Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device. The display panel comprises a non-bending area and at least one bending area located on at least one side of the non-bending area. The display panel comprises a substrate, a light-emitting layer and a color cast improving layer. The light-emitting layer is arranged on the substrate, the light-emitting layer comprises a plurality of light-emitting units, each light-emitting unit comprises at least a plurality of light-emitting subunits, and the light-emitting subunits can emit first color light, second color light and third color light; the color cast improving layer is arranged on the side, away from the substrate, of the light-emitting layer and located in at least one bending area; the difference of the light emitting proportions of the first color light, the second color light and the third color light in the front view direction is 0-8%; wherein the front view direction is perpendicular to at least one part of the surface of the non-bending area.

Description

Display panel, manufacturing method thereof, and display device Technical Field

[0001] The present invention belongs to the field of display technology, and in particular relates to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Flexible display panels (such as flexible OLED panels) are attracting increasing attention and application due to their bendability, portability, and wide range of applications. However, when the display area of ​​a flexible display panel is bent, it can cause color shift in the curved portion when viewed vertically. This color shift becomes more severe as the bending angle of the curved portion increases, impacting the viewer's viewing experience.

[0003] Summary of the Invention

[0004] According to a first aspect of an embodiment of the present invention, there is provided a display panel, comprising a non-bending region and at least one bending region located on at least one side of the non-bending region, the display panel comprising:

[0005] substrate;

[0006] a light-emitting layer disposed on the substrate, the light-emitting layer comprising a plurality of light-emitting units, each light-emitting unit comprising at least a plurality of light-emitting sub-units, the plurality of light-emitting sub-units being capable of emitting a first color light, a second color light, and a third color light;

[0007] a color deviation improvement layer, disposed on a side of the light-emitting layer facing away from the substrate and located in at least one of the bending regions;

[0008] The difference in light emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is 0-8%, wherein the normal viewing direction is perpendicular to at least a portion of the surface of the non-bending area.

[0009] In some embodiments, the difference in light emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is 0-5%.

[0010] In some embodiments, in the bending region, the initial light-emitting ratio of the first color light in the normal viewing direction is greater than the initial light-emitting ratio of the second color light in the normal viewing direction; the initial light-emitting ratio of the second color light in the normal viewing direction is greater than the initial light-emitting ratio of the third color light in the normal viewing direction;

[0011] The color deviation improvement layer is provided with a first color resist material for reducing the transmittance of the first color light.

[0012] In some embodiments, the color deviation improvement layer reduces the light-emission ratios of the first color light and the second color light in the normal viewing direction at the same time, so that the difference among the light-emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is reduced to a preset difference. The color deviation improvement layer is provided with a first color resist material for reducing the transmittance of the first color light, and a second color resist material for reducing the transmittance of the second color light.

[0013] In some embodiments, in the bending area, the transmittance of the first color in the normal viewing direction of the color deviation improvement layer is a first color deviation transmittance, and the transmittance of the second color light in the normal viewing direction of the color deviation improvement layer is a second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

[0014] In some embodiments, the color deviation improvement layer is fully transparent to the third color light; and / or,

[0015] Among the first color light, the second color light and the third color light, one is red light, one is green light and one is blue light.

[0016] In some embodiments, the bending area can be divided into one or more bending sub-areas, and the number of the bending sub-areas is divided according to the angle range of the positive viewing angle of the bending area of ​​the display panel; wherein, different bending sub-areas have different transmittances for at least one color of light, and the bending angle of each bending sub-area is a preset angle, and the preset angle is greater than or equal to 5° and less than or equal to 15°.

[0017] In some embodiments, the display panel includes an encapsulation layer disposed on the side of the light-emitting layer away from the substrate; wherein the color deviation improvement layer is disposed on the side of the encapsulation layer away from the light-emitting layer, or the color deviation improvement layer is disposed between the encapsulation layer and the light-emitting layer.

[0018] According to a second aspect of an embodiment of the present invention, a method for manufacturing a display panel is provided, for manufacturing the display panel as described above, the method comprising:

[0019] Determining a correspondence between a normal viewing angle and a normal viewing angle of the display panel for the first color light, the second color light, and the third color light;

[0020] Determining an angle range of a normal viewing angle of the display panel to determine a bending area of ​​the display panel;

[0021] Determining a color deviation improvement layer according to an angle range of a normal viewing angle of the bending region and a correspondence between a normal viewing angle ratio of the first color light, the second color light, and the third color light at the normal viewing angle of the display panel;

[0022] preparing the display panel according to the color deviation improvement layer;

[0023] The difference in light emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is 0-8%.

