CN115050800A - Display panel and display device - Google Patents

Abstract

The application provides a display panel and a display device. The display panel includes a plurality of sub-pixels. Each sub-pixel includes an anode, a light emission auxiliary layer, a light emitting material layer, and a cathode, which are sequentially stacked. In at least one sub-pixel, a spacer layer is disposed between the light-emission auxiliary layer and the anode. The lateral conductivity of the spacer layer is less than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel. This allows the spacer layer design to ameliorate the problem of lateral cross talk between sub-pixels.

Description

Display panels and display devices

technical field

The present application relates to the field of display technology, and in particular, to a display panel and a display device having the display panel.

Background technique

Organic Light Emitting Diode (OLED) display panel, as a next-generation display technology that may replace liquid crystal display, has also attracted extensive attention to the crosstalk problem of sub-pixels of different colors in its full-color display. In an OLED display panel, there are a plurality of sub-pixels that emit light with different colors, and the turn-on voltages of these sub-pixels are different. In this case, the precision of the current OLED display panel fabrication process is limited, which in turn leads to some film layers of the sub-pixels that may overlap each other. In this way, when the OLED display panel is operating, current crosstalk occurs between some sub-pixels due to overlapping film layers, resulting in poor display.

SUMMARY OF THE INVENTION

A first aspect of the present application provides a display panel. The display panel includes a plurality of sub-pixels. Each sub-pixel includes an anode, a light-emitting layer, and a cathode that are stacked in sequence. The light-emitting layer includes a light-emitting auxiliary layer and a light-emitting material layer, and the light-emitting auxiliary layer is located between the anode and the cathode, and the light-emitting material layer is 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 smaller than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel.

In the above solution, by providing a spacer layer with a small 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-pixels, reducing the adjacent sub-pixels. The risk of partial film layer overlap or the thickness of partial film layer overlap between the light emitting auxiliary layers between adjacent sub-pixels can alleviate the problem of current crosstalk caused by the overlapping light emitting auxiliary layers between adjacent sub-pixels.

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 adjacent sub-pixels. Further, the orthographic projection of the light-emitting layer in the sub-pixel provided 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 any plane perpendicular to the anode. .

In the above solution, the thickness of the spacer layer is designed to prevent the overlapping between the light-emitting layers and/or light-emitting auxiliary layers of adjacent sub-pixels due to process accuracy, thereby improving the improvement of adjacent different sub-pixels. There will be a problem of lateral crosstalk between them.

With reference to the first aspect, in some embodiments, in the sub-pixel provided with the spacer layer, the thickness of the spacer layer is an integer multiple of the half wavelength of the light emitted by the sub-pixel. For example, further, in the sub-pixel provided with the spacer layer, the thickness of the spacer layer is equal to the half wavelength of the light emitted by the sub-pixel.

In the above solution, setting the spacer layer to be an integral multiple of the half wavelength of the corresponding sub-pixel is conducive to forming a microcavity structure in the sub-pixel, enhancing the resonance of the emitted light corresponding to the sub-pixel, thereby improving the performance of the sub-pixel. Luminous efficiency and color gamut of sub-pixels.

With reference to the first aspect, in some embodiments, the smaller the wavelength of the light emitted by the sub-pixels, the thinner the thickness of the light-emitting auxiliary layer of the corresponding sub-pixels.

In the above scheme, by setting the thicknesses of the luminescent auxiliary layers corresponding to the sub-pixels that emit light of different colors, the emission spectra of the different sub-pixels have ultra-narrow bandwidths, so that the monochrome of each sub-pixel achieves a better effect, and then The display effect of the display panel has been improved.

In combination with the first aspect, in some embodiments, the sub-pixel provided with the spacer layer is adjacent to the sub-pixel with the light emitting auxiliary layer having the largest thickness.

In the above solution, the spacer layer is arranged in the adjacent sub-pixels of the sub-pixel with the largest thickness of the light-emitting auxiliary layer, which can effectively reduce the surface area of the channel in which the lateral current flows in the pixel, reduce the magnitude of the lateral current and effectively improve the display panel. the problem of current lateral crosstalk.

In combination with the first aspect, in some embodiments, the sub-pixel includes a first sub-pixel, a second sub-pixel and a third sub-pixel, and a first sub-pixel, a second sub-pixel and a 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 in turn. In the same pixel repeating unit, the center point of the third sub-pixel is located between the center point of the first sub-pixel and the second sub-pixel. On the vertical bisector of the line connecting the center points of the sub-pixels, and at least one sub-pixel is provided with a spacer layer. Further, a spacer layer is provided in both the second sub-pixel and the third sub-pixel.

