Display panel, preparation method thereof and display device

Abstract

The application provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, a plurality of light emitting devices, a pixel definition layer and a light absorption unit. The plurality of light emitting devices are arranged on one side of the substrate and located in a display area, and each light emitting device comprises a first electrode. The pixel definition layer is arranged on the side of the substrate close to the light emitting devices, the first orthographic projection of the pixel definition layer on the substrate and the second orthographic projection of the first electrode on the substrate have an overlapping area, and at least part of the pixel definition layer in the first area is a light-transmitting material. The light absorption unit is arranged on the side of the first electrode away from the substrate, and at least part of the light absorption unit is located in the first area, and the third orthographic projection of the light absorption unit on the substrate at least partially overlaps with the overlapping area. The application can reduce the reflectivity while ensuring the transmittance, thereby improving the light reflection problem and improving the user experience effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] With the wide use of electronic display products in people's daily life, users have put forward higher and higher requirements on the display performance of electronic display products.

[0003] However, the display panel in the electronic display product is limited by its own structure or material, etc. Under the condition of external light, it is easy to appear reflection problem, which greatly reduces the display effect of the display panel and seriously affects the user experience effect. SUMMARY

[0004] Therefore, the present application provides a display panel, a preparation method thereof and a display device. In the display panel, part or all of the pixel definition layer is set to a light-transmitting material, and a light-absorbing unit is arranged at the position corresponding to the electrode. The effect of reducing reflectivity while ensuring transmittance is achieved, thereby improving the reflection problem and improving the user experience effect.

[0005] The first aspect of the present application provides a display panel, which is divided into a display area, the display area including a first area, the display panel further including a substrate, a plurality of light emitting devices, a pixel definition layer and a light-absorbing unit. The plurality of light emitting devices are arranged on one side of the substrate and located in the display area, each light emitting device including a first electrode. The pixel definition layer is arranged on the side of the substrate close to the light emitting device, the first orthogonal projection of the pixel definition layer on the substrate and the second orthogonal projection of the first electrode on the substrate having an overlapping area. At least part of the pixel definition layer in the first area is a light-transmitting material. The light-absorbing unit is arranged on the side of the first electrode away from the substrate, and at least part of the light-absorbing unit is located in the first area. The third orthogonal projection of the light-absorbing unit on the substrate at least partially overlaps with the overlapping area.

[0006] In the above scheme, the light-transmitting material of the pixel definition layer ensures the transmittance of the display panel to external light, and the light-absorbing unit absorbs part of the external light incident on the first electrode, reducing the reflection of the display panel to external light. The effect of reducing reflectivity while ensuring transmittance is achieved, thereby improving or avoiding the reflection problem and improving the user experience effect.

[0007] In one specific embodiment of the first aspect of the present application, the third orthogonal projection is located within the overlapping area, or the third orthogonal projection coincides with the overlapping area.

[0008] In the above scheme, the excessive absorption of ambient light by the light-absorbing unit corresponding to the portion beyond the overlapping region can be avoided to reduce the transmittance, thereby further improving the transmittance while reducing the reflectance, and improving the display effect of the display panel.

[0009] In one specific implementation of the first aspect of the present application, the display panel further comprises a plurality of light filtering units corresponding to the plurality of light emitting devices and located on the side of the corresponding light emitting device away from the substrate. The second orthogonal projection is located within the fourth orthogonal projection of the corresponding light filtering unit on the substrate.

[0010] In one specific implementation of the first aspect of the present application, the light-absorbing unit is located between the first electrode and the pixel defining layer.

[0011] In another specific implementation of the first aspect of the present application, each light emitting device further comprises a light emitting functional layer and a second electrode which are sequentially stacked on the first electrode. The display panel further comprises an encapsulation layer. The encapsulation layer is arranged between the light emitting device and the light filtering unit. The light-absorbing unit is located between the second electrode and the encapsulation layer, or the light-absorbing unit is located between the encapsulation layer and the light filtering unit.

[0012] In yet another specific implementation of the first aspect of the present application, each light emitting device further comprises a light emitting functional layer and a second electrode. The light emitting functional layer is located within the pixel opening of the pixel defining layer, and the second electrode is located on the side of the pixel defining layer and the light emitting functional layer away from the substrate. The light-absorbing unit is located between the second electrode and the pixel defining layer, or the light-absorbing unit is located between the second electrode and the light emitting functional layer.

[0013] In one specific implementation of the first aspect of the present application, the third orthogonal projection is located within the fourth orthogonal projection of the corresponding light filtering unit on the substrate.

[0014] In another specific implementation of the first aspect of the present application, the display panel further comprises a light shielding matrix. The light shielding matrix is provided with a plurality of openings. The plurality of light filtering units are arranged one-to-one within the plurality of openings.

