Display substrate, display panel, and method for preparing display substrate

Abstract

The embodiments of the present application provide a display substrate, a display panel, and a method for preparing a display substrate, belonging to the field of display substrate technology, and comprising: a substrate having multiple light-emitting areas; a defining layer, the defining layer being located on a side of the light-emitting device away from the substrate and defining multiple light-emitting areas; a reflective layer, the reflective layer covering the defining layer and the substrate of the light-emitting areas, the reflective layer having a light-transmitting area at the light-emitting area of ​​the substrate; a quantum dot layer, the reflective layer filling the light-emitting area and covering the light-emitting area, comprising a first quantum dot layer and a second quantum dot layer stacked; and a translucent and semi-reflective layer located between the first quantum dot layer and the second quantum dot layer, the orthographic projection of the translucent and semi-reflective layer on the reflective layer covering the light-transmitting area. The display substrate, display panel, and method for preparing a display substrate provided by the embodiments of the present application can reduce the occurrence of blue light penetrating the display substrate.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of display substrates, and more specifically, to a display substrate, a display panel, and a method for manufacturing a display substrate. Background Art

[0002] Quantum dots (QDs) are semiconductor nanostructures that confine excitons in three spatial dimensions. Within a QD, energy levels vary depending on its size, allowing the band gap and, consequently, the emission spectrum to be controlled by varying the size of the QD. When illuminated by an external light source, such as a light-emitting diode (LED), the QD shell emits high-brightness, pure-color light, with luminescence properties far exceeding those of the phosphors used in LED backlights.

[0003] Installing a display substrate made of quantum dot material on a display device can improve the display quality of the display device.

[0004] Typically, quantum dot displays use blue light or shorter-wavelength ultraviolet light as their excitation light source. However, since it's difficult for any material to absorb 100% of light, some blue light will penetrate the display substrate. This penetrating blue light can reduce the color gamut of the display product, impacting the display quality. Summary of the Invention

[0005] Embodiments of the present application provide a display substrate, a display panel, and a method for manufacturing a display substrate, aiming to reduce the occurrence of blue light penetrating the display substrate.

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

[0007] substrate;

[0008] a plurality of light-emitting devices, located on the substrate and defining a plurality of light-emitting areas;

[0009] a defining layer, the defining layer being located on a side of the light emitting device away from the substrate and defining a plurality of light emitting areas;

[0010] a reflective layer, the reflective layer covering the defining layer and the light emitting area, the reflective layer including a plurality of light-transmitting areas corresponding one-to-one to the plurality of light-emitting areas;

[0011] a quantum dot layer, located in at least one of the light exiting areas and covering the reflective layer of the light exiting area, comprising a first quantum dot layer and a second quantum dot layer stacked;

[0012] The semi-transmissive and semi-reflective layer is located between the first quantum dot layer and the second quantum dot layer, and the orthographic projection of the semi-transmissive and semi-reflective layer on the substrate covers the light-transmitting area.

[0013] Optionally, a protective layer covers the reflective layer on the defining layer and the quantum dot layer;

[0014] an optical adjustment layer covering the protective layer;

[0015] The lens layer covers the optical adjustment layer.

[0016] Optionally, the orthographic projection of the light emitting area on the substrate covers the light emitting area, and the orthographic projection of the light transmitting area on the substrate is located within the light emitting area.

[0017] Optionally, the first quantum dot layer is disposed close to the substrate, and the quantum dot concentration of the first quantum dot layer is greater than the quantum dot concentration of the second quantum dot layer.

[0018] Optionally, the scattering particle concentration of the first quantum dot layer is less than the scattering particle concentration of the second quantum dot layer.

[0019] Optionally, the thickness of the first quantum dot layer is greater than the thickness of the second quantum dot layer.

[0020] Optionally, the material of the defining layer is black photoresist.

[0021] Optionally, the material of the semi-transmissive and semi-reflective layer is nanosilver or an atomizable material containing scattering particles.

