Display substrate and preparation method therefor, and display panel

Abstract

The present application relates to the technical field of display. Provided are a display substrate and a preparation method therefor, and a display panel. The display substrate comprises: a first base, a plurality of reflective structures located on the first base and arranged in array, a plurality of color conversion patterns, and a light-absorption structure, wherein a first groove is provided in each reflective structure, and a second groove is provided between every two adjacent reflective structures; the color conversion patterns are arranged in the first grooves; and a first portion of the light-absorption structure is arranged in the second grooves, and a second portion of the light-absorption structure is arranged on the side of the reflective structures that is away from the first base. The structure takes both the light-emission brightness of the display substrate and a light-crosstalk problem thereof into account, and improves the light-emission brightness and ameliorates the light-crosstalk problem, thereby improving the display effect of a display apparatus prepared from the display substrate.

Description

Display substrate and manufacturing method thereof, display panel Technical Field

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

[0002] With the rapid development of various display technologies, customers are increasingly demanding higher color performance from display products. Quantum dot display products typically use a blue backlight to excite the quantum dot (QD) color conversion pattern. In practical applications, crosstalk is very likely to occur between the areas of the quantum dot (QD) color conversion pattern.

[0003] In the related art, a light-absorbing structure is usually provided to absorb the crosstalk light. However, this greatly reduces the brightness of the display product and increases power consumption.

[0004] Summary of the Invention

[0005] The embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a display substrate, comprising:

[0007] first base;

[0008] a plurality of reflective structures arranged in an array on the first substrate, wherein a first groove is provided in each of the reflective structures, and a second groove is provided between two adjacent reflective structures;

[0009] a plurality of color conversion patterns, the color conversion patterns being disposed in the first groove;

[0010] A light absorbing structure, wherein a first portion of the light absorbing structure is disposed in the second groove, and a second portion of the light absorbing structure is disposed on a side of the light reflecting structure away from the first substrate.

[0011] In at least one display substrate provided by an embodiment of the present application, the orthographic projection of the light absorption structure on the first substrate covers the orthographic projection of the light reflective structure on the first substrate.

[0012] In at least one display substrate provided in an embodiment of the present application, the display substrate further includes a first encapsulation layer, which covers the color conversion pattern, the reflective structure and the bottom of the second groove, and a partial area of ​​the first encapsulation layer is arranged between the reflective structure and the light absorption structure.

[0013] In at least one display substrate provided by an embodiment of the present application, the refractive index of the material of the reflective structure is greater than the refractive index of the material of the first encapsulation layer.

[0014] In at least one display substrate provided in an embodiment of the present application, the thickness of the light absorption structure in a direction perpendicular to the plane of the first substrate is greater than the thickness of the light reflective structure in a direction perpendicular to the plane of the first substrate.

[0015] In at least one display substrate provided in an embodiment of the present application, the display substrate further includes a plurality of filter patterns, the filter patterns are located on a side of the color conversion pattern away from the first substrate, and the light absorption structure is further located between two adjacent filter patterns.

[0016] In at least one display substrate provided in an embodiment of the present application, a ratio between a maximum planar dimension of the reflective structure and a thickness of the reflective structure in a direction perpendicular to a plane of the first substrate is in a range of 0.8 to 1.5.

[0017] In at least one display substrate provided in an embodiment of the present application, the cross-sectional figure of the reflective structure along a direction perpendicular to the plane where the first substrate is located includes a first trapezoid, the upper base of the first trapezoid is arranged away from the first substrate, and the lower base of the first trapezoid is in contact with the first substrate; the length ratio between the lower base of the first trapezoid and the upper base of the first trapezoid is in a range of 1 to 1.2.

[0018] In at least one display substrate provided in an embodiment of the present application, a cross-sectional shape of the reflective structure along a direction perpendicular to the plane of the first substrate includes a shape formed by splicing a second trapezoid and a third trapezoid, wherein the upper base of the second trapezoid and the upper base of the third trapezoid are equal in size and are spliced ​​together, the lower base of the second trapezoid contacts the first substrate, and the lower base of the third trapezoid contacts the first encapsulation layer;

[0019] The length ratio between the upper base of the second trapezoid and the lower base of the second trapezoid, and the length ratio between the upper base of the third trapezoid and the lower base of the third trapezoid are both in the range of 0.8 to 0.99.

[0020] In at least one display substrate provided in an embodiment of the present application, a ratio between a height of the second trapezoid and a thickness of the reflective structure in a direction perpendicular to a plane of the first substrate is in a range of 0.1 to 0.4.

[0021] In at least one display substrate provided in an embodiment of the present application, the absolute value of the difference between the thickness of the light absorption structure in a direction perpendicular to the plane of the first substrate and the thickness of the light reflective structure in a direction perpendicular to the plane of the first substrate ranges from 1 μm to 5 μm.

[0022] In at least one display substrate provided in an embodiment of the present application, the thickness of the light absorption structure in a direction perpendicular to the plane where the first base is located ranges from 12 μm to 20 μm.

[0023] In at least one display substrate provided in an embodiment of the present application, at least part of the reflective structures are connected as one body.

[0024] In at least one display substrate provided in an embodiment of the present application, a plurality of connecting portions are provided in at least a portion of the display substrate, and the orthographic projections of the connecting portions on the first substrate do not overlap with the orthographic projections of the color conversion pattern on the first substrate.

[0025] Any two adjacent reflective structures are respectively connected to the connecting portion as a whole; the connecting portion and the reflective structures are made of the same material.

[0026] In at least one display substrate provided by an embodiment of the present application, the plurality of color conversion patterns include a first conversion pattern, a second conversion pattern, and a light-transmitting pattern having different colors;

[0027] Along the extending direction of the connecting portion, at most two ends of the connecting portion are provided with the color conversion pattern of one color.

[0028] In at least one display substrate provided in an embodiment of the present application, the second grooves are arranged independently of each other.

[0029] In a second aspect, an embodiment of the present application provides a display panel, which includes the display substrate as described in the first aspect.

[0030] In a third aspect, an embodiment of the present application provides a method for preparing a display substrate, which is applied to prepare the display substrate as described in any one of the first aspects, the method comprising:

[0031] providing a first substrate;

[0032] forming a plurality of reflective structures arranged in an array on the first substrate, wherein a first groove is provided in each of the reflective structures, and a second groove is provided between two adjacent reflective structures;

[0033] forming a color conversion pattern in the first groove;

[0034] A plurality of light absorbing structures are formed, wherein a first portion of the light absorbing structure is disposed in the second groove, and a second portion of the light absorbing structure is disposed on a side of the light reflecting structure away from the first substrate.

[0035] In the method for manufacturing at least one display substrate provided in an embodiment of the present application, after the step of forming the color conversion pattern in the first groove and before the step of forming the plurality of light absorption structures, the method further includes:

[0036] A first encapsulation layer is formed; the first encapsulation layer covers the color conversion pattern, the reflective structure and the bottom of the second groove, and a partial area of ​​the first encapsulation layer is arranged between the reflective structure and the light absorbing structure.

[0037] In the method for preparing at least one display substrate provided in an embodiment of the present application, the step of forming a plurality of light absorption structures, wherein a first portion of the light absorption structure is disposed in the second groove, and a second portion of the light absorption structure is disposed on a side of the reflective structure away from the first substrate, includes:

[0038] forming a light-absorbing film; the light-absorbing film is disposed in the second groove and covers the color conversion pattern and the light-reflecting structure;

[0039] Pre-treating the light-absorbing film by a hot plate heating process so that the portion of the light-absorbing film disposed in the second groove is pre-solidified;

[0040] The light-absorbing film is patterned by using a photocuring process to obtain the light-absorbing structure.

[0041] In the method for preparing at least one display substrate provided in an embodiment of the present application, after the step of forming a plurality of light absorption structures, the method further includes:

[0042] A light filtering pattern is formed between two adjacent light absorption structures, and the light filtering pattern is located on a side of the color conversion pattern away from the first substrate.