[0015] The second aspect of the present application provides a display device comprising the display panel in any one of the specific implementations of the first aspect.

[0016] The third aspect of the present application provides a preparation method of the display panel in any of the embodiments of the first aspect. The display panel is divided into a display area, and the display area includes a first region. The preparation method includes providing a substrate; forming a first electrode on one side of the substrate in the display area; forming a light absorption unit on the side of the first electrode away from the substrate, at least part of the light absorption unit being located in the first region; and forming a pixel definition layer on the side of the substrate close to the light emitting device, at least part of the pixel definition layer in the first region being a light-transmitting material. A first orthogonal projection of the pixel definition layer on the substrate and a second orthogonal projection of the first electrode on the substrate have an overlapping area, and a third orthogonal projection of the light absorption unit on the substrate at least partially overlaps the overlapping area. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 shows a plan view of a display panel according to an embodiment of the present application.

[0018] Figure 2 Fig. 2 shows a plan view of a display panel according to another embodiment of the present application.

[0019] Figure 3 Fig. 3 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to an embodiment of the present application.

[0020] Figure 4 Fig. 4 shows a partial enlarged cross-sectional view along MM' in a display area of a display panel according to an embodiment of the present application.

[0021] Figure 5 Fig. 5 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to another embodiment of the present application.

[0022] Figure 6 Fig. 6 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to another embodiment of the present application.

[0023] Figure 7 Fig. 7 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to another embodiment of the present application.

[0024] Figure 8 Fig. 8 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to another embodiment of the present application.

[0025] Figure 9 Fig. 9 shows a partial enlarged cross-sectional view along MM' in a first region of a display panel according to another embodiment of the present application.

[0026] Figure 10 Fig. 6 shows a partial enlarged sectional view along MM' of a first region of a display panel according to another embodiment of the present application.

[0027] Figure 11 Fig. 7 shows a flowchart of a method for manufacturing a display panel according to an embodiment of the present application.

[0028] Figures 12A to 12E Fig. 8 shows a structural variation diagram corresponding to the method for manufacturing a display panel according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] At present, display panels such as organic light-emitting diode (OLED) based display panels are widely used in electronic display products such as smart phones, tablet computers, smart watches, instrument panels, etc. due to their good flexibility, three-dimensional (3D) modeling, high display ratio, superior visual experience, wide field of view, etc.

[0031] However, when external light such as ambient light is incident on the display panel, due to the presence of structures such as light-reflective electrodes or reflective film layers in the display panel, the external light is extremely easy to produce light reflection and / or diffraction phenomena in the display panel under the condition of external light, thereby making the display panel extremely prone to light reflection problems, thus reducing the display effect of the display panel and also reducing the user experience effect.

[0032] In one method, a polarizer (POL) is arranged in a display panel, the polarizer comprising a polarizing plate and a 1 / 4 wave plate, the polarizing plate causing external light rays to become linearly polarized light in a first direction after being incident into the polarizer, and the linearly polarized light becomes circularly polarized light after passing through the 1 / 4 wave plate, the polarization direction of the circularly polarized light changes (opposite direction, for example, in the case of the original polarization direction being clockwise, the polarization direction after reflection is counterclockwise) after the circularly polarized light is reflected, and then the reflected circularly polarized light becomes linearly polarized light again after passing through the 1 / 4 wave plate, but the polarization direction changes to a second direction perpendicular to the first direction, so it cannot continue to pass through the polarizing plate. Thus, the external light rays cannot be emitted out of the display panel again after passing through the polarizer, thereby achieving the effect of reducing reflection. However, on the one hand, the thickness of the polarizer is relatively thick, for example, about 80 μm, which makes the thickness of the display panel too thick, which is not conducive to the thinning of the display panel. On the other hand, the transmittance of the polarizer for light emitted by the light-emitting device is only about 43%, and when the light emitted by the light-emitting device in the display panel passes through the polarizer, the brightness decreases by more than 50%, thereby seriously reducing the display efficiency of the display panel. In order to ensure the display efficiency of the display panel, the brightness has to be continuously improved, which leads to an increase in power consumption.

[0033] In another method, a color filter (COE) is formed on an organic electroluminescent device of a thin film package. In this COE technology, the POL is replaced by a color filter (CF), and since the transmittance of the color filter for light emitted by the corresponding light-emitting device can reach more than 70%, the power consumption of the screen body can be significantly reduced, for example, by about 37.8%. In addition, a light shielding matrix such as a black matrix (BM) is generally used to separate a plurality of color filters, so that external light rays passing through the light shielding matrix are absorbed by the light shielding matrix, but external light rays passing through the CF part are easily reflected by electrodes or film layers with reflective properties, which significantly increases the reflectivity and causes obvious reflection diffraction problems. Currently, a black pixel defining layer (PDL) is used to reduce reflectivity, but at the same time, the black pixel defining layer also blocks all external light rays except the pixel opening, reducing the transmittance of external light rays, and cannot meet the requirements of high transmittance and low reflectivity in the display panel, such as the under-screen camera area or the fingerprint recognition area.

