A display panel, a manufacturing method thereof, and a display device

Abstract

The present invention provides a display panel, a manufacturing method thereof, and a display device. The display panel comprises: a base substrate, sub-pixels of multiple colors located on the base substrate, and a temperature-sensing control structure located on the light-emitting side of at least one sub-pixel of a color. The orthographic projection of the temperature-sensing control structure on the base substrate and the orthographic projection of the corresponding sub-pixel on the base substrate at least partially overlap, and the chromaticity of the temperature-sensing control structure changes accordingly during temperature changes. This is used to avoid color cast problems on white screens and ensure display quality.

Description

Technical Field

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

[0002] Organic Electroluminescence Display (OLED) is gradually replacing liquid crystal display as the mainstream display technology due to its advantages such as light weight, self-luminescence, wide viewing angle, fast response speed, low brightness and low power consumption. OLED display screens are generally composed of a combination of three sub-pixels: red, green and blue. The red, green and blue pixels can be mixed into white light according to certain color coordinates and brightness ratios. Generally, when the driving current remains constant, the color coordinates and brightness of the red, green and blue pixels will also remain unchanged. However, with large changes in ambient temperature, the characteristics of the red, green and blue luminescent materials will be affected. If the characteristics such as brightness or driving voltage of the three luminescent materials do not change in the same trend, the white screen will be color cast. For example, from room temperature to low temperature, the brightness of blue light decays and the brightness of red light increases, which will cause the white screen of OLED devices to appear yellow at low temperatures.

[0003] How to avoid color cast of white images caused by temperature changes has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present invention provides a display panel, a manufacturing method thereof and a display device, which are used to avoid the problem of color cast of white images and ensure the display effect.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0006] A base substrate, sub-pixels of multiple colors located on the base substrate, and a temperature sensing and control structure located on the light-emitting side of at least one sub-pixel of a color;

[0007] The orthographic projection of the temperature-sensing control structure on the substrate and the orthographic projection of the corresponding sub-pixel on the substrate at least partially overlap, and the chromaticity of the temperature-sensing control structure changes accordingly during temperature changes.

[0008] In one possible implementation, the sub-pixels of multiple colors include red sub-pixels, green sub-pixels, and blue sub-pixels, wherein one red sub-pixel, one green sub-pixel, and one blue sub-pixel constitute a luminous pixel; the temperature-sensing control structure is located on the light-emitting side of the blue sub-pixel, and as the temperature rises, the chromaticity of the temperature-sensing control structure decreases.

[0009] In a possible implementation, the device further includes a thin film encapsulation layer located on a side of the light-emitting pixel away from the base substrate, and the temperature sensing control structure is located on a side of the thin film encapsulation layer away from the base substrate.

[0010] In one possible implementation, it also includes a polarizer located on the side of the thin film encapsulation layer facing away from the base substrate, and a flat layer located between the thin film encapsulation layer and the polarizer, wherein the flat layer is provided with a via hole at a position corresponding to each blue sub-pixel, and the via hole is filled with the temperature-sensing control structure composed of a glue material doped with a temperature-variable material.

[0011] In a possible implementation, a color filter is further included on a side of the thin film encapsulation layer facing away from the base substrate, and the temperature sensing control structure is multiplexed as a blue color resist of the color filter.

[0012] In one possible implementation, it also includes a thin film encapsulation layer located on the side of the light-emitting pixel away from the base substrate. Along the light-emitting direction of the light-emitting pixel, the thin film encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer arranged in sequence away from the base substrate. The organic layer is arranged at a corresponding position other than the blue sub-pixel, and the temperature-sensing control structure is arranged at the corresponding position of the blue sub-pixel. The temperature-sensing control structure is composed of an organic material doped with a temperature-variable material.

[0013] In a possible implementation, the temperature sensing and regulating structure is transparent at 25°C, and is bluish at temperatures below 25°C.

[0014] In a possible implementation, the temperature-sensing control structure exhibits a first chromaticity at 25° C., and exhibits a second chromaticity that is smaller than the first chromaticity at a temperature higher than 25° C.

[0015] In a second aspect, an embodiment of the present invention further provides a display device, including:

[0016] A display panel as described in any one of the above.

[0017] In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, comprising:

[0018] forming sub-pixels of multiple colors on a substrate;

[0019] forming a temperature-sensing control structure on the light-emitting side of at least one color sub-pixel;

[0020] The orthographic projection of the temperature-sensing control structure on the substrate and the orthographic projection of the corresponding sub-pixel on the substrate at least partially overlap, and the chromaticity of the temperature-sensing control structure changes accordingly during temperature changes.

[0021] In one possible implementation, the multiple color sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and one red sub-pixel, one green sub-pixel, and one blue sub-pixel constitute a light-emitting pixel. The temperature sensing and control structure is formed on the light-emitting side of at least one color sub-pixel, including:

[0022] A temperature-sensing control structure is formed on the light-emitting side of the blue sub-pixel, wherein the chromaticity of the temperature-sensing control structure tends to decrease as the temperature tends to increase.

[0023] In one possible implementation, a temperature-sensing control structure is formed on the light-emitting side of the blue sub-pixel, including:

[0024] forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel;

[0025] Coating a whole layer of adhesive material on the side of the thin film encapsulation layer facing away from the base substrate to form a flat layer;

[0026] Etching away portions of the planar layer corresponding to the blue sub-pixel using a photolithography process to form via holes at positions corresponding to the blue sub-pixel;

[0027] Filling the via hole with glue doped with temperature-variable material to form a temperature-sensing control structure.

