Display panel and display device

Abstract

Embodiments of the present invention provide a display panel and display device, relating to the field of display technology, for improving the sensitivity of fingerprint recognition. The display panel includes: a substrate; subpixels located on one side of the substrate; a fingerprint sensor located on a side of the substrate away from the light-emitting side of the display panel; and a reflective portion located perpendicular to the plane of the substrate, between the fingerprint sensor and the light-emitting side of the subpixel display panel. The reflective portion is configured to enhance the intensity of light entering the fingerprint sensor.

Description

Technical field

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

[0002] In recent years, with the continuous development of display technology, more and more display devices have adopted fingerprint recognition to achieve user privacy protection. When users operate display devices with fingerprint recognition functions, they only need to touch the display screen with their fingers to complete the authorization verification, which is very simple to operate.

[0003] Existing display panels with fingerprint recognition require a fingerprint sensor installed within the display panel. Light from a light source is reflected off the finger and enters the fingerprint sensor, which then identifies the fingerprint based on the intensity of the reflected light from the valleys and ridges of the fingerprint. However, the sensitivity of fingerprint recognition is relatively poor due to the structure of existing display panels. [Summary of the invention]

[0004] In view of this, embodiments of the present invention provide a display panel and a display device to improve the sensitivity of fingerprint recognition.

[0005] In one aspect, an embodiment of the present invention provides a display panel, including:

[0006] substrate;

[0007] a sub-pixel located on one side of the substrate;

[0008] a fingerprint sensor, located on a side of the substrate away from the light-emitting side of the display panel;

[0009] A reflective portion is located between the fingerprint sensor and the sub-pixel in a direction perpendicular to the plane of the substrate; the reflective portion is used to enhance the intensity of light entering the fingerprint sensor.

[0010] On the other hand, an embodiment of the present invention provides a display device including the above-mentioned display panel.

[0011] The display panel and display device provided by the embodiments of the present invention, by providing a reflective portion in the display panel, can adjust the propagation direction of light that originally cannot be used by the fingerprint sensor by re-reflecting part of the fingerprint reflected light, so that it can enter the fingerprint sensor, thereby enhancing the light intensity entering the fingerprint sensor and improving the sensitivity of fingerprint recognition.

[0012] Furthermore, the embodiment of the present invention multiplexes sub-pixels as the light source required for the operation of the fingerprint sensor, eliminating the need for an additional fingerprint recognition light source in the display panel, thereby simplifying the structure of the display panel.

[0013] In addition, by positioning the reflective portion between the fingerprint sensor and the sub-pixel in a direction perpendicular to the substrate plane, the embodiment of the present invention can prevent the reflective portion from affecting the normal light emission of the sub-pixel. When the display panel is used for fingerprint recognition, this arrangement ensures that the light emitted by the sub-pixel is not affected by the reflective portion during its journey to the finger. Furthermore, when the display panel is displaying, the arrangement of the embodiment of the present invention can ensure that the sub-pixel emits light normally, which helps to ensure the normal display effect of the display panel.

Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic top view of a display panel provided by an embodiment of the present invention;

[0016] Figure 2 A schematic cross-sectional view of a display panel provided by an embodiment of the present invention;

[0017] Figure 3 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0018] Figure 4 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0019] Figure 5 for Figure 4 An enlarged schematic diagram of the first reflective portion, the second reflective portion, the fingerprint sensor, and the finger;

[0020] Figure 6 A schematic cross-sectional view of another first reflective portion provided by an embodiment of the present invention;

[0021] Figure 7 A schematic cross-sectional view of another first reflective portion provided by an embodiment of the present invention;

[0022] Figure 8 A schematic cross-sectional view of another first reflective portion provided by an embodiment of the present invention;

[0023] Figure 9 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0024] Figure 10 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0025] Figure 11 A schematic diagram of the optical path of fingerprint reflected light passing through the fourth reflecting part;

[0026] Figure 12 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0027] Figure 13 A schematic diagram of a display device provided by an embodiment of the present invention. [Specific implementation method]

[0028] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0030] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0031] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0032] It should be understood that although the terms "first," "second," "third," etc. may be used to describe the reflective portions in embodiments of the present invention, these reflective portions should not be limited to these terms. These terms are merely used to distinguish one reflective portion from another. For example, without departing from the scope of embodiments of the present invention, the first reflective portion may also be referred to as the second reflective portion, and similarly, the second reflective portion may also be referred to as the first reflective portion.

[0033] An embodiment of the present invention provides a display panel, such as Figure 1 and Figure 2 As shown, Figure 1 A schematic top view of a display panel provided by an embodiment of the present invention is shown. Figure 2 This is a schematic cross-sectional view of a display panel provided by an embodiment of the present invention. The display panel includes a substrate 1, a sub-pixel 2, a fingerprint sensor 3 and a reflective portion 4.

[0034] like Figure 1 As shown, the display panel includes a fingerprint recognition area A1. When a user needs to unlock the display panel or perform other authority verification, the user can press a finger on the fingerprint recognition area A1 of the display panel.

