Display panel and display device

Abstract

The embodiments of the present invention disclose a display panel and a display device. The display panel includes: a substrate, the substrate including a plurality of sub-pixel regions and a plurality of spacer regions, wherein the spacer region is located between any two adjacent sub-pixel regions; a carrier transport layer, disposed on one side of the substrate and located in the sub-pixel regions and the spacer region; and an inorganic insulating structure, disposed in at least a portion of the spacer region and located on the side of the carrier transport layer close to the substrate. In the technical solution of the present application, the presence of the inorganic insulating structure is conducive to suppressing the lateral transport of carriers in the carrier transport layer, reducing the occurrence of lateral leakage, greatly avoiding the color crosstalk phenomenon between adjacent sub-pixel regions, and improving the display effect of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] OLEDs (organic light-emitting diodes) are current-driven light-emitting devices with advantages such as fast response, autonomous illumination, wide viewing angles, and a wide operating temperature range, making them widely used in high-performance display applications. OLED display devices are equipped with sub-pixels of different colors. When a single-color sub-pixel is illuminated, adjacent sub-pixels of other colors also illuminate slightly, causing color crosstalk, which affects the image's chromaticity and display quality. Summary of the Invention

[0003] In view of this, the present invention provides a display panel and a display device to reduce color crosstalk and improve the display effect of the display panel and the display device.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0005] a substrate comprising a plurality of sub-pixel regions and a plurality of spacer regions, wherein the spacer region is located between any two adjacent sub-pixel regions;

[0006] a carrier transport layer, disposed on one side of the substrate and located in the sub-pixel region and the spacer;

[0007] The inorganic insulating structure is disposed in at least a portion of the spacer region and is located on a side of the carrier transport layer close to the substrate.

[0008] In a second aspect, an embodiment of the present invention further provides a display device, comprising the display panel described in the first aspect of the present invention.

[0009] In an embodiment of the present invention, a display panel includes: a substrate including multiple sub-pixel regions and multiple spacers, wherein the spacers are located between any two adjacent sub-pixel regions; a carrier transport layer disposed on one side of the substrate and located within the sub-pixel regions and the spacers; and an inorganic insulating structure disposed in at least a portion of the spacers and located on the side of the carrier transport layer closest to the substrate. In the technical solution of this application, the presence of the inorganic insulating structure helps suppress the lateral transport of carriers within the carrier transport layer, reduces the occurrence of lateral leakage, greatly avoids color crosstalk between adjacent sub-pixel regions, and improves the display quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of a display panel in related art;

[0011] Figure 2 A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0012] Figure 3 for Figure 2 Schematic diagram of the cross-section structure along A-A';

[0013] Figure 4 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0014] Figure 5 for Figure 4 The cross-sectional structure diagram of the display panel along line BB' is shown;

[0015] Figure 6 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0016] Figure 7 for Figure 6 The cross-sectional structure diagram of the display panel along CC' is shown;

[0017] Figures 8 to 10 Current efficiency diagrams of three sub-pixel regions with different luminous colors provided by an embodiment of the present invention;

[0018] Figure 11 A schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention;

[0019] Figure 12 A schematic cross-sectional view of another display panel provided by an embodiment of the present invention;

[0020] Figure 13 A schematic structural diagram of a display device provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0022] Figure 1 is a schematic diagram of the structure of a display panel in the related art, such as Figure 1As shown in , in the related art, different sub-pixels in the display panel are separated by a pixel spacer 10'. The pixel spacer 10' is usually made of an organic material such as polyimide (PI), which contains a large number of highly active ions (such as F ions, S ions, etc.). In addition, the display panel includes a semiconductor organic layer 4' (such as a hole transport layer) arranged as a whole layer. Taking the hole transport layer as an example, the hole transport layer is used to transport holes within the sub-pixel to make the sub-pixel emit light. The semiconductor organic layer 4' covers the sub-pixels of different colors and the pixel spacer 10' between the sub-pixels. The inventors conducted a component analysis on the surface of the pixel spacer 10' and found that there are many C=C double bonds and CF bonds on the surface of the pixel spacer 10', indicating that the pixel spacer 10' is conducive to the combination of different ions. Therefore, it can be determined that the highly active ions in the pixel spacer 10' will aggravate the transmission of current in the semiconductor organic layer 4' within the sub-pixels of different colors in the horizontal direction, that is, the phenomenon of lateral leakage occurs, which in turn causes the problem of lateral color crosstalk in the display panel.

[0023] In view of this, the inventors proposed the technical solution in this application. Specifically, this application proposes a display panel, including:

[0024] A substrate comprising a plurality of sub-pixel regions and a plurality of spacer regions, wherein the spacer region is located between any two adjacent sub-pixel regions;

[0025] A carrier transport layer is provided on one side of the substrate and is located in the sub-pixel region and the spacer region;

[0026] The inorganic insulating structure is disposed in at least a portion of the spacer area and is located on a side of the carrier transport layer close to the substrate.