[0022] Optionally, the refractive index of the protective layer is greater than the refractive index of the optical adjustment layer.

[0023] Optionally, the refractive index of the lens layer is greater than the refractive index of the optical adjustment layer.

[0024] A second aspect of an embodiment of the present application provides a display panel, comprising a display substrate as provided in the first aspect of the embodiment of the present application, and a driving circuit and a driving control circuit arranged on the display substrate, the driving control circuit being electrically connected to the driving circuit, and the driving control circuit being used to output a control signal to the driving circuit so that the display substrate displays an image.

[0025] A third aspect of the present application provides a method for preparing a display substrate, the method comprising:

[0026] providing a substrate;

[0027] forming the defining layer on the light emitting side of the substrate, wherein the defining layer divides the substrate into a plurality of light emitting areas;

[0028] forming the reflective layer on the defining layer and the light emitting area, wherein the reflective layer includes a plurality of light-transmitting areas;

[0029] forming a first quantum dot layer of the quantum dot layer on the reflective layer, wherein the first quantum dot layer is filled in the light emitting area;

[0030] forming the semi-transmissive and semi-reflective layer on the first quantum dot layer, wherein the orthographic projection of the semi-transmissive and semi-reflective layer on the substrate covers the light-transmitting area;

[0031] A second quantum dot layer of the quantum dot layer is formed on the first quantum dot layer and the semi-transmissive and semi-reflective layer, and the second quantum dot layer is filled in the light exiting area.

[0032] Optionally, the method further comprises: forming the protective layer on the reflective layer of the defining layer and the quantum dot layer;

[0033] forming the optical adjustment layer on the protective layer;

[0034] The lens layer is formed on the optical adjustment layer.

[0035] Optionally, the step of forming the semi-transmissive and semi-reflective layer includes:

[0036] After dissolving nanosilver or an atomizable material with scattering particles in a carboxyl-containing solvent material, the semi-transmissive and semi-reflective layer is formed by a printing process;

[0037] vacuum curing the semi-transmissive and semi-reflective layer;

[0038] The semi-transmissive and semi-reflective layer is semi-crystallized using short-wave UV light.

[0039] Beneficial effects:

[0040] The present application provides a display substrate, a display panel and a method for preparing a display substrate, wherein a defining layer is provided on the substrate, a reflective layer is provided on the defining layer, and a light-transmitting area is provided on the reflective layer, and at the same time, a first quantum dot layer and a second quantum dot layer are stacked and filled in a light-emitting area formed by the defining layer, and a semi-transparent and semi-reflective layer is provided between the first quantum dot layer and the second quantum dot layer; when blue light enters the light-emitting area through the light-transmitting area, part of the blue light will exchange energy with the quantum dots in the first quantum dot layer, while the blue light that has not exchanged energy will be blocked by the semi-transparent and semi-reflective layer and reflected to the reflective layer, and the reflective layer will reflect the blue light back to the first quantum dot layer and the second quantum dot layer, thereby increasing the optical path of the blue light, thereby increasing the probability of the blue light exchanging energy with the quantum dots in the quantum dot layer, and at the same time reducing the occurrence of the blue light directly penetrating the light-emitting area, thereby improving the display effect of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. 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.

[0042] Figure 1 is a schematic cross-sectional structural diagram of a display substrate proposed in one embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of a partial cross-sectional structure of a display substrate proposed in one embodiment of the present application;

[0044] Figure 3 This is a schematic diagram of a light path of light passing through a display substrate proposed in one embodiment of the present application;

[0045] Figure 4 This is a schematic structural diagram of a display panel proposed in one embodiment of the present application;

[0046] Figure 5 yes Figure 4 Schematic diagram of the structure of the A-A' section;

[0047] Figure 6 This is a schematic diagram of a pixel structure of a display panel proposed in one embodiment of the present application;