[0035] Illustratively, the embodiment of the present invention can make the shape and area of ​​the fingerprint sensor 3 and the fingerprint recognition area A1 consistent, that is, make the orthographic projection of the fingerprint sensor 3 on the plane where the display panel is located coincide with the fingerprint recognition area A1. Alternatively, the embodiment of the present invention can also make the shape of the fingerprint sensor 3 and the fingerprint recognition area A1 inconsistent. For example, the embodiment of the present invention can make the area of ​​the fingerprint recognition area A1 slightly larger than the area of ​​the fingerprint sensor 3, and make the boundary of the fingerprint sensor 3 located within the boundary of the fingerprint sensor area A1. Alternatively, the embodiment of the present invention can make the area of ​​the fingerprint recognition area A1 slightly smaller than the area of ​​the fingerprint sensor 3, and make the boundary of the fingerprint sensor area A1 located within the boundary of the fingerprint sensor 3. For example, Figure 1 As shown, in the embodiment of the present invention, the shape of the fingerprint recognition area A1 can be approximately elliptical, the shape of the orthographic projection of the fingerprint sensor 3 on the plane where the display panel is located can be approximately quadrilateral, and the orthographic projection of the fingerprint sensor 3 on the plane where the display panel is located can cover the fingerprint recognition area A1.

[0036] like Figure 2 As shown, the sub-pixel 2 is located on one side of the substrate 1. The fingerprint sensor 3 is located on the side of the substrate 1 away from the light-emitting side of the display panel. Figure 2 The middle arrow direction z represents the light emitting direction of the display panel. Along the direction perpendicular to the plane where the substrate 1 is located, the reflective portion 4 is located between the fingerprint sensor 3 and the sub-pixel 2. Figure 2 In the orientation shown, the fingerprint sensor 3 can be located in a partial area or the entire area below the substrate 1, forming an under-screen fingerprint system. Since fingerprint recognition can be implemented within the screen, the display panel provided by the embodiment of the present invention does not need to reserve space on its light-emitting side for a fingerprint button. The display area of ​​the display panel can be substantially extended to the entire light-emitting surface of the display panel, that is, a full-screen display is achieved.

[0037] In the embodiment of the present invention, the sub-pixel 2 can be used as a fingerprint recognition light source. When the user needs to unlock the display panel or perform other authority verification, such as Figure 2 As shown, a user can press finger 10 against fingerprint recognition area A1 of the display panel. Light emitted by subpixel 2 is directed toward finger 10, which is located on the light-emitting side of the display panel. This light is reflected from the surface of finger 10 to form fingerprint reflected light. Because the reflected light generated by the valleys and ridges of a fingerprint has different intensities, the fingerprint reflected light reflected from the surface of finger 10 carries information about both the valleys and ridges of the fingerprint.

[0038] It should be noted that, in the embodiment of the present invention, the sub-pixel 2 used as a fingerprint recognition light source can be located either inside or outside the fingerprint recognition area A1, as long as the light emitted by the sub-pixel 2 can be reflected by the finger 10, it can serve as a fingerprint recognition light source. Figure 2 The two sub-pixels 2 corresponding to the two light paths shown in the figure can both be used as fingerprint recognition light sources.

[0039] In the embodiment of the present invention, the reflective portion 4 can reflect the light reflected by the finger 10 again, and the light reflected by the reflective portion 4 can enter the fingerprint sensor 3. That is, the reflective portion 4 can enhance the light intensity entering the fingerprint sensor 3. Figure 2 As shown, if the reflector 4 is not provided, the portion of light that propagates in the first direction h1 after being reflected by the finger 10 will strike an area of ​​the display panel where the fingerprint sensor 3 is not located and will not be utilized by the fingerprint sensor 3. With the reflector 4 provided, this portion of light can be reflected by the reflector 4. The reflected light generated by the reflector 4 will propagate in the second direction h2 and illuminate the fingerprint sensor 3. Based on the intensity of the received reflected light, the fingerprint sensor 3 can determine the valleys and ridges of the fingerprint, thereby realizing fingerprint recognition and ensuring safe use of the display panel.

[0040] It can be seen that the embodiment of the present invention, by providing a reflective portion 4 in the display panel and re-reflecting part of the fingerprint reflected light, can adjust the propagation direction of the light that originally could not be used by the fingerprint sensor 3 so that it enters the fingerprint sensor 3, thereby enhancing the light intensity entering the fingerprint sensor 3 and improving the sensitivity of fingerprint recognition.

[0041] Furthermore, the embodiment of the present invention multiplexes sub-pixels as the light source required for the operation of the fingerprint sensor 3, eliminating the need for an additional fingerprint recognition light source in the display panel, thereby simplifying the structure of the display panel.

[0042] Furthermore, by positioning reflective portion 4 between fingerprint sensor 3 and sub-pixel 2 in a direction perpendicular to the plane of substrate 1, this embodiment of the present invention prevents reflective portion 4 from interfering with the normal light emission of sub-pixel 2. When the display panel is used for fingerprint recognition, this arrangement ensures that the light emitted by sub-pixel 2 is not affected by reflective portion 4 on its way to finger 10. Furthermore, when the display panel is displaying, the arrangement of this embodiment of the present invention ensures normal light emission from sub-pixel 2, which helps ensure a normal display effect of the display panel.

[0043] For example, Figure 2As shown, the display panel further includes foam 31, which is located on the same side of the substrate 1 as the fingerprint sensor 3. The foam 31 protects the display panel. When the display panel is impacted by external force, the foam 31 absorbs the stress and prevents the stress from being transferred to the display panel.

