Display panel and display device

Abstract

The application relates to the technical field of display, in particular to a display panel and a display device. The display panel comprises a substrate, a pixel definition layer and a light emitting device located on one side of the substrate; the pixel definition layer comprises a first opening and a second opening, and at least part of the light emitting device is located in the second opening; a light shielding layer is located on the side of the pixel definition layer close to the substrate; the light shielding layer comprises a third opening and a fourth opening; along the direction perpendicular to the plane where the substrate is located, the third opening overlaps the first opening, and the fourth opening overlaps the second opening; an optical sensor is located on the side of the light shielding layer close to the substrate; along the direction perpendicular to the plane where the substrate is located, the optical sensor overlaps the first opening and the third opening. The application can add a layer of sleeve holes in the light path of the optical sensor without increasing the number of masks, can reduce the reflected light in the panel received by the optical sensor, reduce the interference signal received by the optical sensor, and improve the signal-to-noise ratio of the output signal of the optical sensor.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and a display device. Background Technology

[0002] With the continuous upgrading of electronic devices, optical sensors are increasingly being used in display devices. Embedding optical sensors into the display module can not only increase the amount of light signal but also reduce the thickness of the display module. However, embedding optical sensors into the display module leads to the optical sensors receiving more interference signals reflected from inside the screen, reducing the signal-to-noise ratio of the output signal. Therefore, properly designing the optical path to reduce in-screen reflections is a crucial issue. Summary of the Invention

[0003] This invention provides a display panel and a display device to solve the technical problem of reducing signal interference and improving the signal-to-noise ratio of optical sensor output signals.

[0004] In a first aspect, embodiments of the present invention provide a display panel, the display panel comprising: A substrate, and a pixel definition layer and a light-emitting device located on one side of the substrate; the pixel definition layer includes a first opening and a second opening, and at least a portion of the light-emitting device is located within the second opening; A light-shielding layer is located on the side of the pixel definition layer close to the substrate; the light-shielding layer includes a third opening and a fourth opening; along the direction perpendicular to the plane where the substrate is located, the third opening overlaps with the first opening, and the fourth opening overlaps with the second opening; An optical sensor is located on the side of the light-shielding layer closest to the substrate; along the direction perpendicular to the plane of the substrate, the optical sensor overlaps with the first opening and the third opening.

[0005] Secondly, based on the same inventive concept, embodiments of the present invention provide a display device, including a display panel provided in any embodiment of the present invention.

[0006] The display panel and display device provided in this invention have the following beneficial effects: A light-shielding layer is provided between the film layer containing the light-emitting device and the film layer containing the optical sensor. The third opening in the light-shielding layer overlaps with the first opening in the pixel definition layer, and the fourth opening in the light-shielding layer overlaps with the second opening in the pixel definition layer. The light-shielding layer and the pixel definition layer can be fabricated using the same photomask, which reduces the number of photomasks used, increases photomask utilization, and reduces manufacturing costs. Both the first opening in the pixel definition layer and the third opening in the light-shielding layer overlap with the optical sensor, forming two layers of apertures above the optical sensor. This limits the light-gathering angle of the optical sensor, reduces interference light received by the optical sensor, improves the signal-to-noise ratio of the optical sensor's output signal, and thus enhances the sensitivity of optical detection. This invention can add a layer of apertures to the optical path of the optical sensor without increasing the number of photomasks used, thereby reducing the reflected light from within the panel received by the optical sensor, reducing interference signals received by the optical sensor, and improving the signal-to-noise ratio of the optical sensor's output signal. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 A schematic diagram of a display panel provided in an embodiment of the present invention; Figure 2 This is a partial top view of the pixel definition layer and the light-shielding layer in some embodiments of the present invention; Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0011] Various modifications and variations can be made to this invention without departing from its spirit or scope, as will be apparent to those skilled in the art. Therefore, this invention is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this invention can be combined with each other without contradiction.

