Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device. When the display panel is configured to display white light, under different visual angles, the absolute value of the average value of the difference values of the chromaticity variation of the first light-emitting unit and the chromaticity variation of the second light-emitting unit is smaller than or equal to a first preset value. The absolute value of the average value of the difference between the chromaticity variation of the first light-emitting unit and the chromaticity variation of the third light-emitting unit is smaller than or equal to a first preset value, and the absolute value of the average value of the difference between the chromaticity variation of the second light-emitting unit and the chromaticity variation of the third light-emitting unit is smaller than or equal to the first preset value. Therefore, the difference value of the chromaticity variation of the light-emitting units of each color is relatively small, that is, the chromaticity variation of the light-emitting units of different colors at the same angle is similar or even the same, so that the color cast can be eliminated.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) display devices are widely used in various fields because of their lightness, wide viewing angle, low power consumption, fast response speed, low temperature resistance, high luminous efficiency, and the ability to prepare curved flexible display screens. OLED display devices include a pixel definition layer, a hole layer, a light-emitting layer, and an electron layer. By setting light-emitting layers of different light-emitting colors in different pixel openings, pure color display or color display of different colors can be achieved. However, during the display process of OLED display devices, it was found that as the viewing angle increases, the color deviation of OLED display devices is more serious, resulting in poor display.

[0003] Therefore, existing OLED display devices have a technical problem of severe color deviation at a wide viewing angle. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a display device to solve the technical problem that existing OLED display devices have serious color deviation under a wide viewing angle.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a display panel is provided, the display panel comprising a first light-emitting unit, a second light-emitting unit and a third light-emitting unit emitting light of different colors;

[0006] Wherein, when the display panel is configured to display white light, at different viewing angles, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit and the chromaticity change of the second light-emitting unit is less than or equal to a first preset value, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit and the chromaticity change of the third light-emitting unit is less than or equal to the first preset value, and the absolute value of the average value of the difference between the chromaticity change of the second light-emitting unit and the chromaticity change of the third light-emitting unit is less than or equal to the first preset value.

[0007] According to a second aspect of the present application, a display device is provided, comprising a display panel as described in any one of the above embodiments.

[0008] The embodiments of the present application provide a display panel and a display device; when the display panel is configured to display white light, at different viewing angles, the absolute value of the average value of the difference between the chromaticity change amount of a first light-emitting unit and the chromaticity change amount of a second light-emitting unit is less than or equal to a first preset value, the absolute value of the average value of the difference between the chromaticity change amount of the first light-emitting unit and the chromaticity change amount of the third light-emitting unit is less than or equal to the first preset value, and the absolute value of the average value of the difference between the chromaticity change amount of the second light-emitting unit and the chromaticity change amount of the third light-emitting unit is less than or equal to the first preset value, so that the difference in the chromaticity change amount of light-emitting units of each color is relatively small, that is, the chromaticity change amounts of light-emitting units of different colors at the same angle are similar or even the same, thereby eliminating color deviation.

[0009] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0011] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0012] Figure 1 A schematic diagram of a display panel provided in an embodiment of the present application.

[0013] Figure 2 This is a graph showing the chromaticity change of light of different colors at different viewing angles of a display panel provided in an embodiment of the present application.

[0014] Figure 3 A graph showing the chromaticity change of white light and tristimulus values ​​at different viewing angles of a display panel provided in an embodiment of the present application.

[0015] Figure 4 This is a graph showing the chromaticity change of light of different colors at different viewing angles of another display panel provided in an embodiment of the present application.

[0016] Figure 5 This is a graph of the chromaticity change and tristimulus values ​​of white light at different viewing angles of another display panel provided in an embodiment of the present application.

[0017] Figure 6This is a graph showing the chromaticity change of light of different colors at different viewing angles of a comparative display device provided in an embodiment of the present application.

[0018] Figure 7 The graphs are of the chromaticity change and tristimulus values ​​of white light at different viewing angles of the comparative display device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0020] In view of the technical problem that existing OLED display devices have serious color deviation at a wide viewing angle, the embodiments of the present application provide a display panel and a display device to solve the above technical problem.

