Display panel and display device

Abstract

The application provides a display panel and a display device, and relates to the technical field of display. The display panel comprises a plurality of pixel units, each of which comprises a plurality of sub-pixels with different preset light colors, and in at least one pixel unit, the excitation light of at least one sub-pixel comprises at least two peak wavelengths. By increasing the color gamut of the excitation light of the sub-pixel, the coverage of the color gamut of the display panel in the CIE-1931 chromaticity diagram is improved, so that the color performance of the display panel is improved, and the display effect of the display panel is improved.

Description

Technical Field

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

[0002] With the development of display technology, people have increasingly higher requirements for the color performance capabilities of display panels. Color gamut represents the range of colors a display panel can display; it is a direct reflection of the panel's color performance capabilities and an important parameter for evaluating its quality. Therefore, improving the color gamut of a display panel can enhance the visual experience and thus increase its market competitiveness. Summary of the Invention

[0003] The first aspect of this application provides a display panel comprising a plurality of pixel units, each pixel unit comprising a plurality of sub-pixels with different preset emission colors, wherein the excitation light of at least one sub-pixel in the pixel unit comprises at least two peak wavelengths.

[0004] In the above scheme, by increasing the wavelength range of the excitation light of the sub-pixel, the color gamut of the excitation light of the sub-pixel is improved, thereby improving the color gamut coverage of the display panel compared to the CIE-1931 chromaticity diagram, and thus improving the color performance capability of the display panel.

[0005] In conjunction with the first aspect, in some embodiments, in a sub-pixel having an excitation light having at least two peak wavelengths, the light-emitting layer of the sub-pixel includes at least two sub-light-emitting layers, and the peak wavelengths of the excitation light of the different sub-light-emitting layers are different.

[0006] In the above scheme, materials emitting the same color but with different peak wavelengths can be used to prepare different sub-emitting layers to achieve excitation light of the sub-pixel including at least two peak wavelengths. The process is simple and saves production costs. At the same time, the efficiency of exciton generation by recombination of holes and electrons in the sub-pixel with at least two sub-emitting layers is improved, thereby increasing its luminous efficiency.

[0007] In conjunction with the first aspect, in some embodiments, in a sub-pixel having at least two sub-emitting layers, the thickness of each sub-emitting layer is not equal, but the brightness is equal under the same driving voltage.

[0008] In the above scheme, by adjusting the thickness of the sub-emitting layer, the brightness of each sub-emitting layer is made equal under the same driving voltage, which makes it easier to control the light emission of each sub-emitting layer to meet the brightness requirements of the display panel for the sub-pixels.

[0009] In conjunction with the first aspect, in some embodiments, in a sub-pixel having at least two sub-emitting layers, each sub-emitting layer has the same thickness and different brightness under the same driving voltage.

[0010] In the above scheme, setting the thickness of each sub-emitting layer to be equal not only meets the brightness requirements of the display panel for the sub-pixels by controlling the input signals related to the luminance of different sub-emitting layers, but also simplifies the manufacturing process of at least two sub-emitting layers included in the sub-pixel, making the production and processing of the display panel easier and saving production costs.

[0011] In conjunction with the first aspect, in some implementations, the excitation light of all sub-pixels among the plurality of sub-pixels included in each pixel unit includes at least two peak wavelengths.

[0012] In the above scheme, the color gamut of all sub-pixels is improved, thereby further enhancing the color performance capability of the display panel.

[0013] In conjunction with the first aspect, in some embodiments, a portion of the sub-pixels of a pixel unit include excitation light comprising at least two peak wavelengths, while another portion of the sub-pixels include excitation light comprising one peak wavelength.

[0014] In the above scheme, the display panel can set the sub-pixels of a specific color among the sub-pixels with different preset light colors to have excitation light including at least two peak wavelengths, which can effectively improve the color gamut coverage of the display panel compared to the CIE-1931 chromaticity diagram.