[0027] In the technical solution of the present application, the presence of the inorganic insulating structure is conducive to suppressing the lateral transmission of carriers in the carrier transport layer, reducing the occurrence of lateral leakage, greatly avoiding the color crosstalk phenomenon in adjacent sub-pixel areas, and improving the display effect of the display panel.

[0028] The above is the core concept of the present invention. The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Figure 2 A schematic structural diagram of a display panel provided by an embodiment of the present invention is shown in FIG. Figure 3 for Figure 2 Schematic diagram of the cross-section structure along A-A', refer to Figure 2 and Figure 3The display panel includes: a substrate 1, the substrate 1 includes a plurality of sub-pixel regions 2 and a plurality of spacer regions 3, the spacer region 3 is located between any two adjacent sub-pixel regions 2; a carrier transport layer 4, arranged on one side of the substrate 1, and located in the sub-pixel region 2 and the spacer region 3; an inorganic insulating structure 5, arranged in at least part of the spacer region 3, and located on the side of the carrier transport layer 4 close to the substrate 1.

[0030] like Figure 2 and Figure 3 As shown in , a substrate 1 is provided in the display panel, and a plurality of sub-pixel regions 2 and a spacer region 3 between any two adjacent sub-pixel regions 2 can be divided on the substrate 1, and the spacer region 3 is used to space any two adjacent sub-pixel regions 2. A carrier transport layer 4 is also provided in the display panel, and the carrier transport layer 4 is provided on one side of the substrate 1, and covers the sub-pixel region 2 and the spacer region 3, that is, the carrier transport layer 4 is provided as a whole layer on one side of the substrate 1, and the carrier transport layer 4 is used to transport carriers when the sub-pixel region 2 emits light. It can be understood by those skilled in the art that the transported carriers mentioned here generally refer to the transported holes, and the sub-pixel region 2 of the display panel is also provided with conventional film layers such as an anode layer 6, a light-emitting layer 7, an electron transport layer 8 and a cathode layer 9, and the anode layer 6, the carrier transport layer 4, the light-emitting layer 7, the electron transport layer 8 and the cathode layer 9 are stacked in sequence. When the sub-pixel region 2 is controlled to emit light, the holes transported by the carrier transport layer 4 and the electrons transported by the electron transport layer 8 in the sub-pixel region 2 reach the light-emitting layer 7 , causing the light-emitting layer 7 in the sub-pixel region 2 to emit light.

[0031] Optionally, the anode layer 6, the carrier transport layer 4, the electron transport layer 8 and the cathode layer 9 can all be formed by a common mask evaporation method, and the light-emitting layer 7 can be formed by a fine metal mask evaporation method.

[0032] It is worth mentioning that in the present application, an inorganic insulating structure 5 is also provided in the display panel. The inorganic junction structure is provided in at least a portion of the spacer 3, that is, the inorganic insulating structure 5 is provided between at least a portion of adjacent sub-pixel regions 2; and the inorganic insulating structure 5 is provided on the side of the carrier transport layer 4 close to the substrate 1. It can also be understood that, along the light emitting direction of the display panel, the inorganic insulating structure 5 is located between the substrate 1 and the carrier transport layer 4. It can be understood that the inorganic insulating structure 5 is formed of an inorganic material, which does not contain highly active ions and does not promote the lateral transport of carriers in the carrier transport layer 4. This greatly avoids the color crosstalk phenomenon in the adjacent sub-pixel regions 2 on both sides of the spacer 3 where the inorganic insulating structure 5 is provided, reduces the occurrence of lateral leakage, and improves the display effect of the display panel.

[0033] Optionally, in actual application, those skilled in the art can set the position of the inorganic insulating structure 5 on the substrate 1 according to actual needs. Figure 2 and Figure 3 In the embodiment shown, the inorganic insulating structure 5 is disposed in all the spacers 3, but the actual arrangement is not limited thereto. For example, the inorganic insulating structure 5 can also be disposed in the spacers 3 between the sub-pixel regions 2 of different luminous colors, or the inorganic insulating structure 5 can be disposed only in the spacers 3 on both sides of the sub-pixel region 2 where leakage current is obvious. Figure 2 In the top view shown, the spacer region 3 , the carrier transport layer 4 and the inorganic insulating structure 5 overlap.

[0034] Additionally, optionally, Figure 2 The inorganic insulating structure 5 shown in FIG is located between the carrier transport layer 4 and the substrate 1 and contacts the carrier transport layer 4. The actual arrangement is not limited to this. The inorganic insulating structure 5 contacts the carrier transport layer 4, and the effect of blocking carrier transport is more significant. In other possible embodiments, if other film layers are disposed between the carrier transport layer 4 and the substrate 1, the inorganic insulating structure 5 can be disposed between any two film layers, as long as the inorganic insulating structure 5 can inhibit the lateral transport of carriers within the carrier transport layer 4.

