Display panel, preparation method of display panel and display device

Abstract

The invention relates to the technical field of display, in particular to a display panel, a preparation method of the display panel and a display device. The display panel includes: a substrate; the pixel limiting layer is positioned on one side of the substrate and is provided with a plurality of pixel openings; the dams are located on the side, away from the substrate, of the pixel limiting layer, and at least one dam is arranged on the outer side of at least part of the pixel openings; and the reflective layer at least covers the side wall, close to one side of the corresponding pixel opening, of the dam. The dams are arranged on the outer sides of the pixel openings, and the reflective layers covering the sides, close to the corresponding pixel openings, of the dams are arranged, so that large-angle light source reflection can be achieved, the divergence range is reduced, adjacent quantum dots are prevented from being excited, the problem of light crosstalk is solved, chromaticity uniformity is improved, and a good display effect is guaranteed.

Description

Technical Field

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

[0002] QD-OLED (Quantum Dot Organic Light-Emitting Diode) panel is a display panel that combines quantum dot (Quantum Dot, QD) and organic light-emitting diode (Organic Light-Emitting Diode, OLED) technology. QD-OLED panel uses quantum dots as the color conversion layer. Quantum dots are semiconductor nanocrystals that can produce pure monochrome red, green and blue light.

[0003] Conventional QD-OLED panels have crosstalk problems, which affects the display effect. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a display panel, a method for preparing a display panel, and a display device, which solve the problem of crosstalk in QD-OLED panels in related technologies, which affects the display effect.

[0005] The present disclosure provides a display panel, comprising: a substrate; a pixel defining layer, located on one side of the substrate, and having a plurality of pixel openings; a dam, located on a side of the pixel defining layer away from the substrate, at least part of the outer sides of the pixel openings having at least one of the dams; and a reflective layer, the reflective layer at least covering the side wall of the dam close to the corresponding pixel opening.

[0006] According to one embodiment of the present disclosure, it also includes: an anode layer, the anode layer fills at least a portion of the space of the pixel opening; the reflective layer covers at least a portion of the surface of the anode layer facing away from the substrate, and the reflective layer is made of the same material as the anode layer; preferably, the reflective layer also covers at least a portion of the surface of the pixel defining layer facing away from the substrate, and the reflective layer is disconnected between adjacent pixel openings; preferably, the reflective layer is disconnected at a position between the edge of the pixel opening and the dam corresponding to the pixel opening.

[0007] According to one embodiment of the present disclosure, it also includes: an organic layer, which is located on the side of the anode layer and the reflective layer facing away from the substrate, and the organic layer is disconnected between adjacent pixel openings; preferably, at least two dams are arranged between each two adjacent pixel openings, and the position where the organic layer is disconnected is located between adjacent dams.

[0008] According to one embodiment of the present disclosure, there is at least one groove between adjacent pixel openings, and the groove is formed on the reflective layer, or the groove is formed on the reflective layer and the pixel defining layer; wherein, in the direction from the substrate to the pixel defining layer, the thickness of the organic layer is less than the depth of the groove; preferably, there are at least two grooves between adjacent pixel openings; preferably, each pixel opening is correspondingly provided with at least one groove, and the groove is arranged around the outside of the corresponding pixel opening.

[0009] According to one embodiment of the present disclosure, it also includes: a cathode layer, which is located on the side of the organic layer away from the substrate, and in the direction from the substrate to the pixel defining layer, the thickness of the cathode layer at the position of the groove is less than the depth of the groove; the groove surrounds the outside of the pixel opening, and the groove is interrupted in a partial section on the extension path, and the part of the cathode layer located on the side of the groove close to the pixel opening and the part located on the side of the groove away from the pixel opening are connected at the interruption position of the groove; preferably, in the direction from the substrate to the pixel defining layer, the depth of the groove is greater than 0.5um; preferably, in the direction from one pixel opening to another adjacent pixel opening, the size of the opening of the groove is greater than 4um; preferably, in the direction from one pixel opening to another adjacent pixel opening, the distance between the edges of the openings of adjacent grooves is greater than 4um.

[0010] According to one embodiment of the present disclosure, it also includes: a cathode layer, which is located on the side of the organic layer away from the substrate, and in the direction from the substrate to the pixel defining layer, the depth of the groove is less than or equal to the thickness of the cathode layer at the position of the groove; preferably, in the direction from one pixel opening to another adjacent pixel opening, the size range of the opening of the groove is: 5um-10um; preferably, in the direction from one pixel opening to another adjacent pixel opening, the distance range between the edges of the openings of adjacent grooves is: 5um-10um; preferably, the groove is arranged around the outside of the pixel opening and continuously surrounds the pixel opening.