[0015] In conjunction with the first aspect, in some embodiments, the pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the peak wavelength of the excitation light of the first sub-pixel is greater than the peak wavelength of the excitation light of the second sub-pixel, the peak wavelength of the excitation light of the second sub-pixel is greater than the peak wavelength of the excitation light of the third sub-pixel, and the excitation light of the second sub-pixel includes at least two peak wavelengths. Further, the color of the excitation light of the first sub-pixel is red, the color of the excitation light of the second sub-pixel is green, and the color of the excitation light of the third sub-pixel is blue.

[0016] In the above scheme, the excitation light of the second sub-pixel (the one with the middle peak wavelength among the three sub-pixels of the display panel) that emits a specific color excitation light includes at least two peak wavelengths, effectively improving the color performance of the display panel. Furthermore, the wavelength range of green light, which is most easily perceived by the human eye, is increased, thereby further enhancing the user's visual experience.

[0017] In conjunction with the first aspect, in some embodiments, in a sub-pixel whose excitation light includes a peak wavelength, the emissive layer includes at least two sub-emissive layers, and the peak wavelengths of the excitation light of the at least two sub-emissive layers are the same.

[0018] In the above scheme, the light-emitting layer of the display panel is set to at least two layers, and the efficiency of electrons and holes recombination in the light-emitting layer to generate excitons can be improved by lowering the energy level barrier, thereby improving the light-emitting efficiency of the display panel.

[0019] In conjunction with the first aspect, in some embodiments, in a sub-pixel whose excitation light includes a peak wavelength, the light-emitting layer of the sub-pixel is a single layer.

[0020] In the above scheme, the light-emitting layer of the sub-pixels that do not improve the color gamut is set as a single-layer structure, which facilitates the processing of the display panel and saves production process.

[0021] A second aspect of this application provides a display device, which includes a display panel according to any one of the first aspects described above. Attached Figure Description

[0022] Figure 1 This is a plan view of a display panel according to an embodiment of this application.

[0023] Figure 2 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0024] Figure 3 This refers to the color gamut coverage of a display panel according to an embodiment of this application relative to the CIE-1931 chromaticity diagram.

[0025] Figure 4 This is another embodiment of the present application showing the color gamut coverage of the display panel relative to the CIE-1931 chromaticity diagram.

[0026] Figure 5 This is a cross-sectional view of the display panel in another embodiment of this application.

[0027] Figure 6 This is a cross-sectional view of the display panel in another embodiment of this application.

[0028] Figure 7 This is a cross-sectional view of the display panel in another embodiment of this application.

[0029] Figure 8 This is a cross-sectional view of the display panel in another embodiment of this application.

[0030] Figure 9 This is a cross-sectional view of the display panel in one embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] This application provides a display panel comprising multiple pixel units, each pixel unit including multiple sub-pixels with different preset emission colors, and in at least one pixel unit, the excitation light of at least one sub-pixel includes at least two peak wavelengths. By designing the display panel such that the excitation light of at least one sub-pixel includes at least two peak wavelengths, the wavelength range of the excitation light of the sub-pixel is broadened, thereby increasing the color gamut of the excitation light of the sub-pixel. This improves the color gamut coverage of the display panel compared to the CIE-1931 chromaticity diagram, and consequently enhances the color performance capability of the display panel.

