Display substrate and display panel

Abstract

The present application provides a display substrate and a display panel, which relate to the field of display technology. The display panel can significantly improve light conversion efficiency and display effects. The display substrate includes: a color conversion layer, including a sub-pixel defining structure and a first color conversion unit; the first color conversion unit is located between two adjacent sub-pixel defining structures and is configured to convert incident initial wavelength band light into target wavelength band light; a color filter layer, located between the color conversion layer and the substrate, including a color filter unit, the color filter unit is configured to transmit the target wavelength band light emitted by the first color conversion unit and reflect the initial wavelength band light; a light refraction layer, located between the color filter layer and the color conversion layer, including a first light refraction unit, the first light refraction unit including at least two material portions with different refractive indices in the thickness direction, and the orthographic projection of the first light refraction unit on the substrate at least partially overlaps with the orthographic projection of the first color conversion unit on the substrate. The present application is applicable to the production of display substrates.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) display technology has been widely used in televisions, laptops, mobile phones, and other fields. Quantum dots (QDs), as a new type of luminescent material, offer advantages such as high light color purity, high quantum efficiency, tunable emission color, and long lifespan. QD-OLED technology, which combines blue OLEDs and QDs, has attracted attention. However, the current low light conversion efficiency of this technology affects the display quality. Summary of the Invention

[0003] Embodiments of the present application provide a display substrate and a display panel, which can significantly improve light conversion efficiency, thereby improving display effects.

[0004] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0005] In one aspect, a display substrate is provided, comprising:

[0006] substrate;

[0007] a color conversion layer located on one side of the substrate, the color conversion layer comprising a plurality of sub-pixel defining structures and a plurality of first color conversion units; the first color conversion unit being located between two adjacent sub-pixel defining structures and configured to convert incident light of an initial wavelength band into light of a target wavelength band;

[0008] a color filter layer located between the color conversion layer and the substrate, the color filter layer comprising a plurality of color filter units, the color filter units being configured to transmit the target wavelength band light emitted by the first color conversion unit and reflect the initial wavelength band light;

[0009] a light refraction layer located between the color filter layer and the color conversion layer, the light refraction layer including a plurality of first light refraction units, the first light refraction units including at least two material portions with different refractive indices in a thickness direction, and an orthographic projection of the first light refraction units on the substrate at least partially overlapping with an orthographic projection of the first color conversion unit on the substrate.

[0010] Optionally, the first light refraction unit includes a first refraction part and a second refraction part, the material of the first refraction part includes a material having a first refractive index, the material of the second refraction part includes a material having a second refractive index, and the first refractive index and the second refractive index are different.

[0011] Optionally, the first light refraction unit has a uniform thickness.

[0012] Optionally, a cross section of one of the first refractive portion and the second refractive portion along a direction parallel to the plane where the substrate is located increases along a first direction, and the first direction is a direction from close to the substrate to far away from the substrate.

[0013] Optionally, the thickness of the first refractive portion decreases along a second direction, and the thickness of the second refractive portion increases along the second direction, and the second direction is parallel to the direction of the plane where the substrate is located.

[0014] Optionally, the thickness of the first refractive portion decreases linearly along the second direction, and the thickness of the second refractive portion increases linearly along the second direction.

[0015] Optionally, a thickness of one of the first refractive portion and the second refractive portion first increases and then decreases along a second direction, and the second direction is parallel to a direction of a plane where the substrate is located.

[0016] Optionally, the refractive index of either the first refractive portion or the second refractive portion is variable.

[0017] Optionally, the display substrate further includes a first electrode layer and a second electrode layer, the first electrode layer is located on a side of the color filter layer away from the light refraction layer, and the second electrode layer is located on a side of the light refraction layer close to the color conversion layer.

[0018] Optionally, the light refraction layer further includes a plurality of second light refraction units, and the second light refraction units are located between two adjacent first light refraction units.

[0019] Optionally, the material of the second light refraction unit includes a material having the first refractive index;

[0020] Alternatively, the material of the second light refraction unit includes a material having the second refractive index;

[0021] Alternatively, the material of the second light refraction unit is the same as the material of the sub-pixel defining structure.

[0022] Optionally, the second light refraction unit includes a first material sublayer and a second material sublayer stacked together, the material of the first material sublayer includes a material having the first refractive index, and the material of the second material sublayer includes a material having the second refractive index.

[0023] Optionally, the color conversion layer further includes a plurality of second color conversion units; the second color conversion unit is located between two adjacent sub-pixel defining structures and is configured not to change the wavelength band of the incident initial wavelength band light;

[0024] The orthographic projections of the plurality of second color conversion units on the substrate and the orthographic projections of the color filter layer on the substrate do not overlap with each other;

[0025] The light refraction layer further includes a plurality of third light refraction units, and orthographic projections of the third light refraction units on the substrate at least partially overlap with orthographic projections of the second color conversion units on the substrate.

[0026] Optionally, the material of the third light refraction unit is the same as that of the second color conversion unit.

[0027] Optionally, the structure of the third light refraction unit is the same as that of the first light refraction unit;

[0028] Alternatively, the structure of the third light refraction unit is the same as that of the second light refraction unit.

[0029] Optionally, the display substrate further includes a color film layer, which is located between the color filter layer and the substrate. The color film layer includes a plurality of color film units, and the color film units are configured to transmit the target band light emitted by the color filter unit and absorb non-target band light.

[0030] On the other hand, a display panel is provided, comprising the above-mentioned display substrate.

[0031] Optionally, the display panel further includes a plurality of light-emitting units;

[0032] The light emitting unit is disposed on the light incident side of the color conversion layer of the display substrate and is configured to emit light in an initial wavelength band.