[0044] For example, in an embodiment of the present invention, a through hole can be opened in the foam 31 and the fingerprint sensor 3 can be placed in the through hole. That is, the fingerprint sensor 3 and the foam 31 are at least partially overlapped along a direction parallel to the plane where the display panel is located.

[0045] Illustratively, in an embodiment of the present invention, one or more of the above-mentioned reflective parts 4 may be provided in the display panel. Figure 1 This is a schematic diagram of providing four reflective portions 4 in the display panel.

[0046] like Figure 1 As shown, the orthographic projection of the fingerprint sensor 3 on the plane of the substrate 1 is the first projection 30; the orthographic projection of the reflective portion 4 on the plane of the substrate 1 is the second projection 400. For any reflective portion 4 in the display panel, the distance D1 between the second projection 400 corresponding to the reflective portion 4 and the edge of the first projection 30 is less than the distance D2 between the second projection 400 corresponding to the reflective portion 4 and the center O of the first projection 30. The distance D1 between the second projection 400 and the edge of the first projection 30 is the shortest distance between the center of the second projection 400 and the edge of the first projection 30, and the distance D2 between the second projection 400 and the center O of the first projection 30 is the distance between the center of the second projection 400 and the center O of the first projection 30. In other words, in this embodiment of the present invention, the reflective portion 4 is positioned near the edge of the fingerprint sensor 3.

[0047] Combine Figure 2 It can be seen that, compared to fingerprint reflected light whose propagation area passes near the center of fingerprint sensor 3, fingerprint reflected light formed by reflection from finger 10 is more likely to reach areas of the display panel where fingerprint sensor 3 is not located. Therefore, by locating reflective portion 4 near the edge of fingerprint sensor 3 in this embodiment of the present invention, the majority of fingerprint reflected light reflected by reflective portion 4 will be light whose propagation area passes near the edge of fingerprint sensor 3. This significantly improves the utilization rate of fingerprint reflected light and enhances fingerprint recognition sensitivity.

[0048] For example, Figure 2 As shown, the sub-pixel 2 includes a light emitting unit 21 and a pixel driving circuit 22, which are electrically connected to each other. The light emitting unit 21 is located on a side of the pixel driving circuit 22 close to the light emitting side of the display panel.

[0049] In the embodiment of the present invention, the light emitting unit 21 may include any one of an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), and a micro light emitting diode (Micro-LED). Figure 2 As shown, the light emitting unit 21 includes a first electrode 211, a second electrode 212 and a light emitting layer 210 which are stacked. The light emitting layer 210 is located between the first electrode 211 and the second electrode 212.

[0050] The pixel driving circuit 22 includes a plurality of thin film transistors 20. The number of the thin film transistors 20 can be adjusted according to different design requirements, which is not limited in the embodiment of the present invention. Figure 2 In the figure, only one thin film transistor 20 electrically connected to the light emitting unit 21 is used as an example. It should be noted that the pixel driving circuit 22 may also include one or more storage capacitors. Figure 2 The storage capacitor is not shown.

[0051] In the embodiment of the present invention, Figure 2 As shown, the fingerprint recognition area A1 includes a pixel area PA and a transmission area TA. The pixel area PA includes the above-mentioned light emitting unit 21 or pixel driving circuit 22. The light transmittance of the transmission area TA is greater than the light transmittance of the pixel area PA.

[0052] When setting the reflective portion 4, along a direction perpendicular to the plane of the substrate 1, the embodiment of the present invention can make at least a portion of the reflective portion 4 located in the above-mentioned pixel area PA, that is, make the reflective portion 4 at least partially overlap with the light-emitting unit 21; or, the reflective portion 4 at least partially overlap with the pixel driving circuit 22. Figure 2 It is a schematic diagram showing that the reflective portion 4 and the light emitting unit 21 overlap in a direction perpendicular to the plane where the substrate 1 is located.

[0053] The fingerprint reflected light needs to pass through multiple film layers in the display panel when it is emitted from the finger 10 to the fingerprint sensor 3. The light transmittance of the pixel area PA where the light emitting unit 21 and the pixel driving circuit 22 are located is relatively low. Figure 2As shown, taking fingerprint reflected light propagating along the third direction h3 as an example, this portion of fingerprint reflected light can pass through the gap between two adjacent light-emitting units 21 and the gap between the pixel driving circuits 22 connected to the two adjacent light-emitting units 21, and then be emitted toward the fingerprint sensor 3. That is, this portion of fingerprint reflected light can be emitted toward the fingerprint sensor 3 through the transmission area TA, with minimal light loss during its propagation. In this embodiment of the present invention, by aligning the reflective portion 4 with the light-emitting units 21 or the pixel driving circuit 22, i.e., by locating at least a portion of the reflective portion 4 in the pixel area PA, the area of ​​the reflective portion 4 located in the transmission area TA can be reduced, while maintaining a certain area of ​​the reflective portion 4. This minimizes the amount of fingerprint reflected light that would otherwise propagate through the transmission area TA from being reflected by the reflective portion 4, ensuring that this portion of fingerprint reflected light can be emitted directly toward the fingerprint sensor 3. In other words, the approach provided by this embodiment of the present invention ensures that the reflective portion 4 reflects high-angle light directed toward the edge of the fingerprint sensor 3 and that it enters the fingerprint sensor 3, while also ensuring that the fingerprint reflected light that would otherwise propagate through the transmission area TA is not affected.

