Display panel and display device

Abstract

The present disclosure provides a display panel and a display device, including: a substrate; a plurality of light-emitting devices located on the substrate; a plurality of photosensitive devices located between the layer where the plurality of light-emitting devices are located and the substrate; the plurality of photosensitive devices are configured to collect the emitted light of the plurality of light-emitting devices reflected by a fingerprint; the orthographic projection of each photosensitive device on the substrate is located at a gap between the orthographic projections of each light-emitting device on the substrate; a light-shielding portion located on the light-incident side of the plurality of photosensitive devices, and the orthographic projection of the light-shielding portion on the substrate overlaps with the edge region of the orthographic projection of the photosensitive device; and the light-shielding portion has a first opening, and the orthographic projection of the first opening on the substrate overlaps with the middle region of the orthographic projection of the photosensitive device.

Description

Technical Field

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

[0002] With the continuous development of terminal technologies, electronic devices are more and more widely used. Due to the uniqueness of skin patterns such as fingerprint patterns or palmprint patterns, in order to protect the information security of users, the use of fingerprint recognition functions on electronic devices is becoming more and more common, such as for unlocking mobile phones, mobile payments (such as payments, transfers), etc. Summary of the Invention

[0003] On the one hand, an embodiment of the present disclosure provides a display panel, including:

[0004] A substrate;

[0005] A plurality of light-emitting devices located on the substrate;

[0006] A plurality of photosensitive devices located between the layer where the plurality of light-emitting devices are located and the substrate; the plurality of photosensitive devices are configured to collect the emitted light of the plurality of light-emitting devices reflected by a fingerprint; the orthographic projection of each photosensitive device on the substrate is located at a gap between the orthographic projections of each light-emitting device on the substrate;

[0007] A light-shielding portion located on the light-incident side of the plurality of photosensitive devices, the orthographic projection of the light-shielding portion on the substrate overlaps with the edge region of the orthographic projection of the photosensitive device; and the light-shielding portion has a first opening, and the orthographic projection of the first opening on the substrate overlaps with the middle region of the orthographic projection of the photosensitive device.

[0008] Optionally, in the above display panel provided by the embodiment of the present disclosure, the light-emitting device is a top-emitting type light-emitting device, including: an anode, a cathode located on a side of the anode away from the substrate, and a light-emitting functional layer located between the anode and the cathode;

[0009] The photosensitive device includes: a metal electrode and a transparent electrode disposed opposite to each other, and a photoelectric conversion layer located between the metal electrode and the transparent electrode, wherein the transparent electrode is located between the layer where the metal electrode is located and the layer where the anode is located;

[0010] The light-shielding portion is located between the layer where the transparent electrode is located and the light-emitting functional layer.

[0011] Optionally, in the above display panel provided by the embodiment of the present disclosure, the anode is multiplexed as the light-shielding portion.

[0012] Optionally, in the above display panel provided by the embodiments of the present disclosure, it further includes: a pixel defining layer located between the layer where the anode is located and the layer where the transparent electrode is located, and having a plurality of pixel openings;

[0013] The orthographic projection of the anode on the substrate completely covers the orthographic projection of the pixel opening, and the overlapping area of the orthographic projection of the anode with the edge area of the orthographic projection of the photosensitive device is located within the orthographic projection of the pixel defining layer.

[0014] Optionally, in the above display panel provided by the embodiments of the present disclosure, it further includes: a pixel defining layer located between the layer where the anode is located and the layer where the transparent electrode is located, and having a plurality of pixel openings;

[0015] The orthographic projection of the anode on the substrate completely covers the orthographic projection of the pixel opening, and a partial overlapping area of the orthographic projection of the anode with the edge area of the orthographic projection of the photosensitive device is located within the orthographic projection of the pixel opening.

[0016] Optionally, in the above display panel provided by the embodiments of the present disclosure, the light-emitting device is a bottom-emitting light-emitting device, including: an anode, a cathode located on a side of the anode facing the substrate, and a light-emitting functional layer located between the anode and the cathode;

[0017] The photosensitive device includes: a metal electrode and a transparent electrode facing each other, and a photoelectric conversion layer located between the transparent electrode and the metal electrode, wherein the metal electrode is located between the layer where the transparent electrode is located and the layer where the cathode is located;

[0018] The light-shielding portion is located between the layer where the transparent electrode is located and the substrate.