[0033] For example, such as Figure 1 and Figure 2 As shown, the display panel includes multiple pixel units 100, each pixel unit 100 including three sub-pixels with different preset emission colors, namely, a first sub-pixel 101, a second sub-pixel 102, and a third sub-pixel 103, arranged in an array. For example, the preset emission color of the first sub-pixel 101 is red, i.e., sub-pixel R (Red); the preset emission color of the second sub-pixel 102 is green, i.e., sub-pixel G (Green); and the preset emission color of the third sub-pixel 103 is blue, i.e., sub-pixel B (Blue). Furthermore, the excitation light of the second sub-pixel 102, i.e., sub-pixel G, includes two peak wavelengths, meaning that the green light emitted by the display panel has two peak wavelengths. (Refer to...) Figure 3 It is evident that, compared to the color gamut coverage of the CIE-1931 chromaticity diagram, the color gamut coverage of the sub-pixel display panel, which includes red, green, and blue, still needs improvement. (Refer to...) Figure 4 It can be seen that the improved display panel sets the sub-pixel G to emit light containing two peak wavelengths, which corresponds to... Figure 4 Compared to the original display panel, the improved display panel of this application has a larger color gamut, specifically G1 and G2. Figure 4 The area to the left of the dashed line, i.e. the area of ​​the triangle formed by points G1, G2 and B, represents the newly added color gamut of the display panel. This significantly improves the color gamut coverage of the display panel compared to the CIE-1931 chromaticity diagram, thereby enhancing the color display capability of the display panel.

[0034] It should be understood that the number of sub-pixels whose excitation light includes at least two peak wavelengths and the type of sub-pixels are not limited to the exemplary schemes described above. It is also possible that the excitation light of the first sub-pixel 101 or the second sub-pixel 102 includes at least two peak wavelengths. Furthermore, the number of sub-pixels in each pixel unit, the color corresponding to each sub-pixel, and the array arrangement are not limited to the exemplary schemes described above. For example, each pixel unit may include fewer than three or more than three sub-pixels, and their arrangement is designed according to the number of sub-pixels. For instance, each pixel unit may include four sub-pixels, namely sub-pixel R, sub-pixel G, sub-pixel B, and sub-pixel G, and the sub-pixels are arranged in a repeating RGBG unit. The arrangement unit of the sub-pixels is not limited to a linear structure. For example, the arrangement of sub-pixels may also be a triangular structure between the sub-pixels in the pixel unit, with this triangular structure as the repeating unit. These can all be designed according to the functional requirements of the display panel, and will not be elaborated upon here.

[0035] There are various ways to achieve excitation light of a sub-pixel having at least two peak wavelengths. In some embodiments, in a sub-pixel with excitation light having at least two peak wavelengths, the emissive layer of the sub-pixel includes at least two sub-emissive layers, and the peak wavelengths of the excitation light from different sub-emissive layers are different. Achieving excitation light with at least two peak wavelengths for a sub-pixel by setting at least two sub-emissive layers with excitation light having different peak wavelengths involves using materials that emit light of the same color but with different peak wavelengths to prepare different sub-emissive layers. This approach is simple and saves production costs. Furthermore, for a sub-pixel with at least two sub-emissive layers, compared to a sub-pixel with only one emissive layer, the energy level barrier between the emissive layers is lowered, thereby improving the efficiency of exciton generation through recombination of holes and electrons, i.e., improving the luminous efficiency of the sub-pixel.

[0036] For example, such as Figure 2 As shown, each pixel unit of the display panel includes a first sub-pixel 101 (sub-pixel R) with a preset emission color of red, a second sub-pixel 102 (sub-pixel G) with a preset emission color of green, and a third sub-pixel 103 (sub-pixel B) with a preset emission color of blue. Sub-pixel G includes two sub-emitting layers: a first sub-emitting layer 1021 (sub-emitting layer G1) and a second sub-emitting layer 1022 (sub-emitting layer G2). Both sub-emitting layers G1 and G2 have a preset emission color of green, but they emit light with different peak wavelengths. This results in the light emitted by sub-pixel G containing two peak wavelengths, thus broadening the wavelength range of green light and increasing the color gamut of the display panel, thereby improving its color rendering capability.

[0037] It should be understood that the first and second sub-emitting layers, i.e., sub-emitting layers G1 and G2, can be prepared using different green-emitting materials, or they can be prepared separately after doping the same green-emitting material to obtain materials with different peak wavelengths of green light for excitation. Furthermore, the method of achieving at least two peak wavelengths for the excitation light of a sub-pixel is not limited to the above-described exemplary schemes. For example, the emitting layer can be configured as a composite film layer with a coating or thin film structure between the layers that can change the wavelength of the light emitted from the emitting layer. These can all be designed according to the functional requirements and manufacturing process of the display panel, and will not be elaborated upon here.

