Display panel and manufacturing method thereof, and mobile terminal

Abstract

The embodiments of the present application disclose a display panel, a manufacturing method thereof, and a mobile terminal. The display panel includes: a light-emitting substrate and a color conversion layer. The light-emitting substrate includes a substrate and a plurality of light sources arranged on the substrate; the color conversion layer is arranged on the light-emitting surface side of the light-emitting substrate, the color conversion layer includes a quantum dot layer, and a protective layer arranged on both sides of the quantum dot layer; wherein the quantum dot layer includes a first conversion part and a second conversion part, the second conversion part is arranged on the end face of the first conversion part and surrounds the first conversion part, and in the direction perpendicular to the light-emitting substrate, the thickness of the second conversion part is greater than the thickness of the first conversion part; the embodiments of the present application solve the technical problems of failure of the color conversion layer at the edge of the display panel due to the exposure of quantum dots on the peripheral side of the color conversion layer and easy erosion by water and oxygen, and leakage of blue light at the edge of the display panel, thereby effectively improving the display effect of the Mini LED display panel.

Description

Technical Field

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

[0002] At present, quantum dot color conversion films usually adopt a three-layer structure design, in which the middle layer is a mixed layer of quantum dot particles and optical glue, and protective layers are arranged on both sides of the middle layer.

[0003] During the production process of the color conversion film, the entire quantum dot color conversion film will be cut into small pieces. When the quantum dot color conversion film is cut into small pieces, since there is no protective layer on the side walls of the film layer, under the action of water and oxygen, a failure area will appear at the edge of the cut quantum dot color conversion film; the blue light emitted by the Mini LED light board cannot be converted into white light when passing through the failure area, which will cause blue light leakage at the edge of the Mini LED panel, affecting the display effect of the Mini LED display panel. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a method for manufacturing the same, as well as a mobile terminal, which can solve the technical problem of blue light leakage at the edge of the display panel due to the failure of quantum dots on the periphery of the color conversion layer due to corrosion by water and oxygen, and can effectively improve the display effect of the Mini LED display panel.

[0005] An embodiment of the present application provides a display panel, including:

[0006] A light-emitting substrate, comprising a substrate and a plurality of light sources disposed on the substrate;

[0007] A color conversion layer is arranged on the light emitting surface side of the light emitting substrate, and the color conversion layer includes a quantum dot layer and a protective layer arranged on both sides of the quantum dot layer;

[0008] Wherein, the quantum dot layer includes a first conversion part and a second conversion part, the second conversion part is arranged on the end face of the first conversion part and surrounds the first conversion part, and in the direction perpendicular to the light-emitting substrate, the thickness of the second conversion part is greater than the thickness of the first conversion part.

[0009] Optionally, in a direction perpendicular to the light-emitting substrate, the thickness of the first conversion portion is a first thickness, and the second conversion portion includes a second conversion portion and a first conversion portion located on the side of the second conversion portion away from the center of the color conversion layer, wherein the volume of the second conversion portion is greater than or equal to the volume of the second conversion portion at the first thickness.

[0010] Optionally, the thickness of the second conversion portion is a second thickness, and a ratio of the second thickness to the first thickness is 1.3-2.

[0011] Optionally, a distance between a side surface of the second conversion portion close to the center of the color conversion layer and another side surface of the second conversion portion away from the center of the color conversion layer is greater than 1.5 mm.

[0012] Optionally, the second conversion portion includes a first sub-portion and a second sub-portion, wherein the distance between the first sub-portion and the center of the color conversion layer is greater than the distance between the second sub-portion and the center of the color conversion layer, and in a direction perpendicular to the light-emitting substrate, the thickness of the first sub-portion is greater than or equal to the thickness of the second sub-portion.

[0013] Optionally, in a direction from an edge of the color conversion layer to a center of the color conversion layer, a thickness of the second conversion portion in a direction perpendicular to the light-emitting substrate gradually decreases.

[0014] Optionally, the protective layer includes a first protective layer and a second protective layer, the first conversion portion and the second conversion portion are flush with one side of the first protective layer, and the second conversion portion protrudes toward one side of the second protective layer.

[0015] Optionally, the second conversion portion further includes a third sub-portion, which is located on a side of the first sub-portion away from the center of the color conversion layer, and has a thickness that is smaller than that of the first sub-portion in a direction perpendicular to the light-emitting substrate.

[0016] Optionally, in a direction from the edge of the color conversion layer to the center of the color conversion layer, a thickness of the second conversion portion in a direction perpendicular to the light-emitting substrate first gradually increases and then gradually decreases.