[0011] According to one embodiment of the present disclosure, the dam is arranged around the outside of the pixel opening and continuously surrounds the pixel opening; preferably, the distance between the edge of the dam and the edge of the pixel opening is in the range of 3um-5um; preferably, the width of the cross section of the dam is in the range of 5um-10um; preferably, in the direction from the substrate to the pixel defining layer, the height of the dam is greater than 1.6um.

[0012] The present disclosure also provides a method for preparing a display panel, comprising: providing a substrate; preparing a pixel defining layer, wherein the pixel defining layer is located on one side of the substrate and has a plurality of pixel openings; preparing a dam, wherein the dam is located on a side of the pixel defining layer away from the substrate, and at least part of the outer side of the pixel opening has at least one dam; and preparing a reflective layer, wherein the reflective layer at least covers the side wall of the dam close to the corresponding pixel opening.

[0013] According to an embodiment of the present disclosure, before the pixel defining layer is prepared, the method further includes: preparing an anode layer; preferably, the reflective layer is made of the same material as the anode layer, and after the reflective layer is prepared, the method further includes: performing a first patterning process to remove a portion of the reflective layer located between adjacent pixel openings, so that the reflective layer is disconnected between adjacent pixel openings; preferably, after the first patterning process, the method further includes: preparing an organic layer, the organic layer is located on a side of the anode layer and the reflective layer away from the substrate, and the organic layer is disconnected between adjacent pixel openings; preferably, before the organic layer is prepared, the method further includes: performing a second patterning process to remove a portion of the reflective layer located between adjacent dams, or to remove a portion of the reflective layer and a portion of the pixel defining layer located between adjacent dams, so as to form at least one groove between adjacent pixel openings, and the organic layer is disconnected at the groove position; preferably, after the organic layer is prepared, the method further includes: preparing a cathode layer located on a side of the organic layer away from the substrate.

[0014] The present disclosure also provides a display device, including the display panel of the above embodiment, or including a display panel prepared by using the preparation method of the above embodiment.

[0015] The embodiments of the present disclosure provide a display panel, a method for preparing a display panel, and a display device. By setting a dam on the outside of a pixel opening and setting a reflective layer covering the side of the dam close to the corresponding pixel opening, the reflective layer and the dam can reflect light sources at a large angle, reduce the divergence range, and avoid exciting adjacent quantum dots, which is beneficial to solving the problem of light crosstalk, improving chromaticity uniformity, and ensuring a good display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Shown is a schematic diagram of the optical crosstalk principle of a conventional QD-OLED display panel.

[0018] Figure 2 Shown is a schematic structural diagram of a display panel provided in one embodiment of the present disclosure.

[0019] Figure 3 Shown is a schematic structural diagram of a display panel provided by another embodiment of the present disclosure.

[0020] Figure 4 Shown is a schematic structural diagram of a display panel provided by another embodiment of the present disclosure.

[0021] Figure 5 Shown is a schematic diagram of the charge crosstalk principle of a conventional QD-OLED display panel.

[0022] Figure 6 Shown is a schematic diagram of a groove structure of a display panel provided in an embodiment of the present disclosure.

[0023] Figure 7 Shown is a schematic structural diagram of a display panel provided by another embodiment of the present disclosure.

[0024] Figure 8 Shown is a schematic diagram of a dam and groove structure in a display panel provided by an embodiment of the present disclosure.

[0025] Fig. 9 Shown is a schematic diagram of a dam and groove structure in a display panel provided by another embodiment of the present disclosure.

[0026] Fig.10 Shown is a flow chart of a method for preparing a display panel provided in one embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 10. Display panel; 100. Substrate; 200. Blue light OLED light source; 201. Quantum dots; 202. Light-transmitting layer; 300. Pixel defining layer; 301. Pixel opening; 400. Dam; 500. Reflective layer; 600. Anode layer; 700. Organic layer; 800. Cathode layer; 900. Groove. DETAILED DESCRIPTION

[0029] Figure 1 The figure shows the schematic diagram of the optical crosstalk principle of a conventional QD-OLED display panel. Figure 1 The arrows in the figure indicate the direction of the light.