[0021] Figure 1 A schematic diagram of a display panel provided in an embodiment of the present application. Figure 2 This is a graph showing the chromaticity change of light of different colors at different viewing angles of a display panel provided in an embodiment of the present application. Figure 3 A graph showing the chromaticity change of white light and tristimulus values ​​at different viewing angles of a display panel provided in an embodiment of the present application. Figure 4 This is a graph showing the chromaticity change of light of different colors at different viewing angles of another display panel provided in an embodiment of the present application. Figure 5 This is a graph of the chromaticity change and tristimulus values ​​of white light at different viewing angles of another display panel provided in an embodiment of the present application.

[0022] like Figures 1 to 5 As shown, an embodiment of the present application provides a display panel, which includes a first light-emitting unit 101, a second light-emitting unit 102 and a third light-emitting unit 103 with different light-emitting colors, wherein, when the display panel 1 is configured to display white light, at different viewing angles, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit 101 and the chromaticity change of the second light-emitting unit 102 is less than or equal to a first preset value, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit 101 and the chromaticity change of the third light-emitting unit 103 is less than or equal to the first preset value, and the absolute value of the average value of the difference between the chromaticity change of the second light-emitting unit 102 and the chromaticity change of the third light-emitting unit 103 is less than or equal to the first preset value.

[0023] An embodiment of the present application provides a display panel. When the display panel is configured to display white light, at different viewing angles, the absolute value of the average value of the difference between the chromaticity change amount of a first light-emitting unit and the chromaticity change amount of a second light-emitting unit is less than or equal to a first preset value, the absolute value of the average value of the difference between the chromaticity change amount of the first light-emitting unit and the chromaticity change amount of a third light-emitting unit is less than or equal to the first preset value, and the absolute value of the average value of the difference between the chromaticity change amount of the second light-emitting unit and the chromaticity change amount of the third light-emitting unit is less than or equal to the first preset value, so that the difference in the chromaticity change amount of light-emitting units of each color is relatively small, that is, the chromaticity change amounts of light-emitting units of different colors at the same angle are similar or even the same, thereby eliminating color deviation.

[0024] Specifically, when the display panel has a total of 256 gray levels from 0 to 255, the embodiment of the present application provides Figures 2 to 7 The data are measured when the display panel has a color filter layer and each light-emitting unit of the display panel displays 255 gray levels.

[0025] Specifically, in the drawings in the embodiments of the present application, the viewing angle when viewing the display panel directly is set to zero degrees, the viewing angle when viewing the display panel from the left is set to a negative viewing angle, and the viewing angle when viewing the display panel from the right is set to a positive viewing angle.

[0026] Specifically, since the image of the display panel cannot be seen at too large a viewing angle, for example, at 90 degrees, you are already on the side of the display panel and cannot see the front of the display panel. Therefore, the maximum viewing angle in the embodiment of the present application is 70 degrees (including a left viewing angle of 70 degrees and a right viewing angle of 70 degrees, that is, it can be plus or minus 70 degrees), and all data in the embodiment of the present application are based on the data at a viewing angle of 70 degrees, and the relationship between the various parameters in the embodiment of the present application is also based on the data at a viewing angle of 70 degrees.

[0027] Specifically, Figure 2 , Figure 4 As shown, the horizontal axis is the viewing angle, the unit is degree, the vertical axis is the chromaticity change Δuv, curve 1 is the curve of the chromaticity change of red light, curve 2 is the curve of the chromaticity change of green light, curve 3 is the curve of the chromaticity change of blue light, and curve 4 is the curve of the chromaticity change of white light.

[0028] Specifically, the first preset value ranges from 0 to 0.01, which may be 0 to 0.001, 0.001 to 0.002, 0.002 to 0.003, 0.003 to 0.004, 0.004 to 0.005, 0.005 to 0.006, 0.006 to 0.007, 0.007 to 0.008, 0.008 to 0.009, 0.009 To 0.01, specifically 0.01, 0.0095, 0.009, 0.0085, 0.008, 0.0075, 0.007, 0.0065, 0.006, 0.0055, 0.005, 0.0045, 0.004, 0.003, 0.0035, 0.002, 0.0025, 0.001, 0.0005.