[0035] In an embodiment of the present invention, a display panel includes: a substrate comprising a plurality of sub-pixel regions and a plurality of spacers, wherein the spacers are located between any two adjacent sub-pixel regions; a carrier transport layer disposed on one side of the substrate and located within the sub-pixel regions and the spacers; and an inorganic insulating structure disposed in at least a portion of the spacers and located on the side of the carrier transport layer closest to the substrate. In the above technical solution, the presence of the inorganic insulating structure helps suppress lateral carrier transport within the carrier transport layer, reducing the occurrence of lateral leakage, significantly preventing color crosstalk between adjacent sub-pixel regions, and improving the display quality of the display panel.

[0036] Optional, can still refer to Figure 3 In a possible embodiment, the display panel may further include a pixel definition layer 10, which is arranged between the substrate 1 and the carrier transport layer 4. The pixel definition layer 10 includes a plurality of openings 11 and a plurality of spacers 12. The spacers 12 are located between any two adjacent openings 11. The plurality of openings 11 correspond to a plurality of sub-pixel regions 2. The spacers 12 are arranged in the spacer area 3. The inorganic insulating structure 5 includes an inorganic insulating layer 13. The inorganic insulating layer 13 is located on at least one side of the portion of the spacers 12 close to the carrier transport layer 4.

[0037] Specifically, if Figure 3As shown in , the display panel is further provided with a pixel definition layer 10, which is disposed on the substrate 1. The pixel definition layer 10 includes a plurality of openings 11 and a spacer 12 between any two adjacent openings 11. The openings 11 of the pixel definition layer 10 correspond to the sub-pixel regions 2, and the spacer 12 is located in the spacer region 3. The spacer 12 of the pixel definition layer 10 is similar to the pixel spacer 10' in the related art and is used to separate different sub-pixel regions 2. In this embodiment, the pixel definition layer 10 can be an organic film layer, that is, the spacer 12 is formed of an organic material.

[0038] Those skilled in the art will understand that when a pixel definition layer 10 is used to define a plurality of sub-pixel regions 2, the preparation process of the display panel can be roughly described as follows: first, an anode layer 6 is deposited on one side of the substrate 1, and the anode layer 6 is etched to form a plurality of anodes arranged in an array; secondly, a pixel definition layer 10 is deposited on the substrate 1, and the pixel definition layer 10 is etched to form a plurality of openings 11 and a plurality of spacers 12, the anodes are exposed from the openings 11, each anode corresponds to a sub-pixel region 2, and any two adjacent anodes are separated by a spacer 12; further, a carrier transport layer 4 is deposited on the side of the anode and the spacer 12 away from the substrate 1, and the carrier transport layer 4 covers all the anodes and the spacer 12; then, a luminescent material is deposited in the opening 11 to form a luminescent layer 7, the luminescent layer 7 covers the carrier transport layer 4, and different luminescent materials are deposited in sub-pixel regions 2 of different colors; and then an electron transport layer 8 and a cathode layer 9 are formed on the side of the luminescent layer 7 away from the carrier transport layer 4.

[0039] Further, continue to refer to Figure 3 When a pixel definition layer 10 formed of an organic material is used to define different sub-pixel regions 2, the inorganic insulating structure 5 can be configured as an inorganic insulating layer 13. The inorganic insulating layer 13 is disposed on at least a portion of the surface of the spacer 12. The surface of the spacer 12 is the side of the spacer 12 that is close to the carrier transport layer 4. In this configuration, within the portion of the spacer region 3, the spacer 12, the inorganic insulating layer 13, and the carrier transport layer 4 are stacked in sequence. The inorganic insulating layer 13 can inhibit the lateral transport of carriers.

[0040] Among them, the inorganic insulating layer 13 can be prepared before depositing the carrier transport layer 4. The inorganic insulating layer 13 can be first deposited on the surface of part of the spacer 12, and then the carrier transport layer 4 can be prepared on the side of the anode and the inorganic insulating layer 13 away from the substrate 1.

[0041] In this embodiment, the pixel definition layer 10 in the display panel is formed in the same manner as in the prior art. Simply disposing an inorganic insulating layer 13 on the surface of a portion of the spacers 12 of the pixel definition layer 10 can block lateral carrier transport. This eliminates the need for significant adjustments to the existing display panel manufacturing process, saving on the manufacturing cost of the inorganic insulating structure 5 and reducing the difficulty of the manufacturing process. Furthermore, since the pixel definition layer 10 is an organic film layer, the flexibility of the organic film ensures that the display panel has excellent mechanical properties.

[0042] The present embodiment does not limit the preparation process of the inorganic insulating layer 13, and those skilled in the art may select a process according to actual needs. For example, the inorganic insulating layer 13 may be prepared using chemical vapor deposition (CVD), low-temperature CVD, or atomic layer deposition (ALD) technology.

[0043] As a preferred embodiment, the inorganic insulating layer 13 can be formed by low-temperature CVD or ALD technology. The inorganic insulating layer 13 formed by these two processes has good density; and the thickness of the inorganic insulating layer 13 can be made very thin by using ALD technology, which is not much different from the film thickness when the inorganic insulating layer 13 is not set, which is beneficial to the adjustment of the overall thickness of the display panel.

[0044] The light emitting direction of the display panel can be defined as the first direction X. In the embodiment of the present invention, the thickness d of the inorganic insulating layer 13 in the first direction X can be set to within the range.