[0030] Combination Figure 1QD-OLED display panel is a new type of display technology that can be applied to the field of large-size displays. QD-OLED uses blue light OLED as the main light source, and drives the blue light OLED to emit light through the substrate 100. The red and green quantum dots 201 and the light-transmitting layer 202 are placed above the blue light OLED light source 200 to form a color conversion layer. When blue light is irradiated onto the red and green quantum dots 201, the quantum dots 201 absorb the blue light and emit red and green light of specific wavelengths. By precisely controlling the brightness of the blue light OLED light source 200 and the luminous efficiency of the color conversion layer of the quantum dots 201, the blue light directly passes through the light-transmitting layer 202, while the red and green light are converted by the quantum dots 201 and emitted. The three together form a full-color picture.

[0031] Since there are other film layers and a certain distance between the blue OLED light source 200 and the quantum dot 201 device, when the blue OLED light source 200 emits light, the scattered light will excite the adjacent quantum dots 201 or pass through the adjacent light-transmitting layer 202. This optical crosstalk will cause uneven color on the screen.

[0032] The display panel 10 , the method for manufacturing the display panel and the display device of the present embodiment are intended to solve the above-mentioned technical problems.

[0033] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0034] Combination Figure 2 The display panel 10 of this embodiment includes a substrate 100, a pixel defining layer 300, a dam 400 and a light reflecting layer 500. The pixel defining layer 300 is located on one side of the substrate 100, and the pixel defining layer 300 has a plurality of pixel openings 301. The dam 400 is located on the side of the pixel defining layer 300 away from the substrate 100, and at least one dam 400 is provided outside at least part of the pixel openings 301. The light reflecting layer 500 at least covers the side wall of the dam 400 close to the corresponding pixel opening 301.

[0035] In this embodiment, each pixel opening 301 in the pixel defining layer 300 can be used as the arrangement position of the blue light OLED light source 200, and the light emitted by each blue light OLED light source 200 can be used to excite the corresponding quantum dot 201, or pass through the corresponding light-transmitting layer 202. The dam 400 located outside the pixel opening 301 and the reflective layer 500 covering the side of the dam 400 close to the corresponding pixel opening 301 can, on the one hand, block the light emitted by the blue light OLED light source 200 at the position of the pixel opening 301, reduce its outward dispersion, and effectively prevent the light emitted by the blue light OLED light source 200 from exciting other quantum dots 201, or passing through the non-corresponding light-transmitting layer 202, thereby reducing the crosstalk caused by the outward dispersion of light, and on the other hand, make the light at a large angle reflected and gathered, so as to ensure the light extraction efficiency.

[0036] Optionally, among the plurality of pixel openings 301 , each pixel opening 301 has at least one dam 400 on its outer side. Further, the light reflecting layer 500 at least covers the sidewalls of all the dams 400 on one side close to the corresponding pixel opening 301 .

[0037] Optionally, in the direction from the substrate 100 to the pixel defining layer 300, the side wall of the dam 400 close to the pixel opening 301 gradually tilts toward the direction away from the pixel opening 301. For example, the dam 400 is set as a retaining wall structure with an isosceles trapezoidal cross-section. As a result, the reflective structure formed by the side wall of the dam 400 close to the pixel opening 301 and the reflective layer 500 covering the side wall can have the ability to reflect large-angle light to the quantum dots 201 or the transparent layer 202 corresponding to the blue light OLED light source 200. Preferably, the reflective structure formed by the side wall of the dam 400 close to the pixel opening 301 and the reflective layer 500 covering the side wall is configured to reflect large-angle light to propagate in the direction from the substrate 100 to the pixel defining layer 300.

[0038] Combination Figure 8 and Fig. 9 In some embodiments of the present disclosure, the dam 400 is disposed around the outside of the pixel opening 301 and continuously surrounds the pixel opening 301. Exemplarily, the edge of the pixel opening 301 is rectangular or circular, and the dam 400 is a rectangular ring or a circular ring disposed around the outside of the pixel opening 301.

[0039] Thus, the dam 400 and the reflective layer 500 on the sidewall of the dam 400 can block and reflect the large-angle light emitted by the blue OLED light source 200 in the pixel opening 301 in different directions, thereby achieving a better anti-crosstalk effect. In addition, the blue OLED light source 200 pixels can be independently packaged, which is beneficial to improving the packaging stability of the screen body.

[0040] Preferably, the distance between the edge of the dam 400 and the edge of the pixel opening 301 is in the range of 3um-5um. In other words, the distance between the position where the side of the dam 400 close to the pixel opening 301 is connected to the pixel defining layer 300 and the edge of the pixel opening 301 is in the range of 3um-5um. For example, the distance between the position where the side of the dam 400 close to the pixel opening 301 is connected to the pixel defining layer 300 and the edge of the pixel opening 301 is 3um, 3.5um, 4um, 4.5um or 5um, etc.