[0033] Embodiments of the present application provide a display substrate and a display panel, which include: a substrate; a color conversion layer located on one side of the substrate, the color conversion layer including a plurality of sub-pixel defining structures and a plurality of first color conversion units; the first color conversion unit is located between two adjacent sub-pixel defining structures and is configured to convert incident initial wavelength band light into target wavelength band light; a color filter layer located between the color conversion layer and the substrate, the color filter layer including a plurality of color filter units, the color filter units being configured to transmit the target wavelength band light emitted by the first color conversion unit and reflect the initial wavelength band light; a light refraction layer located between the color filter layer and the color conversion layer, the light refraction layer including a plurality of first light refraction units, the first light refraction units including at least two material portions with different refractive indices in a thickness direction, and the orthographic projection of the first light refraction unit on the substrate at least partially overlaps with the orthographic projection of the first color conversion unit on the substrate.

[0034] Then, when the above-mentioned display substrate is applied to a display panel, the color filter unit of the color filter layer can reflect the initial wavelength band light that has not been converted by the first color conversion unit of the color conversion layer, allowing it to re-enter the color conversion layer, thereby improving the light conversion efficiency. In addition, the target wavelength band light emitted by the first color conversion unit is incident on the color filter portion through the first light refraction unit of the light refraction layer. Since the first light refraction unit includes at least two material portions with different refractive indices in the thickness direction, the target wavelength band light emitted by the first color conversion unit has its optical path changed after passing through the first light refraction unit and can enter the color filter layer at an incident angle α (α is an acute angle). The initial wavelength band light reflected by the color filter layer can re-enter the color conversion layer in a direction non-perpendicular to the color filter layer, thereby increasing the optical path of this part of the light in the color conversion layer, thereby allowing more light to be converted into target wavelength band light, further improving the light conversion efficiency.

[0035] 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

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description 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.

[0037] Figure 1-13 Schematic diagrams of various structures of display substrates provided in embodiments of the present application;

[0038] Figure 14 and Figure 15 Two structural schematic diagrams of display panels provided in embodiments of the present application. DETAILED DESCRIPTION

[0039] 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.

[0040] In the embodiments of the present application, words such as "first", "second", and "third" are used to distinguish 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.

[0041] In the embodiments of the present application, “a plurality of” means two or more, unless otherwise clearly defined.

[0042] 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.

[0043] In the related art, a QD-OLED display includes an OLED light-emitting unit, a quantum dot color conversion layer, and a filter layer arranged on the light-emitting side of the quantum dot color conversion layer. The filter layer can reflect blue light, allowing it to re-enter the color conversion layer, while also transmitting red and green light. However, the blue light reflected by the filter layer is often perpendicular or nearly perpendicular to the plane where the OLED light-emitting unit is located. As a result, the blue light reflected by the filter layer has a short optical path in the color conversion layer, which is not conducive to full conversion into red or green light. To achieve full conversion, the thickness of the color conversion film layer must be greatly increased, which is not conducive to thinning the device. At the same time, using a thicker color conversion layer is not conducive to saving quantum dot materials and is more expensive.

[0044] Based on the above, the embodiment of the present application provides a display substrate, Figure 1 and Figure 2 As shown, including:

[0045] Substrate 20. The material of the substrate is not limited and can be selected according to actual conditions. For example, the material of the substrate can be glass or polymer material.

[0046] The color conversion layer 1 is located on one side of the substrate 20. The color conversion layer 1 includes multiple sub-pixel defining structures 5 and multiple first color conversion units 21. The first color conversion unit 21 is located between two adjacent sub-pixel defining structures 5 and is configured to convert the incident initial band light into target band light.

[0047] The color filter layer 4 is located between the color conversion layer and the substrate. The color filter layer 4 includes a plurality of color filter units 41. The color filter units 41 are configured to transmit the target wavelength band light emitted by the first color conversion unit 21 and reflect the initial wavelength band light.

[0048] The light refraction layer is located between the color filter layer 4 and the color conversion layer 1. The light refraction layer includes a plurality of first light refraction units 22. The first light refraction unit 22 includes at least two material portions with different refractive indices in the thickness direction, and the orthographic projection of the first light refraction unit 22 on the substrate 20 at least partially overlaps with the orthographic projection of the first color conversion unit 21 on the substrate 20.

[0049] There is no limitation on the specific wavelengths of the above-mentioned initial wavelength band light and target wavelength band light. For example, the wavelength of the initial wavelength band light may be 450-480nm, and the light in this wavelength band is blue light; the wavelength of the target wavelength band light may be 622-760nm, and the light in this wavelength band is red light; or, the wavelength of the target wavelength band light may also be 500-560nm, and the light in this wavelength band is green light. The above-mentioned multiple first color conversion units may be configured to convert the initial wavelength band light into the same target wavelength band light; or, the multiple first color conversion units may be configured to convert the initial wavelength band light into different target wavelength band lights. For example, the multiple first color conversion units are divided into two groups, one group converts the initial wavelength band light into one target wavelength band light (for example, red light), and the other group converts the initial wavelength band light into another target wavelength band light (for example, green light). In QD-OLED display panels, red light band and green light band are generally selected as target band light, blue light band is used as initial band light, and multiple first color conversion units are divided into red conversion units and green conversion units. The red conversion unit is configured to convert the blue light band into the red light band (that is, convert blue light into red light), and the green conversion unit is configured to convert the blue light band into the green light band (that is, convert blue light into green light). Figure 1 and Figure 2 In the figure, the first color conversion unit on the left is a red conversion unit, and the first color conversion unit on the right is a green conversion unit.

[0050] The material of the first color conversion unit is not limited. For example, the first color conversion unit may include a quantum dot conversion layer, an inorganic phosphor conversion layer, or an organic fluorescent conversion layer. The quantum dot conversion layer may include a transparent matrix material and quantum dots dispersed in the transparent matrix material, the inorganic phosphor conversion layer may include a transparent matrix material and inorganic phosphors dispersed in the transparent matrix material, and the organic fluorescent conversion layer may include a transparent matrix material and an organic fluorescent material dispersed in the transparent matrix material. The transparent matrix material may include a transparent organic material, such as a resin, a cured photoresist resin, a cured ink, or the like. The embodiments of this application are described using the example of the first color conversion unit including a quantum dot conversion layer.