[0017] The present application also provides a method for manufacturing a display panel, comprising the following steps:

[0018] Providing a light-emitting substrate, comprising a substrate and a plurality of light sources disposed on the substrate;

[0019] The color conversion layer is formed on the light emitting surface side of the light emitting substrate, and the color conversion layer includes a stacked quantum dot layer and two protective layers, and the quantum dot layer is arranged between the two protective layers; wherein the quantum dot layer includes a first conversion part and a second conversion part, and the second conversion part is arranged on the end face of the first conversion part and surrounds the first conversion part, and in the direction perpendicular to the light emitting substrate, the thickness of the second conversion part is greater than the thickness of the first conversion part.

[0020] Optionally, forming the color conversion layer comprises the following steps:

[0021] A color conversion layer motherboard is provided, the color conversion layer motherboard comprises a main body and a cutting portion, the thickness of the quantum dot layer corresponding to the cutting portion is greater than the thickness of the quantum dot layer corresponding to the main body, the cutting portion comprises a plurality of first strip portions extending along a first direction and arranged parallel to each other, and a plurality of second strip portions extending along a second direction and arranged parallel to each other, and the first direction and the second direction form a preset angle;

[0022] Cutting is performed along the cutting portion on the color conversion layer motherboard.

[0023] The present application also provides a mobile terminal, comprising the display panel and a terminal body as described in any one of the above embodiments, wherein the terminal body and the display panel are combined into one.

[0024] The beneficial effects of the present invention include at least:

[0025] The present application arranges the display panel to include a light-emitting substrate and a color conversion layer arranged on the light-emitting side of the light-emitting substrate, the color conversion layer includes a quantum dot layer and a protective layer, the quantum dot layer includes a first conversion part and a second conversion part, the second conversion part is arranged on the end face of the first conversion part and surrounds the first conversion part, in a direction perpendicular to the light-emitting substrate, the thickness of the second conversion part is greater than the thickness of the first conversion part, so that the number of quantum dots in the second conversion part near the edge per unit area is greater than the number of quantum dots in the first conversion part per unit area, thereby avoiding the problem of quantum dot failure at the edge of the color conversion layer due to water and oxygen erosion and blue light leakage at the edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0027] Figure 1 is a schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the structure of a quantum dot film layer provided in an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the structure of another quantum dot film layer provided in an embodiment of the present application;

[0030] Figure 4 is a schematic diagram of the structure of another quantum dot film layer provided in an embodiment of the present application;

[0031] Figure 5 is a schematic diagram of the structure of another quantum dot film layer provided in an embodiment of the present application;

[0032] Figure 6 is a schematic diagram of the structure of another quantum dot film layer provided in an embodiment of the present application;

[0033] Figure 7 It is a three-dimensional image of a quantum dot layer provided in an embodiment of the present application;

[0034] Figure 8 This is a schematic diagram of the quantum dot layer structure of a color conversion layer motherboard provided in an embodiment of the present application;

[0035] Fig. 9 This is a side view of a quantum dot layer of a color conversion layer motherboard provided in an embodiment of the present application;

[0036] Fig.10 It is a structural schematic diagram of a color conversion layer in the prior art;

[0037] Fig.11 is a manufacturing flow chart of a display panel provided in an embodiment of the present application;

[0038] Fig.12 This is a production flow chart of a color conversion layer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0040] The embodiments of the present application provide a display panel, a method for manufacturing a display panel, and a mobile terminal. The following is a detailed description. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments. In addition, in the description of the present application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels, and no numerical requirements or order is imposed. Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and simplicity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which are applicable regardless of the range. In addition, whenever a numerical range is indicated in this article, it is meant to include any quoted numbers (fractions or integers) within the indicated range.

[0041] The present application embodiment provides a display panel, such as Figure 1-9 As shown, including:

[0042] The light-emitting substrate 10 comprises a substrate 101 and a plurality of light sources 102 disposed on the substrate 101;

[0043] A color conversion layer 20 is disposed on the light emitting surface of the light emitting substrate 10 , and the color conversion layer 20 includes a quantum dot layer 201 and a protective layer 202 disposed on both sides of the quantum dot layer 201 ;

[0044] Among them, the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012, the second conversion part 2012 is arranged on the end face of the first conversion part 2011 and surrounds the first conversion part 2011, and in the direction perpendicular to the light-emitting substrate 10, the thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011.

[0045] It should be noted that the display panel in the present application includes a mini-LED display panel.

