Display panel and display device

Abstract

The application provides a display panel and a display device. The display panel comprises a plurality of sub-pixels. Each sub-pixel comprises an anode, a light-emitting auxiliary layer, a light-emitting material layer and a cathode which are sequentially stacked. In at least one sub-pixel, a spacing layer is arranged between the light-emitting auxiliary layer and the anode. The lateral conductivity of the spacing layer is less than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel. Thus, the design of the spacing layer can improve the problem of lateral crosstalk between the sub-pixels.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) displays, as a potential next-generation display technology to replace liquid crystal displays, have attracted widespread attention due to the crosstalk problem among sub-pixels of different colors in their full-color displays. OLED displays contain multiple sub-pixels emitting different colors of light, and these sub-pixels have different turn-on voltages. In this situation, the current manufacturing process of OLED displays has limited precision, which can lead to some film layers of the sub-pixels overlapping. Thus, when the OLED display is operating, current crosstalk can occur between some sub-pixels due to film layer overlap, resulting in display defects. Summary of the Invention

[0003] A first aspect of this application provides a display panel. This display panel includes a plurality of sub-pixels. Each sub-pixel includes an anode, a light-emitting layer, and a cathode stacked sequentially. The light-emitting layer includes a light-emitting auxiliary layer and a light-emitting material layer, with the light-emitting auxiliary layer located between the anode and the cathode, and the light-emitting material layer located between the light-emitting auxiliary layer and the cathode. A spacer layer is disposed between the light-emitting auxiliary layer and the anode in at least one sub-pixel. The lateral conductivity of the spacer layer is less than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel.

[0004] In the above scheme, by setting a spacer layer with low lateral conductivity, there is a height difference between the light-emitting auxiliary layer in the sub-pixel where the spacer layer is located and the light-emitting auxiliary layer in the adjacent sub-pixel. This reduces the risk of partial overlap of the light-emitting auxiliary layers between adjacent sub-pixels or the thickness of partial overlap, thereby alleviating the problem of current crosstalk caused by the overlap of light-emitting auxiliary layers between adjacent sub-pixels.

[0005] In conjunction with the first aspect, in some embodiments, the thickness of the spacer layer is greater than the thickness of the light-emitting layer in the adjacent sub-pixel. Furthermore, the orthographic projection of the light-emitting layer in the sub-pixel with the spacer layer onto any plane perpendicular to the anode does not overlap with the orthographic projection of the light-emitting layer in the adjacent sub-pixel onto the same plane perpendicular to the anode.

[0006] In the above scheme, the thickness of the spacer layer is designed to prevent overlap between the light-emitting layers and / or light-emitting auxiliary layers of adjacent sub-pixels due to process precision issues, thereby improving the problem of lateral crosstalk between adjacent sub-pixels.

[0007] In conjunction with the first aspect, in some embodiments, in a sub-pixel with a spacer layer, the thickness of the spacer layer is an integer multiple of half the wavelength of the light emitted by the sub-pixel. For example, further, in a sub-pixel with a spacer layer, the thickness of the spacer layer is equal to half the wavelength of the light emitted by the sub-pixel.

[0008] In the above scheme, setting the spacer layer to an integer multiple of half the wavelength of its corresponding sub-pixel is beneficial for forming a microcavity structure in the sub-pixel, enhancing the resonance of the emitted light corresponding to the sub-pixel, thereby improving the luminous efficiency and color gamut of the sub-pixel.

[0009] In conjunction with the first aspect, in some embodiments, the smaller the wavelength of the light emitted by the sub-pixel, the thinner the corresponding light-emitting auxiliary layer of the sub-pixel.

[0010] In the above scheme, by setting the thickness of the light-emitting auxiliary layer corresponding to the sub-pixels that emit different colors of light, the emission peaks of different sub-pixels have ultra-narrow bandwidth emission spectra, thereby achieving better monochromatic effect for each sub-pixel and improving the display effect of the display panel.

[0011] In conjunction with the first aspect, in some embodiments, a sub-pixel with a spacer layer is adjacent to a sub-pixel with a light-emitting auxiliary layer having the largest thickness.

[0012] In the above scheme, setting an interlayer in the adjacent sub-pixels of the sub-pixel with the largest thickness of the light-emitting auxiliary layer can effectively reduce the surface area of ​​the channel for lateral current flow in the pixel, reduce the magnitude of the lateral current, and thus efficiently improve the problem of lateral current crosstalk in the display panel.