[0051] To further increase the optical path length of light in the first color conversion unit and enhance light output uniformity, the first color conversion unit may also include scattering particles. These scattering particles can scatter, or even multiply scatter, light entering the first color conversion unit, further increasing the optical path length of the original wavelength band of light reflected by the color filter unit to the first color conversion unit, thereby further improving light conversion efficiency. The scattering particles can be made of a high-refractive-index inorganic semiconductor material with a particle size between 5 nanometers and 1 millimeter. Other particle sizes are also possible and are not limited here.

[0052] The above-mentioned pixel-defining structure can avoid the mutual influence of adjacent first color conversion units, thereby reducing the risk of cross-color and improving the display contrast; in addition, in order to further increase the optical path of light in the first color conversion unit, thereby further improving the light conversion efficiency, the pixel-defining structure can also be configured to have a scattering and / or reflective effect on light. The thickness range of the pixel-defining structure can be 6-20 microns, and its material can include resin; in order to improve the scattering effect, the pixel-defining structure can also include scattering particles; the scattering particles can be high-refractive-index inorganic semiconductor materials with a particle size between 5 nanometers and 1 mm. Of course, the particle size of the scattering particles can also be other values, which are not limited here. The cross-section of the pixel-defining structure along the direction perpendicular to the plane where the substrate is located can be a regular trapezoid, an inverted trapezoid or a rectangle, etc. The drawings of the embodiments of this application are all drawn using a rectangle as an example.

[0053] The pixel-defining structure can be black, gray, or yellow. The gray and yellow pixel-defining structures have reflective properties, capable of reflecting light incident on the pixel-defining structure. The yellow pixel-defining structure has a stronger reflective effect in the yellow wavelength band. Furthermore, the pixel-defining structure can be a gray pixel-defining structure containing scattering particles, or a yellow pixel-defining structure containing scattering particles, without limitation.

[0054] The above-mentioned pixel defining structure may also be provided with the following surface on one side close to the first color conversion unit: Figure 7The metal layer 51 shown in the figure can further improve the reflection effect. The material of the metal layer can be metal (such as aluminum, etc.) and metal alloy, which is not limited here. The thickness of the metal layer can range from 200 to 400 nanometers, wherein, Figure 7 As shown, the thickness of the metal layer 51 refers to the horizontal thickness L along a direction parallel to the plane where the substrate is located.

[0055] It should be noted that the first color conversion unit can be formed by coating and photolithographically etching a photoresist containing a wavelength conversion material between adjacent pixel defining structures; or, the first color conversion unit can be formed by an inkjet printing process and curing ink containing a wavelength conversion material; of course, other processes can also be used, which are not limited here.

[0056] The adjacent color filter units can be as follows Figure 2 Alternatively, it can be set as shown in Figure 1 The discontinuous setting shown is not limited here. The structure and material of the color filter unit are not limited and need to be determined according to the target band light and the initial band light. Figure 1 As shown, the above-mentioned multiple color filter units 41 correspond to multiple first color conversion units 21 respectively. Each color filter unit can simultaneously transmit different target wavelength bands of light and reflect the initial wavelength band light; or, each color filter unit can only transmit a single target wavelength band of light and reflect the initial wavelength band of light. This is not limited here and needs to be determined according to the structure and material of the color filter unit. For example, if the initial wavelength band light is blue light and the target wavelength band light is red light and green light, since the wavelength of blue light is smaller than that of green light and red light, the color filter unit can adopt a long-pass filter design structure. The long-pass filter design can transmit light above a certain wavelength and reflect light below the wavelength. Specifically, the color filter unit may include a first material layer and a second material layer that are alternately and repeatedly stacked, and the refractive index of the first material layer is smaller than that of the second material layer; wherein the first material layer may include one of magnesium fluoride (MgF2) and silicon dioxide (SiO2); and the second material layer may include one of zinc sulfide (ZnS) or titanium dioxide (TiO2); thereby achieving transmission of red light and green light and reflection of blue light. Of course, other materials can also be used to form the first material layer and the second material layer, respectively, to achieve transmission of target wavelength band light except red and green light and reflection of the original wavelength band light except blue light. The thickness of the above-mentioned color filter unit is not limited. For example, the thickness of the color filter unit can range from 0.5 to 5 μm, preferably 1 to 2 μm.

[0057] The first light refraction unit comprises at least two material parts with different refractive indices in the thickness direction. The thickness direction refers to Figure 1 and Figure 2 The CD direction shown is the direction perpendicular to the plane of the substrate; the shapes of the two material parts with different refractive indices are not limited here, for example, Figure 1 and Figure 2 In the figure, the first light refraction unit 22 is illustrated as an example including a first refraction portion 221 and a second refraction portion 222.

[0058] The orthographic projection of the first light refraction unit on the substrate and the orthographic projection of the first color conversion unit on the substrate at least partially overlap means that the orthographic projection of the first light refraction unit on the substrate and the orthographic projection of the first color conversion unit on the substrate may partially overlap or completely overlap; in order to better improve the light conversion efficiency, the latter may be selected. Figure 1 and Figure 2 The illustration is made by taking the case where the orthographic projection of the first light refraction unit on the substrate and the orthographic projection of the first color conversion unit on the substrate completely overlap as an example.

[0059] In the above-mentioned light refraction layer, the plurality of first light refraction units 41 may be as follows: Figure 1 and Figure 2 Alternatively, a second light refraction unit may be provided between adjacent first light refraction units, which is not limited here.

[0060] It should be noted that when the display substrate is used in a display panel, the display panel can be formed by a box-matching process or an On-EL process. If the box-matching process is adopted, a light-emitting unit can be made on the first substrate to form a first substrate, and a color filter layer, a light refraction layer, a color conversion layer and other film layers can be made in sequence on the second substrate to form a second substrate. The first substrate and the second substrate are then box-matched to form a display panel; at this time, the above-mentioned display substrate can be used as a second substrate, and the above-mentioned substrate can be used as a second substrate. If the On-EL process is adopted, a light-emitting unit, a color conversion layer, a light refraction layer, a color filter layer, a color filter layer and a packaging film and other film layers can be made in sequence on the base to form a display panel; at this time, the above-mentioned display substrate can also include a base, and a light-emitting unit formed on the base, etc., and the above-mentioned substrate can be used as a packaging film. Of course, the above-mentioned display substrate can also include the following Figure 1 The flat film 11, black matrix 12, color filter layer 13 and other structures shown here only introduce the structures related to the invention points, and other structures are not described in detail.