[0019] Optionally, in the above display panel provided by the embodiments of the present disclosure, it further includes: a plurality of top-gate transistors located between the substrate and the layer where the transparent electrode is located, and a light-shielding metal layer located between the layer where the plurality of top-gate transistors are located and the substrate; wherein the light-shielding metal layer is reused as the light-shielding portion.

[0020] Optionally, in the above display panel provided by the embodiments of the present disclosure, the orthographic projection of the light-shielding metal layer on the substrate completely coincides with the orthographic projection of the active layer and the edge area of the orthographic projection of the photosensitive device.

[0021] Optionally, in the above display panel provided by the embodiments of the present disclosure, the width of the overlapping area of the orthographic projection of the light-shielding portion on the substrate with the edge areas of the orthographic projections of a plurality of the photosensitive devices is the same.

[0022] Optionally, in the above display panel provided by the embodiments of the present disclosure, the width d of the edge region of the photosensitive device satisfies the following relational expression:

[0023] d = h * tanθ

[0024] wherein, h is the distance between the layer where the light-shielding portion is located and the layer where the plurality of photosensitive devices are located in a direction perpendicular to the substrate, and θ is the maximum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices.

[0025] Optionally, in the above display panel provided by the embodiments of the present disclosure, the width D of the photosensitive device satisfies the following relational expression:

[0026] D ≥ h * (tanθ + 2tanθc), or D = L + h * tanθ

[0027] wherein, h is the distance between the layer where the light-shielding portion is located and the layer where the plurality of photosensitive devices are located in a direction perpendicular to the substrate, θ is the maximum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices, θc is the minimum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices, and L is the width of the first opening.

[0028] Optionally, in the above display panel provided by the embodiments of the present disclosure, h is greater than or equal to 1 μm and less than or equal to 4 μm.

[0029] On the other hand, the embodiments of the present disclosure provide a display device, including the above display panel. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0031] Figure 2 is another schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0032] Figure 3 is another schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0033] Figure 4 is another schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0034] Figure 5 is another schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0035] Figure 6 is another schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0036] Figure 7Another structural schematic diagram of the display panel provided by the embodiments of the present disclosure;

[0037] Figure 8 Another structural schematic diagram of the display panel provided by the embodiments of the present disclosure;

[0038] Figure 9 Schematic diagram of the projection relationship between the light-shielding part and the photosensitive device in the display panel provided by the embodiments of the present disclosure;

[0039] Figure 10 Schematic diagram of the display panel provided by the embodiments of the present disclosure. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the various figures in the drawings do not reflect the actual scale, and the purpose is only to schematically illustrate the content of the present disclosure. Also, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second" and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms such as "inside", "outside", "above", "below", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] Currently, narrow bezels have gradually become the mainstream in the design and manufacturing of display devices, especially for portable display devices such as mobile phones. One of the means to achieve narrow bezels is to integrate a photosensitive device with fingerprint recognition function into the display device, implement the under-screen fingerprint recognition method, increase the area of the display area of the display device, and thus increase the screen-to-body ratio.

[0043] For example, a point light source, a line light source, or a light source with a certain pattern can be used as the photosensitive light source of the photosensitive device for fingerprint recognition. Moreover, there are various ways to arrange the light source and the photosensitive device. For example, the light source can be arranged on the side of the photosensitive device close to the fingerprint touch, or the light source and the photosensitive device can be arranged in the same plane, or the light source can also be arranged on the side of the photosensitive device far from the fingerprint touch. The arrangement of the light source and the photosensitive device can be selected according to different requirements.

[0044] As a current-driven light-emitting device, an Organic Light Emitting Diode (OLED) has the advantages of self-luminescence, fast response, wide viewing angle, and can be fabricated on flexible products, etc., and is widely used in the field of high-performance displays. Here, taking the OLED as the point light source of the photosensitive device, and the point light source is arranged on the side of the photosensitive device close to the fingerprint touch as an example, the fingerprint recognition principle will be introduced, but this does not limit the embodiments of the present disclosure.