[0045] Specifically, if the inorganic insulating layer 13 is deposited on the surface of the spacer 12, the thickness d of the inorganic insulating layer 13 in the first direction X can be controlled to be According to actual test results, when the inorganic insulating layer 13 is within this thinner thickness range, it can effectively suppress the lateral transmission of carriers (holes) in adjacent sub-pixel regions 2, thereby reducing the lateral leakage problem and not significantly affecting the thickness of the display panel.

[0046] Optional, Figure 2 and Figure 3In the illustrated embodiment, an inorganic insulating layer 13 is provided in any spacer region 3. In this case, along the extension direction of the substrate 1 plane, the inorganic insulating layer 13 can inhibit the lateral transport of carriers within any two adjacent sub-pixel regions 2 through the carrier transport layer 4. Furthermore, with this arrangement, the inorganic insulating layer 13 and the pixel definition layer 10 can be patterned using the same mask, eliminating the need to design new masks and significantly increasing manufacturing costs. Of course, in actual design, the placement of the inorganic insulating layer 13 is not limited to this. The following describes several possible arrangements for the placement of the inorganic insulating layer 13 on the substrate 1.

[0047] For example, Figure 4 A schematic structural diagram of another display panel provided by an embodiment of the present invention, Figure 5 for Figure 4 The cross-sectional structure diagram of the display panel along BB' is shown in FIG. Figure 4 and Figure 5 In a possible embodiment, the sub-pixel region 2 includes a first sub-pixel region 21, a second sub-pixel region 22, and a third sub-pixel region 23; among the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23, the second sub-pixel region 22 has the highest current efficiency; the spacer 12 includes a first sub-spacer 121, a second sub-spacer 122, and a third sub-spacer 123; the first sub-spacer 121 is located between the first sub-pixel region 21 and the second sub-pixel region 22, the second sub-spacer 122 is located between the second sub-pixel region 22 and the third sub-pixel region 23, and the third sub-spacer 123 is located between the first sub-pixel region 21 and the third sub-pixel region 23; the inorganic insulating layer 13 is located on a side of the first sub-spacer 121 close to the carrier transport layer 4 and on a side of the second sub-spacer 122 close to the carrier transport layer 4.

[0048] Specifically, if Figure 4 and Figure 5 As shown, in this embodiment, the sub-pixel area 2 can be divided into a first sub-pixel area 21, a second sub-pixel area 22, and a third sub-pixel area 23. The current efficiency of any two of the first sub-pixel area 21, the second sub-pixel area 22, and the third sub-pixel area 23 is different. It can be understood that when the luminescent colors of the sub-pixels are different, that is, the luminescent materials in the sub-pixel area 2 are different, the current efficiency of the sub-pixel area 2 is also different. Different current efficiency refers to the different sensitivity of the luminescent material to current. The higher the current efficiency, the higher the sensitivity of the luminescent material to current, and the sensitivity of the luminescent material to current is related to the difficulty of the sub-pixel area 2 being illuminated. When lateral leakage occurs in the carrier transport layer 4, the sub-pixel area 2 with a higher sensitivity of the luminescent material to current is more likely to be illuminated.

[0049] To address this phenomenon, in this embodiment, the inorganic insulating layer 13 can be provided only around the sub-pixel region 2 with higher current efficiency. Figure 4 and Figure 5 The spacer 12 of the pixel definition layer 10 can be divided into a first sub-spacer 121, a second sub-spacer 122, and a third sub-spacer 123. Along the extension direction of the plane where the substrate 1 is located, the first sub-spacer 121 is arranged between the first sub-pixel region 21 and the second sub-pixel region 22, the second sub-spacer 122 is arranged between the second sub-pixel region 22 and the third sub-pixel region 23, and the third sub-spacer 123 is arranged between the first sub-pixel region 21 and the third sub-pixel region 23. The second direction Y and the third direction Z can be defined to be parallel to the extension direction of the plane where the substrate 1 is located, and the second direction Y and the third direction Z intersect. Figure 4 FIG. 2 shows that the first sub-pixel region 21 , the second sub-pixel region 22 and the third sub-pixel region 23 are alternately arranged in sequence along the second direction Y, but the actual arrangement is not limited thereto. Figure 4 In this arrangement, the first sub-spacer 121, the second sub-spacer 122 and the third sub-spacer 123 are also alternately arranged along the second direction Y, and along the second direction Y, the first sub-spacer 121 and the second sub-spacer 122 are located on both sides of the second sub-pixel region 22 with the highest current efficiency.

[0050] Therefore, in this embodiment, the inorganic insulating layer 13 can be disposed only on the surfaces of the first sub-spacer 121 and the second sub-spacer 122. That is, the inorganic insulating layer 13 is deposited on the side of the first sub-spacer 121 close to the carrier transport layer 4 and the side of the second sub-spacer 122 close to the carrier transport layer 4. The inorganic insulating layer 13 does not need to be disposed on the surface of the third sub-spacer 123. This arrangement not only improves the color crosstalk problem between the sub-pixel regions 2 of different luminescent colors, but also reduces the material content of the inorganic insulating layer 13, simplifying the preparation process of the inorganic insulating layer 13.