In the above solution, the spacer layer is arranged in at least one subpixel based on the array arrangement of the subpixels, or the spacer layer is further arranged in the second subpixel and/or the third subpixel, which can prevent all the subpixels in the light-emitting pixel from interfering with each other. The occurrence of lateral crosstalk between adjacent light-emitting pixels and/or the occurrence of lateral crosstalk between adjacent light-emitting pixels improves the display effect of the display panel.

In conjunction with the first aspect, in some embodiments, in each subpixel, the distance from the anode to the cathode is an integer multiple of the half wavelength of light emitted by the subpixel.

In the above solution, the first sub-pixel, the second sub-pixel and the third sub-pixel respectively form corresponding micro-cavities, which can correspondingly increase the brightness of the light emitted by the sub-pixels with different preset light colors, and can also make different monochrome colors. The light achieves resonance enhancement, which effectively improves the luminous efficiency and color gamut of the display device.

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

In the above scheme, the selection of the spacer layer material reduces the energy level barrier between the hole transport layer and the light-emitting auxiliary layer, improves the mobility of holes in the longitudinal migration from the hole transport layer to the light-emitting auxiliary layer, and further improves the the luminous efficiency of the display panel.

In conjunction with the first aspect, in some embodiments, each subpixel further includes a hole transport layer located between the light emitting auxiliary layer and the anode. In the sub-pixel provided with the spacer layer, the spacer layer is provided 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.

In the above solution, the material of the spacer layer is the same as the material of the hole transport layer corresponding to the sub-pixel, which improves the problem of lateral crosstalk between the sub-pixel and adjacent sub-pixels, and also simplifies the production process and saves production. cost.

A second aspect of the present application provides a display device. The display device includes any one of the display panels provided in the first aspect.

Description of drawings

FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application.

FIG. 2 is a schematic structural diagram of a display panel according to another embodiment of the present application.

FIG. 3 is a schematic structural diagram of a display panel according to another embodiment of the present application.

FIG. 4 is a schematic diagram of an array distribution of a plurality of sub-pixels in a display panel of the present application.

FIG. 5 is a cross-sectional view of M ₁ N ₁ in FIG. 4 in an embodiment of the present application.

FIG. 6 is a cross-sectional view of M ₂ N ₂ in FIG. 4 in an embodiment of the present application.

FIG. 7 is a cross-sectional view of M ₃ N ₃ in FIG. 4 in an embodiment of the present application.

FIG. 8 is a cross-sectional view of M ₂ N ₂ of FIG. 4 in another embodiment of the present application.

FIG. 9 is a cross-sectional view of M ₃ N ₃ of FIG. 4 in another embodiment of the present application.

FIG. 10 is a schematic structural diagram of a display panel according to another embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the OLED display panel, full-color display is mainly achieved through three colors of red sub-pixels (RED for short R), green sub-pixels (GREEN for short G) and blue sub-pixels (BULE for short B). In a conventional OLED, RGB has independent pixel openings, different sub-pixels are separated by a pixel defining layer, and the light-emitting layer and the light-emitting auxiliary layer of the corresponding sub-pixels are evaporated by FMM. However, due to factors such as the FMM evaporation precision and the sub-pixel pitch, the non-common layers of the sub-pixels, such as the light-emitting layer and the light-emitting auxiliary layer, also have a certain degree of overlapping phenomenon. At the same time, due to the characteristics of RGB light-emitting materials, under normal circumstances, the turn-on voltage of B is higher than that of G, and the turn-on voltage of G is higher than that of R. In the low gray-scale state, RGB There is a potential difference between the sub-pixels, and the current will propagate between the sub-pixels through the non-common layers that are overlapped together, that is, forming sub-pixel B→sub-pixel R and/or sub-pixel B→sub-pixel G and/or sub-pixel G → crosstalk of sub-pixel R, thus affecting the display effect.

In view of this, an embodiment of the present application provides a display panel. By arranging a spacer layer in the sub-pixels, the current propagation paths between different adjacent sub-pixels are blocked, thereby improving the problem of lateral leakage in the display panel. The display panel includes a plurality of sub-pixels, and each sub-pixel includes an anode, a light-emitting layer and a cathode that are stacked in sequence. The light-emitting layer includes a light-emitting auxiliary layer and a light-emitting material layer, and the light-emitting auxiliary layer is located between the anode and the cathode, and the light-emitting material layer is 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 smaller than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel. By setting a spacer layer in the same sub-pixel whose lateral conductivity is smaller than that of the light-emitting auxiliary layer, there is a height difference between the sub-pixel and the light-emitting auxiliary layer between the adjacent sub-pixels, and the non-common communication between adjacent sub-pixels is reduced. The probability of overlap between the film layers, that is, the light-emitting auxiliary layer, even prevents the overlap between the non-common film layers between adjacent sub-pixels, thereby reducing the display panel in the low gray stage, and the current is controlled by the high startup voltage. The probability of sub-pixels flowing to sub-pixels with low startup voltages improves the lateral crosstalk problem of the display panel.

The embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that there may be various implementations of the present application, which should not be construed as being limited to the embodiments set forth herein, which are only for a more thorough and complete understanding of the present application.

In at least one embodiment of the present application, as shown in FIG. 1 , the display panel includes a plurality of sub-pixels, and sub-pixels emitting red, green and blue among the plurality of sub-pixels are adjacent to each other, that is, the sub-pixel G is respectively adjacent to the sub-pixel R and the sub-pixel B is adjacent. In order to improve the lateral leakage problem existing between adjacent sub-pixels, a spacer layer 51 is provided in the sub-pixel G. Specifically, the sub-pixel R includes an anode 1 and a cathode 4, a light-emitting auxiliary layer 21 corresponding to the sub-pixel R disposed between the anode 1 and the cathode 4, and a light-emitting red light emission disposed between the light-emitting auxiliary layer 21 and the cathode 4. Material layer 31 . The sub-pixel B includes an anode 1 and a cathode 4 , a light-emitting auxiliary layer 23 corresponding to the sub-pixel B disposed between the anode 1 and the cathode 4 , and a blue-emitting light-emitting material layer 33 disposed between the light-emitting auxiliary layer 23 and the cathode 4 . The sub-pixel G not only includes the anode 1 and the cathode 4, the light-emitting auxiliary layer 22 corresponding to the sub-pixel G disposed between the anode 1 and the cathode 4, and the light-emitting material for emitting green light disposed between the light-emitting auxiliary layer 22 and the cathode 4 The layer 32 further includes a spacer layer 51 disposed between the light-emitting auxiliary layer 22 corresponding to the sub-pixel G and the anode 1 . The spacer layer 51 makes the light-emitting auxiliary layer 22 in the sub-pixel G, the light-emitting auxiliary layer 21 in the sub-pixel R, and the light-emitting auxiliary layer 23 in the sub-pixel B have a height difference respectively, which reduces the different light-emitting auxiliary layers in adjacent sub-pixels. The probability of overlapping or the thickness of the film layer of the overlapping part reduces or blocks the current propagation path between sub-pixel G and sub-pixel R and the current propagation path between sub-pixel G and sub-pixel B, thereby reducing the lateral The size of the current propagation can further improve the lateral current crosstalk between different sub-pixels, that is, between the sub-pixel G and the sub-pixel R and between the sub-pixel G and the sub-pixel B.

It should be understood that the spacer layer may not only be arranged in the sub-pixel G, but also may be arranged only in the sub-pixel B or the sub-pixel R, or may be arranged in multiple pixels, for example, the spacer layer may be arranged in the sub-pixel R and the sub-pixel R. In the pixel G, either the spacer layer is provided in the sub-pixel B and the sub-pixel G, or in the three sub-pixels of the sub-pixel R, the sub-pixel G and the sub-pixel B. The specific design scheme of the spacer layer can be selected according to the array arrangement of the sub-pixels in the display panel, so as to effectively improve the problem of lateral crosstalk between different sub-pixels. Meanwhile, 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 light-emitting efficiency of the sub-pixel, for example, the light-emitting auxiliary layer is an electron blocking layer (EBL). The design of the light-emitting auxiliary layer can also be selected and designed according to the specific requirements of the display panel, which will not be repeated here.

By designing the thickness of the spacer layer, it can directly affect the height difference between the non-common film layers between different sub-pixels, such as the light-emitting auxiliary layer and/or the light-emitting material layer, in the direction from the anode to the cathode, thereby affecting the different sub-pixels. The magnitude of the lateral current between them. In some embodiments, the thickness of the spacer layer is greater than the thickness of the light-emitting layer in adjacent sub-pixels. Further, the orthographic projection of the light-emitting layer in the sub-pixel provided 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 any plane perpendicular to the anode. . The thickness of the spacer layer is designed, and the thickness of the spacer layer cannot be too small or too large, so that the light-emitting layer of the sub-pixel with the spacer layer and the light-emitting layer of the adjacent sub-pixel have a height in the direction from the anode to the cathode. Moreover, the orthographic projections of the light-emitting layers corresponding to different sub-pixels on the plane where the anode is located do not overlap, which can reduce the occurrence of light-emitting layers of adjacent sub-pixels due to the accuracy of the evaporation process or the design of the spacing between sub-pixels. The probability of the lateral crosstalk problem caused by overlapping of the film layers in the device improves the lateral crosstalk problem between adjacent different sub-pixels.