[0024] In some embodiments, in the bending region, the initial light-emitting ratio of the first color light in the normal viewing direction is greater than the initial light-emitting ratio of the second color light in the normal viewing direction; the initial light-emitting ratio of the second color light in the normal viewing direction is greater than the initial light-emitting ratio of the third color light in the normal viewing direction. The method for preparing the display panel according to the color deviation improvement layer includes:

[0025] A first color resist material for reducing the transmittance of the first color light is provided in the color deviation improvement layer, so as to reduce the light-emitting ratio of the first color light in the normal viewing direction.

[0026] In some embodiments, in the bending area, the initial light-emitting ratio of the first color light in the normal viewing direction is greater than the initial light-emitting ratio of the second color light in the normal viewing direction; the initial light-emitting ratio of the second color light in the normal viewing direction is greater than the initial light-emitting ratio of the third color light in the normal viewing direction.

[0027] The step of preparing the display panel using the color deviation improvement layer includes:

[0028] The color shift improvement layer includes a first color resist material for reducing the transmittance of the first color light and a second color resist material for reducing the transmittance of the second color light.

[0029] Among them, in the bending area, the transmittance of the first color in the normal viewing direction of the color deviation improvement layer is the first color deviation transmittance, and the transmittance of the second color light in the normal viewing direction of the color deviation improvement layer is the second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

[0030] In some embodiments, the method further comprises:

[0031] The bending area of ​​the display panel is divided into one or more bending sub-areas according to the bending angle of the bending area; wherein different bending sub-areas have different transmittances for at least one color of light; the bending angle of each bending sub-area is a preset angle, wherein the preset angle is greater than or equal to 5° and less than or equal to 15°.

[0032] According to a third aspect of the embodiments of the present invention, a display device is provided, comprising the display panel as described above.

[0033] The above-mentioned display panel and display device provided in the present application, by setting a color deviation improvement layer in at least one of the bending areas of the actual panel, make the difference in the light output ratio of the first color light, the second color light and the third color light in the normal viewing direction be 0-8%, which is beneficial to improving the color deviation phenomenon caused by the bending of the display panel, thereby improving the user's visual experience of viewing the display panel.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0036] FIG1 is a front view of a display device according to an embodiment of the present invention;

[0037] FIG2 is a cross-sectional view of a display panel in a flat state according to an embodiment of the present invention;

[0038] FIG3 is a partial cross-sectional view of a display panel in a flat state according to an embodiment of the present invention;

[0039] FIG4 is a schematic diagram of a display panel after being bent according to an embodiment of the present invention;

[0040] FIG5 is a schematic diagram showing area division of a display panel according to an embodiment of the present invention;

[0041] FIG6 is a schematic diagram showing a curve of the corresponding relationship between the normal viewing angle light output ratio and the normal viewing angle according to an embodiment of the present invention;

[0042] 7 is a comparison table showing the light emission ratios and bending angles of a display panel at some normal viewing angles according to an embodiment of the present invention;

[0043] FIG8 is a comparison table showing the light output ratio of a portion of the front viewing angle and the bending angle of an improved front display panel in the related art;

[0044] FIG9 is a comparison table showing the light emission ratios at partial normal viewing angles and the bending angles of a color deviation improvement layer according to an embodiment of the present invention;

[0045] FIG. 10 is a comparison table showing the light emission ratio of a portion of the normal viewing angle and the bending angle of an improved display panel according to an embodiment of the present invention.

[0046] FIG. 11 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0048] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this invention belongs. The use of "a" or "an," and similar terms in this specification and claims does not indicate a limitation of quantity, but rather indicates the presence of at least one. "Multiple" means two or more. "Include" or "comprising," and similar terms mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising," and their equivalents, and do not exclude other elements or objects. "Connected" or "connected," and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. "On" and / or "below," and similar terms are for convenience only and are not limited to a single position or spatial orientation. As used in this specification and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0049] The present application provides a display panel and a display device. The display panel includes a substrate, a light-emitting layer, and a color deviation improvement layer. The light-emitting layer is disposed on the substrate and includes a plurality of light-emitting units. Each light-emitting unit includes at least a plurality of light-emitting subunits. The plurality of light-emitting subunits are capable of emitting a first color light, a second color light, and a third color light. The color deviation improvement layer is disposed on a side of the light-emitting layer facing away from the substrate and located in at least one of the bending regions. In the display panel, the difference in the light-emitting ratios of the first color light, the second color light, and the third color light in the normal viewing direction is reduced to a preset difference value. The normal viewing direction is perpendicular to at least a portion of the surface of the non-bending region. In the above-mentioned display panel, by disposing the color deviation improvement layer in at least one of the bending regions of the actual panel, the difference in the light-emitting ratios of the first color light, the second color light, and the third color light in the normal viewing direction can be reduced to 0-8%, thereby improving the color deviation caused by the bending of the display panel and thereby improving the user's visual experience when viewing the display panel.