[0051] Optional, Figure 6 A schematic structural diagram of another display panel provided by an embodiment of the present invention is shown. Figure 7 for Figure 6 The cross-sectional structure diagram of the display panel along CC' is shown in FIG. Figure 6 and Figure 7In another possible embodiment, the sub-pixel region 2 may include a first sub-pixel region 21, a second sub-pixel region 22, and a third sub-pixel region 23; among the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23, the second sub-pixel region 22 has the highest current efficiency; the spacer 12 includes a fourth sub-spacer 124, a fifth sub-spacer 125, and a sixth sub-spacer 126; the fourth sub-spacer 124 is located between the first sub-pixel region 21 and the second sub-pixel region 22, the fifth sub-spacer 125 is located between the second sub-pixel region 22 and the third sub-pixel region 23, and the sixth sub-spacer 126 is located between the first sub-pixel region 21 and the third sub-pixel region 23; the inorganic insulating layer 13 includes a first sub-inorganic insulating layer 131, a second sub-inorganic insulating layer 132 and a third sub-inorganic insulating layer 133; the first sub-inorganic insulating layer 131 is located on the side of the fourth sub-spacer 124 close to the carrier transport layer 4, the second sub-inorganic insulating layer 132 is located on the side of the fifth sub-spacer 125 close to the carrier transport layer 4, and the third sub-inorganic insulating layer 133 is located on the side of the sixth sub-spacer 126 close to the carrier transport layer 4; wherein, the thickness d1 of the first sub-inorganic insulating layer 131 in the first direction X is greater than or equal to the thickness d3 of the third sub-inorganic insulating layer 133 in the first direction X; the thickness d2 of the second sub-inorganic insulating layer 132 in the first direction X is greater than or equal to the thickness d3 of the third sub-inorganic insulating layer 133 in the first direction X, and the first direction X is the light emitting direction of the display panel.

[0052] Specifically, refer to Figure 6 and Figure 7In this embodiment, the sub-pixel region 2 can still be divided into a first sub-pixel region 21, a second sub-pixel region 22, and a third sub-pixel region 23. The first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23 are still alternately arranged along the second direction Y. Moreover, among the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23, the second sub-pixel region 22 has the highest current efficiency. In this embodiment, the spacer 12 can be divided into a fourth sub-spacer 124, a fifth sub-spacer 125, and a sixth sub-spacer 126. The fourth sub-spacer 124 is disposed between the first sub-pixel region 21 and the second sub-pixel region 22, the fifth sub-spacer 125 is disposed between the second sub-pixel region 22 and the third sub-pixel region 23, and the sixth sub-spacer 126 is disposed between the first sub-pixel region 21 and the third sub-pixel region 23. The fourth sub-spacer 124, the fifth sub-spacer 125, and the sixth sub-spacer 126 are arranged in the same manner as the first sub-spacer 121, the second sub-spacer 122, and the third sub-spacer 123 in the above embodiment. Along the second direction Y, the fourth sub-spacer 124 and the fifth sub-spacer 125 are located on both sides of the second sub-pixel region 22, which has the highest current efficiency. Unlike the above embodiment, in this embodiment, an inorganic insulating layer 13 can be disposed on the surfaces of the fourth sub-spacer 124, the fifth sub-spacer 125, and the sixth sub-spacer 126.

[0053] The inorganic insulating layer 13 disposed on the side of the fourth sub-spacer 124 close to the carrier transport layer 4 is defined as the first sub-inorganic insulating layer 131, the inorganic insulating layer 13 disposed on the side of the fifth sub-spacer 125 close to the carrier transport layer 4 is defined as the second sub-inorganic insulating layer 132, and the inorganic insulating layer 13 disposed on the side of the sixth sub-spacer 126 close to the carrier transport layer 4 is defined as the third sub-inorganic insulating layer 133. Figure 7 As shown in , the thickness d1 of the first sub-inorganic insulating layer 131 along the first direction X and the thickness d2 of the second sub-inorganic insulating layer 132 along the first direction X can be set to be different from the thickness d3 of the third sub-inorganic insulating layer 133 along the first direction X. Furthermore, the thickness d1 of the first sub-inorganic insulating layer 131 along the first direction X is set to be greater than or equal to the thickness d3 of the third sub-inorganic insulating layer 133 along the first direction X, while the thickness d2 of the second sub-inorganic insulating layer 132 along the first direction X is set to be greater than or equal to the thickness d3 of the third sub-inorganic insulating layer 133 along the first direction X. That is, the thicknesses of the first sub-inorganic insulating layer 131 and the second sub-inorganic insulating layer 132 are set to be greater, and the thickness of the third sub-inorganic insulating layer 133 is set to be smaller.