[0043] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] FIG1 is a schematic cross-sectional view of a display substrate provided in an embodiment of the present application;

[0046] FIG2A provides a spectrum of quantum dots of different colors excited by blue light;

[0047] FIG2B provides the red, green, and blue spectra emitted by an organic light emitting diode;

[0048] FIG3 is a schematic top view of a reflective structure in a display substrate provided in an embodiment of the present application;

[0049] FIG4 is a schematic diagram of the cross-sectional structure along the M1M2 direction of FIG3 ;

[0050] FIG5 is a schematic top view of a light absorption structure in a display substrate provided in an embodiment of the present application;

[0051] 6A and 6B are schematic diagrams of two cross-sectional structures along the M3M4 direction of FIG. 5 ;

[0052] 7 and 9 are schematic cross-sectional views of two reflective structures provided in embodiments of the present application;

[0053] 8 and 10 are schematic cross-sectional views of two other display substrates provided in embodiments of the present application;

[0054] 11A, 11B, 11C, 12A, 12B, 13A, 13B and 14A are schematic diagrams of eight different arrangements of reflective structures and connecting parts provided in embodiments of the present application;

[0055] FIG12C is a top view of the integrated structure of the reflective structure F and the connecting portion LJ based on the arrangement of FIG12B.

[0056] FIG13C is a top view of an integrated structure of the reflective structure F and the connecting portion LJ based on the arrangement of the reflective structure F and the connecting portion LJ in FIG13B ;

[0057] FIG14B is a top view of an integrated structure of the reflective structure F and the connecting portion LJ based on the arrangement of the reflective structure F and the connecting portion LJ in FIG14A ;

[0058] FIG15 is a schematic diagram of ink printing deviation during the inkjet printing process in the related art;

[0059] FIG16 is a schematic diagram of ink printing positions during an inkjet printing process according to an embodiment of the present application;

[0060] Figures (1), (2) and (3) in Figure 17 are schematic diagrams of three intermediate structures of the display substrate during the preparation process provided in an embodiment of the present application. Specific embodiments

[0061] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] In the embodiments of the present application, words such as "first", "second", "third", and "fourth" are used to distinguish between identical or similar items with basically the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0063] In the embodiments of the present application, the terms "upper" and "lower" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0064] Throughout the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present application. Schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any one or more embodiments or examples in any suitable manner.

[0065] In the embodiments of the present application, “a plurality of” means two or more, and “at least one” means one or more, unless otherwise clearly defined.

[0066] The features "parallel," "perpendicular," and "identical" used in the embodiments of the present application include features such as "parallel," "perpendicular," and "identical" in the strict sense, as well as "approximately parallel," "approximately perpendicular," and "approximately identical" that include certain tolerances, taking into account the measurement and tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), and represent within an acceptable range of deviation for a particular value determined by a person of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value.

[0067] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, that is, meaning "including, but not limited to."

[0068] In the embodiments of this application, "same layer" refers to the relationship between multiple film layers formed from the same material after the same step (e.g., a one-step patterning process). "Same layer" here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same. Polygons in this specification are not strictly defined and can be approximate triangles, parallelograms, trapezoids, pentagons, or hexagons, etc., and some small deformations due to tolerances may exist.

[0069] The barrier layers (also known as retaining walls (PWs)) between pixels used in the display industry are generally made of black material (OD value > 0.2 / μm). This prevents light from each pixel from passing through the barrier layer to the adjacent pixel, effectively preventing crosstalk between pixels. Black material is characterized by low transmittance (high OD value) at all wavelengths and low reflectivity (generally less than 10%). This means that light directed toward the barrier layer (lateral light) is essentially absorbed by the barrier layer. As a result, the light that passes through the liquid crystal layer and reaches the color filter layer is not Lambertian light, resulting in a high brightness decay (L-decay) and low wide-angle (lateral) light. Therefore, the proportion of wide-angle (lateral) light absorbed by the black barrier layer is small, significantly impacting the brightness of the panel (LCD panel).

[0070] Quantum dots (QDs) have the characteristics of tunable wavelength, narrow half-width, and spectral purity. They are usually excited by blue light and converted into red / green light of corresponding wavelengths, thereby improving the display effect of the product.

[0071] QDCC technology uses quantum dots as a light conversion layer, converting backlight (OLED or micro-LED) into red and green light to achieve RGB three-color display. The light excited by quantum dots after receiving short-wavelength backlight is Lambertian light, which has low brightness decay (L-decay) and a large proportion of wide-angle (lateral) light. The absorption of wide-angle light by the black barrier layer is significant. This is especially true when the ratio of pixel width to height is small, that is, when the pixel size is small and the PPI is high, the absorption of wide-angle light by the barrier layer has a more serious impact on the overall brightness of the display substrate.

[0072] In the related art, the structure of the quantum dot display panel is shown in FIG1 , and its main structure includes a first panel SUB1, a plurality of pixel driving circuits located on the first panel SUB1 (for example, T1, T2, and T3 represent pixel driving circuits of three sub-pixels, respectively), an insulating layer INL around the circuit, a pixel definition layer PDL, and light-emitting devices LD1, LD2, and LD3, wherein a plurality of openings are provided on the pixel definition layer PDL, dividing the display panel into a light-emitting area (for example, LA1, LA2, and LA3) and a non-light-emitting area NLA, and the light-emitting area (for example, LA1, LA2, and LA3) is an area where the light-emitting device actually emits light; the light-emitting device includes an anode layer (for example, AE1, AE2, and AE3) electrically connected to the pixel driving circuit, a light-emitting layer OL electrically connected to the anode layer, and a light-emitting layer O covering the light-emitting layer NLA. L, a cathode layer CE on the cathode layer CE, a first encapsulation layer TFE covering the cathode layer CE, wherein the first encapsulation layer TFE includes three encapsulation sublayers ENL1, ENL2 and ENL3, the side of the thin film encapsulation layer TFE away from the first panel SUB1 includes quantum dot color conversion patterns CCP1 and CCP2, a transmission pattern layer TP, and a quantum dot retaining wall PW located at the periphery, the second encapsulation layer CAP1 covers the quantum dot color conversion patterns CCP1 and CCP2, the transmission pattern layer TP, and the quantum dot retaining wall PW located at the periphery, and a color filter layer is provided on the side of the second encapsulation layer CAP1 away from the first panel SUB1, wherein the color filter layer includes a first color pattern CF1, a second color pattern CF2, a third color pattern CF3 and a black matrix BM located between two adjacent color patterns.

[0073] FIG2B provides a red, green, and blue spectrum emitted by an OLED light-emitting device, and FIG2A provides a spectrum of quantum dots excited by blue light under QD-OLED technology.

[0074] Quantum dot color conversion patterns CCP1 and CCP2 are typically excited by a blue backlight source (e.g., by blue light-emitting devices LD1 and LD2, as shown in FIG1 ), emitting red and green light, respectively. Light emitted by blue light-emitting device LD3 is then transmitted through the transmissive pattern layer TP for display. However, in practical applications, crosstalk is very likely to occur between quantum dot color conversion patterns of different colors (e.g., quantum dot color conversion patterns CCP1 and CCP2, as shown in FIG1 ). Related art employs the use of quantum dot retaining walls PW and black matrices BM to absorb crosstalk. However, this significantly reduces the brightness of the display product and increases power consumption.

[0075] Based on this, an embodiment of the present application provides a display substrate, a preparation method thereof, and a display panel, wherein the display substrate includes: a first substrate, a plurality of reflective structures, a plurality of color conversion patterns, and a light-absorbing structure arranged in an array on the first substrate; wherein a first groove is provided in the reflective structure, and a second groove is provided between two adjacent reflective structures; the color conversion pattern is provided in the first groove; a first part of the light-absorbing structure is provided in the second groove, and a second part of the light-absorbing structure is provided on a side of the reflective structure away from the first substrate.