[0054] The embodiments of the present invention provide multiple implementations of the reflector 4, which are described below:

[0055] like Figure 2 As shown, in embodiments of the present invention, the reflective portion 4 can be configured as a single, integrated structure, wherein the reflective surface 40 of the reflective portion 4 forms a non-zero angle with the plane of the display panel, that is, the reflective surface 40 is not parallel to the plane of the display panel. Based on this configuration, when the reflective portion 4 is positioned between the fingerprint sensor 3 and the finger 10 in a direction perpendicular to the plane of the display panel, the intensity of the fingerprint reflected light reflected by the reflective surface 40 and entering the fingerprint sensor 3 can be increased, which is beneficial for improving fingerprint recognition sensitivity.

[0056] Or, as Figure 3 As shown, Figure 3 This is a cross-sectional diagram of another display panel provided by an embodiment of the present invention. In this embodiment of the present invention, the reflective portion 4 can also be configured to include a first reflective portion 41 and a second reflective portion 42. In addition, along a direction parallel to the plane where the substrate 1 is located, the second reflective portion 42 is located on the side of the first reflective portion 41 close to the fingerprint sensor 3; along a direction perpendicular to the plane where the display panel is located, the second reflective portion 42 is located on the side of the first reflective portion 41 close to the light-emitting side of the display panel. Figure 3As shown, if there is fingerprint reflected light that is reflected by the first reflecting part 41 and propagates toward the light-emitting side of the display panel, for this part of the light, the embodiment of the present invention arranges the above-mentioned first reflecting part 41 and the second reflecting part 42 according to the above-mentioned positional relationship, so that the second reflecting part 42 can be located on the propagation path of this part of the light, that is, the second reflecting part 42 can reflect this part of the light again, and this part of the light can enter the fingerprint sensor 3 after being reflected by the second reflecting part 42, thereby further increasing the light intensity entering the fingerprint sensor 3 and improving the fingerprint recognition sensitivity.

[0057] For example, Figure 4 and Figure 5 As shown, Figure 4 A cross-sectional schematic diagram of another display panel provided by an embodiment of the present invention is shown. Figure 5 for Figure 4 The enlarged schematic diagram of the first reflecting part, the second reflecting part, the fingerprint sensor and the finger, the first reflecting part 41 includes a first reflecting surface 411 and a second reflecting surface 412, the first reflecting surface 411 is located on the side of the second reflecting surface 412 close to the light emitting side of the display panel; along the direction parallel to the plane where the substrate 1 is located, the second reflecting surface 412 is located on the side of the first reflecting surface 411 close to the second reflecting part 42. Exemplarily, in an embodiment of the present invention, there is a non-zero angle between the first reflecting surface 411 and the plane where the display panel is located. There is a non-zero angle between the first reflecting surface 411 and the second reflecting surface 412. Exemplarily, the angle between the first reflecting surface 411 and the second reflecting surface 412 is greater than or equal to 90°. As Figure 4 and Figure 5 It is a schematic diagram showing that the first reflective surface 411 is perpendicular to the plane where the display panel is located, and the second reflective surface 412 is parallel to the plane where the display panel is located.

[0058] like Figure 5 As shown, if the fingerprint reflected light propagates along the fourth direction h4 after being reflected by the first reflective surface 411, this portion of light will not be received by the fingerprint sensor 3. By providing a second reflective surface 412 and arranging the second reflective surface 412 and the first reflective surface 411 according to the aforementioned positional relationship, this embodiment of the present invention can further reflect the light reflected by the first reflective surface 411, allowing the reflected light to enter the fingerprint sensor 3 through reflection from the second reflective portion 42. It can be seen that the combination of the first reflective surface 411, the second reflective surface 412, and the second reflective portion 42 can focus the originally divergent fingerprint reflected light into the fingerprint sensor 3 through multiple reflections, ensuring that the majority of the fingerprint reflected light can enter the fingerprint sensor 3, which is beneficial for further improving the sensitivity of fingerprint recognition.

[0059] For example, Figure 5As shown, the first reflective portion 41 includes a first metal layer 51 and a second metal layer 52 stacked together, the first metal layer 51 being located on the second metal layer 52 away from the substrate ( Figure 5 The area of ​​the first metal layer 51 is smaller than the area of ​​the second metal layer 52. Figure 5 As shown, the side surface 510 of the first metal layer 51 forms the first reflective surface 411. The side surface of the first metal layer 51 is the surface intersecting with the plane of the substrate. The second metal layer 52 includes a first sub-metal layer 521 and a second sub-metal layer 522. In the direction perpendicular to the plane of the display panel, the first sub-metal layer 521 does not overlap with the first metal layer 51. The surface 520 of the first sub-metal layer 521 away from the substrate forms the second reflective surface 412. Figure 5 As shown, the first metal layer 51 contacts the second sub-metal layer 522 , and the first metal layer 51 covers the second sub-metal layer 522 .

[0060] For example, when manufacturing the first reflective portion 41, embodiments of the present invention may form the first metal layer 51 and the second metal layer 52 in stages. Alternatively, embodiments of the present invention may first form a metal layer having a relatively large thickness, and then etch the surface of the metal layer to remove material at portions corresponding to the first sub-metal layer 521, thereby forming the first reflective portion 41 having the first reflective surface 411 and the second reflective surface 412.