[0045] During the fingerprint recognition process, when the light emitted by the OLED point light source irradiates the fingerprint pressing interface (such as the outer surface of the display screen) at different angles, due to the total reflection effect of the fingerprint pressing interface, the part of the light with an incident angle greater than or equal to the total reflection critical angle (generally, the total reflection critical angle between the display device and air is about 42°, and the maximum emission angle of the point light source is 70°), that is, the part between 42° and 70°, will undergo total reflection, resulting in this part of the light not being able to exit from the fingerprint pressing interface, thus generating a total reflection area. Correspondingly, the part of the light with an incident angle less than the total reflection critical angle of 42° exits from the fingerprint pressing interface. Therefore, the light reflected by the total reflection area can be used for collecting the texture image. In other words, when the user's finger presses the fingerprint on the total reflection area, the ridges of the fingerprint touch the surface of the total reflection area, so the total reflection condition at the position corresponding to the ridges of the fingerprint is destroyed, and thus the light will exit at this corresponding position, changing the original reflection path. While the valleys of the fingerprint do not touch the surface of the total reflection area, so the total reflection condition at the position corresponding to the valleys of the fingerprint is not destroyed, and thus the light will still be totally reflected at this corresponding position, keeping the original reflection path unchanged. In this way, due to the different effects of the valleys and ridges of the fingerprint on the total reflection condition, the light incident on the fingerprint imaging interface forms a light and dark alternating texture image at different positions.

[0046] However, during the fingerprint recognition process, in addition to the light emitted by the OLED point light source being sensed by the photosensitive device, the photosensitive device may also sense ambient light incident through means such as fingers. Since the photosensitive device receives light passively and does not actively distinguish the light emitted by the OLED point light source from the ambient light, the ambient light may interfere with the fingerprint recognition of the photosensitive device, resulting in blurred or even unrecognizable texture imaging.

[0047] In view of the above technical problems existing in the related art, embodiments of the present disclosure provide a display panel, as Figure 1 and Figure 2 shown, including:

[0048] A substrate substrate 101;

[0049] A plurality of light-emitting devices 102, located above the substrate substrate 101;

[0050] A plurality of photosensitive devices 103, located between the layer where the plurality of light-emitting devices 102 are located and the substrate substrate 101; the plurality of photosensitive devices 103 are configured to collect the emitted light of the plurality of light-emitting devices 102 reflected by the fingerprint; the orthographic projection of each photosensitive device 103 on the substrate substrate 101 is located at the gap between the orthographic projections of each light-emitting device 102 on the substrate substrate 101;

[0051] A light-shielding portion 104, located on the light-incident side of the plurality of photosensitive devices 103, the orthographic projection of the light-shielding portion 104 on the substrate substrate 101 overlaps with the edge region of the orthographic projection of the photosensitive device 103; and the light-shielding portion 104 has a first opening, and the orthographic projection of the first opening on the substrate substrate 101 overlaps with the middle region of the orthographic projection of the photosensitive device 103.

[0052] In the above display panel provided by the embodiments of the present disclosure, the light-emitting device 102 serves as the point light source of the photosensitive device 103, and the light with an emission angle within 42° to 70° belongs to the signal light during the fingerprint recognition process. By providing the light-shielding portion 104 that blocks the edge region of the photosensitive device 103, the ambient light incident perpendicularly to the photosensitive surface of the photosensitive device 103 is effectively blocked, so that most of the light received by the photosensitive device 103 is signal light, effectively avoiding the influence of the ambient light on the signal light and improving the optical signal-to-noise ratio (SNR).

[0053] Optionally, in the above display panel provided by the embodiments of the present disclosure, as Figure 2 and Figure 3As shown, the light-emitting device 102 is a top-emitting light-emitting device, including: an anode 1021, a cathode 1022 located on the side of the anode 1021 away from the substrate 101, and a light-emitting functional layer 1023 located between the anode 1021 and the cathode 1022. Specifically, the light-emitting functional layer 1023 may include a hole injection layer, a hole transport layer, an electron blocking layer, an organic electroluminescent layer or a quantum dot light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer;

[0054] The photosensitive device 103 includes: a metal electrode 1031 and a transparent electrode 1032 disposed opposite to each other, and a photoelectric conversion layer located between the metal electrode 1031 and the transparent electrode 1032. Among them, the transparent electrode 1032 is located between the layer where the metal electrode 1031 is located and the layer where the anode 1021 is located. Specifically, the photoelectric conversion layer is composed of a P-type semiconductor layer 1033, an intrinsic semiconductor layer 1034, and an N-type semiconductor layer 1035 stacked;

[0055] The light-shielding portion 104 is located between the layer where the transparent electrode 1032 is located and the light-emitting functional layer 1023.

