Color conversion substrate, preparation method thereof, and display panel

Abstract

Embodiments of the present disclosure provide a color conversion substrate, a preparation method thereof, and a display panel, relating to the field of display technologies, and being used to improve the color purity of the display of the display panel. The color conversion substrate includes a substrate, a color conversion layer, and a cholesteric liquid crystal layer. The color conversion layer is located on one side of the substrate; the color conversion layer includes a first color conversion portion; the first color conversion portion is configured to convert first color light rays incident on the first color conversion portion into second color light rays. The cholesteric liquid crystal layer includes a first cholesteric liquid crystal portion located between the substrate and the first color conversion portion; the first cholesteric liquid crystal portion is configured to reflect the light rays that have not been converted in the first color light rays back to the first color conversion portion. The above-mentioned color conversion substrate is used for color conversion.

Description

Technical Field

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

[0002] In the field of displays, the use of a color conversion substrate to achieve full-color display of a display panel has been widely applied. Specifically, the light emitted by the light-emitting substrate of the display panel is used as excitation light to excite the color conversion material in the color conversion substrate, and at least part of the excitation light is color-converted, so that the display panel emits light of colors such as red, green, and blue, thereby achieving the purpose of full-colorization. Summary of the Invention

[0003] An object of an embodiment of the present disclosure is to provide a color conversion substrate, a preparation method thereof, and a display panel, which are used to improve the color purity of the display of the display panel.

[0004] To achieve the above object, the embodiments of the present disclosure provide the following technical solutions:

[0005] On the one hand, a color conversion substrate is provided. The color conversion substrate includes a substrate, a color conversion layer, and a cholesteric liquid crystal layer. The color conversion layer is located on one side of the substrate; the color conversion layer includes a first color conversion part; the first color conversion part is configured to convert the first color light incident on the first color conversion part into second color light. The cholesteric liquid crystal layer includes a first cholesteric liquid crystal part located between the substrate and the first color conversion part; the first cholesteric liquid crystal part is configured to reflect the light that has not been converted in the first color light back to the first color conversion part.

[0006] Since the first cholesteric liquid crystal part is located between the substrate and the first color conversion part, when the material of the first cholesteric liquid crystal part includes a cholesteric liquid crystal that reflects the first color light, the first color light that passes through the first color conversion part but has not been converted can be reflected back to the first color conversion part by the first cholesteric liquid crystal part, exciting the color conversion material in the first color conversion part and being converted into second color light. In this way, first, the first color light leaking from the second sub-pixel region can be reduced, so that the color purity of the second color light emitted from the second sub-pixel region is relatively high, the color purity of the display panel can be improved, and at the same time, the leaking first color light entering the adjacent sub-pixel region can be avoided from causing crosstalk, and the color gamut can be broadened; second, the light extraction efficiency of the first color conversion part in the color conversion layer can be improved, and the external quantum efficiency of the color conversion layer can be improved.

[0007] In some embodiments, the color conversion layer further includes a second color conversion part arranged along a first direction with the first color conversion part, the first direction intersects with the thickness direction of the substrate, and the second color conversion part is configured to: convert the first color light rays incident on the second color conversion part into third color light rays. The cholesteric liquid crystal layer further includes a second cholesteric liquid crystal part located between the substrate and the second color conversion part; the second cholesteric liquid crystal part is configured to: reflect the light rays in the first color light rays that have not undergone conversion back to the second color conversion part.

[0008] In some embodiments, the cholesteric liquid crystals in the first cholesteric liquid crystal part and the second cholesteric liquid crystal part are in a planar state.

[0009] In some embodiments, the color conversion substrate further includes a light-transmitting part arranged along a first direction with the color conversion layer, the first direction intersects with the thickness direction of the substrate, and the first color light rays pass through the light-transmitting part. The cholesteric liquid crystal layer further includes a third cholesteric liquid crystal part located between the substrate and the light-transmitting part; the third cholesteric liquid crystal part is configured to: disperse the part of the first color light rays passing through the light-transmitting part that is close to the positive viewing angle towards the large viewing angle direction.

[0010] In some embodiments, the cholesteric liquid crystals in the third cholesteric liquid crystal part are in a focal conic state.

[0011] In some embodiments, the first cholesteric liquid crystal part includes a first chiral liquid crystal part and a second chiral liquid crystal part arranged in a stacked manner. The helical direction of the liquid crystal molecules in the first chiral liquid crystal part is opposite to the helical direction of the liquid crystal molecules in the second chiral liquid crystal part. When the cholesteric liquid crystal layer further includes a second cholesteric liquid crystal part, the second cholesteric liquid crystal part includes a third chiral liquid crystal part and a fourth chiral liquid crystal part arranged in a stacked manner. The helical direction of the liquid crystal molecules in the third chiral liquid crystal part is opposite to the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal part.

[0012] In some embodiments, the pitch of the liquid crystal molecules in the first cholesteric liquid crystal part is greater than or equal to 270 nm and less than or equal to 310 nm. The pitch of the liquid crystal molecules in the second cholesteric liquid crystal part is greater than or equal to 270 nm and less than or equal to 310 nm.

[0013] In some embodiments, the first color light rays are blue light rays. The central reflection wavelength of the first cholesteric liquid crystal part is greater than or equal to 450 nm and less than or equal to 470 nm. The central reflection wavelength of the second cholesteric liquid crystal part is greater than or equal to 450 nm and less than or equal to 470 nm.

[0014] In some embodiments, the full width at half maximum of the transmission spectrum of the first cholesteric liquid crystal part is greater than or equal to 70 nm and less than or equal to 100 nm. The full width at half maximum of the transmission spectrum of the second cholesteric liquid crystal part is greater than or equal to 70 nm and less than or equal to 100 nm.

[0015] In some embodiments, the color conversion substrate further includes an alignment layer located between the cholesteric liquid crystal layer and the substrate. The alignment layer includes a first alignment portion, a second alignment portion, and a third alignment portion arranged along a first direction. The first alignment portion is configured to align the liquid crystal molecules in the first cholesteric liquid crystal portion. The second alignment portion is configured to align the liquid crystal molecules in the second cholesteric liquid crystal portion. The third alignment portion is configured to align the liquid crystal molecules in the third cholesteric liquid crystal portion.

[0016] In some embodiments, the haze of the third cholesteric liquid crystal portion is greater than or equal to 3% and less than or equal to 8%.

[0017] In some embodiments, the transmittance of the third cholesteric liquid crystal portion to light in a first wavelength band is greater than or equal to 90%. The minimum wavelength of the first wavelength band is 450 nm, and the maximum wavelength of the first wavelength band is 470 nm.

[0018] In some embodiments, the thickness of the cholesteric liquid crystal layer is greater than or equal to 2 μm and less than or equal to 6 μm.

[0019] In some embodiments, the material of the first color conversion portion includes a first quantum dot material. The material of the second color conversion portion includes a second quantum dot material.

[0020] In some embodiments, the color conversion substrate further includes a blocking pattern. The blocking pattern includes a plurality of first openings. The first color conversion portion and the first cholesteric liquid crystal portion are located within one first opening. The second color conversion portion and the second cholesteric liquid crystal portion are located within another first opening. The light-transmitting portion and the third cholesteric liquid crystal portion are located within yet another first opening.

[0021] In some embodiments, the color conversion substrate further includes a light-blocking layer located between the cholesteric liquid crystal layer and the substrate. The light-blocking layer includes a light-absorbing pattern and a plurality of color film portions. The light-absorbing pattern includes a plurality of second openings, and the plurality of second openings are directly opposite to the plurality of first openings. The plurality of color film portions are located on the side of the substrate close to the cholesteric liquid crystal layer; the color film portions are disposed within one second opening. The plurality of color film portions include a first color film portion directly opposite to the first color conversion portion, a second color film portion directly opposite to the second color conversion portion, and a third color film portion directly opposite to the light-transmitting portion.

[0022] On the other hand, a method for preparing a color conversion substrate is provided. The preparation method includes: providing a substrate. Forming a cholesteric liquid crystal layer on one side of the substrate; the cholesteric liquid crystal layer includes a first cholesteric liquid crystal part. Forming a color conversion layer on the side of the cholesteric liquid crystal layer away from the substrate; the color conversion layer includes a first color conversion part located on the side of the first cholesteric liquid crystal part away from the substrate. Wherein, the first color conversion part is configured to: convert the first color light rays incident on the first color conversion part into second color light rays. The first cholesteric liquid crystal part is configured to: reflect the light rays in the first color light rays that have not undergone conversion back to the first color conversion part.

[0023] The beneficial effects that can be achieved by the method for preparing a color conversion substrate provided by some embodiments of the present disclosure are the same as those that can be achieved by a color conversion substrate provided by the above technical solution, and will not be elaborated here.

[0024] In some embodiments, the color conversion substrate further includes a light-transmitting part arranged along a first direction with the color conversion layer, the first direction intersects with the thickness direction of the substrate; the first color light rays can pass through the light-transmitting part. The color conversion layer further includes a second color conversion part arranged along the first direction with the first color conversion part, and the second color conversion part is configured to: convert the first color light rays incident on the second color conversion part into third color light rays. Forming a cholesteric liquid crystal layer on one side of the substrate includes: forming an initial cholesteric liquid crystal layer on one side of the substrate, the initial cholesteric liquid crystal layer includes a first initial cholesteric liquid crystal part, a second initial cholesteric liquid crystal part and a third initial cholesteric liquid crystal part. Forming the first initial cholesteric liquid crystal part into the first cholesteric liquid crystal part, and forming the second initial cholesteric liquid crystal part into the second cholesteric liquid crystal part; the second cholesteric liquid crystal part is located between the substrate and the second color conversion part; the second cholesteric liquid crystal part is configured to: reflect the light rays in the first color light rays that have not undergone conversion back to the second color conversion part. Forming the third initial cholesteric liquid crystal part into the third cholesteric liquid crystal part; the third cholesteric liquid crystal part is located between the substrate and the light-transmitting part, and the third cholesteric liquid crystal part is configured to: disperse the part of the first color light rays passing through the light-transmitting part that is close to the positive viewing angle towards the large viewing angle direction.

[0025] In yet another aspect, a display panel is provided. The display panel includes: the color conversion substrate as described in any one of the above embodiments and a light-emitting substrate. The light-emitting substrate is opposite to the color conversion substrate; the light-emitting substrate is configured to emit first color light rays.

[0026] The beneficial effects that can be achieved by the display panel provided by some embodiments of the present disclosure are the same as those that can be achieved by a color conversion substrate provided by the above technical solution, and will not be elaborated here.

[0027] In some embodiments, the light-emitting substrate includes any one of an OLED light-emitting substrate, an LED light-emitting substrate, a Micro LED light-emitting substrate, and a Mini LED light-emitting substrate.

[0028] In some embodiments, the light-emitting substrate is an OLED light-emitting substrate; the OLED light-emitting substrate includes: a cathode and an anode disposed opposite to each other, and at least two light-emitting units disposed between the cathode and the anode. The light-emitting unit includes a light-emitting layer configured to emit first-color light to the color conversion substrate. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure, and those of ordinary skill in the art can also obtain other drawings based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and do not limit the actual dimensions of the products involved in the embodiments of the present disclosure, the actual processes of the methods, the actual timings of the signals, etc.

[0030] Figure 1 Structural diagram of a display panel according to some embodiments;

[0031] Figure 2 Light-emitting diagram of a color conversion substrate according to some embodiments;

[0032] Figure 3 Structural diagram of a color conversion substrate according to some embodiments;

[0033] Figure 4 Structural diagram of a color conversion substrate according to still some other embodiments;

[0034] Figure 5 Light-emitting diagram of a color conversion substrate according to still some other embodiments;

[0035] Figure 6 Structural diagram of a display panel according to still some other embodiments;

[0036] Figure 7 Process flowchart for preparing a color conversion substrate according to some embodiments;

[0037] Figure 8 Process flowchart for preparing a cholesteric liquid crystal layer according to some embodiments;

[0038] Figure 9 Process diagram for preparing a cholesteric liquid crystal layer according to some embodiments;

[0039] Figure 10 Structural diagram of a display panel according to still some other embodiments;

[0040] Figure 11 Microscopic morphology diagram of a first cholesteric liquid crystal part according to some embodiments;

[0041] Figure 12 Polarizing microscope texture diagram of the first cholesteric liquid crystal part according to some embodiments;

[0042] Figure 13 Transmission spectrum diagram of the first cholesteric liquid crystal part according to some embodiments;

[0043] Figure 14 Microscopic morphology diagram of the third cholesteric liquid crystal part according to some embodiments;

[0044] Figure 15 Polarizing microscope texture diagram of the third cholesteric liquid crystal part according to some embodiments;

[0045] Figure 16 Angular light intensity distribution diagram of the third cholesteric liquid crystal part according to some embodiments. Detailed implementation manners

[0046] Next, the technical solutions in some embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0047] Unless otherwise required by the context, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular form "comprises" and the present participle form "comprising", are interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example", or "some examples", etc., are intended to indicate that the specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the described specific features, structures, materials, or characteristics can be included in any one or more embodiments or examples in any appropriate manner.

[0048] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0049] "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and both include the following combinations of A, B, and C: only A, only B, only C, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0050] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0051] As used herein, the use of "suitable for" or "configured to" means open and inclusive language, which does not exclude a device suitable for or configured to perform additional tasks or steps.

[0052] In addition, the use of "based on" means open and inclusive because a process, step, calculation, or other action "based on" one or more of the stated conditions or values may, in practice, be based on additional conditions or values beyond the stated ones.

[0053] As used herein, "about", "substantially", or "approximately" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0054] As used herein, "parallel", "perpendicular", "equal" include the stated situations and situations similar to the stated ones, and the range of the similar situations is within an acceptable deviation range, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range of approximate parallelism can be, for example, within 5° deviation; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range of approximate perpendicularity can also be, for example, within 5° deviation. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range of approximate equality can be, for example, that the difference between the two equal ones is less than or equal to 5% of either one of them.

[0055] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be that the layer or element is directly on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate.