[0041] Preferably, the width of the cross section of the dam 400 is in the range of 5um-10um, for example, the width of the cross section of the dam 400 is 5um, 8um or 10um, etc. The cross section of the dam 400 is a cross section perpendicular to the extending direction of the dam 400, and the width refers to the maximum dimension of the cross section of the dam 400 in a direction parallel to the substrate 100. For example, when the cross section of the dam 400 is a trapezoid, the width of the cross section of the dam 400 refers to the length of the bottom side of the trapezoid.

[0042] Preferably, in the direction from the substrate 100 to the pixel defining layer 300 , the height of the dam 400 is greater than 1.6 um. For example, in the direction from the substrate 100 to the pixel defining layer 300 , the height of the dam 400 is 1.8 um or 2 um.

[0043] The dam 400 structure with the above-mentioned size can achieve good anti-crosstalk effect and packaging effect, and when the film layer forming process of the blue light OLED light source 200 adopts the mask evaporation process, the size of the dam 400 will not affect the use of the mask.

[0044] Optionally, the material of the dam 400 includes organic glue.

[0045] Optionally, the material of the dam 400 is a low-refractive and high-reflective material.

[0046] Combination Figure 3 In some embodiments of the present disclosure, the display panel 10 further includes an anode layer 600, which fills at least part of the space of the pixel opening 301. For example, a part of the anode layer 600 fills the lower part of the pixel opening 301. The anode layer 600 mainly provides holes, promotes hole transport, and participates in the light emission process.

[0047] The reflective layer 500 covers at least a portion of the surface of the anode layer 600 that is away from the substrate 100 . The reflective layer 500 and the anode layer 600 are made of the same material.

[0048] Through the above-mentioned arrangement, the difficulty of the process can be effectively reduced. Specifically, since the reflective layer 500 and the anode layer 600 are made of the same material, when preparing the reflective layer 500, the position where the reflective layer 500 covers the anode layer 600 can be used as a part of the anode layer 600, and will not have an adverse effect on the light-emitting process. Therefore, there is no need to remove the portion of the reflective layer 500 covering the anode layer 600.

[0049] Optionally, the reflective layer 500 also covers at least part of the surface of the pixel defining layer 300 on the side away from the substrate 100, and the reflective layer 500 is disconnected between adjacent pixel openings 301. Exemplarily, the reflective layer 500 covers the side of the anode layer 600 in the pixel opening 301 away from the substrate 100, and the reflective layer 500 includes an ITO / Ag / ITO layer. The reflective layer 500 is disconnected at a position between the edge of the pixel opening 301 and the dam 400 corresponding to the pixel opening 301. It is sufficient to remove the reflective layer 500 between the edge of the pixel opening 301 and the dam 400 corresponding to the pixel opening 301. Compared with the original display panel 10 preparation process, in this embodiment, only one anode layer 600 process and a dry etching process are added to form the reflective layer 500, so the process flow is simple and has higher feasibility.

[0050] Optionally, the reflective layer 500 covers the side of the dam 400 away from the substrate 100, the side of the dam 400 away from the pixel opening 301, and covers part of the surface of the pixel defining layer 300 away from the substrate 100. Therefore, in the process of preparing the reflective layer 500, the reflective layer 500 can be evaporated on the entire surface, and then patterned to remove the molding process of the reflective layer 500 between the edge of the pixel opening 301 and the dam 400 corresponding to the pixel opening 301, thereby further reducing the process difficulty.

[0051] Combination Figure 4 In some embodiments of the present disclosure, the display panel 10 further includes an organic layer 700 , which is located on a side of the anode layer 600 and the reflective layer 500 facing away from the substrate 100 , and the organic layer 700 is disconnected between adjacent pixel openings 301 .

[0052] Combination Figure 5 , Figure 5 FIG. 1 is a schematic diagram showing the charge crosstalk principle of a conventional QD-OLED display panel 10. Figure 5The dotted line in the figure indicates the direction of charge movement, and the arrow indicates the direction of light emission. Since the blue OLED light source 200 adopts a stacked device structure, its organic layer 700 has the ability to transmit charges laterally. Therefore, there is a problem of electrical crosstalk between adjacent pixels. In the display panel 10 of this embodiment, the organic layer 700 is disconnected between adjacent pixel openings 301, so that charges cannot be transmitted laterally between adjacent pixels, which can avoid driving adjacent pixels to emit light, effectively solve the problem of electrical crosstalk, and improve color uniformity.

[0053] In this embodiment, the organic layer 700 can be disconnected at any position between adjacent pixel openings 301 . Preferably, at least two dams 400 are provided between every two adjacent pixel openings 301 , and the position where the organic layer 700 is disconnected is located between adjacent dams 400 .