[0061] For example, Figure 6 As shown, Figure 6 This is a cross-sectional schematic diagram of another first reflective portion provided by an embodiment of the present invention. The first reflective portion 41 includes a plurality of first metal layers 51, and there is a distance between two adjacent first metal layers 51. Figure 6 As shown, the gap between two adjacent first metal layers 51 corresponds to the first sub-metal layer 521. Any surface of the first sub-metal layer 521 between any two adjacent first metal layers 51 can serve as the second reflective surface 412. This arrangement increases the total area of ​​the second reflective surface 412, facilitating the adjustment of more high-angle light directed toward the edge of the fingerprint sensor 3, allowing more high-angle light to enter the fingerprint sensor 3 and improving fingerprint recognition sensitivity.

[0062] It should be noted that Figure 6 The cross-sectional shape of the first reflective portion 41 shown is only for illustration purposes, and the cross-sectional shape of the first reflective portion 41 may be set to other shapes in the embodiment of the present invention. Figure 7 and Figure 8 As shown, Figure 7 and Figure 8, respectively, are cross-sectional schematic diagrams of two other first reflective portions provided in embodiments of the present invention. In embodiments of the present invention, the cross-sectional shape of the first metal layer 51 can be set to a trapezoidal shape ( Figure 7 shown) or triangle ( Figure 8 shown).

[0063] like Figure 9 As shown, Figure 9 A cross-sectional schematic diagram of another display panel provided in an embodiment of the present invention, wherein the thin film transistor 20 in the pixel driving circuit 22 includes an active layer 220. The display panel further includes a light shielding portion 6, which is located on a side of the active layer 220 close to the light emitting side of the display panel in a direction perpendicular to the plane of the substrate 1, and the light shielding portion 6 at least partially overlaps with the active layer 220. The light shielding portion 6 can prevent the light reflected from the fingerprint from irradiating the active layer 200, thereby preventing the light from affecting the characteristics of the thin film transistor 20. While the embodiment of the present invention adopts the reflective portion 4 to improve the sensitivity of the fingerprint sensor, it can also ensure that the display performance of the display panel is not affected by providing the light shielding portion 6 in the display panel.

[0064] For example, in the embodiment of the present invention, the surface of the light shielding portion 6 away from the active layer 220 is a reflective surface. That is, the fingerprint reflected light will be reflected after it strikes the active layer 220 .

[0065] like Figure 9 As shown, the thin film transistor 20 includes a first electrode 221, a second electrode 222, and a control electrode 223. The control electrode 223 is the gate of the thin film transistor 20. One of the first electrode 221 and the second electrode 222 is the source of the thin film transistor 20, and the other is the drain of the thin film transistor 20.

[0066] An insulating layer 7 is provided between the first electrode 221 and the active layer 220. The insulating layer 7 includes a first through-hole 70 filled with a first conductive portion 81. The first electrode 221 is electrically connected to the active layer 220 via the first conductive portion 81. The side surface of the first conductive portion 81 is a reflective surface, and the side surface of the first conductive portion 81 intersects the plane of the substrate 1.

[0067] like Figure 9 As shown, the display panel further includes a third reflective portion 43; the third reflective portion 43 is located on the side of the light shielding portion 6 away from the substrate 1; along the direction parallel to the plane where the substrate 1 is located, the third reflective portion 43 and the light shielding portion 6 are located on the same side of the first conductive portion 81. Figure 9 Taking the position shown in FIG. 1 as an example, the third reflective portion 43 and the light shielding portion 6 are both located on the left side of the first conductive portion 81. Figure 9As shown, part of the fingerprint reflected light propagating along the fifth direction h5 hits the light shielding portion 6. After being reflected by the light shielding portion 6, the reflected light hits the side of the first conductive portion 81. The first conductive portion 81 is metal and has a reflective effect on light. Therefore, the first conductive portion 81 continues to reflect the light, and the reflected light hits the third reflective portion 43, which can then continue to reflect the light to the fingerprint sensor 3. It can be seen that the embodiment of the present invention, while providing the light shielding portion 6 to ensure that the performance of the thin film transistor 20 is not affected, can also allow the fingerprint reflected light originally irradiated by the light shielding portion 6 to be utilized by the fingerprint sensor 3, avoiding the waste of this part of the fingerprint reflected light. This arrangement further increases the light intensity entering the fingerprint sensor 3 and improves the sensitivity of fingerprint recognition.

[0068] It should be noted that the above-mentioned insulating layer 7 may be a single-layer structure or a multi-layer structure including a plurality of stacked sub-layers. Figure 9 As shown, the insulating layer 7 may include a first sub-insulating layer 71, a second sub-insulating layer 72, and a third sub-insulating layer 73, which are stacked. The first sub-insulating layer 71 is located on the side of the active layer 220 away from the substrate 1. The second sub-insulating layer 72 is located on the side of the control electrode 223 away from the substrate 1 and can serve as a gate insulating layer. The third sub-insulating layer 73 is located on the side of the second sub-insulating layer 72 away from the substrate 1. The first through hole 70 penetrates the first sub-insulating layer 71, the second sub-insulating layer 72, and the third sub-insulating layer 73.

[0069] For example, the light shielding portion 6 may be formed of a metal material.