[0056] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of regions are enlarged for clarity. Thus, variations in the shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances can be envisioned. Therefore, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but include shape deviations caused by, for example, manufacturing. For example, an etched region shown as rectangular will generally have curved features. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shape of the regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0057] It should be noted that in the drawings of the present disclosure, for example, 11~1 indicates that component 11 belongs to component 1. For example, Figure 1 in the figure, 121~120 indicates that the first color conversion part 121 belongs to the color conversion layer 120. Other similar reference numerals appearing in the drawings of the present disclosure also follow the above description. For example, 1 / 2 appearing in the drawings of the present disclosure indicates that both structure 1 and structure 2 can refer to this structure. For example, Figure 3 in the figure, 131 / 132 indicates that both the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 can refer to this structure. Other similar reference numerals appearing in the drawings also follow the above description.

[0058] Currently, in the display field, display panels mainly achieve full-color display through the following three methods.

[0059] The first method is the RGB pixel juxtaposition method, the principle of which is to utilize the independent emission of R (red), G (green), and B (blue) three-color light-emitting materials. In this method, R (red), G (green), and B (blue) are also called the three primary colors, and the three primary colors are relatively pure, but the cost is relatively high. For example, for a light-emitting device such as an OLED, this method can use a fine metal mask and evaporation method to form OLED light-emitting devices of different colors.

[0060] The second method is a method using a combination of a white light-emitting substrate (for example, a white light LED) and a color filter. In this method, a white light-emitting device emits white light as a backlight. The white light is filtered into red light, green light, and blue light by the color filter. This method has a relatively low cost. However, due to the presence of the color filter, there are certain limitations in both the light transmittance and the light color purity. Therefore, in theory, the combination of a white light-emitting device and a color filter performs worse than the RGB pixel juxtaposition method in terms of brightness, contrast, color, and energy saving.

[0061] The third method, as described in the background, is as follows Figure 1 shown, is a method using a combination of a light-emitting substrate 200 and a color conversion substrate 100. In this method, the light (e.g., blue light) emitted by the light-emitting substrate 200 of the display panel 1000 is used as the excitation light to excite the color conversion material in the color conversion substrate 100, perform color conversion on the excitation light, and cause the display panel 1000 to emit light of colors such as red, green, and blue, thereby achieving the purpose of full-color display. For example, the combination of a blue light OLED light-emitting device and the color conversion substrate 100 can utilize an aperture mask, which can reduce the process difficulty, and the color conversion substrate 100 improves the light energy utilization rate. Therefore, using the color conversion substrate 100 to achieve full-color display of the display panel 1000 has been widely applied.

[0062] In some embodiments, as follows Figure 1 shown, for the method of combining the light-emitting substrate 200 and the color conversion substrate 100, the region emitting the first color light L1 corresponds to the first sub-pixel region AA, the region emitting the second color light L2 corresponds to the second sub-pixel region BB, and the region emitting the third color light L3 corresponds to the third sub-pixel region CC. The above first color light L1 is, for example, blue light, the second color light L2 is, for example, red light, and the third color light L3 is, for example, green light.

[0063] In some embodiments, the excitation light emitted by the light-emitting substrate 200 is the first color light L1. In this case, the first color light L1 located in the first sub-pixel region AA can be emitted directly without passing through the color conversion material; the first color light L1 located in the second sub-pixel region BB is emitted after being converted into the second color light L2 by the color conversion material corresponding to the second color; the first color light L1 located in the third sub-pixel region CC is emitted after being converted into the third color light L3 by the color conversion material corresponding to the third color.

[0064] In some implementation manners, the color conversion material in the color conversion substrate fails to completely convert the first color light L1 (e.g., blue light) emitted by the light-emitting substrate, causing the un-converted first color light L1 to be emitted from the second sub-pixel region BB and / or the third sub-pixel region CC, resulting in the problem of leakage of the first color light L1. As a result, the second color light L2 (e.g., red light) emitted from the second sub-pixel region BB is doped with the first color light L1 (e.g., blue light), and / or the third color light L3 (e.g., green light) emitted from the third sub-pixel region CC is doped with the first color light L1 (e.g., blue light), reducing the color purity of the display of the display panel and affecting the display effect.

[0065] In some other implementations, the film layer containing the color conversion material in the color conversion substrate is a color conversion layer, and the external quantum efficiency (EQE) of the color conversion layer is affected by the quantum yield of the color conversion material, the light extraction efficiency, etc. Due to certain limitations in the light extraction efficiency of the color conversion layer, there are certain limitations in the external quantum efficiency of the color conversion layer, which cannot meet the efficiency requirements of the display panel.

[0066] In still some other implementations, there are the following three methods to improve the problem of blue light leakage. In the first method, the color conversion material is a quantum dot material, and the method of increasing the optical density of the quantum dot material is adopted to improve the problem of blue light leakage. However, when the optical density of the quantum dot material increases, it is easy to have poor dispersibility, resulting in a decrease in the quantum yield (QY). At the same time, the quantum dot material with high optical density may lead to a decrease in the optical conversion efficiency. The second method is to stack a color filter containing a dye on the light-emitting side of the color conversion substrate to absorb the leaked blue light and improve the display contrast. However, with this method, the blue light absorbed by the color filter will be wasted and it is difficult to be effectively utilized. The third method is to infiltrate scattering particles such as TiO2 and SiO2 into the color conversion layer to increase the utilization rate of the first color light (for example, blue light). However, there are problems such as easy aggregation, easy quenching, self-absorption and stability of the blended quantum dots and inorganic scattering particles.

[0067] Based on this, as Figure 1 and Figure 2 shown, some embodiments of the present disclosure provide a color conversion substrate 100. The color conversion substrate 100 includes a substrate 110, a color conversion layer 120, and a cholesteric liquid crystal layer 130. The color conversion layer 120 is located on one side of the substrate 110; the color conversion layer 120 includes a first color conversion part 121; the first color conversion part 121 is configured to: convert the first color light L1 incident on the first color conversion part 121 into a second color light L2. The cholesteric liquid crystal layer 130 includes a first cholesteric liquid crystal part 131 located between the substrate 110 and the first color conversion part 121; the first cholesteric liquid crystal part 131 is configured to: reflect the light in the first color light L1 that has not been converted back to the first color conversion part 121.

[0068] In some examples, the substrate 110 may include an insulating material such as glass, plastic, quartz, resin, etc. The substrate 110 may include a material selected from materials having excellent mechanical strength, thermal stability, transparency, surface smoothness, easy processability, and waterproofness.

[0069] Exemplarily, the light transmittance of the substrate 110 is greater than or equal to 99.5%. For example, the light transmittance of the substrate 110 can be 99.5%, 99.6%, 99.7%, 99.8% or 99.9%, etc. Thus, the light converted and formed by the color conversion layer 120 (such as the second color light L2 or the third color light L3), and the first color light L1 emitted from the first pixel region AA can be emitted from the substrate 110 to improve the light emission efficiency.

[0070] Exemplarily, the refractive index of the substrate 110 is less than or equal to 1.30. For example, the refractive index of the substrate 110 can be 1.10, 1.15, 1.20, 1.25 or 1.30, etc. Thus, the light converted and formed by the color conversion layer 120 (such as the second color light L2 or the third color light L3), and the first color light L1 emitted from the first pixel region AA can be prevented from being reflected at the substrate 110 to improve the light emission efficiency.

[0071] In the above color conversion substrate 100, as Figure 2 shown, the color conversion layer 120 is the film layer that realizes the color conversion function in the color conversion substrate 100. The first color conversion part 121 can be the part of the color conversion layer 120 located in the second sub-pixel region BB, and can contain the color conversion material corresponding to the second color. Thus, the first color light L1 incident on the first color conversion part 121 can be converted into the second color light L2. Among them, the first color light L1 is, for example, blue light, and the second color light L2 is, for example, red light.

[0072] Exemplarily, the thickness of the first color conversion part 121 can be 8 μm to 12 μm. For example, the thickness of the first color conversion part 121 can be 8 μm, 9 μm, 10 μm, 11 μm or 12 μm, etc.

[0073] In the related art, cholesteric liquid crystal (CLC) is a one-dimensional photonic crystal. It is different from other nematic or smectic liquid crystal materials. The cholesteric liquid crystal molecules are flat and arranged in layers. The molecules within the layer are parallel to each other, the long axis of the molecules is parallel to the layer plane, and the long axis directions of the molecules in different layers change slightly and are arranged in a helical structure along the normal direction of the layer. Due to the unique helical twisted structure of the cholesteric liquid crystal, it has special optical properties such as optical rotation and selective reflection. Cholesteric liquid crystals with different pitches have different reflection bands (also called reflection windows). Therefore, it can selectively reflect the light with wavelengths within its reflection band and transmit the light with wavelengths not within its reflection band. Therefore, cholesteric liquid crystals that reflect red light, cholesteric liquid crystals that reflect green light or cholesteric liquid crystals that reflect blue light can be fabricated respectively.

[0074] In the above color conversion substrate 100, asFigure 2 As shown, the material of the cholesteric liquid crystal layer 130 may include cholesteric liquid crystals that reflect the first color light L1. Thus, the first color light L1 can be reflected. The first color light L1 is, for example, blue light.

[0075] It can be understood that, as Figure 2 shown, since the first cholesteric liquid crystal part 131 is located between the substrate 110 and the first color conversion part 121, when the material of the first cholesteric liquid crystal part 131 includes cholesteric liquid crystals that reflect the first color light L1, the first color light L1 that passes through the first color conversion part 121 but is not converted can be reflected back to the first color conversion part 121 by the first cholesteric liquid crystal part 131, exciting the color conversion material in the first color conversion part 121 and being converted into the second color light L2. Thus, on the one hand, the first color light L1 leaking from the second sub-pixel region BB can be reduced, making the color purity of the second color light L2 emitted from the second sub-pixel region BB relatively high, improving the color purity of the display panel 1000. At the same time, the crosstalk caused by the leaked first color light L1 entering the adjacent sub-pixel region can be avoided, broadening the color gamut. On the other hand, the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120 can be improved, increasing the external quantum efficiency of the color conversion layer 120.

[0076] In some embodiments, the material of the first color conversion part 121 includes a first quantum dot material.

[0077] It can be understood that quantum dot materials have the advantages of high brightness, high color volume, and high efficiency. When the material of the first color conversion part 121 includes a first quantum dot material, the first quantum dot material can be excited by the first color light L1 and emit the second color light L2. Moreover, the emitted second color light L2 has a relatively high brightness. Thus, the display effect of the display panel 1000 can be improved.

[0078] Exemplarily, the first quantum dot material can be CdSe, CdSe / ZnS, InP, CuInS2 (abbreviated as CIS), AgInS2 (abbreviated as AIS), AgGaS2 (abbreviated as AGS), or a perovskite-based quantum dot material. Among them, CdSe / ZnS is a quantum dot material with CdSe as the core and ZnS as the shell layer.

[0079] Exemplarily, the peak wavelength of the photoluminescence spectrum of the first quantum dot material can be in the range of 625 nm to 645 nm. For example, the peak wavelength of the photoluminescence spectrum of the first quantum dot material can be 625 nm, 630 nm, 635 nm, 640 nm, or 645 nm, etc. In this case, the light emitted by the first quantum dot material (i.e., the second color light L2) is red light.

[0080] Exemplarily, the full width at half maximum (FWHM) of the photoluminescence spectrum of the first quantum dot material can be in the range of 15 nm to 35 nm; for example, the full width at half maximum (FWHM) of the photoluminescence spectrum of the first quantum dot material can be 15 nm, 20 nm, 25 nm, 30 nm, or 35 nm, etc. Thus, the color purity of the second color light L2 converted from the first quantum dot material can be improved.

[0081] Exemplarily, the chromaticity coordinate CIEx of the emitted light of the first quantum dot material can be in the range of 0.685 to 0.710; for example, the chromaticity coordinate CIEx of the emitted light of the first quantum dot material can be 0.685, 0.690, 0.695, 0.700, 0.705, or 0.710, etc. In this case, the light emitted by the first quantum dot material (i.e., the second color light L2) is red light. It should be noted that the chromaticity coordinate CIEx refers to the chromaticity coordinate in the CIE chromaticity diagram, and the CIE chromaticity diagram is a color system created by the International Commission on Illumination (CIE). In this color system, color attributes can be represented by the chromaticity coordinates CIEx and CIEy.

[0082] In some examples, the material of the first color conversion portion 121 further includes a first light-transmitting host material, which is, for example, a light-transmitting glue, and the first quantum dot material is dispersed in the first light-transmitting host material. Moreover, the doping amount of the first quantum dot material is 20 wt% to 50 wt%; for example, the doping amount of the first quantum dot material can be 20 wt%, 30 wt%, 42 wt%, or 50 wt%, etc.

[0083] In some embodiments, as Figure 1 and Figure 2 shown, the color conversion layer 120 further includes a second color conversion portion 122 arranged along the first direction X with the first color conversion portion 121. The first direction X intersects the thickness direction Y of the substrate 110. The second color conversion portion 122 is configured to: convert the first color light L1 incident on the second color conversion portion 122 into a third color light L3. The cholesteric liquid crystal layer 130 further includes a second cholesteric liquid crystal portion 132 located between the substrate 110 and the second color conversion portion 122; the second cholesteric liquid crystal portion 132 is configured to: reflect the light in the first color light L1 that has not been converted back to the second color conversion portion 122.

[0084] The above-mentioned second color conversion portion 122 can be the part of the color conversion layer 120 located in the third sub-pixel region CC, and can include a color conversion material corresponding to the third color. Thus, the first color light L1 incident on the second color conversion portion 122 can be converted into a third color light L3. Among them, the first color light L1 is, for example, blue light, and the second color light L2 is, for example, green light.

[0085] It can be understood that, as Figure 2 shown, since the second cholesteric liquid crystal part 132 is located between the substrate 110 and the second color conversion part 122, when the material of the second cholesteric liquid crystal part 132 includes cholesteric liquid crystal that reflects the first color light L1, the first color light L1 that passes through the second color conversion part 122 but is not converted can be reflected back to the second color conversion part 122 by the second cholesteric liquid crystal part 132, exciting the color conversion material in the second color conversion part 122 and being converted into the third color light L3. In this way, firstly, the first color light L1 leaking from the third sub-pixel region CC can be reduced, so that the color purity of the third color light L3 emitted from the third sub-pixel region CC is relatively high, the color purity of the display panel 1000 can be improved, and at the same time, the leaked first color light L1 entering the adjacent sub-pixel region can be avoided from causing crosstalk, and the color gamut can be broadened; secondly, the light extraction efficiency of the second color conversion part 122 in the color conversion layer 120 can be improved, and the external quantum efficiency of the color conversion layer 120 can be increased.