[0038] The pixel unit of a display panel includes not only a light-emitting layer but also other film layer structures. In some embodiments, such as Figure 2 As shown, the pixel unit also includes an anode 104, a cathode 105, a hole transport layer 106, and an electron transport layer 107. These layers are shared by sub-pixels with different preset light-emitting colors. The light-emitting layers of different sub-pixels are located between the anode 104 and the cathode 105. The hole transport layer 106 is located between the anode 104 and the light-emitting layer. The electron transport layer 107 is located between the cathode 105 and the light-emitting layer.

[0039] It should be understood that the film structure of the pixel unit is not limited to the schemes in the above embodiments. For example, other film layers, such as a hole injection layer, can be disposed between the hole transport layer and the anode, and / or other film layers, such as an electron injection layer, can be disposed between the electron transport layer and the cathode. The specific structure of the pixel unit can be designed according to the functional requirements of the display panel, and will not be elaborated here.

[0040] The arrangement between sub-emitting layers with sub-pixels whose excitation light includes at least two peak wavelengths can be designed in conjunction with the requirements of the display panel and the manufacturing process.

[0041] In some implementations, in a sub-pixel having at least two sub-emitting layers, each sub-emitting layer has an equal thickness but unequal brightness under the same driving voltage. Setting each sub-emitting layer to have an equal thickness not only allows the brightness requirements of the display panel for the sub-pixel to be met by controlling the brightness-related input signals of different sub-emitting layers, but also simplifies the manufacturing process of sub-pixels containing at least two sub-emitting layers, facilitating the production and processing of the display panel and saving production costs.

[0042] For example, such as Figure 2As shown, the pixel unit of the display panel includes three sub-pixels with different preset light emission colors, namely sub-pixel R, sub-pixel G and sub-pixel B. Sub-pixel G is provided with two sub-emissive layers G1 and G2 with different peak wavelengths of excitation light. The thickness of sub-emissive layer G1 is equal to the thickness of sub-emissive layer G2, which facilitates the preparation of the light emission layer of sub-pixel G. However, since the light emission materials of the two are different, their light emission brightness is different under the same driving voltage. By controlling the input of the signal, the brightness of sub-pixel G can be made to meet the requirements of the display panel.

[0043] In some embodiments, in a sub-pixel having at least two sub-emitting layers, the thickness of each sub-emitting layer is unequal, but the brightness is equal under the same driving voltage. By adjusting the thickness of the sub-emitting layers, the brightness of each sub-emitting layer is made equal under the same driving voltage, which facilitates the control of the light emission of each sub-emitting layer to meet the brightness requirements of the display panel for the sub-pixel.

[0044] For example, such as Figure 5 As shown, in a single pixel unit of a display panel, there are three sub-pixels: sub-pixel R, sub-pixel G, and sub-pixel B. The emissive layer of sub-pixel G includes two sub-emissive layers with different peak wavelengths of excitation light: sub-emissive layer G1 and sub-emissive layer G2. The peak wavelength of sub-emissive layer G1 is greater than that of sub-emissive layer G2. To ensure equal brightness for both layers under the same driving voltage, the thickness of sub-emissive layer G1 is less than that of sub-emissive layer G2. This facilitates control over the brightness of the green light emitted by sub-pixel G, which includes sub-emissive layers G1 and G2, thus meeting the display panel's brightness requirements for green light.

[0045] It should be understood that the peak wavelengths of the excitation light of a sub-pixel are not limited to two, but can be three or more. Furthermore, the positional relationship between sub-light-emitting layers of different thicknesses, such as which is closer to the cathode and which is closer to the anode, is not limited to the above-described exemplary schemes. These can all be designed according to the functional requirements of the display panel, and will not be elaborated here.