[0048] Figure 7 is a flowchart of the steps of a method for preparing a display substrate proposed in one embodiment of the present application;

[0049] Figure 8 1 is a schematic cross-sectional view of a display substrate fabricated in accordance with an embodiment of the present invention;

[0050] Figure 9 This is a schematic cross-sectional view of a display substrate after the definition layer is fabricated according to an embodiment of the present application;

[0051] Figure 10 This is a schematic cross-sectional view of a display substrate having a reflective layer fabricated thereon according to an embodiment of the present application;

[0052] Figure 11 This is a schematic cross-sectional view of a display substrate in which a light-transmitting area on a reflective layer is fabricated according to an embodiment of the present application;

[0053] Figure 12 This is a schematic cross-sectional view of a display substrate after the first quantum dot layer is fabricated according to an embodiment of the present application;

[0054] Figure 13 This is a schematic cross-sectional view of a display substrate having a transflective layer fabricated thereon according to an embodiment of the present application;

[0055] Figure 14 This is a schematic cross-sectional view of a display substrate after the second quantum dot layer is fabricated according to an embodiment of the present application;

[0056] Figure 15 This is a schematic cross-sectional view of a display substrate having a protective layer fabricated thereon according to an embodiment of the present application;

[0057] Figure 16 This is a schematic cross-sectional view of a display substrate having an optical adjustment layer fabricated thereon according to an embodiment of the present application;

[0058] Figure 17 1 is a schematic cross-sectional view of a display substrate after the lens layer is fabricated according to an embodiment of the present application.

[0059] Explanation of the accompanying drawings: 100, substrate; 101, light-emitting device; 102, TFT layer; 103, encapsulation layer; 11, definition layer; 12, reflective layer; 13, quantum dot layer; 131, first quantum dot layer; 132, second quantum dot layer; 14, semi-transparent and semi-reflective layer; 15, protective layer; 16, optical adjustment layer; 17, lens layer; 200, display panel; LA, light-emitting area; EA, light-emitting area; TA, light-transmitting area. DETAILED DESCRIPTION

[0060] 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 part of the embodiments of this application, not all of them. 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.

[0061] Reference Figure 1 As shown, a display substrate disclosed in an embodiment of the present application includes, from the bottom layer to the top layer, a substrate 100, a defining layer 11, and a reflective layer 12 covering the defining layer 11, a quantum dot layer 13 covering the reflective layer 12, the quantum dot layer 13 includes a first quantum dot layer 131 and a second quantum dot layer 132 stacked together, and a semi-transparent and semi-reflective layer 14 located between the first quantum dot layer 131 and the second quantum dot layer 132.

[0062] Specifically, refer to Figure 2 and Figure 6 As shown, the substrate 100 may be a TFT array substrate, wherein the substrate 100 is covered with a TFT layer 102, and a plurality of light emitting devices 101 (in Figure 2 Only one is shown in the figure), and a plurality of light emitting devices 101 define a plurality of light emitting areas LA on the substrate 100, and the light emitting devices 101 are covered with an encapsulation layer 103.

[0063] The defining layer 11 is located on the light-emitting side of the substrate 100 and divides the substrate 100 into a plurality of light-emitting areas EA. The plurality of light-emitting areas EA correspond one-to-one to the plurality of luminous areas LA, and the orthographic projection of the light-emitting area on the substrate 100 covers the luminous area LA, so that all light emitted from the luminous area LA of the substrate 100 enters the light-emitting area EA. The defining layer 11 is made of black photoresist. In this way, when blue light penetrates the reflective layer 12, the black defining layer 11 can absorb the blue light, thereby reducing the occurrence of blue light side leakage and optical interference. For example, the thickness of the defining layer 11 is 10μm-15μm.

[0064] The defining layer 11 may also be made of epoxy resin material and dyed by mixing black dye into the epoxy resin material.