[0029] Specifically, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

[0030] Specifically, it can be understood that when the display panel is displaying, the color coordinates of each light-emitting unit can be determined, the tristimulus value XYZ can be determined based on the color coordinate system CIE1931, the color coordinates (x, y, z) can be determined based on the tristimulus value XYZ, the color coordinates (u, v) can be determined based on the color coordinate system CIE1976, the color coordinates in the color coordinate system 1931 can be converted to the color coordinates in the color coordinate system 1976, and then the chromaticity change can be determined based on the color coordinates.

[0031] Chromaticity change Δuv = [(u1-u0) 2 +(v1-v0) 2 ] 0.5 ,

[0032] Among them, (u1, v1) refers to the color coordinates at a certain viewing angle, and (u0, v0) refers to the color coordinates at a viewing angle of zero degrees. For example, the viewing angle is zero degrees when the display panel is viewed from the front, the viewing angle is set to a negative viewing angle when the display panel is viewed from the left, and the viewing angle is set to a positive viewing angle when the display panel is viewed from the right. For example, when the display panel is viewed from the left at 30 degrees, the viewing angle can be recorded as -30 degrees, then there will be a color coordinate at -30 degrees, and there will be a color coordinate at 0 degrees, and the chromaticity change can be determined based on these two color coordinates. Specifically, when determining the chromaticity change, the chromaticity change of red light, the chromaticity change of green light, the chromaticity change of blue light, and the chromaticity change of white light can be determined respectively, and the color coordinates of white light can be determined based on the red light brightness, the green light brightness, the blue light brightness, and the red light color coordinates, green light color coordinates, and blue light color coordinates based on the color coordinate system CIE1931.

[0033] Specifically, the hole injection layer, the hole transport layer and the light-emitting layer can be formed by inkjet printing. It is understandable that when the hole injection layer, the hole transport layer and the light-emitting layer are formed by inkjet printing, the thickness of each region of a film layer is difficult to control to be equal due to the accuracy of inkjet printing, which will lead to certain differences in the thickness of each region of a film layer. For example, the first light-emitting layer will be arranged in multiple openings of the pixel definition layer as the light-emitting material of multiple first light-emitting units, but during inkjet printing, the thickness of the first light-emitting layer in different openings will be different, so that its thickness is a range rather than a value.

[0034] Specifically, in order to illustrate the principle of color deviation in the embodiment of the present application and the principle of solving color deviation in the embodiment of the present application, a comparison display device is provided, and a curve diagram of the chromaticity change of light of different colors at different viewing angles of the comparison display device is provided. The chromaticity change of white light and curve diagrams of three stimulus values ​​at different viewing angles of the comparison display device are provided. The structure in the comparison display device can be the same as the structure of the display panel in the present application, except that the sum of the thickness of the hole injection layer, hole transport layer and light-emitting layer of each light-emitting unit in the comparison display device is different from the sum of the thickness of the hole injection layer, hole transport layer and light-emitting layer of the corresponding light-emitting unit in the display panel provided in the embodiment of the present application.

[0035] The sum of the thickness of the hole injection layer, hole transport layer and light-emitting layer in the red light-emitting unit of the comparison display device is in the range of 280 nanometers to 290 nanometers, the sum of the thickness of the hole injection layer, hole transport layer and light-emitting layer in the green light-emitting unit is in the range of 230 nanometers to 240 nanometers, and the sum of the thickness of the hole injection layer, hole transport layer and light-emitting layer in the blue light-emitting unit is in the range of 180 nanometers to 190 nanometers. Figure 6 , Figure 7 The data shown, Figure 6 The horizontal axis is the viewing angle, in degrees, the vertical axis is the chromaticity change Δuv, curve 1 is the curve of the chromaticity change of red light, curve 2 is the curve of the chromaticity change of green light, curve 3 is the curve of the chromaticity change of blue light, and curve 4 is the curve of the chromaticity change of white light; Figure 7 The horizontal axis is the viewing angle in degrees, the vertical axis is the three stimulus values ​​of white light, and the other vertical axis is the chromaticity change Δuv of white light. Curve 1 is the change curve of X in the three stimulus values ​​of white light, curve 2 is the change curve of Y in the three stimulus values ​​of white light, curve 3 is the change curve of Z in the three stimulus values ​​of white light, and curve 4 is the curve of chromaticity change of white light.