[0046] Based on considerations such as market demand and / or production conditions and / or production costs, some or all or a specific one of the multiple sub-pixels with different preset light colors in the pixel unit of the display panel can be selectively set to excite light including at least two peak wavelengths to improve the color gamut of the display panel, thereby enhancing the market competitiveness of the display panel.

[0047] In some embodiments, the excitation light of all sub-pixels among the plurality of sub-pixels included in each pixel unit includes at least two peak wavelengths. All sub-pixels of the display panel with different preset emission colors are configured such that the excitation light includes at least two peak wavelengths, that is, the color gamut of all sub-pixels is improved, thereby further improving the color gamut coverage of the display panel relative to the CIE-1931 chromaticity diagram, and thus further improving the color performance capability of the display panel.

[0048] For example, such as Figure 6 As shown, the pixel unit includes sub-pixels, namely sub-pixels R, G, and B, which emit three different colors of light. Each sub-pixel's emissive layer includes two emissive layers with different peak wavelengths of excitation light. Specifically, sub-pixel R includes emissive layers R1 and R2 with different peak wavelengths of excitation light; sub-pixel G includes emissive layers G1 and G2 with different peak wavelengths of excitation light; and sub-pixel B includes emissive layers B1 and B2 with different peak wavelengths of excitation light. The wavelength range of the light emitted by each sub-pixel is increased, thereby improving the color gamut of each sub-pixel and thus efficiently improving the color gamut of the display panel.

[0049] It should be understood that the thickness relationship, peak wavelength relationship, and relative positional relationship between different sub-pixels, including sub-emitting layers with different excitation light peak wavelengths, can all be designed according to the functional requirements of the display panel, and will not be elaborated here.

[0050] In some embodiments, the light emitted by a portion of the sub-pixels comprising at least one pixel unit includes at least two dominant wavelengths (i.e., peak wavelengths), while the light emitted by another portion of the sub-pixels includes one dominant wavelength. The display panel can, according to color display requirements, configure sub-pixels of specific colors among sub-pixels with preset light-emitting colors to emit excitation light including at least two dominant wavelengths. This can efficiently improve the color gamut coverage of the display panel compared to the CIE-1931 chromaticity diagram, while simplifying the display panel's manufacturing process and saving production costs.

[0051] For example, such as Figure 7As shown, the pixel unit of the display panel includes a sub-pixel R that emits red light, a sub-pixel G that emits green light, and a sub-pixel B that emits blue light. Sub-pixels R and G each include sub-emitting layers with excitation light having two different peak wavelengths. Specifically, sub-pixel R includes sub-emitting layers R1 and R2 with different excitation light peak wavelengths, sub-pixel G includes sub-emitting layers G1 and G2 with different excitation light peak wavelengths, while the light emitted from the emitting layers of sub-pixel B has the same peak wavelength. This selectively enhances the color gamut of red and green light, that is, it selectively enhances the color gamut of the display panel in certain specific color ranges, thereby improving the display effect of the display panel.

[0052] It should be understood that the scheme of setting some sub-pixels to excite light including at least two peak wavelengths is not limited to sub-pixels R and G in the above example. It can also be a combination of sub-pixels R and B or a combination of sub-pixels G and B. This can be designed according to the specific color display requirements of the display panel, which will not be elaborated again.

[0053] In some embodiments, each pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. The peak wavelength of the excitation light of the first sub-pixel is greater than the peak wavelength of the excitation light of the second sub-pixel, the peak wavelength of the excitation light of the second sub-pixel is greater than the peak wavelength of the excitation light of the third sub-pixel, and the excitation light of the second sub-pixel includes at least two peak wavelengths. For a sub-pixel whose excitation light is a specific color, i.e., the second sub-pixel among the three sub-pixels in the display panel with the middle peak wavelength, the excitation light includes at least two peak wavelengths. This more efficiently improves the color gamut coverage of the display panel relative to the CIE-1931 chromaticity diagram, thereby improving the color performance capability of the display panel. Furthermore, by improving only one type of sub-pixel, production costs are further reduced.