[0046] Specifically, Figure 1 As shown, the light-emitting substrate 10 includes a substrate 101 and a plurality of light sources 102 arranged on the substrate 101. The plurality of light sources 102 are arranged at intervals. The light sources 102 can specifically be blue light-emitting devices, for example, OLED light-emitting devices or mini-LED light-emitting devices. The light sources 102 emit blue light L1, and the blue light L1 undergoes color conversion through the color conversion layer 20 and is converted into white light L2 for emission.

[0047] Specifically, the color conversion layer 20 includes a quantum dot layer 201 and a protective layer 202 disposed on both sides of the quantum dot layer 201 facing and away from the light-emitting substrate 10 to protect the quantum dot layer 201 from being corroded by water and oxygen and to increase the service life of the quantum dots in the quantum dot layer 201.

[0048] Specifically, the material of the protective layer 202 may be silicon oxide, specifically silicon dioxide; the material of the protective layer 202 may also be a composite film layer of silicon oxide and high molecular polymer.

[0049] Specifically, the materials of the quantum dot layer 201 include quantum dots and glue. The quantum dots are evenly distributed in the glue. The quantum dots are nanoparticles with a size between 1 and 20 nanometers, including mixed red light quantum dots and green light quantum dots. Under the irradiation of blue light L1, red light and green light are emitted, so that the blue light L1 undergoes color conversion after passing through the color conversion layer 20 and is converted into white light L2 for emission. The glue includes but is not limited to UV glue.

[0050] It should be noted that the color conversion layer 20 is usually obtained by cutting the color conversion layer 20 motherboard according to the size requirements required for product production. Figure 8 As shown, the quantum dot layer 201 of the color conversion layer 20 obtained after cutting is as shown in FIG. Figure 7 shown.

[0051] It should be noted that, on the cross-section of the color conversion layer 20 obtained after cutting, the exposed side of the quantum dot layer 201 is easily corroded by water and oxygen, and the corrosion direction of water and oxygen gradually approaches the center of the display panel from the side edge. The edge portion of the quantum dot layer 201 of the color conversion layer 20 is corroded by water and oxygen, causing it to lose its color conversion ability and be unable to convert the blue light L1 emitted by the blue light source 102 into white light L2, resulting in the problem of blue light L1 leakage at the edge of the display panel.

[0052] Specifically, the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012. In actual production, the second conversion part 2012 and the first conversion part 2011 are an integrated structure with no gap therebetween.

[0053] Specifically, “the second conversion portion 2012 is disposed on the end surface of the first conversion portion 2011 and surrounds the first conversion portion 2011 ” means that the projection of the second conversion portion 2012 in a direction perpendicular to the first conversion portion 2011 surrounds the first conversion portion 2011 .

[0054] It should be noted that the second conversion portion 2012 has a corresponding depth L, and the depth L refers to the vertical distance between a side surface of the second conversion portion 2012 close to the center of the color conversion layer 20 and a side surface of the second conversion portion 2012 far from the center of the color conversion layer 20. Figure 4 shown.

[0055] In the prior art, Fig.10 As shown, the color conversion layer 20 has a failure depth D, which is obtained through actual measurement. The failure depth D is correlated with the thickness of the color conversion layer 20. Under the commonly used thickness of the display panel, the thickness of the quantum dot layer 201 is 0.3 mm, and the failure depth D is about 1.5 mm.

[0056] Specifically, “in a direction perpendicular to the light-emitting substrate 10, the thickness of the second conversion portion 2012 is greater than the thickness of the first conversion portion 2011” can be understood as:

[0057] The thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011 at all locations, or

[0058] The thickness of at least part of the second conversion portion 2012 is greater than the thickness of the first conversion portion 2011, and at a unit length (for example: 1 mm), the volume corresponding to the depth L of the second conversion portion 2012 is greater than the volume of the thickness of the first conversion portion 2011 corresponding to the depth L of the second conversion portion 2012.

[0059] Specifically, the thickness of the second conversion unit 2012 is set to be greater than the thickness of the second conversion unit 2012, so that the volume of the quantum dots near the edge of the quantum dot layer 201 is larger. Even if some quantum dots at the edge fail, there are still some quantum dots in the second conversion unit 2012 that can perform light conversion, so as to realize the conversion of blue light L1 at the edge into white light L2, so as to alleviate the problem of blue light L1 leakage around the display panel in the prior art and improve the white light conversion rate of the display panel architecture.