[0012] In related technologies, optical sensors are embedded within display modules. A light-entry aperture needs to be fabricated above the optical sensor to ensure the reception of light signals. However, due to the stacking of multiple film layers above the optical sensor, multiple film layers also stack around the light-entry aperture. This makes the aperture susceptible to other interference signals, especially internal reflection signals from light emitted by devices within the display module and reflected back to the sensor within the film layers. This interference signal severely reduces the signal-to-noise ratio of the sensor's output signal and decreases the sensitivity of optical detection.

[0013] To address the aforementioned issues, embodiments of the present invention provide a display panel in which an optical sensor is embedded within the display panel. An additional light-shielding layer is fabricated using the mask from the pixel definition layer process, and this light-shielding layer is placed between the optical sensor and the light-emitting device. This effectively limits the light-receiving angle of the optical sensor, reduces interference signals reflected from within the panel in the received signal, and improves the signal-to-noise ratio of the optical sensor's output signal. Furthermore, the added light-shielding layer shares a single mask with the pixel definition layer, reducing the number of masks required and lowering manufacturing costs.

[0014] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of the present invention. Figure 1 This illustrates the film layer structure of the display panel. (For example...) Figure 1As shown, the display panel includes a substrate 00, and a pixel definition layer 10, a light-emitting device 20, a light-shielding layer 30, and an optical sensor 40 located on one side of the substrate 00. The pixel definition layer 10 includes a first opening 11 and a second opening 12, with at least a portion of the light-emitting device 20 located within the second opening 12; the first opening 11 is a light-transmitting opening, and the second opening 12 is a pixel opening. The light-shielding layer 30 is located on the side of the pixel definition layer 10 closest to the substrate 00; the light-shielding layer 30 includes a third opening 31 and a fourth opening 32; along a direction e perpendicular to the plane of the substrate 00, the third opening 31 overlaps with the first opening 11, and the fourth opening 32 overlaps with the second opening 12. The optical sensor 40 is located on the side of the light-shielding layer 30 closest to the substrate 00; along a direction e perpendicular to the plane of the substrate 00, the optical sensor 40 overlaps with the first opening 11 and the third opening 31. Figure 1 The schematic display panel also includes a driving layer 60, in which pixel circuitry and sensor circuitry connected to the optical sensor 40 are disposed. The driving layer 60 is located on the side of the film layer containing the optical sensor 40 closer to the substrate 00. The optical sensor 40 can be a fingerprint sensor or an ambient light sensor.

[0015] In this embodiment of the invention, a light-shielding layer 30 is provided between the film layer containing the light-emitting device 20 and the film layer containing the optical sensor 40. The light-shielding layer 30 has a third opening 31 that overlaps with the first opening 11 and a fourth opening 32 that overlaps with the second opening 12. That is, the light-shielding layer 30 and the pixel definition layer 10 have overlapping openings at the same location. Therefore, the light-shielding layer 30 and the pixel definition layer 10 can be fabricated using the same photomask, reducing the number of photomasks used, increasing photomask utilization, and reducing manufacturing costs. The first opening 11 of the pixel definition layer 10 and the third opening 31 of the light-shielding layer 30 both overlap with the optical sensor 40. The first opening 11 and the third opening 31 are stacked to form the light-entry hole above the optical sensor 40, while the fourth opening 32 in the light-shielding layer 30 is a dummy opening. The fourth opening 32 is a structural feature obtained by fabricating the light-shielding layer 30 and the pixel definition layer 10 using the same photomask. In this embodiment of the invention, the two layers of apertures formed by the first opening 11 and the third opening 31 can limit the light-gathering angle, reduce the interference light received by the optical sensor 40, improve the signal-to-noise ratio of the optical sensor's output signal, and thus enhance the sensitivity of optical detection. This invention can add a layer of apertures to the optical path of the optical sensor 40 without increasing the number of photomasks used, thereby reducing the amount of reflected light from within the panel received by the optical sensor 40, reducing interference signals received by the optical sensor 40, and improving the signal-to-noise ratio of the optical sensor 40's output signal. In this embodiment of the invention, the pixel definition layer 10 is made of a black material. The pixel definition layer 10 and the light-shielding layer 30 are stacked on top of the optical sensor 40. The first opening 11 in the pixel definition layer 10 and the third opening 31 in the light-shielding layer 30 overlap to form a double-layer light-inlet sleeve. The cooperation of the first opening 11 and the third opening 31 can limit the light-inlet angle, improve the light-inlet collimation, reduce the interference light received by the optical sensor 40, improve the signal-to-noise ratio of the output signal of the optical sensor, and thus improve the sensitivity of optical detection.