[0070] Optionally, in an embodiment of the present invention, the second reflecting portion 42 and the third reflecting portion 43 may be provided in the same layer. Exemplarily, when providing the above-mentioned first reflecting portion 41, the second reflecting portion 42 and the third reflecting portion 43, the embodiment of the present invention may provide the first reflecting portion 41 and the gate electrode of the thin film transistor 20 in the same layer; and / or, provide the second reflecting portion 42 and the source electrode of the thin film transistor 20 in the same layer; and / or, provide the third reflecting portion 43 and the source electrode of the thin film transistor 20 in the same layer. The structures provided in the same layer may be formed by the same process, so as to improve the light intensity received by the fingerprint sensor 3 while avoiding increasing the manufacturing process of the display panel and simplifying the manufacturing process of the display panel. Figure 3 、 Figure 4 and Figure 9 It is a schematic diagram showing that the first reflective portion 41 and the gate electrode of the thin film transistor 20 are arranged on the same layer, and the second reflective portion 42 and the source electrode of the thin film transistor 20 are arranged on the same layer.

[0071] For example, Figure 10 As shown, Figure 10This is a cross-sectional schematic diagram of another display panel provided by an embodiment of the present invention. The display panel further includes a pixel definition layer 9 . The pixel definition layer 9 includes a plurality of openings 90 . At least part of the light emitting units 21 are located in the openings 90 .

[0072] In the embodiment of the present invention, the transmission area TA can be arranged in a variety of ways, which are described below respectively:

[0073] like Figure 10 As shown, the pixel definition layer 9 includes a first side surface 91, and the first side surface 91 is located in the transmission area TA. Specifically, the first side surface 91 is located between two adjacent openings 90 in the pixel definition layer 9. The first side surface 91 intersects with the plane where the display panel is located.

[0074] like Figure 10 As shown, the display panel further includes a fourth reflective portion 44, which is located on a side of the first side surface 91 close to the light-emitting side of the display panel. The fourth reflective portion 44 can reflect fingerprint reflected light directed toward the pixel area PA of the display panel located on one side of the fourth reflective portion 44.

[0075] If the fourth reflecting portion 44 is not provided, Figure 10 As shown, the fingerprint reflected light propagating along the sixth direction h6 will be emitted toward the pixel area PA adjacent to the fourth reflective portion 44. Due to the low light transmittance of the pixel area PA, this portion of light will suffer significant loss during its propagation toward the fingerprint sensor 3. By providing the fourth reflective portion 44, the embodiment of the present invention can reflect this portion of light, allowing the light reflected by the fourth reflective portion 44 to sequentially pass through the first reflective portion 41 and the second reflective portion 42 before being emitted toward the fingerprint sensor 3. This reduces the loss of the fingerprint reflected light during its propagation toward the fingerprint sensor 3, increases the light intensity received by the fingerprint sensor 3, and further enhances the fingerprint recognition sensitivity.

[0076] Exemplarily, the fourth reflecting portion 44 and the second reflecting portion 42 are located on the same side of the first reflecting portion 41, so that the light reflected by the fourth reflecting portion 44 can be directed to the first reflecting portion 41, and the light reflected by the first reflecting portion 41 can be directed to the second reflecting portion 42. Figure 10 Taking the illustrated orientation as an example, the fourth reflecting portion 44 and the second reflecting portion 42 are both located on the right side of the first reflecting portion 41 .

[0077] It should be noted that, similar to the above-mentioned arrangement of the reflecting portion 4 including the first reflecting portion 41 and the second reflecting portion 42, the embodiment of the present invention can also arrange the fourth reflecting portion 44 close to the edge of the fingerprint sensor 3 so that the fourth reflecting portion 44 adjusts the large-angle fingerprint reflected light originally directed to the pixel area PA.

[0078] like Figure 10As shown, the pixel definition layer 9 further includes a second side surface 92. The second side surface 92 and the adjacent first side surface 91 are located between two adjacent openings 90. The second side surface 92 intersects with the plane where the display panel is located.

[0079] Optional, such as Figure 10 As shown, a light-transmitting layer 93 is included between the first side surface 91 and the second side surface 92. The light transmittance of the light-transmitting layer 93 is greater than the light transmittance of the pixel definition layer 9. Figure 10 As shown, the light-transmitting layer 93 may be located in the transmission area TA. For example, the light-transmitting layer 93 may be air. Alternatively, it may be another insulating film layer having a greater light transmittance than the pixel definition layer 9.

[0080] like Figure 10 As shown, the display panel further includes a fifth reflective portion 45, which is located on the second side surface 92 near the light-emitting side of the display panel. The fifth reflective portion 45 can reflect fingerprint-reflected light directed toward the pixel area PA adjacent to the fifth reflective portion 45, directing this light toward the fingerprint sensor 23 through the transmissive area TA. This reduces light loss on the way to the fingerprint sensor 3, increases the light intensity received by the fingerprint sensor 3, and improves fingerprint recognition sensitivity.

[0081] For example, Figure 10 As shown, the pixel definition layer 9 includes a bottom surface 95 , which is parallel to the plane where the substrate 1 is located, and intersects with the first side surface 91 .