[0054] Combination Figure 6 In some embodiments of the present disclosure, at least one groove 900 is provided between adjacent pixel openings 301, and the organic layer 700 is disconnected at the position of the groove 900. Specifically, in the direction from the substrate 100 to the pixel defining layer 300, the depth of the groove 900 is greater than the thickness of the organic layer 700, so that the portion of the organic layer 700 located within the groove 900 is disconnected from the portion located outside the groove 900, thereby realizing the disconnection of the organic layer 700 between adjacent pixel openings 301.

[0055] Preferably, there are at least two grooves 900 between adjacent pixel openings 301, for example, the number of grooves 900 between adjacent pixel openings 301 is 2. Providing more than two grooves 900 is helpful to ensure that the organic layer 700 is disconnected between adjacent pixel openings 301, thereby improving reliability.

[0056] Preferably, each pixel opening 301 is correspondingly provided with at least one groove 900, and the groove 900 is arranged around the outer side of the corresponding pixel opening 301, so that the organic layer 700 can be disconnected in multiple directions.

[0057] The groove 900 in this embodiment may be a groove structure formed by removing a portion of the light reflecting layer 500 between adjacent dams 400, that is, the groove 900 is formed in the light reflecting layer 500; or the groove 900 may be a groove structure formed by removing a portion of the light reflecting layer 500 and a portion of the pixel defining layer 300 between adjacent dams 400, that is, the groove 900 is formed in the light reflecting layer 500 and the pixel defining layer 300. Since the thickness of the organic layer 700 is less than the depth of the groove 900, the height of the upper surface of the organic layer 700 in the groove 900 is less than the height of the lower surface of the organic layer 700 outside the groove 900, and therefore the organic layer 700 in the groove 900 is not connected to the organic layer 700 outside the groove 900.

[0058] Optionally, the cross-sectional width of the groove 900 gradually decreases from the groove bottom to the opening position of the groove 900 , thereby making it easier to ensure that the organic layer 700 is disconnected at the position of the groove 900 .

[0059] Combination Figure 4 and Figure 8 As an embodiment of the present disclosure, the display panel 10 further includes a cathode layer 800, which is located on the side of the organic layer 700 away from the substrate 100. The material of the cathode layer 800 includes metal or other conductive materials. In the direction from the substrate 100 to the pixel defining layer 300, the thickness of the cathode layer 800 at the position of the groove 900 is less than the depth of the groove 900, so that the cathode layer 800 at the position of the groove 900 is disconnected from the cathode layer 800 located outside the groove 900.

[0060] The groove 900 surrounds the outside of the pixel opening 301, and the groove 900 is interrupted in a partial section on the extension path. The groove 900 structure is not set at the interrupted position. In other words, the groove 900 is a non-closed ring, and the unclosed position of the groove 900 is the above-mentioned interrupted position.

[0061] The portion of the cathode layer 800 located on the side of the groove 900 close to the pixel opening 301 is connected to the portion of the groove 900 located on the side away from the pixel opening 301 at the interruption position of the groove 900. Thus, the groove 900 can be prevented from affecting the conductivity of the cathode layer 800.

[0062] Optionally, in the direction from the substrate 100 to the pixel defining layer 300, the depth of the groove 900 is greater than 0.5um, for example, the depth of the groove 900 is 0.7um, 0.9um or 1um. In the direction from one pixel opening 301 to another adjacent pixel opening 301, the size of the opening of the groove 900 is greater than 4um, for example, the size of the opening of the groove 900 is 4.5um, 5um, 5.5um or 6um, etc. In the direction from one pixel opening 301 to another adjacent pixel opening 301, the distance between the edges of the openings of the adjacent grooves 900 is greater than 4um, for example, the distance between the edges of the openings of the adjacent grooves 900 is 4.5um, 5um, 5.5um or 6um, etc. The above three size settings are all convenient for ensuring that the organic layer 700 is disconnected at the position of the groove 900.

[0063] In this embodiment, since the thickness of the cathode layer 800 at the position of the groove 900 is less than the depth of the groove 900, the cathode layer 800 at the position of the groove 900 is disconnected from the cathode layer 800 located outside the groove 900. In order to ensure the conductivity of the cathode layer 800, the groove 900 is interrupted in a partial section on the extension path. As a modified structure of this embodiment, the thickness of the cathode layer 800 at the position of the groove 900 is less than the depth of the groove 900, and the cathode layer 800 at the position of the groove 900 is disconnected from the cathode layer 800 located outside the groove 900. The groove 900 is a closed annular groove surrounding the outside of the pixel opening 301. A connection layer is provided at a part of the groove 900. The connection layer and the cathode layer 800 are made of the same material. The connection layer connects the part of the cathode layer 800 located outside the groove 900 and the part of the cathode layer 800 located inside the groove 900, thereby ensuring the conductivity of the cathode layer 800.

