Display panel, manufacturing method thereof, and display device

Abstract

The present invention discloses a display panel, a method for manufacturing the same, and a display device. The display panel of one embodiment of the present invention includes pixel units arranged in an array on a substrate and a pixel defining layer separating the pixel units. The display panel includes a front side serving as a light-emitting side and an opposite back side. The display panel also includes a first photoluminescent layer formed on the side of the pixel defining layer near the front side, with the orthographic projection of the surface of the pixel defining layer near the front side on the substrate overlapping the orthographic projection of the first photoluminescent layer on the substrate. The first photoluminescent layer converts received invisible light into visible light for output. The display panel provided by the present invention converts invisible light into visible light for output by disposing the photoluminescent layer on the light-emitting side of the pixel defining layer near the display panel. This allows the display panel to utilize both invisible light from the external environment and invisible light generated by the pixel units to increase the color gamut of the display panel and reduce power consumption, thus having broad application prospects.

Description

Technical Field

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

[0002] Organic Light Emitting Diodes (OLEDs) are active light-emitting display devices with advantages such as self-luminescence, wide viewing angles, high contrast, low power consumption, and extremely high response speed. With the continuous development of display technology, OLED technology is increasingly being used in various flexible and non-flexible display devices.

[0003] Color-on-Encapsulation (COE) technology, one of the solutions for OLED display panels, uses a black matrix (BM) and color filter (CF) as an anti-reflection layer to reduce the reflection of ambient light from reflective metal. Compared to circular polarizers, this technology offers higher transmittance and can reduce the power consumption of OLED products. However, with the increasing demand for lower power consumption in electronic devices, there is a need for products that can further reduce the power consumption of display panels. Summary of the Invention

[0004] To address at least one of the aforementioned problems, the present invention provides, in a first aspect, a display panel comprising a plurality of pixel units arranged in an array on a substrate and a pixel defining layer separating the pixel units. The display panel comprises a front surface serving as a light-emitting side and an opposite back surface, and further comprises:

[0005] A first photoluminescent layer is formed on the side of the pixel defining layer close to the front surface. The orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate. The first photoluminescent layer converts the invisible light it receives into visible light for emission.

[0006] In some optional embodiments, the first photoluminescent layer is disposed on a side of the pixel defining layer away from the substrate, and the display panel further comprises:

[0007] The color filter layer is formed on the side of the first photoluminescent layer away from the substrate, and includes color filters of different colors and a black matrix arranged between the color filters of different colors.

[0008] In some optional embodiments, the pixel unit includes: an organic light-emitting layer defined by a pixel defining layer,

[0009] The pixel definition layer includes: a surface close to the front surface and a sidewall surrounding the surface.

[0010] The display panel further includes a transparent electrode layer formed between the pixel defining layer and the first photoluminescent layer, the transparent electrode layer including a first sub-portion covering the organic light-emitting layer and a second sub-portion covering the surface and exposed sidewalls of the pixel defining layer.

[0011] The first photoluminescent layer covers only a portion of the second sub-portion corresponding to the surface or covers the second sub-portion.

[0012] In some optional embodiments, the black matrix and the pixel defining layer are provided correspondingly, and the display panel further includes:

[0013] an encapsulation layer formed between the first photoluminescent layer and the color filter layer;

[0014] A plurality of grooves are formed on a side of the encapsulation layer away from the first photoluminescent layer, wherein the orthographic projection of the black matrix on the substrate covers the orthographic projection of the grooves on the substrate;

[0015] A second photoluminescent layer is formed in the groove to convert invisible light received by the second photoluminescent layer into visible light for emission.

[0016] In some optional embodiments, the color filter layer further includes a third photoluminescent layer covering the sidewalls of the black matrix, so as to convert the invisible light received by the third photoluminescent layer into visible light for emission.

[0017] In some optional embodiments, the material of the first photoluminescent layer is an acrylate resin containing a benzene ring or a polyurethane resin containing a benzene ring.

[0018] In some optional embodiments, the method further includes:

[0019] The integrated touch layer arranged on a side of the first photoluminescent layer close to the color filter layer includes a plurality of touch sensors.