[0036] from Figure 6 and Figure 7As can be seen from the figure, the chromaticity change of red light is relatively small as the angle increases, while the chromaticity change of green and blue light is relatively large as the angle increases. Figure 6 It can be seen that when the viewing angle has not reached 30 degrees, the chromaticity change of green light and blue light has exceeded 0.02, while the chromaticity change of red light only reaches 0.02 when the viewing angle is about 50 degrees, which makes the absolute value of the difference in the chromaticity change of each color large, resulting in a relatively large change in the chromaticity change of white light as the angle increases, resulting in serious color deviation. Figure 7 It can also be seen that the three stimulus values ​​XYZ of white light change at different amplitudes as the angle changes. The chromaticity change of white light reaches 0.02 when the viewing angle is less than 30 degrees, making the color deviation more serious.

[0037] The embodiments of the present application found that by increasing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the first light-emitting unit, the amplitude of the change in the chromaticity of the red light can be increased, that is, by increasing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the first light-emitting unit, the amplitude of the change in the chromaticity of the red light can be larger at the same viewing angle; by reducing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the second light-emitting unit, the amplitude of the change in the chromaticity of the green light can be reduced, that is, by reducing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the second light-emitting unit, the amplitude of the change in the chromaticity of the green light can be smaller at the same viewing angle; by reducing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the third light-emitting unit, the amplitude of the change in the chromaticity of the blue light can be reduced, that is, by reducing the sum of the thicknesses of the hole injection layer, hole transport layer and light-emitting layer of the third light-emitting unit, the amplitude of the change in the chromaticity of the blue light can be smaller at the same viewing angle. Therefore, the embodiment of the present application reduces the color deviation by adjusting the sum of the thicknesses of the hole injection layer, the hole transport layer and the light-emitting layer of each light-emitting unit.

[0038] In some embodiments, when the display panel 1 is configured to display white light, at the same viewing angle, the absolute value of the difference between the change amount of the first stimulus value of the white light and the change amount of the second stimulus value of the white light is less than or equal to the second preset value, the absolute value of the difference between the change amount of the first stimulus value of the white light and the change amount of the third stimulus value of the white light is less than or equal to the second preset value, and the absolute value of the difference between the change amount of the second stimulus value of the white light and the change amount of the third stimulus value of the white light is less than or equal to the second preset value. When the display panel is configured to display white light, at the same viewing angle, the absolute value of the difference between the change amount of the first stimulus value of the white light and the change amount of the second stimulus value of the white light is less than or equal to the second preset value, the absolute value of the difference between the change amount of the first stimulus value of the white light and the change amount of the third stimulus value of the white light is less than or equal to the second preset value, and the absolute value of the difference between the change amount of the second stimulus value of the white light and the change amount of the third stimulus value of the white light is less than or equal to the second preset value, so that the difference of the three stimulus values ​​of the white light is relatively small, thereby eliminating color shift.

[0039] Specifically, the second preset value can be 0 to 0.1, specifically 0 to 0.001, 0.001 to 0.002, 0.002 to 0.003, 0.003 to 0.004, 0.004 to 0.005, 0.005 to 0.006, 0.006 to 0.007, 0.007 to 0.008, 0.008 to 0.009, 0 to 0.01, 0.01 to 0.02, 0.02 to 0.03, 0.03 to 0.04, 0.04 to 0.05, 0.05 to 0.06, 0.006 to 0.07, 0.07 to 0.08, 0.08 to 0.09, 0.09 to 0. .1, specifically 0.1, 0.095, 0.09, 0.085, 0.08, 0.075, 0.07, 0.065, 0.06, 0.055, 0.05, 0.045, 0.04, 0.03, 0.035, 0.02, 0.025, 0.01, 0.0095, 0.009, 0.0085, 0.008, 0.0075, 0.007, 0.0065, 0.006, 0.0055, 0.005, 0.0045, 0.004, 0.003, 0.0035, 0.002, 0.0025, 0.001, and 0.0005.