[0028] In a possible implementation, after forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel, the method further includes:

[0029] A color filter is formed on a side of the thin film encapsulation layer facing away from the base substrate, wherein the temperature sensing control structure is multiplexed as a blue color resist of the color filter.

[0030] In a possible implementation, forming a color filter on a side of the thin film encapsulation layer facing away from the base substrate includes:

[0031] A pattern of a light shielding portion is formed on a side of the thin film encapsulation layer facing away from the base substrate, wherein the light shielding portion is provided with an opening at a position corresponding to each sub-pixel;

[0032] Filling the temperature-sensing control structure into the opening at the position corresponding to the blue sub-pixel;

[0033] Filling the red color resist into the opening at the position corresponding to the red sub-pixel, and filling the green color resist into the opening at the position corresponding to the green sub-pixel;

[0034] A color resist including the red color resist, the green color resist, and the blue color resist, and a color filter including the color resist and the light shielding portion are formed.

[0035] In one possible implementation, a temperature-sensing control structure is formed on the light-emitting side of the blue sub-pixel, including:

[0036] forming a first inorganic layer on the light-emitting side of the light-emitting pixel;

[0037] An inkjet printing process is used to arrange an organic material doped with a temperature-variable material at a corresponding position of the blue sub-pixel on a side of the first inorganic layer away from the base substrate to form a temperature-sensing control structure.

[0038] The beneficial effects of the present invention are as follows:

[0039] An embodiment of the present invention provides a display panel, a manufacturing method thereof, and a display device, wherein the display panel includes a base substrate, sub-pixels of multiple colors located on the base substrate, and a temperature-sensitive control structure located on the light-emitting side of at least one color sub-pixel; wherein the orthographic projection of the temperature-sensitive control structure on the base substrate and the orthographic projection of the corresponding sub-pixel on the base substrate at least partially overlap, and during temperature changes, the chromaticity of the temperature-sensitive control structure changes accordingly. For example, during temperature rise, the chromaticity of the temperature-sensitive control structure changes from high to low. For another example, during temperature drop, the chromaticity of the temperature-sensitive control structure changes from low to high. In this way, the temperature-sensitive control structure can be set according to actual application needs to compensate and adjust the color coordinates of the corresponding sub-pixels, thereby avoiding the color cast problem of the white screen and ensuring the display effect.

[0040] In one exemplary embodiment, the sub-pixels of multiple colors include red, green, and blue sub-pixels. One red, one green, and one blue sub-pixel constitute a light-emitting pixel. The temperature-sensing control structure is located on the light-emitting side of the blue sub-pixel, and as the temperature rises, the chromaticity of the temperature-sensing control structure decreases. As the temperature rises, the chromaticity of the temperature-sensing control structure changes accordingly and decreases. For example, at room temperature, the color coordinates of the blue sub-pixel are (0.140, 0.049); at low temperatures, the color coordinates of the blue sub-pixel are (0.139, 0.042). In this way, when the temperature of the display panel changes, the chromaticity change of the temperature-sensing control structure can compensate for the corresponding color coordinates of the blue sub-pixel. In this way, the color offset of the white light mixed by the red, green, and blue sub-pixels is reduced, the color cast problem of the white screen is avoided, and the display effect is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1Schematic diagram showing how the white image of an OLED display panel changes with temperature when the OLED display panel changes from a normal temperature state to a low temperature state of -30°C in the related art;

[0042] Figure 2 for Figure 1 Schematic diagram of the corresponding white light color coordinate changes;

[0043] Figure 3 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0048] Figure 8 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0049] Figure 9 A schematic diagram of a structure of a display panel provided by an embodiment of the present invention;

[0050] Figure 10 for Figure 6 A schematic diagram of one of the light transmission spectra corresponding to the display panel shown;

[0051] Figure 11 for Figure 6 The display panel shown corresponds to a schematic diagram of the change in white light color coordinates;

[0052] Figure 12 A schematic diagram of a structure of a display device provided by an embodiment of the present invention;

[0053] Figure 13 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0054] Figure 14 A flow chart of one method for forming a temperature-sensing control structure on the light-emitting side of a blue sub-pixel in a method for manufacturing a display panel provided by an embodiment of the present invention;

[0055] Figure 15 for Figure 14 One of the corresponding process flow charts;

[0056] Figure 16 A flow chart of one of the steps in a method for manufacturing a display panel provided by an embodiment of the present invention, wherein a color filter is formed on a side of a thin film encapsulation layer facing away from a base substrate;

[0057] Figure 17 for Figure 16 One of the corresponding process flow charts;

[0058] Figure 18 A flow chart of one method for forming a temperature-sensing control structure on the light-emitting side of a blue sub-pixel in a method for manufacturing a display panel provided by an embodiment of the present invention;

[0059] Figure 19 for Figure 18 One of the corresponding process flow charts.

[0060] Description of reference numerals:

[0061] 10-substrate; 20-luminescent pixel; R-red sub-pixel; G-green sub-pixel; B-blue sub-pixel; 30-temperature sensing and control structure; 40-thin-film encapsulation layer; 50-polarizer; 60-flat layer; 600-via; 70-color filter; 71-light-shielding portion; 72-color resist; 721-blue color resist; 722-red color resist; 723-green color resist; 401-first inorganic layer; 402-organic layer; 403-second inorganic layer; 80-pixel definition structure; 90-luminescent functional layer; 73-first flat layer; 74-second flat layer; 100-display panel. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. And in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Unless otherwise defined, technical or scientific terms used in this invention shall have the same general meaning as those generally understood by persons skilled in the art in the art to which this invention pertains. Words such as "include" or "comprise" used in this invention mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0064] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0065] In the related art, the inventors found in actual research that the key characteristic parameters of the red sub-pixel (R), green sub-pixel (G) and blue sub-pixel (B) in the OLED device are color coordinates and brightness. Among them, for OLED devices without a color filter structure, the color coordinates of the sub-pixel are generally determined by the characteristics of the luminescent material. After the OLED device is prepared, the color coordinates generally do not change. By adjusting the ratio of RGB brightness, any color desired within the color gamut can be obtained. As shown in Table 1, the brightness and color coordinates required for the RGB synthetic white light W (500nit, 0.300, 0.310) of a certain OLED display panel under normal temperature conditions. Among them, (CIEx, CIEy) in the table represents the color coordinates of the corresponding sub-pixel, and "Lum" represents the brightness of the corresponding sub-pixel.