[0013] In conjunction with the first aspect, in some embodiments, a sub-pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. One first sub-pixel, one second sub-pixel, and one third sub-pixel constitute a pixel repetition unit. The wavelengths of light emitted by the first sub-pixel, second sub-pixel, and third sub-pixel decrease sequentially. Within the same pixel repetition unit, the center point of the third sub-pixel is located on the perpendicular bisector of the line connecting the center points of the first and second sub-pixels. At least one sub-pixel contains a spacer layer. Further, both the second and third sub-pixels contain spacer layers.

[0014] In the above scheme, the array arrangement based on subpixels sets a spacing layer in at least one subpixel or further sets a spacing layer in the second and / or third subpixels, which can prevent the occurrence of lateral crosstalk between all subpixels in the light-emitting pixel and / or the occurrence of lateral crosstalk between adjacent light-emitting pixels, thereby improving the display effect of the display panel.

[0015] In conjunction with the first aspect, in some implementations, in each sub-pixel, the distance from the anode to the cathode is an integer multiple of half the wavelength of the light emitted by the sub-pixel.

[0016] In the above scheme, the first sub-pixel, the second sub-pixel, and the third sub-pixel each form a corresponding microcavity, which can correspondingly enhance the brightness of the light emitted from sub-pixels with different preset light colors, and can also enable different monochromatic lights to achieve resonance enhancement, effectively improving the luminous efficiency and color gamut of the display device.

[0017] In conjunction with the first aspect, in some embodiments, the spacer layer is made of a hole transport material.

[0018] In the above scheme, the choice of spacer material reduces the energy level barrier between the hole transport layer and the light-emitting auxiliary layer, increases the mobility of holes migrating longitudinally from the hole transport layer to the light-emitting auxiliary layer, and thus improves the luminous efficiency of the display panel.

[0019] In conjunction with the first aspect, in some embodiments, each sub-pixel further includes a hole transport layer located between the light-emitting auxiliary layer and the anode. In sub-pixels with a spacer layer, the spacer layer is disposed between the light-emitting auxiliary layer and the hole transport layer, and the spacer layer is made of the same material as the hole transport layer.

[0020] In the above scheme, the material of the spacer layer is the same as the material of the hole transport layer corresponding to the sub-pixel. This not only improves the problem of lateral crosstalk between sub-pixels and adjacent sub-pixels, but also simplifies the production process and saves production costs.

[0021] A second aspect of this application provides a display device. This display device includes any of the display panels provided in the first aspect described above. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a display panel according to an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of a display panel according to another embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the structure of a display panel according to another embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the array distribution of multiple sub-pixels in a display panel of this application.

[0026] Figure 5 This is one embodiment of the present application Figure 4 A cross-sectional view of M1N1.

[0027] Figure 6 This is one embodiment of the present application Figure 4 Cross-sectional view of M2N2.

[0028] Figure 7 This is one embodiment of the present application Figure 4 Cross-sectional view of M3N3.

[0029] Figure 8 This is another embodiment of the present application. Figure 4 Cross-sectional view of M2N2.

[0030] Figure 9 This is another embodiment of the present application Figure 4 Cross-sectional view of M3N3.

[0031] Figure 10 This is a schematic diagram of the structure of a display panel according to another embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In OLED display panels, full-color display is achieved primarily through three sub-pixels: red (RED), green (G), and blue (BULE). In conventional OLEDs, RGB sub-pixels have independent pixel apertures, and different sub-pixels are separated by pixel delimiting layers. The emitting and auxiliary emitting layers of their respective sub-pixels are deposited using a f-milled metallographic membrane (FMM). However, due to factors such as FMM deposition precision and sub-pixel spacing, non-common layers of the sub-pixels, such as the emitting and auxiliary emitting layers, exhibit a certain degree of overlap. Furthermore, due to the characteristics of RGB emitting materials, the activation voltage of B is typically higher than that of G, and the activation voltage of G is higher than that of R. At low grayscale levels, a potential difference exists between RGB sub-pixels, and current propagates between sub-pixels through the overlapped non-common layers, resulting in crosstalk between sub-pixels (B→R and / or B→G and / or G→R), thus affecting the display effect.

[0034] In view of this, this application provides a display panel that improves the problem of lateral leakage current in the display panel by setting a spacer layer in the sub-pixels to block the current propagation path between adjacent sub-pixels. The display panel includes multiple sub-pixels, and each sub-pixel includes an anode, a light-emitting layer, and a cathode stacked sequentially. The light-emitting layer includes a light-emitting auxiliary layer and a light-emitting material layer, with the light-emitting auxiliary layer located between the anode and the cathode, and the light-emitting material layer located between the light-emitting auxiliary layer and the cathode. A spacer layer is set between the light-emitting auxiliary layer and the anode in at least one sub-pixel. The lateral conductivity of the spacer layer is less than that of the light-emitting auxiliary layer in the same sub-pixel. By setting a spacer layer with a lateral conductivity less than that of its light-emitting auxiliary layer in the same sub-pixel, a height difference exists between the light-emitting auxiliary layers of the sub-pixel and the adjacent sub-pixels, reducing the probability of overlap between non-common film layers (i.e., light-emitting auxiliary layers) between adjacent sub-pixels, and even preventing overlap between non-common film layers between adjacent sub-pixels, the probability of current flowing from sub-pixels with high startup voltage to sub-pixels with low startup voltage is reduced in the low gray stage of the display panel, thereby improving the lateral crosstalk problem of the display panel.