[0054] In at least one embodiment, the excitation light of the first sub-pixel is red, the excitation light of the second sub-pixel is green, and the excitation light of the third sub-pixel is blue. The peak wavelength of the excitation light of the second sub-pixel is set to at least two colors, which increases the wavelength range of green light, which is most easily recognized by the human eye, thereby further improving the user's visual enjoyment.

[0055] For example, such as Figure 8As shown, the pixel unit of the display panel includes a sub-pixel R that emits red light, a sub-pixel G that emits green light, and a sub-pixel B that emits blue light. The peak wavelength of the red light emitted by sub-pixel R is greater than the peak wavelength of the green light emitted by sub-pixel G, and the peak wavelength of the green light emitted by sub-pixel G is greater than the peak wavelength of the blue light emitted by sub-pixel B. In the sub-pixel G, which is in the middle wavelength range, its emissive layer is configured to include two sub-emissive layers, namely sub-emissive layer G1 and sub-emissive layer G2, that emit green light with two peak wavelengths. By increasing the wavelength range of the green light emitted by the sub-pixel, the color gamut of the display panel is improved. Furthermore, since green light belongs to the middle band of visible light and can be more sensitively perceived by the human eye, setting the emissive layer of the green-emitting sub-pixel to emit light with at least two peak wavelengths can more effectively improve the color gamut of the display panel, enhance the user experience, and further reduce production costs.

[0056] The design of the light-emitting layer corresponding to different sub-pixels will also be different depending on factors such as the functional requirements and cost of the display panel.

[0057] In some embodiments, in a sub-pixel whose excitation light includes a peak wavelength, the emissive layer includes at least two sub-emissive layers, and the peak wavelengths of the excitation light from the at least two sub-emissive layers are the same. By configuring the emissive layer of the display panel as two layers, the efficiency of exciton generation through electron-hole recombination in the emissive layer can be improved, thereby increasing the luminous efficiency of the display panel.

[0058] For example, such as Figure 8 As shown, the pixel unit of the display panel includes a double-layer structure for the light-emitting layer of all sub-pixels, regardless of whether the excitation light of the sub-pixel contains at least two peak wavelengths. Specifically, a sub-pixel R whose excitation light contains only one peak wavelength includes two sub-light-emitting layers R1 with the same peak wavelength; a sub-pixel B whose excitation light contains only one peak wavelength includes two sub-light-emitting layers B1 with the same peak wavelength; and a sub-pixel G whose excitation light contains two peak wavelengths includes sub-light-emitting layers G1 and G2 with different peak wavelengths. The double-layer structure of the light-emitting layers corresponding to different colors emitted by the sub-pixels lowers the energy level barrier in the sub-pixels, thereby improving the recombination efficiency of holes and electrons in the light-emitting layers, thus improving the luminous efficiency of the display panel.

[0059] In some embodiments, in sub-pixels whose excitation light includes a peak wavelength, the emissive layer of the sub-pixel is a single layer. Setting the emissive layer of sub-pixels that do not improve color gamut to a single-layer structure facilitates the processing of the display panel and saves on manufacturing processes.

[0060] For example, such as Figure 2As shown, among the sub-pixels included in the display panel, only sub-pixels G whose excitation light contains two peak wavelengths are configured with a dual-layer structure, namely sub-emissive layer G1 and sub-emissive layer G2, and the peak wavelengths of the excitation light in the two sub-emissive layers are not equal. Meanwhile, the sub-pixels R and B, whose excitation light contains only one peak wavelength, have single-layer emissive layers. This design simplifies the manufacturing process of the display panel and saves production costs.

[0061] This application also describes how to obtain the mapping relationship between the brightness and input voltage of different sub-pixels of a display panel that includes sub-pixels with at least two peak wavelengths. Furthermore, to better understand the mapping relationship for the improved display panel, this application also provides an explanation of the mapping relationship between the brightness and input voltage of different sub-pixels of the original display panel, as detailed below.