[0086] Exemplarily, the thickness of the second color conversion part 122 can be 8μm to 12μm. For example, the thickness of the second color conversion part 122 can be 8μm, 9μm, 10.5μm, 11μm or 12μm, etc. Moreover, the thickness of the second color conversion part 122 and the thickness of the first color conversion part 121 can be the same or different.

[0087] In some examples, the second cholesteric liquid crystal part 132 and the first cholesteric liquid crystal part 131 can be arranged along the first direction X; moreover, the thickness H2 of the second cholesteric liquid crystal part 132 and the thickness H1 of the first cholesteric liquid crystal part 131 can be the same or different.

[0088] Exemplarily, as Figure 1 shown, the first direction X is perpendicular to the thickness direction Y of the substrate 110.

[0089] In some embodiments, the material of the second color conversion part 122 includes a second quantum dot material.

[0090] It can be understood that the quantum dot material has the advantages of high brightness, high color volume and high efficiency. When the material of the second color conversion part 122 includes the second quantum dot material, the second quantum dot material can be excited by the first color light L1 to emit the third color light L3, and moreover, the emitted third color light L3 has a relatively high brightness. In this way, the display effect of the display panel 1000 can be improved.

[0091] Exemplarily, the second quantum dot material can be CdSe, CdSe / ZnS, InP, CuInS2 (abbreviated as CIS), AgInS2 (abbreviated as AIS), AgGaS2 (abbreviated as AGS) or a perovskite-based quantum dot material.

[0092] Exemplarily, the peak wavelength of the photoluminescence spectrum of the second quantum dot material may be in the range of 525 nm to 540 nm; for example, the peak wavelength of the photoluminescence spectrum of the second quantum dot material may be 525 nm, 530 nm, 535 nm, or 540 nm, etc. In this case, the light emitted by the second quantum dot material (i.e., the third color light L3) is green light.

[0093] Exemplarily, the full width at half maximum (FWHM) of the photoluminescence spectrum of the second quantum dot material may be in the range of 15 nm to 35 nm; for example, the full width at half maximum (FWHM) of the photoluminescence spectrum of the second quantum dot material may be 15 nm, 22 nm, 25 nm, 31 nm, or 35 nm, etc. Thus, the color purity of the third color light L3 formed by conversion of the second quantum dot material can be improved.

[0094] Exemplarily, the chromaticity coordinate CIEx of the light emitted by the second quantum dot material may be in the range of 0.170 to 0.230; for example, the chromaticity coordinate CIEx of the light emitted by the second quantum dot material may be 0.170, 0.180, 0.190, 0.200, 0.205, 0.210, 0.220, or 0.230, etc. In this case, the light emitted by the second quantum dot material (i.e., the third color light L3) is green light.

[0095] In some examples, the material of the second color conversion unit 122 further includes a second light-transmitting host material, which is, for example, a light-transmitting glue, and the second quantum dot material is dispersed in the second light-transmitting host material. Moreover, the doping amount of the second quantum dot material is 20 wt% to 50 wt%; for example, the doping amount of the second quantum dot material may be 20 wt%, 33 wt%, 40 wt%, or 50 wt%, etc.

[0096] In the related art, the cholesteric liquid crystal has two zero-field stable states, one of which is the planar state (Planarstate), which can also be called the planar texture state. Under the action of zero electric field, the cholesteric liquid crystal in the planar state has a periodic helical structure, and its helical axis is basically perpendicular to the surface of the substrate (such as the substrate 110). The planar state cholesteric liquid crystal has good reflection performance and can reflect light in a set wavelength band. Therefore, the planar state cholesteric liquid crystal can exhibit the performance of a distributed Bragg reflector (DBR).

[0097] In some embodiments, as Figure 3 shown, the cholesteric liquid crystal in the first cholesteric liquid crystal part 131 is in the planar state.

[0098] It can be understood that when the cholesteric liquid crystal in the first cholesteric liquid crystal part 131 is in a planar state, the first cholesteric liquid crystal part 131 can perform Bragg reflection and has good reflection performance. Moreover, by adjusting the pitch of the cholesteric liquid crystal in the first cholesteric liquid crystal part 131, the first cholesteric liquid crystal part 131 can reflect the first color light ray L1. In this way, the first color light ray L1 that passes through the first color conversion part 121 but is not converted can be reflected back to the first color conversion part 121 by the first cholesteric liquid crystal part 131, exciting the color conversion material in the first color conversion part 121 and being converted into the second color light ray L2. The first color light ray L1 leaking from the second sub-pixel region BB can be reduced, the color purity of the second color light ray L2 emitted from the second sub-pixel region BB can be relatively high, and at the same time, the leaked first color light ray L1 entering the adjacent sub-pixel region to cause crosstalk can be avoided, and the color gamut can be broadened; at the same time, the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120 can be improved.

[0099] In some embodiments, as Figure 3 shown, the cholesteric liquid crystal in the second cholesteric liquid crystal part 132 is in a planar state.

[0100] It can be understood that when the cholesteric liquid crystal in the second cholesteric liquid crystal part 132 is in a planar state, the second cholesteric liquid crystal part 132 can perform Bragg reflection and has good reflection performance. Moreover, by adjusting the pitch of the cholesteric liquid crystal in the second cholesteric liquid crystal part 132, the second cholesteric liquid crystal part 132 can reflect the first color light ray L1. In this way, the first color light ray L1 that passes through the second color conversion part 122 but is not converted can be reflected back to the second color conversion part 122 by the second cholesteric liquid crystal part 132, exciting the color conversion material in the second color conversion part 122 and being converted into the third color light ray L3. The first color light ray L1 leaking from the third sub-pixel region CC can be reduced, the color purity of the third color light ray L3 emitted from the third sub-pixel region CC can be relatively high, and at the same time, the leaked first color light ray L1 entering the adjacent sub-pixel region to cause crosstalk can be avoided, and the color gamut can be broadened; at the same time, the light extraction efficiency of the second color conversion part 122 in the color conversion layer 120 can be improved.

[0101] In some implementations, due to the isotropic emission characteristics of the color conversion material (such as quantum dot material), the second color light and the third color light obtained by conversion through the color conversion layer have a relatively wide angular distribution. The angular distribution of the un-converted first color light is determined by the optical characteristics of the light-emitting substrate. When the light-emitting substrate is a light-emitting substrate of types such as an Organic Light Emitting Diode (OLED) light-emitting substrate, among the first color light emitted, there are relatively more lights near the positive viewing angle, making the first color light L1 have a relatively narrow angular distribution, resulting in a mismatch in the angular distribution of the lights emitted from the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region, and causing the problem of angular color shift.

[0102] In some embodiments, as Figure 1 and Figure 2 shown, the color conversion substrate 100 further includes a light-transmitting portion 140 arranged along a first direction X with the color conversion layer 120. The first direction X intersects with the thickness direction of the substrate 110, and the first color light L1 passes through the light-transmitting portion 140. The cholesteric liquid crystal layer 130 further includes a third cholesteric liquid crystal portion 133 located between the substrate 110 and the light-transmitting portion 140; the third cholesteric liquid crystal portion 133 is configured to: disperse the portion of the first color light L1 near the positive viewing angle passing through the light-transmitting portion 140 towards the large viewing angle direction.

[0103] The above-mentioned light-transmitting portion 140 and the color conversion portion are arranged along the first direction X. Exemplarily, as Figure 1 shown, the light-transmitting portion 140 can be substantially flush with the color conversion portion in the first direction X. In this way, the surface of the color conversion substrate 100 can be relatively flat. Moreover, the light-transmitting portion 140 can be located at a position directly opposite to the first sub-pixel region AA, so that the first color light L1 can pass through the light-transmitting portion 140 and be emitted from the first sub-pixel region AA.

[0104] Exemplarily, the material of the light-transmitting portion 140 can be a transparent photoresist.

[0105] Exemplarily, the thickness of the light-transmitting portion 140 can be 8 μm to 12 μm. For example, the thickness of the light-transmitting portion 140 can be 8 μm, 9 μm, 10.2 μm, 11.2 μm, or 12 μm, etc. Moreover, the thickness of the light-transmitting portion 140 and the thickness of the color conversion layer 120 can be the same or different.

[0106] It can be understood that when a third cholesteric liquid crystal layer 133 is provided between the substrate 110 and the light-transmitting portion 140, and the third cholesteric liquid crystal layer 133 disperses the part of the first color light L1 near the normal viewing angle towards the large viewing angle direction, compared with the case where the third cholesteric liquid crystal layer 133 is not provided, the angular distribution of the first color light L1 emitted from the first sub-pixel region AA is relatively wide. In this way, the matching of the angular distributions of the light rays emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC can be improved, and the problem of angular color shift can be alleviated.

[0107] In the related art, the second zero-field stable state of the cholesteric liquid crystal is the focal conic state, which can also be called the focal conic texture state. The cholesteric liquid crystal in the focal conic state presents a multi-domain shape, and the helical structure still exists in each domain. Therefore, the cholesteric liquid crystal in the focal conic state scatters the incident light. Moreover, the cholesteric liquid crystal in the focal conic state does not depend on the polarization characteristics of the incident light.

[0108] In some embodiments, as Figure 4 shown, the cholesteric liquid crystal in the third cholesteric liquid crystal layer 133 is in the focal conic state.

[0109] It can be understood that when the cholesteric liquid crystal in the third cholesteric liquid crystal layer 133 is in the focal conic state, it is equivalent to adding scattering particles to the third cholesteric liquid crystal layer 133, so that the third cholesteric liquid crystal layer 133 can scatter the first color light L1 and realize the shaping of the emission spectrum of the first color light L1. In this way, the angular distribution of the first color light L1 emitted from the first sub-pixel region AA can be relatively wide, the matching of the angular distributions of the light rays emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC can be improved, and the problem of angular color shift can be alleviated.

[0110] Next, the helical direction of the liquid crystal molecules in the cholesteric liquid crystal and the concept of the pitch will be described. In the related art, the helical structure of the cholesteric liquid crystal is left-handed or right-handed. According to the helical direction of the helical structure, the cholesteric liquid crystal can be divided into left-handed cholesteric liquid crystal and right-handed cholesteric liquid crystal. The cholesteric liquid crystal contains many layers of molecules. The arrangement direction of each layer of molecules is the same, but the arrangement direction of adjacent two layers of molecules rotates slightly, and they are stacked into a helical structure layer by layer. When the arrangement of the molecules rotates 360 degrees and returns to the original direction, the distance between two layers with exactly the same molecular arrangement is called the pitch of the cholesteric liquid crystal. According to actual needs, a chiral agent or the like can be added to the cholesteric liquid crystal to change the pitch. If the wavelength of the incident light is the same as the pitch of the cholesteric liquid crystal, the cholesteric liquid crystal allows the incident light with the opposite helical direction to pass through and reflects the incident light with the same helical direction. If the wavelength of the incident light is not the same as the pitch of the cholesteric liquid crystal, the cholesteric liquid crystal allows all the incident light to pass through. Therefore, the reflection or transmission of the incident light can be changed by adjusting the pitch.

[0111] In some embodiments, as Figure 5 shown, the first cholesteric liquid crystal part 131 includes a first chiral liquid crystal part 1311 and a second chiral liquid crystal part 1312 which are stacked. The helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 is opposite to the helical direction of the liquid crystal molecules in the second chiral liquid crystal part 1312.

[0112] It can be understood that since the first cholesteric liquid crystal part 131 can reflect the first color light L1, the pitch of the cholesteric liquid crystal in the first cholesteric liquid crystal part 131 is consistent with the wavelength of the first color light L1. That is to say, the pitch of the first chiral liquid crystal part 1311 and the second chiral liquid crystal part 1312 is consistent with the wavelength of the first color light L1. In this way, as Figure 5 shown, the part L11 of the first color light L1 whose helical direction is the same as the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 can be reflected back to the first color conversion part 121 by the first chiral liquid crystal part 1311 and converted into the second color light L2; at the same time, since the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 is opposite to the helical direction of the liquid crystal molecules in the second chiral liquid crystal part 1312, the part L12 of the first color light L1 whose helical direction is opposite to the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 can be reflected back to the first color conversion part 121 by the second chiral liquid crystal part 1312 and converted into the second color light L2. In this way, the reflection ability of the first cholesteric liquid crystal part 131 to the first color light L1 can be improved, so that relatively less first color light L1 leaks from the second sub-pixel region BB, and the color purity of the second color light L2 emitted from the second sub-pixel region BB is relatively high; at the same time, the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120 can be improved.

[0113] In some examples, the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 is left-handed. At this time, the helical direction of the liquid crystal molecules in the second chiral liquid crystal part 1312 is right-handed. In other examples, the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 is right-handed. At this time, the helical direction of the liquid crystal molecules in the second chiral liquid crystal part 1312 is left-handed.

[0114] It should be noted that in the first cholesteric liquid crystal part 131, the part close to the first color conversion part 121 can be the first chiral liquid crystal part 1311 or the second chiral liquid crystal part 1312, and there is no limit here.

[0115] In some embodiments, as Figure 5As shown, when the cholesteric liquid crystal layer 130 further includes a second cholesteric liquid crystal portion 132, the second cholesteric liquid crystal portion 132 includes a third chiral liquid crystal portion 1321 and a fourth chiral liquid crystal portion 1322 that are stacked. The helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 is opposite to the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal portion 1322.

[0116] It can be understood that since the second cholesteric liquid crystal portion 132 can reflect the first color light L1, the pitch of the cholesteric liquid crystal in the second cholesteric liquid crystal portion 132 is consistent with the wavelength of the first color light L1. That is to say, the pitches of the third chiral liquid crystal portion 1321 and the fourth chiral liquid crystal portion 1322 are consistent with the wavelength of the first color light L1. In this way, as Figure 5 shown, the part L11 of the first color light L1 whose helical direction is the same as the helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 can be reflected back to the first color conversion portion 121 by the third chiral liquid crystal portion 1321 and converted into the third color light L3; at the same time, since the helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 is opposite to the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal portion 1322, the part L12 of the first color light L1 whose helical direction is opposite to the helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 can be reflected back to the second color conversion portion 122 by the fourth chiral liquid crystal portion 1322 and converted into the third color light L3. In this way, the reflection ability of the second cholesteric liquid crystal portion 132 to the first color light L1 can be improved, so that relatively less of the first color light L1 leaks from the third sub-pixel region CC, and the color purity of the third color light L3 emitted from the third sub-pixel region CC is relatively high; at the same time, the light extraction efficiency of the second color conversion portion 122 in the color conversion layer 120 can be improved.