[0035] The embodiments of this application are illustrated below with reference to the accompanying drawings. It should be understood that there are various ways to implement this application, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and complete understanding of this application.

[0036] In at least one embodiment of this application, such as Figure 1As shown, the display panel includes multiple sub-pixels. Sub-pixels emitting red, green, and blue light are adjacent to each other; that is, sub-pixel G is adjacent to sub-pixels R and B, respectively. To improve the lateral leakage problem between adjacent sub-pixels, a spacer layer 51 is provided in sub-pixel G. Specifically, sub-pixel R includes an anode 1 and a cathode 4, a light-emitting auxiliary layer 21 corresponding to sub-pixel R disposed between anode 1 and cathode 4, and a light-emitting material layer 31 emitting red light disposed between the light-emitting auxiliary layer 21 and cathode 4. Sub-pixel B includes an anode 1 and a cathode 4, a light-emitting auxiliary layer 23 corresponding to sub-pixel B disposed between anode 1 and cathode 4, and a light-emitting material layer 33 emitting blue light disposed between the light-emitting auxiliary layer 23 and cathode 4. Sub-pixel G not only includes an anode 1 and a cathode 4, a light-emitting auxiliary layer 22 corresponding to sub-pixel G disposed between anode 1 and cathode 4, and a light-emitting material layer 32 emitting green light disposed between the light-emitting auxiliary layer 22 and cathode 4, but also includes a spacer layer 51 disposed between the light-emitting auxiliary layer 22 corresponding to sub-pixel G and anode 1. The spacer layer 51 creates a height difference between the light-emitting auxiliary layer 22 in sub-pixel G and the light-emitting auxiliary layer 21 in sub-pixel R and the light-emitting auxiliary layer 23 in sub-pixel B. This reduces the probability of overlapping of different light-emitting auxiliary layers in adjacent sub-pixels or the thickness of the overlapping film layer. It also reduces or blocks the current propagation path between sub-pixels G and R, and between sub-pixels G and B, thereby reducing the magnitude of lateral current propagation. This can improve the lateral current crosstalk problem between different sub-pixels, i.e. between sub-pixels G and R, and between sub-pixels G and B.

[0037] It should be understood that the spacer layer can be placed not only in sub-pixel G, but also in sub-pixel B or sub-pixel R, or in multiple pixels. For example, the spacer layer can be placed in sub-pixels R and G, or in sub-pixels B and G, or in three sub-pixels: R, G, and B. The specific design of the spacer layer can be selected based on the array arrangement of the sub-pixels in the display panel, thereby effectively improving the lateral crosstalk problem between different sub-pixels. Simultaneously, the design of the light-emitting auxiliary layer can reduce the energy level barrier between the spacer layer and the light-emitting layer, thereby improving the luminous efficiency of the sub-pixels. For example, the light-emitting auxiliary layer can be an electron blocking layer (EBL). The design of the light-emitting auxiliary layer can also be selected based on the specific requirements of the display panel, which will not be elaborated here.

[0038] By designing the thickness of the spacer layer, the height difference between non-common film layers, such as the light-emitting auxiliary layer and / or light-emitting material layer, in the anode-to-cathode direction between different sub-pixels can be directly affected, thereby influencing the magnitude of the lateral current between different sub-pixels. In some embodiments, the thickness of the spacer layer is greater than the thickness of the light-emitting layer in the adjacent sub-pixel. Further, the orthographic projection of the light-emitting layer in the sub-pixel with the spacer layer on any plane perpendicular to the anode does not overlap with the orthographic projection of the light-emitting layer in the adjacent sub-pixel on the same plane perpendicular to the anode. The thickness of the spacer layer is designed to be neither too small nor too large, so that there is a height difference between the light-emitting layer of the sub-pixel with the spacer layer and the light-emitting layer of its adjacent sub-pixel in the anode-to-cathode direction, and the orthographic projections of the light-emitting layers corresponding to different sub-pixels on the plane where the anode is located do not overlap. This reduces the probability of lateral crosstalk problems caused by overlapping film layers in the light-emitting layers of adjacent sub-pixels due to the precision of the vapor deposition process or the design of the spacing between sub-pixels, thus improving the lateral crosstalk problem between adjacent sub-pixels.