[0062] Based on the original display panel, the excitation light of each sub-pixel in its pixel unit includes a single peak wavelength, and the light-emitting layer corresponding to the sub-pixel is a single layer. For example, Figure 9 The display panel shown has pixel units comprising multiple sub-pixels whose excitation light has only one peak wavelength, namely sub-pixels R, G, and B, and each sub-pixel corresponds to a single emissive layer. The manufactured display panel was tested to obtain the highest brightness of different sub-pixels, and the highest brightness of each sub-pixel was used to divide it into multiple gray levels, with different gray levels corresponding to different brightness levels. The process for determining the gray level brightness mapping relationship of this display panel is as follows:

[0063] Step S01: Complete the calibration of sub-pixel R, sub-pixel G and sub-pixel B.

[0064] Step S02: Measure the brightness of sub-pixels R, G, and B at 255 gray levels using optical measurement equipment such as a color analyzer CA310 or CA410.

[0065] Step S03: Adjust the Gamma based on the brightness of different sub-pixels to obtain the brightness curves of sub-pixels R, G, and B at different gray levels. Calculate the gray level variation curve of sub-pixel G with brightness using the brightness curves of sub-pixels R and B, and use the gray level variation curve of sub-pixel G with brightness as the lookup database.

[0066] For example, a screen's brightest point is 256 nits. This can be divided into 256 grayscale levels, from 0 to 255. Each grayscale level can be defined as 1 nit, meaning grayscale 0 corresponds to 1 nit, grayscale 1 to 2 nits, grayscale 2 to 3 nits, and so on. Grayscale 255 corresponds to 256 nits, representing the maximum brightness. Based on the Gamma calibration, the brightness corresponding to each grayscale level is obtained from the maximum brightness of 256 nits, resulting in 256 brightness levels for each of the 256 grayscale levels. These values ​​are then processed into a program and input into the display panel. Once the display panel is powered on, testing instruments are used to determine the required input voltage for each grayscale level displayed, i.e., the 256 input voltages for each of the 256 brightness levels. Therefore, the mapping relationship between the brightness of different sub-pixels of the display panel and the input voltage is obtained.

[0067] For the improved display panel, which includes sub-pixels with different peak wavelengths of excitation light, the relationship of its signal input is as follows.

[0068] For example, Figure 2 The display panel shown includes sub-pixels R, G, and B in its pixel units. The excitation light from sub-pixel G has two peak wavelengths, and its corresponding emissive layers are made of materials with two different peak wavelengths, namely sub-emissive layers G1 and G2. The process for determining the grayscale brightness mapping relationship of this display panel is as follows:

[0069] Step S001: First, complete the calibration of sub-pixel R, sub-pixel G and sub-pixel B.

[0070] Step S002: Measure the brightness of different sub-emissive layers (i.e., sub-emissive layer G1, sub-emissive layer G2, and sub-pixel B) of sub-pixel R and sub-pixel G at 255 gray levels using optical measurement equipment such as color analyzer CA310 or color analyzer CA410.

[0071] Step S003: Adjust Gamma based on the brightness of different sub-pixels to obtain the brightness curves of different sub-emissive layers of sub-pixels R and G, namely sub-emissive layer G1, sub-emissive layer G2, and sub-pixel B at different gray levels. Calculate the gray level change curve of sub-pixel G with brightness using the brightness curves of sub-pixels R and B, and use the gray level change curves of sub-emissive layers G1 and G2 as the lookup database.

[0072] Step S004: Map the input source signal LG = LG1 + LG2. When signal G is input, find the target brightness corresponding to it in the grayscale brightness curve of G. Based on the target brightness and the brightness ratio rules of sub-emitting layer G1 and sub-emitting layer G2, find the mapping grayscale corresponding to sub-emitting layer G1 and sub-emitting layer G2, and complete the mapping.