[0082] For example, the angle between the first side surface 91 and the bottom surface 95 is equal to the angle between the second side surface 92 and the bottom surface 95. When manufacturing the pixel definition layer 9, after forming the entire layer structure covering the substrate 1, embodiments of the present invention can use the same patterning process to open two types of through holes in the entire pixel definition layer structure, wherein the first type of through hole is the aforementioned opening 90, and the second type of through hole corresponds to the area where the fourth reflective portion 44, the fifth reflective portion 45, and the light-transmitting layer 93 are formed. The first side surface 91 and the second side surface 92 can be considered as the sidewalls of the second type of through hole.

[0083] In the embodiment of the present invention, the angle θ between the bottom surface 95 of the pixel definition layer 9 and the first side surface 91 satisfies: 60°≤θ<90°.

[0084] In the embodiment of the present invention, by setting θ to be less than 90°, the fourth reflective portion 44 formed above the first side surface 91 can better receive the fingerprint reflected light.

[0085] like Figure 11 As shown, Figure 11FIG1 is a schematic diagram of the optical path of the fingerprint reflected light passing through the fourth reflector, where α is defined as the maximum angle between the effective fingerprint reflected light incident on the fourth reflector 44 and the plane where the fourth reflector 44 is located. Here, the effective fingerprint reflected light refers to the fingerprint reflected light that can be reflected by the fourth reflector 44 and can be emitted through the area between the fourth reflector 44 and the fifth reflector 45. Figure 11 As shown, the fingerprint reflected light corresponding to α propagates along the seventh direction h7. If the propagation direction of the fingerprint reflected light incident on the fourth reflective portion 44 changes, for example, if the angle between the fingerprint reflected light incident on the fourth reflective portion 44 and the plane in which the fourth reflective portion 44 is located is greater than α, the light reflected by the fourth reflective portion 44 will illuminate the fifth reflective portion 45 and reflect toward the light-emitting side of the display panel, causing this portion of the fingerprint reflected light to be unable to be received by the fingerprint sensor 3 located on the backlight side of the display panel. In other words, if the angle between the fingerprint reflected light incident on the fourth reflective portion 44 and the plane in which the fourth reflective portion 44 is located is greater than α, this portion of the fingerprint reflected light will become invalid fingerprint reflected light.

[0086] based on Figure 11 The structure shown in the figure can be obtained according to the trigonometric function relationship: Wherein, h is the thickness of the pixel definition layer 9 at a location where the opening 90 is not provided, wherein the thickness direction of the pixel definition layer 9 is perpendicular to the plane of the display panel. l is the length of the orthographic projection of the first side surface 91 on the plane of the display panel. The length of the orthographic projection of the second side surface 92 on the plane of the display panel may also be l.

[0087] again Wherein, η is the angle between the propagation direction of the fingerprint reflected light reflected by the fourth reflective portion 44 and the plane where the display panel is located; d is the shortest distance between the first side surface 91 and the second side surface 92.

[0088] according to Figure 11 It can be seen that η=90°-σ=90°-(β+α), where β=90°-θ.

[0089] Arranged available,

[0090] The above derivation shows that α and θ are positively correlated. Therefore, by setting θ to be greater than or equal to 60°, the embodiment of the present invention can also make α relatively large, ensuring that more fingerprint reflected light becomes effective fingerprint reflected light. In other words, more fingerprint reflected light is reflected by the fifth reflector 45, emitted through the area between the fourth reflector 44 and the fifth reflector 45, and received by the fingerprint sensor 3. This arrangement helps increase the light intensity received by the fingerprint sensor 3. Furthermore, the area between the fourth reflector 44 and the fifth reflector 45 has a high light transmittance, which also ensures that the fingerprint reflected light has minimal loss during its propagation to the fingerprint sensor 3.

[0091] like Figure 12 As shown, Figure 12 This is a cross-sectional schematic diagram of another display panel provided in an embodiment of the present invention. The pixel definition layer 9 further includes a plurality of pinholes 94 located in the transmissive area TA between two adjacent light-emitting units 21. In this embodiment of the present invention, the diameter of the pinholes 94 is less than or equal to 800 nm, so that light diffracts when passing through the pinholes 94 in the transmissive area TA. The diffracted light emitted through the pinholes 94 reaches the reflective portion 4 and is reflected by the reflective portion 4 into the fingerprint sensor 3. This improves the amount of light incident on the fingerprint sensor while also preventing interference with the display in the pixel area PA, ensuring the display quality of the display panel.

[0092] The embodiment of the present invention further provides a display device, such as Figure 13 As shown, Figure 13 Schematic diagram of a display device provided by an embodiment of the present invention, the display device includes the above-mentioned display panel 100. The specific parts of the display panel 100 have been described in detail in the above embodiments and will not be repeated here. Figure 13 The display device shown is for illustrative purposes only. The display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a laptop computer, an e-reader, or a television.

[0093] The embodiment of the present invention provides a reflective portion in the display panel, which re-reflects part of the fingerprint reflected light, thereby adjusting the propagation direction of light that originally could not be used by the fingerprint sensor so that it enters the fingerprint sensor, thereby increasing the light intensity entering the fingerprint sensor and improving the sensitivity of fingerprint recognition.

[0094] Furthermore, the embodiment of the present invention multiplexes sub-pixels as the light source required for the operation of the fingerprint sensor, eliminating the need for an additional fingerprint recognition light source in the display panel, thereby simplifying the structure of the display panel.