[0016] In some embodiments of the present invention, the material of the light-shielding layer 30 is the same as the material of the pixel definition layer 10. In these embodiments, the light-shielding layer 30 and the pixel definition layer 10 can be fabricated using the same photomask, reducing the number of photomasks used, increasing photomask utilization, and lowering manufacturing costs. Furthermore, since the material of the light-shielding layer 30 and the pixel definition layer 10 is the same, both layers are made of the same material, simplifying the design of process parameters and other aspects during fabrication, thus simplifying the manufacturing process.

[0017] For example, such as Figure 1 As shown, along the direction e perpendicular to the plane containing the substrate 00, the thickness of the light-shielding layer 30 is D1, and the thickness of the pixel definition layer 10 is D2. The thickness of the light-shielding layer 30, D1, is less than the thickness of the pixel definition layer 10, D2. In this embodiment of the invention, the light-shielding layer 30 and the pixel definition layer 10 can be fabricated using the same mask, reducing the number of masks used, increasing mask utilization, and reducing manufacturing costs. Since the light-shielding layer 30 is located between the pixel definition layer 10 and the film layer containing the optical sensor 40, and the main function of the light-shielding layer 30 is to limit the light-incident angle, the angle of light transmitted through the third opening 31 can be adjusted by appropriately setting the thickness of the light-shielding layer 30. Setting the thickness of the light-shielding layer 30 to be less than the thickness of the pixel definition layer 10 not only reduces the impact of adding the light-shielding layer 30 on the overall thickness of the display panel, but also, if the thickness of the light-shielding layer 30 is smaller, the etching time of its film layer will be relatively shorter, which can also reduce manufacturing costs to a certain extent.

[0018] In this embodiment of the invention, the first opening 11 is a light-transmitting opening on the pixel definition layer 10, the second opening 12 is a pixel opening on the pixel definition layer 10, the third opening 31 is a light-transmitting opening on the light-shielding layer 30, and the fourth opening 32 is a dummy opening on the light-shielding layer 30. The orthographic projection shape of the first opening 11 on the substrate 00 is the same as that of the third opening 31 on the substrate 00, and the orthographic projection shape of the second opening 12 on the substrate 00 is the same as that of the fourth opening 32 on the substrate 00. During the manufacturing of the display panel, the light-shielding layer 30 and the pixel definition layer 10 can be manufactured using the same photomask, so that the light-shielding layer 30 and the pixel definition layer 10 have overlapping openings at the same location, and the overlapping openings in the two layers have the same orthographic projection shape on the substrate 00. This embodiment of the invention can reduce the number of photomasks used, increase photomask utilization, and reduce manufacturing costs.

[0019] The embodiments of the present invention do not limit the orthographic projection shape of each opening on the substrate. The orthographic projection shape of the opening on the substrate can be a circle, an ellipse, a rectangle, a triangle or other shapes.

[0020] Figure 2 This is a partial top view of the pixel definition layer and the light-shielding layer in some embodiments of the present invention. Figure 2 The diagram illustrates the first opening 11 and the second opening 12 of the pixel definition layer 10, and the third opening 31 and the fourth opening 32 in the light-shielding layer 30. It can be understood that the top-view direction is parallel to the orthographic projection direction onto the substrate, such as the first opening 11 coinciding with its orthographic projection onto the substrate. Figure 2 It can be seen that the orthographic projection shapes of the first opening 11 and the third opening 31 on the substrate 00 are both circular, while the orthographic projection shapes of the second opening 12 and the fourth opening 32 on the substrate 00 are both rectangular. In this embodiment of the invention, the two openings that overlap each other along the direction perpendicular to the plane of the substrate 00 have the same shape. This is not a free setting of the shapes of the openings in the light-shielding layer 30 and the pixel definition layer 10, but rather a result obtained by using the same mask to fabricate the light-shielding layer 30 and the pixel definition layer 10.