[0066] sub-pixel R G B W CIEx 0.680 0.260 0.140 0.300 CIE 0.315 0.705 0.049 0.310 Lum 116 346 37 500

[0067] Table 1

[0068] The OLED display panel was placed at -30°C and the RGBW color coordinates and brightness were tested, yielding the results shown in Table 2. In Table 2, "↑" indicates an increase compared to the corresponding value in Table 1, and "↓" indicates a decrease compared to the corresponding value in Table 1.

[0069] sub-pixel R G B W CIEx 0.680 0.260 0.140 0.316 CIE 0.315 0.705 0.049 0.331 Lum 120↑ 347 31↓ 498

[0070] Table 2

[0071] According to Tables 1 and 2, when the OLED display panel is adjusted from room temperature to a low temperature state corresponding to -30°C, the brightness of the red light increases and the brightness of the blue light decreases, causing the color coordinates of the white light to change from (0.300, 0.310) to (0.316, 0.331). Accordingly, the white light color offset is 3.6JNCD, where JNCD represents the minimum color change that the human eye can perceive. In addition, when the OLED display panel is changed from room temperature to a low temperature state of -30°C, the display of the white screen of the corresponding OLED display panel with temperature changes is shown as follows: Figure 1 As shown, the color coordinates of white light change as Figure 2 In this case, from room temperature to low temperature, the brightness of blue light decreases and the brightness of red light increases, which can easily cause the white screen of OLED devices to turn yellow at low temperatures.

[0072] In view of this, embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device, which are used to avoid the color cast problem of white screens and ensure the display effect.

[0073] like Figure 3 As shown, an embodiment of the present invention provides a display panel, which includes:

[0074] A base substrate 10, sub-pixels Sp of multiple colors located on the base substrate 10, and a temperature sensing control structure 30 located on the light-emitting side of at least one color sub-pixel Sp;

[0075] The orthographic projection of the temperature-sensing control structure 30 on the base substrate 10 and the orthographic projection of the corresponding sub-pixel Sp on the base substrate 10 at least partially overlap, and the chromaticity of the temperature-sensing control structure 30 changes accordingly during temperature changes.

[0076] In a specific implementation, the display panel includes a base substrate 10, sub-pixels Sp of multiple colors located on the base substrate 10, and a temperature-sensing control structure 30 located on the light-emitting side of at least one color sub-pixel. The base substrate 10 can be a rigid substrate or a flexible substrate, without limitation. In one exemplary embodiment, the sub-pixels Sp of multiple colors include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. In another exemplary embodiment, the sub-pixels Sp of multiple colors include a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W. Of course, the colors of the sub-pixels Sp of multiple colors can be set according to actual application needs, without limitation. Furthermore, the temperature-sensing control structure 30 is located on the light-emitting side of at least one color sub-pixel. For example, each color sub-pixel in the multiple colors is provided with a separate temperature-sensing control structure 30 on its light-emitting side. For another example, among the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B, the temperature-sensing control structure 30 is located only on the light-emitting side of the red sub-pixel R. Figure 3 The figure shows that the temperature-sensing control structure 30 is set in the sub-pixels Sp of two colors, but it is not limited to this. Of course, the positional relationship between the temperature-sensing control structure 30 and the sub-pixels Sp of multiple colors can be set according to actual application needs and is not limited here.

[0077] Furthermore, the orthographic projection of the temperature-sensing control structure 30 on the base substrate 10 and the orthographic projection of the corresponding sub-pixel on the base substrate 10 at least partially overlap, and the chromaticity of the temperature-sensing control structure 30 changes accordingly as the temperature changes. For example, as the temperature rises, the chromaticity of the temperature-sensing control structure 30 changes from high to low. Another example is that as the temperature drops, the chromaticity of the temperature-sensing control structure changes from low to high. In this way, the temperature-sensing control structure can be configured according to actual application needs to compensate for and adjust the color coordinates of the corresponding sub-pixels, thereby avoiding color cast issues in white images and ensuring the display quality.

[0078] In one exemplary embodiment, Figure 4 As shown, the sub-pixels Sp of multiple colors include a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B, wherein a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B constitute a light-emitting pixel 20; the temperature-sensing control structure 30 is located on the light-emitting side of the blue sub-pixel B, and as the temperature rises, the chromaticity of the temperature-sensing control structure 30 decreases.