[0076] In this way, on the one hand, most of the light emitted from the side of the color conversion pattern can be reflected back to the area of ​​the light-emitting side of the display substrate close to the normal viewing angle through the reflective structure, thereby improving the light output rate of the display substrate at the normal viewing angle; on the other hand, by arranging the first part of the light-absorbing structure in the second groove and the second part of the light-absorbing structure on the side of the reflective structure away from the first substrate, a small amount of light that is not reflected by the reflective structure can be avoided from being emitted from the side of the color conversion pattern, thereby greatly reducing the light crosstalk problem in the area between two adjacent color conversion patterns; thereby taking into account and improving both the light output brightness and the light crosstalk problem of the display substrate, thereby improving the display effect of the display device prepared by the display substrate.

[0077] The display substrate and its preparation method, and the display panel provided in the embodiments of the present application will be specifically introduced and explained below with reference to the accompanying drawings.

[0078] An embodiment of the present application provides a display substrate, as shown in FIG3 to FIG6A , which includes:

[0079] a first substrate 100;

[0080] A plurality of reflective structures F arranged in an array on the first substrate 100, wherein a first groove C1 is provided in each reflective structure F, and a second groove C2 is provided between two adjacent reflective structures F;

[0081] A plurality of color conversion patterns ZH (including R QD, GQD and TP), the color conversion pattern ZH is arranged in the first groove C1; wherein the color conversion pattern TP is also marked as White ink;

[0082] As shown in FIG6A , the light absorption structure X has a first portion disposed in the second groove C2 , and a second portion disposed on a side of the light reflective structure F away from the first substrate 100 .

[0083] It should be noted that, in order to clearly illustrate the positions of the reflective structure F and the light-absorbing structure X in the display substrate, the light-absorbing structure X is not drawn in FIG3 and FIG4 ; in FIG5 , the reflective structure F is blocked by the light-absorbing structure X and is not drawn.

[0084] In an exemplary embodiment, the display substrate may be an OLED (Organic Light Emitting Diode) display substrate, a Mini LED (Sub-millimeter Light Emitting Diode) display substrate, or a Micro LED (Micro Light Emitting Diode) display substrate.

[0085] For example, the first substrate 100 may include a substrate and a plurality of light-emitting devices arranged in an array on the substrate.

[0086] The type of the above-mentioned light-emitting device is not limited here. For example, the above-mentioned light-emitting device can be a sub-millimeter light-emitting diode (Mini LED), a micro light-emitting diode (Micro Light Emitting Diode), or an organic light-emitting diode (OLED).

[0087] The embodiments of the present application are described by taking the light-emitting device as an OLED and the display substrate as an OLED display substrate as an example.

[0088] In some examples, the substrate may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and this embodiment includes but is not limited thereto.

[0089] In some examples, the substrate may be a rigid substrate or a flexible substrate.

[0090] When the substrate is a flexible substrate, the substrate may include a single layer of flexible material; or, the substrate may include a first flexible material layer, a first inorganic non-metallic material layer, a second flexible material layer, and a second inorganic non-metallic material layer stacked in sequence. The first flexible material layer and the second flexible material layer are made of polyimide (PI), polyethylene terephthalate (PET), or a surface-treated polymer soft film. The first inorganic non-metallic material layer and the second inorganic non-metallic material layer are made of silicon nitride (SiNx) or silicon oxide (SiOx), etc., to improve the water and oxygen resistance of the substrate. The first inorganic non-metallic material layer and the second inorganic non-metallic material layer are also called barrier layers.

[0091] When the substrate is a rigid substrate, the substrate may include a glass substrate or a silicon material substrate.

[0092] In an exemplary embodiment, the reflective structure F refers to a structure having a reflective effect, but it does not exclude that the reflective structure F has a certain light-transmitting effect; for example, the reflective effect of the reflective structure F on light is greater than its light-transmitting effect on light.

[0093] Exemplarily, the reflectivity of the reflective structure F is greater than or equal to a preset value, wherein the preset value ranges from 60% to 90%.

[0094] For example, the reflectivity of the light-reflecting structure F is greater than or equal to 70%, 75%, 80% or 85%.

[0095] The specific material of the reflective structure F is not limited here.

[0096] In some embodiments, the material of the light-reflecting structure F includes metal.

[0097] In some other embodiments, the material of the reflective structure F includes resin, such as white resin.

[0098] Exemplarily, the reflective structure F includes a first reflective structure F1, a second reflective structure F2 and a third reflective structure F3, wherein the first groove C1 in the first reflective structure F1 is used to set the light-transmitting pattern TP, the first groove C1 in the second reflective structure F2 is used to set the red conversion pattern RQD, and the first groove C1 of the third reflective structure F3 is used to set the green conversion pattern GQD.

[0099] Here, there is no limitation on whether the shapes of the planar graphics of the first light-reflecting structure F1 , the second light-reflecting structure F2 and the third light-reflecting structure F3 are the same.

[0100] Illustratively, the inner contour shape of the plane graphic of the above-mentioned first light-reflecting structure F1 is the same as the outer contour shape of the plane graphic of the light-transmitting pattern TP; the inner contour shape of the plane graphic of the above-mentioned second light-reflecting structure F2 is the same as the outer contour shape of the plane graphic of the red conversion pattern RQD; the inner contour shape of the plane graphic of the above-mentioned third light-reflecting structure F3 is the same as the outer contour shape of the plane graphic of the green conversion pattern GQD.

[0101] The shape of the planar outline of the first groove C1 is not limited here. Since the color conversion pattern ZH is disposed in the first groove C1, the planar outline of the first groove C1 can be designed based on the planar shapes of different color conversion patterns ZH. In other words, the planar outline of the first groove C1 can be the same as the planar shape of the color conversion pattern ZH disposed within the first groove C1.

[0102] The cross-sectional shape of the first groove C1 along the direction perpendicular to the plane of the first substrate 100 is not limited here. The cross-sectional shape of the first groove C1 along the direction perpendicular to the plane of the first substrate 100 can be determined based on the cross-sectional shape of the reflective structure F along the direction perpendicular to the plane of the first substrate 100.

[0103] Exemplarily, the color conversion pattern ZH includes a red conversion pattern RQD, a green conversion pattern GQD, and a light-transmitting pattern TP (also labeled as White ink).

[0104] In an exemplary embodiment, the color conversion pattern ZH includes a quantum dot color conversion pattern, wherein a quantum dot is a nanoscale semiconductor. By applying a certain electric field or light pressure to this nano-semiconductor material, it will emit light of a specific frequency, and the frequency of the emitted light will change with the change of the size of the semiconductor. Therefore, by adjusting the size of the nano-semiconductor, the color of the light it emits can be controlled. Because this nano-semiconductor has the property of confining electrons and electron holes, this property is similar to that of atoms or molecules in nature, and therefore it is called a quantum dot.

[0105] In an exemplary embodiment, the excitation light sources for the color conversion patterns ZH are configured to excite the red conversion patterns RQD to emit red light and the green conversion patterns GQD to emit green light. The light-emitting devices are all blue light-emitting devices, i.e., they are all blue light-emitting devices. The blue light emitted by the blue light-emitting devices remains unchanged after passing through the light-transmitting pattern TP.

[0106] In some embodiments, the OD value of the light absorption structure X is greater than or equal to 1 / μm.

[0107] The specific material of the light-absorbing structure X is not limited herein. For example, the material of the light-absorbing structure X may include a resin, such as a black resin. The black resin may include a resin matrix and a black filler added to the resin matrix. The black filler may include carbon black, graphite, graphene, etc.

[0108] In an exemplary embodiment, as shown in FIG. 6A and FIG. 6B , the first portion of the light absorption structure X is disposed in the second groove C2 .

[0109] In an exemplary embodiment, the second portion of the light-absorbing structure X is disposed on a side of the light-reflecting structure F away from the first substrate 100, including but not limited to the following cases:

[0110] The first one, as shown in FIG. 6B , is that the second portion of the light absorbing structure X is disposed on the side of the light reflecting structure F away from the first substrate 100 , and covers a portion of the surface of the light reflecting structure F away from the first substrate 100 .