[0021] For example, with Figure 2herein, the first opening 11 and the third opening 31 are schematically illustrated as circular, and the second opening 12 and the fourth opening 32 are schematically illustrated as rectangular. In the embodiment of the present invention, the orthographic projection area of the first opening 11 on the substrate 00 is smaller than the orthographic projection area of the second opening 12 on the substrate 00, and the orthographic projection area of the third opening 31 on the substrate 00 is smaller than the orthographic projection area of the fourth opening 32 on the substrate 00. Considering that the functions of the openings are different, the first opening 11 in the pixel defining layer 10 is a light transmission opening, and the second opening 12 is a pixel opening. Setting the area of the first opening 11 to be smaller than the area of the second opening 20 can fabricate the light transmission opening in the display panel without affecting the aperture ratio of the display panel. In addition, the light shielding layer 30 and the pixel defining layer 10 are fabricated using the same mask plate, so the area size relationship between the third opening 31 and the fourth opening 32 in the light shielding layer 30 is the same as the area size relationship between the corresponding openings in the pixel defining layer 10.

[0022] In the embodiment of the present invention, the first opening 11 and the third opening 31 overlap to serve as a light inlet aperture of the optical sensor 40, and the first opening 11 is located in the pixel defining layer 10. The present invention does not limit the relative positional relationship between the first opening 11 and the second opening 12 in the pixel defining layer 10. The arrangement position of the first opening 11 is related to the pixel arrangement mode in the display panel. Figure 2 herein only schematically illustrates the case where the first opening 11 is located at the middle position where four second openings 12 converge.

[0023] In addition, the embodiment of the present invention does not limit the number of the third openings 31 overlapping with one optical sensor 40. One optical sensor 40 may overlap with one third opening 31, or may overlap with two or more third openings 31.

[0024] In some embodiments of the present invention, the orthographic projection area of the third opening 31 on the substrate 00 is smaller than the orthographic projection area of the first opening 11 on the substrate 00, and the orthographic projection area of the fourth opening 32 on the substrate 00 is smaller than the orthographic projection area of the second opening 12 on the substrate 00. For example, Figure 3 is a schematic diagram of another display panel provided by the embodiment of the present invention. Figure 3 schematically illustrates the length of each opening in the cross-sectional view in the direction parallel to the plane where the substrate 00 is located. For example, the length of the first opening 11 is d1, the length of the second opening 12 is d2, the length of the third opening 31 is d3, and the length of the fourth opening 32 is d4, where d3<d1, d4<d2. That is, the area size of the third opening 31 is smaller than the area size of the first opening 11, and the area size of the fourth opening 32 is smaller than the area size of the second opening 12.

[0025] In this embodiment of the invention, the first opening 11 and the third opening 31 are stacked as the light-entry aperture above the optical sensor 40. The third opening 31 is closer to the optical sensor 40 than the first opening 11. Setting the area of ​​the third opening 31 to be smaller than that of the first opening 11 helps to reduce the amount of internally reflected light received by the optical sensor 40, which in turn helps to reduce the interference light received by the optical sensor 40, thereby improving the signal-to-noise ratio of the output signal of the optical sensor and enhancing the sensitivity of optical detection. The second opening 12 and the first opening 11 are fabricated in the same process, and the fourth opening 32 and the third opening 31 are fabricated in the same process. The same photomask is used in both processes. Therefore, the area relationship between the fourth opening 32 and the second opening 12 is the same as that between the third opening 31 and the first opening 11, that is, the area of ​​the fourth opening 32 is smaller than that of the second opening 12.