[0020] A second aspect of the present invention provides a display device comprising the display panel described above.

[0021] A third aspect of the present invention provides a method for manufacturing the display panel described in the first aspect above, wherein the display panel includes a front surface serving as a light-emitting side and an opposite back surface, the method comprising:

[0022] A plurality of pixel units arranged in an array and a pixel defining layer separating the pixel units are formed on a substrate.

[0023] A first photoluminescent layer is formed on the side of the pixel defining layer close to the front surface. The orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate. The first photoluminescent layer converts the invisible light it receives into visible light for emission.

[0024] In some optional embodiments, the first photoluminescent layer is disposed on a side of the pixel defining layer away from the substrate. After the first photoluminescent layer is formed on a side of the pixel defining layer close to the front surface, the method further includes:

[0025] forming an encapsulation layer on the first photoluminescent layer to cover the first photoluminescent layer and the pixel unit;

[0026] forming a plurality of grooves on a side of the encapsulation layer away from the substrate, wherein the orthographic projection of each groove on the substrate covers the orthographic projection of each black matrix on the substrate; and

[0027] forming a second photoluminescent layer in the groove;

[0028] A color filter layer is formed, which includes color filters of different colors and a black matrix arranged between the color filters of different colors. The orthographic projection of the black matrix on the substrate covers the orthographic projection of the second photoluminescent layer on the substrate.

[0029] The beneficial effects of the present invention are as follows:

[0030] In response to the current existing problems, the present invention develops a display panel, a manufacturing method thereof, and a display device. By providing a first photoluminescent layer arranged on the light-emitting side of the pixel defining layer close to the display panel, invisible light is converted into visible light for emission. In this way, the invisible light incident on the display panel from the external environment and the invisible light generated when the pixel unit emits light can be utilized to increase the light-emitting color gamut of the display panel, thereby reducing the power consumption of the display panel. Moreover, based on the existing process, the process difficulty is not significantly increased, the manufacturing cost is low, and the display device has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic cross-sectional view showing a display panel of the prior art;

[0033] Figure 2 A schematic cross-sectional view of a display panel according to an embodiment of the present invention is shown;

[0034] Figure 3 A schematic cross-sectional view showing a display panel according to another embodiment of the present invention;

[0035] Figure 4 A schematic cross-sectional view showing a display panel according to another embodiment of the present invention;

[0036] Figure 5 A schematic cross-sectional view showing a display panel according to another embodiment of the present invention;

[0037] Figure 6 A schematic cross-sectional view showing a display panel according to another embodiment of the present invention;

[0038] Figure 7 a schematic cross-sectional view showing a display panel according to another embodiment of the invention; and

[0039] Figure 8 A flow chart showing a method for manufacturing a display panel according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same or similar reference numerals. It should be understood by those skilled in the art that the following detailed description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0041] It should be noted that the terms "having," "including," and "comprising" described in the present invention are open-ended. That is, when describing a module as "having," "including," or "comprising" a first element, a second element, and / or a third element, it means that the module includes other elements in addition to the first element, the second element, and / or the third element. Furthermore, ordinal numbers such as "first," "second," and "third" in the present invention are not intended to limit a specific order but are merely used to distinguish between components.

[0042] The terms “on…”, “formed on…” and “disposed on…” used in the present invention may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0043] In the present invention, unless otherwise specified, the term "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The term "single patterning process" refers to a process in which a single mask is used to form patterned layers, components, members, etc. In the present invention, when describing layer A and layer B as being "co-disposed," it means that layer A and layer B are fabricated using the same materials and process.

[0044] The inventors have found that in the prior art, in order to meet the low power consumption requirements of display products, COE technology is used to replace polarizers to improve light transmittance. Figure 1As shown, the specific principle is as follows: the display panel includes a plurality of pixel units formed on a substrate and a pixel definition layer separating each pixel unit. The display unit is a top-emitting device, and includes a color filter layer made on the encapsulation layer on the light-emitting side. The color filter layer includes a black matrix corresponding to the pixel definition layer and a color filter corresponding to each pixel unit. Compared with the circular polarizer's elimination effect on natural light, the black matrix and the color filter have a light-absorbing function. When exposed to external natural light, the natural light will pass through the color filter to the pixel unit below it. After being reflected by the pixel unit, the natural light is emitted from the color filter together with the light generated by the pixel unit itself, thereby increasing the light output rate of the natural light and achieving the function of reducing power consumption. However, the inventors found in combination with the above research that the current methods for improving the light output rate of the display panel and reducing power consumption only focus on how to utilize visible light, without considering and utilizing the invisible light in the environment.