[0056] Since the photosensitive device 103, the light-shielding portion 104, and the top-emitting photosensitive device 103 are sequentially stacked on the substrate 101, the emitted light of the top-emitting light-emitting device 102 can be reflected by a finger and then enter the photosensitive device 103 through the film layer where the light-shielding portion 104 is located. At the same time, the light-shielding portion 104 reduces the incidence of ambient light to a certain extent, thereby reducing the interference of ambient light and improving the accuracy of fingerprint recognition.

[0057] Optionally, in the above display panel provided by the embodiments of the present disclosure, the anode 1021 is reused as the light-shielding portion 104. At this time, the gap between the anodes 1021 is the first opening of the light-shielding portion 104.

[0058] Reusing the anode 1021 in the related art as the light-shielding portion 104 avoids manufacturing the light-shielding portion 104 through a separate mask process, thereby simplifying the manufacturing process, saving mask costs, and achieving a thin and light design. Specifically, the anode 1021 may be an electrode with a low reflectivity after being ashed on the surface with ozone or the like.

[0059] Optionally, in the above display panel provided by the embodiments of the present disclosure, when the anode 1021 is reused as the light-shielding portion 104, the light-shielding portion 104 can specifically block the edge region of the photosensitive device 103 through the following three possible implementation manners:

[0060] The first implementation manner is to keep the size of the photosensitive device 103 unchanged, and at the same time increase the size of the anode 1021 to achieve the edge overlap of the anode 1021 and the photosensitive device 103, as Figure 4as shown;

[0061] In the second implementation method, while keeping the size of the anode 1021 unchanged, the size of the photosensitive device 103 is increased to achieve the edge overlap between the anode 1021 and the photosensitive device 103, as Figure 5 shown;

[0062] In the third implementation method, the sizes of both the photosensitive device 103 and the anode 1021 are changed simultaneously to achieve the edge overlap between the anode 1021 and the photosensitive device 103.

[0063] Since only one of the sizes of the photosensitive device 103 or the anode 1021 needs to be changed in the first two implementation methods, only the mask plate used to fabricate the photosensitive device 103 or the anode 1021 needs to be changed accordingly, so the cost is relatively low.

[0064] In specific implementation, after forming the edge overlap between the light-shielding portion 104 and the photosensitive device 103 by using any of the above implementation methods, the obtained display panel can be as Figure 2 shown, including: a pixel defining layer 105 located between the layer where the anode 1021 is located and the layer where the transparent electrode 1032 is located, and having a plurality of pixel openings;

[0065] The orthographic projection of the anode 1021 on the substrate 101 completely covers the orthographic projection of the pixel opening, and the overlapping area of the edge region of the orthographic projection of the anode 1021 and the orthographic projection of the photosensitive device 103 is located within the orthographic projection of the pixel defining layer 105.

[0066] In addition, after forming the edge overlap between the light-shielding portion 104 and the photosensitive device 103 by using the second implementation method as described above, the obtained display panel can also be as shown in FIG. 3, including: a pixel defining layer 105 located between the layer where the anode 1021 is located and the layer where the transparent electrode 1032 is located, and having a plurality of pixel openings;

[0067] The orthographic projection of the anode 1021 on the substrate 101 completely covers the orthographic projection of the pixel opening, and a partial overlapping area of the edge region of the orthographic projection of the anode 1021 and the orthographic projection of the photosensitive device 103 is located within the orthographic projection of the pixel opening.

[0068] During the fingerprint recognition process, in addition to the light emitted by the light-emitting device 103 being sensed by the photosensitive device 103, the photosensitive device 103 may also sense ambient light incident through the finger. This ambient light may interfere with the fingerprint recognition of the photosensitive device 103. For example, when the ambient light shines directly above the finger, the ambient light can pass through the finger and excite the biological tissue inside the finger to emit pigment light, which may interfere with fingerprint recognition. Through detection, this pigment light mainly includes light with a wavelength above 600 nm. Therefore, in some embodiments, the pixel defining layer 105 can be configured to filter light with a wavelength greater than 600 nm, such as filtering light with a wavelength of 600 nm - 900 nm. Specifically, the material of the pixel defining layer 103 includes an organic resin material doped with a colored dye, so that the pixel defining layer 105 forms a certain filtering effect on light with a wavelength of 600 nm - 900 nm. This colored dye can include bromoamino acid derivatives, etc. Thus, through the cooperation of the light-shielding portion 104 and the pixel defining layer 105, it is possible to ensure the passage of signal light while improving the influence of ambient light and the photosensitive device 103, and improving the accuracy of pattern recognition.