[0065] Reference Figure 2 and Figure 6 As shown, reflective layer 12 covers the defining layer 11 and substrate 100 within light-emitting area EA. Reflective layer 12 reflects light and includes multiple light-transmitting areas TA, which correspond one-to-one with the multiple light-emitting areas LA. The orthographic projections of light-transmitting areas TA on substrate 100 are located within light-emitting area LA. This allows excitation light emitted from light-emitting area LA of substrate 100 to enter light-emitting area EA through light-transmitting areas TA. To ensure sufficient light output, the area of ​​light-transmitting areas TA accounts for 50%-70% of the area of ​​a single pixel in light-emitting area LA.

[0066] The material of the reflective layer 12 can be metal, such as silver or a laminated structure of aluminum / titanium / aluminum; when silver is selected, the thickness of the reflective layer 12 is set to When the aluminum / titanium / aluminum laminated structure is selected, the thickness of the reflective layer 12 is

[0067] Reference Figure 1 As shown, the quantum dot layer 13 is filled in the light emitting area EA, and the quantum dot layer 13 includes a first quantum dot layer 131 and a second quantum dot layer 132 .

[0068] The first quantum dot layer 131 covers the surface of the reflective layer 12 and is arranged close to the substrate 100. The first quantum dot layer 131 uses acrylic resin material as the main polymer material. The thickness of the first quantum dot layer 131 is 5μm-8μm, thereby ensuring that most of the blue light will participate in the excitation process of the first quantum dot layer 131 within the first quantum dot layer 131.

[0069] The second quantum dot layer 132 covers the first quantum dot layer 131 and the transflective layer 14, and is completely located within the light-emitting area EA. The second quantum dot layer 132 is also primarily polymerized using an acrylic resin. The thickness of the second quantum dot layer 132 is less than that of the first quantum dot layer 131, and is between 2 μm and 5 μm.

[0070] At the same time, in order to ensure that there are enough quantum dots to participate in the excitation of luminescence and reduce blue light penetration, the quantum dot concentration of the first quantum dot layer 131 is greater than the quantum dot concentration of the second quantum dot layer 132, and the scattering particle concentration of the first quantum dot layer 131 is less than the scattering particle concentration of the second quantum dot layer 132.

[0071] Specifically, the quantum dot concentration of the first quantum dot layer 131 is controlled at 30%-40%, and the scattering particle concentration is controlled at 15%-20%. The quantum dot concentration of the second quantum dot layer 132 is controlled at 15%-20%, and the scattering particle concentration is controlled at 30%-40%.

[0072] In this way, most of the blue light will participate in the excitation of luminescence in the first quantum dot layer 131, and the second quantum dot layer 132 can scatter the light passing through the first quantum dot layer 131 and the semi-transparent and semi-reflective layer 14 when it is excited to emit light again, thereby reducing the situation where blue light directly penetrates the quantum dot layer 13.

[0073] Reference Figure 1 As shown, the semi-transparent and semi-reflective layer 14 is located between the first quantum dot layer 131 and the second quantum dot layer 132. The orthographic projection of the semi-transparent and semi-reflective layer 14 on the reflective layer 12 covers the light-transmitting area TA, and the area of ​​the semi-transparent and semi-reflective layer 14 is smaller than the area of ​​the first quantum dot layer 131 and larger than the area of ​​the light-transmitting area TA. In this way, all the blue light passing through the light-transmitting area TA can be irradiated onto the semi-transparent and semi-reflective layer 14.

[0074] The semi-transmissive and semi-reflective layer 14 can transmit light and also reflect light. In order to achieve such an effect, the material of the semi-transmissive and semi-reflective layer 14 can be nano silver or an atomizable material containing scattering particles.

[0075] In this embodiment, the material of the semi-transmissive and semi-reflective layer 14 is nano-silver.