[0040] like Figure 3 , Figure 5 As shown, Figure 3The horizontal axis is the viewing angle in degrees, one vertical axis is the three stimulus values ​​of white light, and the other vertical axis is the chromaticity change of white light Δuv. Curve 1 is the change curve of X in the three stimulus values ​​of white light, curve 2 is the change curve of Y in the three stimulus values ​​of white light, curve 3 is the change curve of Z in the three stimulus values ​​of white light, and curve 4 is the curve of the chromaticity change of white light. Figure 3 , Figure 5 As shown, it can be seen that as the viewing angle changes, the change amplitudes of the three stimulus values ​​of white light are basically the same, and the curves of the three stimulus values ​​basically overlap, which makes the color deviation less severe and improves the color deviation.

[0041] Specifically, Figure 3 , Figure 5 , Figure 7 As shown, the three stimulus values ​​of white light at different viewing angles are obtained based on the fact that the three stimulus values ​​of white light at a viewing angle of zero degree are all 1.

[0042] Specifically, Figure 2 , Figure 4 , Figure 6 As shown, the chromaticity change amount of each color of light is determined based on the fact that the chromaticity change amount of each color of light at a viewing angle of zero degree is 0.

[0043] Specifically, Figures 2 to 7 It can be seen that the difference in the amplitude of the chromaticity change of any two of the red light, green light, and white light in the embodiment of the present application is smaller than the difference in the amplitude of the chromaticity change of the corresponding two of the red light, green light, and white light in the comparative display device, and the difference in the amplitude of the change of the three stimulus values ​​of the white light in the embodiment of the present application with the change of the viewing angle is smaller, and the curve of the chromaticity change of the white light in the embodiment of the present application changes less with the increase of the viewing angle, thereby improving the color deviation.

[0044] In some embodiments, Figure 1 As shown, the display panel 1 includes a substrate 11 , a driving circuit layer 12 , a pixel electrode layer 131 , a pixel definition layer 132 , a light emitting material layer 130 , a common electrode layer 137 and an encapsulation layer 14 .

[0045] Specifically, the display panel may further include a color filter layer, and the color filter layer includes a red color resist, a green color resist, and a blue color resist.

[0046] Specifically, the driving circuit layer 12 includes an active layer 121, a gate insulating layer 122, a gate layer 123, an interlayer insulating layer 124, a source and drain layer 125 and a planarization layer 126, but the embodiments of the present application are not limited thereto. The driving circuit layer can be other structures, for example, including two gate layers, three gate layers, and / or active layers of two different materials, and / or two source and drain layers, three source and drain layers.

[0047] Specifically, the pixel electrode layer 131 may include a plurality of insulated pixel electrodes.

[0048] Specifically, the embodiment of the present application takes the example that the pixel definition layer includes only one layer, but the embodiment of the present application is not limited to this. The pixel definition layer may include two layers, three layers or more layers, and the setting method of multiple pixel definition layers is not limited.

[0049] Specifically, the light emitting material layer 130 includes a hole injection layer 133 , a hole transport layer 134 , a light emitting layer 135 and an electron layer 136 .

[0050] Specifically, the electron layer may include an electron transport layer and an electron injection layer sequentially arranged away from the substrate, and the thickness of the electron layer may be 30 nanometers.

[0051] Specifically, the hole injection layer 133 may include a first hole injection layer 133a, a second hole injection layer 133b and a third hole injection layer 133c, the hole transport layer 134 includes a first hole transport layer 134a, a second hole transport layer 134b and a third hole transport layer 134c, and the light-emitting layer 135 includes a first light-emitting layer 135a, a second light-emitting layer 135b and a third light-emitting layer 135c corresponding to the first light-emitting unit 101, the second light-emitting unit 102 and the third light-emitting unit 103 respectively; the first hole injection layer 133a, the first hole transport layer 134a and the first light-emitting layer 135a are stacked, the second hole injection layer 133b, the second hole transport layer 134b and the second light-emitting layer 135b are stacked, and the third hole injection layer 133c, the third hole transport layer 134c and the third light-emitting layer 135c are stacked.