[0069] Optionally, in the above display panel provided by the embodiments of the present disclosure, as Figures 6 to 8 shown, the light-emitting device 102 is a bottom-emitting light-emitting device 102, including: an anode 1021, a cathode 1022 located on the side of the anode 1021 facing the substrate 101, and a light-emitting functional layer 1023 located between the anode 1021 and the cathode 1022;

[0070] The photosensitive device 103 includes: a metal electrode 1031 and a transparent electrode 1032 disposed opposite to each other, and a photoelectric conversion layer located between the transparent electrode 1032 and the metal electrode 1031, wherein the metal electrode 1031 is located between the layer where the transparent electrode 1032 is located and the layer where the cathode 1022 is located; specifically, the photoelectric conversion layer is composed of a P-type semiconductor layer 1033, an intrinsic semiconductor layer 1034, and an N-type semiconductor layer 1035 stacked;

[0071] The light-shielding portion 104 is located between the layer where the transparent electrode is located and the substrate 101.

[0072] Since the light-shielding portion 104, the photosensitive device 103, and the bottom-emitting photosensitive device 103 are sequentially stacked on the substrate 101, the emitted light of the bottom-emitting light-emitting device 102 can be reflected by the finger and then enter the photosensitive device 103 through the film layer where the light-shielding portion 104 is located. At the same time, the light-shielding portion 104 reduces the incidence of ambient light to a certain extent, so the interference of ambient light is reduced and the accuracy of fingerprint recognition is improved.

[0073] Optionally, in the above display panel provided by the embodiments of the present disclosure, as Figures 6 to 8As shown, it further includes: a plurality of top-gate transistors located between the substrate 101 and the layer where the transparent electrode 1032 is located (specifically, it may include a first transistor 106 electrically connected to the light-emitting device 102 and a second transistor 107 electrically connected to the photosensitive device 103), and a light-shielding metal layer 108 located between the layer where the plurality of top-gate transistors are located and the substrate 101; wherein, the light-shielding metal layer 108 is reused as the light-shielding portion 104.

[0074] Using the light-shielding metal layer 108 in the related art as the light-shielding portion 104 avoids manufacturing the light-shielding portion 104 through a separate mask process, thereby simplifying the manufacturing process, saving the mask cost, and achieving a thin and light design.

[0075] Optionally, in the above display panel provided by the embodiments of the present disclosure, when the light-shielding metal layer 108 is reused as the light-shielding portion 104, the light-shielding portion 104 can specifically block the edge region of the photosensitive device 103 through the following three possible implementation manners:

[0076] The first implementation manner is to keep the size of the photosensitive device 103 unchanged and increase the size of the light-shielding metal layer 108 at the same time to achieve the edge overlap between the light-shielding metal layer 108 and the photosensitive device 103, as Figure 7 shown;

[0077] The second implementation manner is to keep the size of the light-shielding metal layer 108 unchanged and increase the size of the photosensitive device 103 at the same time to achieve the edge overlap between the light-shielding metal layer 108 and the photosensitive device 103, as Figure 8 shown;

[0078] The third implementation manner is to change the size of the photosensitive device 103 and the size of the light-shielding metal layer at the same time to achieve the edge overlap between the light-shielding metal layer and the photosensitive device 103.

[0079] Since the first two implementation manners only need to change the size of one of the photosensitive device 103 or the light-shielding metal layer, and correspondingly only need to change the mask plate for manufacturing the photosensitive device 103 or the light-shielding metal layer, the cost is relatively low.

[0080] In specific implementation, after forming the edge overlap between the light-shielding portion 104 and the photosensitive device 103 by using any of the above implementation manners, the orthographic projection of the obtained light-shielding metal layer 108 on the substrate 101 can specifically completely coincide with the orthographic projection of the active layer and the edge region of the orthographic projection of the photosensitive device 103, as Figure 7 and Figure 8 shown. In other words, the integrated pattern of the light-shielding metal layer 108 blocks the active layer and the edge region of the photosensitive device 103, and has a first opening in the middle region of the photosensitive device 103 and a second opening in the region where the light-emitting device 102 is located.