[0061] An embodiment of the present application provides a display substrate, which is applied to a display panel. The color filter unit of the color filter layer can reflect the initial wavelength band light that has not been converted by the first color conversion unit of the color conversion layer, so that it re-enters the color conversion layer, thereby improving the light conversion efficiency. In addition, the target wavelength band light emitted by the first color conversion unit is incident on the color filter portion through the first light refraction unit of the light refraction layer. Since the first light refraction unit includes at least two material portions with different refractive indices in the thickness direction, the target wavelength band light emitted by the first color conversion unit changes its optical path after passing through the first light refraction unit, and can be incident on the color filter layer at an incident angle α (α is an acute angle). The initial wavelength band light reflected by the color filter layer can re-enter the color conversion layer in a direction non-perpendicular to the color filter layer, thereby increasing the optical path of this part of the light in the color conversion layer, thereby allowing more light to be converted into target wavelength band light, further improving the light conversion efficiency. For example, refer to Figure 1 and Figure 2 As shown, the incident light a is perpendicularly incident on the first refractive portion 221 of the first light refraction unit 22 and is incident on the second refractive portion 222 at an incident angle α1. Due to the different refractive indices of the first and second refractive portions, the light a is refracted when passing through the interface between the first and second refractive portions and is emitted at a refraction angle α2, thereby changing the optical path and ultimately causing the light a to enter the color filter layer at an acute angle α (α is an acute angle). Then, the initial wavelength band light b reflected by the color filter layer re-enters the first light refraction unit 22 in a direction non-perpendicular to the color filter layer. The optical path of this part of the light in the first light refraction unit 22 is increased, which is conducive to being fully converted into the target wavelength band light. In addition, the target wavelength band light c is emitted through the color filter unit 41. On the other hand, the full conversion of the light can be completed without increasing the thickness of the color conversion layer, which is conducive to the thinning of the device and the reduction of the cost of the color conversion layer.

[0062] Optional, reference Figure 1-13 As shown, the first light refraction unit includes a first refraction portion 221 and a second refraction portion 222 , the first refraction portion is made of a material having a first refractive index, the second refraction portion is made of a material having a second refractive index, and the first refractive index and the second refractive index are different.

[0063] The materials of the first and second refractive portions are not limited herein. For example, the first and second refractive portions can be made of organic materials (e.g., organic resins) or inorganic materials having different refractive indices. The first refractive index can be greater than the second refractive index, or the first refractive index can be less than the second refractive index, without limitation herein.

[0064] In addition, the relative positions of the first refractive portion and the second refractive portion are not limited here, for example, refer to Figure 1-13As shown, along the thickness direction (i.e., CD direction) of the first light refraction unit 22, the first refraction portion 221 is farther away from the color filter unit 41 than the second refraction portion 222. The drawings of the embodiments of this application illustrate this as an example. In this structure, the first refraction portion and the first color conversion unit can be an integrated structure, that is, the first refraction portion and the first color conversion unit can be made of the same material and formed in a single process. Alternatively, the first refraction portion and the first color conversion unit can be formed separately using different materials. Alternatively, along the thickness direction of the first light refraction unit, the first refraction portion is closer to the color filter unit than the second refraction portion.

[0065] The specific structures of the first refractive portion and the second refractive portion are not limited here and can be determined according to actual conditions.

[0066] The first light refraction unit has a simple structure and is easy to implement.

[0067] In order to improve the light output effect and reduce the manufacturing difficulty, the first light refraction unit has a uniform thickness. Figure 1 As shown, the first light refraction unit 22 is arranged along a direction perpendicular to the plane where the substrate 20 is located ( Figure 1 The thickness in the CD direction shown is the same everywhere.

[0068] Optionally, a cross section of one of the first refractive portion and the second refractive portion along a direction parallel to the plane where the substrate is located increases along a first direction, and the first direction is a direction from close to the substrate to far away from the substrate.

[0069] It should be noted that if the cross section of one of the first refractive portion and the second refractive portion along the direction parallel to the plane where the substrate is located increases along the first direction; then the cross section of the other along the direction parallel to the plane where the substrate is located decreases along the first direction, so as to ensure that the first light refraction unit has a uniform thickness.

[0070] by Figure 1 The positional relationship between the first refractive portion 221 and the second refractive portion 22 is described as an example. Figure 1 In the embodiment, the first refractive portion 221 is parallel to the plane where the substrate is located ( Figure 1 The cross section along the first direction ( Figure 1 At this time, the second refractive portion 222 increases along the direction parallel to the plane of the substrate ( Figure 1 The cross section along the first direction ( Figure 1 The specific manner of increasing and decreasing is not limited here, and for example, it can be linear increasing and linear decreasing; or it can be nonlinear increasing and nonlinear decreasing.

[0071] Optionally, the thickness of the first refractive portion decreases along the second direction, and the thickness of the second refractive portion increases along the second direction, and the second direction is parallel to the direction of the plane where the substrate is located.

[0072] The thickness of the first refractive portion refers to the thickness of the first refractive portion along a direction perpendicular to the plane where the substrate is located, and the thickness of the second refractive portion refers to the thickness of the second refractive portion along a direction perpendicular to the plane where the substrate is located.

[0073] The specific manner in which the thickness of the first refractive portion decreases along the second direction is not limited. For example, the thickness of the first refractive portion may decrease linearly along the second direction, or may decrease nonlinearly along the second direction. The specific manner in which the thickness of the second refractive portion increases along the second direction is not limited. For example, the thickness of the second refractive portion may increase linearly along the second direction, or may increase nonlinearly along the second direction.

[0074] Optionally, in order to reduce manufacturing difficulty, the thickness of the first refractive portion decreases linearly along the second direction, and the thickness of the second refractive portion increases linearly along the second direction.