[0034] In view of the above, at least one embodiment of this application provides a display panel, a method for manufacturing the same, and a display device, which can at least solve the above-mentioned problems. In the display panel, part or all of the pixel defining layer is made of a light-transmitting material. The first orthographic projection of the pixel defining layer on the substrate overlaps with the second orthographic projection of the electrode on the substrate. A light-absorbing unit is provided on the side of the electrode facing away from the substrate. The third orthographic projection of the light-absorbing unit on the substrate at least partially overlaps with the overlapping area. Thus, the light-transmitting pixel defining layer ensures the transmittance of the display panel to external light, and the light-absorbing unit absorbs external light incident on the display panel, reducing the reflection of external light by elements such as the first electrode or a high-reflectivity film layer in the display panel. This achieves the effect of reducing reflectivity while ensuring transmittance, thereby improving the reflection problem and enhancing the user experience.

[0035] The following description, in conjunction with the accompanying drawings, describes a display panel, its fabrication method, and a display device according to at least one embodiment of the present application. Furthermore, in these drawings, a spatial rectangular coordinate system is established with reference to the substrate of the display panel to aid in illustrating the positional relationships of the various structures within the display panel. In this spatial rectangular coordinate system, the X-axis and Y-axis are parallel to the plane containing the display panel, and the Z-axis is perpendicular to the plane containing the display panel. Additionally, in the embodiments of the present application, "length" is defined as a direction parallel to the X-axis; for example, the difference in the straight-line distance between the two farthest endpoints of an object along a direction parallel to the X-axis is the length of the object. "Thickness" is defined with reference to the substrate; for example, for an object located on one side of the substrate, the difference in the vertical distance from the farthest end of the object to the substrate to the substrate and the vertical distance from the closest end of the object to the substrate to the substrate is the thickness of the object.

[0036] like Figures 1 to 10 As shown, the display panel 100 has a display area 10 and a wiring area 20. The display area 10 is used to display images. The wiring area 20 is used for signal lines that apply signals to the display area 10.

[0037] It should be noted that, in addition to the display area 10 and the wiring area 20, the display panel 100 may also have a bonding area or a bending area. The light extraction method of the display panel 100 can be either bottom light extraction or top light extraction. Figure 1 and Figure 2 The division of the display area 10 and the wiring area 20 is merely exemplary and can be adapted to meet actual needs.

[0038] In the display panel provided in at least one embodiment of the present application, the display area 10 of the display panel 100 includes a first area 11, and the display panel 100 includes a substrate 110, a plurality of light emitting devices 120, a pixel definition layer 130, and a light absorption unit 140. The plurality of light emitting devices 120 are arranged on one side of the substrate 110 and located in the display area 10, and each light emitting device 120 includes a first electrode 121. The pixel definition layer 130 is arranged on the side of the substrate 110 close to the light emitting device 120, and the first projection of the pixel definition layer 130 on the substrate 110 and the second projection of the first electrode 121 on the substrate 110 have an overlapping area. At least part of the pixel definition layer 130 located in the first area 11 is of a light-transmitting material. The light absorption unit 140 is arranged on the side of the first electrode 121 away from the substrate 110, and at least part of the light absorption unit 140 is located in the first area 11. The third projection of the light absorption unit 140 on the substrate 110 at least partially overlaps with the overlapping area. In this way, the light-transmitting pixel definition layer can transmit part or all of the external light 1 incident on the pixel definition layer, so as to ensure the transmittance of the display panel. The light absorption unit 140 absorbs the external light 1 incident on the light absorption unit, so that the part of the first electrode 121 overlapping with the third projection of the light absorption unit 140 no longer reflects the external light, and the reflectivity is reduced, thereby achieving the effect of reducing the reflectivity while ensuring the transmittance, and further improving the reflection problem, optimizing the viewing experience, and meeting the user requirements.

[0039] It should be noted that the substrate 110 can be any one of a low-temperature polysilicon (LTPS) substrate and an indium gallium zinc oxide (IGZO) substrate or a combination of the two substrates. The substrate 110 can have a driving circuit for driving the plurality of light emitting devices to emit light of corresponding colors. For example, the substrate 110 can include a substrate layer, a barrier layer (Barrier), a buffer layer (Buffer), a gate insulating layer (GI), a capacitance insulating layer (CI), a gate, a source and drain, an interlayer dielectric layer (ILD), a planarization layer (PLN), etc.