[0111] The second type, as shown in FIG6A , is that the second portion of the light-absorbing structure X is disposed on the side of the light-reflecting structure F away from the first substrate 100, and the orthographic projection of the light-absorbing structure X on the first substrate 100 covers the orthographic projection of the light-reflecting structure F on the first substrate (the second portion of the light-absorbing structure X covers the entire area of ​​the surface of the light-reflecting structure F on the side away from the first substrate 100).

[0112] In the display substrate provided in the embodiments of the present application, by combining the reflective structure F and the light-absorbing structure X, on the one hand, the reflective structure F can reflect most of the light emitted from the side of the color conversion pattern ZH back to the area of ​​the light-emitting side of the display substrate close to the normal viewing angle, thereby improving the light output rate of the display substrate at the normal viewing angle. On the other hand, by disposing the first portion of the light-absorbing structure X in the second groove C2 and the second portion of the light-absorbing structure X on the side of the reflective structure F away from the first substrate 100, a small amount of light that is not reflected by the reflective structure F can be prevented from being emitted from the side of the color conversion pattern ZH, thereby greatly reducing the problem of light crosstalk in the area between two adjacent color conversion patterns ZH. Thus, the light output brightness and light crosstalk of the display substrate are both taken into account and improved, thereby improving the display effect of the display device manufactured using the display substrate.

[0113] In addition, it should be noted that when the orthographic projection of the light-absorbing structure X on the first substrate 100 covers the orthographic projection of the light-reflecting structure F on the first substrate (the second portion of the light-absorbing structure X covers the entire area of ​​the surface of the light-reflecting structure F on the side away from the first substrate 100), even if some light passes through the reflective structure F and is emitted from the side of the color conversion pattern ZH, this part of the light can be absorbed by the light-absorbing structure X covering the reflective structure F, thereby avoiding the problem of light crosstalk in the area between two adjacent color conversion patterns ZH, further improving and optimizing the display effect.

[0114] In at least one display substrate provided in an embodiment of the present application, as shown in Figures 6A, 6B, 8 and 10, the display substrate further includes a first encapsulation layer 1, which covers the color conversion pattern ZH, the reflective structure F and the bottom of the second groove C2, and a partial area of ​​the first encapsulation layer 1 is arranged between the reflective structure F and the light absorption structure X.

[0115] In an exemplary embodiment, the first encapsulation layer 1 is used to encapsulate and protect the color conversion pattern ZH to isolate it from water vapor and oxygen, thereby preventing the quantum dot material in the color conversion pattern ZH from failing.

[0116] In some embodiments, the first encapsulation layer 1 may include a single film layer. For example, the first encapsulation layer 1 may include an inorganic sub-layer.

[0117] In other embodiments, the first encapsulation layer 1 may include a plurality of film layers stacked together; for example, the first encapsulation layer 1 may include a plurality of inorganic sublayers stacked together; for another example, the first encapsulation layer 1 may include an inorganic sublayer / organic sublayer / inorganic sublayer stacked together.

[0118] The material of the inorganic sublayer may include one or more of silicon nitride, silicon oxide, silicon oxynitride or aluminum oxide; the material of the organic sublayer may include resin, such as polyimide or polyparaxylene.

[0119] Illustratively, the first encapsulation layer 1 includes a silicon oxynitride sublayer, a silicon nitride sublayer, a silicon oxynitride sublayer, and a silicon nitride sublayer, which are sequentially stacked in a direction away from the first substrate 100 .

[0120] In at least one display substrate provided by an embodiment of the present application, the refractive index of the material of the reflective structure F is greater than the refractive index of the material of the first encapsulation layer 1 .

[0121] For example, as shown by the arrows marked in FIG6A , when light is incident from the side of the color conversion pattern ZH (for example, the green conversion pattern GQD) into the reflective structure F, since the refractive index of the material of the reflective structure F is greater than the refractive index of the material of the first encapsulation layer 1, that is, the light is incident from a denser medium to a less dense medium, at this time, the probability of total reflection of the light beam is greatly increased, thereby reflecting the light emitted from the side of the green conversion pattern GQD and emitting from the upper surface of the green conversion pattern GQD, thereby greatly improving the light output efficiency of the display substrate at the positive viewing angle (front), thereby increasing the brightness, improving the display effect, and reducing power consumption.

[0122] In at least one display substrate provided in an embodiment of the present application, as shown in the mark in Figure 6B, the thickness T1 of the light absorption structure X along the direction perpendicular to the plane of the first substrate 100 is greater than the thickness T2 of the light reflective structure F along the direction perpendicular to the plane of the first substrate 100.

[0123] In at least one display substrate provided in an embodiment of the present application, as shown by the mark in Figure 6B, the absolute value of the difference between the thickness T1 of the light absorption structure X in a direction perpendicular to the plane of the first substrate 100 and the thickness T2 of the light reflective structure F in a direction perpendicular to the plane of the first substrate 100 is in the range of 1 μm to 5 μm.

[0124] Illustratively, the thickness T1 of the light-absorbing structure X along the direction perpendicular to the plane of the first substrate 100 is 1.3 μm, 1.5 μm, 1.8 μm, 2.0 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, 3.5 μm, 3.8 μm, 4.0 μm, 4.3 μm, 4.5 μm or 4.8 μm greater than the thickness T2 of the light-reflecting structure F along the direction perpendicular to the plane of the first substrate 100.

[0125] In the embodiment of the present application, by setting the thickness T1 of the light-absorbing structure X in a direction perpendicular to the plane of the first substrate 100 to be greater than the thickness T2 of the light-reflecting structure F in a direction perpendicular to the plane of the first substrate 100, when some light passes through the reflective structure F and is emitted from the side of the color conversion pattern ZH, this light can also be absorbed by the portion of the light-absorbing structure X that is higher than the reflective structure F, thereby avoiding the problem of light crosstalk in the area between two adjacent color conversion patterns ZH, further improving and optimizing the display effect.

[0126] In at least one display substrate provided in an embodiment of the present application, as shown in Figures 6A, 6B, 8, and 10, the display substrate further includes a plurality of filter patterns CF (including RCF, GCF, and BCF). The filter pattern CF is located on a side of the color conversion pattern ZH away from the first substrate 100, and the light absorption structure X is also located between two adjacent filter patterns CF.

[0127] Exemplarily, the color conversion pattern ZH includes a red conversion pattern RQD (first conversion pattern), a green conversion pattern GQD (second conversion pattern) and a light-transmitting pattern TP, and the filter pattern CF includes a red filter pattern RCF, a green filter pattern GCF and a blue filter pattern BCF, wherein the orthographic projection of the red filter pattern RCF on the first substrate 100 overlaps with the orthographic projection of the red conversion pattern RQD on the first substrate 100, the orthographic projection of the green filter pattern GCF on the first substrate 100 overlaps with the orthographic projection of the green conversion pattern GQD on the first substrate 100, and the orthographic projection of the blue filter pattern BCF on the first substrate 100 overlaps with the orthographic projection of the light-transmitting pattern TP on the first substrate 100.

[0128] In the embodiment of the present application, the light absorption structure X is further located between two adjacent filter patterns CF, and is used to directly space the two adjacent filter patterns CF to avoid light crosstalk between the two adjacent filter patterns CF.

[0129] In the embodiments of the present application, the light-absorbing structure X not only reduces light crosstalk between two adjacent color conversion patterns ZH, but also reduces light crosstalk between two adjacent filter patterns CF. This simultaneously addresses the crosstalk between light emitted from the color conversion patterns ZH and light emitted from the filter patterns CF, thereby significantly reducing light crosstalk between two adjacent sub-pixels in the display substrate and enhancing the display quality. A sub-pixel includes a light-emitting device, a color conversion pattern ZH, and a filter pattern CF, which are sequentially arranged.