[0050] The display panel referred to in this application may be a flexible OLED panel. This display panel can be used in mobile phones, tablet computers, televisions, laptop computers, and other products or components with display functions, as a display panel for mobile phones, tablet computers, televisions, laptop computers, and other products or components with display functions.

[0051] The display panel and display device provided in this application are described in detail below with reference to Figures 2 to 10 .

[0052] The present application provides a display device 100. The display device 100 may include a display panel 2 or a similar display panel. The display device 100 also includes a device body 1 having a housing. The display panel 2 or a similar display panel may be assembled on the device body 1.

[0053] The display device mentioned here can be a mobile phone, tablet computer, television, laptop computer, or other product or device with a display function.

[0054] The display panel 2 mentioned here may be a flexible organic electro-luminescence display (OLED) panel.

[0055] The display panel 2 includes a non-bending region S1 and at least one bending region S2 located on at least one side of the non-bending region S1. The display panel 2 includes a substrate 10, a light-emitting layer 30, and a color deviation improvement layer 50. The light-emitting layer 30 is disposed on the substrate 10 and includes a plurality of light-emitting units. Each light-emitting unit includes at least a plurality of light-emitting sub-units. The plurality of light-emitting sub-units can emit a first color light, a second color light, and a third color light.

[0056] The color deviation improvement layer 50 is disposed on a side of the light emitting layer 30 facing away from the substrate 10 and is located in at least one of the bending regions S2 .

[0057] In the display panel 2 , the difference in the light emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is a preset difference; wherein the normal viewing direction is perpendicular to at least a portion of the surface of the non-bending area S1 .

[0058] In some embodiments, the preset difference is 0-8%.

[0059] Here, one of the first color light, the second color light, and the third color light is red light, one is green light, and one is blue light. Referring to FIG6 and FIG7 , the first color light is red light, the second color light is green light, and the third color light is blue light as an example for explanation.

[0060] It is understood that the light-emitting sub-units here may be sub-pixel units that emit monochromatic light, such as RGD sub-pixel units. Accordingly, in some embodiments, each light-emitting unit may include three light-emitting sub-units, which are respectively used to emit red light, green light, and blue light.

[0061] 3 , the light-emitting layer 30 may include light-emitting sub-pixels 31, a pixel-defining layer 32, and a planarization layer 33. The pixel-defining layer 32 defines a plurality of pixel openings. The light-emitting sub-pixels 31 may be disposed in the pixel openings defined by the pixel-defining layer 32.

[0062] In some embodiments, the display panel 2 includes an encapsulation layer 40 disposed on a side of the light emitting layer 30 facing away from the substrate 10 , and the color deviation improvement layer 50 is disposed on a side of the encapsulation layer 40 facing away from the light emitting layer 30 .

[0063] The non-bending area S1 here can be an area where the entire area is straight, or a part of the area is straight, or an area that is slightly curved as a whole. For example, as shown in Figure 5, the display panel is slightly curved as a whole, and the degree of curvature or the bending angle (hereinafter referred to as the positive viewing angle) of the non-bending area S1 can be determined according to the specific circumstances. Accordingly, a part of the continuous area where the positive viewing angle is less than or equal to the angle A0 can be considered as a non-bending area. The specific angle of the positive viewing angle A0 can be determined according to the specific circumstances. For example, in some embodiments, the positive viewing angle A0 is 3°. Accordingly, the area less than or equal to 3° can be considered as a non-bending area.

[0064] The normal viewing direction is perpendicular to the surface of the non-bending region. It is understood that for a non-bending region having a straight region, the normal viewing direction is perpendicular to the straight region. For a non-bending region without a straight region, the normal viewing direction can be understood as perpendicular to the external tangent line of a relatively straight surface of the non-bending region, such as the direction indicated by the 0° normal viewing angle shown in Figure 5.