Exemplarily, as shown in FIG. 1 , the thickness of the spacer layer 51 disposed in the sub-pixel G, that is, the length of the spacer layer 51 in the direction from the anode 1 to the cathode 4, is greater than that of the luminescent material layers 33 and 33 in the sub-pixel B that emit blue light. The sum of the thicknesses of the corresponding light-emitting auxiliary layers 23 is also greater than the sum of the thicknesses of the light-emitting material layers 31 and the corresponding light-emitting auxiliary layers 21 in the sub-pixel R emitting red light. It can be seen that the spacer layer 51 in the sub-pixel G makes the light-emitting layer in the sub-pixel R (including the light-emitting auxiliary layer 21 and the light-emitting material layer 31 ), the light-emitting layer in the sub-pixel G (including the light-emitting auxiliary layer 22 and the light-emitting material layer) 32) and the light-emitting layer (including the light-emitting auxiliary layer 23 and the light-emitting material layer 33) in the sub-pixel B respectively form a height difference in the direction from the anode to the cathode. Therefore, even in the presence of FMM process accuracy problems or pixel pitch problems Under the circumstance, the existence of the height difference between the light-emitting layers between the different sub-pixels also reduces the probability of overlapping between the non-common film layers between the different sub-pixels, thereby improving the relationship between the sub-pixel G and the sub-pixel R. The problem of current lateral crosstalk between and between sub-pixel G and sub-pixel B. Further, the orthographic projection of the light-emitting auxiliary layer 22 and the light-emitting material layer 32 in the sub-pixel G provided with the spacer layer on any plane perpendicular to the anode 1 is not only the same as that of the light-emitting auxiliary layer 21 and the light-emitting material layer 31 in the sub-pixel R. The orthographic projections on any plane perpendicular to the anode 1 do not overlap, and also do not intersect the orthographic projections of the light-emitting auxiliary layer 23 and the luminescent material layer 33 in the sub-pixel B on the plane perpendicular to the anode 1 stack. Therefore, the design of the thickness of the spacer layer 51 in the sub-pixel G can block the current propagation paths between the sub-pixel G and the sub-pixel R, and between the sub-pixel G and the sub-pixel B, thereby improving the gap between adjacent sub-pixels. The lateral crosstalk problem that arises.

It should be understood that when setting the spacer layer in other sub-pixels R and/or sub-pixels B, the above principles can also be followed, and the thickness of the spacer layer corresponding to different sub-pixels can be determined in combination with the size of the display panel and other requirements. the design of.

In addition to designing the spacer layer to improve the display effect of the display panel from the perspective of providing a height difference between the non-common film layers between adjacent sub-pixels, the spacer layer can also be designed to improve the display effect from other perspectives. In some embodiments, in a subpixel provided with a spacer layer, the thickness of the spacer layer is an integer multiple of the half wavelength of light emitted by the subpixel. For example, further, in the sub-pixel provided with the spacer layer, the thickness of the spacer layer is equal to the half wavelength of the light emitted by the sub-pixel. The thickness of the spacer layer is set to an integer multiple of the half wavelength of the light emitted by the corresponding sub-pixel, which is conducive to the formation of a microcavity structure in the sub-pixel, which can enhance the resonance of the light emitted by the sub-pixel, thereby improving the luminescence of the sub-pixel. Efficiency and color gamut.

After introducing the position of the spacer layer in different sub-pixels and the influence of its thickness setting on improving the lateral leakage of the display panel, the next step will be to analyze the effect of the selection of the material of the spacer layer on improving the performance of the display panel. and cost-effectiveness. In some embodiments, the material of the spacer layer is a hole transport material. The selection of the spacer layer material reduces the energy level barrier between the hole transport layer and the light-emitting auxiliary layer, improves the mobility of holes in the longitudinal migration from the hole transport layer to the light-emitting auxiliary layer, and thus improves the luminescence of the display panel. efficiency.

In at least one embodiment, each subpixel further includes a hole transport layer located between the light emitting auxiliary layer and the anode. In the sub-pixel provided with the spacer layer, the spacer layer is provided 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, as shown in FIG. 1 , the sub-pixel R, the sub-pixel B, and the sub-pixel R are all provided with the hole transport layer 6 . Specifically, in the sub-pixel R and the sub-pixel B, the hole transport layer 6 is 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, while in the sub-pixel G provided with the 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 the sub-pixel G. The scheme of setting the spacer layer 51 with the same material as the hole transport layer 6 in the sub-pixel G does not affect the vertical transport of holes and improves the lateral crosstalk between adjacent sub-pixels. At the same time, there is no need to develop space The material for preparing the layer is simplified, thereby simplifying the production process and saving the production cost.