[0045] An embodiment of the present invention provides a display panel, comprising a plurality of pixel units arranged in an array on a substrate and a pixel defining layer separating the pixel units. The display panel includes a front surface serving as a light-emitting side and an opposite back surface, and further comprises:

[0046] The first photoluminescent layer is formed on the side of the pixel defining layer close to the front surface. The orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate. The first photoluminescent layer converts the invisible light it receives into visible light for output.

[0047] In this embodiment, a first photoluminescent layer is provided on the light-emitting side of the pixel defining layer close to the display panel to convert invisible light with a wavelength less than 390 nm into visible light with a wavelength greater than 390 nm for emission. This allows the invisible light from the external environment incident on the display panel and the invisible light generated when the pixel unit emits light to increase the light-emitting color gamut of the display panel, thereby reducing the power consumption of the display panel. Moreover, based on the existing process, the process difficulty is not significantly increased, the production cost is low, and it has broad application prospects.

[0048] In a specific embodiment, referring to Figure 2 As shown, the display panel includes a plurality of pixel units 210 arranged in an array on a substrate 100 and a pixel defining layer 220 separating the pixel units 210. The pixel units 210 include an organic light-emitting layer 213. The organic light-emitting layer 213 of each pixel unit 210 can emit visible light of different colors (e.g., red, blue, and green) under the control of voltages applied by electrodes on both sides thereof.

[0049] The display panel includes a front surface (arrows indicate the direction of light emission) and an opposite back surface. The electrodes on either side of the organic light-emitting layer are transparent electrodes near the front surface of the display panel, and reflective electrodes farther from the front surface. The transparent electrode can be either a cathode or an anode, and the reflective electrode can be either an anode or a cathode.

[0050] Materials forming transparent electrodes include, but are not limited to, ITO (indium tin oxide), and materials forming reflective electrodes include, but are not limited to, metals or alloys. Transparent electrodes are not limited to 100% transparency; within the scope of this application, any electrode that can meet the requirements for emitting natural light is protected as a transparent electrode.

[0051] In this example, the front side of the display panel is on the side of the pixel-defining layer 220 away from the substrate 100. That is, each pixel unit 210 is a top-emitting device, emitting light from the top of the device. Therefore, in this example, each pixel unit 210 includes a reflective electrode 211 on the side of the substrate 100 opposite the organic light-emitting layer 213, and a transparent electrode 215 on the side of the organic light-emitting layer 213 away from the substrate 100.

[0052] Specifically, continue to refer to Figure 2 As shown, a thin film transistor for controlling the light emission of the pixel unit 210 is further included between the substrate 100 and the pixel unit 210. The thin film transistor may include an active layer 302, a gate insulating layer 303, a gate 304, and a source and drain electrode 306 stacked on the substrate 100. A dielectric layer 305 may be included between the gate 304 and the source and drain electrode 306. The material of the dielectric layer 305 may be one or more layers of insulating material such as silicon oxide or silicon nitride to electrically isolate the gate 304 from the source and drain electrode 306. A buffer layer 301 may also be included between the thin film transistor and the substrate 100. The buffer layer 301 may also be one or more layers of insulating material such as silicon oxide or silicon nitride. The buffer layer 301, the active layer 302, the gate insulating layer 303, the gate 304, the dielectric layer 305, and the source and drain electrode 306 together constitute the driving circuit layer 300. Of course, the figure shows a top-gate thin film transistor by way of example, but the present application is not intended to limit the type of thin film transistor. Those skilled in the art should understand that when the thin film transistor is a bottom-gate structure, only the relative position relationship between the active layer and the gate is adjusted, which will not be elaborated here.