[0040] The plurality of light emitting devices 120 can be a single type of light emitting device, which is a light emitting device capable of emitting a single color of light, such as a light emitting device capable of emitting white light. The plurality of light emitting devices 120 can also be different types of light emitting devices, which are light emitting devices capable of emitting different colors of light, such as any of a plurality of light emitting devices capable of emitting blue light, a light emitting device capable of emitting red light, a light emitting device capable of emitting green light, a light emitting device capable of emitting yellow light, and a light emitting device capable of emitting white light. In some embodiments, the first electrode 121 can be light-reflecting, in which case the light absorbing unit 140 absorbs a portion of the external light rays 1 incident on the first electrode 121, which can reduce the reflection of the external light rays by the first electrode 121. In other embodiments, the first electrode 121 can be light-transmitting, and a reflective film layer can be provided between the substrate 110 and the first electrode 121, in which case the light absorbing unit 140 absorbs a portion of the external light rays 1 incident on the reflective film layer, which can reduce the reflection of the external light rays by the reflective film layer.

[0041] The first electrode 121 has a second orthographic projection on the substrate 110, and the first orthographic projection of the pixel defining layer 130 on the substrate 110 has an overlapping region with the second orthographic projection of the first electrode 121 on the substrate 110. For example, as shown in FIG. 1A, the first electrode 121 is provided on the substrate 110, and the pixel defining layer 130 is provided on the first electrode 121. Figures 3 to 10 For example, the length of the overlapping region on one side of the first electrode 121 is A, which can be 2 μm to 2.5 μm, and the specific value of A can be set according to actual needs. The pixel defining layer 130 can be a single-layer structure or a multi-layer structure. At least part of the pixel defining layer 130 in the first region 11 is a light-transmitting material, which can be an inorganic material such as silicon nitride, silicon oxide, or silicon oxynitride, or an organic material such as polyimide, benzocyclobutene, polyimide, polyamide, acrylic resin, and phenolic resin. The light-transmitting material can be transparent and colorless, or can be light yellow or yellow, as long as it can transmit external light. The composition of the light-transmitting material is not limited in the embodiments of the present application.

[0042] The light absorbing unit 140 is a structure capable of absorbing external light, for example, the light absorbing unit 140 can be an organic material such as black organic glue or black resin, or an inorganic material such as chromium Cr, chromium oxide, or carbon black. The light absorbing unit 140 can be black, gray, or other colors, as long as it can absorb external light. The cross-sectional shape of the light absorbing unit 140 can be a rectangle as shown in FIG. 1B, or a triangle as shown in FIG. 1C, or a trapezoid as shown in FIG. 1D, or a polygon as shown in FIG. 1E, or a circle as shown in FIG. 1F, or an ellipse as shown in FIG. 1G, or a combination thereof. Figures 3 to 5 Figures 8 to 10 Figure 6 Figure 7 ​​​The trapezoid shown can also be set to other shapes such as a square or a triangle according to actual requirements. The number of the light-absorbing units 140 can be one or more, and the light-absorbing units 140 are arranged one by one corresponding to the at least partially first electrodes in the first region. The cross-sectional shapes of the light-absorbing units 140 corresponding to different first electrodes can be the same or different. If the cross-sectional shapes of the light-absorbing units 140 corresponding to different first electrodes are different, it can be designed for different requirements of reflectivity at different positions, or it can be caused by errors such as different hole sizes of a mask or an alignment process in the preparation process. The thickness of the light-absorbing units 140 can range from 150 nm to 200 nm. On the one hand, it can avoid that the light-absorbing units are too thin to be difficult to be formed or the thickness is not easy to be controlled. On the other hand, it can also avoid that the light-absorbing units are too thick to affect the pixel definition layer opening or increase the thickness of the display panel.

[0043] In the display panel provided by the embodiments of the present application, as long as the third orthogonal projection of the light-absorbing unit 140 on the substrate 110 at least partially overlaps the overlapping region, the light-absorbing unit 140 can be used to absorb external light rays that are incident on the part of the first electrode 121 that overlaps the third orthogonal projection of the light-absorbing unit 140 to improve the light reflection phenomenon. On this basis, the overlapping relationship between the third orthogonal projection and the overlapping region can be set according to the actual process requirements, which is not limited herein. In the following embodiments, the overlapping relationship between the third orthogonal projection and the overlapping region is described.

[0044] For example, in some embodiments of the present application, for example, referring to Figure 4 , the third orthogonal projection is located in the overlapping region. In this way, the part of the light-absorbing unit 140 that corresponds to the part outside the overlapping region can be prevented from excessively absorbing external light rays to reduce the transmittance, thereby further improving the transmittance while reducing the reflectivity and improving the display effect of the display panel.