[0075] by Figure 1-5 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 1-5 As shown, the thickness of the first refractive portion 221 ( Figure 1 and Figure 2 The thickness of the second refractive portion 222 decreases linearly along the second direction (CE direction), and the thickness of the second refractive portion 222 increases linearly along the second direction (CE direction). A continuous interface can be formed between the first refractive portion and the second refractive portion, and the interface is a smooth inclined surface.

[0076] Optionally, the thickness of one of the first refractive portion and the second refractive portion first increases and then decreases along the second direction, and the second direction is parallel to the direction of the plane where the substrate is located.

[0077] by Figure 6 and Figure 10 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 6 and Figure 10 As shown, the thickness of the first refractive portion 221 increases first and then decreases along the second direction (CE direction). The cross-sectional shape of the first refractive portion along the direction perpendicular to the plane where the substrate is located can be as follows: Figure 6 The triangle shown, or Figure 10 The arc shown.

[0078] Figure 6 and Figure 10In the figure, the light path is depicted by taking the case where the refractive index of the first refractive portion 221 is greater than the refractive index of the second refractive portion 222 (ie, the first refractive index is greater than the second refractive index). Figure 10 In the embodiment, the shape of the first refractive portion 221 is similar to a convex lens (ie, thick in the middle and thin on both sides); Figure 6 and Figure 10 In the embodiment, after the light passes through the first color conversion unit and the first light refraction unit, it can be converged together, thereby improving the display brightness.

[0079] It should be noted that Figure 6 and Figure 10 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is illustrated as an example. The first refraction portion 221 and the first color conversion unit 21 can be made of different materials respectively; or, the first refraction portion 221 and the first color conversion unit 21 can be an integrated structure and manufactured through a single process.

[0080] refer to Figure 13 As shown, the first refraction portion 221 and the first color conversion unit 21 can be an integrated structure, that is, the first refraction portion and the first color conversion unit are made of the same material and formed through a single process. In order to facilitate the distinction between the first refraction portion 221 and the first color conversion unit 21, Figure 13 The two are separated by a dotted line in the figure, but the dotted line does not exist in the actual product. In order to achieve the convergence effect of light and improve the display effect, Figure 13 In the embodiment, the refractive index of the first refractive portion 221 is greater than that of the second refractive portion 222.

[0081] Optionally, the thickness of one of the first refractive portion and the second refractive portion first decreases and then increases along a second direction, and the second direction is parallel to the direction of the plane where the substrate is located.

[0082] by Figure 7 and Figure 9 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 7 and Figure 9 As shown, the thickness of the second refractive portion 222 increases first and then decreases along the second direction (CE direction), and the cross-sectional shape of the second refractive portion along the direction perpendicular to the plane where the substrate is located can be as follows: Figure 7 The triangle shown, or Figure 9 The arc shown.

[0083] Figure 7 and Figure 9 In the figure, the light path is depicted by taking the case where the refractive index of the first refractive portion 221 is greater than the refractive index of the second refractive portion 222 (ie, the first refractive index is greater than the second refractive index). Figure 9 In the embodiment, the shape of the first refractive portion 221 is similar to a concave lens (i.e., thin in the middle and thick on both sides); Figure 7and Figure 9 In the embodiment, light will produce a diverging effect after passing through the first color conversion unit and the first light refraction unit.

[0084] refer to Figure 12 As shown, the first refraction portion 221 and the first color conversion unit 21 may be an integral structure, that is, the first refraction portion and the first color conversion unit are made of the same material and formed through a single process. Figure 12 The first refraction portion 221 and the first color conversion unit 21 shown can be made by printing ink technology, and the coffee ring effect of the printing ink is used to form a first refraction portion that is thin in the middle and thick on both sides after the ink dries. In order to easily distinguish the first refraction portion 221 from the first color conversion unit 21, Figure 12 The two are separated by a dotted line in the figure, but the dotted line does not exist in the actual product. In order to achieve the convergence effect of light and improve the display effect, Figure 12 In the embodiment, the refractive index of the first refractive portion 221 is smaller than the refractive index of the second refractive portion 222 .

[0085] Optionally, the first refractive portion includes a plurality of protrusions arranged along the second direction, the second refractive portion includes a plurality of grooves arranged along the second direction, the protrusions and the grooves match, and the second direction is parallel to the direction of the plane where the substrate is located.

[0086] The specific number and shape of the protrusions and grooves are not limited here. The cross-sectional shape of the protrusions along the direction perpendicular to the plane of the substrate can be triangular, rectangular, semicircular, etc. The cross-sectional shape of the grooves along the direction perpendicular to the plane of the substrate can be triangular, rectangular, semicircular, etc.

[0087] by Figure 8 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 8 As shown, the first refractive portion 221 includes two protrusions ( Figure 8 Not marked), the second refractive portion 222 includes two grooves ( Figure 8 Not marked), the protrusions and grooves match, and the second direction (CE direction) is parallel to the direction of the plane where the substrate is located.

[0088] Optionally, in order to better control the light emission direction, the refractive index of either the first refractive portion or the second refractive portion may be variable.

[0089] For example, the refractive index of the second refractive portion is fixed, and the refractive index of the first refractive portion can be changed under the action of an electric field. The material of the first refractive portion can be liquid crystal, and the refractive index of the liquid crystal can be changed under the action of an electric field.

[0090] Optionally, the display substrate further includes a first electrode layer and a second electrode layer, the first electrode layer is located on a side of the color filter layer away from the light refraction layer, and the second electrode layer is located on a side of the light refraction layer close to the color conversion layer.

[0091] by Figure 11 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 11 As shown, the refractive index of the first refraction portion 221 is variable, and it can be made of liquid crystal; the display substrate further includes a first electrode layer 30 and a second electrode layer 31, the first electrode layer 30 is located on the side of the color filter layer 4 away from the light refraction layer, and the second electrode layer 31 is located on the light refraction layer ( Figure 11 The first and second electrode layers (not labeled) are located near the color conversion layer 1. Of course, the first and second electrode layers can be located elsewhere, and this is not a limitation here. By applying an electric field to the first refractive portion using the first and second electrodes, the refractive index of the first refractive portion changes, thereby altering the light output direction. This improves light conversion efficiency while also regulating the light output direction.