[0053] Continue to refer to Figure 2 As shown, a planarization layer 400 is further provided on the driving circuit layer 300 , and the planarization layer can also directly serve as an inorganic protection layer for the source and drain electrodes 306 . The reflective electrode 211 is electrically connected to the source or drain electrode via a via hole provided in the planarization layer 400 .

[0054] In particular, refer to Figure 2As shown, in an embodiment of the present application, the display panel further includes a first photoluminescent layer 510, which is formed on the front side of the pixel defining layer 220 close to the display panel. The orthographic projection of the surface of the pixel defining layer 220 close to the front side of the display panel covers the orthographic projection of the first photoluminescent layer 510 on the substrate. The first photoluminescent layer 510 converts the received invisible light into visible light for output.

[0055] Optionally, the material of the first photoluminescent layer 510 can convert incident invisible light into visible light, such as an acrylic resin containing benzene rings or a polyurethane resin containing benzene rings. Of course, other materials capable of converting invisible light into visible light are also acceptable and are not specifically limited in this application. The first photoluminescent layer absorbs photons in a wavelength band invisible to the human eye, generating energy that excites and causes luminescence, thereby re-radiating photons in a wavelength band visible to the human eye. The absorbed invisible photons include ultraviolet light and infrared light.

[0056] The above arrangement is such that a first photoluminescent layer is arranged on the front side of the pixel defining layer close to the display panel, and the coverage range of the first photoluminescent layer does not affect the light-emitting range of the pixel unit defined by the pixel defining layer. The invisible light received by the first photoluminescent layer is converted into visible light that can be perceived by the human eye and emitted. The visible light toward the pixel unit can be reflected by the reflective electrode of the pixel unit and then emitted toward the light-emitting side of the display panel. The visible light toward the light-emitting side can be directly emitted from the light-emitting side of the display panel, thereby effectively utilizing the invisible light in the environment to increase the light-emitting rate of the display panel, improve the color gamut of the display panel, and effectively reduce the power consumption of the display panel.

[0057] It should be noted that if Figure 2 As shown, a display panel with a top-emitting device has a light-emitting side on the side of the pixel defining layer 220 away from the substrate, and the thin-film transistor driving the pixel unit 210 is set on the side of the pixel unit away from the light-emitting side. Compared with the top-emitting device, the pixel resolution can be increased. Therefore, the top-emitting device is currently more widely used. This application also uses the display panel composed of the top-emitting device as an example for illustration. However, this application is not intended to be limited to this. The display panel composed of the bottom-emitting device can also apply the technical solution of this application. Those skilled in the art can understand that it is only necessary to set the first photoluminescent layer on the side of the pixel defining layer close to the front of the display panel based on the existing process similar to the top-emitting device, and to meet the requirement that the positive projection of the surface of the pixel defining layer close to the front on the substrate covers the positive projection of the first photoluminescent layer on the substrate. It can also achieve the effect of effectively utilizing the invisible light in the environment to increase the light output rate of the display panel, improve the color gamut of the display panel, and effectively reduce the power consumption of the display panel. At this time, the other layer structures of the display panel are also adaptively adjusted according to the layer structure layout of the bottom-emitting structure, which will not be repeated below.

[0058] Continue to refer to Figure 2 As shown, the filter layer of the display panel can be a color filter layer 600 formed using COE technology. The color filter layer 600 is formed on the side of the first photoluminescent layer 510 away from the substrate 100 and includes color filters 610 of different colors and a black matrix 620 disposed between the color filters 610 of different colors. Those skilled in the art will appreciate that the color of each color filter 610 corresponds to the color of each pixel unit thereunder. Of course, an encapsulation layer 700 is also included between the color filter layer 600 and the first photoluminescent layer 510.

[0059] By directly fabricating the color filter on the encapsulation layer 700, the color filter layer 600 can be significantly thinner than a polarizer, achieving greater flexibility, which is more advantageous in flexible display devices. Furthermore, unlike the circular polarizer's ability to eliminate natural light, the color filter layer's black matrix and color filter have a light-absorbing function. When exposed to natural light, the natural light passes through the color filter and reaches the underlying pixel units. After being reflected by the pixel units, the natural light is emitted from the color filter together with the light generated by the pixel units themselves, increasing the light extraction rate of the natural light and thus reducing power consumption.