[0045] For another example, in some other embodiments of the present application, for example, referring to Figures 4 to 6 and Figures 8 to 10 , the third orthogonal projection coincides with the overlapping region. In this way, on the one hand, the part of the light-absorbing unit 140 that corresponds to the part outside the overlapping region can be prevented from excessively absorbing external light rays to reduce the transmittance. On the other hand, the light-absorbing unit 140 can absorb external light rays 1 that are incident on the part of the first electrode 121 other than the part exposed by the pixel opening, thereby minimizing the reflection of external light rays by the first electrode 121 or the reflective film layer corresponding to the first electrode 121, and improving the light emission phenomenon caused by the first electrode 121 or the reflective film layer corresponding to the first electrode 121.

[0046] It should be noted that, taking the length as an example, the length of the corresponding overlapping area on the single side of the first electrode 121 is A, and the length of the corresponding light-absorbing unit 140 is B. In the case where the third orthographic projection is located in the overlapping area, A is equal to B.

[0047] For another example, in some other embodiments of the present application, taking an example, referring to Figure 7 , the overlapping area can also be located in the third orthographic projection. Taking the length as an example, A can be less than B. In this way, the light-absorbing unit 140 can absorb external light rays that are incident on the surface of the first electrode other than the surface in contact with the light-emitting functional layer 140, which is conducive to further reducing the reflection of external light rays by the first electrode 121 or the reflective film layer corresponding to the first electrode 121, and improving the light-emitting phenomenon caused by the first electrode 121 or the reflective film layer corresponding to the first electrode 121.

[0048] In the display panel 100 provided by the embodiments of the present application, the pixel defining layer can be made of a light-transmitting material in any area of the display panel, and the specific position of the pixel defining layer made of a light-transmitting material in the display panel can be set according to the actual process requirements, which is not limited herein. In the following embodiments, the specific position of the pixel defining layer made of a light-transmitting material in the display panel is exemplarily illustrated.

[0049] For example, in some embodiments of the present application, taking an example, referring to Figure 1 , Figure 3 , Figure 4 , Figures 5 to 10 , the first area 11 is the display area 10, and all the pixel defining layers 130 are made of a light-transmitting material. In this way, the transmittance of external light rays in the entire display area 10 of the display panel 100 can be improved.

[0050] For another example, in some other embodiments of the present application, taking an example, referring to Figure 2 and Figure 4 , the display area 10 further includes a second area 12, and at least part of the pixel defining layers 130 located in the second area 12 are made of a light-blocking material. In this way, different pixel defining layers can be set according to the requirements of different areas on the display panel, and the cost of improving the entire display area of the display panel can be saved. For example, the at least part of the pixel defining layers located in the areas such as the fingerprint recognition area or the under-screen camera area on the display panel, which have a higher requirement for the transmittance of external light rays, can be set to be made of a light-transmitting material, which is conducive to realizing high transmittance and ensuring the realization of functions such as fingerprint unlocking or photographing in these areas.

[0051] It should be noted that the first area 11 can be one independent area, for example, a fingerprint recognition area or a screen under camera area, etc., or can be multiple independent areas, for example, a fingerprint recognition area and a screen under camera area, etc. The structure of the at least partial pixel defining layer 130 located in the first area 11 can also be referred to as shown in Figure 3 , Figure 4 , Figures 5 to 10 . The cross-sectional shape of the first area 11 can be an ellipse as shown in Figure 2 , or can be a regular or irregular shape such as a circle or a rectangle. The transmittance requirement of the first area 11 to external light can be higher than that of the second area 12 to external light. The position of the first area 11 in the display area 10 can be as shown in Figure 2 , or can be arranged at other positions of the display area as long as it is located in the display area 10. The partial pixel defining layer 130 located in the second area 12 is a light shielding material, which in some embodiments can be a black matrix material such as chromium Cr, chromium oxide or carbon black, and in other embodiments can also include an organic material and a black filler, the organic material including but not limited to polyimide, polymethyl methacrylate and phenolic resin, and the black filler including but not limited to black pigments such as carbon black.

[0052] In the display panel provided in at least one embodiment of the present application, referring to Figure 5 , Figures 7 to 10 , the display panel 100 further comprises a plurality of light filtering units 150. The plurality of light filtering units 150 are arranged corresponding to the plurality of light emitting devices 120 and located on the side of the corresponding light emitting device 120 away from the substrate 110. The second orthogonal projection is located within the fourth orthogonal projection of the corresponding light filtering unit on the substrate 110. In this way, on the one hand, the external light 1 directed to the part of the corresponding light filtering unit 150 beyond the second orthogonal projection can be directly transmitted, and the pixel defining layer 130 of the light transmissive material is thus transmitted, thereby increasing the transmittable area of the display panel and further improving the transmittance of the display panel as a whole to the external light 1, on the other hand, using light filtering units instead of polarizing sheets is also conducive to the thinning of the display panel and improves the display efficiency of the display panel.