[0039] For example, such as Figure 1 As shown, the thickness of the spacer layer 51 in sub-pixel G, i.e., the length of the spacer layer 51 in the direction from anode 1 to cathode 4, is greater than the sum of the thicknesses of the light-emitting material layer 33 emitting blue light and its corresponding light-emitting auxiliary layer 23 in sub-pixel B, and also greater than the sum of the thicknesses of the light-emitting material layer 31 emitting red light and its corresponding light-emitting auxiliary layer 21 in sub-pixel R. Therefore, the spacer layer 51 in sub-pixel G creates height differences between the light-emitting layers (including the light-emitting auxiliary layer 21 and the light-emitting material layer 31) in sub-pixel R, the light-emitting layers (including the light-emitting auxiliary layer 22 and the light-emitting material layer 32) in sub-pixel G, and the light-emitting layers (including the light-emitting auxiliary layer 23 and the light-emitting material layer 33) in sub-pixel B in the direction from anode to cathode. Thus, even with issues of FMM process precision or pixel pitch, the height differences between the light-emitting layers of different sub-pixels reduce the probability of overlap between non-common film layers of different sub-pixels, thereby improving the current lateral crosstalk problem between sub-pixel G and sub-pixel R, and between sub-pixel G and sub-pixel B. Furthermore, the orthographic projections of the light-emitting auxiliary layer 22 and the light-emitting material layer 32 in the sub-pixel G with the spacer layer on any plane perpendicular to the anode 1 not only do not overlap with the orthographic projections of the light-emitting auxiliary layer 21 and the light-emitting material layer 31 in the sub-pixel R on any plane perpendicular to the anode 1, but also do not overlap with the orthographic projections of the light-emitting auxiliary layer 23 and the light-emitting material layer 33 in the sub-pixel B on any plane perpendicular to the anode 1. Therefore, the design of the thickness of the spacer layer 51 in the sub-pixel G can isolate the current propagation path between sub-pixels G and R, and between sub-pixels G and B, thus improving the lateral crosstalk problem between adjacent sub-pixels.

[0040] It should be understood that when setting spacing layers in other sub-pixels R and / or sub-pixels B, the above principles can also be followed, and the spacing layer thickness for different sub-pixels can be designed in combination with the size of the display panel and other requirements.

[0041] Besides designing the spacer layer from an angle that creates a height difference between the non-common film layers of adjacent sub-pixels to improve the display effect of the display panel, other design approaches can also be used to enhance the display effect. In some embodiments, in a sub-pixel with a spacer layer, the thickness of the spacer layer is an integer multiple of half the wavelength of the light emitted by the sub-pixel. For example, further, in a sub-pixel with a spacer layer, the thickness of the spacer layer is equal to half the wavelength of the light emitted by the sub-pixel. Setting the thickness of the spacer layer to an integer multiple of half the wavelength of the light emitted by its corresponding sub-pixel facilitates the formation of a microcavity structure in the sub-pixel, enhances the resonance of the light emitted by the sub-pixel, and thus improves the luminous efficiency and color gamut of the sub-pixel.

[0042] After introducing the placement of the spacer layer in different sub-pixels and the impact of its thickness on improving the lateral leakage current problem of the display panel, the next step will analyze the impact of the choice of spacer layer material on improving the performance and cost-effectiveness of the display panel. In some embodiments, the spacer layer material is a hole transport material. The choice of spacer layer material reduces the energy level barrier between the hole transport layer and the light-emitting auxiliary layer, increases the mobility of holes migrating vertically from the hole transport layer to the light-emitting auxiliary layer, and thus improves the luminous efficiency of the display panel.

[0043] In at least one embodiment, each sub-pixel further includes a hole transport layer located between the light-emitting auxiliary layer and the anode. In a sub-pixel with a spacer layer, the spacer layer is disposed between the light-emitting auxiliary layer and the hole transport layer, and the spacer layer is made of the same material as the hole transport layer. For example, Figure 1 As shown, sub-pixels R, B, and G are all provided with hole transport layers 6. Specifically, in sub-pixels R and B, the hole transport layers 6 are located between the light-emitting auxiliary layer 21 and the anode 1, or between the light-emitting auxiliary layer 23 and the anode 1, respectively. In sub-pixel G, which is provided with a spacer layer 51, the hole transport layer 6 is located between the spacer layer 51 and the anode 1, and the spacer layer 51 is made of the same material as the hole transport layer 6 in sub-pixel G. The scheme of providing a spacer layer 51 made of the same material as the corresponding hole transport layer 6 in sub-pixel G does not affect the vertical hole transport and improves the lateral crosstalk problem between adjacent sub-pixels, while also eliminating the need to develop materials for the spacer layer, thereby simplifying the production process and saving production costs.