[0076] Reference Figure 3 As shown, in this embodiment, after the blue light emitted by the light emitting area LA passes through the light transmitting area TA and enters the light emitting area EA, the optical path of the blue light mainly includes the following situations:

[0077] 1. After the vertically directed blue light enters the first quantum dot layer 131 from the light-transmitting area TA, it exchanges energy with the quantum dots in the first quantum dot layer 131, causing the quantum dots in the first quantum dot layer 131 to excite and emit light. The blue light that does not participate in the energy exchange will be blocked by the semi-transparent and semi-reflective layer 14, thereby reducing the occurrence of blue light penetration. Even if some of the blue light passes through the semi-transparent and semi-reflective layer 14 and enters the second quantum dot layer 132, in the second quantum dot layer 132, due to the high concentration of scattering particles in the second quantum dot layer 132, the blue light will be scattered more in the second quantum dot layer 132, thereby reducing the penetration of the blue light in another aspect.

[0078] 2. After the blue light at a certain angle passes through the light-transmitting area TA, this part of the blue light will irradiate the reflective layer 12 and be reflected by the reflective layer 12 into the first quantum dot layer 131. Then, the blue light will exchange energy with the quantum dots in the first quantum dot layer 131 in the first quantum dot layer 131, so that this part of the blue light will not directly penetrate the quantum dot layer 13, further reducing the penetration of the blue light.

[0079] 3. In the first case, the blue light blocked by the semi-transparent and semi-reflective layer 14 will be reflected onto the reflective layer 12, and then reflected by the reflective layer 12 into the first quantum dot layer 131, thereby increasing the optical path of this part of the blue light in the first quantum dot layer 131, thereby increasing the probability of energy exchange between the blue light and the quantum dots, and at the same time, reducing the penetration of the blue light.

[0080] In this way, the arrangement of the reflective layer 12, the first quantum dot layer 131, the semi-transmissive and semi-reflective layer 14 and the second quantum dot layer 132 increases the optical path of the blue light when it passes through the light-emitting area EA, so that the quantum dots in the first quantum dot layer 131 and the second quantum dot layer 132 can more effectively participate in the excitation of luminescence, while also reducing the situation where the blue light directly penetrates the quantum dot layer 13, so that the blue light can be more effectively utilized.

[0081] Reference Figure 17 As shown, in one embodiment, in order to further reduce the penetration of blue light and improve the luminous effect, the display substrate further includes a protective layer 15 , an optical adjustment layer 16 and a lens layer 17 .

[0082] Specifically, the protective layer 15 covers the reflective layer 12 on the defining layer 11 and the quantum dot layer 13 . The protective layer 15 completely covers the light emitting area EA, thereby forming a protective effect on the entire display substrate.

[0083] The protective layer 15 is made of inorganic material such as Al2O3, SiN x Or SiO2, the thickness of the protective layer 15 is 300nm-1000nm, and the refractive index of the protective layer 15 is controlled at about 1.7, which can ensure the luminous effect of the display substrate.

[0084] The optical adjustment layer 16 is made of an organic material with a low refractive index, such as acrylic or epoxy resin. The refractive index of the optical adjustment layer 16 is lower than that of the protective layer 15 and is controlled within a range of 1.3-1.5. This allows the optical adjustment layer 16 to reflect wide-angle light and short-wavelength blue light, thereby reducing blue light penetration.

[0085] The lens layer 17 is made of a material similar to that of the optical adjustment layer 16 , but the refractive index of the lens layer 17 is higher than that of the optical adjustment layer 16 , so that the lens layer 17 can extract the light excited by the first quantum dot layer 131 and the second quantum dot layer 132 , thereby increasing the light emission rate and improving the luminous effect.

[0086] Example 2

[0087] Based on the same inventive concept, an embodiment of the present application provides a display panel, including the display substrate provided in the first embodiment of the present application.

[0088] Specifically, Figure 4 and Figure 5 The overall structure of the display panel 200 is shown schematically.