[0054] Disposing an inorganic insulating layer 13 between any two adjacent sub-pixel regions 2 in the first, second, and third sub-pixel regions 21, 22, and 23 can enhance the blocking effect on lateral carrier transport and further mitigate lateral leakage. Furthermore, as can be seen in the aforementioned embodiment, the second sub-pixel region 22 is more easily illuminated. Therefore, in this embodiment, the inorganic insulating layer 13 disposed on the surfaces of the fifth and fourth sub-spacers 125, 124 on either side of the second sub-pixel region 22 is thicker, further preventing carriers within the first and third sub-pixel regions 21, 23 from migrating into the second sub-pixel region 22, which could cause the second sub-pixel region 22 to accidentally illuminate.

[0055] The specific thicknesses of the first sub-inorganic insulating layer 131 , the second sub-inorganic insulating layer 132 and the third sub-inorganic insulating layer 133 are not limited in this embodiment of the present invention, and those skilled in the art may set them according to actual needs.

[0056] Optionally, in a possible embodiment, the first sub-pixel region 21 includes a red sub-pixel region, the second sub-pixel region 22 includes a green sub-pixel region, and the third sub-pixel region 23 includes a blue sub-pixel region.

[0057] Specifically, Figures 8 to 10 The current efficiency diagram of three sub-pixels with different luminous colors provided by the embodiment of the present invention is as follows: Figure 8 The current efficiency change curve of the red sub-pixel at different current densities, Figure 9 The current efficiency change curve of the green sub-pixel at different current densities, Figure 10 The current efficiency change curves of the blue sub-pixel at different current densities are as follows: Figures 8 to 10 As shown in FIG. 1 , the current efficiency of the green sub-pixel is greater than that of the red and blue sub-pixels. Therefore, in the embodiment of the present invention, the first sub-pixel region 21 can be set as a red sub-pixel region, the second sub-pixel region 22 can be set as a green sub-pixel region, and the third sub-pixel region 23 can be set as a blue sub-pixel region, with the green sub-pixel region having the highest current efficiency.

[0058] It should be noted that Figures 8 to 10 The current efficiency curves shown in the figure are obtained from actual testing of sub-pixel samples of different luminous colors. It can be seen that each figure shows at least two current efficiency curves, where each curve corresponds to the current efficiency changes of a test sample. For sub-pixels of the same luminous color, the current efficiency curves of different test samples are basically the same, indicating that the current efficiency test results in this application are relatively accurate, and the determination of the relative magnitude of the current efficiency of sub-pixels of different luminous colors is consistent with actual conditions.

[0059] Optional, can still refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 In some possible embodiments, the inorganic insulating layer 13 may be located on the side of any spacer 12 close to the carrier transport layer 4; or, the inorganic insulating layer 13 may be located on the side of the spacer 12 between any two adjacent sub-pixel regions 2 of different luminous colors close to the carrier transport layer 4.

[0060] Specifically, if Figures 2 and 3 As shown in the figure, an inorganic insulating layer 13 can be provided on one side of any spacer 12 close to the carrier transport layer 4, that is, the inorganic insulating layer 13 is located on the surface of the spacer 12 between any adjacent sub-pixel areas 2, to ensure that there is no leakage in different extension directions of the display panel.

[0061] Or, as Figure 6 and Figure 7 As shown in , an inorganic insulating layer 13 can be provided on the surface of the spacer 12 between any two adjacent sub-pixel regions 2 of different luminescent colors. No inorganic insulating layer 13 is required on the surface of the spacer 12 between sub-pixel regions 2 of the same luminescent color. Generally, lateral leakage between sub-pixel regions 2 of different luminescent colors significantly impacts the display effect. Providing an inorganic insulating layer 13 between sub-pixel regions 2 of different luminescent colors not only improves color crosstalk, but also reduces the material used for the inorganic insulating layer 13, thereby lowering manufacturing costs.

[0062] Optional, Figure 11 A schematic cross-sectional view of a display panel according to an embodiment of the present invention is provided. Figure 11 In a possible embodiment, the display panel may further include a pixel definition layer 10, which is arranged between the substrate 1 and the carrier transport layer 4. The pixel definition layer 10 includes a plurality of openings 11 and a plurality of spacers 12. The spacers 12 are located between any two adjacent openings 11. The plurality of openings 11 correspond to a plurality of sub-pixel areas 2. The spacers 12 are arranged in the spacer area 3. The inorganic insulating structure 5 is reused as the pixel definition layer 10.

[0063] Specifically, if Figure 11 As shown, in this embodiment, the display panel still includes a pixel definition layer 10 located between the substrate 1 and the carrier transport layer 4. The pixel definition layer 10 includes a plurality of openings 11 and a spacer 12 between any two adjacent openings 11. The openings 11 of the pixel definition layer 10 correspond to the sub-pixel regions 2, and the spacer 12 is located in the spacer region 3. Figure 2Unlike the illustrated embodiment, in this embodiment, the inorganic insulating structure 5 can be reused as the pixel definition layer 10. That is, the entire pixel definition layer 10 is directly formed from an inorganic material, and the spacer 12 of the pixel definition layer 10 is the inorganic insulating structure 5. In this arrangement, adjacent sub-pixel regions 2 are directly separated by the inorganic insulating structure 5, which defines multiple sub-pixel regions 2. Within the spacer region 3, the inorganic insulating structure 5 is disposed between the substrate 1 and the carrier transport layer 4.