[0026] In the display panel manufacturing process, the light-shielding layer 30 uses the same photomask as the pixel definition layer 10. By differentiating the exposure amounts in the two processes, the size of the openings obtained after exposure-etching can be adjusted. For example, increasing the exposure amount in the manufacturing process of the light-shielding layer 30 makes the area of ​​the third opening 31 in the light-shielding layer 30 smaller than the area of ​​the first opening 11 in the pixel definition layer 10, and the area of ​​the fourth opening 32 in the light-shielding layer 30 smaller than the area of ​​the second opening 12 in the pixel definition layer 10.

[0027] In this embodiment of the invention, the light-shielding layer 30 and the pixel definition layer 10 are respectively fabricated using an exposure-etching process, so the sidewalls of the openings in the light-shielding layer 30 and the pixel definition layer 10 are generally sloped.

[0028] For example, Figure 4 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 4 As shown, the openings (third opening 31 and fourth opening 32) in the light-shielding layer 30 have a shorter opening length on the side closer to the substrate 00 than on the side farther from the substrate 00. Similarly, the openings (first opening 11 and second opening 12) in the pixel definition layer 10 have a shorter opening length on the side closer to the substrate 00 than on the side farther from the substrate 00. The opening length on the side closer to the substrate 00 in the cross-sectional view is used as the length of the opening in the direction parallel to the plane of the substrate 00. For example, in the direction parallel to the plane of the substrate 00, the opening length of the first opening 11 on the side closer to the substrate 00 is d1, the opening length of the second opening 12 on the side closer to the substrate 00 is d2, the opening length of the third opening 31 on the side closer to the substrate 00 is d3, and the opening length of the fourth opening 32 on the side closer to the substrate 00 is d4, where d3... <d1,d4<d2。

[0029] For example, such as Figure 4 As shown, the angle between the inner wall of the first opening 11 and the plane where the substrate 00 is located, pointing towards the interior of the pixel definition layer 10, is the first slope angle θ1. The angle between the inner wall of the third opening 31 and the plane where the substrate 00 is located, pointing towards the interior of the light-shielding layer 30, is the second slope angle θ2, where θ2 > θ1. In this embodiment of the invention, the first opening 11 is fabricated in the pixel definition layer 10. The first opening 11 and the second opening 12 are fabricated in the same process. To ensure the light emission angle of the pixel, there are certain requirements for the slope angle of the second opening 12. At the same time, the first opening 11 and the third opening 31 are stacked together to form the light-entry aperture above the optical sensor 40. The third opening 31 is closer to the optical sensor 40 than the first opening 11. By setting the first slope angle θ1 and the second slope angle θ2 differently, and setting θ2 > θ1, the light received by the optical sensor 40 can be better restricted, the internal reflection light received by the optical sensor 40 from the panel can be reduced, and the interference light received by the optical sensor 40 can be reduced. This helps to improve the signal-to-noise ratio of the output signal of the optical sensor and enhance the sensitivity of optical detection.

[0030] For example, such as Figure 4 As shown, the angle between the inner wall of the second opening 12 and the plane where the substrate 00 is located, pointing towards the interior of the pixel definition layer 10, is the third slope angle θ3. The angle between the inner wall of the fourth opening 32 and the plane where the substrate 00 is located, pointing towards the interior of the light-shielding layer 30, is the fourth slope angle θ4, where θ4 > θ3. Since the first opening 11 and the second opening 12 are fabricated in the same process, the third slope angle θ3 is approximately equal to the first slope angle θ1. Since the third opening 31 and the fourth opening 32 are fabricated in the same process, the fourth slope angle θ4 is approximately equal to the second slope angle θ2.