[0089] In addition, the display panel 200 also includes a driving circuit (not shown in the figure) arranged on the display substrate. The display panel 200 may also include a driving control circuit (not shown in the figure) bound to the display substrate. The driving control circuit is electrically connected to the driving circuit to output a control signal to the driving circuit to control each pixel on the display substrate to emit light and display an image.

[0090] The display panel 200 may further include a flexible circuit board, a packaging cover, and the like.

[0091] The display panel 200 is used to display an image (i.e., a picture). The display panel can be a flexible display panel or a conventional display panel (also known as a rigid display). Examples of products incorporating the display panel include computer monitors, televisions, billboards, laser printers with display functions, telephones, mobile phones, personal digital assistants (PDAs), laptop computers, digital cameras, camcorders, viewfinders, vehicles, large-area walls, theater screens, or stadium signs.

[0092] Example 3

[0093] Figure 7 This is a flow chart of the steps of the method for preparing a display substrate according to one embodiment of the present application. Figure 7As shown, an embodiment of the present application provides a method for preparing a display substrate, which is applied to the display substrate described in any of the above embodiments, and the method includes:

[0094] Step 301: Provide a substrate 100.

[0095] Specifically, the step of providing the substrate 100 may include completing the production of the substrate 100, the TFT layer 102, the light emitting device 101 and the encapsulation layer 103, such as Figure 8 shown.

[0096] Step 302 : forming a defining layer 11 on the light emitting side of the substrate 100 , wherein the defining layer 11 divides the substrate 100 into a plurality of light emitting areas EA.

[0097] Specifically, the defining layer 11 is obtained by a coating process, an exposure process, and a baking process. The thickness of the defining layer 11 is 10 μm-15 μm. In order to take into account the temperature resistance of the organic electroluminescent layer and the quantum dot layer 13 on the substrate 100, the process temperature of the defining layer 11 is controlled between 80 and 110 degrees. Figure 9 shown.

[0098] Step 303 : forming a reflective layer 12 on the defining layer 11 and the light emitting area EA, wherein the reflective layer includes a plurality of light-transmitting areas TA.

[0099] Specifically, the reflective layer 12 is made of silver and is formed on the defining layer 11 by a sputtering process. The thickness of the reflective layer 12 is Then, a light-transmitting area TA is formed on the reflective layer 12 through an etching process. The orthographic projection of the light-transmitting area TA on the substrate 100 is located within the light-emitting area LA. Figure 10 and Figure 11 shown.

[0100] Step 304 : forming a first quantum dot layer 131 of the quantum dot layer 13 on the reflective layer 12 , wherein the first quantum dot layer 131 is filled in the light emitting area EA.

[0101] Specifically, a first quantum dot layer 131 is formed on the reflective layer 12 by a printing process and then UV-cured. The first quantum dot layer 131 is made of an acrylic resin material. The thickness of the first quantum dot layer 131 is 5 μm-8 μm. The quantum dot concentration of the first quantum dot layer 131 is controlled at 30%-40%, and the scattering particle concentration is controlled at 15%-20%. Figure 12 shown.

[0102] Step 305 : forming a transflective layer 14 on the first quantum dot layer 131 , wherein the orthographic projection of the transflective layer 14 on the reflective layer 12 covers the light-transmitting area TA.

[0103] Specifically, the semi-transmissive and semi-reflective layer 14 is made of nano-silver or an atomizable material containing scattering particles. After the nano-silver or the atomizable material containing scattering particles is dissolved in a carboxyl-containing solvent material, the semi-transmissive and semi-reflective layer 14 is formed on the first quantum dot layer 131 through a printing process, and then vacuum-cured using a vacuum device, and then semi-crystallized using short-wave UV light, such as Figure 13 shown.