[0052] In some embodiments, Figure 1 As shown, the display panel 1 includes a substrate 11; a light-emitting material layer 130, which is arranged on one side of the substrate 11, and the light-emitting material layer 130 includes a hole injection layer 133, a hole transport layer 134 and a light-emitting layer 135 which are stacked in sequence, the hole injection layer 133 includes a first hole injection layer 133a, a second hole injection layer 133b and a third hole injection layer 133c, the hole transport layer 134 includes a first hole transport layer 134a, a second hole transport layer 134b and a third hole transport layer 134c, and the light-emitting layer 135 includes a first light-emitting layer 135a, a second light-emitting layer 135b and a third light-emitting layer 135c corresponding to the first light-emitting unit 101, the second light-emitting unit 102 and the third light-emitting unit 103 respectively;

[0053] Among them, the sum of the thicknesses of the first hole injection layer 133a, the first hole transport layer 134a and the first light-emitting layer 135a (i.e., L1+L2+L3) ranges from 285 nanometers to 310 nanometers; the sum of the thicknesses of the second hole injection layer 133b, the second hole transport layer 134b and the second light-emitting layer 135b (i.e., L4+L5+L6) ranges from 215 nanometers to 237 nanometers; the sum of the thicknesses of the third hole injection layer 133c, the third hole transport layer 134c and the third light-emitting layer 135c (i.e., L7+L8+L9) ranges from 167 nanometers to 188 nanometers. The color deviation can be improved by making the sum of the thickness of the first hole injection layer, the first hole transport layer and the first light-emitting layer range from 285 nanometers to 310 nanometers; the sum of the thickness of the second hole injection layer, the second hole transport layer and the second light-emitting layer range from 215 nanometers to 237 nanometers; the sum of the thickness of the third hole injection layer, the third hole transport layer and the third light-emitting layer range from 167 nanometers to 188 nanometers.

[0054] In some embodiments, the sum of the thicknesses of the first hole injection layer 133a, the first hole transport layer 134a and the first light-emitting layer 135a (i.e., L1+L2+L3) is in a range of 285 nanometers to 295 nanometers, the sum of the thicknesses of the second hole injection layer 133b, the second hole transport layer 134b and the second light-emitting layer 135b (i.e., L4+L5+L6) is in a range of 225 nanometers to 235 nanometers, and the sum of the thicknesses of the third hole injection layer 133c, the third hole transport layer 134c and the third light-emitting layer 135c (i.e., L7+L8+L9) is in a range of 177 nanometers to 187 nanometers. The color deviation can be improved by making the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer range from 285 nanometers to 295 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer range from 225 nanometers to 235 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer range from 177 nanometers to 187 nanometers.

[0055] In some embodiments, the sum of the thicknesses of the first hole injection layer 133a, the first hole transport layer 134a and the first light-emitting layer 135a (i.e., L1+L2+L3) ranges from 290 nanometers to 300 nanometers, the sum of the thicknesses of the second hole injection layer 133b, the second hole transport layer 134b and the second light-emitting layer 135b (i.e., L4+L5+L6) ranges from 227 nanometers to 237 nanometers, and the sum of the thicknesses of the third hole injection layer 133c, the third hole transport layer 134c and the third light-emitting layer 135c (i.e., L7+L8+L9) ranges from 178 nanometers to 188 nanometers. By making the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer range from 290 nanometers to 300 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer range from 227 nanometers to 237 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer range from 178 nanometers to 188 nanometers, the color deviation can be improved.

[0056] Specifically, when other film structures and film parameters are the same, Figure 2 and Figure 3 The data is measured when the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer is in the range of 285 nanometers to 295 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer is in the range of 225 nanometers to 235 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer is in the range of 177 nanometers to 187 nanometers; Figure 4 and Figure 5 The data is measured when the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer is in the range of 290 nanometers to 300 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer is in the range of 227 nanometers to 237 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer is in the range of 178 nanometers to 188 nanometers; Figures 2 to 7 It can be seen that the color shift in the embodiment of the present application is reduced relative to the comparative display device.