Of course, improving the display effect of the display panel is not limited to the design of the spacer layer, but can also be considered from other aspects. For example, in at least one embodiment, as shown in FIG. 1 , FIG. 2 and FIG. A hole blocking layer 7 is provided between the luminescent material layer 31 , luminescent material layer 32 , luminescent material layer 33 and the cathode 4 corresponding to each sub-pixel, which can improve the luminous efficiency of the display panel and further improve the display effect.

It should be understood that the selection of the material of the spacer layer is not limited to the material of the hole transport layer. In order to meet the functional requirements of the display panel, processes such as doping or compounding can also be performed based on the material of the hole transport layer to obtain a hole transport layer. A new functional material is used to prepare the spacer layer.

The above are the solutions for designing the spacer layer from the perspective of sub-pixels as a unit. Next, from the perspective of light-emitting pixels, how to design the spacer layer can effectively improve the problem of lateral leakage of the display panel. Specifically, there are the following two situations.

Case 1: In some embodiments, a plurality of adjacent sub-pixels with different preset light colors constitute a light-emitting pixel, and at least two adjacent sub-pixels with different preset light colors are located in the same group of light-emitting pixels. The design of disposing a spacer layer in at least one sub-pixel in the same group of light-emitting pixels isolates the sub-pixels that pre-emit light of different colors from flowing from the sub-pixel with high startup voltage to the sub-pixel with low startup voltage in the low gray stage. The current propagation path can effectively improve the problem of current lateral crosstalk existing in the same sub-pixel.

Exemplarily, as shown in FIG. 2 , the display panel includes two adjacent groups of RGB pixels, namely a first RGB pixel 8 and a second RGB pixel 9, and the sub-pixel G in each group of pixels is in phase with the sub-pixel R and the sub-pixel B, respectively. and the sub-pixel B in the first RGB pixel 8 is adjacent to the sub-pixel R in the second RGB pixel 9 . In the first RGB pixel 8, not only the spacer layer 51 is provided in the sub-pixel G, but also the spacer layer 52 is provided in the sub-pixel B, while in the second RGB pixel, the spacer layer 51 is provided only in the sub-pixel G , and through the thickness design of the spacer layer 51 and spacer layer 52 corresponding to different sub-pixels, so that in the first RGB pixel 8 and the second RGB pixel 9, the light-emitting layers of different sub-pixels are perpendicular to the plane of the anode 1. Orthographic projections do not overlap. This design not only makes the first RGB pixel 8 and the second RGB pixel 9 between the sub-pixel B with a high startup voltage to the sub-pixel G with a low startup voltage, and the sub-pixel G with a low startup voltage to the sub-pixel G with a lower startup voltage The non-common film layers between the sub-pixels R, that is, the light-emitting material layer and the light-emitting auxiliary layer, are unlikely to have overlapping problems, so that a channel for lateral current flow cannot be formed, and the sub-pixel B in the first RGB pixel 8 is also connected to the first RGB pixel. In the two RGB pixels 9, the channel for the lateral current flow between the sub-pixels R with the lower start voltage cannot be formed. Therefore, this solution not only improves the lateral leakage problem between different sub-pixels in the same pixel, but also improves the adjacent Lateral leakage problem between pixels.

It should be understood that in adjacent RGB pixels, for example, in the first RGB pixel and the second RGB pixel, the design scheme of the spacer layer in each light-emitting pixel is not limited to that shown in FIG. The design scheme of the spacer layer in the light-emitting pixel can be the same or different, which can be designed according to the specific requirements of the display panel. Moreover, the number of spacer layers set in each pixel is not limited to one or two as shown in FIG. 2, but can also be set to three, which can be designed according to the specific array arrangement of the display panel.

The second case: In some embodiments, a plurality of adjacent sub-pixels with different pre-emitting light colors constitute one light-emitting pixel, and at least two adjacent sub-pixels with different light-emitting colors are located in two adjacent groups of light-emitting pixels. middle. A spacer layer is arranged in at least one adjacent sub-pixel of adjacent light-emitting pixels, so that the non-common film layer between adjacent pixels cannot be overlapped, that is, a channel for the lateral flow of current cannot be formed, that is, a pixel The current of a sub-pixel with a high startup voltage cannot flow into an adjacent sub-pixel with a low startup voltage in an adjacent pixel, thereby solving the problem of lateral current crosstalk between adjacent pixels.

