adjustment structure 710 includes an organic material, and the material of the fourth film layer 640 includes an organic material. The refractive index of the first light adjustment structure 710 is 1.3 to 1.6, and the refractive index of the fourth film layer 640 is 1.7 to 1.9. Exemplarily, the refractive index of the first light adjustment structure 710 is 1.3, 1.4, 1.5, 1.6. The refractive index of the fourth film layer 640 is 1.7, 1.75, 1.8, 1.85, 1.9. It should be noted that, in order to ensure that the light emitted by the first light-emitting unit 31 converges toward the center, optionally, the refractive index of the fourth film layer 640 is greater than the refractive index of the third film layer 630. The fourth film layer 640 and the first light adjustment structure 710 form a high-low refraction interface, and the large-angle light will be totally reflected at the high-low refraction interface, changing the optical path of the large-angle light. In this way, on the one hand, the green light can be converged toward the center, and the recognition unit 40 can receive more green light, thereby improving the sensitivity of fingerprint recognition; on the other hand, the absorption of red light and blue light by the recognition unit 40 can be reduced, thereby improving the signal-to-noise ratio of fingerprint recognition.

[0048] Figure 8 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Figure 8 The display panel shown is Figure 5The difference of the display panel shown is that the display panel also includes a second light adjustment structure 720. The second light adjustment structure 720 is arranged between the first film layer 610 and the second film layer 620, and the orthographic projection of the second light adjustment structure 720 on the substrate 10 at least covers the orthographic projection of the first light emitting unit 31 on the substrate 10. Optionally, the second light adjustment structure 720 is a convex lens structure. Optionally, the material of the second light adjustment structure 720 includes an organic material. The refractive index of the second light adjustment structure 720 is 1.7 to 1.9. Exemplarily, the refractive index of the second light adjustment structure 720 is 1.7, 1.75, 1.8, 1.85, 1.9. In the embodiment of the present application, by setting the second light adjustment structure, the light emitted by the first light emitting unit 31 can be converged to the center, and the light output intensity of the light can be enhanced, so that the recognition unit 40 can receive more reflected light and improve the sensitivity of fingerprint recognition. Optionally, in order to ensure that the light emitted by the first light emitting unit 31 converges toward the center, the refractive index of the second light regulating structure 720 is greater than the refractive index of the first film layer 610 and less than the refractive index of the second film layer 620. It should be noted that the first light regulating structure 710 and the second light regulating structure 720 can be used at the same time, and this application does not limit this.

[0049] Fig. 9 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Fig. 9The difference between the display panel shown in FIG. 5 and the display panel shown in FIG. 5 is that the display panel further includes a third light adjustment structure 730. The third light adjustment structure 730 is located between the first film layer 610 and the second film layer 620, and the orthographic projection of the third light adjustment structure 730 on the substrate 10 at least covers the orthographic projection of the identification unit 40 on the substrate 10. Optionally, the third light adjustment structure 730 includes a plurality of convex lenses. Optionally, on a cross section perpendicular to the substrate 10, the maximum length of the convex lens in the direction parallel to the plane where the substrate 10 is located is 1 to 5 μm, and the maximum height of the convex lens in the direction perpendicular to the plane where the substrate 10 is located is 0.2 to 1.5 μm. Exemplarily, the maximum length of the convex lens in the direction parallel to the plane where the substrate 10 is located is 1um, 2um, 3um, 4um, 5um. The maximum height of the convex lens in the direction perpendicular to the plane where 10 is located is 0.2um, 0.4um, 0.6um, 0.8um, 1um, 1.2um, 1.5um. Optionally, the refractive index of the third light adjustment structure 730 is less than the refractive index of the second film layer 620. The material of the third light adjustment structure 730 includes an organic material. Optionally, the refractive index of the third light adjustment structure 730 is 1.4 to 1.6. Exemplarily, the refractive index of the third light adjustment structure 730 is 1.4, 1.45, 1.5, 1.55, 1.6. In the embodiment of the present application, by setting the third light adjustment structure 730, the light reflected by the finger can be refracted multiple times at the third light adjustment structure 730, so that the refracted light is dispersed, so that it is fully received by the recognition unit 40, and the sensitivity of fingerprint recognition is improved.

[0050] Optionally, the first light adjustment structure 710 and the third light adjustment structure 730 may be used simultaneously. Fig.10 FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel provided by another embodiment of the present application. Fig.10 As shown, the display panel includes a first light adjustment structure 710 and a third light adjustment structure 730. By simultaneously providing the first light adjustment structure 710 and the third light adjustment structure 730, on the one hand, more reflected green light can be irradiated to the recognition unit 40, while reducing the reception of blue light or red light by the recognition unit 40, thereby improving the signal-to-noise ratio of fingerprint recognition; on the other hand, the reflected green light can be fully absorbed by the recognition unit 40, thereby improving the sensitivity of fingerprint recognition.