[0064] Combination Figure 7 and Fig. 9 As another embodiment of the present disclosure, the display panel 10 also includes a cathode layer 800, which is located on the side of the organic layer 700 away from the substrate 100, and in the direction from the substrate 100 to the pixel defining layer 300, the depth of the groove 900 is less than or equal to the thickness of the cathode layer 800 at the position of the groove 900.

[0065] Since the depth of the groove 900 in the direction from the substrate 100 to the pixel defining layer 300 is less than or equal to the thickness of the cathode layer 800 at the groove 900 , the cathode layer 800 is not broken at the groove 900 , thereby ensuring the conductivity of the cathode layer 800 .

[0066] In an optional form, the thickness of the cathode layer 800 at the position of the groove 900 is equal to the thickness of the cathode layer 800 outside the groove 900 , that is, the thickness of the cathode layer 800 is uniform, and the overall thickness of the cathode layer 800 is greater than or equal to the depth of the groove 900 .

[0067] In another optional form, the thickness of the cathode layer 800 at the position of the groove 900 is greater than the thickness of the cathode layer 800 outside the groove 900 , and the conductivity of the cathode layer 800 is ensured by thickening the cathode layer 800 at the position of the groove 900 .

[0068] Optionally, in the direction in which one pixel opening 301 points to another adjacent pixel opening 301, the size of the opening of the groove 900 ranges from 5um to 10um. For example, in the direction in which one pixel opening 301 points to another adjacent pixel opening 301, the size of the opening of the groove 900 is 5um, 6um, 7um, 8um, 9um or 10um. In the direction in which one pixel opening 301 points to another adjacent pixel opening 301, the distance between the edges of the openings of the adjacent grooves 900 ranges from 5um to 10um. For example, in the direction in which one pixel opening 301 points to another adjacent pixel opening 301, the distance between the edges of the openings of the adjacent grooves 900 is 5um, 6um, 7um, 8um, 9um or 10um. The above two size settings facilitate ensuring that the organic layer 700 is disconnected at the position of the groove 900, and the cathode layer 800 is not disconnected at the position of the groove 900, and are conducive to reducing the difficulty of the process.

[0069] In this embodiment, since the cathode layer 800 is not broken at the position of the groove 900, the groove 900 can be set to a closed-loop groove 900 structure or an open-loop groove 900 structure. Preferably, the groove 900 is arranged around the outside of the pixel opening 301 and continuously surrounds the pixel opening 301.

[0070] Combine the following Fig.10 A method for manufacturing a display panel provided in an embodiment of the present disclosure is described. The method for manufacturing the display panel in this embodiment can be referenced to the display panel 10 in the above embodiment.

[0071] The method for manufacturing a display panel according to this embodiment includes:

[0072] S1. Provide a substrate 100.

[0073] S2 . Prepare a pixel defining layer 300 . The pixel defining layer 300 is located on one side of the substrate 100 and has a plurality of pixel openings 301 .

[0074] S3 , preparing a dam 400 , wherein the dam 400 is located on a side of the pixel defining layer 300 facing away from the substrate 100 , and at least one dam 400 is disposed outside at least a portion of the pixel opening 301 .

[0075] S4 , preparing a reflective layer 500 , wherein the reflective layer 500 at least covers the side wall of the dam 400 close to the corresponding pixel opening 301 .

[0076] To reduce the processing difficulty of the reflective layer 500 , optionally, the reflective layer 500 and the anode layer 600 are made of the same material. After preparing the reflective layer 500 , the preparation method further includes: performing a first patterning treatment to remove a portion of the reflective layer 500 located between adjacent pixel openings 301 , so that the reflective layer 500 is disconnected between adjacent pixel openings 301 .

[0077] In this embodiment, when preparing the reflective layer 500, the reflective layer 500 can cover not only the side of the dam 400 close to the corresponding pixel opening 301, but also cover at least part of the surface of the anode layer 600 away from the substrate 100, the side of the dam 400 away from the substrate 100, the side of the dam 400 away from the pixel opening 301, and part of the surface of the pixel defining layer 300 away from the substrate 100. Therefore, the CMM evaporation process can be used to evaporate the entire surface of the reflective layer 500, reducing the process difficulty and improving the feasibility. At the same time, the reflective layer 500 is subjected to the first patterning process to avoid the anode layers 600 located at different pixel openings 301 being connected through the reflective layer 500, thereby ensuring the light-emitting function of each pixel position.