[0065] The normal viewing angle at a specific location on a display panel can be understood as the angle between a line perpendicular to the tangent line of the display panel at that location and the normal viewing direction. It is understood that if a display panel has a straight area, the normal viewing angle of that straight area is 0°. For curved areas of a display panel, the normal viewing angle varies depending on the curvature angle. That is, the normal viewing angle at a specific location in a curved area is the angle between a line perpendicular to the tangent line of the display panel at that location and the normal viewing direction.

[0066] Preferably, in some embodiments, the preset difference is 0-5%.

[0067] The inventors have discovered that the smaller the preset difference, the better the color shift reduction effect. Preferably, the preset difference is 0 or close to 0, which ensures that the first, second, and third color lights have the same or substantially the same light output ratios in the normal viewing direction, thereby substantially unaffecting the overall viewing experience of the user due to the curvature of the display panel.

[0068] In some embodiments, in the bending region S2, the initial light-emission ratio of the first color light in the normal viewing direction is greater than the initial light-emission ratio of the second color light in the normal viewing direction; and the initial light-emission ratio of the second color light in the normal viewing direction is greater than the initial light-emission ratio of the third color light in the normal viewing direction. The color deviation improvement layer 50 can reduce the light-emission ratio of the first color light in the normal viewing direction or simultaneously reduce the light-emission ratios of the first color light and the second color light in the normal viewing direction, so that the difference between the light-emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is reduced to a predetermined difference.

[0069] The initial light output ratio mentioned here can be understood as the light output ratio of each color light in the same display panel without the color deviation improvement layer. In other words, the light output ratio of each color light when the display panel does not have the color deviation improvement layer and the other structures are the same as the display panel 2 of the present application is the same. It can also be referred to as the light output ratio before improvement.

[0070] Please refer to Figure 3. In some embodiments, the color deviation improvement layer 50 reduces the light output ratio of the first color light and the second color light in the normal viewing direction at the same time, so that the difference between the light output ratios of the first color light, the second color light and the third color light in the normal viewing direction is reduced to a preset difference. The color deviation improvement layer 50 is provided with a first color resist material 51 for reducing the transmittance of the first color light, and a second color resist material 52 for reducing the transmittance of the second color light.

[0071] It is understood that the light output ratio in this application is the transmittance. Accordingly, the light output ratio in the normal viewing direction is the transmittance in the normal viewing direction.

[0072] In some embodiments, in the bending area S2, the transmittance of the first color in the direction of viewing the color deviation improvement layer 50 is a first color deviation transmittance, and the transmittance of the second color light in the direction of viewing the color deviation improvement layer 50 is a second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

[0073] It should be noted that the color deviation improvement layer 50 here includes a planarization layer 53. The first color resist material 51 and the first color resist material 51 mentioned here can be a block structure provided in the planarization layer 53, or a micro-particle structure dispersed in the planarization layer 53. In other embodiments, the first color resist material 51 and the first color resist material 51 can also form a film structure located below the planarization layer 53.

[0074] In other embodiments, the color deviation improvement layer 50 reduces the light-emitting ratio of the first color light in the normal viewing direction, so that the difference between the light-emitting ratios of the first color light, the second color light, and the third color light in the normal viewing direction is reduced to a preset difference. The color deviation improvement layer 50 is provided with a first color resist material 51 for reducing the transmittance of the first color light.

[0075] After research, the inventors found that in sub-bending areas with different bending degrees, the larger the bending angle of the sub-bending area, the greater the blocking effect of the corresponding color blocking material on the corresponding color light, that is, the lower the transmittance of the corresponding color light, the better the color deviation improvement effect.

[0076] In some embodiments, the color deviation improvement layer 50 is fully transparent to the third color light, that is, the transmittance of the third color light in the color deviation improvement layer 50 is 100%.

[0077] Of course, in some other embodiments, the color deviation improvement layer 50 may not be fully transparent to the third color light, but may have a higher transmittance, such as 98%, 99% or even higher.

[0078] In some embodiments, the bending area S2 can be divided into one or more bending sub-areas, and the number of the bending sub-areas is divided according to the angle range of the positive viewing angle of the bending area S2 of the display panel 2; wherein, different bending sub-areas have different transmittances for at least one color of light, and the bending angle of each bending sub-area is a preset angle, and the preset angle is greater than or equal to 5° and less than or equal to 15°.