[0057] Specifically, it can be understood that the range of the sum of the thickness of the hole injection layer, the hole transport layer and the light-emitting layer of each light-emitting unit in the embodiment of the present application overlaps with the range of the sum of the thickness of the hole injection layer, the hole transport layer and the light-emitting layer of each light-emitting unit of the comparative display device. This is because the thickness cannot be exactly the same when inkjet printing is used. However, it can be seen that the middle value of the sum of the thickness of the first hole injection layer, the first hole transport layer and the first light-emitting layer in the embodiment of the present application must be greater than the middle value of the sum of the thickness of the hole injection layer, the hole transport layer and the light-emitting layer of the red light-emitting unit of the comparative display device, and the second hole injection layer The middle value of the sum of the thicknesses of the first hole injection layer, the second hole transport layer and the second light-emitting layer must be smaller than the middle value of the sum of the thicknesses of the hole injection layer, the hole transport layer and the light-emitting layer of the green light-emitting unit of the comparative display device; the middle value of the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer must be smaller than the middle value of the sum of the thicknesses of the hole injection layer, the hole transport layer and the light-emitting layer of the blue light-emitting unit of the comparative display device, thereby increasing the thicknesses of the hole injection layer, the hole transport layer and the light-emitting layer in the first light-emitting unit, reducing the thicknesses of the hole injection layer, the hole transport layer and the light-emitting layer in the second light-emitting unit and the third light-emitting unit, and improving color deviation.

[0058] Specifically, the median value of the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer in different regions is greater than 285 nanometers, the median value of the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer in different regions is less than 235 nanometers, and the median value of the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer in different regions is less than 185 nanometers.

[0059] Specifically, the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer is greater than 290 nanometers and less than or equal to 310 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer is greater than or equal to 215 nanometers and less than 230 nanometers; the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer is greater than or equal to 167 nanometers and less than 180 nanometers.

[0060] In some embodiments, the thickness range L1 of the first hole injection layer 133a is 40 nm to 60 nm, the thickness range L2 of the first hole transport layer 134a is 150 nm to 200 nm, and the thickness range L3 of the first light emitting layer 135a is 45 nm to 80 nm.

[0061] In some embodiments, the thickness range L4 of the second hole injection layer 133b is 30 to 50 nanometers, the thickness range L5 of the second hole transport layer 134b is 120 to 170 nanometers, and the thickness range L6 of the second light emitting layer 135b is 35 to 60 nanometers.

[0062] In some embodiments, the thickness range L7 of the third hole injection layer 133c is 20 to 40 nanometers, the thickness range L8 of the third hole transport layer 134c is 90 to 140 nanometers, and the thickness range L9 of the third light emitting layer 135c is 25 to 50 nanometers.

[0063] Specifically, it can be understood that the first light-emitting unit includes a pixel electrode, a first hole injection layer, a first hole transport layer, a first light-emitting layer, an electron layer and a common electrode layer; the second light-emitting unit includes a pixel electrode, a second hole injection layer, a second hole transport layer, a second light-emitting layer, an electron layer and a common electrode layer; the third light-emitting unit includes a pixel electrode, a third hole injection layer, a third hole transport layer, a third light-emitting layer, an electron layer and a common electrode layer.

[0064] Specifically, the electronic layer can be formed by evaporation.

[0065] In some embodiments, when the display panel 1 is configured to display white light, when the viewing angle is less than 70 degrees, the chromaticity change of the white light is less than 0.013, thereby improving color deviation.

[0066] Specifically, Figures 2 to 7 As shown, compared with the comparative display device, the chromaticity change of white light exceeds 0.015 when the viewing angle is 30 degrees or -30 degrees, and the color deviation is more serious. The display panel in the embodiment of the present application has a chromaticity change of white light of less than 0.013 when the viewing angle is 70 degrees, thereby improving the color deviation.