[0117] In some examples, the helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 is left-handed. At this time, the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal portion 1322 is right-handed. In other examples, the helical direction of the liquid crystal molecules in the third chiral liquid crystal portion 1321 is right-handed. At this time, the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal portion 1322 is left-handed.

[0118] It should be noted that in the second cholesteric liquid crystal portion 132, the part close to the second color conversion portion 122 can be the third chiral liquid crystal portion 1321 or the fourth chiral liquid crystal portion 1322, and there is no limitation here.

[0119] In some embodiments, the pitch of the liquid crystal molecules in the first cholesteric liquid crystal portion 131 is greater than or equal to 270 nm and less than or equal to 310 nm.

[0120] It can be understood that when the pitch of the liquid crystal molecules in the first cholesteric liquid crystal part 131 is in the range of 270 nm to 310 nm, the wavelength of the light that the first cholesteric liquid crystal part 131 can reflect matches the wavelength of the blue light. Thus, by using the first cholesteric liquid crystal part 131, the blue light leaking from the second sub-pixel region BB can be reflected back to the first color conversion part 121 and converted into the second color light L2 (for example, red light) by the second color conversion part 122, so that the color purity of the second color light L2 emitted from the second sub-pixel region BB is relatively high; at the same time, the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120 can be improved.

[0121] Exemplarily, the pitch of the liquid crystal molecules in the first cholesteric liquid crystal part 131 can be 270 nm, 280 nm, 290 nm, 300 nm, 310 nm, etc.

[0122] In some embodiments, the pitch of the liquid crystal molecules in the second cholesteric liquid crystal part 132 is greater than or equal to 270 nm and less than or equal to 310 nm.

[0123] It can be understood that when the pitch of the liquid crystal molecules in the second cholesteric liquid crystal part 132 is in the range of 270 nm to 310 nm, the wavelength of the light that the second cholesteric liquid crystal part 132 can reflect matches the wavelength of the blue light. Thus, by using the second cholesteric liquid crystal part 132, the blue light leaking from the third sub-pixel region CC can be reflected back to the second color conversion part 122 and converted into the third color light L3 (for example, green light) by the second color conversion part 122, so that the color purity of the third color light L3 emitted from the third sub-pixel region CC is relatively high; at the same time, the light extraction efficiency of the second color conversion part 122 in the color conversion layer 120 can be improved.

[0124] Exemplarily, the pitch of the liquid crystal molecules in the second cholesteric liquid crystal part 132 can be 270 nm, 278 nm, 291 nm, 300 nm, 310 nm, etc.

[0125] In some embodiments, the first color light L1 is blue light. The central reflection wavelength of the first cholesteric liquid crystal part 131 is greater than or equal to 450 nm and less than or equal to 470 nm.

[0126] It can be understood that when the central reflection wavelength of the first cholesteric liquid crystal part 131 is in the range of 450 nm to 470 nm, the wavelength corresponding to the trough of the transmission spectrum of the first cholesteric liquid crystal part 131 is in the range of 450 nm to 470 nm. That is to say, the first cholesteric liquid crystal part 131 can reflect light with a wavelength in the range of 450 nm to 470 nm. Thus, by using the first cholesteric liquid crystal part 131, the blue light leaking from the second sub-pixel region BB can be reflected back to the first color conversion part 121 and converted into the second color light L2 (for example, red light) by the second color conversion part 122, so that the color purity of the second color light L2 emitted from the second sub-pixel region BB is relatively high; at the same time, the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120 can be improved.

[0127] Exemplarily, the central reflection wavelength of the first cholesteric liquid crystal part 131 can be 450 nm, 455 nm, 460 nm, 465 nm, 470 nm, etc.

[0128] In some embodiments, the first color light L1 is blue light. The central reflection wavelength of the second cholesteric liquid crystal part 132 is greater than or equal to 450 nm and less than or equal to 470 nm.

[0129] It can be understood that when the central reflection wavelength of the second cholesteric liquid crystal part 132 is in the range of 450 nm to 470 nm, the wavelength corresponding to the trough of the transmission spectrum of the second cholesteric liquid crystal part 132 is in the range of 450 nm to 470 nm. That is to say, the second cholesteric liquid crystal part 132 reflects light with a wavelength in the range of 450 nm to 470 nm. Thus, by using the second cholesteric liquid crystal part 132, the blue light leaking from the third sub-pixel region CC can be reflected back to the second color conversion part 122 and converted into the third color light L3 (for example, green light) by the second color conversion part 122, so that the color purity of the third color light L3 emitted from the third sub-pixel region CC is relatively high; at the same time, the light extraction efficiency of the second color conversion part 122 in the color conversion layer 120 can be improved.

[0130] Exemplarily, the central reflection wavelength of the second cholesteric liquid crystal part 132 can be 450 nm, 454 nm, 460 nm, 466 nm, 470 nm, etc.

[0131] In some embodiments, the full width at half maximum of the transmission spectrum of the first cholesteric liquid crystal part 131 is greater than or equal to 70 nm and less than or equal to 100 nm.

[0132] It can be understood that when the full width at half maximum (FWHM) of the transmission spectrum of the first cholesteric liquid crystal part 131 is in the range of 70 nm to 100 nm, the trough peak of the transmission spectrum of the first cholesteric liquid crystal part 131 is relatively narrow. In this way, the first cholesteric liquid crystal part 131 can specifically reflect the first color light L1 (for example, blue light), and relatively less reflect light in other wavelength bands or other color lights. Thus, it is possible to avoid the loss of light in other wavelength bands or other color lights during multiple reflections, and improve the light extraction efficiency of the first color conversion part 121 in the color conversion layer 120.

[0133] Exemplarily, the full width at half maximum (FWHM) of the transmission spectrum of the first cholesteric liquid crystal part 131 can be 70 nm, 80 nm, 90 nm, 100 nm, etc.

[0134] In some embodiments, the full width at half maximum (FWHM) of the transmission spectrum of the second cholesteric liquid crystal part 132 is greater than or equal to 70 nm and less than or equal to 100 nm.

[0135] It can be understood that when the full width at half maximum (FWHM) of the transmission spectrum of the second cholesteric liquid crystal part 132 is in the range of 70 nm to 100 nm, the trough peak of the transmission spectrum of the second cholesteric liquid crystal part 132 is relatively narrow. In this way, the second cholesteric liquid crystal part 132 can specifically reflect the first color light L1 (for example, blue light), and relatively less reflect light in other wavelength bands or other color lights. Thus, it is possible to avoid the loss of light in other wavelength bands or other color lights during multiple reflections, and improve the light extraction efficiency of the second color conversion part 122 in the color conversion layer 120.

[0136] Exemplarily, the full width at half maximum (FWHM) of the transmission spectrum of the second cholesteric liquid crystal part 132 can be 70 nm, 85 nm, 95 nm, 100 nm, etc.

[0137] In some embodiments, as Figure 6 shown, the color conversion substrate 100 further includes an alignment layer 150 located between the cholesteric liquid crystal layer 130 and the substrate 110. The alignment layer 150 includes a first alignment part 151, a second alignment part 152, and a third alignment part 153 arranged along the first direction X. The first alignment part 151 is configured to align the liquid crystal molecules in the first cholesteric liquid crystal part 131. The second alignment part 152 is configured to align the liquid crystal molecules in the second cholesteric liquid crystal part 132. The third alignment part 153 is configured to align the liquid crystal molecules in the third cholesteric liquid crystal part 133.

[0138] By providing an alignment layer 150 between the cholesteric liquid crystal layer 130 and the substrate 110 and making the molecules of the alignment layer 150 parallel to the substrate 110, in this way, the initial alignment of the liquid crystal molecules in the first cholesteric liquid crystal part 131 can be made parallel to the substrate 110 by using the first alignment part 151, achieving the purpose of aligning the liquid crystal molecules in the first cholesteric liquid crystal part 131; the initial alignment of the liquid crystal molecules in the second cholesteric liquid crystal part 132 can be made parallel to the substrate 110 by using the second alignment part 152, achieving the purpose of aligning the liquid crystal molecules in the second cholesteric liquid crystal part 132; the initial alignment of the liquid crystal molecules in the third cholesteric liquid crystal part 133 can be made parallel to the substrate 110 by using the third alignment part 153, achieving the purpose of aligning the liquid crystal molecules in the third cholesteric liquid crystal part 133. Thus, the molecular long axes of the liquid crystal molecules in the first initial cholesteric liquid crystal part 131a, the molecular long axes of the liquid crystal molecules in the second initial cholesteric liquid crystal part 132a, and the molecular long axes of the liquid crystal molecules in the third initial cholesteric liquid crystal part 133a can be made parallel to the substrate 110, forming a cholesteric liquid crystal structure. The above alignment principle can be photo-alignment or rubbing alignment, and there is no limitation here. For the introduction of the first initial cholesteric liquid crystal part 131a, the second initial cholesteric liquid crystal part 132a, and the third initial cholesteric liquid crystal part 133a, reference can be made to the S2.1 part in the following preparation method of the color conversion substrate 100, which will not be elaborated here.

[0139] Exemplarily, the material of the alignment layer 150 can be an aligning agent, such as polyimide.

[0140] It should be noted that when the first cholesteric liquid crystal part 131 includes a first chiral liquid crystal part 1311 and a second chiral liquid crystal part 1312, the first alignment part 151 can align the liquid crystal molecules in the one closer to the substrate 110 among the first chiral liquid crystal part 1311 and the second chiral liquid crystal part 1312. When the second cholesteric liquid crystal part 132 includes a third chiral liquid crystal part 1321 and a fourth chiral liquid crystal part 1322, the second alignment part 152 can align the liquid crystal molecules in the one closer to the substrate 110 among the third chiral liquid crystal part 1321 and the fourth chiral liquid crystal part 1322.

[0141] The above is an exemplary description of the first cholesteric liquid crystal part 131, the second cholesteric liquid crystal part 132, and the alignment layer 150. The following is an exemplary introduction of the third cholesteric liquid crystal part 133.

[0142] In the related art, haze is the percentage of the transmitted light intensity deviated from the incident light by more than 2.5° in the total transmitted light intensity. The greater the haze, the more the film gloss, transparency, especially the imaging degree decreases.

[0143] In some embodiments, the haze of the third cholesteric liquid crystal part 133 is greater than or equal to 3% and less than or equal to 8%.

[0144] It can be understood that when the haze of the third cholesteric liquid crystal part 133 is in the range of 3% to 8%, the front light extraction efficiency of the third cholesteric liquid crystal part 133 is relatively high; moreover, with respect to the first color light L1 incident on the third cholesteric liquid crystal part 133, the first color light L1 transmitted through the third cholesteric liquid crystal part 133 has a relatively wide angular distribution. In this way, the matching of the angular distribution of the light emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC can be improved, and the problem of angular color shift can be alleviated.

[0145] Exemplarily, the haze of the third cholesteric liquid crystal part 133 can be 3%, 4%, 5%, 6%, 7%, 8%, etc.

[0146] In some embodiments, the transmittance of the third cholesteric liquid crystal part 133 to the light in the first band is greater than or equal to 90%. The minimum wavelength of the first band is 450 nm, and the maximum wavelength of the first band is 470 nm.

[0147] It can be understood that when the minimum wavelength of the first band is 450 nm and the maximum wavelength of the first band is 470 nm, the light in the first band matches the blue light. When the transmittance of the third cholesteric liquid crystal part 133 to the light in the first band is greater than or equal to 90%, the transmittance of the third cholesteric liquid crystal part 133 to the blue light is relatively high. In this way, the light extraction efficiency of the third cholesteric liquid crystal part 133 can be improved, and the color extraction efficiency of the color conversion substrate 100 can be improved.

[0148] Exemplarily, the transmittance of the third cholesteric liquid crystal part 133 to the light in the above-mentioned first band can be 90%, 92%, 94%, 96%, 98%, 99%, 100%, etc.

[0149] In some embodiments, as Figure 2 shown, the thickness H of the cholesteric liquid crystal layer 130 is greater than or equal to 2 μm and less than or equal to 6 μm.

[0150] It can be understood that when the thickness H of the cholesteric liquid crystal layer 130 is in the range of 2 μm to 6 μm, on the one hand, the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 can have a certain thickness to achieve the function of reflecting the first color light L1. On the other hand, it can avoid the cholesteric liquid crystal layer 130 from absorbing too much incident light. Specifically, when the thickness H1 of the first cholesteric liquid crystal part 131 is in the range of 2 μm to 6 μm, it can avoid the first cholesteric liquid crystal part 131 from absorbing too much light passing through the first color conversion part 121, such as the second color light L2 generated by conversion, and / or the first color light L1 that has not been converted. When the thickness H2 of the second cholesteric liquid crystal part 132 is in the range of 2 μm to 6 μm, it can avoid the second cholesteric liquid crystal part 132 from absorbing too much light passing through the second color conversion part 122, such as the third color light L3 generated by conversion, and / or the first color light L1 that has not been converted. When the thickness H2 of the second cholesteric liquid crystal part 132 is in the range of 2 μm to 6 μm, it can avoid the third cholesteric liquid crystal part 133 from absorbing too much light passing through the light transmissive part 140 (i.e., the first color light L1). In this way, the color extraction efficiency of the color conversion substrate 100 can be relatively high, and the efficiency of the display panel 1000 can be relatively high. On the third hand, when the thickness H of the cholesteric liquid crystal layer 130 is relatively large, its haze is correspondingly high. Therefore, when the thickness H of the cholesteric liquid crystal layer 130 is in the range of 2 μm to 6 μm, it can prevent the haze of the cholesteric liquid crystal layer 130 from being relatively high, and the display panel 1000 can achieve a better display effect.

[0151] Exemplarily, the thickness H1 of the first cholesteric liquid crystal part 131 can be 2 μm, 3 μm, 4 μm, 5 μm or 6 μm, etc.