[0079] For example, the preset angle may be 10°. The specific selection of the preset angle may be set according to the specific conditions of the display panel.

[0080] It is understandable that due to the different bending angles of different sub-bending regions, the degree of color shift varies. Accordingly, the display panel (i.e., the color shift improvement layer) can be configured so that different bending sub-regions have different transmittances for the same color of light, or for two colors of light at the same time, to improve the color shift effect.

[0081] It should be noted that, in the same display panel, the preset angles of different sub-bending regions may be the same or different.

[0082] In addition, the display panel 2 further includes a driving circuit layer 20 disposed between the light emitting layer 30 and the substrate.

[0083] Based on the above description, please refer to Figures 2, 3, 5 and 8 to 10. In some embodiments, the maximum bending angle of the display panel is 20°, that is, its maximum normal viewing angle is 20°. Accordingly, the display panel includes a non-bending area S1 and a bending area S2. The non-bending area S12 is divided into two sub-bending areas S21 and S22. Among them, the bending area S21 is located between the bending area S22 and the non-bending area S1. Here, the bending angles (normal viewing angles) A1 and A2 of the two sub-bending areas S21 and S22 are 10° and 20° respectively.

[0084] Here, the display panel can be set so that the transmittance of the red, green and blue colors in the non-bending area is 100%.

[0085] As shown in Figure 8, before the color deviation improvement layer is provided, in the bending region S21, when the viewing angle is 10°, the transmittances of blue light, green light, and red light in the viewing direction are 97%, 98%, and 100%, respectively. That is, the initial light-emission ratios of blue light, green light, and red light in the viewing direction are 97%, 98%, and 100%, respectively. It can be seen that the initial light-emission ratio of red light in the viewing direction is greater than that of green light, and the initial light-emission ratio of green light in the viewing direction is greater than that of blue light. In the bending region S22, when the viewing angle is 20°, the transmittances of blue light, green light, and red light in the viewing direction (i.e., the initial light-emission ratios) are 84%, 89%, and 92%, respectively.

[0086] As the curvature of the display panel increases, that is, as the normal viewing angle increases, the brightness attenuation ratio (i.e., the transmittance attenuation ratio) of blue light decreases fastest, followed by green light, and the slowest for red light. The color shift reduction layer improves the transmittance of red and green light, ensuring that their transmittances in sub-bend regions S21 and S22 are consistent with the corresponding green light transmittance.

[0087] For example, as shown in Figure 9 , the color shift reduction layer 50 is configured so that, in the bending region S21 , at a normal viewing angle of 10°, the transmittances of blue light, green light, and red light in the normal viewing direction are 100%, 99%, and 97%, respectively. In the bending region S22 , at a normal viewing angle of 20°, the transmittances of blue light, green light, and red light in the normal viewing direction are 91%, 94%, and 100%, respectively.

[0088] As shown in Figure 10 , after the color shift reduction layer 50 is installed, in the bending region S21, at a normal viewing angle of 10°, the transmittances of blue light, green light, and red light in the normal viewing direction are 97%, 97%, and 97%, respectively. In the bending region S22, at a normal viewing angle of 20°, the transmittances of blue light, green light, and red light in the normal viewing direction are 84%, 84%, and 84%, respectively.

[0089] As can be seen, the method of the present application can effectively improve the color shift that occurs in a curved display panel, ensuring that the curved region has the same transmittance for red, green, and blue light. Furthermore, when the display panel is significantly curved (i.e., with a large normal viewing angle), dividing the curved region into different sub-curved regions and addressing the color shift separately for each sub-curved region can achieve even greater improvement.

[0090] It should be noted that, in some other embodiments, the color deviation improvement layer 50 may also be disposed between the encapsulation layer 40 and the light-emitting layer 30 .

[0091] Referring to FIG. 11 and, if necessary, in combination with FIG. 1 to FIG. 10 , the present application provides a method for manufacturing a display panel 2 , which can be used to manufacture the display panel 2 described above. The method for manufacturing the display panel 2 includes the following steps S101 to S107 :

[0092] In step S101 , a correspondence between the normal viewing angle and the normal viewing angle of the display panel is determined among the first color light, the second color light, and the third color light.

[0093] In step S103 , the angle range of the normal viewing angle of the display panel 2 is determined to determine the bending area of ​​the display panel.