[0130] In at least one display substrate provided in an embodiment of the present application, as shown in conjunction with Figures 3 and 4, a ratio between a maximum planar dimension D1 of the reflective structure F (taking the third reflective structure F3 around the green conversion pattern GQD as an example) and a thickness T3 of the reflective structure F (taking the third reflective structure F3 around the green conversion pattern GQD as an example) along a direction perpendicular to the plane of the first substrate 100 is in a range of 0.8 to 1.5, that is, D1 / T3 is in a range of 0.8 to 1.5.

[0131] The maximum plane size D1 of the reflective structure F (taking the third reflective structure F3 around the green conversion pattern GQD as an example) refers to the maximum size of the plane graphic of the reflective structure F.

[0132] Exemplarily, the ratio of the maximum planar dimension of the reflective structure F (taking the second reflective structure F2 around the red conversion pattern RQD as an example) to the thickness T3 of the reflective structure F (taking the second reflective structure F2 around the red conversion pattern RQD as an example) along the direction perpendicular to the plane of the first substrate 100 is in the range of 0.8 to 1.5.

[0133] Exemplarily, the ratio of the maximum planar dimension of the reflective structure F (taking the first reflective structure F1 around the light-transmitting pattern TP as an example) to the thickness T3 of the reflective structure F (taking the first reflective structure F1 around the light-transmitting pattern TP as an example) along a direction perpendicular to the plane of the first substrate 100 is in the range of 0.8 to 1.5. The light-transmitting pattern TP is also labeled as White ink.

[0134] In an exemplary embodiment, the ratio of the maximum planar dimension of the reflective structure F to the thickness of the reflective structure F along the direction perpendicular to the plane of the first substrate 100 may be 0.85, 0.90, 0.95, 1.0, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40 or 1.45.

[0135] In the embodiments of the present application, when the ratio of the maximum planar dimension of the reflective structure F to the thickness of the reflective structure F in a direction perpendicular to the plane of the first substrate 100 is less than 0.8, the difficulty of the preparation process increases, resulting in reduced production efficiency; when the ratio of the maximum planar dimension of the reflective structure F to the thickness of the reflective structure F in a direction perpendicular to the plane of the first substrate 100 is greater than 1.5, the thickness of the reflective structure F is relatively small, and when the color conversion pattern ZH is subsequently prepared using a printing process, the problem of color mixing of the printing inks of two adjacent color conversion patterns ZH is very likely to occur, thereby causing display abnormalities.

[0136] In at least one display substrate provided in an embodiment of the present application, as shown in Figures 7 and 8, the cross-sectional figure of the reflective structure F along the direction perpendicular to the plane where the first substrate 100 is located includes a first trapezoid (i.e., a trapezoid as shown in Figure 7), the upper base of the first trapezoid (the surface marked L1) is arranged away from the first substrate 100, and the lower base of the first trapezoid (the surface marked L2) is in contact with the first substrate 100; the length ratio between the lower base of the first trapezoid and the upper base of the first trapezoid (L2: L1) ranges from 1 to 1.2.

[0137] Exemplarily, the length ratio between the lower base of the first trapezoid and the upper base of the first trapezoid (L2:L1) can be 1:1. In this case, the lengths of the lower base of the first trapezoid and the upper base of the first trapezoid are equal, and the first trapezoid is actually a rectangle.

[0138] Exemplarily, the length ratio between the lower base of the first trapezoid and the upper base of the first trapezoid (L2:L1) may be 1:1.1.

[0139] In the embodiment of the present application, by setting the length ratio (L2:L1) between the lower base of the first trapezoid and the upper base of the first trapezoid to be in the range of 1 to 1.2, the side surface of the reflective structure F in contact with the color conversion pattern ZH has a larger slope. When light emitted by the color conversion pattern ZH enters the reflective structure F, a portion of the light is favorably reflected at the interface between the reflective structure F and the color conversion pattern ZH, thereby emitting the light from the front side of the color conversion pattern ZH. This greatly reduces the problem of light crosstalk in the area between two adjacent color conversion patterns ZH and improves the light extraction efficiency of the display substrate.

[0140] In at least one display substrate provided in an embodiment of the present application, as shown in Figures 9 and 10, the cross-sectional figure of the reflective structure F along the direction perpendicular to the plane where the first substrate 100 is located includes a figure formed by splicing a second trapezoid and a third trapezoid. As shown by the marks in Figure 9, the upper base L4 of the second trapezoid and the upper base L4 of the third trapezoid are equal in size and the two are spliced ​​together, the lower base L5 of the second trapezoid is in contact with the first substrate 100, and the lower base L3 of the third trapezoid is in contact with the first encapsulation layer 1.

[0141] Among them, as shown in Figures 9 and 10, the length ratio between the upper base L4 of the second trapezoid and the lower base L5 of the second trapezoid, and the length ratio between the upper base L4 of the third trapezoid and the lower base L3 of the third trapezoid are both in the range of 0.8 to 0.99; that is, the range of L4:L3 is 0.8 to 0.99, and the range of L4:L5 is 0.8 to 0.99.

[0142] Here, there is no limitation on whether the length ratio between the upper base L4 of the third trapezoid and the lower base L3 of the third trapezoid, and the length ratio between the upper base L4 of the second trapezoid and the lower base L5 of the second trapezoid are equal, and the specific length ratio can be determined according to the pixel design requirements of the product.

[0143] Here, there is no limitation on whether the lengths of the lower base L5 of the second trapezoid and the lower base L3 of the third trapezoid are the same.

[0144] Illustratively, the length ratio between the upper base L4 of the second trapezoid and the lower base L5 of the second trapezoid, and the length ratio between the upper base L4 of the third trapezoid and the lower base L3 of the third trapezoid can be one of the following values, such as 0.83, 0.85, 0.88, 0.90, 0.93, 0.95 or 0.98.

[0145] In some embodiments, the reflective structure F is provided with a cross-sectional figure along a direction perpendicular to the plane where the first substrate 100 is located, including a figure formed by splicing a second trapezoid and a third trapezoid, the upper base L4 of the second trapezoid and the upper base L4 of the third trapezoid are equal in size and the two are spliced, the lower base L5 of the second trapezoid is in contact with the first substrate 100, and the lower base L3 of the third trapezoid is in contact with the first encapsulation layer 1, so that the slope of the side of the second trapezoid and the slope of the side of the third trapezoid are opposite (not positive or negative at the same time, and the absolute value of the slope is not limited).

[0146] In some embodiments, the slopes of the sides of the second trapezoid and the slopes of the sides of the third trapezoid are equal in direction (positive or negative) and absolute value of magnitude.

[0147] In the embodiment of the present application, the reflective structure F is provided with a cross-sectional figure perpendicular to the plane of the first substrate 100, which includes a figure formed by splicing two trapezoidal upper bases. In this way, the side of the light-emitting structure F that contacts the color conversion pattern ZH has two parts, and the two parts of the side have two slopes with opposite positive and negative properties. When light emitted from the side of the color conversion pattern ZH impinges on the light-emitting structure F, light emitted from the side of the color conversion pattern ZH in different directions can be largely reflected, thereby improving the reflection efficiency, thereby greatly improving the light emission efficiency from the area near the normal viewing angle on the light-emitting side of the display substrate, and improving the brightness of the display substrate.

[0148] In at least one display substrate provided in an embodiment of the present application, as shown in FIG9 , a ratio between a height H3 of the second trapezoid and a thickness H1 of the reflective structure F in a direction perpendicular to the plane of the first substrate 100 is in a range of 0.1 to 0.4.

[0149] Exemplarily, the height H3 of the second trapezoid is smaller than the height H2 of the third trapezoid.

[0150] For example, the ratio of the height H3 of the second trapezoid to the thickness H1 of the reflective structure F along a direction perpendicular to the plane of the first substrate 100 may be 0.15, 0.2, 0.25, 0.3 or 0.35.