[0095] In addition, by positioning the reflective portion between the fingerprint sensor and the sub-pixel in a direction perpendicular to the substrate plane, the embodiment of the present invention can prevent the reflective portion from affecting the normal light emission of the sub-pixel. When the display panel is used for fingerprint recognition, this arrangement ensures that the light emitted by the sub-pixel is not affected by the reflective portion during its journey to the finger. Furthermore, when the display panel is displaying, the arrangement of the embodiment of the present invention can ensure that the sub-pixel emits light normally, which helps to ensure the normal display effect of the display panel.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; a sub-pixel located on one side of the substrate; a fingerprint sensor, located on a side of the substrate away from the light-emitting side of the display panel; a reflective portion, located between the fingerprint sensor and the sub-pixel in a direction perpendicular to the plane of the substrate; the reflective portion is used to enhance the intensity of light entering the fingerprint sensor; The sub-pixel includes a pixel driving circuit, and the pixel driving circuit includes a thin film transistor; The display panel further includes a light shielding portion; The surface of the light shielding portion away from the active layer of the thin film transistor is a reflective surface; The thin film transistor includes a control electrode, a first electrode and a second electrode; An insulating layer is included between the first electrode and the active layer, the insulating layer includes a first through hole, and the first through hole is filled with a first conductive portion; the first electrode is electrically connected to the active layer through the first conductive portion; The side surface of the first conductive portion is a reflective surface; The side surface of the first conductive portion intersects with the plane where the substrate is located; The display panel further includes a third reflective portion; the third reflective portion is located on a side of the light shielding portion away from the substrate; Along a direction parallel to the plane where the substrate is located, the third reflective portion and the light shielding portion are located on the same side of the first conductive portion.

2. The display panel according to claim 1, wherein: The orthographic projection of the fingerprint sensor on the plane where the substrate is located is a first projection; The orthographic projection of the reflecting portion on the plane where the substrate is located is a second projection; The distance between the second projection and the edge of the first projection is D1, The distance between the center of the second projection and the center of the first projection is D2, and D1<D2.

3. The display panel according to claim 1, wherein: The sub-pixel includes a light-emitting unit, and the light-emitting unit and the pixel driving circuit are electrically connected to each other; along a direction perpendicular to the plane where the substrate is located, the reflective portion at least partially overlaps with the light-emitting unit; or, the reflective portion at least partially overlaps with the pixel driving circuit.

4. The display panel according to claim 1, wherein: The reflecting portion includes a first reflecting portion and a second reflecting portion. In a direction parallel to the plane where the substrate is located, the second reflecting portion is located on a side of the first reflecting portion close to the fingerprint sensor. In a direction perpendicular to the plane where the display panel is located, the second reflecting portion is located on a side of the first reflecting portion close to the light emitting side of the display panel.

5. The display panel according to claim 4, wherein: The first reflective portion includes a first reflective surface and a second reflective surface, the first reflective surface is located on a side of the second reflective surface close to the light emitting side of the display panel; along a direction parallel to the plane where the substrate is located, the second reflective surface is located on a side of the first reflective surface close to the second reflective portion; An included angle is formed between the first reflecting surface and the second reflecting surface.

6. The display panel according to claim 5, wherein: The first reflective portion includes a first metal layer and a second metal layer stacked together, the first metal layer being located on a side of the second metal layer away from the substrate; an area of ​​the first metal layer is smaller than an area of ​​the second metal layer; The side surface of the first metal layer forms the first reflective surface, and the side surface of the first metal layer intersects with the plane where the substrate is located; The second metal layer includes a first sub-metal layer. Along a direction perpendicular to the plane where the display panel is located, the first sub-metal layer does not overlap with the first metal layer. The surface of the first sub-metal layer away from the substrate forms the second reflective surface.

7. The display panel according to claim 6, wherein: The first reflective portion includes a plurality of first metal layers, and a distance exists between two adjacent first metal layers.

8. The display panel according to claim 7, wherein: Along a direction perpendicular to the plane of the substrate, the light shielding portion is located on a side of the active layer of the thin film transistor close to the light emitting side of the display panel, and the light shielding portion at least partially overlaps the active layer of the thin film transistor.

9. The display panel according to claim 4, wherein: The sub-pixel includes a light-emitting unit, and the pixel driving circuit is electrically connected to the light-emitting unit; the first reflective portion and the gate of the thin film transistor are arranged on the same layer; and / or the second reflective portion and the source of the thin film transistor are arranged on the same layer.

10. The display panel according to claim 1, wherein The sub-pixel includes a light-emitting unit; The display panel further includes a pixel definition layer, the pixel definition layer includes a plurality of openings, and at least part of the light emitting units are located in the openings; The pixel definition layer further includes a first side surface, which is located between two adjacent openings; the display panel further includes a fourth reflective portion, which is located on a side of the first side surface close to the light emitting side of the display panel.

11. The display panel according to claim 10, wherein: The pixel definition layer includes a bottom surface, the bottom surface is parallel to the plane where the substrate is located, the bottom surface intersects with the first side surface, and an angle θ between the bottom surface and the first side surface satisfies: 60°≤θ<90°.

12. The display panel according to claim 1, wherein The sub-pixel includes a light-emitting unit; the display panel further includes a pixel definition layer, the pixel definition layer includes a plurality of openings, and at least part of the light-emitting units are located in the openings; The pixel definition layer further includes a plurality of pinholes, each of which is located between two adjacent light-emitting units; and the diameter of each pinhole is less than or equal to 800 nm.

13. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 12.

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