[0092] Optionally, to ensure the flatness of the front film layer in subsequent processes, refer to Figure 3-13 As shown, the light refraction layer further includes a plurality of second light refraction units 23 , and the second light refraction unit 23 is located between two adjacent first light refraction units 21 .

[0093] refer to Figure 3-13 As shown, the second light refraction unit 23 has a uniform thickness along the CD direction.

[0094] Optionally, the material of the second light refraction unit includes a material having a first refractive index; or, the material of the second light refraction unit includes a material having a second refractive index; or, the material of the second light refraction unit is the same as the material of the sub-pixel defining structure.

[0095] by Figure 3-13 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 3 、 Figure 6-13 As shown, the material of the second light refraction unit includes a material having a second refractive index. At this time, the second refraction portion 222 and the second light refraction unit 23 can be an integrated structure formed by a single process. In order to facilitate the distinction between the second refraction portion 222 and the second light refraction unit 23, Figure 3 、 Figure 6-13 The two are separated by a dotted line, which does not exist in the actual product. Figure 5 As shown, the material of the second light refraction unit 23 is the same as that of the sub-pixel defining structure 5. At this time, the second refraction portion 222 and the sub-pixel defining structure 5 can be an integrated structure formed by a single process. In order to facilitate the distinction between the second refraction portion 222 and the sub-pixel defining structure 5, Figure 5 The two are separated by a dotted line in the figure, but this dotted line does not exist in the actual product.

[0096] Optionally, the second light refraction unit includes a first material sublayer and a second material sublayer stacked together, the first material sublayer includes a material having a first refractive index, and the second material sublayer includes a material having a second refractive index.

[0097] by Figure 4 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 4 As shown, the second light refraction unit 23 includes a first material sublayer 231 and a second material sublayer 232 stacked together; the material of the first material sublayer 231 includes a material having a first refractive index. At this time, the first material sublayer 231 and the first refractive portion 221 can be an integral structure formed by a single process. In order to facilitate the distinction between the first material sublayer 231 and the first refractive portion 221, Figure 4 The two are separated by a dotted line, which does not exist in the actual product; the material of the second material sublayer 232 includes a material having a second refractive index. At this time, the second material sublayer 232 and the second refractive portion 222 can be an integral structure formed by a single process. In order to facilitate the distinction between the second material sublayer 232 and the second refractive portion 222, Figure 4 The two are separated by a dotted line in the figure, but this dotted line does not exist in the actual product.

[0098] Optional, reference Figure 1-13 As shown, the color conversion layer 1 further includes a plurality of second color conversion units 3; the second color conversion unit 3 is located between two adjacent sub-pixel defining structures 5 and is configured not to change the wavelength of the incident initial wavelength light; the orthographic projections of the plurality of second color conversion units on the substrate and the orthographic projections of the color filter layer on the substrate do not overlap with each other; Figure 3-13 As shown, the light refraction layer further includes a plurality of third light refraction units 24, and the orthographic projections of the third light refraction units on the substrate at least partially overlap with the orthographic projections of the second color conversion units on the substrate.

[0099] The above-mentioned second color conversion unit may include a transparent unit, which may be transparent to the incident light and does not undergo wavelength conversion. For example, if the initial wavelength band light is blue light, the blue light can pass through the transparent unit, but does not undergo wavelength conversion and can be directly used for blue display. Preferably, the transparent unit may be a light diffusion unit, for example, containing scattering particles, so that the incident light is scattered without changing the wavelength, which is conducive to uniform display. The light diffusion unit can be made of a light diffusion resin or a transparent resin with light diffusion ability, so that the blue light is more uniform after passing through it. In this application, transparency means allowing light to be transmitted without wavelength conversion when the angle is changed. Of course, the above-mentioned second color conversion unit can also modulate the depth of the color of the incident light. For example, if the incident light is dark blue, it will be converted into light blue after modulation by the second color conversion unit.

[0100] The orthographic projection of the third light refraction unit on the substrate at least partially overlaps with the orthographic projection of the second color conversion unit on the substrate, including the orthographic projection of the third light refraction unit on the substrate partially overlapping or completely overlapping with the orthographic projection of the second color conversion unit on the substrate. The drawings of the embodiments of the present application are all illustrated using the latter as an example.

[0101] The specific structure of the third light refraction unit is not limited here. In order to reduce the difficulty of manufacturing, optionally, the material of the third light refraction unit is the same as that of the second color conversion unit.

[0102] by Figure 5 The positional relationship between the first refraction portion 221 and the second refraction portion 22 is described as an example. Figure 5 As shown, the third light refraction unit 24 and the second color conversion unit 3 can be an integrated structure and can be formed by using the same material through a single process; in order to facilitate the distinction between the third light refraction unit 24 and the second color conversion unit 3, Figure 5 The two are separated by a dotted line in the figure, but this dotted line does not exist in the actual product.

[0103] Optional, in order to reduce the difficulty of production and simplify the process, refer to Figure 8-11 As shown, the structure of the third light refraction unit 24 is the same as that of the first light refraction unit 21. At this time, the structure of the third light refraction unit can refer to the structure of the first light refraction unit described above, which will not be repeated here; or, refer to Figure 3 As shown, the third light refraction unit 24 has the same structure as the second light refraction unit 23. At this time, the structure of the third light refraction unit can refer to the structural description of the second light refraction unit, which will not be repeated here.

[0104] Of course, reference Figure 3-13As shown, the light refraction layer may further include a plurality of fourth light refraction units 25, the fourth light refraction units 25 being located between the first light refraction units 21 and the third light refraction units 24; the structure of the fourth light refraction units may be the same as that of the second light refraction units 23. For example, the material of the fourth light refraction units includes a material having a first refractive index; or, referring to Figure 3 、 Figure 6-13 As shown, the material of the fourth light refraction unit 25 includes a material having a second refractive index; or, referring to Figure 5 As shown, the material of the fourth light refraction unit 25 is the same as that of the sub-pixel defining structure 5. Figure 4 As shown, the fourth light refraction unit includes a stacked material sublayer 251 and a material sublayer 252. The material of the material sublayer 251 includes a material having a first refractive index. At this time, the material sublayer 251 and the first refraction portion 221 can be an integral structure formed by a single process. In order to facilitate the distinction between the material sublayer 251 and the first refraction portion 221, Figure 4 The two are separated by a dotted line, which does not exist in the actual product; the material sub-layer 252 includes a material having a second refractive index. In this case, the material sub-layer 252 and the second refractive portion 222 can be an integral structure formed by a single process. In order to facilitate the distinction between the material sub-layer 252 and the second refractive portion 222, Figure 4 The two are separated by a dotted line in the figure, but this dotted line does not exist in the actual product.