Exemplarily, as shown in FIG. 3 , the display panel includes at least two groups of adjacent RGB pixels, namely a first RGB pixel 8 and a second RGB pixel 9, and the sub-pixel G in each group of pixels is connected to the sub-pixel R and the sub-pixel respectively. B is adjacent, and the sub-pixel B in the first RGB pixel 8 is adjacent to the sub-pixel R in the second RGB pixel 9, and the sub-pixel B in the first RGB pixel 8 is provided with a spacer layer 52, and the second RGB The sub-pixel R in the pixel 9 is provided with a spacer layer 53, which can not only effectively improve the lateral leakage problem between adjacent pixels, but also improve the lateral leakage problem between sub-pixels in the same pixel. That is, in the second RGB pixel 9, the spacer layer 53 provided 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, Furthermore, the light-emitting material layer 31 in the sub-pixel R cannot overlap with the light-emitting auxiliary layer 22 and the light-emitting layer 32 of the adjacent sub-pixel G, that is, the channel through which the current flows from the sub-pixel G to the sub-pixel R is blocked. In the first RGB pixel 8 , the spacer layer 52 provided in the sub-pixel B blocks the flow channel through which the current in the sub-pixel B flows into the adjacent sub-pixel G. In addition, in order to effectively improve the lateral leakage problem of the display panel, a spacer layer 51 is provided in the sub-pixel G in each pixel, which can separate the sub-pixel G from the adjacent sub-pixel R, and the sub-pixel B from the phase. The lateral current channel between adjacent sub-pixels G further improves the display effect of the display panel.

In some embodiments, the smaller the wavelength of the light emitted by the sub-pixel, the thinner the thickness of the light-emitting auxiliary layer of the corresponding sub-pixel. This enables the emission spectra of different sub-pixels to have ultra-narrow bandwidths, so that the monochromatic effect of each sub-pixel is better, thereby improving the display effect of the display panel.

In some embodiments, the sub-pixel provided with the spacer layer is adjacent to the sub-pixel with the light emitting auxiliary layer having the largest thickness. The thicker the light-emitting auxiliary layer, the stronger its lateral conductivity, that is to say, it provides a wider current channel. Therefore, disposing a spacer layer in the adjacent sub-pixels of the sub-pixel with the largest thickness of the light-emitting auxiliary layer can effectively The total area of the channel in which the lateral current flows in the pixel is reduced, thereby effectively improving the current lateral crosstalk problem of the display panel.

Exemplarily, as shown in FIG. 1 or FIG. 2 , in the RGB pixel, the sub-pixel R with the largest wavelength of the emitted light has the largest thickness of the light-emitting auxiliary layer 21, and the sub-pixel B with the smallest wavelength of the emitted light corresponds to The thickness of the light emitting auxiliary layer 23 is the smallest. As shown in FIG. 2 , in the sub-pixels adjacent to the sub-pixel R in the second RGB pixel 9, specifically, the sub-pixel G in the second RGB pixel 9 and the sub-pixel B in the first RGB pixel 8 can be The spacer layer 51 or the spacer layer 52 is provided, so that the light-emitting auxiliary layer 21 of the sub-pixel R in the second RGB pixel 9 is cut off at the part where the flow channel of the lateral current in the display panel is the widest, so it can effectively improve the Lateral crosstalk issues in display panels.

In the display panel, the array arrangement among the plurality of sub-pixels has a direct impact on the design effect of the spacer layer. In at least one embodiment, based on the above design of the spacer layer, the array arrangement of the sub-pixels with different preset light colors is as follows: the sub-pixels include a first sub-pixel, a second sub-pixel and a third sub-pixel, a first sub-pixel The pixel, a second sub-pixel and a third sub-pixel form a pixel repeating unit, and the wavelengths of the light emitted by the first sub-pixel, the second sub-pixel and the third sub-pixel decrease in turn. In the same pixel repeating unit, the The center points of the three sub-pixels are located on the vertical bisector of the line connecting the center point of the first sub-pixel and the center point of the second sub-pixel, and at least one sub-pixel is provided with 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, a spacer layer is provided in both the second sub-pixel and the third sub-pixel. According to different requirements of the display panel, disposing spacer layers in different sub-pixels can effectively improve the horizontal crosstalk problem of the display panel without having a great influence on the size of the display panel.