[0081] Optionally, in the above display panel provided by the embodiments of the present disclosure, as Figure 9 and Figure 10 shown, to ensure the overall uniformity of the fingerprint recognition effect, the width of the overlapping area between the orthographic projection of the light-shielding portion 104 on the substrate 101 and the edge area of the orthographic projection of the plurality of photosensitive devices 103 is the same.

[0082] Optionally, in the above display panel provided by the embodiments of the present disclosure, to enable the photosensitive device 103 to receive the reflected light at a large angle, so as to further improve the signal-to-noise ratio, as Figure 10 shown, the width d of the edge area of the photosensitive device 103 (i.e., the overlapping area with the light-shielding portion 104) can be set to satisfy the following relational expression:

[0083] d = h * tanθ

[0084] where h is the distance between the layer where the light-shielding portion 104 is located and the layer where the plurality of photosensitive devices 103 are located in the direction perpendicular to the substrate 101, and θ is the maximum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices 103 (for example, 70°).

[0085] It should be noted that under the condition of d = h * tanθ, the light S1 with the maximum reflection angle can just enter the outer boundary of the overlapping area between the light-shielding portion 104 and the photosensitive device 103, as Figure 10 shown. Of course, in specific implementation, d can also be greater than h * tanθ, and at this time, the light S1 with the maximum reflection angle enters the overlapping area between the light-shielding portion 104 and the photosensitive device 103. However, for the display panel including the bottom-emitting light-emitting device 102, the photosensitive device 103 is located in the non-opening area of the display panel. If the value of d is large, it may affect the pixel aperture ratio. Therefore, preferably, d takes the value of h * tanθ. Exemplarily, 2.7μm ≤ d ≤ 11μm.

[0086] In addition, theoretically, d should be equal to (h + h') * tanθ, where h' is the thickness of the light-shielding portion 104. Since the thickness of the light-shielding portion 104 is very small and can be ignored, the value is taken as h * tanθ.

[0087] Optionally, in the above display panel provided by the embodiments of the present disclosure, to enable the photosensitive device 103 to receive the reflected light at a small angle, so as to further improve the signal-to-noise ratio, the width D of the photosensitive device 103 can be set to satisfy the following relational expression:

[0088] D ≥ h * (tanθ + 2tanθc), or D = L + 2h * tanθ

[0089] Wherein, h is the distance between the layer where the light-shielding portion 104 is located and the layer where the multiple photosensitive devices 103 are located in the direction perpendicular to the substrate 101, θ is the maximum reflection angle of the light reflected by the fingerprint to the multiple photosensitive devices 103 (for example, 70°), θc is the minimum reflection angle of the light reflected by the fingerprint to the multiple photosensitive devices 103 (i.e., the critical angle of total reflection, for example, 42°), and L is the width of the first opening. Exemplarily, 18μm ≤ D ≤ 40μm.

[0090] It should be noted that, as Figure 10 shown, under the condition of D ≥ h * (tanθ + 2tanθc), the light S2 with the minimum reflection angle, and both the light S2 with the minimum reflection angle and the light S1 with the maximum reflection angle can enter the area between the overlapping area of the light-shielding portion 104 and the photosensitive device 103 (i.e., the middle area of the photosensitive device), and the ambient light directly above the overlapping area of the light-shielding portion 104 and the photosensitive device 103, as well as the ambient light with an incident angle less than the minimum reflection angle, are blocked by the light-shielding portion 104 and cannot enter the photosensitive device 103. Therefore, all the signal light S can be effectively incident on the photosensitive device 103, and the crosstalk of the ambient light incident directly above the overlapping area of the light-shielding portion 104 and the photosensitive device 103, as well as the ambient light with an incident angle less than the minimum reflection angle, is avoided, thereby maximizing the signal-to-noise ratio.

[0091] In addition, when keeping the size of the light-shielding portion 104 unchanged and realizing the edge overlap of the light-shielding portion 104 and the photosensitive device 103 by changing the size of the photosensitive device 103, the distance L between the light-shielding portions 104 remains unchanged, and the width d of the overlapping area is h * tanθ. Therefore, the lateral size of the photosensitive device 103 is D = L + 2h * tanθ. Specifically, L can be greater than, equal to, or less than 2h * tanθc. Exemplarily, 13.6μm ≤ L ≤ 34.6μm.