[0053] It should be noted that the second orthogonal projection is located within the fourth orthogonal projection of the corresponding light filtering unit 150 on the substrate 110, for example, in terms of length, the length C of the light filtering unit 150 is greater than the length D of the first electrode. The light filtering unit 150 can also be referred to as a light filtering sheet.

[0054] In at least one embodiment of the present application, the third orthographic projection is located within a fourth orthographic projection of the corresponding light filtering unit 150 on the substrate 110. For example, the length C of the light filtering unit 150 is greater than the length B of the light absorbing unit 140. In this way, in the area where the third orthographic projection and the fourth orthographic projection do not overlap and do not pass through the reflective electrode or the reflective film layer, the external light 1 can pass through the light filtering unit 150 and the pixel defining layer 130 of the light-transmitting material, which is conducive to increasing the light-transmitting area and improving the light transmittance of the display panel.

[0055] In the display panel provided in at least one embodiment of the present application, referring to Figures 7 to 10 , the display panel 100 can further include a light shielding matrix 170 having a plurality of openings. The plurality of light filtering units 150 are arranged one by one in the plurality of openings. In this way, the light shielding matrix 170 can absorb external light incident in other areas except the light filtering units 150. In the display panel 100 provided in the embodiments of the present application, the specific position of the light absorbing unit 140 in the display panel 100 can be set according to the actual process needs, which is not limited herein. In the following embodiments, the specific position of the light absorbing unit 140 in the display panel 100 is exemplarily illustrated.

[0056] For example, in some embodiments of the present application, referring to Figures 3 to 5 , Figure 7 , the light absorbing unit 140 is located between the first electrode 121 and the pixel defining layer 130. In this way, on the one hand, the light absorbing unit 140 is located in the corresponding thickness range of the pixel defining layer 130, so that the setting of the light absorbing unit 140 does not increase the total thickness of the display panel, which is conducive to the thinning of the display panel. On the other hand, during the preparation of the display panel, only the preparation of the light absorbing unit 140 needs to be additionally added on the first electrode 121, without changing other preparation processes of the display panel, so that the structure of the light absorbing unit 140 is controllable, the scheme is flexible, and the means is simple.

[0057] In the display panel provided in at least one embodiment of the present application, referring to Figures 7 to 10 , each light emitting device 120 further includes a light emitting functional layer 122 and a second electrode 123 which are sequentially stacked on the first electrode 121. The light emitting functional layer 122 is located in the pixel opening of the pixel defining layer 130. The second electrode 123 is located on the side of the pixel defining layer 130 and the light emitting functional layer 122 away from the substrate 110. Further, the display panel 100 further includes an encapsulation layer 160. The encapsulation layer 160 is arranged between the light emitting device 120 and the light filtering unit 150.

[0058] It should be noted that the light-emitting functional layer 122 can include a light-emitting layer, and further, the light-emitting functional layer 122 can also include any one or more of a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, an electron blocking layer, and a hole blocking layer. The plurality of light-emitting devices 120 can share the same second electrode, or the second electrodes between any two adjacent light-emitting devices can be spaced apart by the pixel defining layer.

[0059] One of the first electrode 121 and the second electrode 123 is an anode, and the other is a cathode. The first electrode 121 and the second electrode 123 can both be electrodes with light transmission, or the second electrode 123 can be an electrode with light transmission, and the first electrode can be an electrode with light reflection. For example, if the first electrode 121 is an anode and has light reflection, the material of the anode can include indium tin oxides (ITO) and silver (Ag), and further, for example, the anode can be composed of ITO-Ag-ITO, the thickness of ITO can range from 5 nm to 15 nm, for example, 10 nm, and the thickness of Ag can range from 50 nm to 150 nm, for example, 100 nm.

[0060] It should also be noted that the light-emitting functional layer 122 is located in the pixel opening of the pixel defining layer 130, and all film layers in the light-emitting functional layer 122 can be located in the pixel opening of the pixel defining layer 130, or part of the film layers in the light-emitting functional layer 122, such as the light-emitting layer, can be located in the pixel opening of the pixel defining layer 130, and the other part of the film layers can be located not only in the pixel opening of the pixel defining layer 130 but also on the side of the pixel defining layer 130 away from the substrate 110. The cross-sectional shape of the pixel opening can be a rectangle as shown in Figures 3 to 7 Figure 9 Figure 10 Figure 7 Figure 8

[0061] For example, in some embodiments of the present application, for example, referring to Figure 6 The light-absorbing unit 140 is located between the second electrode 123 and the pixel defining layer 130. In this way, the external light 1 can be absorbed by the light-absorbing unit 140 before it enters the pixel defining layer 130, reducing the incidence path of the external light 1 in the display panel, and avoiding the reflection of the external light 1 by the first electrode or the reflective film layer at the corresponding position of the light-absorbing unit 140, reducing the reflection and diffraction of the external light 1 in the display panel.