[0064] When the inorganic insulating structure 5 is reused as a pixel definition layer 10, the preparation process of the display panel can be roughly described as follows: first, an anode layer 6 is deposited on one side of the substrate 1, and the anode layer 6 is etched to form a plurality of anodes arranged in an array; secondly, an inorganic pixel definition layer is deposited on the substrate 1, and the inorganic pixel definition layer is etched to form a plurality of openings 11 and a plurality of spacers 12, the anodes are exposed from the openings 11, each anode corresponds to a sub-pixel area 2, and any two adjacent anodes are separated by a spacer 12, and the spacer 12 constitutes the inorganic insulating structure 5; further, a carrier transport layer 4 is deposited on the side of the anode and the inorganic insulating structure 5 away from the substrate 1, and the carrier transport layer 4 covers all the anodes and the inorganic insulating structure 5; then, a luminescent material is deposited in the opening 11 to form a luminescent layer 7, and the luminescent layer 7 covers the carrier transport layer 4, and different luminescent materials are deposited in the sub-pixel areas 2 of different colors; and then an electron transport layer 8 and a cathode layer 9 are formed on the side of the luminescent layer 7 away from the carrier transport layer 4.

[0065] The inorganic insulating structure 5 is arranged in this way, which can simplify the manufacturing process of the display panel; and because the inorganic insulating structure 5 is located around any adjacent sub-pixel area 2, it can also ensure that there is no leakage in different extension directions of the display panel.

[0066] In addition, optionally, in this configuration, the thickness d4 of the inorganic insulating structure 5 in the first direction X can be controlled within within the range.

[0067] Specifically, in this embodiment, the thickness d4 of the inorganic insulating structure 5 can be Figure 3 The thickness of the pixel definition layer formed by the organic material in the embodiment shown is similar. According to the experimental results, the thickness d4 of the inorganic insulating structure 5 is controlled to be When the inorganic insulating structure 5 is within the range, it can not only ensure the spacing effect of the inorganic insulating structure 5 on adjacent sub-pixel regions 2, but also effectively suppress the lateral transmission of carriers in different sub-pixel regions 2, thereby greatly improving the color crosstalk phenomenon. Because the inorganic insulating structure 5 replaces the organic pixel definition layer and inorganic insulating layer 13 in the above embodiment, the overall thickness of the inorganic insulating structure 5 is relatively thin. In this case, the height of the display panel packaging area can be adjusted according to actual conditions.

[0068] When the inorganic insulating structure 5 is reused as the pixel definition layer 10 , the inorganic insulating structure 5 can be directly prepared using a conventional CVD process in an array process, which has a relatively simple preparation method and high preparation efficiency.

[0069] Figures 2 to 11 In the illustrated embodiment, the inorganic insulating structure 5 is a single-layer inorganic insulating material. In other possible embodiments, the inorganic insulating structure 5 may be composed of at least two stacked layers of inorganic insulating material.

[0070] For example, Figure 12 A schematic cross-sectional view of another display panel provided in an embodiment of the present invention is shown in FIG. Figure 12 As shown in , in a possible embodiment, the inorganic insulating structure 5 may include a first sub-inorganic insulating structure 51 and a second sub-inorganic insulating structure 52 stacked along a first direction X; the first sub-inorganic insulating structure 51 and the second sub-inorganic insulating structure 52 are made of different materials, and the first direction X is the light emitting direction of the display panel.

[0071] Specifically, refer to Figure 12 The inorganic insulating structure 5 may be composed of a first sub-inorganic insulating structure 51 and a second sub-inorganic insulating structure 52 , which are stacked along the first direction X. The first sub-inorganic insulating structure 51 and the second sub-inorganic insulating structure 52 are formed of different materials. The inorganic insulating structure 5 includes sub-inorganic insulating structures formed of two different inorganic materials, which can further enhance the insulating effect of the inorganic insulating structure 5 , that is, enhance the inhibitory effect of the inorganic insulating structure 5 on carrier transmission.

[0072] Optionally, the total thickness of the first inorganic sub-insulating structure 51 and the second inorganic sub-insulating structure 52 can be set by those skilled in the art according to actual needs, for example, it can be set to But it’s not limited to this.

[0073] Optionally, in a possible embodiment, the material of the inorganic insulating structure 5 includes silicon nitride and / or silicon oxide.

[0074] Among them, in the present application, when the inorganic insulating structure 5 is a single-layer inorganic insulating material, the inorganic insulating structure 5 can be formed using inorganic materials such as silicon nitride or silicon oxide; when the inorganic insulating structure 5 includes a first sub-inorganic insulating structure 51 and a second sub-inorganic insulating structure 52 arranged in a stacked manner, the first inorganic insulating structure 51 and the second sub-inorganic insulating structure 52 can be formed of silicon nitride and silicon oxide inorganic materials, respectively.