[0094] In step S105 , a color shift improvement layer is determined according to the normal viewing angle range of the bending region and the correspondence between the normal viewing angle and the normal viewing angle of the display panel and the first color light, the second color light, and the third color light.

[0095] In step S107 , the display panel is prepared based on the color shift improvement layer.

[0096] The difference in light emission ratios of the first color light, the second color light, and the third color light in the normal viewing direction is 0-8%.

[0097] In some embodiments, the preset difference is 0-5%.

[0098] The inventors have discovered that the smaller the preset difference, the better the color shift improvement effect. Preferably, setting the preset difference to 0 or close to 0 ensures that the first, second, and third color lights have the same or substantially the same light output ratios in the normal viewing direction, thereby substantially unaffecting the overall viewing experience of the user due to the curvature of the display panel.

[0099] In step S101, the correspondence between the light output ratio of the first color light, the second color light and the third color light at the normal viewing angle of the display panel 2 and the normal viewing angle can be determined by calculation and experiment according to the specific conditions such as the material and thickness of the display panel 2.

[0100] 6 and 7 , the following description will be made by taking the first color light being red light, the second color light being green light, and the third color light being blue light as an example.

[0101] In some embodiments, step S101 can determine a corresponding relationship curve between the normal viewing angle and the normal viewing angle of the red light, blue light, and green light of the display panel 2, as shown in FIG6 . Here, R represents red light, G represents green light, B represents blue light, and W represents a mixed light of R, G, and B.

[0102] In step S103 , the angle range of the normal viewing angle of the display panel 2 may be determined by measurement, calculation, etc. according to specific product requirements of the display panel, so as to determine the bending area S2 of the display panel 2 .

[0103] In step S105 , the color deviation improvement layer 50 is determined according to the normal viewing angle range of the bending region and the correspondence between the normal viewing angle and the normal viewing angle of the display panel and the first color light, the second color light, and the third color light.

[0104] In step S105, it can be implemented through the following steps S1051 to S1053:

[0105] In step S1051, first, it is necessary to determine which color light or which two color lights need to adjust the light output ratio based on the angular range of the normal viewing angle of the bending area and the correspondence between the normal viewing angle light output ratio of the first color light, the second color light and the third color light on the display panel and the normal viewing angle.

[0106] Then, in step S1052, the size of the normal viewing angle corresponding to the bending area is determined based on the brightness attenuation ratios of the specific three colors of light at different normal viewing angles, and the brightness attenuation ratio values ​​of each color of light at the normal viewing angle corresponding to the bending area are determined based on the size of the normal viewing angle, such as the attenuation ratio values ​​in the table shown in Figure 8.

[0107] Furthermore, in step S1053 , the transmittance of the color deviation improvement layer for the three color lights of the bending region is determined according to the brightness attenuation ratio of each color light at a normal viewing angle corresponding to the bending region.

[0108] After step S105 , the color deviation improvement layer 50 is determined, which is actually the transmittance of the color deviation improvement layer to the three colors of light in the bending area.

[0109] Then, in step S107 , a color deviation improvement layer 50 is formed according to the obtained transmittance to prepare a display panel with a color deviation improvement function.

[0110] In some embodiments, after step S1051, it can be seen that in the bending area S2, the initial light-emitting ratio of the first color light in the normal viewing direction is greater than the initial light-emitting ratio of the second color light in the normal viewing direction; the initial light-emitting ratio of the second color light in the normal viewing direction is greater than the initial light-emitting ratio of the third color light in the normal viewing direction; the color deviation improvement layer 50 is capable of changing the light-emitting ratio of at least one of the first color light, the second color light, and the third color light in the bending area S2 of the display panel 2, including:

[0111] The light-emitting ratio of the first color light in the normal viewing direction is reduced, or the light-emitting ratios of the first color light and the second color light in the normal viewing direction are reduced simultaneously.

[0112] That is, it is determined that the first color light or the first color light and the second color light are the color lights whose transmittance needs to be adjusted.

[0113] When forming a color shift improvement layer to improve the color shift phenomenon, in some embodiments, the method includes:

[0114] The color shift improvement layer includes a first color resist material for reducing the transmittance of the first color light and a second color resist material for reducing the transmittance of the second color light.