[0051] Fig.11 It is a schematic diagram of the cross-sectional structure of a display panel provided in yet another embodiment of the present application. Fig.11 The display panel shown is Fig.10The difference of the display panel shown is that the display panel also includes a skin material layer 80. The skin material layer 80 is located on the side of the fourth film layer 640 (or the third film layer 630) away from the substrate 10. A groove 801 is provided on the side of the skin material layer 80 close to the substrate 10, and the orthographic projection of the groove 801 on the substrate 10 overlaps with the orthographic projection of the identification unit 40 on the substrate 10. Optionally, the groove 801 is formed by etching the skin material layer 80. Since the light transmittance of the skin material layer 80 is low, the light irradiated to the identification unit 40 will be reduced. By providing the groove 801 and thinning the skin material layer 80 above the identification unit 40, the light transmittance can be improved and the influence of the skin material layer 80 on fingerprint recognition can be reduced.

[0052] In a second aspect, an embodiment of the present application provides a display device, which includes the display panel in the above embodiment.

[0053] Fig.12 is a schematic diagram of the structure of a display device provided by an embodiment of the present application. Fig.12 As shown, the display device 1200 is a product with an image display function. For example, the display device 1200 can be used to display static images, such as pictures or photos. The display device 1200 can also be used to display dynamic images, such as videos.

[0054] The display device 1200 may be a laptop computer, a mobile phone, a handheld or portable computer, a camera, a camcorder, a vehicle-mounted smart central control screen, a calculator, a smart watch, a GPS navigator, an electronic photo, an electronic billboard or sign, a projector, etc.

[0055] The display device 1200 includes a display panel provided by any of the above embodiments, which may be an organic light emitting diode display panel or a quantum dot electroluminescent display panel.

[0056] In addition, the display device 1200 may also have functions such as taking photos, recording videos, fingerprint recognition, and face recognition. Accordingly, the display device 1200 also includes at least one functional module for implementing the above functions, such as an under-screen camera, an under-screen fingerprint recognition sensor, and the like.

[0057] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0058] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0059] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0060] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0061] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display panel, characterized in that: Comprising: Substrate; Pixel definition layer, located on one side of the substrate, the pixel definition layer enclosing a plurality of first - type openings and a plurality of second - type openings, the first - type openings including first pixel openings, the second - type openings including first openings, and the orthographic projection of the first pixel openings on the substrate surrounding the orthographic projection of the first openings on the substrate; A plurality of light - emitting units, the light - emitting units including first light - emitting units, and at least part of the first light - emitting units being located within the first pixel openings; A plurality of identification units, and at least part of the identification units being located within the first openings.

2. The display panel according to claim 1, characterized in that: The first - type openings further include second pixel openings, the light - emitting units further include second light - emitting units and third light - emitting units, and at least part of the second light - emitting units and the third light - emitting units are respectively located within the second pixel openings; Preferably, the number ratio of the second light - emitting units, the third light - emitting units, the first light - emitting units, and the identification units is 1:1:2:2; Preferably, the first light - emitting units include green light - emitting units, the second light - emitting units include red light - emitting units, and the third light - emitting units include blue light - emitting units; Preferably, the orthographic projection of the first pixel openings on the substrate is in a shape of a double - square; The orthographic projections of the second pixel openings and the first openings on the substrate are in a shape of a rhombus; Or, the orthographic projection of the first pixel openings on the substrate is in a shape of an annular ring; The orthographic projections of the second pixel openings and the first openings on the substrate are in a shape of a circle.

3. The display panel according to claim 2, characterized in that: The second - type openings further include second openings, the second openings are arranged on the peripheral side of the first pixel openings, and part of the identification units are located within the second openings; Preferably, the number ratio of the second light - emitting units, the third light - emitting units, the first light - emitting units, and the identification units is 1:1:2:6; Preferably, the orthographic projection of the second openings on the substrate is in a shape of a rhombus or a circle; Preferably, the second openings are located between two of the first pixel openings; Preferably, the second openings are located between two of the second pixel openings.