[0079] In a specific implementation, the sub-pixels Sp of multiple colors include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, wherein one red sub-pixel R, one green sub-pixel G, and one blue sub-pixel B constitute a light-emitting pixel 20. In practical applications, there are multiple light-emitting pixels 20, which can be arranged in an array on the substrate 10. Figure 4 The diagram shows a case of a light-emitting pixel 20, but it is certainly not limited to this. In addition, the temperature-sensing control structure 30 is located on the light-emitting side of the blue sub-pixel B, and the orthographic projection of the temperature-sensing control structure 30 on the base substrate 10 and the orthographic projection of the corresponding blue sub-pixel B on the base substrate 10 at least partially overlap. When the temperature rises, the chromaticity of the temperature-sensing control structure 30 decreases. For example, at room temperature, the color coordinates of the blue sub-pixel B are (0.140, 0.049); at low temperatures, the color coordinates of the blue sub-pixel B are (0.139, 0.042). In this way, when the temperature of the display panel changes, the chromaticity change of the temperature-sensing control structure 30 can compensate for the color coordinates of the blue sub-pixel B. In this way, the color offset of the white light mixed by the red, green and blue sub-pixels is reduced, the color cast problem of the white screen is avoided, and the display effect is guaranteed.

[0080] In an embodiment of the present invention, the display panel further includes a thin film encapsulation layer 40 located on a side of the light-emitting pixel 20 away from the base substrate 10 , and the temperature sensing control structure 30 is located on a side of the thin film encapsulation layer 40 away from the base substrate 10 .

[0081] In a specific implementation process, the display panel further includes a thin film encapsulation layer 40 (Thin Film Encapsulation, TFE) located on the side of the light-emitting pixel 20 away from the base substrate 10. Accordingly, the temperature sensing and control structure 30 can be arranged in a variety of ways, such as Figure 5 In the exemplary embodiment shown, the temperature sensing and regulating structure 30 is located on a side of the thin film encapsulation layer 40 facing away from the base substrate 10 .

[0082] In one exemplary embodiment, Figure 6 As shown, the display panel also includes a polarizer 50 located on the side of the thin film encapsulation layer 40 away from the base substrate 10, and a flat layer 60 located between the thin film encapsulation layer 40 and the polarizer 50. The flat layer 60 is provided with a via 600 at a position corresponding to each blue sub-pixel B, and the via 600 is filled with the temperature sensing control structure 30 composed of a glue material doped with a temperature-changing material.

[0083] Still combined Figure 6 As shown, the display panel also includes a polarizer 50 located on the side of the thin film encapsulation layer 40 away from the base substrate 10. The polarizer 50 can not only reduce the reflection of the display panel to the external ambient light, thereby improving the user experience, but also avoid the influence of the external ambient light on the organic light-emitting material, thereby ensuring the life of the organic light-emitting material and improving the performance of the display panel. In addition, the display panel also includes a flat layer 60 located between the thin film encapsulation layer 40 and the polarizer 50. The flat layer 60 can be an optically clear adhesive (OCA), which is not limited here. Figure 5 As shown, the planar layer 60 has vias 600 at locations corresponding to each blue sub-pixel B. The vias 600 are filled with a temperature-sensitive control structure 30 composed of a glue material doped with a temperature-sensitive material. In one exemplary embodiment, a mixed solution of a temperature-sensitive material and an optical glue solution can be filled into the vias 600 and cured to form the temperature-sensitive control structure 30.

[0084] In one exemplary embodiment, Figure 7 As shown, the display panel further includes a color filter 70 located on a side of the thin film encapsulation layer 40 away from the base substrate 10 , and the temperature sensing control structure 30 is multiplexed as a blue color resist 721 of the color filter 70 .

[0085] Still combined Figure 7As shown, the display panel also includes a color filter 70 located on the side of the thin film encapsulation layer 40 away from the base substrate 10. In this case, a color filter on encapsulation 70 (Color Filter On Encapsulation, COE) technology can be used. Compared with the thicker polarizer 50, the light and thin design of the display panel is guaranteed. In this exemplary embodiment, the temperature sensing control structure is reused as the blue color resist 721 of the color filter 70. In the specific implementation process, the color filter 70 includes a light shielding portion 71 and a color resist 72, wherein the light shielding portion 71 is provided with an opening at the corresponding position of each sub-pixel, and the color resist 72 includes not only the blue color resist 721, but also a red color resist 722 and a green color resist 723, and each color resist is provided in the opening corresponding to the corresponding color sub-pixel. Among them, the blue color resist 721 in the embodiment of the present invention is a structure formed by mixing a temperature-changing material with the original blue color resist 721 solution.

[0086] In one exemplary embodiment, Figure 8 As shown, the display panel also includes a thin film encapsulation layer 40 located on the side of the light-emitting pixel 20 away from the base substrate 10. Along the light-emitting direction of the light-emitting pixel 20, the thin film encapsulation layer 40 includes a first inorganic layer 401, an organic layer 402 and a second inorganic layer 403 arranged in sequence away from the base substrate 10. The organic layer 402 is arranged at a corresponding position other than the blue sub-pixel B, and the temperature-sensing control structure is arranged at the corresponding position of the blue sub-pixel B. The temperature-sensing control structure 30 is composed of an organic material doped with a temperature-variable material.

[0087] Still combined Figure 8 As shown, the display panel also includes a thin film encapsulation layer 40 located on the side of the light-emitting pixel 20 away from the base substrate 10. Along the light-emitting direction of the light-emitting pixel 20, the thin film encapsulation layer 40 includes a first inorganic layer 401, an organic layer 402, and a second inorganic layer 403, which are sequentially arranged away from the base substrate 10. The material of the first inorganic layer 401 can be at least one of silicon oxide, silicon nitride, and silicon oxynitride, and the material of the second inorganic layer 403 can be at least one of silicon oxide, silicon nitride, and silicon oxynitride. The material of the organic layer 402 can be an organic material suitable for inkjet printing, which is not limited here. In addition, the organic layer 402 is arranged at the corresponding position other than the blue sub-pixel B, and the temperature-sensing control structure 30 is arranged at the corresponding position of the blue sub-pixel B. The temperature-sensing control structure 30 is composed of an organic material doped with a temperature-variable material. In this way, while effectively blocking water and oxygen corrosion, the problem of white screen color deviation is avoided, ensuring the lightweight design of the display panel.