[0151] In the embodiment of the present application, by setting the ratio of the height H3 of the second trapezoid to the thickness H1 of the reflective structure F in a direction perpendicular to the plane of the first substrate 100 to be in the range of 0.1 to 0.4, the area of ​​the portion with the positive slope of the side surface of the light-emitting structure F in contact with the color conversion pattern ZH is smaller than the area of ​​the portion with the negative slope of the side surface of the light-emitting structure F in contact with the color conversion pattern ZH. In this way, when light emitted from the side surface of the color conversion pattern ZH impinges on the light-emitting structure F, light emitted from the side surface of the color conversion pattern ZH in different directions can be largely reflected, thereby improving the reflection efficiency, thereby greatly improving the light emission efficiency from the area of ​​the light-emitting side of the display substrate close to the normal viewing angle, and improving the brightness of the display substrate.

[0152] In at least one display substrate provided by an embodiment of the present application, a thickness T1 of the light absorption structure X in a direction perpendicular to the plane of the first substrate 100 ranges from 12 μm to 20 μm.

[0153] For example, the thickness T1 of the light absorption structure X in a direction perpendicular to the plane of the first substrate 100 may be 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm or 19 μm.

[0154] In at least one display substrate provided in an embodiment of the present application, as shown in Figures 11A, 11B, 11C, 12A, 12B, 12C, 13A, 13B, 13C, 14A, and 14B, at least part of the reflective structure F is connected as one.

[0155] Exemplarily, at least part of the reflective structures F are connected as a whole via the connecting portion LJ.

[0156] In the embodiment of the present application, by connecting a plurality of separately arranged reflective structures F into one, the structural stability of the reflective structure F can be greatly improved, thereby improving the reliability of the display substrate.

[0157] In at least one display substrate provided in an embodiment of the present application, as shown in FIG. 11A , FIG. 11B , FIG. 11C , FIG. 12B , FIG. 12C , FIG. 13A , FIG. 13B , FIG. 13C , FIG. 14A , and FIG. 14B , a plurality of connection portions LJ are provided in at least a portion of the display substrate. The orthographic projections of the connection portions LJ on the first substrate 100 do not overlap with the orthographic projections of the color conversion pattern ZH (including RQD, GQD, and white ink) on the first substrate 100.

[0158] Any two adjacent reflective structures F are respectively connected to the connecting portion LJ as a whole; the connecting portion LJ and the reflective structures F are made of the same material.

[0159] Exemplarily, the materials of the connecting portion LJ and the reflective structure F are both white resin.

[0160] Exemplarily, the connecting portion LJ has the same reflective function as the reflective structure F.

[0161] In at least one display substrate provided in an embodiment of the present application, the plurality of color conversion patterns ZH include a first conversion pattern (e.g., a red conversion pattern RQD), a second conversion pattern (e.g., a green conversion pattern GQD), and a light-transmitting pattern (TP or White ink) of different colors;

[0162] Along the extending direction of the connection portion LJ, both ends of the connection portion LJ are provided with color conversion patterns of at most one color.

[0163] In the extension direction of the connection portion LJ, at most one color conversion pattern is provided at both ends of the connection portion LJ, including but not limited to the following:

[0164] First, along the extending direction of the connection portion LJ, one end of the connection portion LJ is provided with a color conversion pattern, and the other end of the connection portion LJ is provided with a reflective structure F.

[0165] For example, along the extension direction of the connection portion LJ, one end of the connection portion LJ is provided with a red conversion pattern RQD, and the other end of the connection portion LJ is provided with a reflective structure F;

[0166] For example, along the extension direction of the connection portion LJ, one end of the connection portion LJ is provided with a green conversion pattern GQD, and the other end of the connection portion LJ is provided with a reflective structure F;

[0167] For example, along the extending direction of the connection portion LJ, one end of the connection portion LJ is provided with a light-transmitting pattern TP or White ink, and the other end of the connection portion LJ is provided with a light-reflecting structure F.

[0168] Second, along the extending direction of the connecting portion LJ, reflective structures F are provided at both ends of the connecting portion LJ.

[0169] Third, in a partial area of ​​the same display substrate, along the extension direction of the connection portion LJ, a color conversion pattern is provided at one end of the connection portion LJ, and a reflective structure F is provided at the other end of the connection portion LJ; in another partial area of ​​the same display substrate, along the extension direction of the connection portion LJ, reflective structures F are provided at both ends of the connection portion LJ.

[0170] In the embodiment of the present application, compared with Figure 12A, in order to prevent the refraction or reflection of light through the connection portion LJ from interfering with adjacent color conversion patterns, as shown in Figure 12B, by setting the color conversion patterns of at most one color at both ends of the connection portion LJ along the extension direction of the connection portion LJ, while improving the structural stability of the reflective structure F and the reliability of the display substrate, it can largely prevent the refraction or reflection of the connection portion LJ from interfering with adjacent color conversion patterns, further improving the display effect of the display substrate.

[0171] It should be noted that Figures 11A, 11B, 11C, 12A and 12B provide three different settings for the connecting part LJ based on the first pixel arrangement design (color conversion pattern arrangement design); in addition, Figure 12C is based on the arrangement of the reflective structure F and the connecting part LJ in Figure 12B, and the integrated structure of the reflective structure F and the connecting part LJ provided is a top view of the structure.

[0172] Figures 13A and 13B provide two different settings of the connecting part LJ based on the second pixel arrangement design (color conversion pattern arrangement design). In addition, Figure 13C is based on the arrangement of the reflective structure F and the connecting part LJ in Figure 13B, and the provided integrated structure of the reflective structure F and the connecting part LJ is a top view of the structure.

[0173] Figure 14A provides a setting method for the connecting part LJ based on the third pixel arrangement design (color conversion pattern arrangement design). In addition, Figure 14B is based on the arrangement of the reflective structure F and the connecting part LJ in Figure 14A, and the provided integrated structure of the reflective structure F and the connecting part LJ is a top view of the structure.

[0174] The display substrate provided in the embodiment of the present application does not limit the specific structure of the pixel arrangement design, which can be determined according to actual conditions. The above examples are only exemplary descriptions and do not represent limitations on the pixel arrangement design.

[0175] In at least one display substrate provided by an embodiment of the present application, as shown in FIG. 4 , FIG. 12C , FIG. 13C , and FIG. 14B , the second grooves C2 are provided independently of each other.

[0176] Exemplarily, the first portion of the light absorbing structure X is disposed in the second groove C2. Since the second grooves C2 are disposed independently of each other, the first portions of the light absorbing structures X are also disposed independently of each other.

[0177] Exemplarily, as shown in FIG5 , the second parts of the light absorbing structures X may be connected together to improve the light shielding effect.

[0178] It should be noted that the embodiments of the present application only introduce the structures and parts of the display substrate that are related to the invention. The display substrate also includes other film layers and components. The other film layers and components included in the display substrate, as well as the specific methods of the above-mentioned pixel arrangement design, can be referred to the introduction in the relevant technology and will not be repeated here.

[0179] An embodiment of the present application provides a display panel, including the display substrate as described above.

[0180] Exemplarily, the display panel may further include a second substrate, where the second substrate covers the light absorption structure X.

[0181] The specific structure of the display panel can be referred to in the previous description and will not be repeated here.

[0182] In the display panel provided in the embodiment of the present application, by combining the reflective structure F and the light-absorbing structure X, on the one hand, the reflective structure F can reflect most of the light emitted from the side of the color conversion pattern ZH back to the area of ​​the light-emitting side of the display panel close to the normal viewing angle, thereby improving the light output rate of the display panel at the normal viewing angle. On the other hand, by disposing the first portion of the light-absorbing structure X in the second groove C2 and the second portion of the light-absorbing structure X on the side of the reflective structure F away from the first substrate 100, a small amount of light that is not reflected by the reflective structure F can be prevented from being emitted from the side of the color conversion pattern ZH, thereby greatly reducing the problem of light crosstalk in the area between two adjacent color conversion patterns ZH. Thus, the light output brightness and light crosstalk of the display panel are both taken into account and improved, thereby improving the display effect of the display panel.

[0183] An embodiment of the present application provides a display device, including the display panel as described above.

[0184] The above-mentioned display device can be an OLED (Organic Light Emitting Diode) display device, a Mini LED (Mini Light Emitting Diode) display device or a Micro LED (Micro Light Emitting Diode) display device.