[0031] For example, Figure 5 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 5 As shown, the light-emitting device 20 includes a first electrode 21, a light-emitting layer 23, and a second electrode 22. A second opening 12 exposes the first electrode 21. The light-emitting layer 23 is located on the side of the first electrode 21 away from the substrate 00, and the second electrode 22 is located on the side of the light-emitting layer 23 away from the substrate 00. Optionally, the first electrode 21 is an anode, the second electrode 22 is a cathode, and the material of the light-emitting layer 23 includes organic light-emitting materials or inorganic light-emitting materials. The second electrodes 22 of adjacent light-emitting devices 20 are interconnected to form a common electrode layer 22c; wherein at least a portion of the common electrode layer 22c is located within the first opening 11. Figure 5The diagram illustrates the deposition of the common electrode layer 22c along the sidewall and bottom of the first opening 11. In this embodiment, the light-shielding layer 30 and the pixel definition layer 10 can be fabricated using the same photomask, such that the third opening 31 of the light-shielding layer 30 overlaps with the first opening 11 in the pixel definition layer 10, and the fourth opening 32 of the light-shielding layer 30 overlaps with the second opening 12 in the pixel definition layer 10. The fourth opening 32 in the light-shielding layer 30 is a dummy opening and has no additional functionality, while the first opening 11 in the pixel definition layer 10 serves as a light-transmitting opening. After the pixel definition layer 10 process, the light-emitting layer 23 and the second electrode 22 of the light-emitting device 20 are fabricated, and the common electrode layer 22c is deposited within the second opening 12 along with the sidewall and bottom morphology. In other words, in this embodiment, the second opening 12 is not filled and planarized during fabrication. Considering the small area of ​​the second opening 12, the second electrode 22 will not block the common electrode layer 22c. In other words, the presence of the second opening 12 will not affect the electrical connection performance of the entire common electrode layer 22c. In this embodiment of the invention, at least a portion of the common electrode layer 22c is located within the first opening 11, saving the process of filling and planarizing the second opening 12, reducing the number of photomasks used, and saving manufacturing costs.

[0032] For example, Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 6 As shown, the pixel definition layer 10 includes a first opening 11 and a second opening 12, and the light-shielding layer 30 includes a third opening 31 and a fourth opening 32. Along the direction e perpendicular to the plane of the substrate 00, the third opening 31 overlaps with the first opening 11, and the fourth opening 32 overlaps with the second opening 12. The light-emitting device 20 includes a first electrode 21, a light-emitting layer 23, and a second electrode 22. The second electrodes 22 of adjacent light-emitting devices 20 are interconnected to form a common electrode layer 22c. A filter layer 13 is filled in the second opening 12, and at least a portion of the common electrode layer 22c is located on the side of the filter layer 13 away from the substrate 00. On the one hand, the filter layer 13 filling the second opening 12 can provide a relatively flat substrate for the fabrication of the common electrode layer 22c; on the other hand, the filter layer 13 can filter out non-visible light in the transmitted light, thereby further reducing the interference signal received by the optical sensor 40 and improving the signal-to-noise ratio of the output signal of the optical sensor 40.

[0033] For example, such as Figure 5As shown, the display panel includes a first planarization layer 51, which is located on the side of the pixel definition layer 10 near the light-shielding layer 30. At least a portion of the first planarization layer 51 fills the third opening 31 and the fourth opening 32. In this embodiment of the invention, a light-shielding layer 30 is added between the film layer containing the optical sensor 40 and the film layer containing the light-emitting device 20. The light-shielding layer 30 can be fabricated using the same photomask as the pixel definition layer 10. This allows for the addition of a perforated layer in the optical path of the optical sensor 40 without increasing the number of photomasks used. This reduces the amount of reflected light received by the optical sensor 40 from within the panel, reduces interference signals received by the optical sensor 40, and improves the signal-to-noise ratio of the output signal of the optical sensor 40. The fact that at least a portion of the first planarization layer 51 fills the third opening 31 and the fourth opening 32 in this embodiment of the invention provides a flat substrate, resulting in better flatness of the first electrode 21 of the light-emitting device 20 fabricated on the light-shielding layer 30. This avoids the risk of color shift in all four directions of the light-emitting device 20 due to insufficient substrate flatness.

[0034] For example, such as Figure 5 As shown, the display panel also includes a second planarization layer 52, which is located on the side of the light-shielding layer 30 closer to the optical sensor 40. The second planarization layer 52 is fabricated after the fabrication of the optical sensor 40, and provides a relatively flat substrate for the fabrication of the light-shielding layer 30.