[0105] It should be noted that, in order to distinguish the fourth light refraction unit from the third light refraction unit, Figure 3 、 Figure 6-13 The two are separated by a dotted line in the figure, but this dotted line does not exist in the actual product.

[0106] in addition, Figure 1-10 13-15, the light paths are illustrated by taking the case where the refractive index of the first refractive portion 221 is greater than the refractive index of the second refractive portion 222 (ie, the first refractive index is greater than the second refractive index) as an example; Figure 12 The light path is illustrated by taking an example where the refractive index of the first refractive portion 221 is smaller than the refractive index of the second refractive portion 222 (ie, the first refractive index is smaller than the second refractive index).

[0107] refer to Figure 2-13 As shown, the display substrate also includes a color filter layer ( Figure 2-13 The color filter layer is located between the color filter layer 4 and the substrate 20. The color filter layer includes a plurality of color filter units 13. The color filter units 13 are configured to transmit target wavelength light emitted by the color filter unit and absorb non-target wavelength light.

[0108] The color filter unit can be a red color filter unit that transmits red light and absorbs light of other wavelengths; or a green color filter unit that transmits green light and absorbs light of other wavelengths; or a blue color filter unit that transmits blue light and absorbs light of other wavelengths. To achieve color display, the multiple color filter units can include red, green, and blue color filter units.

[0109] It should be noted that if the multiple first color conversion units are divided into red conversion units and green conversion units, and the multiple second color conversion units are blue conversion units, then the red conversion unit corresponds to the red color filter unit, the green conversion unit corresponds to the green color filter unit, and the blue conversion unit corresponds to the blue color filter unit.

[0110] The embodiment of the present application also provides a display panel, including the above-mentioned display substrate. The display panel can be a rigid display panel or a flexible display panel (i.e., bendable and foldable), which is not limited here. At the same time, its type can be a TN (Twisted Nematic) type, VA (Vertical Alignment) type, IPS (In-Plane Switching) type or ADS (Advanced Super Dimension Switch) type liquid crystal display panel, or an OLED (Organic Light-Emitting Diode) display panel, or a Micro LED micro display panel or a Mini LED micro display panel, as well as any product or component with a display function such as a TV, digital camera, mobile phone, tablet computer, etc. that includes the display panel. The display panel has high light conversion efficiency and good display effect.

[0111] Optional, reference Figure 14 and Figure 15 As shown, the display panel further includes a plurality of light emitting units 6 ; the light emitting units 6 are disposed on the light incident side of the color conversion layer 1 of the display substrate and are configured to emit light in an initial wavelength band.

[0112] The arrangement of the plurality of light-emitting units is not limited. For example, the plurality of light-emitting units can be arranged in an array. The plurality of light-emitting units emit light of the same wavelength band. The wavelength of the initial wavelength band is not limited. For example, the initial wavelength band can be blue light, green light, or red light, etc. Blue light is generally selected in current QD-OLED display panels.

[0113] The structure of the above-mentioned light-emitting unit is not limited. For example, the light-emitting unit may include a light-emitting layer. The material of the light-emitting layer is not limited here and may be an organic light-emitting material or a quantum dot material. To improve the luminous efficiency, the light-emitting unit may also include an electron transport layer and a hole transport layer located on both sides of the light-emitting layer. To further improve the injection efficiency of electrons and holes, the light-emitting unit may also include an electron injection layer located on the side of the electron transport layer away from the light-emitting layer, and a hole injection layer located on the side of the hole transport layer away from the light-emitting layer. The light-emitting unit may emit blue light, or may also emit UV light, etc., without limitation here.

[0114] It should be noted that if the initial wavelength band light emitted by the light emitting unit is blue light, the blue light can be excited by the blue OLED light source. When the blue light is not converted into light of other wavelength bands, it propagates in a direction perpendicular or approximately perpendicular to the substrate.

[0115] The display panel provided in the embodiment of the present application can be manufactured by using an On-EL process or a cell-to-cell process. If the display panel is manufactured by using an On-EL process, the light emitting unit 6, the color conversion layer 1, the light refraction layer 2, the color filter layer 4, the color filter layer (including the color filter unit 13) and the packaging film 101 are sequentially manufactured on the substrate to form a display panel. Figure 14 The display panel shown. Of course, refer to Figure 14 As shown, the display panel also includes a first pixel defining layer 106, which includes multiple openings, and the light-emitting unit 6 is arranged in the opening; the display panel also includes a first encapsulation layer 103, a reflective polarizer 102, a reflective electrode 105, a thin film transistor 104 and an encapsulation film 101; the flat film 11 can also play a packaging role. The flat film 11 can be prepared by ultra-low temperature process (≤100°C) to form low-stress, dense inorganic thin films such as SiOx, SiNx, Al2O3 thin films, etc., specifically using CVD, ALD and other processes. The film thickness of the flat film 102 is less than 1um, preferably less than 0.5um, and the refractive index ranges from 1.7 to 2.0, preferably from 1.75 to 1.85; it is used to protect the first color conversion unit 21 and maintain the wavelength conversion optical efficiency.