[0104] The carboxyl-containing solvent material will not be miscible with the first quantum dot layer 131 and has strong liquid-phobicity. After printing, the ink will shrink, so that after the semi-transparent and semi-reflective layer 14 is cured, the area of ​​the semi-transparent and semi-reflective layer 14 will be smaller than the area of ​​the first quantum dot layer 131. Therefore, as long as the appropriate amount of ink is selected, the required area of ​​the semi-transparent and semi-reflective layer 14 can be obtained.

[0105] Of course, the solvent material can be other materials that are orthogonal to the first quantum dot layer.

[0106] Step 306 : forming a second quantum dot layer 132 of the quantum dot layer 13 on the first quantum dot layer 131 and the semi-transmissive and semi-reflective layer 14 , and filling the light emitting area EA with the second quantum dot layer 132 .

[0107] Specifically, a second quantum dot layer 132 is formed on the first quantum dot layer 131 and the semi-transmissive and semi-reflective layer 14 by a printing process. The second quantum dot layer 132 is also made of acrylic resin material. The thickness of the second quantum dot layer 132 is 2 μm-5 μm. The quantum dot concentration in the second quantum dot layer 132 is controlled at 15%-20%, and the scattering particle concentration is controlled at 30%-40%. Figure 14 shown.

[0108] In one embodiment, to further reduce the penetration of blue light, after step 306, the method further includes:

[0109] Step 401 : forming a protective layer 15 on the reflective layer 12 and the quantum dot layer 13 of the definition layer 11 .

[0110] Specifically, the protective layer 15 is made by vapor deposition or interlayer dielectric process, and the material of the protective layer 15 is selected from Al2O3, SiN x or SiO2, the thickness of the protective layer 15 is 300nm-1000nm, such as Figure 15 shown.

[0111] Step 402 : forming an optical adjustment layer 16 on the protective layer 15 .

[0112] Specifically, the optical adjustment layer 16 is formed by inkjet printing or glue coating process, nano-imprinting, and the optical adjustment layer 16 can be made of acrylic material or epoxy resin material, such as Figure 16 shown.

[0113] Step 403 : forming a lens layer 17 on the optical adjustment layer 16 .

[0114] Specifically, the lens layer 17 is manufactured by nano-imprinting and thermal reflow process, as shown in FIG. Figure 17 shown.

[0115] The present application provides a display substrate, a display panel and a method for preparing a display substrate, wherein a defining layer is provided on the substrate, a reflective layer is provided on the defining layer, and a light-transmitting area is provided on the reflective layer, and at the same time, a first quantum dot layer and a second quantum dot layer are stacked and filled in a light-emitting area formed by the defining layer, and a semi-transparent and semi-reflective layer is provided between the first quantum dot layer and the second quantum dot layer; when blue light enters the light-emitting area through the light-transmitting area, part of the blue light will exchange energy with the quantum dots in the first quantum dot layer, while the blue light that has not exchanged energy will be blocked by the semi-transparent and semi-reflective layer and reflected to the reflective layer, and the reflective layer will reflect the blue light back to the first quantum dot layer and the second quantum dot layer, thereby increasing the optical path of the blue light, thereby increasing the probability of the blue light exchanging energy with the quantum dots in the quantum dot layer, and at the same time reducing the occurrence of the blue light directly penetrating the light-emitting area, thereby improving the display effect of the display substrate.

[0116] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0117] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device that includes the element.

[0118] The technical solutions provided by this application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of this application. The description of the above embodiments is only intended to help understand this application, and the contents of this specification should not be construed as limiting this application. At the same time, for those skilled in the art, according to this application, there may be various changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all implementation methods here, and obvious changes or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A display substrate, characterized in that: include: substrate; a plurality of light-emitting devices, located on the substrate and defining a plurality of light-emitting areas; a defining layer, the defining layer being located on a side of the light emitting device away from the substrate and defining a plurality of light emitting areas; a reflective layer, the reflective layer covering the defining layer and the light emitting area, the reflective layer including a plurality of light-transmitting areas corresponding one-to-one to the plurality of light-emitting areas; a quantum dot layer located in at least one of the light exiting areas and covering the reflective layer of the light exiting area, comprising a first quantum dot layer and a second quantum dot layer stacked; a translucent and semi-reflective layer, located between the first quantum dot layer and the second quantum dot layer, wherein the orthographic projection of the translucent and semi-reflective layer on the substrate covers the light-transmitting area, and the area of ​​the translucent and semi-reflective layer is smaller than the area of ​​the first quantum dot layer; When the reflective layer is penetrated by blue light, the defining layer absorbs the blue light.