[0152] Exemplarily, in the case where the first cholesteric liquid crystal part 131 includes a first chiral liquid crystal part 1311 and a second chiral liquid crystal part 1312 arranged in a stacked manner, the thickness of the first chiral liquid crystal part 1311 is greater than or equal to 1 μm and less than or equal to 3 μm, such as 1 μm, 1.3 μm, 2 μm, 2.7 μm or 3 μm, etc., and the thickness of the second chiral liquid crystal part 1312 is greater than or equal to 1 μm and less than or equal to 3 μm, such as 1 μm, 1.4 μm, 2 μm, 2.5 μm or 3 μm, etc. Moreover, the thickness of the first chiral liquid crystal part 1311 and the thickness of the second chiral liquid crystal part 1312 can be the same or different.

[0153] Exemplarily, the thickness H2 of the second cholesteric liquid crystal part 132 can be 2 μm, 3.2 μm, 4 μm, 5.3 μm or 6 μm, etc.

[0154] Exemplarily, when the second cholesteric liquid crystal part 132 includes a third chiral liquid crystal part 1321 and a fourth chiral liquid crystal part 1322 stacked on each other, the thickness of the third chiral liquid crystal part 1321 is greater than or equal to 1 μm and less than or equal to 3 μm, such as 1 μm, 1.5 μm, 2 μm, 2.5 μm, or 3 μm, etc. The thickness of the fourth chiral liquid crystal part 1322 is greater than or equal to 1 μm and less than or equal to 3 μm, such as 1 μm, 1.6 μm, 2 μm, 2.4 μm, or 3 μm, etc. Moreover, the thickness of the third chiral liquid crystal part 1321 and the thickness of the fourth chiral liquid crystal part 1322 may be the same or different.

[0155] Exemplarily, the thickness H3 of the third cholesteric liquid crystal part 133 may be 2 μm, 3 μm, 4.5 μm, 5 μm, or 6 μm, etc.

[0156] It should be noted that the thicknesses of any two of the first cholesteric liquid crystal part 131, the second cholesteric liquid crystal part 132, and the third cholesteric liquid crystal part 133 may be the same or different, and there is no limitation here.

[0157] In some examples, the thicknesses of the first cholesteric liquid crystal part 131, the second cholesteric liquid crystal part 132, and the third cholesteric liquid crystal part 133 are the same. In this way, the first cholesteric liquid crystal part 131, the second cholesteric liquid crystal part 132, and the third cholesteric liquid crystal part 133 can be prepared by a single coating process, which can simplify the process.

[0158] In some embodiments, as Figure 1 and Figure 6 shown, the color conversion substrate 100 further includes a blocking pattern 160. The blocking pattern 160 includes a plurality of first openings Q. The first color conversion part 121 and the first cholesteric liquid crystal part 131 are located within one first opening Q. The second color conversion part 122 and the second cholesteric liquid crystal part 132 are located within another first opening Q. The light-transmitting part 140 and the third cholesteric liquid crystal part 133 are located within yet another first opening Q.

[0159] It can be understood that the blocking pattern 160 can separate the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC. Firstly, it can absorb large-angle light emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC, thereby improving color crosstalk between adjacent sub-pixel regions. Secondly, it can separate the first color conversion part 121 and the second color conversion part 122 during fabrication, enhancing the feasibility of the manufacturing process. Thirdly, it is beneficial to form a relatively thick color conversion layer 120 and cholesteric liquid crystal layer 130. Among them, when the color conversion layer 120 is thick, the conversion efficiency of the color conversion layer 120 for the first color light L1 can be improved. When the cholesteric liquid crystal layer 130 is thick, the reflection effect of the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 on the first color light L1, and the scattering effect of the third cholesteric liquid crystal part 133 on the first color light L1 can be enhanced.

[0160] In some examples, such as Figure 1 and Figure 6 shown, the cross-section of the part of the blocking pattern 160 located between two adjacent sub-pixel regions is an inverted trapezoid with one end having a larger size than the other end, and the end with a smaller size is farther from the substrate 110 relative to the end with a larger size. In this way, among the light emitted by the light-emitting substrate 200, more light can enter the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC.

[0161] Exemplarily, the thickness of the blocking pattern 160 in the second direction Y can be 5μm, 10μm, 15μm, 18μm, or 20μm, etc., and the second direction Y is the thickness direction of the substrate 110.

[0162] Exemplarily, the material of the blocking pattern 160 can be an acrylate-based polymer material or an epoxy-based polymer material.

[0163] In some embodiments, such as Figure 1 and Figure 6 shown, the color conversion substrate 100 further includes a light-blocking layer 170 located between the cholesteric liquid crystal layer 130 and the substrate. The light-blocking layer 170 includes a light-absorbing pattern 171 and a plurality of color film parts 172. The light-absorbing pattern 171 includes a plurality of second openings N, and the plurality of second openings N are aligned with the plurality of first openings Q. The plurality of color film parts 172 are located on the side of the substrate close to the cholesteric liquid crystal layer 130; the color film part 172 is disposed within one second opening N. The plurality of color film parts 172 include a first color film part 1721 aligned with the first color conversion part 121, a second color film part 1722 aligned with the second color conversion part 122, and a third color film part 1723 aligned with the light-transmitting part 140.

[0164] By providing the light-blocking layer 170 with the light-absorbing pattern 171, different color filter portions 172 can be separated, and at the same time, the light irradiated onto the light-absorbing pattern 171 can be absorbed to improve the display contrast of the display panel 1000. By providing the plurality of second openings N to face the plurality of first openings Q, a sub-pixel region can be jointly formed by the first opening Q and the second opening N, such as the first sub-pixel region AA, the second sub-pixel region BB, or the third sub-pixel region CC.

[0165] Exemplarily, the thickness of the light-absorbing pattern 171 in the second direction Y can be 2μm, 3μm, 4μm, 5μm, 6μm, etc.

[0166] Exemplarily, the material of the light-absorbing pattern 171 can be a mixed material of metal, metal oxide, and resin. The metal can be chromium, and the metal oxide can be chromium oxide.

[0167] The above color filter portion 172 can be configured to allow the light of the same color as it to pass through and filter the light of different colors from it. Among them, by providing the first color filter portion 1721, the second color light L2 in the external light can enter the second sub-pixel region BB, be reflected and then emitted, so as to achieve the effect of increasing the light effect. At the same time, other lights in the external light except the second color light L2 can be filtered to improve the color purity of the light emitted from the second sub-pixel region BB, and the color gamut of the display panel 1000 can be made higher.

[0168] Exemplarily, when the second color light L2 is red light, the material of the first color filter portion 1721 can include a photoresist resin and a red dye or red pigment dispersed in the photoresist resin.

[0169] Exemplarily, the transmittance of the first color filter portion 1721 to red light is greater than or equal to 80%, such as 80%, 85%, 90%, 99%, etc.

[0170] Exemplarily, the thickness of the first color filter portion 1721 can be 1μm to 3μm, such as 1μm, 1.5μm, 2μm, 2.5μm, 3μm, etc.

[0171] By providing the second color filter portion 1722, the third color light L3 in the external light can enter the third sub-pixel region CC, be reflected and then emitted, so as to achieve the effect of increasing the light effect. At the same time, other lights in the external light except the third color light L3 can be filtered to improve the color purity of the light emitted from the third sub-pixel region CC, and the color gamut of the display panel 1000 can be made higher.

[0172] Exemplarily, when the third color light L3 is green light, the material of the second color filter portion 1722 can include a photoresist resin and a green dye or green pigment dispersed in the photoresist resin.

[0173] Exemplarily, the transmittance of the second color film portion 1722 to green light is greater than or equal to 75%, such as 75%, 80%, 90%, or 99%.

[0174] Exemplarily, the thickness of the second color film portion 1722 can be 1 μm to 3 μm, such as 1 μm, 1.6 μm, 2 μm, 2.4 μm, or 3 μm.

[0175] By providing the third color film portion 1723, the first color light L1 in the external light can enter the first sub-pixel region AA, be reflected and then emitted, achieving the effect of increasing the light efficiency. At the same time, other lights in the external light except the first color light L1 can be filtered out to improve the color purity of the light emitted from the first sub-pixel region AA, and the color gamut of the display panel 1000 can be made higher.

[0176] Exemplarily, when the first color light L1 is blue light, the material of the third color film portion 1723 can include a photoresist resin and a blue dye or a blue pigment dispersed in the photoresist resin.

[0177] Exemplarily, the transmittance of the third color film portion 1723 to blue light is greater than or equal to 70%, such as 70%, 80%, 90%, or 98%.

[0178] Exemplarily, the thickness of the third color film portion 1723 can be 1 μm to 3 μm, such as 1 μm, 1.4 μm, 2 μm, 2.6 μm, or 3 μm.

[0179] In some embodiments, as Figure 1 and Figure 6 shown, the color conversion substrate 100 further includes a first encapsulation layer 180, and the first encapsulation layer 180 is located on the side of the first color conversion portion 121, the second color conversion portion 122, and the light transmissive portion 140 away from the substrate 110. When the color conversion substrate 100 further includes a barrier pattern 160, the first encapsulation layer 180 is also located on the side of the barrier pattern 160 away from the substrate 110.

[0180] By setting it in this way, the first encapsulation layer 180 can be used to cover the first color conversion portion 121, the second color conversion portion 122, the light transmissive portion 140, and the barrier pattern 160, and wrap the first color conversion portion 121 and the second color conversion portion 122 to prevent moisture and oxygen in the external environment from entering the color conversion substrate 100 and damaging the materials of the first color conversion portion 121 (such as red quantum dot materials) and the second color conversion portion 122 (such as green quantum dot materials), resulting in a shortened lifespan of the color conversion substrate 100.

[0181] Exemplarily, the first encapsulation layer 180 may include a plurality of first sub-encapsulation layers arranged in a stacked manner, and the material of the first sub-encapsulation layer may be an organic material or an inorganic material. The organic material is, for example, an acrylate polymer material or an epoxy polymer material, etc. The inorganic material is, for example, SiOx, SiNx or Al2O3, etc.

[0182] Exemplarily, the thickness of the first encapsulation layer 180 may be 10 μm to 30 μm, such as 10 μm, 15 μm, 20 μm, 25 μm or 30 μm, etc.

[0183] Some embodiments of the present disclosure also provide a method for preparing a color conversion substrate 100, as Figure 7 shown, including S1 to S3.

[0184] S1: Provide a substrate 110.

[0185] S2: Form a cholesteric liquid crystal layer 130 on one side of the substrate 110; the cholesteric liquid crystal layer 130 includes a first cholesteric liquid crystal part 131.

[0186] S3: Form a color conversion layer 120 on the side of the cholesteric liquid crystal layer 130 away from the substrate 110; the color conversion layer 120 includes a first color conversion part 121 located on the side of the first cholesteric liquid crystal part 131 away from the substrate 110. Among them, the first color conversion part 121 is configured to: convert the first color light L1 incident on the first color conversion part 121 into a second color light L2. The first cholesteric liquid crystal part 131 is configured to: reflect the light in the first color light L1 that has not been converted back to the first color conversion part 121.

[0187] The beneficial effects achievable by the method for preparing a color conversion substrate 100 provided by some embodiments of the present disclosure are the same as those achievable by the color conversion substrate 100 provided by the above technical solution, and will not be elaborated herein.

[0188] In some embodiments, forming a cholesteric liquid crystal layer 130 on one side of the substrate 110, as Figure 8 and Figure 9 shown, includes S2.1 to S2.3.

[0189] S2.1: As Figure 9 shown, form an initial cholesteric liquid crystal layer 130a on one side of the substrate 110, and the initial cholesteric liquid crystal layer 130a includes a first initial cholesteric liquid crystal part 131a, a second initial cholesteric liquid crystal part 132a and a third initial cholesteric liquid crystal part 133a.

[0190] Exemplarily, the process of forming the initial cholesteric liquid crystal layer 130a is a coating process.

[0191] Exemplarily, the material for forming the initial cholesteric liquid crystal layer 130a is a precursor. The precursor includes, for example, a liquid crystal monomer, a chiral additive, and a photoinitiator.

[0192] Exemplarily, in the precursor, the mass ratio of the liquid crystal monomer can be 85% - 95%, such as 85%, 88%, 90%, 92%, or 95%.

[0193] Exemplarily, in the precursor, the mass ratio of the chiral additive can be 2% - 5%, such as 2%, 3%, 4%, 4.5%, or 5%.

[0194] Exemplarily, in the precursor, the mass ratio of the photoinitiator can be 1% - 5%, such as 1%, 2%, 3%, 4%, or 5%.

[0195] Exemplarily, the liquid crystal monomer can be selected from any one of the structures shown in the following general formula (I).

[0196]

[0197] Among them, R1 and R2 are the same or different, and are independently selected from polymerizable functional groups, such as acrylate groups, vinyl ether groups, thiol groups, or epoxy groups, etc. L1, L 21 , L 22 , L 23 , L3 are the same or different, and are independently selected from C0 - C20 alkyl groups and alkyl groups containing heteroatoms such as N, O, S, etc., to achieve the function of the bridging chain. A, B, C are the same or different, and are independently selected from any one of aryl groups, heteroaryl groups, and cycloalkanes; the aryl group is, for example, a phenyl group, a naphthyl group, or a biphenyl group. m, n, p are the same or different, and are independently selected from any one of 0, 1, 2, 3, 4, and 5.

[0198] Exemplarily, the structure of the liquid crystal monomer can be the structure shown in the structural formula (II).

[0199]

[0200] Exemplarily, the structure of the photoinitiator can be the structure shown in the structural formula (III).

[0201]

[0202] It should be noted that the above-listed structural formulas are examples of the structures of the liquid crystal monomer and the photoinitiator, and are not limitations on the liquid crystal monomer and the photoinitiator. Moreover, (I), (II), and (III) in the above structural formulas are designations of the structural formulas and are not part of the structural formula structure.

[0203] S2.2: As Figure 9As shown, the first initial cholesteric liquid crystal part 131a is formed into the first cholesteric liquid crystal part 131, and the second initial cholesteric liquid crystal part 132a is formed into the second cholesteric liquid crystal part 132.

[0204] In some examples, forming the first initial cholesteric liquid crystal part 131a into the first cholesteric liquid crystal part 131 and forming the second initial cholesteric liquid crystal part 132a into the second cholesteric liquid crystal part 132 includes S2.2.1 to S2.2.3.