[0088] In an embodiment of the present invention, the material properties of the temperature sensing and regulating structure 30 can be set in the following manner.

[0089] In one exemplary embodiment, the temperature sensing and regulating structure 30 is transparent at 25° C., and is bluish at a temperature below 25° C.

[0090] In one exemplary embodiment, the temperature-sensing control structure 30 exhibits a first chromaticity at 25° C. and exhibits a second chromaticity smaller than the first chromaticity at temperatures above 25° C. For example, the temperature-sensing control structure 30 exhibits a dark blue chromaticity at room temperature and exhibits a light blue chromaticity at temperatures above room temperature.

[0091] It should be noted that, unless otherwise specified, "normal temperature" in this article refers to 25°C.

[0092] In a specific implementation, in one exemplary embodiment, the temperature-variable material doped in the temperature-sensing control structure 30 can be an inorganic thermochromic material, including at least one of metal iodides, double salts, transition metal compounds, metal alloys, and metal chlorides. In one exemplary embodiment, the temperature-variable material doped in the temperature-sensing control structure 30 can also be an organic thermochromic material, including at least one of spiropyran, fluoranthene, triarylmethane, substituted ethylene, and an organic complex. Of course, the temperature-variable material can also be selected based on actual application needs, and these are not described in detail here.

[0093] It should be noted that the light-emitting pixels 20 involved in the embodiments of the present invention may include at least one of an organic light-emitting diode (OLED) and a quantum dot light-emitting diode (QLED). The thin film encapsulation layer 40 may also include more film layers alternately arranged with inorganic layers and organic layers, which is not limited here. It should be noted that regardless of the structure of the thin film encapsulation layer 40, the top layer of the thin film encapsulation layer 40 is set as an inorganic layer to effectively block water and oxygen.

[0094] In addition, in addition to the above-mentioned film layer, the display panel in the embodiment of the present invention is combined with Figures 3 to 8 As shown, the display panel further includes a pixel definition structure 80 having openings for accommodating the light-emitting pixels 20, and a light-emitting functional layer 90 located between the light-emitting pixels 20 and the thin-film encapsulation layer 40. The light-emitting functional layer 90 includes an electron transport layer and a cathode layer, which are sequentially separated from the base substrate 10. The pixel definition structure 80 and the light-emitting functional layer 90 can be specifically implemented in the relevant art and will not be described in detail here.

[0095] exist Figure 6 In the exemplary embodiment shown, the display panel further includes a glue layer and a cover plate disposed on the side of the polarizer 50 facing away from the base substrate 10. Figure 7In the exemplary embodiment shown, the display panel further includes a glue layer and a cover plate disposed on the side of the color filter 70 facing away from the base substrate 10. The arrangement of the glue layer and the cover plate can be specifically implemented in accordance with related art and will not be described in detail here. The glue layer may be an optical glue, which ensures both transparency and structural stability of the display panel.

[0096] exist Figure 7 and Figure 8 In the exemplary embodiment shown, the color filter 70 further includes a first planarization layer 73 located between the light shielding portion 71 and the thin-film encapsulation layer 40, and a second planarization layer 74 located on the side of the light shielding portion 71 facing away from the base substrate 10. The first planarization layer 73 and the second planarization layer 74 may be optical adhesives, which are not limited here. This ensures the flatness of subsequent film layers while also maintaining the structural stability of the display panel.

[0097] In one exemplary embodiment, Figure 9 As shown, the temperature sensing and regulating structure 30 can not only be reused as the blue color resist 721 of the color filter 70 , but can also be arranged at a position corresponding to the blue sub-pixel B in the organic layer 402 of the thin film encapsulation layer 40 .

[0098] In one of the exemplary embodiments, the display panel also includes a touch structure (Flexible Multi-Layer On Cell, FMLOC) located on the side of the thin film encapsulation layer 40 away from the base substrate 10. Accordingly, the film layers of the touch structure can be directly manufactured on the thin film encapsulation layer 40. Accordingly, the touch structure is set in the film layer structure, so there is no need to set up a touch substrate separately, thereby ensuring the touch function of the display panel while ensuring the lightweight design of the display panel. For the specific setting of the touch structure, reference can be made to the specific implementation in the relevant technology, which will not be described in detail here. Of course, in addition to the film layer structure mentioned above, the display panel may also include other film layer structures, which can be referred to the specific implementation in the relevant technology, which will not be described in detail here.

[0099] In the embodiment of the present invention, the inventors found that when using Figure 6 When the display panel is shown, the temperature sensing and regulating structure 30 is transparent at room temperature and turns blue at a temperature lower than room temperature. Figure 10 At this time, the display panel changes from a normal temperature state to a low temperature state of -30°C, and the test RGBW screen color coordinates and brightness are shown in Table 3.

[0100] sub-pixel R G B W CIEx 0.680 0.260 0.140 0.316 CIE 0.315 0.705 0.049 0.331 Lum 120↑ 347 31↓ 498

[0101] Table 3

[0102] Table 3 shows the situation of synthesizing white light after the blue light color coordinates change from (0.140, 0.049) to (0.139, 0.042) when the normal temperature state is adjusted to the low temperature state of -30℃. Figure 11 As shown, the white light color shift is only 0.8 JNCD, significantly reducing the yellowing phenomenon at low temperatures. In a specific implementation, the luminescence spectrum of a conventional blue light device can be integrated with the transmission spectrum of the temperature-sensitive material to obtain the luminescence spectrum of the blue light device equipped with the temperature-sensitive control structure 30. Furthermore, when the room temperature changes to a low temperature, the transmission spectrum of the temperature-sensitive material changes, and the luminescence spectrum of the blue light device equipped with the temperature-sensitive control structure 30 changes accordingly. The color coordinates change accordingly, allowing for compensatory adjustments to the corresponding color coordinates of the blue sub-pixel B. This reduces the color shift of the white light generated by the mixture of red, green, and blue sub-pixels, avoids color cast issues on the white screen, and ensures the display quality.