[0060] It is worth noting that in the present application, the first photoluminescent layer can simultaneously receive the invisible light transmitted from the color filter layer and the invisible light reflected from the pixel unit to the first photoluminescent layer, and convert the invisible light to be directly emitted from the color filter layer, or further reflected from the pixel unit and then emitted from the color filter layer, thereby improving the luminous efficiency of the display panel and significantly improving the display color gamut of the display panel, and has broad application prospects.

[0061] More specifically, refer to Figure 2 and Figure 3 As shown, the pixel defining layer 220 includes: a surface close to the front surface and sidewalls surrounding the surface. Typically, if the reflective electrode 211 is an independent electrode corresponding to the organic light-emitting layer of each pixel unit 210, to simplify the process, the transparent electrode can be a material layer that covers the entire pixel defining layer and the organic light-emitting layer. In this case, the display panel also includes: a transparent electrode layer 215 formed between the pixel defining layer 220 and the first photoluminescent layer 510. The transparent electrode layer 215 includes a first sub-portion that covers the organic light-emitting layer 213, and a second sub-portion that covers the surface of the pixel defining layer 220 and the exposed sidewalls.

[0062] The first photoluminescent layer 510 may be Figure 2 As shown, only the portion of the second sub-portion corresponding to the surface of the pixel defining layer 220 close to the front of the display panel is covered, or it can be as shown in FIG. Figure 3 The entire second subsection is shown covered.

[0063] When the first photoluminescent layer 510 covers the second sub-portion, the light receiving area for receiving invisible light can be increased, thereby further improving the utilization rate of invisible light in the environment and the conversion rate to visible light, thereby further improving the light extraction rate of the display panel and further reducing the power consumption of the display panel.

[0064] Of course, it should be noted that the first photoluminescent layer is not intended to be limited to being disposed on the transparent electrode layer. In other words, in some display panels, the transparent electrode is patterned so as to be formed only in the area defined by the pixel defining layer. In this case, the first photoluminescent layer is directly formed on the surface of the pixel defining layer close to the front side of the display panel, which will not be elaborated here.

[0065] In some optional embodiments, referring to Figure 4 and Figure 5 As shown, the display panel further includes: a plurality of grooves formed on a side of the encapsulation layer 600 away from the first photoluminescent layer 510; the orthographic projection of the black matrix 620 on the substrate 100 overlaps the orthographic projection of the grooves on the substrate 100; and a second photoluminescent layer 520 formed in the grooves to convert invisible light received by the second photoluminescent layer 520 into visible light for emission. The black matrix 620 is disposed corresponding to the pixel defining layer 610. The material of the second photoluminescent layer 520 can be the same as or different from that of the first photoluminescent layer; for example, it can be an acrylate resin containing a benzene ring, a polyurethane resin containing a benzene ring, or other materials capable of converting invisible light into visible light.

[0066] Of course, the first photoluminescent layer 510 may be Figure 4 As shown, only the portion of the second sub-portion corresponding to the pixel defining layer 220 is covered. Figure 5 The second subsection is shown covered.

[0067] The above arrangement, by providing a second photoluminescent layer 520 in the groove below the black matrix corresponding to the pixel defining layer, the second photoluminescent layer is provided on the side of the encapsulation layer away from the substrate relative to the first photoluminescent layer, so that invisible light reflected by the pixel unit but not received by the first photoluminescent layer can be further received by the second photoluminescent layer and converted into visible light for emission. The emitted visible light is further reflected from the pixel light-emitting unit and then emitted from the color filter layer, thereby improving the utilization rate of invisible light in the environment and the conversion rate to visible light, thereby further improving the light extraction rate of the display panel and further reducing the power consumption of the display panel.

[0068] Optionally, refer to Figure 6As shown, the color filter layer 600 further includes a third photoluminescent layer 530 covering the sidewalls of the black matrix 620 to convert invisible light received by the third photoluminescent layer into visible light for emission. The material of the third photoluminescent layer 520 can be the same as or different from that of the first photoluminescent layer. For example, the third photoluminescent layer 520 can be an acrylate resin containing a benzene ring, a polyurethane resin containing a benzene ring, or other materials capable of converting invisible light into visible light.