[0067] Specifically, when the display panel 1 is configured to display white light, when the viewing angle is less than or equal to 30 degrees, the chromaticity change of the white light is less than 0.02.

[0068] Specifically, when the display panel 1 is configured to display white light, when the viewing angle is less than or equal to 30 degrees, the chromaticity change of the blue light is less than 0.02, and the chromaticity change of the green light is less than 0.02.

[0069] At the same time, an embodiment of the present application provides a display device, which includes a display panel as described in any of the above embodiments.

[0070] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0073] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display panel, characterized in that: comprising a first light emitting unit, a second light emitting unit and a third light emitting unit having different light emitting colors; Wherein, when the display panel is configured to display white light, at different viewing angles, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit and the chromaticity change of the second light-emitting unit is less than or equal to a first preset value, the absolute value of the average value of the difference between the chromaticity change of the first light-emitting unit and the chromaticity change of the third light-emitting unit is less than or equal to the first preset value, and the absolute value of the average value of the difference between the chromaticity change of the second light-emitting unit and the chromaticity change of the third light-emitting unit is less than or equal to the first preset value.

2. The display panel according to claim 1, characterized in that: When the display panel is configured to display white light, at the same viewing angle, the absolute value of the difference between the change in the first stimulus value of the white light and the change in the second stimulus value of the white light is less than or equal to the second preset value, the absolute value of the difference between the change in the first stimulus value of the white light and the change in the third stimulus value of the white light is less than or equal to the second preset value, and the absolute value of the difference between the change in the second stimulus value of the white light and the change in the third stimulus value of the white light is less than or equal to the second preset value.

3. The display panel according to claim 2, characterized in that: The display panel comprises: substrate; A light-emitting material layer, arranged on one side of the substrate, the light-emitting material layer comprises a hole injection layer, a hole transport layer and a light-emitting layer which are stacked in sequence, the hole injection layer comprises a first hole injection layer, a second hole injection layer and a third hole injection layer, the hole transport layer comprises a first hole transport layer, a second hole transport layer and a third hole transport layer, and the light-emitting layer comprises a first light-emitting layer, a second light-emitting layer and a third light-emitting layer which correspond to the first light-emitting unit, the second light-emitting unit and the third light-emitting unit respectively; Among them, the sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer ranges from 285 nanometers to 310 nanometers; the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer ranges from 215 nanometers to 237 nanometers; the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer ranges from 167 nanometers to 188 nanometers.

4. The display panel according to claim 3, characterized in that: The sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer ranges from 285 nanometers to 295 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer ranges from 225 nanometers to 235 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer ranges from 177 nanometers to 187 nanometers.

5. The display panel according to claim 3, characterized in that: The sum of the thicknesses of the first hole injection layer, the first hole transport layer and the first light-emitting layer ranges from 290 nanometers to 300 nanometers, the sum of the thicknesses of the second hole injection layer, the second hole transport layer and the second light-emitting layer ranges from 227 nanometers to 237 nanometers, and the sum of the thicknesses of the third hole injection layer, the third hole transport layer and the third light-emitting layer ranges from 178 nanometers to 188 nanometers.

6. The display panel according to claim 3, characterized in that: The thickness of the first hole injection layer ranges from 40 nanometers to 60 nanometers, the thickness of the first hole transport layer ranges from 150 nanometers to 200 nanometers, and the thickness of the first light-emitting layer ranges from 45 nanometers to 80 nanometers.

7. The display panel according to claim 3, characterized in that: The thickness of the second hole injection layer ranges from 30 to 50 nanometers, the thickness of the second hole transport layer ranges from 120 to 170 nanometers, and the thickness of the second light emitting layer ranges from 35 to 60 nanometers.

8. The display panel according to claim 3, characterized in that: The thickness of the third hole injection layer is in the range of 20 to 40 nanometers, the thickness of the third hole transport layer is in the range of 90 to 140 nanometers, and the thickness of the third light emitting layer is in the range of 25 to 50 nanometers.

9. The display panel according to any one of claims 1 to 8, characterized in that: When the display panel is configured to display white light, when the viewing angle is less than 70 degrees, the chromaticity change of the white light is less than 0.

013.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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