[0116] If the display panel is made by the cell-matching process, that is, the light-emitting unit is made on the first substrate to form the first substrate, and the color filter layer, light refraction layer and color conversion layer are sequentially made on the second substrate to form the second substrate, and then the first substrate and the second substrate are matched to form a cell-matching process. Figure 15 The display panel is shown. Of course, reference Figure 15As shown, the display panel includes a first substrate 200, and a reflective electrode 105, a thin film transistor 104, a light-emitting unit 6, a first pixel defining layer 106, and a first encapsulation layer 203 disposed on the first substrate 200. The display panel also includes a second substrate 201, and a black matrix 12, a color filter layer (including a color filter unit 13), a flat film 11, and a spacer 204 disposed on the second substrate 201; the display panel also includes a first filling layer 204, a second filling layer 205, and a dam 206. Among them, the flat film 11 can also play a packaging role. The flat film 11 can be prepared by ultra-low temperature process (≤100°C) to form low-stress, dense inorganic thin films, such as SiOx, SiNx, Al2O3 thin films, etc., specifically using CVD, ALD and other processes. The flat film 102 has a thickness less than 1 μm, preferably less than 0.5 μm, and a refractive index ranging from 1.7 to 2.0, preferably from 1.75 to 1.85. The flat film 102 is used to protect the first color conversion unit 21 and maintain wavelength conversion optical efficiency.

[0117] It should be noted that Figure 14 and Figure 15 The display panels include Figure 6 The display substrate shown is illustrated as an example.

[0118] The above are only specific embodiments of the present application, but the scope of protection of this 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, characterized in that: include: substrate; a color conversion layer located on one side of the substrate, the color conversion layer comprising a plurality of sub-pixel defining structures and a plurality of first color conversion units; the first color conversion unit being located between two adjacent sub-pixel defining structures and configured to convert incident light of an initial wavelength band into light of a target wavelength band; a color filter layer located between the color conversion layer and the substrate, the color filter layer comprising a plurality of color filter units, the color filter units being configured to transmit the target wavelength band light emitted by the first color conversion unit and reflect the initial wavelength band light; a light refraction layer located between the color filter layer and the color conversion layer, the light refraction layer comprising a plurality of first light refraction units, the first light refraction units comprising at least two material portions having different refractive indices in a thickness direction, and an orthographic projection of the first light refraction units on the substrate at least partially overlapping with an orthographic projection of the first color conversion unit on the substrate; The first light refraction unit includes a first refraction portion and a second refraction portion, the material of the first refraction portion includes a material having a first refractive index, and the material of the second refraction portion includes a material having a second refractive index, and the first refractive index and the second refractive index are different; the target wavelength band light emitted by the first color conversion unit has its optical path changed after passing through the first light refraction unit, and can enter the color filter layer at an incident angle α, where α is an acute angle, so that the initial wavelength band light reflected by the color filter layer can re-enter the color conversion layer in a direction non-perpendicular to the color filter layer, thereby increasing the optical path of the initial wavelength band light reflected by the color filter layer in the color conversion layer, so that more of the initial wavelength band light is converted into the target wavelength band light.

2. The display substrate according to claim 1, wherein: The first light refraction unit has a uniform thickness.

3. The display substrate according to claim 2, wherein: Each cross-sectional area of ​​one of the first refractive portion and the second refractive portion along a direction parallel to a plane where the substrate is located increases along a first direction, where the first direction is a direction from close to the substrate to far away from the substrate.

4. The display substrate according to claim 3, wherein: The thickness of the first refractive portion decreases along a second direction, and the thickness of the second refractive portion increases along the second direction. The second direction is parallel to a direction of a plane where the substrate is located.

5. The display substrate according to claim 4, wherein: The thickness of the first refractive portion decreases linearly along the second direction, and the thickness of the second refractive portion increases linearly along the second direction.

6. The display substrate according to claim 3, wherein: The thickness of one of the first refractive portion and the second refractive portion first increases and then decreases along a second direction, and the second direction is parallel to a direction of a plane where the substrate is located.

7. The display substrate according to claim 3, wherein: The first refractive portion includes a plurality of protrusions arranged along a second direction, the second refractive portion includes a plurality of grooves arranged along the second direction, the protrusions and the grooves match, and the first direction is parallel to the direction of the plane where the substrate is located.

8. The display substrate according to claim 1, wherein: The refractive index of either the first refractive portion or the second refractive portion may be variable.

9. The display substrate according to claim 8, wherein: The display substrate further includes a first electrode layer and a second electrode layer. The first electrode layer is located on a side of the color filter layer away from the light refraction layer, and the second electrode layer is located on a side of the light refraction layer close to the color conversion layer.

10. The display substrate according to any one of claims 1 to 9, characterized in that: The light refraction layer further includes a plurality of second light refraction units, and the second light refraction units are located between two adjacent first light refraction units.

11. The display substrate according to claim 10, wherein: The material of the second light refraction unit includes a material having the first refractive index; Alternatively, the material of the second light refraction unit includes a material having the second refractive index; Alternatively, the material of the second light refraction unit is the same as the material of the sub-pixel defining structure.

12. The display substrate according to claim 10, wherein: The second light refraction unit includes a first material sublayer and a second material sublayer stacked together. The first material sublayer includes a material having the first refractive index, and the second material sublayer includes a material having the second refractive index.

13. The display substrate according to claim 10, wherein: The color conversion layer further includes a plurality of second color conversion units; the second color conversion units are located between two adjacent sub-pixel defining structures and are configured not to change the wavelength band of the incident initial wavelength band light; The orthographic projections of the plurality of second color conversion units on the substrate and the orthographic projections of the color filter layer on the substrate do not overlap with each other; The light refraction layer further includes a plurality of third light refraction units, and orthographic projections of the third light refraction units on the substrate at least partially overlap with orthographic projections of the second color conversion units on the substrate.

14. The display substrate according to claim 13, wherein: The material of the third light refraction unit is the same as that of the second color conversion unit.

15. The display substrate according to claim 1, wherein The display substrate further includes a color filter layer, which is located between the color filter layer and the substrate. The color filter layer includes a plurality of color filter units, which are configured to transmit the target band light emitted by the color filter unit and absorb non-target band light.

16. A display panel, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 15.

17. The display panel according to claim 16, wherein: The display panel further includes a plurality of light emitting units; The light emitting unit is disposed on the light incident side of the color conversion layer of the display substrate and is configured to emit light in an initial wavelength band.

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