[0044] Of course, improving the display effect of the display panel is not limited to the design of the spacer layer; it can also be considered from other aspects. For example, in at least one embodiment, such as... Figure 1 , Figure 2 and Figure 3 As shown, in the RGB pixels, each sub-pixel has a hole blocking layer 7 between the light-emitting material layer 31, light-emitting material layer 32, light-emitting material layer 33 and the cathode 4, which can improve the light-emitting efficiency of the display panel and thus improve the display effect.

[0045] It should be understood that the choice of spacer material is not limited to the material of hole transport layer. In order to meet the functional requirements of display panel, the material of hole transport layer can be doped or composited to obtain a material with new functions, and the spacer layer can be prepared using the material with new functions.

[0046] The above solutions all consider the design of the spacer layer from the perspective of sub-pixels as units. Next, we will consider how to design the spacer layer to effectively improve the lateral leakage problem of the display panel from the perspective of light-emitting pixels. Specifically, there are two situations.

[0047] In the first scenario, in some embodiments, multiple adjacent sub-pixels with different preset emission colors constitute a single emitting pixel, and at least two adjacent sub-pixels with different preset emission colors are located in the same group of emitting pixels. The design of setting a spacer layer in at least one sub-pixel within the same group of emitting pixels isolates the current propagation path between sub-pixels emitting different colors of light during the low grayscale phase, preventing current from flowing from the sub-pixel with a high activation voltage to the sub-pixel with a low activation voltage. This effectively improves the problem of lateral current crosstalk within the same sub-pixel.

[0048] For example, such as Figure 2As shown, the display panel includes two adjacent groups of RGB pixels, namely the first RGB pixel 8 and the second RGB pixel 9. In each group of pixels, sub-pixel G is adjacent to sub-pixel R and sub-pixel B, respectively, and sub-pixel B in the first RGB pixel 8 is adjacent to sub-pixel R in the second RGB pixel 9. In the first RGB pixel 8, not only is a spacer layer 51 set in sub-pixel G, but a spacer layer 52 is also set in sub-pixel B. In the second RGB pixel, a spacer layer 51 is set only in sub-pixel G. By designing the thickness of the spacer layer 51 and spacer layer 52 corresponding to different sub-pixels, the orthographic projections of the light-emitting layers of different sub-pixels in the first RGB pixel 8 and the second RGB pixel 9 on the plane perpendicular to the anode 1 do not overlap. This design not only prevents overlap between the non-common film layers (i.e., the light-emitting material layer and the light-emitting auxiliary layer) between the sub-pixel B with a high activation voltage and the sub-pixel G with a low activation voltage, and between the sub-pixel G with a low activation voltage and the sub-pixel R with an even lower activation voltage in the first RGB pixel 8 and the second RGB pixel 9, thus preventing the formation of a lateral current flow channel, but also prevents the formation of a lateral current flow channel between sub-pixel B in the first RGB pixel 8 and the sub-pixel R with the even lower activation voltage in the second RGB pixel 9. Therefore, this solution not only improves the lateral leakage problem between different sub-pixels in the same pixel, but also improves the lateral leakage problem between adjacent pixels.

[0049] It should be understood that, within adjacent RGB pixels, such as between the first and second RGB pixels, the design scheme of the spacing layer in each luminescent pixel is not limited to... Figure 2 The design of the spacer layers in each luminescent pixel can be the same or different, depending on the specific requirements of the display panel. Furthermore, the number of spacer layers in each pixel is not limited to the above. Figure 2 You can set one or two, or even three, in the display panel array, depending on the specific array layout.

[0050] The second scenario: In some embodiments, multiple adjacent sub-pixels with different emitted light colors constitute a single emitting pixel. At least two adjacent sub-pixels with different emitted light colors are located in two adjacent groups of emitting pixels. A spacer layer is provided in at least one adjacent sub-pixel within an adjacent emitting pixel, preventing the non-common film layers between adjacent pixels from overlapping, thus preventing the formation of a lateral current flow channel. In other words, the current from a sub-pixel with a high activation voltage in one pixel cannot flow to an adjacent sub-pixel with a low activation voltage in an adjacent pixel, thereby solving the problem of lateral current crosstalk between adjacent pixels.