[0092] Optionally, in the above display panel provided by the embodiments of the present disclosure, according to the process thickness design ability value, h can be greater than or equal to 1μm and less than or equal to 4μm.

[0093] Generally, in the display panel provided by the embodiments of the present disclosure, as Figures 1 to 3 、 Figures 8 to 10 shown, it may further include: a spacer layer 109, a packaging layer 110, a first optical adhesive layer 111, a touch control electrode layer 112, a second optical adhesive layer 113, a protection cover plate 114, a first planar layer 115, a sidewall protection layer 116, a bias line 117, a second planar layer 118, a first dielectric layer 119, a second dielectric layer 120, a gate insulating layer 121, and a third planar layer 122.

[0094] In addition, the embodiments of the present disclosure further provide three specific embodiments, one of which is a display panel in the related art as a comparative example, and the other two are display panels provided by the present disclosure, respectively labeled as Embodiment 1 and Embodiment 2. Specifically, with the anodes reused as the light-shielding portions, in the comparative example, the anodes and the photosensitive devices do not overlap with each other, the lateral width D of the photosensitive device is 18 μm, and the distance L between adjacent anodes is 18 μm; in Embodiment 1, the lateral width D of the photosensitive device remains unchanged at 18 μm, and the lateral width of the anode expands outward, such that the width d of the overlapping region between the anode and the photosensitive device is 3 μm, and at this time the distance L between adjacent anodes is 12 μm; in Embodiment 2, the distance L between adjacent anodes remains unchanged at 18 μm (i.e., the lateral width of the anode remains unchanged), and the lateral width of the photosensitive device expands outward, such that the width d of the overlapping region between the anode and the photosensitive device is 3 μm, and at this time the lateral width D of the photosensitive device is 24 μm. The simulation results show that the signal-to-noise ratio of the comparative example is 12, the signal-to-noise ratio of Embodiment 1 is 48, and the signal-to-noise ratio of Embodiment 2 is 28. It can be seen that the present disclosure improves the signal-to-noise ratio by blocking part of the ambient light. It should be understood that when the overlapping regions between the anodes and the photosensitive devices are the same, the signal-to-noise ratios of Embodiment 1 and Embodiment 2 are different, which is mainly caused by the different light-receiving areas of the photosensitive devices.

[0095] Based on the same inventive concept, the embodiments of the present disclosure further provide a display device, including the above-mentioned display panel provided by the embodiments of the present disclosure. The display device may be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a smart watch, a fitness bracelet, a personal digital assistant, or any other product or component with a display function. Other essential components of the display device are understood by those of ordinary skill in the art and will not be elaborated herein, nor should they be regarded as a limitation to the present disclosure. In addition, since the principle of solving the problem of the display device is similar to that of the above-mentioned display panel, the implementation of the display device may refer to the embodiments of the above-mentioned display panel, and the repeated parts will not be elaborated.

[0096] The above-mentioned display panel and display device provided by the embodiments of the present disclosure include: a substrate; a plurality of light-emitting devices located on the substrate; a plurality of photosensitive devices located between the layer where the plurality of light-emitting devices are located and the substrate; the plurality of photosensitive devices are configured to collect the emitted light of the plurality of light-emitting devices reflected by a fingerprint; the orthographic projection of each photosensitive device on the substrate is located at a gap between the orthographic projections of each light-emitting device on the substrate; a light-shielding portion located on the light-incident side of the plurality of photosensitive devices, and the orthographic projection of the light-shielding portion on the substrate overlaps with the edge region of the orthographic projection of the photosensitive device; and the light-shielding portion has a first opening, and the orthographic projection of the first opening on the substrate overlaps with the middle region of the orthographic projection of the photosensitive device. The light-emitting device serves as a point light source for the photosensitive device, and the light with an emission angle within 42° to 70° belongs to the signal light in the fingerprint recognition process. By providing a light-shielding portion that blocks the edge region of the photosensitive device, the ambient light incident perpendicularly to the photosensitive surface of the photosensitive device is effectively blocked, so that most of the light received by the photosensitive device is signal light, effectively avoiding the influence of ambient light on the signal light and improving the optical signal-to-noise ratio.