[0069] Through this arrangement, by coating the side walls of the black matrix with the third photoluminescent layer, invisible light directed toward the side walls of the black matrix can be utilized, and this invisible light is converted into visible light and emitted from the color filter to the display panel, thereby improving the color gamut of the display panel, improving the utilization rate of invisible light in the environment and the conversion rate to visible light, thereby further improving the light output rate of the display panel and further reducing the power consumption of the display panel.

[0070] It is worth mentioning that the display panel can also have a touch function. For these display panels, Figure 7 As shown, the display panel further includes an integrated touch layer 800 disposed on a side of the first photoluminescent layer close to the color filter layer, including a plurality of touch sensors for sensing a user's touch selection of the display panel, which will not be described in detail here.

[0071] Accordingly, refer to Figure 8 As shown, an embodiment of the present invention further provides a method for manufacturing the display panel described in the above embodiment, wherein the display panel includes a front surface serving as a light emitting side and an opposite back surface, and the method includes:

[0072] S1, forming pixel units arranged in an array and a pixel defining layer separating the pixel units on a substrate,

[0073] S2. Form a first photoluminescent layer on the side of the pixel defining layer close to the front surface, wherein the orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate, and the first photoluminescent layer converts the invisible light it receives into visible light for emission.

[0074] In this embodiment, a first photoluminescent layer is formed on the pixel defining layer near the light-emitting side of the display panel to convert invisible light into visible light for emission, thereby making it possible to utilize the invisible light incident on the display panel from the external environment and the invisible light generated when the pixel unit emits light to increase the light-emitting color gamut of the display panel, thereby reducing the power consumption of the display panel. Moreover, based on the existing process, the process difficulty is not significantly increased, the production cost is low, and it has broad application prospects.

[0075] The display panel provided by the present application does not add any additional complex process steps. Instead, it is based on the existing product process and only forms a first photoluminescent layer on the pixel definition layer close to the light-emitting side of the display panel before forming the encapsulation layer. This can effectively utilize the invisible light in the environment as the output light emitted by the display panel. Because the first photoluminescent layer is arranged on the pixel definition layer and a color film layer is formed outside the encapsulation layer, the presence of the first photoluminescent layer will not affect the normal display of the display panel. Therefore, there is no need for additional other structural layers to guide the visible light generated by the first photoluminescent layer. Therefore, the display panel provided by the present application has a simple structural manufacturing process, low production cost, and has broad application prospects.

[0076] In some optional embodiments, for Figure 4 or Figure 5 In the display panel shown in the embodiment, after forming the first photoluminescent layer on the pixel definition layer near the front side, the method further includes:

[0077] forming an encapsulation layer on the first photoluminescent layer to cover the first photoluminescent layer and the pixel unit;

[0078] forming a plurality of grooves on a side of the encapsulation layer away from the substrate, wherein the orthographic projection of each groove on the substrate covers the orthographic projection of each black matrix on the substrate; and

[0079] forming a second photoluminescent layer in the groove;

[0080] A color filter layer is formed, which includes color filters of different colors and a black matrix arranged between the color filters of different colors. The orthographic projection of the black matrix on the substrate covers the orthographic projection of the second photoluminescent layer on the substrate.

[0081] Among them, the grooves and photoluminescent layers only require conventional patterning processes, without the need for additional complex process steps. Moreover, because the second photoluminescent layer is formed in the grooves below the black matrix, no additional structure is required to guide the visible light formed by the second photoluminescent layer. The process is simple, the production cost is low, and it has broad application prospects.

[0082] Based on the same inventive concept, an embodiment of the present invention further provides a display device including the display panel described in the above embodiment. Since the display panel included in the display device provided in the embodiment of the present application corresponds to the display panels provided in the above embodiments, it will not be described in detail in this embodiment.

[0083] In this embodiment, the display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, car display, digital photo frame or navigation system. By loading the above array substrate, it has good chip compatibility and product stability, and has broad application prospects.