[0205] S2.2.1: As Figure 9 shown, a mask plate is placed above the initial cholesteric liquid crystal layer 130a to expose the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a.

[0206] S2.2.2: As Figure 9 shown, the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a are cured by ultraviolet light irradiation to form the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132.

[0207] Using the above process, the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a irradiated with ultraviolet light can undergo a curing reaction to form the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 containing planar cholesteric liquid crystal. Among them, the liquid crystal molecules in the region not irradiated with ultraviolet light (for example, the third initial cholesteric liquid crystal part 133a) are still in the planar cholesteric liquid crystal state of small molecules and do not undergo a curing reaction.

[0208] Exemplarily, the intensity of ultraviolet light irradiation can be 0.5 mW / cm 2 ~10.0 mW / cm 2 , for example, 0.5 mW / cm 2 , 2.0 mW / cm 2 , 4.0 mW / cm 2 , 6.0 mW / cm 2 , 8.0 mW / cm 2 or 10.0 mW / cm 2 .

[0209] Exemplarily, the time of ultraviolet light irradiation can be 2 min to 30 min, for example, 2 min, 10 min, 15 min, 20 min, 25 min or 30 min.

[0210] S2.2.3: Remove the mask plate.

[0211] S2.3: As Figure 9As shown, the third initial cholesteric liquid crystal part 133a is formed into the third cholesteric liquid crystal part 133.

[0212] In some examples, forming the third initial cholesteric liquid crystal part 133a into the third cholesteric liquid crystal part 133 includes S2.3.1 to S2.3.2.

[0213] S2.3.1: Heat the third initial cholesteric liquid crystal part 133a so that the temperature of the third initial cholesteric liquid crystal part 133a is higher than the clearing point of the liquid crystal molecules.

[0214] Using the above process, the helical axis of the cholesteric liquid crystal in the third initial cholesteric liquid crystal part 133a can be made isotropic to form a focal conic state cholesteric liquid crystal.

[0215] Exemplarily, heat the third initial cholesteric liquid crystal part 133a to 120 °C to 150 °C, such as 120 °C, 125

[0216] °C, 130 °C, 135 °C, 140 °C, 145 °C or 150 °C so that the temperature of the third initial cholesteric liquid crystal part 133a is higher than the clearing point of the liquid crystal molecules.

[0217] S2.3.2: Cool the third initial cholesteric liquid crystal part 133a under ultraviolet light irradiation conditions to solidify the third initial cholesteric liquid crystal part 133a to form the third cholesteric liquid crystal part 133.

[0218] Using the above process, the third initial cholesteric liquid crystal part 133a irradiated with ultraviolet light can undergo a curing reaction to form the third cholesteric liquid crystal part 133 containing a focal conic state cholesteric liquid crystal.

[0219] Exemplarily, the cooling rate of the third initial cholesteric liquid crystal part 133a can be 0.5 °C / min to 10.0 °C / min, such as 0.5 °C / min, 2.0 °C / min, 4.0 °C / min, 6.0 °C / min, 8.0 °C / min or 10.0 °C / min.

[0220] Exemplarily, the intensity of ultraviolet light irradiation can be 0.5 mW / cm 2 ~10.0 mW / cm 2 such as 0.5 mW / cm 2 、1.5 mW / cm 2 、4.0 mW / cm 2 、6.5 mW / cm 2 、8.0 mW / cm 2 or 10.0 mW / cm 2 .

[0221] It should be noted that Figure 9A simplified schematic diagram obtained after removing other film layers in the color conversion substrate 100 except for the film layers related to the cholesteric liquid crystal layer 130.

[0222] In some embodiments, as Figure 9 shown, before forming the cholesteric liquid crystal layer 130 on one side of the substrate 110, it further includes forming an alignment layer 150 on one side of the substrate 110. The process of forming the alignment layer 150 is, for example, first forming an initial alignment layer 150, and then performing photo-alignment treatment on the initial alignment layer 150. Among them, the process of forming the initial alignment layer 150 is, for example, a coating process.

[0223] As Figure 6 shown, the alignment layer 150 includes a first alignment portion 151, a second alignment portion 152, and a third alignment portion 153 arranged along the first direction X. The first alignment portion 151 is configured to align the liquid crystal molecules in the first cholesteric liquid crystal portion 131. The second alignment portion 152 is configured to align the liquid crystal molecules in the second cholesteric liquid crystal portion 132. The third alignment portion 153 is configured to align the liquid crystal molecules in the third cholesteric liquid crystal portion 133.

[0224] In some embodiments, the first cholesteric liquid crystal portion 131 includes a first chiral liquid crystal portion 1311 and a second chiral liquid crystal portion 1312, and the second cholesteric liquid crystal portion 132 includes a third chiral liquid crystal portion 1321 and a fourth chiral liquid crystal portion 1322. In this case, forming the cholesteric liquid crystal layer 130 on one side of the substrate 110 includes R1 to R6.

[0225] R1: Forming a first sub-layer in the initial cholesteric liquid crystal layer 130a on one side of the substrate 110. The first sub-layer in the initial cholesteric liquid crystal layer 130a includes a first sub-portion of the first initial cholesteric liquid crystal portion 131a, a first sub-portion of the second initial cholesteric liquid crystal portion 132a, and a first sub-portion of the third initial cholesteric liquid crystal portion 133a.

[0226] Regarding the description of the forming process and materials (such as liquid crystal monomers, chiral additives, photoinitiators) in step R1, reference can be made to the description of step S2.1 in steps S2.1 to S2.3 in the foregoing method, and details will not be repeated here.

[0227] Exemplarily, in the material for forming the first sub-layer of the initial cholesteric liquid crystal layer 130a, the chiral additive is a first chiral additive, which can be the structure shown in formula (IV).

[0228]

[0229] R2: Form the first sub - part of the first initial cholesteric liquid crystal part 131a into the first chiral liquid crystal part 1311, and form the first sub - part of the second initial cholesteric liquid crystal part 132a into the third chiral liquid crystal part 1321.

[0230] For the description of the formation process in step R2, reference can be made to the description of step S2.2 in steps S2.1 - S2.3 of the foregoing method, which will not be elaborated here.

[0231] R3: Form the first sub - part of the third initial cholesteric liquid crystal part 133a into the first sub - part of the third cholesteric liquid crystal part 133.

[0232] For the description of the formation process in step R3, reference can be made to the description of step S2.3 in steps S2.1 - S2.3 of the foregoing method, which will not be elaborated here.

[0233] R4: Form the second sub - layer in the initial cholesteric liquid crystal layer 130a on one side of the first chiral liquid crystal part 1311, the third chiral liquid crystal part 1321, and the first sub - part of the third cholesteric liquid crystal part 133. The second sub - layer in the initial cholesteric liquid crystal layer 130a includes the second sub - part of the first initial cholesteric liquid crystal part 131a, the second sub - part of the second initial cholesteric liquid crystal part 132a, and the second sub - part of the third initial cholesteric liquid crystal part 133a.

[0234] For the description of the formation process and materials (such as liquid crystal monomers, chiral additives, photoinitiators) in step R4, reference can be made to the description of step S2.1 in steps S2.1 - S2.3 of the foregoing method, which will not be elaborated here.

[0235] Exemplarily, among the materials for forming the second sub - layer of the initial cholesteric liquid crystal layer 130a, the chiral additive is the second chiral additive, which can have the structure shown in structural formula (V).

[0236]

[0237] It should be noted that the above - listed structural formulas are examples of the structures of the first chiral additive and the second chiral additive, and are not limitations on the first chiral additive and the second chiral additive. Moreover, (IV) and (V) in the above - mentioned structural formulas are designations of the structural formulas and are not part of the structure of the structural formulas.

[0238] R5: Form the second sub - part of the first initial cholesteric liquid crystal part 131a into the second chiral liquid crystal part 1312, and form the second sub - part of the second initial cholesteric liquid crystal part 132a into the fourth chiral liquid crystal part 1322.

[0239] For the description of the formation process in step R5, reference can be made to the description of step S2.2 in steps S2.1 - S2.3 of the foregoing method, which will not be elaborated here.

[0240] R6: Form the second sub - portion of the third cholesteric liquid crystal part 133 from the second sub - portion of the third initial cholesteric liquid crystal part 133a.

[0241] For the description of the forming process in step R6, reference can be made to the description of step S2.3 in steps S2.1 - S2.3 in the foregoing method, and details are not repeated here.

[0242] It should be noted that the first sub - portion and the second sub - portion of the above - mentioned third cholesteric liquid crystal part 133 together constitute the third cholesteric liquid crystal part 133.

[0243] Some embodiments of the present disclosure also provide a display panel 1000. As Figure 1 and Figure 6 shown, the display panel 1000 includes: a color conversion substrate 100 and a light - emitting substrate 200 as described in any of the above embodiments. The light - emitting substrate 200 is opposite to the color conversion substrate 100; the light - emitting substrate 200 is configured to emit first - color light L1.

[0244] The above - mentioned light - emitting substrate 200 emits first - color light L1, for example, blue light. By opposing the light - emitting substrate 200 to the color conversion substrate 100 in any of the above embodiments, the color conversion substrate 100 can convert the first - color light L1 emitted from the light - emitting substrate 200 in the second sub - pixel region BB and the third sub - pixel region CC into second - color light L2 (for example, red light) and third - color light L3 (for example, green light) respectively. After mixing the second - color light L2, the third - color light L3, and the first - color light L1 emitted from the first sub - pixel region AA, full - color display of the display panel 1000 is achieved.

[0245] The beneficial effects achievable by a display panel 1000 provided by some embodiments of the present disclosure are the same as those achievable by a color conversion substrate 100 provided by the above - mentioned technical solution, and details are not repeated here.

[0246] In some embodiments, as Figure 1 and Figure 6 shown, the display panel 1000 further includes a filling layer 300 located between the light - emitting substrate 200 and the color conversion substrate 100.

[0247] By providing a filling layer 300 between the light - emitting substrate 200 and the color conversion substrate 100, the cell gap between the color conversion substrate 100 and the display substrate can be filled, and the light - emitting substrate 200 and the color conversion substrate 100 can be bonded together.

[0248] Exemplarily, the material of the filling layer 300 is an acrylate - based polymer material or an epoxy - based polymer material, etc.

[0249] Exemplarily, the thickness of the filling layer 300 can be 10 μm to 20 μm, such as 10 μm, 12 μm, 15 μm, 18 μm, or 20 μm, etc.

[0250] In some embodiments, the light-emitting substrate 200 includes any one of an OLED light-emitting substrate 200, an LED (Light Emitting Diode) light-emitting substrate 200, a Micro LED light-emitting substrate 200, and a Mini LED light-emitting substrate 200.

[0251] Based on the above light-emitting substrate 200, the display panel 1000 can be any product or component with a display function, such as an OLED panel, an OLED TV, a Micro LED panel, a Micro LED TV, a Mini LED panel, a Mini LED TV, a monitor, a mobile phone, a navigator, etc. The above display panel 1000 can be any display panel 1000 that displays whether it is moving (e.g., video) or stationary (e.g., still image), and whether it is text or image. More specifically, it is expected that the display panel 1000 of the embodiments can be implemented and applied in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, video cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rear-view cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0252] In some embodiments, as Figure 1 and Figure 6 shown, the light-emitting substrate 200 is an OLED light-emitting substrate 200; the OLED light-emitting substrate 200 includes: a cathode 220 and an anode 210 disposed opposite to each other, and at least two light-emitting units 230 disposed between the cathode 220 and the anode 210. The light-emitting unit 230 includes a light-emitting layer 231, and the light-emitting layer 231 is configured to: emit first-color light L1 to the color conversion substrate 100.

[0253] When the material of the first color conversion part 121 includes a first quantum dot material and the material of the second color conversion part 122 includes a second quantum dot material, and the light-emitting substrate 200 is an OLED light-emitting substrate 200, the display panel 1000 is a quantum dot (QD)-organic light-emitting diode device (QD-OLED). An OLED light-emitting substrate 200 that emits first color light L1 (for example, blue light) can be used as an excitation light source, and the first color conversion part 121 containing the first quantum dot material (for example, a red quantum dot material) and the second color conversion part 122 containing the second quantum dot material (for example, a green quantum dot material) are used as the color conversion layer 120 (Color Conversion Layer, CCL). At this time, the display panel 1000 can take into account the advantages of high brightness, high color volume, and high efficiency of quantum dots, and combine the advantages of a true black state, high contrast, wide viewing angle, and wide color gamut of OLED devices, achieving excellent display effects and having the advantages of a wide color gamut, high color conversion efficiency (Color Conversion Efficiency, CCE), and wide viewing angle.

[0254] The above OLED light-emitting substrate 200 includes a cathode 220 and an anode 210. During operation, voltages are applied to the anode 210 and the cathode 220 respectively to generate an electric field therebetween, which can drive holes in the anode 210 and electrons in the cathode 220 to recombine in the light-emitting layer 231, thereby emitting the first color light L1.

[0255] In some embodiments, the material of the light-emitting layer 231 includes a guest material, and the guest material is configured to emit the first color light L1.

[0256] Exemplarily, the guest material can be one or more of a fluorescent material, a phosphorescent material, and a thermally activated delayed fluorescence material. Among them, the fluorescent material is, for example, DCM, DCJ, Alq3, or DPVPi, etc.; the phosphorescent material is, for example, Pt7O7, PtOEP, FirPic, or Ir(ppy)3, etc., and the thermally activated delayed fluorescence material is, for example, DACR-DPTX, TPA-DMAC, or 4CzIPN, etc.

[0257] Exemplarily, the wavelength of the first color light L1 emitted by the light-emitting layer 231 can be 450 nm to 470 nm, for example, 450 nm, 455 nm, 460 nm, 465 nm, or 470 nm, etc. At this time, the first color light L1 is blue light.

[0258] Exemplarily, the full width at half maximum of the emission spectrum of the first color light L1 emitted by the light-emitting layer 231 is 15 nm to 30 nm, for example, 15 nm, 20 nm, 25 nm, or 30 nm, etc. Thus, the color purity of the first color light L1 emitted by the light-emitting substrate 200 can be improved.

[0259] In some embodiments, the light-emitting unit 230 further includes a hole transport functional layer disposed between the light-emitting layer 231 and the anode 210, and / or an electron transport functional layer disposed between the light-emitting layer 231 and the cathode 220. The hole transport functional layer includes, for example, at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. Thus, the hole transport performance can be improved. The electron transport functional layer includes, for example, at least one of an electron injection layer, an electron transport layer, and a hole blocking layer. Thus, the electron transport performance can be improved.