[0062] For example, in some embodiments of the present application, for example, referring to​​​​​Figure 8 The light-absorbing unit 140 is located between the second electrode 123 and the light-emitting functional layer 122. In this way, the external light 1 can be absorbed by the light-absorbing unit 140 before being incident on the light-emitting functional layer 122, and the external light 1 is prevented from being reflected by the first electrode or the reflective film layer at the corresponding position of the light-absorbing unit 140, thereby reducing the reflection and diffraction of the external light 1 in the display panel.

[0063] For example, in some embodiments of the present application, for example, referring to Figure 9 The light-absorbing unit 140 is located between the second electrode 123 and the encapsulation layer 160. In this way, on the one hand, the light-absorbing unit 140 is in the same thickness range as the encapsulation layer 160, so that the light-absorbing unit 140 does not increase the total thickness of the display panel, thereby facilitating the thinning of the display panel. On the other hand, during the preparation of the display panel, only the preparation of the light-absorbing unit 140 needs to be additionally prepared on the second electrode 123, without changing other preparation processes of the display panel, so that the structure of the light-absorbing unit 140 is controllable, the scheme is flexible, and the means is simple.

[0064] For example, in some embodiments of the present application, for example, referring to Figure 10 The light-absorbing unit 140 is located between the encapsulation layer 160 and the light-filtering unit 150. In this way, the external light 1 can be absorbed by the light-absorbing unit 140 before being incident on the encapsulation layer 160, thereby further reducing the incident path of the external light 1 in the display panel, and reducing the reflection and diffraction of the external light 1 in the display panel.

[0065] It should be noted that, in some embodiments, referring to Figures 3 to 7 and Figure 9 The light-absorbing unit 140 can be embedded in a film layer such as the second electrode 123, the pixel definition layer 130, or the encapsulation layer 160, and different light-absorbing units 140 are spaced apart by a film layer such as the second electrode 123, the pixel definition layer 130, or the encapsulation layer 160, thereby not increasing the total thickness of the display panel. In some other embodiments, referring to Figure 8 and Figure 10 The light-absorbing unit 140 can also be independently arranged in a film layer, and different light-absorbing units 140 can be filled and planarized by a planarization layer, so that the film layer in which the light-absorbing unit 140 is located can be closely connected to the adjacent other film layers.

[0066] At least one embodiment of the present application also provides a display device, which includes the display panel in any of the above embodiments, such as the display panel in the embodiment based on Figures 1 to 10 .

[0067] It should be understood that the display panel in the display device can also be based on Figures 1 to 10The display panel of any one of the embodiments shown can be replaced equivalently or obviously modified. The display device can be various electronic display products, and can specifically include but is not limited to at least one of a mobile phone, a tablet computer, an e-book reader, a player, a digital camera, a laptop computer, a vehicle-mounted computer, a desktop computer, a set-top box, a smart television, and a wearable device. In addition, according to actual needs, the display device can further include other structures such as a touch layer, for example, can be prepared by using a manufacturing process of a touch structure directly on an encapsulation layer of the display panel (i.e., a Touch On Encapsulation layer, TOE process).

[0068] Since the display device of the embodiments of the present application includes the above Figures 1 to 10 All the technical solutions of the embodiments shown can at least achieve the above technical effects, which will not be repeated here.

[0069] At least one embodiment of the present application further provides a preparation method of a display panel. The display panel is divided into a display area 10, and the display area 10 includes a first area 11. Referring to Figure 11 and Figures 12A to 12E The preparation method includes the following steps.

[0070] S110: providing a substrate.

[0071] For example, the structure of the substrate 110 is shown in Figure 12A .

[0072] S120: forming a first electrode on one side of the substrate in the display area.

[0073] For example, referring to Figure 12B , a mask exposure and development technology can be used to deposit a material of the first electrode 121 on one side of the substrate 110 in the display area 10 to form the first electrode 121.

[0074] S130: forming a light-absorbing unit on the side of the first electrode away from the substrate, and at least part of the light-absorbing unit is located in the first area.

[0075] For example, referring to Figure 12C , a layer of material of the light-absorbing unit 140 can be coated on the side of the first electrode 121 away from the substrate 110, and further referring to Figure 12D , a mask exposure and development technology is used to remove the excess material of the light-absorbing unit 140, thereby forming the light-absorbing unit 140.