[0103] Based on the same inventive concept, Figure 12 As shown, an embodiment of the present invention further provides a display device, the principle of which is similar to that of the aforementioned display panel 100, so the implementation of the display device can refer to the implementation of the aforementioned display panel 100, and the repeated parts will not be repeated.

[0104] In specific implementations, the display device provided by the embodiments of the present invention can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigation system, or the like. Other essential components of the display device are well understood by those skilled in the art and are not described in detail here, nor should they be construed as limitations of the present invention.

[0105] Based on the same inventive concept, Figure 13 As shown, an embodiment of the present invention further provides a method for manufacturing the display panel as described above, the manufacturing method comprising:

[0106] S101: forming sub-pixels of multiple colors on a substrate;

[0107] S102: forming a temperature sensing and regulating structure on a light-emitting side of at least one color sub-pixel;

[0108] The orthographic projection of the temperature-sensing control structure on the substrate and the orthographic projection of the corresponding sub-pixel on the substrate at least partially overlap, and the chromaticity of the temperature-sensing control structure changes accordingly during temperature changes.

[0109] In one exemplary embodiment, the multiple color sub-pixels Sp include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. One red sub-pixel R, one green sub-pixel G, and one blue sub-pixel B constitute a light-emitting pixel 20. The temperature sensing control structure 30 is formed on the light-emitting side of at least one color sub-pixel, including:

[0110] A temperature-sensing control structure is formed on the light-emitting side of the blue sub-pixel, wherein the chromaticity of the temperature-sensing control structure tends to decrease as the temperature tends to increase.

[0111] In this exemplary embodiment, Figure 4 Taking the display panel shown in FIG. 1 as an example, the specific implementation process of steps S101 to S102 is as follows:

[0112] First, a light-emitting pixel 20 including a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B is formed on a substrate. In one exemplary embodiment, a vacuum evaporation process can be used to form the red sub-pixel R, green sub-pixel G, and blue sub-pixel B on the substrate 10. In another exemplary embodiment, an inkjet printing process can also be used to print the red sub-pixel R, green sub-pixel G, and blue sub-pixel B on the substrate 10, thereby forming the light-emitting pixel 20 including the red sub-pixel R, green sub-pixel G, and blue sub-pixel B. Of course, the specific preparation process of the light-emitting pixel 20 can be prepared according to actual application needs and is not limited here. Then, a temperature-sensing control structure 30 is formed on the light-emitting side of the blue sub-pixel B. The specific preparation process of the temperature-sensing control structure 30 can be referred to the description of the relevant section below and is not described in detail here. The orthographic projection of the temperature-sensing control structure 30 on the substrate 10 and the orthographic projection of the corresponding blue sub-pixel B on the substrate 10 at least partially overlap, and the chromaticity of the temperature-sensing control structure 30 decreases as the temperature increases. For example, at room temperature, the color coordinates of blue sub-pixel B are (0.140, 0.049); at low temperatures, the color coordinates of blue sub-pixel B are (0.139, 0.042). Thus, when the temperature of the display panel changes, the chromaticity change of the temperature-sensing control structure 30 can compensate for the color coordinates of the corresponding blue sub-pixel B. This reduces the color offset of the white light generated by the mixture of red, green, and blue sub-pixels, avoids color cast on the white screen, and ensures the display quality.

[0113] In an embodiment of the present invention, the temperature sensing and regulating structure 30 can be prepared by the following methods. In one exemplary embodiment, Figure 14 As shown, the step: forming a temperature sensing and regulating structure on the light-emitting side of the blue sub-pixel includes:

[0114] S201: forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel;

[0115] S202: coating a whole layer of adhesive material on a side of the thin film encapsulation layer facing away from the base substrate to form a flat layer;

[0116] S203: etching away a portion of the planar layer corresponding to the blue sub-pixel using a photolithography process, thereby forming a via hole at the position corresponding to the blue sub-pixel in the planar layer;

[0117] S204: Filling the via hole with a glue material doped with a temperature-variable material to form a temperature-sensing control structure.

[0118] In the specific implementation process, Figure 6 Taking the display panel shown in FIG. 1 as an example, the specific implementation process of steps S201 to S204 is as follows:

[0119] First, a thin film encapsulation layer 40 is formed on the light-emitting side of the light-emitting pixel 20; then, a whole layer of glue is applied on the side of the thin film encapsulation layer 40 away from the base substrate 10 to form a flat layer 60; then, a photolithography process is used to etch away the portion of the flat layer 60 corresponding to the blue sub-pixel B, thereby forming a via 600 in the flat layer 60 corresponding to the blue sub-pixel B; then, the temperature-variable material and the glue are fully mixed to form a glue doped with the temperature-variable material; then, a glue doped with the temperature-variable material is applied on the side of the flat layer 60 away from the base substrate 10, thereby filling the corresponding glue into the via 600. It should be noted that when applying the glue doped with the temperature-variable material, in addition to the glue doped with the temperature-variable material in the via 600, some glue will remain in other areas due to process errors. The glue in other areas can be etched away by a photolithography process, thereby forming a temperature-sensing control structure 30 accommodated in the via 600, thereby ensuring the setting accuracy of the temperature-sensing control structure 30. Correspondingly Figure 14 One of the process flow charts corresponding to the method flow chart shown is as follows Figure 15 shown.