[0185] The above-mentioned display device can be a display device such as OLED / Mini LED / Micro LED screen display, as well as any product or component with display function such as television, digital camera, mobile phone, tablet computer, etc. that includes these display devices.

[0186] An embodiment of the present application provides a method for preparing a display substrate, which is applied to prepare the display substrate as described above, and the method includes:

[0187] S01, providing a first substrate 100 as shown in FIG17 (1);

[0188] For example, the first substrate 100 may include a substrate and a plurality of light-emitting devices arranged in an array on the substrate.

[0189] S02, forming a plurality of reflective structures F arranged in an array on the first substrate 100, wherein a first groove C1 is provided in the reflective structure F, and a second groove C2 is provided between two adjacent reflective structures F;

[0190] In an exemplary embodiment, the reflective structure F refers to a structure having a reflective effect, but it does not exclude that the reflective structure F has a certain light-transmitting effect; for example, the reflective effect of the reflective structure F on light is greater than its light-transmitting effect on light.

[0191] Exemplarily, the reflectivity of the reflective structure F is greater than or equal to a preset value, wherein the preset value ranges from 60% to 90%.

[0192] For example, the reflectivity of the light-reflecting structure F is greater than or equal to 70%, 75%, 80% or 85%.

[0193] The specific material of the reflective structure F is not limited here.

[0194] In some embodiments, the material of the light-reflecting structure F includes metal.

[0195] In some other embodiments, the material of the reflective structure F includes resin, such as white resin.

[0196] Exemplarily, the reflective structure F includes a first reflective structure F1, a second reflective structure F2 and a third reflective structure F3, wherein the first groove C1 in the first reflective structure F1 is used to set the light-transmitting pattern TP, the first groove C1 in the second reflective structure F2 is used to set the red conversion pattern RQD, and the first groove C1 of the third reflective structure F3 is used to set the green conversion pattern GQD.

[0197] S03, forming a color conversion pattern ZH (including RQD, GQD and TP) in the first groove C1;

[0198] Exemplarily, the color conversion pattern ZH includes a red conversion pattern RQD, a green conversion pattern GQD, and a light-transmitting pattern TP (also labeled as White ink).

[0199] In practical applications, as shown in FIG16 , a printing process can be used to form the color conversion pattern ZH. Specifically, different colors of ink are printed in the first groove C1 through the printing process, and different color conversion patterns ZH are formed after curing. To minimize the possibility of ink shifting to areas outside the first groove C1 during the printing process (as shown in FIG15 ) and causing poor display, the maximum width R' of the planar pattern of the reflective structure F can be set to be greater than the diameter R of an ink droplet formed when the ink is dropped.

[0200] In some embodiments, the diameter R of an ink droplet may range from 10 μm to 40 μm. For example, the diameter R of an ink droplet may be 12.5 μm, 15 μm, 18 μm, 20 μm, 22.5 μm, 24.8 μm, 25 μm, 28.5 μm, 30 μm, 33.5 μm, 35 μm, or 38.5 μm.

[0201] S04. As shown in FIG. 17 (3), a plurality of light-absorbing structures X are formed. The first portion of the light-absorbing structure X is disposed in the second groove C2, and the second portion of the light-absorbing structure X is disposed on a side of the reflective structure F away from the first substrate 100.

[0202] The specific material of the light-absorbing structure X is not limited herein. For example, the material of the light-absorbing structure X may include a resin, such as a black resin. The black resin may include a resin matrix and a black filler added to the resin matrix. The black filler may include carbon black, graphite, graphene, etc.

[0203] In the display substrate prepared by the preparation method provided in the embodiment of the present application, by combining the reflective structure F and the light-absorbing structure X, on the one hand, the reflective structure F can reflect most of the light emitted from the side of the color conversion pattern ZH back to the area of ​​the light-emitting side of the display substrate close to the normal viewing angle, thereby improving the light output rate of the display substrate at the normal viewing angle; on the other hand, by disposing the first portion of the light-absorbing structure X in the second groove C2 and the second portion of the light-absorbing structure X on the side of the reflective structure F away from the first substrate 100, a small amount of light that is not reflected by the reflective structure F can be prevented from being emitted from the side of the color conversion pattern ZH, thereby greatly reducing the problem of light crosstalk in the area between two adjacent color conversion patterns ZH; thereby, both the light output brightness and the light crosstalk problem of the display substrate are taken into account and improved, thereby improving the display effect of the display device prepared by the display substrate.

[0204] In the method for manufacturing at least one display substrate provided in an embodiment of the present application, after the step of forming a color conversion pattern in the first groove (S03) and before the step of forming a plurality of light absorption structures (S04), the method further includes:

[0205] S05 , forming a first encapsulation layer 1 ; the first encapsulation layer 1 covers the color conversion pattern ZH, the reflective structure F and the bottom of the second groove C2 , and a partial area of ​​the first encapsulation layer 1 is arranged between the reflective structure F and the light absorption structure X.

[0206] In an exemplary embodiment, the first encapsulation layer 1 is used to encapsulate and protect the color conversion pattern ZH to isolate it from water vapor and oxygen, thereby preventing the quantum dot material in the color conversion pattern ZH from failing.

[0207] In some embodiments, the first encapsulation layer 1 may include a single film layer. For example, the first encapsulation layer 1 may include an inorganic sub-layer.

[0208] In other embodiments, the first encapsulation layer 1 may include a plurality of film layers stacked together; for example, the first encapsulation layer 1 may include a plurality of inorganic sublayers stacked together; for another example, the first encapsulation layer 1 may include an inorganic sublayer / organic sublayer / inorganic sublayer stacked together.

[0209] The material of the inorganic sublayer may include one or more of silicon nitride, silicon oxide, silicon oxynitride or aluminum oxide; the material of the organic sublayer may include resin, such as polyimide or polyparaxylene.

[0210] Illustratively, the first encapsulation layer 1 includes a silicon oxynitride sublayer, a silicon nitride sublayer, a silicon oxynitride sublayer, and a silicon nitride sublayer, which are sequentially stacked in a direction away from the first substrate 100 .

[0211] In at least one display substrate provided by an embodiment of the present application, the refractive index of the material of the reflective structure F is greater than the refractive index of the material of the first encapsulation layer 1 .

[0212] As shown by the arrows marked in Figure 6A, when light is incident on the reflective structure F from the side of the color conversion pattern ZH (for example, the green conversion pattern GQD), since the refractive index of the material of the reflective structure F is greater than the refractive index of the material of the first encapsulation layer 1, that is, the light is incident from a denser medium to a less dense medium, at this time, the probability of the light beam undergoing total reflection is greatly increased, so that the light emitted from the side of the green conversion pattern GQD is reflected back to the upper surface of the green conversion pattern GQD and emitted, which greatly improves the light output efficiency of the display substrate at the positive viewing angle (front), thereby increasing the brightness, improving the display effect, and reducing power consumption.

[0213] In the method for manufacturing at least one display substrate provided in an embodiment of the present application, the step of S04, forming a plurality of light-absorbing structures X, wherein a first portion of the light-absorbing structures X is disposed in the second groove C2, and a second portion of the light-absorbing structures X is disposed on a side of the reflective structure F away from the first substrate 100, includes:

[0214] S041, forming a light-absorbing film XB as shown in FIG. 17 (2); the light-absorbing film XB is disposed in the second groove C2 and covers the color conversion pattern ZH and the reflective structure F;

[0215] S042, pre-treating the light-absorbing film XB by using a hot plate heating process, so that the portion of the light-absorbing film XB disposed in the second groove C2 (the area marked by the dotted circle) is pre-cured;

[0216] S043. Patterning the light-absorbing film XB using a photocuring process to obtain a light-absorbing structure X.

[0217] Specifically, S043, patterning the light-absorbing film XB using a photocuring process to obtain the light-absorbing structure X, includes the following steps:

[0218] Sub-step 1: Expose the light-absorbing film XB using a photocuring process combined with a mask;

[0219] Sub-step 2: Develop the light-absorbing film XB after the exposure process to obtain the light-absorbing structure X as shown in FIG. 17 (3).