[0051] For example, such as Figure 3As shown, the display panel includes at least two sets of adjacent RGB pixels, namely, the first RGB pixel 8 and the second RGB pixel 9. In each set of pixels, sub-pixel G is adjacent to sub-pixel R and sub-pixel B, respectively. Sub-pixel B in the first RGB pixel 8 is adjacent to sub-pixel R in the second RGB pixel 9. Sub-pixel B in the first RGB pixel 8 has a spacer layer 52, and sub-pixel R in the second RGB pixel 9 has a spacer layer 53. In addition to effectively improving the lateral leakage problem between adjacent pixels, it can also improve the lateral leakage problem between sub-pixels within the same pixel. That is, in the second RGB pixel 9, the spacer layer 53 in the sub-pixel R prevents the light-emitting auxiliary layer 21 in the sub-pixel R from overlapping with the light-emitting auxiliary layer 22 and the light-emitting material layer 32 of the adjacent sub-pixel G. Consequently, the light-emitting material layer 31 in the sub-pixel R also cannot overlap with the light-emitting auxiliary layer 22 and the light-emitting layer 32 of the adjacent sub-pixel G, thus blocking the channel for current to flow from the sub-pixel G to the sub-pixel R. In the first RGB pixel 8, a spacer layer 52 in sub-pixel B blocks the current flow from sub-pixel B to the adjacent sub-pixel G. Furthermore, to effectively improve the lateral leakage problem of the display panel, a spacer layer 51 is provided in each sub-pixel G, which can respectively block the lateral current path between sub-pixel G and adjacent sub-pixel R, and between sub-pixel B and adjacent sub-pixel G, thereby further improving the display effect of the display panel.

[0052] In some embodiments, the smaller the wavelength of light emitted by a sub-pixel, the thinner the corresponding light-emitting auxiliary layer of the sub-pixel. This enables ultra-narrow bandwidth emission spectra of different sub-pixels, thereby achieving better monochromatic performance for each sub-pixel and improving the display effect of the display panel.

[0053] In some embodiments, a sub-pixel with a spacer layer is adjacent to a sub-pixel with the thickest light-emitting auxiliary layer. The thicker the light-emitting auxiliary layer, the stronger its lateral conductivity, meaning it provides a wider current path. Therefore, by setting a spacer layer in the sub-pixel adjacent to the sub-pixel with the thickest light-emitting auxiliary layer, the total area of ​​the lateral current flow path in the pixel can be effectively reduced, thereby efficiently improving the problem of lateral current crosstalk in the display panel.

[0054] For example, such as Figure 1 or Figure 2 As shown, in RGB pixels, the sub-pixel R with the longest emitted light wavelength has the thickest corresponding light-emitting auxiliary layer 21, while the sub-pixel B with the shortest emitted light wavelength has the thinnest corresponding light-emitting auxiliary layer 23. Figure 2As shown, in the sub-pixels adjacent to sub-pixel R in the second RGB pixel 9, specifically, sub-pixel G in the second RGB pixel 9 and sub-pixel B in the first RGB pixel 8 can both be provided with a spacer layer 51 or a spacer layer 52. This cuts off the light-emitting auxiliary layer 21 of the widest part of the lateral current flow channel in the display panel, namely the sub-pixel R in the second RGB pixel 9, thus effectively improving the lateral crosstalk problem in the display panel.

[0055] In a display panel, the array arrangement of multiple sub-pixels directly affects the design effect of the spacer layer. In at least one embodiment, based on the above spacer layer design, the array arrangement of sub-pixels with different preset light-emitting colors is as follows: the sub-pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. One first sub-pixel, one second sub-pixel, and one third sub-pixel form a pixel repetition unit, and the wavelengths of the light emitted by the first sub-pixel, the second sub-pixel, and the third sub-pixel decrease sequentially. In the same pixel repetition unit, the center point of the third sub-pixel is located on the perpendicular bisector of the line connecting the center points of the first sub-pixel and the second sub-pixel, and at least one sub-pixel has a spacer layer. Further, the area ratio of the first sub-pixel, the second sub-pixel, and the third sub-pixel is 1:1:2. Further, both the second and third sub-pixels have spacers. By setting spacers in different sub-pixels according to different requirements of the display panel, the problem of lateral crosstalk in the display panel can be effectively improved without significantly affecting the size of the display panel.

[0056] For example, such as Figure 4 As shown, in the RGB pixel array, the first sub-pixel is sub-pixel R, the second sub-pixel is sub-pixel G, and the third sub-pixel is sub-pixel B. Specifically, the three sub-pixels are arranged such that sub-pixel G is above sub-pixel R, and sub-pixel R and sub-pixel G have the same width. Their wide edges are aligned, meaning the line connecting the endpoints of the wide edges of sub-pixel R and sub-pixel G coincides with the line connecting their long edges. This aligns the center point of sub-pixel R with the center point of sub-pixel G, meaning the line connecting the two center points is parallel to the line connecting the long edges of sub-pixel R and sub-pixel G. Furthermore, the area ratio of sub-pixel R to sub-pixel G to sub-pixel B is 1:1:2.