[0084] In response to the current existing problems, the present invention develops a display panel, a manufacturing method thereof, and a display device. By providing a first photoluminescent layer arranged on the light-emitting side of the pixel defining layer close to the display panel, invisible light is converted into visible light for emission. In this way, the invisible light incident on the display panel from the external environment and the invisible light generated when the pixel unit emits light can be utilized to increase the light-emitting color gamut of the display panel, thereby reducing the power consumption of the display panel. Moreover, based on the existing process, the process difficulty is not significantly increased, the manufacturing cost is low, and the display device has broad application prospects.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A display panel comprising a plurality of pixel units arranged in an array on a substrate and a pixel defining layer separating the pixel units, wherein the display panel comprises a front surface serving as a light emitting side and an opposite back surface, wherein: Also includes: A first photoluminescent layer is formed on a side of the pixel defining layer close to the front surface, wherein the orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate, and the first photoluminescent layer converts the invisible light it receives into visible light for emission. The first photoluminescent layer is arranged on a side of the pixel defining layer away from the substrate. The display panel further comprises: a color filter layer formed on a side of the first photoluminescent layer away from the substrate, comprising color filters of different colors and a black matrix arranged between the color filters of different colors. The black matrix is arranged corresponding to the pixel defining layer, and the display panel further includes: an encapsulation layer formed between the first photoluminescent layer and the color filter layer; forming a plurality of grooves on a side of the encapsulation layer away from the first photoluminescent layer, wherein the orthographic projection of the black matrix on the substrate covers the orthographic projection of the grooves on the substrate; A second photoluminescent layer is formed in the groove to convert invisible light received by the second photoluminescent layer into visible light for emission.

2. The display panel according to claim 1, wherein: The pixel unit includes: an organic light-emitting layer defined by the pixel defining layer, The pixel defining layer includes: a surface close to the front surface and a sidewall surrounding the surface. The display panel further includes: a transparent electrode layer formed between the pixel defining layer and the first photoluminescent layer, the transparent electrode layer including a first sub-portion covering the organic light-emitting layer and a second sub-portion covering the surface and exposed sidewalls of the pixel defining layer. The first photoluminescent layer covers only a portion of the second sub-portion corresponding to the surface or covers the second sub-portion.

3. The display panel according to claim 1, wherein: The color filter layer further includes a third photoluminescent layer covering the sidewall of the black matrix, so as to convert the invisible light received by the third photoluminescent layer into visible light for emission.

4. The display panel according to claim 1, wherein: The material of the first photoluminescent layer is an acrylate resin with a benzene ring or a polyurethane resin with a benzene ring.

5. The display panel according to claim 1, wherein: Also includes: The integrated touch layer is arranged on a side of the first photoluminescent layer close to the color filter layer and includes a plurality of touch sensors.

6. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 5.

7. A method for manufacturing the display panel according to any one of claims 1 to 5, characterized in that: The display panel includes a front surface serving as a light emitting side and an opposite back surface, and the method includes: A plurality of pixel units arranged in an array and a pixel defining layer separating the pixel units are formed on a substrate. A first photoluminescent layer is formed on the side of the pixel defining layer close to the front surface, and the orthographic projection of the surface of the pixel defining layer close to the front surface on the substrate covers the orthographic projection of the first photoluminescent layer on the substrate. The first photoluminescent layer converts the invisible light it receives into visible light for output.

8. The method according to claim 7, characterized in that The first photoluminescent layer is disposed on a side of the pixel defining layer away from the substrate. After the first photoluminescent layer is formed on a side of the pixel defining layer close to the front surface, the method further includes: forming an encapsulation layer on the first photoluminescent layer to cover the first photoluminescent layer and the pixel unit; forming a plurality of grooves on a side of the encapsulation layer away from the substrate, wherein the orthographic projection of each groove on the substrate covers the orthographic projection of each black matrix on the substrate; and forming a second photoluminescent layer in the groove; A color filter layer is formed, the color filter layer including color filters of different colors and a black matrix arranged between the color filters of different colors, wherein the orthographic projection of the black matrix on the substrate covers the orthographic projection of the second photoluminescent layer on the substrate.

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