4. The display panel according to any one of claims 1 to 3, characterized in that: Further comprising a first isolation structure, located on the side of the pixel definition layer背离 from the substrate; the orthographic projection of the first isolation structure on the substrate surrounding the orthographic projection of the identification units on the substrate; Preferably, the first isolation structure includes at least one first isolation post; Preferably, the material of the first isolation structure includes at least one of organic materials, inorganic materials, and metal materials; Preferably, in the direction perpendicular to the plane of the substrate, the cross - sectional shape of the first isolation structure includes at least one of a rectangle, a trapezoid, or an inverted trapezoid; Preferably, the first isolation structure includes a first metal layer, a second metal layer, and a third metal layer stacked in sequence in the direction背离 from the substrate; Preferably, the materials of the first metal layer and the third metal layer include titanium, and the material of the second metal layer includes aluminum; Preferably, the display panel further comprises a second isolation structure, which is located on a side of the pixel definition layer away from the substrate, and an orthographic projection of the second isolation structure on the substrate surrounds an orthographic projection of the first light emitting unit on the substrate; Preferably, the second isolation structure comprises at least one second isolation column; Preferably, the material of the second isolation structure includes at least one of an organic material, an inorganic material, and a metal material; Preferably, in a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the second isolation structure includes at least one of a rectangle, a trapezoid or an inverted trapezoid; Preferably, the second isolation structure comprises a first metal layer, a second metal layer and a third metal layer stacked in sequence in a direction away from the substrate; Preferably, the materials of the first metal layer and the third metal layer include titanium, and the material of the second metal layer includes aluminum.

5. The display panel according to claim 1, characterized in that: The identification unit includes a first electrode layer, a photoelectric conversion layer, and a second electrode layer stacked in sequence in a direction away from the substrate, and the light-emitting unit includes a third electrode layer, a light-emitting layer, and a fourth electrode layer stacked in sequence in a direction away from the substrate; The first electrode layer and the third electrode layer are arranged in the same layer, and the second electrode layer and the fourth electrode layer are arranged in the same layer; Preferably, the display panel further comprises a first film layer, a second film layer and a third film layer stacked in sequence and located on a side of the second electrode layer away from the substrate; Preferably, the material of the first film layer includes silicon oxide, the material of the second film layer includes acrylic polymer, and the material of the third film layer includes silicon nitride; Preferably, the refractive index of the first film layer is 1.4 to 1.8, the refractive index of the second film layer is 1.8 to 1.9, and the refractive index of the third film layer is 1.8 to 2.1; Preferably, in a direction perpendicular to the plane where the substrate is located, the thickness of the first film layer is 0.2 μm to 1 μm, the thickness of the second film layer is 6 μm to 20 μm, and the thickness of the third film layer is 0.2 μm to 1 μm.

6. The display panel according to claim 5, characterized in that: Also included is a first light regulating structure, the first light regulating structure is disposed between the second film layer and the third film layer, and the orthographic projection of the first light regulating structure on the substrate surrounds the orthographic projection of the first type of opening on the substrate; Alternatively, the display panel includes a first light regulating structure and a fourth film layer, the fourth film layer is located on a side of the third film layer away from the substrate, the first light regulating structure is located between the third film layer and the fourth film layer, and the orthographic projection of the first light regulating structure on the substrate surrounds the orthographic projection of the first type of opening on the substrate; Preferably, the refractive index of the first light regulating structure is 1.3 to 1.6, and the refractive index of the fourth film layer is 1.7 to 1.9; Preferably, the material of the first light regulating structure includes organic material, and the material of the fourth film layer includes organic material.

7. The display panel according to claim 5 or 6, characterized in that: It also includes a second light regulating structure, which is disposed between the first film layer and the second film layer, and the orthographic projection of the second light regulating structure on the substrate at least covers the orthographic projection of the first light emitting unit on the substrate; Preferably, the second light adjustment structure is a convex lens structure; Preferably, the refractive index of the second light regulating structure is greater than the refractive index of the first film layer and less than the refractive index of the second film layer; Preferably, the refractive index of the second light regulating structure is 1.7-1.

9.

8. The display panel according to claim 5 or 6, characterized in that: It also includes a third light regulating structure, the third light regulating structure is located between the first film layer and the second film layer, and the orthographic projection of the third light regulating structure on the substrate at least covers the orthographic projection of the identification unit on the substrate; Preferably, the third light adjustment structure comprises a plurality of convex lenses; Preferably, on a cross section perpendicular to the substrate, the maximum length of the convex lens in a direction parallel to the plane where the substrate is located is 1 to 5 μm, and the maximum height of the convex lens in a direction perpendicular to the plane where the substrate is located is 0.2 to 1.5 μm; Preferably, the refractive index of the third light regulating structure is smaller than the refractive index of the second film layer; Preferably, the refractive index of the third light regulating structure is 1.4-1.

6.

9. The display panel according to claim 5 or 6, characterized in that: It also includes a skin material layer located on the side of the third film layer away from the substrate. The skin material layer is provided with a groove on the side close to the substrate. The orthographic projection of the groove on the substrate overlaps with the orthographic projection of the identification unit on the substrate.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

Images