Exemplarily, as shown in FIG. 4 , in the RGB pixel, the first sub-pixel is the sub-pixel R, the second sub-pixel is the sub-pixel G, and the third sub-pixel is the sub-pixel B. Specifically, the array of three sub-pixels is arranged such that the sub-pixel G is above the sub-pixel R, and the widths of the sub-pixel R and the sub-pixel G are equal, and are aligned on the wide sides of the two sub-pixels, that is, the sub-pixel R and the sub-pixel G are The line connecting the endpoints of the broad side coincides with the line connecting the long sides of the sub-pixel R and the sub-pixel G, which makes the center point of the sub-pixel R aligned with the center point of the sub-pixel G, that is, the line connecting the two center points is the same as the sub-pixel G. The line connecting the long sides of the pixel R and the sub-pixel G is parallel. Further, the area of the sub-pixel R: the area of the sub-pixel G: the area of the sub-pixel B is 1:1:2.

Based on the array arrangement of the sub-pixels of the display panel shown in FIG. 4 , a spacer layer may be provided in the sub-pixel G and/or in the sub-pixel B, and the following two solutions are mainly introduced.

The first solution: as shown in FIG. 5 , FIG. 6 and FIG. 7 , among all the sub-pixels included in different groups of RGB pixels, the spacer layer 51 is provided only in the sub-pixel G. On the one hand, as shown in FIG. 5 , in the adjacent RGB sub-pixels, namely the first RGB pixel 8 and the second RGB pixel 9, the spacer layer 51 in the sub-pixel G in the first RGB pixel 8 makes the sub-pixel Both the light-emitting auxiliary layer 22 and the light-emitting material layer 32 of G are separated from the light-emitting layer of the sub-pixel R in the second RGB pixel 9, and the light-emitting layer of the sub-pixel R includes its corresponding light-emitting auxiliary layer 21 and light-emitting material layer 31, so that The channels through which the lateral current flows in the adjacent first RGB pixels 8 and the second RGB pixels 9 are disconnected, thus improving the lateral crosstalk problem in the adjacent pixels. On the other hand, as shown in FIG. 6 and FIG. 7 , in the same RGB pixel, for example, in the first RGB pixel 8 or the second RGB pixel 9, the spacer layer 51 provided in the sub-pixel G, the light-emitting layer (including The light-emitting auxiliary layer 22 and the light-emitting material layer 32) are completely separated from the light-emitting layers (including the light-emitting auxiliary layer 21 and the light-emitting material layer 31) in the adjacent sub-pixels R, preventing the lateral crosstalk between the sub-pixels G and the sub-pixels R. happened. At the same time, the thickness of the light-emitting auxiliary layer 23 of the sub-pixel B is the smallest, which is smaller than the thickness of the light-emitting auxiliary layer 22 of the sub-pixel R. Therefore, the lateral current channel between the light-emitting layer of the sub-pixel B and the light-emitting layer of the sub-pixel G is also is disconnected. In general, the channel for the flow of lateral current in the same pixel is disconnected by the spacer layer 51 provided in the sub-pixel G, which improves the lateral crosstalk between different sub-pixels RGB in the same pixel, and also improves the adjacent Lateral crosstalk between pixels.

The second solution: as shown in FIGS. 4 , 5 , 8 and 9 , among the sub-pixels included in all the pixels, only the sub-pixel R is not provided with a spacer layer, that is, the sub-pixel G is provided with a spacer layer 51 , the spacer layer 52 is arranged in the sub-pixel B, which can not only prevent the current in the sub-pixel B in the first RGB pixel 8 from flowing to the sub-pixel R and sub-pixel G in the adjacent second RGB pixel 9 in the lateral direction, The problem of lateral leakage between different pixels is effectively improved, and in the same pixel, for example, in the first RGB pixel 8 or the second RGB pixel 9, the corresponding sub-pixel R, sub-pixel G and sub-pixel B are between The channel of the lateral leakage current is cut off, thus improving the lateral leakage problem between all sub-pixels, thereby improving the display effect of the display panel more efficiently.

It should be understood that, based on the display panel of FIG. 4 , the solution of the spacer layer is not limited to the above-mentioned first solution and the second solution, and other solutions can be set according to the production requirements of the display panel, for example, only in the sub-pixel R A spacer layer is provided or is provided in all of the sub-pixel R, the sub-pixel G, and the sub-pixel B.

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 the half wavelength of the light emitted by the sub-pixel. This enables a corresponding microcavity to be formed in each sub-pixel, which can correspondingly improve the brightness of the light emitted by the sub-pixels with different preset light colors, and also enables different monochromatic lights to achieve resonance enhancement, effectively improving the luminous efficiency of the display device. and color gamut.