[0057] based on Figure 4 The array arrangement of subpixels in the display panel shown can be separated by a spacing layer in subpixel G and / or subpixel B. The following two schemes are mainly introduced.

[0058] Option 1: As Figure 5 , Figure 6 and Figure 7As shown, among all subpixels included in different groups of RGB pixels, the spacing layer 51 is set only in subpixel G. On the one hand, as... Figure 5 As shown, in adjacent RGB sub-pixels, namely the first RGB pixel 8 and the second RGB pixel 9, the spacer layer 51 in sub-pixel G of the first RGB pixel 8 separates the light-emitting auxiliary layer 22 and the light-emitting material layer 32 of sub-pixel G from the light-emitting layer of sub-pixel R of the second RGB pixel 9. The light-emitting layer of sub-pixel R includes its corresponding light-emitting auxiliary layer 21 and light-emitting material layer 31. In this way, the lateral current flow path in the adjacent first RGB pixel 8 and second RGB pixel 9 is broken, thus improving the lateral crosstalk problem in adjacent pixels. On the other hand, as Figure 6 and Figure 7 As shown, within the same RGB pixel, such as in the first RGB pixel 8 or the second RGB pixel 9, the spacer layer 51 in sub-pixel G completely separates its light-emitting layer (including the light-emitting auxiliary layer 22 and the light-emitting material layer 32) from the light-emitting layer (including the light-emitting auxiliary layer 21 and the light-emitting material layer 31) in the adjacent sub-pixel R, preventing lateral crosstalk between sub-pixel G and sub-pixel R. Simultaneously, the thickness of the light-emitting auxiliary layer 23 in sub-pixel B is the smallest, less than the thickness of the light-emitting auxiliary layer 22 in sub-pixel R. Therefore, the lateral current path between the light-emitting layer of sub-pixel B and the light-emitting layer of sub-pixel G is also interrupted. In summary, the path for lateral current flow within the same pixel is interrupted by the spacer layer 51 in sub-pixel G, improving the lateral crosstalk problem between different RGB sub-pixels within the same pixel, and also improving the lateral crosstalk problem between adjacent pixels.

[0059] Option 2: As Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown, among all the sub-pixels included in the pixel, only sub-pixel R does not have a spacer layer, that is, sub-pixel G has a spacer layer 51 and sub-pixel B has a spacer layer 52. This not only prevents the current in sub-pixel B in the first RGB pixel 8 from flowing laterally to sub-pixels R and G in the adjacent second RGB pixel 9, effectively improving the problem of lateral leakage between different pixels, but also makes the lateral leakage channel between the corresponding sub-pixels R, G and B in the same pixel, such as in the first RGB pixel 8 or the second RGB pixel 9, blocked. Therefore, it improves the lateral leakage problem between all sub-pixels, and thus improves the display effect of the display panel more efficiently.

[0060] It should be understood that, based on Figure 4The display panel's spacing layer scheme is not limited to the first and second schemes mentioned above. Other schemes can be set according to the production needs of the display panel. For example, a spacing layer can be set only in sub-pixel R or a spacing layer can be set in sub-pixel R, sub-pixel G, and sub-pixel B.

[0061] This embodiment also considers other aspects to improve the display effect of the display panel. In some embodiments, in each sub-pixel, the distance from the anode to the cathode is an integer multiple of half the wavelength of the light emitted by the sub-pixel. This allows each sub-pixel to form a corresponding microcavity, which can correspondingly enhance the brightness of the light emitted by sub-pixels with different preset light colors, and can also enable different monochromatic lights to achieve resonance enhancement, effectively improving the luminous efficiency and color gamut of the display device.

[0062] For example, such as Figure 1 As shown, in an RGB pixel, the first sub-pixel is sub-pixel R, the second sub-pixel is sub-pixel G, and the third sub-pixel is sub-pixel B. The microcavity structures corresponding to the three sub-pixels have different vertical heights based on the half-wavelength of the light they emit, meaning the three sub-pixels have different heights in the direction from the anode 1 to the cathode 4. Specifically, sub-pixels R and B form a second-order microcavity, while in sub-pixel G, the thickness of the spacer layer 51 between the light-emitting auxiliary layer 22 and the hole transport layer 6 is an integer multiple of the half-wavelength of green light. This spacer layer 51, together with the light-emitting auxiliary layer 22 and the light-emitting material layer 32 corresponding to sub-pixel G, forms a third-order microcavity. In this design, although the spacer layer 51 in sub-pixel G changes the original RGB microcavity structure of the pixel, it has little impact on its electrical properties.