[0260] In some examples, as Figure 1 and Figure 6 shown, the anode 210 can be located on the side of the light-emitting unit 230 away from the color conversion substrate 100, and the cathode 220 can be located on the side of the light-emitting unit 230 close to the color conversion substrate 100. At this time, the anode 210, at least two light-emitting units 230, and the cathode 220 are stacked along the second direction Y, and the anode 210, at least two light-emitting units 230, and the cathode 220 are arranged in sequence along the direction close to the color conversion substrate 100. In some other examples, the cathode 220 can be located on the side of the light-emitting unit 230 away from the color conversion substrate 100, and the anode 210 can be located on the side of the light-emitting unit 230 close to the color conversion substrate 100.

[0261] The above-mentioned light-emitting substrate 200 includes at least two light-emitting units 230 (for example, including n light-emitting units 230), and is a stacked light-emitting substrate 200. By setting it in this way, on the one hand, since OLED is current-driven to emit light, under the drive of the same current density, the luminous brightness of the stacked OLED light-emitting substrate 200 composed of n identical light-emitting units 230 is n times that of the traditional OLED light-emitting substrate 200 composed of a single light-emitting unit 230. Therefore, the current efficiency of the stacked OLED light-emitting substrate 200 is n times that of the traditional OLED light-emitting substrate 200. On the other hand, the OLED light-emitting substrate 200 operates at a certain brightness. Under the same luminous brightness, the current density for driving the stacked OLED light-emitting substrate 200 is 1 / n of the current density for driving the traditional OLED light-emitting substrate 200. Since the greater the current density for driving the OLED light-emitting substrate 200, the faster the OLED light-emitting substrate 200 ages and the shorter its lifespan, the lifespan of the stacked OLED light-emitting substrate 200 will be extended.

[0262] In some embodiments, as Figure 1 andFigure 6 As shown, the light-emitting substrate 200 further includes a charge generation layer 240, and the charge generation layer 240 is located between two adjacent light-emitting units 230 among the plurality of light-emitting units 230.

[0263] Through the above charge generation layer 240, the plurality of light-emitting units 230 can be sequentially connected in the vertical direction of the light-emitting surface (for example, the second direction Y). Moreover, the charge generation layer 240 not only plays a role in connecting the light-emitting units 230 in the stacked OLED light-emitting substrate 200, but also helps to improve the generation efficiency of charges (holes or electrons), and can significantly affect the performance of the light-emitting substrate 200.

[0264] Exemplarily, the charge generation layer 240 may include a plurality of inorganic material layers arranged in a stacked manner, such as Li / Ca / Ag, LiF / Al / Au, or Al / WO3 / Au, etc. Or, the charge generation layer 240 may include an inorganic material layer and an organic material layer arranged in a stacked manner, such as Alq3(Bphen):Li, Alq3(BCP):Li, Bphen:Rb2CO3, or LiF / ZnPc:C 60 / MoO3, etc. Or, the charge generation layer 240 may include a plurality of organic material layers arranged in a stacked manner, such as Alq3:Li / HAT-CN, Bphen:Li / HAT-CN, F 16 CuPc / CuPc, or Li:Bphen / Al / F4-TCNQ / HAT-CN, etc.

[0265] Exemplarily, the charge generation layer 240 (CGL) may include an electron generation layer (n-CGL) and a hole generation layer (p-CGL) arranged in a stacked manner. Among them, the electron generation layer is closer to the anode 210 than the hole generation layer.

[0266] In some embodiments, as Figure 1 and Figure 6 shown, the light-emitting substrate 200 further includes a second encapsulation layer 250. When the cathode 220 is closer to the color conversion substrate 100 than the anode 210, the second encapsulation layer 250 may be located on the side of the cathode 220 away from the light-emitting units 230.

[0267] By setting it in this way, the second encapsulation layer 250 can be used to cover and wrap the light-emitting units 230, so as to prevent water vapor and oxygen in the external environment from entering the light-emitting units 230 and damaging the materials of the light-emitting units 230 (such as the guest material), resulting in a shortened lifespan of the light-emitting substrate 200.

[0268] Exemplarily, the second encapsulation layer 250 may include a plurality of second sub-encapsulation layers stacked on top of each other. The material of the second sub-encapsulation layer may be an organic material or an inorganic material. The organic material may be, for example, an acrylate-based polymer material or an epoxy-based polymer material. The inorganic material may be, for example, SiOx or SiNx. Among them, the thickness of the second sub-encapsulation layer containing the organic material may be 6 μm to 12 μm, such as 6 μm, 7 μm, 9 μm, 11 μm, or 12 μm. The thickness of the second sub-encapsulation layer containing the inorganic material may be 0.4 μm to 1.6 μm, such as 0.4 μm, 0.8 μm, 1.2 μm, or 1.6 μm.

[0269] In some examples, the light-emitting substrate further includes a driving circuit disposed on the side of the anode 210 away from the light-emitting unit. The driving circuit can generate a driving current. The light-emitting substrate can emit light under the driving action of the driving current generated by the driving circuit.

[0270] In order to objectively evaluate the technical effects of the embodiments of the present disclosure, hereinafter, the technical solutions provided by the present disclosure will be described in detail and exemplarily through the following experimental examples and comparative examples.

[0271] In the following embodiments, as Figure 6 shown, the display panel 1000 includes a color conversion substrate 100, a light-emitting substrate 200, and a filling layer 300 disposed therebetween. Among them, the color conversion substrate 100 includes a substrate 110, a first color film portion 1721, a second color film portion 1722, a third color film portion 1723, a light absorption pattern 171, a blocking pattern 160, an alignment layer 150, a first cholesteric liquid crystal portion 131, a second cholesteric liquid crystal portion 132, a third cholesteric liquid crystal portion 133, a first color conversion portion 121, a second color conversion portion 122, a light-transmitting portion 140, and a first encapsulation layer 180. Among them, the material of the first color conversion portion 121 is a red quantum dot material, and the material of the second color conversion portion 122 is a green quantum dot material. The light-emitting substrate 200 is a stacked light-emitting substrate 200, and the number of light-emitting units 230 is three. Specifically, the light-emitting substrate 200 includes a stacked backplane (including the anode 210), a first light-emitting unit 230, a first charge generation layer 240, a second light-emitting unit 230, a second charge generation layer 240, a third light-emitting unit 230, a cathode 220, and a second encapsulation layer 250. Among them, the first color light L1 emitted by the first light-emitting unit 230, the second light-emitting unit 230, and the third light-emitting unit 230 is blue light. For the description of the position, connection, material, shape, etc. of the above structure, reference can be made to the description of the above embodiments, which will not be repeated here.

[0272] In the following comparative examples, as Figure 10As shown, compared with the above embodiments, the structural difference is only that the alignment layer 150, the first cholesteric liquid crystal part 131, the second cholesteric liquid crystal part 132, and the third cholesteric liquid crystal part 133 are not provided.

[0273] In the following embodiments and comparative examples, the third cholesteric liquid crystal part 133 is prepared using different intensities of ultraviolet light irradiation. Moreover, the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 have different thicknesses and structures, and the blue light leakage rate (Blue leakage), color conversion efficiency (CCE), color gamut, color shift, and power consumption of the display panel 1000 are compared using an optoelectronic test system. In the following comparative examples and embodiments, the test conditions of the display panel 1000 are the same.

[0274] Example 1

[0275] Prepare the display panel 1000, including P1 to P9.

[0276] P1: Provide the substrate 110.

[0277] P2: Use coating and photolithography processes to form a light-absorbing pattern 171 on one side of the substrate 110. The light-absorbing pattern 171 includes a plurality of second openings N.

[0278] P3: Use coating and photolithography processes to form a first color film part 1721, a second color film part 1722, and a third color film part 1723 in the plurality of second openings N, thereby forming a light-blocking layer 170.

[0279] P4: Use coating and photolithography processes to form a blocking pattern 160 on the side of the light-blocking layer 170 away from the substrate 110. The blocking pattern 160 includes a plurality of first openings Q.

[0280] P5: Coat the material of the initial alignment layer 150 on the side of the blocking pattern 160 away from the light-blocking layer 170 to form the initial alignment layer 150, and perform photo-alignment treatment on the initial alignment layer 150 to form the alignment layer 150 located in the second openings N.

[0281] P6: Refer to the methods of R1 to R6 above to prepare the cholesteric liquid crystal layer 130 on the side of the alignment layer 150 away from the light-blocking layer 170.

[0282] Among them, in R1 and R4, the precursor includes a liquid crystal monomer, a chiral additive, and a photoinitiator, and the mass ratio of the three is 93:3:4. The structure of the liquid crystal monomer is the structure shown in Structural Formula (II); the structure of the photoinitiator is the structure shown in Structural Formula (III). In R1, the structure of the chiral additive is the structure shown in Structural Formula (IV), and the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm; in R4, the structure of the chiral additive is the structure shown in Structural Formula (V), and the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm.

[0283] In R2 and R5, the intensity of ultraviolet light irradiation of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 7 mW / cm 2 , and the time of ultraviolet light irradiation of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 5 min. In R3 and R6, the heating temperature of the third initial cholesteric liquid crystal part 133a is 140 °C, the cooling rate of the third initial cholesteric liquid crystal part 133a is 3 °C / min, and the intensity of ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a is 3.0 mW / cm 2 .

[0284] P7: A first color conversion part 121 is formed on the side of the first cholesteric liquid crystal part 131 away from the alignment layer 150 by using coating and photolithography processes; a second color conversion part 122 is formed on the side of the second cholesteric liquid crystal part 132 away from the alignment layer 150 by using coating and photolithography processes; a light-transmitting part 140 is formed on the side of the third cholesteric liquid crystal part 133 away from the alignment layer 150 by using coating and photolithography processes.

[0285] P8: A first encapsulation layer 180 is formed on the side of the first color conversion part 121, the second color conversion part 122, and the light-transmitting part 140 away from the cholesteric liquid crystal layer 130 by using coating and photolithography processes; the material of the first encapsulation layer 180 is an inorganic material.

[0286] P9: The color conversion substrate 100 is bonded to the light-emitting substrate 200 by using a cell bonding process.

[0287] After forming the first chiral liquid crystal part 1311, the third chiral liquid crystal part 1321, and the first sub-part of the third cholesteric liquid crystal part 133 in P6, the microscopic morphology of the first cholesteric liquid crystal part 131 was measured, and the results are as Figure 11 shown; the polarizing microscope texture of the first cholesteric liquid crystal part 131 was measured, and the results are as Figure 12 shown; the transmission spectrum of the first cholesteric liquid crystal part 131 was measured, and the results are as Figure 13 shown, and the microscopic morphology of the third cholesteric liquid crystal part 133 was measured, and the results are asFigure 14 As shown; the polarizing microscope texture of the third cholesteric liquid crystal part 133 was measured, and the results are as Figure 15 shown. Among them, Figure 11 , Figure 14 was measured using a scanning electron microscope of model S-4800, and the test voltage was 5 kV.

[0288] After P9, in the display panel 1000, the angular light intensity distributions of the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC were measured, and the results are as Figure 16 shown.

[0289] Example 2

[0290] Referring to the methods of P1 to P9 above, the display panel 1000 was prepared. Among them, except for the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a, the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a, and the intensity of the ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a, the preparation conditions were the same as those in Example 1.

[0291] In this example, the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a was 1.0 μm; the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a was 1.0 μm. The intensity of the ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a was 3.0 mW / cm 2 .

[0292] Example 3

[0293] Referring to the methods of P1 to P9 above, the display panel 1000 was prepared. Among them, except for the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a, the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a, and the intensity of the ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a, the preparation conditions were the same as those in Example 1.

[0294] In this example, the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a was 2.0 μm; the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a was 2.0 μm. The intensity of the ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a was 3.0 mW / cm 2 .

[0295] Example 4

[0296] Referring to the methods of P1 to P9 above, the display panel 1000 was prepared. Among them, except for the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a, the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a, and the intensity of the ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a, the preparation conditions were the same as those in Example 1.

[0297] In this embodiment, the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm; the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm. The intensity of ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a is 1.0 mW / cm 2 。

[0298] Example 5

[0299] Referring to the methods of P1 to P9 above, a display panel 1000 is prepared. Among them, except for the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a, the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a, and the intensity of ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a, the preparation conditions are the same as those in Example 1.

[0300] In this embodiment, the thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm; the thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a is 1.5 μm. The intensity of ultraviolet light irradiation of the third initial cholesteric liquid crystal part 133a is 5.0 mW / cm 2 。

[0301] Example 6

[0302] Referring to the methods of P1 to P9 above, a display panel 1000 is prepared. Among them, except for part P6, the preparation conditions are the same as those in Example 1.

[0303] In this embodiment, P6: Referring to the methods of R1 to R3 above, a cholesteric liquid crystal layer 130 is prepared on the side of the alignment layer 150 away from the light-blocking layer 170. That is to say, in the cholesteric liquid crystal layer 130 prepared in P6 of this embodiment, the first cholesteric liquid crystal part 131 only includes the first chiral liquid crystal layer, the second cholesteric liquid crystal part 132 only includes the third chiral liquid crystal layer, and the third cholesteric liquid crystal part 133 only includes the first sub-part of the third cholesteric liquid crystal part 133.

[0304] Among them, in R1, the precursor includes a liquid crystal monomer, a chiral additive, and a photoinitiator, and the mass ratio of the three is 93:3:4. The structure of the liquid crystal monomer is the structure shown in structural formula (II); the structure of the photoinitiator is the structure shown in structural formula (III), and the structure of the chiral additive is the structure shown in structural formula (IV). The thickness of the first sub-layer of the initial cholesteric liquid crystal layer 130a is 3.0 μm.

[0305] In R2, the intensity of ultraviolet light irradiation of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 7 mW / cm 2, the ultraviolet light irradiation time of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 5 min. In R3, the heating temperature of the third initial cholesteric liquid crystal part 133a is 140 °C, the cooling rate of the third initial cholesteric liquid crystal part 133a is 3 °C / min, and the ultraviolet light irradiation intensity of the third initial cholesteric liquid crystal part 133a is 3.0 mW / cm 2 .