[0060] It should be noted that see Fig.10 and Figure 4 , Fig.10 Schematic diagram of the structure of the color conversion layer 20 in the prior art, wherein the thickness of the quantum dot layer 201 is equal at all locations. Figure 4 Schematic diagram of the structure of the color conversion layer 20 of the embodiment of the present application, wherein the quantum dot layer 201 includes a first conversion portion 2011 and a second conversion portion 2012. By comparison, it can be seen that the exposed area of ​​the side of the quantum dot layer 201 is smaller in the embodiment shown in FIG. 4 than in the prior art ( Fig.10) is larger. According to theory, the greater the amount of quantum dots in the quantum dot layer 201 corresponding to this embodiment that are corroded by water and oxygen, the more failed quantum dots will be. In fact, the amount of quantum dots in the second conversion section 2012 in this embodiment is able to offset the failed part due to water and oxygen corrosion relative to the amount of quantum dots in the corresponding position in the prior art, and at the same time, it also has more quantum dots that can achieve normal conversion. Therefore, the technical solution of this embodiment can effectively enhance the white light conversion rate of the color conversion layer 20.

[0061] It can be understood that, by setting the display panel to include a light-emitting substrate 10 and a color conversion layer 20 arranged on the light-emitting side of the light-emitting substrate 10, the color conversion layer 20 includes two protective layers 202 and a quantum dot layer 201 arranged between the two protective layers 202, the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012, the second conversion part 2012 is arranged on the end face of the first conversion part 2011 and surrounds the first conversion part 2011, and in the direction perpendicular to the light-emitting substrate 10, the thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011, so that within a unit area, the number of quantum dots of the second conversion part 2012 near the edge is greater than the number of quantum dots of the first conversion part 2011 within a unit area, thereby avoiding the failure of quantum dots at the edge of the color conversion layer 20 due to water and oxygen erosion, and alleviating the problem of blue light L1 leakage at the edge of the display panel.

[0062] In one embodiment, if Figure 4 As shown, in the direction perpendicular to the light-emitting substrate 10, the thickness of the first conversion portion 2011 is a first thickness H1, and the second conversion portion 2012 includes a second conversion portion 2012A2 and a first conversion portion 2012A1 located on the side of the second conversion portion 2012A2 away from the center of the color conversion layer 20, wherein the volume of the second conversion portion 2012A2 is greater than or equal to the volume of the second conversion portion 2012 at the first thickness H1.

[0063] It should be noted that after the product is produced and not corroded by water and oxygen, the quantum dots in the converter part 2012A2 and the converter part 1 2012A1 can perform white light conversion normally.

[0064] It should be noted that the converter part 2012A1 is located on the outside of the second conversion part 2012 (i.e., away from the center of the color conversion layer 20). After being used for a period of time, some quantum dots in the converter part 2012A1 cannot perform color conversion, and the overall white light conversion rate is low, which does not meet actual production needs.

[0065] It should be noted that the converter part 2012A2 is located on the inner side of the second converter part 2012 (i.e., close to the center of the color conversion layer 20). After a period of use, some quantum dots in the converter part 2012A2 cannot perform color conversion, but the overall white light conversion rate meets production requirements.

[0066] Specifically, “the volume of the second conversion part 2012A2 is greater than or equal to the volume of the second conversion part 2012 corresponding to the first thickness H1” means that, in one embodiment, Figure 4 As shown, the volume of the second conversion sub-section 2012A2 in the second conversion section 2012 that can effectively perform white light conversion is greater than or equal to the volume of the first thickness H1 at the depth L of the second conversion section 2012, so that in the direction perpendicular to the light-emitting substrate 10 (i.e., on the light-emitting surface), the white light conversion rate of the second conversion section 2012 is at least the same as the white light conversion rate of the portion of the first conversion section 2011 that has the same area as the orthographic projection area of ​​the second conversion section 2012.

[0067] It can be understood that by adopting this technical solution, the white light conversion rate of the second conversion part 2012 can be the same as or higher than the white light conversion rate of the first conversion part 2011, which completely solves the problem of blue light L1 leakage around the display panel.

[0068] In one embodiment, the thickness of the second conversion portion 2012 is a second thickness H2, and a ratio of the second thickness H2 to the first thickness H1 is 1.3-2.

[0069] Specifically, the thickness of the second conversion portion 2012 is a second thickness H2. In a specific example, Figure 4 As shown, the second conversion portion 2012 has multiple thicknesses, and the second thickness H2 is the maximum value of the multiple thicknesses in the second conversion portion 2012.

[0070] Specifically, Figure 4 As shown, the first conversion part 2011 has a first thickness H1, the maximum thickness of the second conversion part 2012 is H2, and the ratio of the second thickness H2 to the first thickness H1 can be any one of 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 2.0, which can be adjusted according to actual production conditions.

[0071] It can be understood that by further limiting the thickness of the second conversion portion 2012 , the overall thickness of the display panel can be reduced, thereby improving the user experience, while ensuring that the blue light L1 does not leak from the periphery of the display panel.