[0220] In the method for manufacturing at least one display substrate provided in an embodiment of the present application, after the step S04 of forming a plurality of light absorption structures X, the method further includes:

[0221] S06 , as shown in FIG. 6A or FIG. 6B , forming a filter pattern CF (including RCF, GCF, and BCF) between two adjacent light absorption structures X. The filter pattern CF is located on a side of the color conversion pattern ZH away from the first substrate 100 .

[0222] Exemplarily, the color conversion pattern ZH includes a red conversion pattern RQD (first conversion pattern), a green conversion pattern GQD (second conversion pattern) and a light-transmitting pattern TP, and the filter pattern CF includes a red filter pattern RCF, a green filter pattern GCF and a blue filter pattern BCF, wherein the orthographic projection of the red filter pattern RCF on the first substrate 100 overlaps with the orthographic projection of the red conversion pattern RQD on the first substrate 100, the orthographic projection of the green filter pattern GCF on the first substrate 100 overlaps with the orthographic projection of the green conversion pattern GQD on the first substrate 100, and the orthographic projection of the blue filter pattern BCF on the first substrate 100 overlaps with the orthographic projection of the light-transmitting pattern TP on the first substrate 100.

[0223] In the embodiments of the present application, the light-absorbing structure X not only reduces light crosstalk between two adjacent color conversion patterns ZH, but also reduces light crosstalk between two adjacent filter patterns CF. This simultaneously addresses the crosstalk between light emitted from the color conversion patterns ZH and light emitted from the filter patterns CF, thereby significantly reducing light crosstalk between two adjacent sub-pixels in the display substrate and enhancing the display quality. A sub-pixel includes a light-emitting device, a color conversion pattern ZH, and a filter pattern CF, which are sequentially arranged.

[0224] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A display substrate, wherein: The display substrate comprises: first base; a plurality of reflective structures arranged in an array on the first substrate, wherein a first groove is provided in each of the reflective structures, and a second groove is provided between two adjacent reflective structures; a plurality of color conversion patterns, the color conversion patterns being disposed in the first groove; A light absorbing structure, wherein a first portion of the light absorbing structure is disposed in the second groove, and a second portion of the light absorbing structure is disposed on a side of the light reflecting structure away from the first substrate.

2. The display substrate according to claim 1, wherein The orthographic projection of the light-absorbing structure on the first substrate covers the orthographic projection of the light-reflecting structure on the first substrate.

3. The display substrate according to claim 2, wherein: The display substrate further includes a first encapsulation layer, which covers the color conversion pattern, the light reflecting structure and the bottom of the second groove, and a partial area of the first encapsulation layer is arranged between the light reflecting structure and the light absorbing structure.

4. The display substrate according to claim 3, wherein: The refractive index of the material of the reflective structure is greater than the refractive index of the material of the first encapsulation layer.

5. The display substrate according to claim 3, wherein: The thickness of the light-absorbing structure in a direction perpendicular to the plane where the first substrate is located is greater than the thickness of the light-reflecting structure in a direction perpendicular to the plane where the first substrate is located. The display substrate according to claim 5 , wherein: The display substrate further includes a plurality of filter patterns. The filter patterns are located on a side of the color conversion pattern away from the first substrate, and the light absorption structure is located between two adjacent filter patterns.

7. The display substrate according to claim 6, wherein: The ratio of the maximum plane dimension of the reflective structure to the thickness of the reflective structure in a direction perpendicular to the plane of the first substrate is in a range of 0.8 to 1.

5.

8. The display substrate according to claim 6, wherein: The cross-sectional figure of the reflective structure along the direction perpendicular to the plane where the first substrate is located includes a first trapezoid, the upper base of the first trapezoid is arranged away from the first substrate, and the lower base of the first trapezoid is in contact with the first substrate; the length ratio between the lower base of the first trapezoid and the upper base of the first trapezoid is in the range of 1 to 1.

2.

9. The display substrate according to claim 6, wherein: The cross-sectional shape of the reflective structure along a direction perpendicular to the plane where the first substrate is located includes a shape formed by splicing a second trapezoid and a third trapezoid, the upper base of the second trapezoid and the upper base of the third trapezoid are equal in size and spliced together, the lower base of the second trapezoid contacts the first substrate, and the lower base of the third trapezoid contacts the first encapsulation layer; The length ratio between the upper base of the second trapezoid and the lower base of the second trapezoid, and the length ratio between the upper base of the third trapezoid and the lower base of the third trapezoid are both in the range of 0.8 to 0.

99.

10. The display substrate according to claim 9, wherein: The ratio of the height of the second trapezoid to the thickness of the reflective structure in a direction perpendicular to the plane of the first substrate is in a range of 0.1 to 0.

4.

11. The display substrate according to claim 6, wherein: An absolute value of a difference between a thickness of the light-absorbing structure in a direction perpendicular to a plane where the first substrate is located and a thickness of the light-reflecting structure in a direction perpendicular to a plane where the first substrate is located is in a range of 1 μm to 5 μm.

12. The display substrate according to claim 6, wherein: The thickness of the light absorption structure in a direction perpendicular to the plane of the first substrate ranges from 12 μm to 20 μm.

13. The display substrate according to any one of claims 1 to 12, wherein At least part of the reflective structures are connected as one body.

14. The display substrate according to claim 13, wherein: A plurality of connecting portions are provided in at least a portion of the display substrate, wherein the orthographic projections of the connecting portions on the first substrate do not overlap with the orthographic projections of the color conversion patterns on the first substrate; Any two adjacent reflective structures are respectively connected to the connecting portion as a whole; the connecting portion and the reflective structures are made of the same material.

15. The display substrate according to claim 14, wherein: The plurality of color conversion patterns include a first conversion pattern, a second conversion pattern, and a light-transmitting pattern having different colors; Along the extending direction of the connecting portion, at most two ends of the connecting portion are provided with the color conversion pattern of one color.

16. The display substrate according to claim 14, wherein: The second grooves are arranged independently of each other.

17. A display panel, wherein: The display substrate comprises the display substrate according to any one of claims 1 to 16.

18. A method for preparing a display substrate, wherein: The method for preparing a display substrate according to any one of claims 1 to 16 comprises: providing a first substrate; forming a plurality of reflective structures arranged in an array on the first substrate, wherein a first groove is provided in each of the reflective structures, and a second groove is provided between two adjacent reflective structures; forming a color conversion pattern in the first groove; A plurality of light absorbing structures are formed, wherein a first portion of the light absorbing structure is disposed in the second groove, and a second portion of the light absorbing structure is disposed on a side of the light reflecting structure away from the first substrate.

19. The method for preparing a display substrate according to claim 18, wherein: After the step of forming the color conversion pattern in the first groove and before the step of forming the plurality of light absorption structures, the method further includes: A first encapsulation layer is formed; the first encapsulation layer covers the color conversion pattern, the reflective structure and the bottom of the second groove, and a partial area of the first encapsulation layer is arranged between the reflective structure and the light absorbing structure.

20. The method for preparing a display substrate according to claim 18, wherein: The step of forming a plurality of light absorbing structures, wherein a first portion of the light absorbing structure is disposed in the second groove, and a second portion of the light absorbing structure is disposed on a side of the light reflecting structure away from the first substrate comprises: forming a light-absorbing film; the light-absorbing film is disposed in the second groove and covers the color conversion pattern and the light-reflecting structure; Pre-treating the light-absorbing film by a hot plate heating process so that the portion of the light-absorbing film disposed in the second groove is pre-solidified; The light absorbing film is patterned by a photocuring process to obtain the light absorbing structure. structure.

21. The method for preparing a display substrate according to claim 18, wherein: After the step of forming a plurality of light absorption structures, the method further includes: A light filtering pattern is formed between two adjacent light absorption structures, and the light filtering pattern is located on a side of the color conversion pattern away from the first substrate.

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