[0115] Among them, in the bending area, the transmittance of the first color in the normal viewing direction of the color deviation improvement layer is the first color deviation transmittance, and the transmittance of the second color light in the normal viewing direction of the color deviation improvement layer is the second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

[0116] Please continue to combine with Figure 6 to obtain that as the curvature of the display panel increases, that is, as the positive viewing angle increases, the brightness attenuation ratio of blue light (that is, the transmittance ratio attenuation) decreases the fastest, followed by green light, and the slowest for red light. That is, the light-emitting ratio of red light in the positive viewing direction is greater than the light-emitting ratio of green light in the positive viewing direction, and the light-emitting ratio of green light in the positive viewing direction is greater than the light-emitting ratio of blue light in the positive viewing direction. That is, the transmittance of red light in the positive viewing direction is greater than the transmittance of green light in the positive viewing direction; the light-emitting ratio of green light in the positive viewing direction is greater than the transmittance of blue light in the positive viewing direction. Please combine with Figures 8 to 10, here, the color deviation improvement layer 50 can be used to simultaneously reduce the light-emitting ratios of red light and green light in the positive viewing direction, and reduce the difference in the light-emitting ratios of the three, thereby improving the color deviation phenomenon. That is, a first color resist material 51 that reduces the light-emitting ratio of red light and a second color resist material 52 that reduces the light-emitting ratio of green light are provided.

[0117] Of course, in other embodiments, the color shift improvement layer may be used to reduce the light output ratio of the first color light in the normal viewing direction to reduce the difference in the light output ratios of the three colors, thereby improving the color shift phenomenon.

[0118] Accordingly, in some embodiments, when forming a color shift improvement layer to improve the color shift phenomenon, the method includes:

[0119] A first color resist material for reducing the transmittance of the first color light is provided in the color deviation improvement layer, so as to reduce the light-emitting ratio of the first color light in the normal viewing direction.

[0120] For example, a first color resist material for reducing the transmittance of red light is provided in the color deviation improvement layer to reduce the light-emitting ratio of red light in the normal viewing direction.

[0121] In some embodiments, the color deviation improvement layer 50 is configured to be fully transparent to the third color light.

[0122] In some embodiments, for a larger bending angle, after determining the bending area, the method further includes:

[0123] The bending area S2 of the display panel 2 is divided into one or more bending sub-areas according to the bending angle of the bending area S2; wherein different bending sub-areas have different transmittances for at least one color of light; the bending angle of each bending sub-area is a preset angle, wherein the preset angle is greater than or equal to 5° and less than or equal to 15°.

[0124] Accordingly, the color shift reduction layer corresponding to each sub-bending region is configured based on the specific sub-bending region's normal viewing angle. For example, the color shift reduction layer corresponding to the first sub-bending region S21 shown in Figure 2 is configured separately from the second sub-bending region S22. The transmittance of each color light is adjusted for each corresponding normal viewing angle, thereby improving color shift in a specific area and achieving a better improvement effect.

[0125] In some embodiments, the display panel 2 includes an encapsulation layer 40 disposed on a side of the light-emitting layer 30 facing away from the substrate 10 ; in step S107 , preparing the display panel 2 based on the color deviation improvement layer 50 includes:

[0126] The color deviation improvement layer 50 is disposed on a side of the encapsulation layer 40 away from the light-emitting layer 30 , or the color deviation improvement layer 50 is disposed between the encapsulation layer 40 and the light-emitting layer 30 .

[0127] In this application, the structural embodiments and method embodiments may complement each other if they do not conflict.

[0128] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "plurality" and "several" refer to two or more, unless otherwise clearly defined.

[0129] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the disclosure herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0130] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A display panel, comprising a non-bending region and at least one bending region located on at least one side of the non-bending region, characterized in that: include: substrate; A light-emitting layer is disposed on the substrate, the light-emitting layer includes a plurality of light-emitting units, each of the light-emitting units includes at least a plurality of light-emitting sub-units, and the plurality of light-emitting sub-units can emit a first color light, a second color light, and a third color light; A color deviation improvement layer is disposed on a side of the light-emitting layer away from the substrate and located in at least one of the bending regions; The difference in the light emission ratio of the first color light, the second color light and the third color light in the front view direction is 0-8%; wherein the front view direction is perpendicular to at least a portion of the surface of the non-bending area.

2. The display panel according to claim 1, wherein: The difference in light emission ratio of the first color light, the second color light and the third color light in the normal viewing direction is 0-5%.