[0078] In one embodiment of the present disclosure, before preparing the pixel defining layer 300, the method further includes:

[0079] An anode layer 600 is prepared, and the anode layer 600 fills at least a portion of the space of the pixel opening 301 .

[0080] In one embodiment of the present disclosure, after performing the first patterning process, the method for preparing a display panel of the present embodiment further includes:

[0081] An organic layer 700 is prepared. The organic layer 700 is located on the side of the anode layer 600 and the light reflecting layer 500 facing away from the substrate 100 . The organic layer 700 is disconnected between adjacent pixel openings 301 .

[0082] In one embodiment of the present disclosure, before preparing the organic layer 700, the method for preparing the display panel of this embodiment further includes:

[0083] A second patterning process is performed to remove part of the reflective layer 500 between adjacent dams 400 , or to remove part of the reflective layer 500 and part of the pixel defining layer 300 between adjacent dams 400 , so as to form at least one groove 900 between adjacent pixel openings 301 , and the organic layer 700 is disconnected at the groove 900 .

[0084] In this embodiment, the organic layer 700 is disconnected by preparing the groove 900, which solves the problem of electrical crosstalk and improves the color uniformity. At the same time, the original preparation process of the organic layer 700 and the cathode layer 800 will not be changed, which is beneficial to reduce the difficulty of the process. Moreover, it will not damage the functions of the organic layer 700 and the cathode layer 800, which is beneficial to ensure the reliability of the display panel 10.

[0085] In one embodiment of the present disclosure, after preparing the organic layer 700, the method for preparing the display panel of this embodiment further includes:

[0086] A cathode layer 800 is prepared and located on the side of the organic layer 700 facing away from the substrate 100 .

[0087] In one embodiment of the present disclosure, after preparing the cathode layer 800, the method for preparing the display panel of this embodiment further includes:

[0088] A packaging layer is prepared, and the packaging layer is located on a side of the cathode layer 800 facing away from the substrate 100 .

[0089] This embodiment further provides a display device, including the display panel 10 described above, or including the display panel 10 prepared by the above preparation method.

[0090] In this embodiment, the display device has an image display function and can be widely used in different scenarios. Optionally, the display device can present static images, such as pictures or photos, to provide users with visual information display. At the same time, it can also play dynamic images, such as video content, to bring users a more vivid and rich visual experience.

[0091] In practical applications, the display device can be presented in various forms, including but not limited to laptops, mobile phones, handheld or portable computers, cameras, camcorders and other portable devices. In addition, the display device can also be used as a core display component of devices such as vehicle-mounted intelligent central control screens, calculators, smart watches, GPS navigators, etc. In the advertising and commercial fields, it can also be used as an electronic billboard or signboard. When combined with a projector, it can also display content on the screen.

[0092] It is worth mentioning that in addition to the basic image display function, the display device can also have a variety of other practical functions. For example, it can integrate photo taking and video recording functions. At the same time, in order to enhance security and convenience, it can also be equipped with biometric technologies such as fingerprint recognition and face recognition to provide users with a safer and more convenient user experience. In order to achieve these functions, the display device can integrate corresponding functional modules, such as under-screen cameras and under-screen fingerprint recognition sensors.

[0093] The phrases "one embodiment", "an embodiment", etc. mentioned in the specification indicate that the embodiment described may include a specific feature, structure or characteristic, but not every embodiment may include the specific feature, structure or characteristic. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments, whether explicitly or not explicitly described.

[0094] It should be understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0095] Additionally, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one component or feature to other components or features as shown in the figures. The spatially relative terms are intended to encompass different orientations of the component in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0096] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0097] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A display panel, characterized in that: include: substrate; A pixel defining layer, located on one side of the substrate, having a plurality of pixel openings; A dam is located on a side of the pixel defining layer away from the substrate, and at least one dam is provided outside at least part of the pixel opening; A reflective layer at least covers a side wall of the dam that is close to the corresponding pixel opening.

2. The display panel according to claim 1, characterized in that: Also includes: an anode layer, the anode layer filling at least a portion of the space of the pixel opening; The reflective layer covers at least a portion of the surface of the anode layer facing away from the substrate, and the reflective layer and the anode layer are made of the same material; Preferably, the light reflecting layer also covers at least a portion of the surface of the pixel defining layer facing away from the substrate, and the light reflecting layer is disconnected between adjacent pixel openings; Preferably, the reflective layer is disconnected at a position between the edge of the pixel opening and the dam corresponding to the pixel opening.