Exemplarily, as shown in FIG. 1 , 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, and the micro-cavity structure corresponding to the three sub-pixels is Different longitudinal heights are set according to their respective half wavelengths of emitted light, that is, the heights of the three sub-pixels in the direction from the anode 1 to the cathode 4 are different. Specifically, the sub-pixel R and the sub-pixel B form a second-order microcavity, and in the sub-pixel G, the thickness of the spacer layer 51 disposed between the light-emitting auxiliary layer 22 and the hole transport layer 6 is a half-wavelength integer of green light times, the spacer layer 51, the light-emitting auxiliary layer 22 and the light-emitting material layer 32 corresponding to the sub-pixel G form a third-order microcavity. In this design, although the spacer layer 51 provided in the sub-pixel G changes the original RGB microcavity structure in the pixel, it has little influence on its electrical properties.

It should be understood that the microcavity structure between different sub-pixels is not limited to the above solution, and the thickness of the film layer between the anode and the cathode in different sub-pixels can be adjusted according to the actual requirements of the display panel.

In at least one embodiment, as shown in FIG. 10 , 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 , and further, the electron transport layer EIL is a film layer containing Yb. A capping layer (CPL) layer is evaporated on the cathode, the CPL layer can effectively block water and oxygen in the external environment, and protect the OLED display panel from water and oxygen erosion. By designing the film layer structure of the display panel, the reliability of the display panel is improved.

It should be understood that the design of the functional layer of the display panel is not limited to the above solution, and the functional layer of the display panel can be designed according to the actual requirements of the display panel.

This embodiment also provides a display device. The display device includes any one of the above-mentioned display panels.

For example, the display device provided by at least one embodiment of the present application may further include a touch control structure so as to have a touch control function. For example, the touch structure may be a touch panel or a touch layer, and the touch panel may be disposed on the display panel by lamination, for example, disposed on the light-emitting side of the display panel. For example, the touch layer can be directly prepared on the display panel (for example, the encapsulation layer it includes), so as to facilitate the display device (herein, the touch layer and the display panel may be collectively referred to as a touch display panel or a touch display panel). Thin and light design.

For example, the display device in the embodiment of the present application may be any product or component with a display function, such as a TV, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, and a navigator.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A display panel, comprising a plurality of sub-pixels, each of the sub-pixels comprising an anode, a light-emitting layer and a cathode that are stacked in sequence, wherein the light-emitting layer comprises: a light-emitting auxiliary layer between the anode and the cathode, and a 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 of the sub-pixels, and the lateral conductivity of the spacer layer is smaller than the lateral conductivity of the light-emitting auxiliary layer in the same sub-pixel. 2 . The display panel according to claim 1 , wherein the thickness of the spacer layer is greater than the thickness of the light-emitting layer in the adjacent sub-pixels; 3 . Preferably, the orthographic projection of the light-emitting layer in the sub-pixel provided with the spacer layer on any plane perpendicular to the anode is the same as that of the light-emitting layer in the adjacent sub-pixel on any of the planes perpendicular to the anode. Orthographic projections on a plane perpendicular to the anode do not overlap. 3 . The display panel according to claim 2 , wherein, in the sub-pixels provided with the spacer layer, the thickness of the spacer layer is an integer multiple of a half wavelength of light emitted by the sub-pixels; 4 . Preferably, in the sub-pixel provided with the spacer layer, the thickness of the spacer layer is equal to the half wavelength of the light emitted by the sub-pixel. 4 . The display panel according to claim 3 , wherein the smaller the wavelength of the light emitted by the sub-pixels, the thinner the thickness of the light-emitting auxiliary layer of the corresponding sub-pixels. 5 . 5 . The display panel of claim 4 , wherein the sub-pixel provided with the spacer layer is adjacent to the sub-pixel having the light-emitting auxiliary layer having the largest thickness. 6 . 6 . The display panel according to claim 5 , wherein the plurality of sub-pixels comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and one of the first sub-pixel and one of the first sub-pixel Two sub-pixels and one of the third sub-pixels form a pixel repeating unit, and the wavelengths of light emitted by the first sub-pixel, the second sub-pixel and the third sub-pixel decrease in sequence, and the same one of the In the pixel repeating unit, the center point of the third sub-pixel is located on the vertical bisector of the line connecting the center point of the first sub-pixel and the center point of the second sub-pixel, and at least one of the sub-pixels is provided with the spacer layer; Preferably, the spacer layer is provided in both the second sub-pixel and the third sub-pixel. 7. The display panel according to claim 6, wherein, In each of the sub-pixels, the distance from the anode to the cathode is an integer multiple of a half wavelength of light emitted by the sub-pixel. 8 . The display panel according to claim 1 , wherein the material of the spacer layer is a hole transport material. 9 . 9. The display panel according to claim 8, wherein each of the sub-pixels further comprises a hole transport layer, the hole transport layer is located between the light emitting auxiliary layer and the anode; In the sub-pixel provided with 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 . 10. A display device, comprising the display panel according to any one of claims 1-9.

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