[0072] In one embodiment, a distance between a side of the second conversion portion 2012 close to the center of the color conversion layer 20 and another side of the second conversion portion 2012 far from the center of the color conversion layer 20 is greater than 1.5 mm.

[0073] Specifically, the second conversion portion 2012 has a corresponding depth L, and the depth L refers to the vertical distance between a side surface of the second conversion portion 2012 close to the center of the color conversion layer 20 and a side surface of the second conversion portion 2012 far from the center of the color conversion layer 20. Figure 4 shown.

[0074] Specifically, Fig.10 As shown, the color conversion layer 20 has a failure depth D, which is obtained through actual measurement. The failure depth D is correlated with the thickness of the color conversion layer 20. However, under the commonly used thickness of the display panel, when the thickness of the quantum dot layer 201 is 0.3 mm, the failure depth D is about 1.5 mm.

[0075] It can be understood that by setting the depth L of the second conversion portion 2012 to be greater than 1.5 mm, the display panel can have a thinner thickness while ensuring that the side edge does not leak blue light L1, thereby improving the user experience.

[0076] In one embodiment, if Figure 2 , Figure 3 As shown, the second conversion portion 2012 includes a first sub-portion 2012a and a second sub-portion 2012b, wherein the distance between the first sub-portion 2012a and the center of the color conversion layer 20 is greater than the distance between the second sub-portion 2012b and the center of the color conversion layer 20, and in the direction perpendicular to the light-emitting substrate 10, the thickness of the first sub-portion 2012a is greater than the thickness of the second sub-portion 2012b.

[0077] Specifically, in one example, Figure 2 As shown, the first sub-portion 2012a and the second sub-portion 2012b are an integrally formed structure, and in the direction F from the edge of the quantum dot layer 201 to the center of the color conversion layer 20, the thickness of each location on the first sub-portion 2012a gradually decreases, and the thickness of each location on the second sub-portion 2012b gradually decreases.

[0078] Specifically, the two side surfaces of the second sub-portion 2012b close to or away from the light-emitting substrate 10 may be curved surfaces (eg Figure 4 The upper surface in the figure) can be an inclined surface (such as Figure 2 ), or it can be a stepped bending surface (such as Figure 3 ), the specific shape is not limited.

[0079] Specifically, in one example, Figure 3 As shown, the first sub-section 2012a and the second sub-section 2012b are integrally formed structures, the thickness of each part on the first sub-section 2012a is equal, the thickness of each part on the second sub-section 2012b is equal, and the thickness of the first sub-section 2012a is greater than the thickness of the second sub-section 2012b.

[0080] It can be understood that in the direction F from the edge of the quantum dot layer 201 to the center of the color conversion layer 20, the thickness of the second conversion layer tends to decrease as a whole, so that the chromaticity of the display panel transitions evenly from the edge to the center, effectively improving the display effect of the display panel.

[0081] In one embodiment, if Figure 2 and Figure 4 As shown, in the direction F from the edge of the color conversion layer 20 to the center of the color conversion layer 20 , the thickness of the second conversion portion 2012 in the direction perpendicular to the light emitting substrate 10 gradually decreases.

[0082] Specifically, the two side surfaces of the second sub-portion 2012b close to or away from the light-emitting substrate 10 may be curved surfaces (eg Figure 4 The upper surface in the figure) can be an inclined surface (such as Figure 2 ).

[0083] It can be understood that in the direction F from the edge of the quantum dot layer 201 to the center of the color conversion layer 20, the thickness of the second conversion layer gradually decreases, so that the chromaticity of the display panel transitions evenly from the edge to the center, effectively improving the display effect of the display panel.

[0084] In one embodiment, the protective layer 202 includes a first protective layer 202a and a second protective layer 202b, the first conversion portion 2011 and the second conversion portion 2012 are flush with one side of the first protective layer 202a, and the second conversion portion 2012 protrudes toward one side of the second protective layer 202b.

[0085] Specifically, Figure 1 and Figure 4 As shown, the first conversion portion 2011 and the second conversion portion 2012 are arranged in the same plane toward a side surface of the light-emitting substrate 10 , and the second conversion portion 2012 is protruded relative to the first conversion portion 2011 on the light-emitting surface of the display panel.

[0086] Specifically, the specific shape of the protrusion is not limited, and its cross-section can be fan-shaped, stepped or wedge-shaped.

[0087] Specifically, the color conversion layer 20 is cut from a color conversion layer 20 motherboard, and by setting the first conversion portion 2011 and the second conversion portion 2012 flush with one side of the first protective layer 202a, the etching step for forming an additional concave structure after forming the first conversion portion 2011 can be avoided.