[0120] In one exemplary embodiment, after step S201: forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel, the method further includes:

[0121] A color filter is formed on a side of the thin film encapsulation layer facing away from the base substrate, wherein the temperature sensing control structure is multiplexed as a blue color resist of the color filter.

[0122] like Figure 16 As shown, the step of forming a color filter on the side of the thin film encapsulation layer away from the base substrate includes:

[0123] S301: forming a pattern of a light shielding portion on a side of the thin film encapsulation layer facing away from the base substrate, wherein the light shielding portion is provided with an opening at a position corresponding to each sub-pixel;

[0124] S302: Filling the temperature-sensing control structure into the opening at the position corresponding to the blue sub-pixel;

[0125] S303: Filling the opening at the position corresponding to the red sub-pixel with a red color resist, and filling the opening at the position corresponding to the green sub-pixel with a green color resist;

[0126] S304: forming a color resist including the red color resist, the green color resist, and the blue color resist, and a color filter including the color resist and the light shielding portion.

[0127] In the specific implementation process, Figure 7 Taking the display panel shown in FIG. 1 as an example, the specific implementation process of steps S301 to S304 is as follows:

[0128] First, a layer of optical adhesive is applied to the side of the thin film encapsulation layer 40 facing away from the base substrate 10 to form a first flat layer 73. Then, a pattern of a light shielding portion 71 is formed on the side of the first flat layer 73 facing away from the base substrate 10. The light shielding portion 71 has openings at the corresponding positions of each sub-pixel. The light shielding portion 71 can be a black matrix (BM). Then, the temperature-sensing control structure 30 is filled into the opening corresponding to the position of the blue sub-pixel B and reused as the blue color resist 721 of the color filter 70. In actual applications, the blue color resist 721 can be a color resist doped with a temperature-changing material in a conventional blue color resist. The red color resist 722 can also be filled into the opening corresponding to the position of the red sub-pixel R, and the green color resist 723 can be filled into the opening corresponding to the position of the green sub-pixel G. It should be noted that the filling order of the corresponding color resists can be set according to the actual application needs and is not limited here. In addition, among the various color resists, only the blue color resist 721 is doped with a temperature-changing material. In practical applications, an inkjet printing process can be used to fill the openings of the corresponding sub-pixels with color resists of the corresponding colors, which will not be described in detail here. Then, a layer of optical adhesive is applied to the side of the color resist 72 facing away from the base substrate 10 to form a second flat layer 74. In this way, a color resist 72 including red color resist 722, green color resist 723 and blue color resist 721, and a color filter including the color resist 72 and the light-shielding portion are formed. Accordingly, Figure 16 One of the process flow charts corresponding to the method flow chart shown is as follows Figure 17 In one exemplary embodiment, as shown in FIG. Figure 18 As shown, the step: forming a temperature sensing and regulating structure on the light-emitting side of the blue sub-pixel includes:

[0129] S401: forming a first inorganic layer on the light-emitting side of the light-emitting pixel;

[0130] S402: using an inkjet printing process, disposing an organic material doped with a temperature-variable material at a corresponding position of the blue sub-pixel on a side of the first inorganic layer away from the base substrate to form a temperature-sensing control structure.

[0131] In the specific implementation process, Figure 7 Taking the display panel shown in FIG. 1 as an example, the specific implementation process of steps S401 to S402 is as follows:

[0132] First, a first inorganic layer 401 is deposited on the light-emitting side of the light-emitting pixel 20; then, an inkjet printing process can be used to print an organic material doped with a temperature-variable material to the corresponding position of the blue sub-pixel B on the side of the first inorganic layer 401 away from the base substrate 10, thereby forming a temperature-sensing control structure 30. In addition, an inkjet printing process can also be used to print the organic layer 402 to the corresponding position other than the blue sub-pixel B. Then, a second inorganic layer 403 can be formed on the side of the organic layer 402 away from the base substrate 10, thereby forming a thin film encapsulation layer 40 including the first inorganic layer 401, the organic layer 402, the temperature-sensing control structure 30 and the second inorganic layer 403. Accordingly, Figure 18 The process flow chart corresponding to the method flow chart shown is as follows Figure 19 shown.

[0133] Embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device. The display panel includes a base substrate 10, light-emitting pixels 20 located on the base substrate 10 and comprising a red subpixel R, a green subpixel G, and a blue subpixel B, and a temperature-sensing control structure 30 located on the light-emitting side of the blue subpixel B. The orthographic projection of the temperature-sensing control structure 30 on the base substrate 10 and the orthographic projection of the corresponding blue subpixel B on the base substrate 10 at least partially overlap, and the chromaticity of the temperature-sensing control structure 30 decreases as the temperature increases. As the temperature increases, the chromaticity of the temperature-sensing control structure 30 changes accordingly and decreases. For example, at room temperature, the color coordinates of the blue subpixel B are (0.140, 0.049); at low temperatures, the color coordinates of the blue subpixel B are (0.139, 0.042). In this way, when the temperature of the display panel changes, the change in the chromaticity of the temperature-sensing control structure 30 can compensate for the corresponding color coordinates of the blue subpixel B. In this way, the color offset of the white light mixed with the red, green and blue sub-pixels is reduced, the color cast problem of the white screen is avoided, and the display effect is guaranteed.