[0035] For example, Figure 7 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 7 As shown, the light-shielding layer 30 at least partially surrounds the optical sensor 40. The surface of the light-shielding layer 30 closest to the substrate 00 is the first surface M1, and the surface of the optical sensor 40 furthest from the substrate 00 is the second surface M2. Figure 7 It can be seen that the vertical distance between the first surface M1 and the substrate 00 is less than the vertical distance between the second surface M2 and the substrate 00. In this embodiment, a light-shielding layer 30 is provided to at least partially surround the optical sensor 40. The thickness of the light-shielding layer 30 can be appropriately increased, and the light-shielding layer 30 is used as a planarization layer after the fabrication process of the optical sensor 40. Then, the light-shielding layer 30 is etched to form a third opening 31 and a fourth opening 32. The third opening 31 overlaps with the optical sensor 40 in the direction e perpendicular to the plane of the substrate 00, and the fourth opening 32 overlaps with the optical sensor 40 in the direction parallel to the plane of the substrate 00. This embodiment eliminates the need to fabricate a planarization layer between the fabrication process of the light-shielding layer 30 and the fabrication process of the optical sensor 40, which simplifies the process and facilitates the reduction of the overall thickness of the display panel.

[0036] For example, Figure 8This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 8 As shown, the light-emitting device 20 includes a first electrode 21, a light-emitting layer 23, and a second electrode 22. A second opening 12 exposes the first electrode 21. The light-emitting layer 23 is located on the side of the first electrode 21 away from the substrate 00, and the second electrode 22 is located on the side of the light-emitting layer 23 away from the substrate 00. The display panel includes a pixel circuit 61 located on one side of the substrate 00. The first electrode 21 is connected to the pixel circuit 61 through a first via V1. Figure 8 Only one transistor T in the pixel circuit 61 is shown in the diagram. The first electrode 21 is connected to the transistor T through the first via V1. The first via V1 does not overlap with the fourth opening 32 along the direction e perpendicular to the plane of the substrate 00. In this embodiment, the light-shielding layer 30 and the pixel definition layer 10 are fabricated using the same photomask. Therefore, the fourth opening 32 in the light-shielding layer 30 overlaps with the second opening 12 in the pixel definition layer 10, meaning the fourth opening 32 overlaps with the first electrode 21 of the light-emitting device 20. Considering the flatness of the first electrode 21, a first planarization layer 51 is also provided above the light-shielding layer 30. The first planarization layer 51 fills the third opening 31 and the fourth opening 32 of the light-shielding layer 30, providing a relatively flat substrate for the fabrication of the first electrode 21. The first planarization layer 51 is typically made of organic material. The thickness of the first planarization layer 51 is relatively large, and since the first planarization layer 51 fills the fourth opening 32, the thickness of the planarization layer at the location of the fourth opening 32 is even greater. If the first via V1 overlaps with the fourth opening 32, the first via V1 would need to penetrate a planarization layer with a greater thickness, increasing the difficulty of the drilling process and the manufacturing cost. In this embodiment of the invention, the first via V1 overlaps with the fourth opening 32, so the thickness of the organic layer penetrated by the first via V1 is not too large, thereby reducing the difficulty of the drilling process, reducing manufacturing time, and reducing manufacturing costs. Furthermore, by having the first via V1 overlap with the fourth opening 32, the light-emitting layer 23 within the second opening 12 at the position of the light-emitting device 20 does not overlap with the first via V1, improving the planarity of the first electrode 21 and the light-emitting layer 23, and reducing the risk of four-way color shift in the light-emitting device 20.

[0037] For example, such as Figure 8 As shown, the display panel also includes a sensing circuit 62, and the optical sensor 40 is electrically connected to the sensing circuit 62. The sensing circuit 62 is used to transmit the electrical signals sensed by the optical sensor 40. Figure 8 Only one transistor T in the sensing circuit 62 is shown in the diagram. The optical sensor 40 is electrically connected to the transistor in the sensing circuit 62 through the second via V2.