[0088] It can be understood that the first conversion part 2011 and the second conversion part 2012 are flush with one side of the first protective layer 202a, and the second conversion part 2012 is protruding toward one side of the second protective layer 202b, which can solve the problem of blue light leakage L1 at the edge of the display panel while reducing the production cost of the color conversion layer 20.

[0089] In one embodiment, if Figure 5 As shown, the second conversion portion 2012 also includes a third sub-portion 2012c, which is located on a side of the first sub-portion 2012a away from the center of the color conversion layer 20, and in a direction perpendicular to the light-emitting substrate 10, the thickness of the third sub-portion 2012c is less than the thickness of the first sub-portion 2012a.

[0090] Specifically, in the prior art, the blue light L1 leaks from the peripheral side of the display panel because the peripheral side of the quantum dot layer 201 is exposed, causing the quantum dots to be corroded by water and oxygen and become ineffective. Therefore, by setting the second conversion part 2012 to include a first sub-part 2012a, a second sub-part 2012b and a third sub-part 2012c, the thickness of the third sub-part 2012c is less than the thickness of the first sub-part 2012a, so that the exposed amount of the end face quantum dots is smaller than that of the above-mentioned embodiment, further reducing the number of failed quantum dots, thereby reducing the overall quantum dot usage of the second conversion part 2012 and reducing production costs.

[0091] Specifically, the thickness of each part of the third sub-section 2012c may be equal (eg Figure 5 ), or they may be different (such as Figure 6 shown).

[0092] It can be understood that by setting the third sub-section 2012c and setting the thickness of the third sub-section 2012c to be smaller than the thickness of the first sub-section 2012a, the exposed area of ​​the end face of the second conversion section 2012 can be reduced, the amount of quantum dot failure can be reduced, and the amount of quantum dots used in the second conversion section 2012 can be reduced to a certain extent, which can effectively reduce the production cost of the color conversion film layer of the embodiment of the present application.

[0093] In one embodiment, if Figure 6As shown, in the direction F from the edge of the color conversion layer 20 to the center of the color conversion layer 20 , the thickness of the second conversion portion 2012 in the direction perpendicular to the light-emitting substrate 10 first gradually increases and then gradually decreases.

[0094] Specifically, the side surfaces of the third sub-portion 2012c, the first sub-portion 2012a and the second sub-portion 2012b facing toward or away from the light-emitting substrate 10 are smooth arc surfaces.

[0095] It can be understood that by setting the third sub-section 2012c, the exposed area of ​​the end face of the second conversion section 2012 is reduced, the amount of quantum dot failure is effectively reduced, and the usage of the quantum dots of the second conversion section 2012 is reduced to a certain extent, which can effectively reduce the production cost of the color conversion film layer of the embodiment of the present application. At the same time, by setting the third sub-section 2012c, the first sub-section 2012a and the second sub-section 2012b to face or away from the side of the light-emitting substrate 10 as a smooth arc surface, on the one hand, the production steps can be simplified, and on the other hand, the chromaticity transition from the edge to the center of the display panel can be made more uniform, thereby improving the display effect of the display panel.

[0096] The present application also provides a method for manufacturing a display panel, such as Fig.11 As shown, the following steps are included:

[0097] S1, providing a light-emitting substrate 10, comprising a substrate 101 and a plurality of light sources 102 disposed on the substrate 101;

[0098] S2. The color conversion layer 20 is formed on the light emitting surface side of the light emitting substrate 10, and the color conversion layer 20 includes a stacked quantum dot layer 201 and two protective layers 202, and the quantum dot layer 201 is arranged between the two protective layers 202; wherein the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012, and the second conversion part 2012 is arranged on the end face of the first conversion part 2011 and surrounds the first conversion part 2011, and in the direction perpendicular to the light emitting substrate 10, the thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011.

[0099] Specifically, the materials and structures of the light-emitting substrate 10 , the protective layer 202 , and the quantum dot layer 201 can be found in the above embodiments, and will not be described in detail here.

[0100] It can be understood that the display panel includes a light-emitting substrate 10 and a color conversion layer 20 arranged on the light-emitting side of the light-emitting substrate 10, the color conversion layer 20 includes a quantum dot layer 201 and a protective layer 202, the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012, the second conversion part 2012 is arranged on the end face of the first conversion part 2011 and surrounds the first conversion part 2011, and in the direction perpendicular to the light-emitting substrate 10, the thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011, so that within a unit area, the number of quantum dots of the second conversion part 2012 near the edge is greater than the number of quantum dots of the first conversion part 2011 within a unit area, thereby avoiding the problem of quantum dot failure due to water and oxygen erosion at the edge of the color conversion layer 20 and the leakage of blue light L1 at the edge.