2. The display substrate according to claim 1, wherein: a protective layer covering the reflective layer on the defining layer and the quantum dot layer; an optical adjustment layer covering the protective layer; The lens layer covers the optical adjustment layer.

3. The display substrate according to claim 1, wherein: The orthographic projection of the light emitting area on the substrate covers the light emitting area, and the orthographic projection of the light transmitting area on the substrate is located within the light emitting area.

4. The display substrate according to claim 1, wherein: The first quantum dot layer is located on a side of the second quantum dot layer close to the substrate, and a quantum dot concentration of the first quantum dot layer is greater than a quantum dot concentration of the second quantum dot layer.

5. The display substrate according to claim 4, wherein: The scattering particle concentration of the first quantum dot layer is less than the scattering particle concentration of the second quantum dot layer.

6. The display substrate according to claim 5, wherein: The thickness of the first quantum dot layer is greater than the thickness of the second quantum dot layer.

7. The display substrate according to claim 1, wherein: The material of the semi-transmissive and semi-reflective layer is nano-silver or an atomizable material containing scattering particles.

8. The display substrate according to claim 2, wherein: The refractive index of the protective layer is greater than the refractive index of the optical adjustment layer.

9. The display substrate according to claim 8, wherein: The refractive index of the lens layer is greater than the refractive index of the optical adjustment layer.

10. A display panel, characterized in that: include: A display substrate according to any one of claims 1 to 9, and a driving circuit and a driving control circuit provided on the display substrate, the driving control circuit being electrically connected to the driving circuit, the driving control circuit being configured to output a control signal to the driving circuit so that the display substrate displays an image.

11. A method for preparing a display substrate, characterized in that: The method comprises: providing a substrate; forming a defining layer on the light emitting side of the substrate, wherein the defining layer divides the substrate into a plurality of light emitting areas; forming a reflective layer on the defining layer and the light exiting area, wherein the reflective layer includes a plurality of light-transmitting areas; forming a first quantum dot layer of a quantum dot layer on the reflective layer, wherein the first quantum dot layer is filled in the light emitting area; forming a semi-transmissive and semi-reflective layer on the first quantum dot layer, wherein the orthographic projection of the semi-transmissive and semi-reflective layer on the substrate covers the light-transmitting area, and the area of ​​the semi-transmissive and semi-reflective layer is smaller than the area of ​​the first quantum dot layer; forming a second quantum dot layer of the quantum dot layer on the first quantum dot layer and the semi-transmissive and semi-reflective layer, wherein the second quantum dot layer is filled in the light emitting area; When the reflective layer is penetrated by blue light, the defining layer absorbs the blue light.

12. The method for preparing a display substrate according to claim 11, wherein: The method further comprises: forming a protective layer on the reflective layer of the defining layer and the quantum dot layer; forming an optical adjustment layer on the protective layer; A lens layer is formed on the optical adjustment layer.

13. The method for preparing a display substrate according to claim 11, wherein: The step of forming the semi-transmissive and semi-reflective layer comprises: After dissolving nanosilver or an atomizable material with scattering particles in a carboxyl-containing solvent material, the semi-transmissive and semi-reflective layer is formed by a printing process; vacuum curing the semi-transmissive and semi-reflective layer; The semi-transmissive and semi-reflective layer is semi-crystallized using short-wave UV light.

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