[0076] S140: forming a pixel defining layer on the side of the substrate close to the light emitting device, at least part of the pixel defining layer in the first region is of a light-transmissive material, the first orthographic projection of the pixel defining layer on the substrate and the second orthographic projection of the first electrode on the substrate have an overlapping region, and the third orthographic projection of the light absorbing unit on the substrate at least partially overlaps with the overlapping region.

[0077] For example, referring to Figure 12E A layer of material of the pixel defining layer 130 can be deposited or coated on one side of the substrate 110, and further, the excess material of the pixel defining layer 130 can be removed by a mask exposure and development technology, thereby forming at least part of the pixel defining layer 130 in the first region 11.

[0078] It should be noted that the display panel can be any one of the display panels in the above embodiments, or a display panel obtained by equivalent replacement or obvious modification of any one of the above display panels.

[0079] Since the preparation method is the preparation method of the display panel of the above Figures 1 to 10 embodiments, all the technical solutions of the above Figures 1 to 10 embodiments are included, therefore the specific embodiments of the preparation method can refer to the description in the above display panel related embodiments, and at least can achieve all the above technical effects, which will not be repeated here.

[0080] It should be noted that the combination of the technical features in the present application is not limited to the combination in the claims of the present application or the combination in the embodiments of the present application, and all the technical features in the present application can be freely combined or combined in any manner, unless contradictory.

[0081] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display panel, divided with a display area, the display area comprising a first area, the first area being a fingerprint recognition area and / or an under-screen camera area, characterized in that, The display panel comprises: a substrate; a plurality of light-emitting devices arranged on one side of the substrate and located in the display area, each of the light-emitting devices comprising a first electrode; a pixel definition layer arranged on the side of the substrate close to the light-emitting devices, a first orthogonal projection of the pixel definition layer on the substrate and a second orthogonal projection of the first electrode on the substrate having an overlapping area, at least part of the pixel definition layer in the first area being a light-transmitting material; a light-absorbing unit arranged on the side of the first electrode away from the substrate, and at least part of the light-absorbing unit being located in the first area, a third orthogonal projection of the light-absorbing unit on the substrate at least partially overlapping with the overlapping area; the light-absorbing unit is arranged one-to-one with at least part of the first electrode in the first area, the cross-sectional shape of the light-absorbing unit corresponding to different first electrodes is different, and the thickness of the light-absorbing unit ranges from 150 nm to 200 nm; a plurality of light-filtering units arranged corresponding to the plurality of light-emitting devices and located on the side of the corresponding light-emitting devices away from the substrate; wherein the second orthogonal projection is located within a fourth orthogonal projection of the corresponding light-filtering unit on the substrate; the third orthogonal projection is located within the fourth orthogonal projection of the corresponding light-filtering unit on the substrate; the length of the corresponding overlapping area on one side of the first electrode is A, the length of the light-absorbing unit at the corresponding position is B, A is equal to B; the length of the light-filtering unit is C, the length of the first electrode is D, C is greater than D; the light-absorbing unit is located in the pixel definition layer, and the light-absorbing unit comprises two edges arranged oppositely, one of which coincides with the edge of the pixel opening of the pixel definition layer, and the other of which coincides with the edge of the first electrode located in the pixel definition layer.

2. The display panel according to claim 1, wherein: the third orthogonal projection is located in the overlapping area; or the third orthogonal projection coincides with the overlapping area.

3. The display panel of claim 1, wherein, Each of the light-emitting devices further comprises a light-emitting functional layer and a second electrode arranged in sequence on the first electrode, and the display panel further comprises: an encapsulation layer arranged between the light-emitting devices and the light-filtering units.

4. The display panel of claim 1, wherein, Each of the light-emitting devices further comprises a light-emitting functional layer and a second electrode, the light-emitting functional layer being located in the pixel opening of the pixel definition layer, and the second electrode being located on the side of the pixel definition layer and the light-emitting functional layer away from the substrate.

5. The display panel according to claim 1, wherein: the display panel further comprises a light-shielding matrix, the light-shielding matrix being provided with a plurality of openings, and a plurality of light-filtering units being arranged one-to-one in the plurality of openings.

6. A display device, characterized by comprising: The display panel comprises any one of claims 1-5.

7. A method for manufacturing a display panel as claimed in any one of claims 1 to 5, the display panel being divided into a display area, the display area comprising a first area, characterized in that, The display panel comprises: providing a substrate; forming a first electrode on one side of the substrate in the display area; forming a light-absorbing unit on the side of the first electrode away from the substrate, at least part of the light-absorbing unit being located in the first area; A pixel defining layer is formed on a side of the substrate close to the light emitting device, at least part of the pixel defining layer in the first region is of a light-transmitting material, a first orthographic projection of the pixel defining layer on the substrate and a second orthographic projection of the first electrode on the substrate have an overlapping region, a third orthographic projection of the light absorbing unit on the substrate at least partially overlaps with the overlapping region.

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