[0101] In one embodiment, if Figure 8 and Fig.12 As shown, forming the color conversion layer 20 includes the following steps:

[0102] S21, providing a color conversion layer 20 motherboard, wherein the quantum dot layer 201 of the color conversion layer 20 motherboard comprises a main body portion 2011m and a cutting portion 2012s, wherein the thickness of the quantum dot layer 201 corresponding to the cutting portion 2012s is greater than the thickness of the quantum dot layer 201 corresponding to the main body portion 2011m, and the cutting portion 2012s comprises a plurality of first strip portions extending along a first direction F1 and arranged in parallel with each other, and a plurality of second strip portions extending along a second direction F2 and arranged in parallel with each other, wherein the first direction F1 and the second direction F2 form a preset angle;

[0103] Specifically, the preset angle is 90°.

[0104] S22, cutting along the cutting portion 2012s on the color conversion layer 20 motherboard.

[0105] Specifically, the quantum dot layer 201 in the color conversion layer 20 motherboard is formed by layered coating, firstly coating a layer of quantum dot glue liquid with uniform thickness, and after the quantum dot glue liquid is cured, coating is performed for the second time on the corresponding cutting line to form a plurality of first strip portions and a plurality of second strip portions;

[0106] When cutting, Figure 8 and Fig. 9 As shown, the color conversion film layer of the embodiment of the present application is obtained by cutting along the first direction F1 and the second direction F2 at the center positions of the first strip-shaped portion and the second strip-shaped portion.

[0107] The present application also provides a mobile terminal, comprising the display panel according to any one of the above claims and a terminal body, wherein the terminal body and the display panel are combined into one body.

[0108] Specifically, mobile terminals include but are not limited to the following types: mobile phones, watches, bracelets, televisions or other wearable display or touch electronic devices, as well as flexible smartphones, tablet computers, laptops, desktop displays, televisions, smart glasses, smart watches, ATM machines, digital cameras, car displays, medical displays, industrial control displays, e-readers, electrophoretic display devices, game consoles, transparent displays, double-sided displays, naked-eye 3D displays, mirror display devices, semi-reflective and semi-transparent display devices, etc.

[0109] In summary, the present application arranges the display panel to include a light-emitting substrate 10 and a color conversion layer 20 arranged on the light-emitting side of the light-emitting substrate 10, the color conversion layer 20 includes a quantum dot layer 201 and a protective layer 202, the quantum dot layer 201 includes a first conversion part 2011 and a second conversion part 2012, the second conversion part 2012 is arranged on the end face of the first conversion part 2011 and surrounds the first conversion part 2011, and in a direction perpendicular to the light-emitting substrate 10, the thickness of the second conversion part 2012 is greater than the thickness of the first conversion part 2011, so that within a unit area, the number of quantum dots of the second conversion part 2012 near the edge is greater than the number of quantum dots of the first conversion part 2011 within a unit area, thereby avoiding the problem of quantum dot failure due to water and oxygen erosion at the edge of the color conversion layer 20 and leakage of blue light L1 at the edge.

[0110] The above is a detailed introduction to a display panel, a method for manufacturing a display panel and a mobile terminal provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display panel, characterized in that: include: A light-emitting substrate, comprising a substrate and a plurality of light sources disposed on the substrate; A color conversion layer is arranged on the light emitting surface side of the light emitting substrate, and the color conversion layer includes a quantum dot layer and a protective layer arranged on both sides of the quantum dot layer; The quantum dot layer includes a first conversion portion and a second conversion portion, the second conversion portion is arranged on the end surface of the first conversion portion and surrounds the first conversion portion, and in a direction perpendicular to the light-emitting substrate, the thickness of the second conversion portion is greater than the thickness of the first conversion portion; Wherein, in a direction perpendicular to the light-emitting substrate, the thickness of the first conversion portion is a first thickness, the thickness of the second conversion portion is a second thickness, and the depth of the second conversion portion is a vertical distance between a side surface of the second conversion portion close to the center of the color conversion layer and a side surface of the second conversion portion far from the center of the color conversion layer; Among them, the second conversion part includes two conversion sub-parts, and one conversion sub-part located on the side of the second conversion sub-part away from the center of the color conversion layer, and the volume of the second conversion sub-part that can effectively perform white light conversion in the second conversion part is greater than or equal to the volume corresponding to the first thickness at the depth of the second conversion part, so that in the direction perpendicular to the light-emitting substrate, the white light conversion rate of the second conversion part is at least the same as the white light conversion rate of a part of the first conversion part that has an equal area as the orthographic projection area of ​​the second conversion part.