[0075] Optionally, in an embodiment of the present invention, the carrier transport layer 4 includes a hole injection layer; or the carrier transport layer 4 includes a hole transport layer; or the carrier transport layer 4 includes a hole injection layer and a hole transport layer stacked along a first direction X, and the first direction X is the light emitting direction of the display panel.

[0076] Specifically, the carrier transport layer 4 for transporting holes in the display panel generally includes a hole injection layer and a hole transport layer. The carrier transport layer 4 described in the embodiment of the present invention can be either a hole transport layer or a hole injection layer, or can include both a hole injection layer and a hole transport layer.

[0077] Based on the same concept, an embodiment of the present invention further provides a display device, Figure 13 A schematic structural diagram of a display device provided by an embodiment of the present invention is shown in FIG. Figure 13 As shown, the display device includes the display panel 100 provided by any embodiment of the present invention. The display device provided by the embodiment of the present invention includes all the technical features and corresponding beneficial effects of the display panel 100 provided by any embodiment of the present invention, which will not be described in detail here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and an in-vehicle display device, which is not limited in the embodiment of the present invention.

[0078] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: a substrate comprising a plurality of sub-pixel regions and a plurality of spacer regions, wherein the spacer region is located between any two adjacent sub-pixel regions; a carrier transport layer, disposed on one side of the substrate and located in the sub-pixel region and the spacer; an inorganic insulating structure, disposed in at least a portion of the spacer region and located on a side of the carrier transport layer close to the substrate; The device further includes a pixel definition layer disposed between the substrate and the carrier transport layer, the pixel definition layer including a plurality of openings and a plurality of spacers, the spacers being located between any two adjacent openings, the plurality of openings corresponding to the plurality of sub-pixel regions, and the spacers being disposed in the spacers; The inorganic insulating structure includes an inorganic insulating layer, and the inorganic insulating layer is located at least on a side of a portion of the spacer close to the carrier transport layer; The sub-pixel region includes a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region; among the first sub-pixel region, the second sub-pixel region has the highest current efficiency; The spacers include a fourth sub-spacer, a fifth sub-spacer, and a sixth sub-spacer; the fourth sub-spacer is located between the first sub-pixel region and the second sub-pixel region, the fifth sub-spacer is located between the second sub-pixel region and the third sub-pixel region, and the sixth sub-spacer is located between the first sub-pixel region and the third sub-pixel region; The inorganic insulating layer includes a first sub-inorganic insulating layer, a second sub-inorganic insulating layer and a third sub-inorganic insulating layer; the first sub-inorganic insulating layer is located on a side of the fourth sub-spacer close to the carrier transport layer, the second sub-inorganic insulating layer is located on a side of the fifth sub-spacer close to the carrier transport layer, and the third sub-inorganic insulating layer is located on a side of the sixth sub-spacer close to the carrier transport layer; Among them, the thickness of the first sub-inorganic insulating layer in the first direction is greater than the thickness of the third sub-inorganic insulating layer in the first direction; the thickness of the second sub-inorganic insulating layer in the first direction is greater than the thickness of the third sub-inorganic insulating layer in the first direction, and the first direction is the light emitting direction of the display panel.

2. The display panel according to claim 1, wherein: The first sub-pixel region includes a red sub-pixel region, the second sub-pixel region includes a green sub-pixel region, and the third sub-pixel region includes a blue sub-pixel region.

3. The display panel according to claim 1, wherein: The inorganic insulating layer is located on a side of any of the spacers close to the carrier transport layer; or, the inorganic insulating layer is located on a side of the spacer between any two adjacent sub-pixel regions of different luminous colors close to the carrier transport layer.

4. The display panel according to claim 1, wherein: The thickness of the inorganic insulating layer in the first direction is in the range of 10Å to 500Å; the first direction is the light emitting direction of the display panel.

5. The display panel according to claim 1, wherein: The device further includes a pixel definition layer disposed between the substrate and the carrier transport layer, the pixel definition layer including a plurality of openings and a plurality of spacers, the spacers being located between any two adjacent openings, the plurality of openings corresponding to the plurality of sub-pixel regions, and the spacers being disposed in the spacers; The inorganic insulating structure is reused as the pixel definition layer.

6. The display panel according to claim 5, wherein: The thickness of the inorganic insulating structure in the first direction is in the range of 500Å to 2000Å; the first direction is the light emitting direction of the display panel.

7. The display panel according to claim 1, wherein: The inorganic insulating structure includes a first sub-inorganic insulating structure and a second sub-inorganic insulating structure stacked along a first direction; the first sub-inorganic insulating structure and the second sub-inorganic insulating structure are made of different materials, and the first direction is the light emitting direction of the display panel.

8. The display panel according to claim 1, wherein: The material of the inorganic insulating structure includes silicon nitride and / or silicon oxide.

9. The display panel according to claim 1, wherein: The carrier transport layer includes a hole injection layer; or the carrier transport layer includes a hole transport layer; or the carrier transport layer includes a hole injection layer and a hole transport layer stacked along a first direction, and the first direction is the light emitting direction of the display panel.

10. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 9.

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