3. The display panel according to claim 1, wherein: In the bending area, the initial light emission ratio of the first color light in the normal viewing direction is greater than the initial light emission ratio of the second color light in the normal viewing direction, and the initial light emission ratio of the second color light in the normal viewing direction is greater than the initial light emission ratio of the third color light in the normal viewing direction; The color deviation improvement layer is provided with a first color resist material for reducing the transmittance of the first color light.

4. The display panel according to claim 1, wherein: In the bending area, the initial light emission ratio of the first color light in the normal viewing direction is greater than the initial light emission ratio of the second color light in the normal viewing direction; the initial light emission ratio of the second color light in the normal viewing direction is greater than the initial light emission ratio of the third color light in the normal viewing direction; The color deviation improvement layer is provided with a first color resist material for reducing the transmittance of the first color light, and a second color resist material for reducing the transmittance of the second color light.

5. The display panel according to claim 4, wherein: In the bending area, the transmittance of the first color in the normal viewing direction of the color deviation improvement layer is the first color deviation transmittance, the transmittance of the second color light in the normal viewing direction of the color deviation improvement layer is the second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

6. The display panel according to any one of claims 1 to 5, characterized in that: The color deviation improvement layer is fully transparent to the third color light; and / or, Among the first color light, the second color light and the third color light, one is red light, one is green light and one is blue light.

7. The display panel according to any one of claims 1 to 5, characterized in that: The bending area can be divided into one or more bending sub-areas, and the number of the bending sub-areas is divided according to the angle range of the positive viewing angle of the bending area of ​​the display panel; wherein different bending sub-areas have different transmittances for at least one color of light, and the bending angle of each bending sub-area is a preset angle, which is greater than or equal to 5° and less than or equal to 15°.

8. The display panel according to any one of claims 1 to 5, characterized in that: The display panel includes an encapsulation layer disposed on a side of the light-emitting layer away from the substrate; wherein the color deviation improvement layer is disposed on a side of the encapsulation layer away from the light-emitting layer, or the color deviation improvement layer is disposed between the encapsulation layer and the light-emitting layer.

9. A method for preparing a display panel, for preparing the display panel according to any one of claims 1 to 8, characterized in that: The method comprises: Determine a correspondence between a normal viewing angle light output ratio of the first color light, the second color light, and the third color light on the display panel and a normal viewing angle; Determine the angle range of the normal viewing angle of the display panel to determine the bending area of ​​the display panel; Determine a color deviation improvement layer according to the angle range of the normal viewing angle of the bending area and the correspondence between the normal viewing angle light emission ratio of the first color light, the second color light and the third color light at the normal viewing angle of the display panel; preparing the display panel according to the color deviation improvement layer; Among them, the first color light, the second color light and the third color light are emitted in the normal viewing direction. The difference in light ratio is 0-8%.

10. The method for manufacturing a display panel according to claim 9, wherein: In the bending area, the initial light emission ratio of the first color light in the normal viewing direction is greater than the initial light emission ratio of the second color light in the normal viewing direction; the initial light emission ratio of the second color light in the normal viewing direction is greater than the initial light emission ratio of the third color light in the normal viewing direction; The step of preparing the display panel according to the color deviation improvement layer comprises: A first color resist material for reducing the transmittance of the first color light is disposed in the color deviation improvement layer, so as to reduce the light emission ratio of the first color light in the normal viewing direction.

11. The method for manufacturing a display panel according to claim 9, wherein: In the bending area, the initial light emission ratio of the first color light in the normal viewing direction is greater than the initial light emission ratio of the second color light in the normal viewing direction; the initial light emission ratio of the second color light in the normal viewing direction is greater than the initial light emission ratio of the third color light in the normal viewing direction; The step of preparing the display panel according to the color deviation improvement layer comprises: In the color deviation improvement layer, a first color resist material for reducing the transmittance of the first color light and a second color resist material for reducing the transmittance of the second color light are arranged; Among them, in the bending area, the transmittance of the first color in the front view direction of the color deviation improvement layer is the first color deviation transmittance, the transmittance of the second color light in the front view direction of the color deviation improvement layer is the second color deviation transmittance, and the first color deviation transmittance is less than or equal to the second color deviation transmittance.

12. The method for preparing a display panel according to any one of claims 9 to 11, characterized in that: The method further comprises: The bending area of ​​the display panel is divided into one or more bending sub-areas according to the bending angle of the bending area; wherein different bending sub-areas have different transmittances for at least one color of light; the bending angle of each bending sub-area is a preset angle, wherein the preset angle is greater than or equal to 5° and less than or equal to 15°.

13. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 8.

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