2. The display panel according to claim 1, wherein: The ratio of the second thickness to the first thickness is 1.3-2.

3. The display panel according to claim 1, wherein: A distance between a side surface of the second conversion portion close to the center of the color conversion layer and another side surface of the second conversion portion far from the center of the color conversion layer is greater than 1.5 mm.

4. The display panel according to claim 1, wherein: In a direction from an edge of the color conversion layer to a center of the color conversion layer, a thickness of the second conversion portion in a direction perpendicular to the light emitting substrate gradually decreases.

5. A display panel, characterized in that: include: A light-emitting substrate, comprising a substrate and a plurality of light sources disposed on the substrate; A color conversion layer is arranged on the light emitting surface side of the light emitting substrate, and the color conversion layer includes a quantum dot layer and a protective layer arranged on both sides of the quantum dot layer; The quantum dot layer includes a first conversion portion and a second conversion portion, the second conversion portion is arranged on the end surface of the first conversion portion and surrounds the first conversion portion, and in a direction perpendicular to the light-emitting substrate, the thickness of the second conversion portion is greater than the thickness of the first conversion portion; The second conversion portion includes a first sub-portion and a second sub-portion, wherein the distance between the first sub-portion and the center of the color conversion layer is greater than the distance between the second sub-portion and the center of the color conversion layer, and in a direction perpendicular to the light-emitting substrate, the thickness of the first sub-portion is greater than the thickness of the second sub-portion; The second conversion portion further includes a third sub-portion, the third sub-portion is located on a side of the first sub-portion away from the center of the color conversion layer, and the thickness of the third sub-portion is less than the thickness of the first sub-portion in a direction perpendicular to the light-emitting substrate; The number of quantum dots per unit area of ​​the second conversion portion near the edge is greater than the number of quantum dots per unit area of ​​the first conversion portion.

6. The display panel according to claim 5, wherein: The protective layer includes a first protective layer and a second protective layer, the first conversion portion and the second conversion portion are flush with one side surface close to the first protective layer, and the second conversion portion protrudes toward one side surface of the second protective layer.

7. The display panel according to claim 5, wherein: In a direction from the edge of the color conversion layer to the center of the color conversion layer, the thickness of the second conversion portion in a direction perpendicular to the light-emitting substrate first gradually increases and then gradually decreases.

8. A method for manufacturing a display panel, characterized in that: The following steps are involved: Providing a light-emitting substrate, comprising a substrate and a plurality of light sources disposed on the substrate; A color conversion layer is formed on one side of the light emitting surface of the light emitting substrate, the color conversion layer includes a quantum dot layer and two protective layers, the quantum dot layer is arranged between the two protective layers; wherein the quantum dot layer includes a first conversion portion and a second conversion portion, the second conversion portion is arranged on the end surface of the first conversion portion and surrounds the first conversion portion, and in a direction perpendicular to the light emitting substrate, the thickness of the second conversion portion is greater than the thickness of the first conversion portion; Wherein, in a direction perpendicular to the light-emitting substrate, the thickness of the first conversion portion is a first thickness, the thickness of the second conversion portion is a second thickness, and the depth of the second conversion portion is a vertical distance between a side surface of the second conversion portion close to the center of the color conversion layer and a side surface of the second conversion portion far from the center of the color conversion layer; Among them, the second conversion part includes two conversion sub-parts, and one conversion sub-part located on the side of the second conversion sub-part away from the center of the color conversion layer, and the volume of the second conversion sub-part that can effectively perform white light conversion in the second conversion part is greater than or equal to the volume corresponding to the first thickness at the depth of the second conversion part, so that in the direction perpendicular to the light-emitting substrate, the white light conversion rate of the second conversion part is at least the same as the white light conversion rate of a part of the first conversion part that has an equal area as the orthographic projection area of ​​the second conversion part.

9. The method for manufacturing a display panel according to claim 8, wherein: Forming the color conversion layer comprises the following steps: A color conversion layer motherboard is provided, the color conversion layer motherboard comprises a main body and a cutting portion, the thickness of the quantum dot layer corresponding to the cutting portion is greater than the thickness of the quantum dot layer corresponding to the main body, the cutting portion comprises a plurality of first strip portions extending along a first direction and arranged parallel to each other, and a plurality of second strip portions extending along a second direction and arranged parallel to each other, and the first direction and the second direction form a preset angle; Cutting is performed along the cutting portion on the color conversion layer motherboard.

10. A mobile terminal, characterized in that: It comprises the display panel and the terminal body as claimed in any one of claims 1 to 7, wherein the terminal body and the display panel are integrated into one.

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