[0063] It should be understood that the microcavity structure between different sub-pixels is not limited to the above-mentioned scheme. The thickness of the film layer between the anode and cathode in different sub-pixels can be adjusted according to the actual needs of the display panel.

[0064] In at least one embodiment, such as Figure 10 As shown, the display panel may further include other functional layers, such as a hole injection layer (HIL), an electron injection layer (EIL), an electron transport layer (ETL), and a CPL layer. The hole injection layer (HIL) is located between the anode 1 and the hole transport layer 6. The electron injection layer (EIL) is located between the cathode 4 and the hole blocking layer 7. The electron transport layer (ETL) is located between the electron injection layer (EIL) and the hole blocking layer 7. Further, the electron transport layer (EIL) is a Yb-containing film. A capping layer (CPL) is deposited on the cathode. This CPL layer can effectively block water and oxygen from the external environment, protecting the OLED display panel from water and oxygen corrosion. By designing the film layer structure of this display panel, the reliability of the display panel is improved.

[0065] It should be understood that the design of the functional layer of the display panel is not limited to the above scheme. The functional layer can be designed according to the actual needs of the display panel.

[0066] This embodiment also provides a display device. The display device includes any of the display panels described above.

[0067] For example, the display device provided in at least one embodiment of this application may further include a touch structure to provide touch functionality. For example, the touch structure may be a touch panel or a touch layer. The touch panel may be disposed on the display panel by bonding, for example, as the light-emitting side of the display panel. For example, the touch layer may be fabricated directly on the display panel (e.g., its encapsulation layer) to facilitate a thinner and lighter design of the display device (here, the touch layer and the display panel may be collectively referred to as a touch display panel or a touch screen).

[0068] For example, the display device in the embodiments of this application can be any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator.

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, It includes multiple sub-pixels, each sub-pixel including an anode, a light-emitting layer and a cathode stacked sequentially, wherein the light-emitting layer includes: A light-emitting auxiliary layer is located between the anode and the cathode, and A light-emitting material layer is located between the light-emitting auxiliary layer and the cathode; A spacer layer is provided between the light-emitting auxiliary layer and the anode in at least one of the sub-pixels. The lateral conductivity of the spacer layer is less than that of the light-emitting auxiliary layer in the same sub-pixel, and the thickness of the spacer layer is greater than that of the light-emitting layer in adjacent sub-pixels. In the sub-pixels with the spacer layer, the thickness of the spacer layer is an integer multiple of half the wavelength of the light emitted by the sub-pixel. The smaller the wavelength of the light emitted by the sub-pixel, the thinner the light-emitting auxiliary layer of the corresponding sub-pixel. The sub-pixel with the spacer layer is adjacent to the sub-pixel with the light-emitting auxiliary layer having the largest thickness.

2. The display panel according to claim 1, characterized in that, The orthographic projection of the light-emitting layer in the sub-pixel with the spacer layer onto any plane perpendicular to the anode does not overlap with the orthographic projection of the light-emitting layer in the adjacent sub-pixel onto any plane perpendicular to the anode.

3. The display panel according to claim 2, characterized in that, In the sub-pixel with the spacer layer, the thickness of the spacer layer is equal to half the wavelength of the light emitted by the sub-pixel.

4. The display panel according to claim 1, characterized in that, The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel. A first sub-pixel, a second sub-pixel, and a third sub-pixel form a pixel repetition unit. The wavelengths of the light emitted by the first sub-pixel, the second sub-pixel, and the third sub-pixel decrease sequentially. In the same pixel repetition unit, the center point of the third sub-pixel is located on the perpendicular bisector of the line connecting the center point of the first sub-pixel and the center point of the second sub-pixel. At least one of the sub-pixels is provided with the spacer layer.

5. The display panel according to claim 4, characterized in that, The second sub-pixel and the third sub-pixel both have the spacing layer.

6. The display panel according to claim 4, characterized in that, In each of the sub-pixels, the distance from the anode to the cathode is an integer multiple of half the wavelength of the light emitted by the sub-pixel.

7. The display panel according to claim 1, characterized in that, The spacer layer is made of a hole transport material.

8. The display panel according to claim 7, characterized in that, Each of the sub-pixels also includes a hole transport layer located between the light-emitting auxiliary layer and the anode; In the sub-pixel having the spacer layer, the spacer layer is disposed between the light-emitting auxiliary layer and the hole transport layer, and the spacer layer is made of the same material as the hole transport layer.

9. A display device, characterized in that, The display panel includes any one of claims 1-8.

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