[0097] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A display panel, in, include: substrate substrate; A plurality of light emitting devices are located on the substrate; A plurality of photosensitive devices are located between the layer where the plurality of light-emitting devices are located and the substrate; The plurality of photosensitive devices are configured to collect the emitted light of the plurality of light emitting devices reflected by the fingerprint; The orthographic projection of each of the photosensitive devices on the substrate is located at a gap between the orthographic projections of each of the light-emitting devices on the substrate; A light shielding portion is located at the light incident side of the plurality of photosensitive devices, and the orthographic projection of the light shielding portion on the substrate overlaps with the edge area of ​​the orthographic projection of the photosensitive device; and the light shielding portion has a first opening, and the orthographic projection of the first opening on the substrate overlaps with the middle area of ​​the orthographic projection of the photosensitive device; The width d of the edge region of the photosensitive device satisfies the following relationship: d=h*tanθ Wherein, h is the distance between the layer where the light shielding portion is located and the layer where the multiple photosensitive devices are located in a direction perpendicular to the base substrate, and θ is the maximum reflection angle of light reflected from the fingerprint to the multiple photosensitive devices.

2. The display panel according to claim 1, in, The light emitting device is a top-emitting light emitting device, comprising: an anode, a cathode located on a side of the anode away from the substrate, and a light emitting functional layer located between the anode and the cathode; The photosensitive device comprises: a metal electrode and a transparent electrode disposed opposite to each other, and a photoelectric conversion layer located between the metal electrode and the transparent electrode, wherein the transparent electrode is located between the layer where the metal electrode is located and the layer where the anode is located; The light shielding portion is located between the layer where the transparent electrode is located and the light emitting functional layer.

3. The display panel according to claim 2, in, The anode is reused as the light shielding portion.

4. The display panel according to claim 3, in, It also includes: a pixel defining layer located between the layer where the anode is located and the layer where the transparent electrode is located and having a plurality of pixel openings; The orthographic projection of the anode on the base substrate completely covers the orthographic projection of the pixel opening, and an overlapping area with an edge area of ​​the orthographic projection of the photosensitive device is located within the orthographic projection of the pixel defining layer.

5. The display panel according to claim 3, in, It also includes: a pixel defining layer located between the layer where the anode is located and the layer where the transparent electrode is located and having a plurality of pixel openings; The orthographic projection of the anode on the substrate completely covers the orthographic projection of the pixel opening, and a partially overlapping area with an edge area of ​​the orthographic projection of the photosensitive device is located within the orthographic projection of the pixel opening.

6. The display panel according to claim 1, in, The light emitting device is a bottom emission type light emitting device, comprising: an anode, a cathode located on the side of the anode facing the substrate, and a light emitting functional layer located between the anode and the cathode; The photosensitive device includes: a metal electrode and a transparent electrode disposed opposite to each other, and a photoelectric conversion layer located between the transparent electrode and the metal electrode, wherein the metal electrode is located between the layer where the transparent electrode is located and the layer where the cathode is located; The light-shielding portion is located between the layer where the transparent electrode is located and the substrate.

7. The display panel according to claim 6, wherein, further includes: a plurality of top-gate transistors located between the substrate and the layer where the transparent electrode is located, and a light-shielding metal layer located between the layer where the plurality of top-gate transistors are located and the substrate; wherein the light-shielding metal layer is reused as the light-shielding portion.

8. The display panel according to claim 7, wherein, The orthographic projection of the light-shielding metal layer on the substrate completely coincides with the orthographic projection of the active layer and the edge region of the orthographic projection of the photosensitive device.

9. The display panel according to claim 1, wherein, The width of the overlapping portion of the orthographic projection of the light-shielding portion on the substrate and the edge regions of the orthographic projections of the plurality of photosensitive devices is the same.

10. The display panel according to claim 1, wherein, The width D of the photosensitive device satisfies the following relationship: D≥h*(tanθ + 2tanθc), or D = L + h*tanθ where h is the distance between the layer where the light-shielding portion is located and the layer where the plurality of photosensitive devices are located in a direction perpendicular to the substrate, θ is the maximum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices, θc is the minimum reflection angle of the light reflected by the fingerprint to the plurality of photosensitive devices, and L is the width of the first opening.

11. The display panel according to claim 1 or 10, wherein, The h is greater than or equal to 1 μm and less than or equal to 4 μm.

12. A display device, wherein, includes the display panel according to any one of claims 1-11.

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