[0038] This invention also provides a display device. Figure 9 This is a schematic diagram of a display device provided in an embodiment of the present invention. Figure 9As shown, the display device includes a display panel 100 provided in any embodiment of the present invention. The structure of the display panel 100 has been described in the above embodiments and will not be repeated here. The display device provided in the embodiments of the present invention can be, for example, an electronic device with display function such as a mobile phone, tablet, computer, television, or smart wearable product.

[0039] 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 within the scope of protection of the present invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, The display panel includes: A substrate, and a pixel definition layer and a light-emitting device located on one side of the substrate; the pixel definition layer includes a first opening and a second opening, and at least a portion of the light-emitting device is located within the second opening; A light-shielding layer is located on the side of the pixel definition layer near the substrate; the light-shielding layer includes a third opening and a fourth opening; along a direction perpendicular to the plane where the substrate is located, the third opening overlaps with the first opening, and the fourth opening overlaps with the second opening; An optical sensor is located on the side of the light-shielding layer close to the substrate; along a direction perpendicular to the plane of the substrate, the optical sensor overlaps with the first opening and the third opening.

2. The display panel according to claim 1, characterized in that, The orthographic projection shape of the first opening on the substrate is the same as the orthographic projection shape of the third opening on the substrate, and the orthographic projection shape of the second opening on the substrate is the same as the orthographic projection shape of the fourth opening on the substrate.

3. The display panel according to claim 1, characterized in that, The projected area of ​​the first opening on the substrate is smaller than the projected area of ​​the second opening on the substrate, and the projected area of ​​the third opening on the substrate is smaller than the projected area of ​​the fourth opening on the substrate.

4. The display panel according to claim 1, characterized in that, The projected area of ​​the third opening on the substrate is smaller than that of the first opening on the substrate, and the projected area of ​​the fourth opening on the substrate is smaller than that of the second opening on the substrate.

5. The display panel according to claim 1, characterized in that, The angle between the inner wall of the first opening and the plane where the substrate is located, pointing towards the interior of the pixel definition layer, is the first slope angle θ1. The angle between the inner wall of the third opening and the plane where the substrate is located, pointing towards the interior of the light-shielding layer, is the second slope angle θ2, where θ2>θ1.

6. The display panel according to claim 1, characterized in that, The material of the pixel definition layer includes black material.

7. The display panel according to claim 6, characterized in that, The material of the light-shielding layer is the same as the material of the pixel definition layer.

8. The display panel according to claim 7, characterized in that, Along a direction perpendicular to the plane of the substrate, the thickness of the light-shielding layer is less than the thickness of the pixel definition layer.

9. The display panel according to claim 1, characterized in that, The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode. A second opening exposes the first electrode. The light-emitting layer is located on the side of the first electrode away from the substrate, and the second electrode is located on the side of the light-emitting layer away from the substrate. The second electrodes of adjacent light-emitting devices are interconnected to form a common electrode layer. At least a portion of the common electrode layer is located within the first opening.

10. The display panel according to claim 1, characterized in that, The display panel includes a first planarization layer, which is located on the side of the pixel definition layer near the light-shielding layer. Wherein, the first planarization layer at least partially fills the third opening and the fourth opening.

11. The display panel according to claim 1, characterized in that, The light-shielding layer at least partially surrounds the optical sensor, the surface of the light-shielding layer near the substrate is a first surface, and the surface of the optical sensor away from the substrate is a second surface; The vertical distance between the first surface and the substrate is less than the vertical distance between the second surface and the substrate.

12. The display panel according to claim 1, characterized in that, The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode. The second opening exposes the first electrode. The light-emitting layer is located on the side of the first electrode away from the substrate, and the second electrode is located on the side of the light-emitting layer away from the substrate. The display panel includes a pixel circuit located on one side of the substrate, and the first electrode is connected to the pixel circuit through a first via. Wherein, along the plane perpendicular to the substrate, the first via does not overlap with the fourth opening.

13. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 12.

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