3. The display panel according to claim 1 or 2, characterized in that: Also includes: an organic layer, located on a side of the anode layer and the light reflecting layer facing away from the substrate, wherein the organic layer is disconnected between adjacent pixel openings; Preferably, at least two dams are arranged between every two adjacent pixel openings, and the position where the organic layer is disconnected is located between the adjacent dams.

4. The display panel according to claim 3, characterized in that: There is at least one groove between adjacent pixel openings, and the groove is formed on the reflective layer, or the groove is formed on the reflective layer and the pixel defining layer; Wherein, in the direction from the substrate to the pixel defining layer, the thickness of the organic layer is less than the depth of the groove; Preferably, there are at least two grooves between adjacent pixel openings; Preferably, each pixel opening is correspondingly provided with at least one of the grooves, and the groove is arranged around the outer side of the corresponding pixel opening.

5. The display panel according to claim 4, characterized in that: Also includes: a cathode layer, located on a side of the organic layer away from the substrate, and in a direction from the substrate to the pixel defining layer, a thickness of the cathode layer at the position of the groove is less than a depth of the groove; The groove surrounds the outside of the pixel opening, the groove is interrupted in a partial section on the extension path, and the portion of the cathode layer located on the side of the groove close to the pixel opening is connected to the portion of the cathode layer located on the side of the groove away from the pixel opening at the interruption position of the groove; Preferably, in the direction from the substrate to the pixel defining layer, the depth of the groove is greater than 0.5 um; Preferably, in the direction in which one pixel opening points to another adjacent pixel opening, the size of the opening of the groove is greater than 4 um; Preferably, in a direction from one pixel opening to another adjacent pixel opening, a distance between edges of respective openings of adjacent grooves is greater than 4 um.

6. The display panel according to claim 4, characterized in that: Also includes: a cathode layer, located on a side of the organic layer away from the substrate, wherein in a direction from the substrate to the pixel defining layer, the depth of the groove is less than or equal to the thickness of the cathode layer at the position of the groove; Preferably, in the direction in which one pixel opening points to another adjacent pixel opening, the size range of the opening of the groove is: 5um-10um; Preferably, in the direction in which one pixel opening points to another adjacent pixel opening, the distance between the edges of the openings of the adjacent grooves is in the range of 5um-10um; Preferably, the groove is arranged around the outside of the pixel opening and continuously surrounds the pixel opening.

7. The display panel according to claim 1 or 2, characterized in that: The dam is disposed around the outside of the pixel opening and continuously surrounds the pixel opening; Preferably, the distance between the edge of the dam and the edge of the pixel opening is in the range of: 3um-5um; Preferably, the width of the cross section of the dam is in the range of: 5um-10um; Preferably, in the direction from the substrate to the pixel defining layer, the height of the dam is greater than 1.6 um.

8. A method for preparing a display panel, characterized in that: include: providing a substrate; preparing a pixel defining layer, wherein the pixel defining layer is located on one side of the substrate and has a plurality of pixel openings; Prepare a dam, wherein the dam is located on a side of the pixel defining layer facing away from the substrate, and at least one dam is provided outside at least part of the pixel opening; A reflective layer is prepared, wherein the reflective layer at least covers the side wall of the dam close to the corresponding pixel opening.

9. The method for preparing a display panel according to claim 8, characterized in that: Before preparing the pixel defining layer, the method further includes: preparing an anode layer; Preferably, the reflective layer and the anode layer are made of the same material. After preparing the reflective layer, the preparation method further comprises: Performing a first patterning process to remove a portion of the light reflecting layer located between adjacent pixel openings, so that the light reflecting layer is disconnected between adjacent pixel openings; Preferably, after the first patterning process is performed, the method further comprises: preparing an organic layer, wherein the organic layer is located on a side of the anode layer and the light reflecting layer facing away from the substrate, and the organic layer is disconnected between adjacent pixel openings; Preferably, before preparing the organic layer, the method further comprises: Performing a second patterning process to remove a portion of the light reflecting layer between adjacent dams, or to remove a portion of the light reflecting layer and a portion of the pixel defining layer between adjacent dams, so as to form at least one groove between adjacent pixel openings, wherein the organic layer is disconnected at the position of the groove; Preferably, after preparing the organic layer, the method further comprises: A cathode layer is prepared and located on the side of the organic layer facing away from the substrate.

10. A display device, characterized in that: The display panel comprises the display panel as claimed in any one of claims 1 to 7, or comprises the display panel prepared by the preparation method as claimed in claim 8 or 9.

Images