[0073] Based on the display panel with sub-pixels having different structures provided in this embodiment, all can refer to the above-described... Figure 2 The process of determining the grayscale brightness mapping relationship of the display panel shown is used to determine its own grayscale brightness mapping relationship.

[0074] Specifically, such as Figure 8 As shown, when the light-emitting layers corresponding to sub-pixels R, G, and B in the display panel are all double-layer structures, and only the two light-emitting layers of sub-pixel G, namely sub-light-emitting layer G1 and sub-light-emitting layer G2, emit green light with two different peak wavelengths respectively, when performing the grayscale brightness mapping relationship of the display panel, it is only necessary to refer to the above process and modify the source signal in step S004, "mapping the input source signal LG = LG1 + LG2", to 2LG = LG1 + LG2, while the other steps remain unchanged.

[0075] It should be understood that the above example only provides a method for mapping the grayscale brightness of a display panel, and the display panel includes a sub-pixel that emits excitation light with two peak wavelengths. When the display panel includes a sub-pixel that emits excitation light with multiple peak wavelengths, or when it includes multiple sub-pixels that emit excitation light with multiple peak wavelengths, the process for determining the grayscale brightness mapping relationship can refer to the method in the above example, providing corresponding input source signals for mapping, and will not be elaborated upon here.

[0076] A second aspect of this application provides a display device, which includes a display panel according to any of the above embodiments.

[0077] In at least one embodiment, the display device further includes a touch sensor, a touch chip, and a flexible circuit board for implementing touch control. To achieve a thinner and lighter touch display device, the touch sensor is disposed within the encapsulation layer of the display device, the touch chip is disposed on the flexible circuit board, and signals are transmitted to the touch sensor via touch signal lines.

[0078] In at least one embodiment, the display device can be any product or component with display and touch functions, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Implementation of this display device can refer to the embodiments of the array substrate described above; details will not be repeated.

[0079] 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 pixel units, and each pixel unit includes multiple sub-pixels with different preset light-emitting colors. In the pixel unit, the excitation light of at least one of the sub-pixels includes at least two peak wavelengths, and the light-emitting layer of all the sub-pixels includes at least two sub-light-emitting layers. In the sub-pixels provided with excitation light including at least two peak wavelengths, the peak wavelengths of the excitation light of different sub-light-emitting layers are different. The excitation light of a portion of the sub-pixels included in the pixel unit includes at least two peak wavelengths, while the excitation light of another portion of the sub-pixels includes one peak wavelength. The pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the peak wavelength of the excitation light of the first sub-pixel is greater than the peak wavelength of the excitation light of the second sub-pixel, the peak wavelength of the excitation light of the second sub-pixel is greater than the peak wavelength of the excitation light of the third sub-pixel, and the excitation light of the second sub-pixel includes at least two peak wavelengths. The excitation light of the first sub-pixel is red, the excitation light of the second sub-pixel is green, and the excitation light of the third sub-pixel is blue; The grayscale brightness mapping relationship of the display panel is configured such that the source signal input to the second sub-pixel is mapped to the grayscale corresponding to each sub-emitting layer according to the brightness ratio rule of each sub-emitting layer of the second sub-pixel.

2. The display panel according to claim 1, characterized in that, In a sub-pixel having at least two sub-emitting layers, the thickness of each sub-emitting layer is not equal, but the brightness is equal under the same driving voltage.

3. The display panel according to claim 1, characterized in that, In the sub-pixel having at least two sub-emitting layers, each sub-emitting layer has the same thickness and different brightness under the same driving voltage.

4. The display panel according to any one of claims 1-3, characterized in that, The excitation light of all the sub-pixels included in the pixel unit includes at least two peak wavelengths.

5. The display panel according to claim 1, characterized in that, In the sub-pixel whose excitation light includes a peak wavelength, the light-emitting layer of the sub-pixel includes at least two sub-light-emitting layers, and the peak wavelength of the excitation light of at least two of the sub-light-emitting layers is the same.

6. A display device, characterized in that, Includes the display panel as described in any one of claims 1-5.

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