[0134] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0135] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A display panel, characterized in that: include: A base substrate, sub-pixels of multiple colors located on the base substrate, and a temperature sensing and control structure located on the light-emitting side of at least one sub-pixel of a color; In which, the orthographic projection of the temperature-sensing control structure on the substrate and the orthographic projection of the corresponding sub-pixel on the substrate at least partially overlap, and during the temperature change, the chromaticity of the temperature-sensing control structure changes accordingly; during the temperature rise, the chromaticity of the temperature-sensing control structure shows a downward trend; during the temperature fall, the chromaticity of the temperature-sensing control structure shows an upward trend.

2. The display panel according to claim 1, wherein The sub-pixels of multiple colors include red sub-pixels, green sub-pixels and blue sub-pixels, wherein one red sub-pixel, one green sub-pixel and one blue sub-pixel constitute a luminous pixel; the temperature-sensing control structure is located on the light-emitting side of the blue sub-pixel, and as the temperature rises, the chromaticity of the temperature-sensing control structure decreases.

3. The display panel according to claim 2, wherein: It also includes a thin film encapsulation layer located on a side of the light-emitting pixel away from the base substrate, and the temperature sensing control structure is located on a side of the thin film encapsulation layer away from the base substrate.

4. The display panel according to claim 3, wherein: It also includes a polarizer located on the side of the thin film encapsulation layer away from the base substrate, and a flat layer located between the thin film encapsulation layer and the polarizer. The flat layer is provided with vias at the corresponding position of each blue sub-pixel, and the vias are filled with the temperature-sensing control structure composed of a glue material doped with a temperature-changing material.

5. The display panel according to claim 3, wherein: It also includes a color filter located on the side of the thin film encapsulation layer away from the base substrate, and the temperature sensing control structure is multiplexed as the blue color resistance of the color filter.

6. The display panel according to claim 2, wherein: It also includes a thin film encapsulation layer located on the side of the light-emitting pixel away from the base substrate. Along the light-emitting direction of the light-emitting pixel, the thin film encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer arranged in sequence away from the base substrate. The organic layer is arranged at a corresponding position other than the blue sub-pixel. The temperature-sensing control structure is arranged at the corresponding position of the blue sub-pixel. The temperature-sensing control structure is composed of an organic material doped with a temperature-changing material.

7. The display panel according to any one of claims 2 to 6, wherein: The temperature sensing and regulating structure is transparent at 25° C., and is bluish at temperatures below 25° C.

8. The display panel according to any one of claims 2 to 6, wherein: The temperature-sensing control structure exhibits a first chromaticity at 25° C., and exhibits a second chromaticity smaller than the first chromaticity at a temperature higher than 25° C.

9. A display device, characterized in that: include: The display panel according to any one of claims 1 to 8.

10. A method for manufacturing a display panel, characterized in that: include: forming sub-pixels of multiple colors on a substrate; forming a temperature-sensing control structure on the light-emitting side of at least one color sub-pixel; In which, the orthographic projection of the temperature-sensing control structure on the substrate and the orthographic projection of the corresponding sub-pixel on the substrate at least partially overlap, and during the temperature change, the chromaticity of the temperature-sensing control structure changes accordingly; during the temperature rise, the chromaticity of the temperature-sensing control structure shows a downward trend; during the temperature fall, the chromaticity of the temperature-sensing control structure shows an upward trend.

11. The production method according to claim 10, characterized in that: The sub-pixels of the multiple colors include red sub-pixels, green sub-pixels, and blue sub-pixels. One red sub-pixel, one green sub-pixel, and one blue sub-pixel constitute a light-emitting pixel. The temperature sensing and regulating structure is formed on the light-emitting side of at least one color sub-pixel, including: A temperature-sensing control structure is formed on the light-emitting side of the blue sub-pixel, wherein the chromaticity of the temperature-sensing control structure tends to decrease as the temperature tends to increase.

12. The production method according to claim 11, wherein: A temperature sensing and regulating structure is formed on the light-emitting side of the blue sub-pixel, including: forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel; Coating a whole layer of adhesive material on the side of the thin film encapsulation layer facing away from the base substrate to form a flat layer; Etching away portions of the planar layer corresponding to the blue sub-pixel using a photolithography process to form via holes at positions corresponding to the blue sub-pixel; Filling the via hole with glue doped with temperature-variable material to form a temperature-sensing control structure.

13. The production method according to claim 12, characterized in that: After forming a thin film encapsulation layer on the light-emitting side of the light-emitting pixel, the method further includes: A color filter is formed on a side of the thin film encapsulation layer facing away from the base substrate, wherein the temperature sensing control structure is multiplexed as a blue color resist of the color filter.

14. The production method according to claim 13, wherein: A color filter is formed on a side of the thin film encapsulation layer facing away from the base substrate, comprising: A pattern of a light shielding portion is formed on a side of the thin film encapsulation layer facing away from the base substrate, wherein the light shielding portion is provided with an opening at a position corresponding to each sub-pixel; Filling the temperature-sensing control structure into the opening at the position corresponding to the blue sub-pixel; Filling the red color resist into the opening at the position corresponding to the red sub-pixel, and filling the green color resist into the opening at the position corresponding to the green sub-pixel; A color resist including the red color resist, the green color resist, and the blue color resist, and a color filter including the color resist and the light shielding portion are formed.

15. The manufacturing method according to claim 11, wherein: A temperature sensing and regulating structure is formed on the light-emitting side of the blue sub-pixel, including: forming a first inorganic layer on the light-emitting side of the light-emitting pixel; An inkjet printing process is used to arrange an organic material doped with a temperature-variable material at a corresponding position of the blue sub-pixel on a side of the first inorganic layer away from the base substrate to form a temperature-sensing control structure.

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