[0306] Example 7

[0307] Referring to the methods of P1 to P9 above, the display panel 1000 was prepared. Among them, except for the P6 part, the preparation conditions were the same as those in Example 1.

[0308] In this embodiment, P6: Referring to the methods of R4 to R6 above, a cholesteric liquid crystal layer 130 was prepared on the side of the alignment layer 150 away from the light-blocking layer 170. That is, in this embodiment, in the cholesteric liquid crystal layer 130 prepared in P6, the first cholesteric liquid crystal part 131 only includes the second chiral liquid crystal layer, the second cholesteric liquid crystal part 132 only includes the fourth chiral liquid crystal layer, and the third cholesteric liquid crystal part 133 only includes the second sub-part of the third cholesteric liquid crystal part 133.

[0309] Among them, in R4, the precursor includes a liquid crystal monomer, a chiral additive, and a photoinitiator, and the mass ratio of the three is 93:3:4. The structure of the liquid crystal monomer is the structure shown in structural formula (II); the structure of the photoinitiator is the structure shown in structural formula (III), and the structure of the chiral additive is the structure shown in structural formula (V). The thickness of the second sub-layer of the initial cholesteric liquid crystal layer 130a is 3.0 μm.

[0310] In R5, the ultraviolet light irradiation intensity of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 7 mW / cm 2 , the ultraviolet light irradiation time of the first initial cholesteric liquid crystal part 131a and the second initial cholesteric liquid crystal part 132a is 5 min. In R6, the heating temperature of the third initial cholesteric liquid crystal part 133a is 140 °C, the cooling rate of the third initial cholesteric liquid crystal part 133a is 3 °C / min, and the ultraviolet light irradiation intensity of the third initial cholesteric liquid crystal part 133a is 3.0 mW / cm 2 .

[0311] Comparative Example

[0312] Referring to the methods of P1 to P4, P7 to P9 above, the display panel 1000 was prepared. Among them, P7 is to form the first color conversion part 121, the second color conversion part 122, and the light-transmitting part 140 in a plurality of second openings N by coating and photolithography processes. That is, in the comparative example, the color conversion substrate 100 does not include the cholesteric liquid crystal layer 130.

[0313] In this comparative example, after P9, the angular intensity distribution of the first sub-pixel region AA in the display panel 1000 was measured, and the results are as Figure 16 shown and compared with the angular intensity distribution measured in Example 1.

[0314] Compared with Example 1, it can be seen from Figure 16 that, compared with the angular intensity distribution of the blue light emitted from the first sub-pixel region AA in the comparative example, the angular intensity distribution of the blue light emitted from the first sub-pixel region AA in Example 1 is closer to the angular intensity distribution of the red light emitted from the second sub-pixel region BB and the angular intensity distribution of the green light emitted from the third sub-pixel region CC. This is because in Example 1, a third cholesteric liquid crystal portion 133 is provided between the substrate 110 and the light-transmitting portion 140, and the cholesteric liquid crystal in the third cholesteric liquid crystal portion 133 is in a focal conic state, which can disperse the part of the first color light L1 near the positive viewing angle towards the large viewing angle direction. Compared with the comparative example, the angular distribution of the first color light L1 emitted from the first sub-pixel region AA is relatively wide, which can improve the matching of the angular distributions of the light rays emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC, and can alleviate the problem of angular color shift.

[0315] Based on the above Example 1 to Example 7 and the comparative example, using an optoelectronic test system, the blue light leakage rate (Blue leakage), color conversion efficiency (CCE), color gamut, color shift, and power consumption of the display panel 1000 of Example 1 to Example 7 and the comparative example were measured. Among them, the data results of the blue light leakage rate (Blueleakage), color conversion efficiency (CCE), color gamut, color shift, and power consumption are referenced to the comparative example, and the test results are shown in Table 1 below. The test results are shown in Table 1 below.

[0316] Table 1

[0317]

[0318]

[0319] It should be noted that the blue light leakage rate in Table 1 is the average value of the blue light leakage rates of the light rays emitted from the second sub-pixel region BB and the third sub-pixel region CC. The color conversion efficiency in Table 1 is the average value of the color conversion efficiencies of the first color conversion portion 121 and the second color conversion portion 122. The color gamut in Table 1 is determined based on the CIE 1931 chromaticity diagram. The color shift in Table 1 is the result measured at a measurement viewing angle of 45°.

[0320] In Examples 1 to 7 compared with the Comparative Examples, referring to Table 1, the blue light leakage rates of Examples 1 to 7 are lower, the color conversion efficiency is higher, the color gamut is wider, and the power consumption is lower. This is because in the color conversion substrate 100 of Examples 1 to 7, a first cholesteric liquid crystal part 131 is provided between the substrate 110 and the first color conversion part 121, and a second cholesteric liquid crystal part 132 is provided between the substrate 110 and the second color conversion part 122, and the cholesteric liquid crystals in the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 are in a planar state, so that the first color light L1 that passes through the first color conversion part 121 and the second color conversion part 122 but is not converted can be reflected back to the first color conversion part 121 and the second color conversion part 122 by the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132, exciting the color conversion materials in the first color conversion part 121 and the second color conversion part 122 and being converted into the second color light L2 and the third color light L3. In this way, first, the first color light L1 leaking from the second sub-pixel region BB and the third sub-pixel region CC can be reduced, so that the blue light leakage rate is lower. Second, the reflected first color light L1 can re-enter the first color conversion part 121 and the second color conversion part 122, exciting the color conversion materials in the first color conversion part 121 and the second color conversion part 122 and being converted into the second color light L2 and the third color light L3, so that the color conversion efficiency can be improved and the power consumption of the display panel 1000 can be reduced. Third, the color purity of the display panel 1000 can be improved, and the crosstalk caused by the leaking first color light L1 entering the adjacent sub-pixel region can be avoided, so that the color gamut of the display panel 1000 can be broadened.

[0321] Comparing Examples 1 to 5 with Examples 6 to 7, referring to Table 1, the blue light leakage rate of Examples 1 to 5 is relatively low, the color conversion efficiency is relatively high, the color gamut is relatively wide, and the power consumption is relatively low. This is because in the color conversion substrate 100 of Examples 1 to 5, the first cholesteric liquid crystal part 131 includes a first chiral liquid crystal part 1311 and a second chiral liquid crystal part 1312 with opposite helical directions, and the second cholesteric liquid crystal part 132 includes a third chiral liquid crystal part 1321 and a fourth chiral liquid crystal part 1322 with opposite helical directions. In this way, for the part of the first color light L1 whose helical direction is the same as the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 and the third chiral liquid crystal part 1321, it can be reflected back to the first color conversion part 121 and the second color conversion part 122 by the first chiral liquid crystal part 1311 and the third chiral liquid crystal part 1321, and be converted into the second color light L2 and the third color light L3. At the same time, for the part of the first color light L1 whose helical direction is opposite to the helical direction of the liquid crystal molecules in the first chiral liquid crystal part 1311 and the third chiral liquid crystal part 1321, it can be reflected back to the first color conversion part 121 and the second color conversion part 122 by the second chiral liquid crystal part 1312 and the fourth chiral liquid crystal part 1322, and be converted into the second color light L2 and the third color light L3. In this way, the reflection ability of the first cholesteric liquid crystal part 131 and the second cholesteric liquid crystal part 132 to the first color light L1 can be improved. First, the first color light L1 leaking from the second sub-pixel region BB and the third sub-pixel region CC can be reduced, so that the blue light leakage rate is relatively low. Second, the reflected first color light L1 can re-enter the first color conversion part 121 and the second color conversion part 122, stimulate the color conversion materials in the first color conversion part 121 and the second color conversion part 122, and be converted into the second color light L2 and the third color light L3, so that the color conversion efficiency can be improved, and the power consumption of the display panel 1000 can be reduced. Third, the color purity of the display panel 1000 can be improved, preventing the leaked first color light L1 from entering the adjacent sub-pixel region and causing crosstalk, so that the color gamut of the display panel 1000 can be broadened.

[0322] Comparing Examples 1 to 7 with the comparative example, referring to Table 1, the color shift of Examples 1 to 7 is relatively low. This is because in Examples 1 to 7, a third cholesteric liquid crystal part 133 is provided between the substrate 110 and the light-transmitting part 140, and the cholesteric liquid crystal in the third cholesteric liquid crystal part 133 is in a focal conic state, which can disperse the part of the first color light L1 near the positive viewing angle towards the large viewing angle direction. Compared with the comparative example, the angular distribution of the first color light L1 emitted from the first sub-pixel region AA is relatively wide, which can improve the matching of the angular distributions of the light rays emitted from the first sub-pixel region AA, the second sub-pixel region BB, and the third sub-pixel region CC, and can alleviate the problem of angular color shift.

Claims

1. A color conversion substrate, characterized in that, Comprising: A substrate; A color conversion layer located on one side of the substrate; The color conversion layer includes a first color conversion part; the first color conversion part is configured to convert first color light rays incident on the first color conversion part into second color light rays; A cholesteric liquid crystal layer; the cholesteric liquid crystal layer includes a first cholesteric liquid crystal part located between the substrate and the first color conversion part; the first cholesteric liquid crystal part is configured to reflect the light rays in the first color light rays that have not been converted back to the first color conversion part; A light-transmitting part arranged along a first direction with the color conversion layer, the first direction intersects with the thickness direction of the substrate, and the first color light rays pass through the light-transmitting part; Wherein, the cholesteric liquid crystal layer further includes a third cholesteric liquid crystal part located between the substrate and the light-transmitting part; the third cholesteric liquid crystal part is configured to disperse the part of the first color light rays near the positive viewing angle passing through the light-transmitting part towards the large viewing angle direction; the cholesteric liquid crystal in the third cholesteric liquid crystal part is in a focal conic state.

2. The color conversion substrate according to claim 1, wherein The color conversion layer further includes a second color conversion part arranged along the first direction with the first color conversion part, the first direction intersects with the thickness direction of the substrate, and the second color conversion part is configured to convert first color light rays incident on the second color conversion part into third color light rays; The cholesteric liquid crystal layer further includes a second cholesteric liquid crystal part located between the substrate and the second color conversion part; the second cholesteric liquid crystal part is configured to reflect the light rays in the first color light rays that have not been converted back to the second color conversion part.

3. The color conversion substrate according to claim 2, wherein, The cholesteric liquid crystal in the first cholesteric liquid crystal part and the second cholesteric liquid crystal part is in a planar state.

4. The color conversion substrate according to claim 2 or 3, wherein The first cholesteric liquid crystal part includes a first chiral liquid crystal part and a second chiral liquid crystal part stacked; the helical direction of the liquid crystal molecules in the first chiral liquid crystal part is opposite to the helical direction of the liquid crystal molecules in the second chiral liquid crystal part; The second cholesteric liquid crystal part includes a third chiral liquid crystal part and a fourth chiral liquid crystal part stacked; the helical direction of the liquid crystal molecules in the third chiral liquid crystal part is opposite to the helical direction of the liquid crystal molecules in the fourth chiral liquid crystal part.

5. The color conversion substrate according to claim 2 or 3, characterized in that, The pitch of the liquid crystal molecules in the first cholesteric liquid crystal part is greater than or equal to 270 nm and less than or equal to 310 nm; the pitch of the liquid crystal molecules in the second cholesteric liquid crystal part is greater than or equal to 270 nm and less than or equal to 310 nm.

6. The color conversion substrate according to claim 2 or 3, characterized in that, The first color light rays are blue light rays; the central reflection wavelength of the first cholesteric liquid crystal part is greater than or equal to 450 nm and less than or equal to 470 nm; the central reflection wavelength of the second cholesteric liquid crystal part is greater than or equal to 450 nm and less than or equal to 470 nm.

7. The color conversion substrate according to claim 2 or 3, wherein The full width at half maximum of the transmission spectrum of the first cholesteric liquid crystal part is greater than or equal to 70 nm and less than or equal to 100 nm; the full width at half maximum of the transmission spectrum of the second cholesteric liquid crystal part is greater than or equal to 70 nm and less than or equal to 100 nm.

8. The color conversion substrate according to claim 2, wherein It further includes an alignment layer located between the cholesteric liquid crystal layer and the substrate. The alignment layer includes a first alignment portion, a second alignment portion, and a third alignment portion arranged along a first direction; the first alignment portion is configured to align the liquid crystal molecules in the first cholesteric liquid crystal portion; the second alignment portion is configured to align the liquid crystal molecules in the second cholesteric liquid crystal portion; the third alignment portion is configured to align the liquid crystal molecules in the third cholesteric liquid crystal portion.

9. The color conversion substrate according to claim 1, wherein The haze of the third cholesteric liquid crystal portion is greater than or equal to 3% and less than or equal to 8%.

10. The color conversion substrate according to claim 1, wherein The transmittance of the third cholesteric liquid crystal portion to light in a first wavelength band is greater than or equal to 90%; the minimum wavelength of the first wavelength band is 450 nm, and the maximum wavelength of the first wavelength band is 470 nm.

11. The color conversion substrate according to any one of claims 1 to 3, characterized in that, The thickness of the cholesteric liquid crystal layer is greater than or equal to 2 µm and less than or equal to 6 µm.

12. The color conversion substrate according to claim 2 or 3, wherein The material of the first color conversion portion includes a first quantum dot material; the material of the second color conversion portion includes a second quantum dot material.

13. The color conversion substrate according to claim 2, wherein, It further includes a blocking pattern, which includes a plurality of first openings. The first color conversion portion and the first cholesteric liquid crystal portion are located within one of the first openings; the second color conversion portion and the second cholesteric liquid crystal portion are located within another of the first openings; the light-transmitting portion and the third cholesteric liquid crystal portion are located within yet another of the first openings.

14. The color conversion substrate according to claim 13, wherein It further includes a light-blocking layer located between the cholesteric liquid crystal layer and the substrate, and the light-blocking layer includes: An absorption pattern, which includes a plurality of second openings that are aligned with the plurality of first openings; A plurality of color film portions located on the side of the substrate close to the cholesteric liquid crystal layer; the color film portion is disposed within one of the second openings; the plurality of color film portions include a first color film portion opposite to the first color conversion portion, a second color film portion opposite to the second color conversion portion, and a third color film portion opposite to the light-transmitting portion.

15. A method for preparing a color conversion substrate, characterized in that, It includes: Providing a substrate; Forming a cholesteric liquid crystal layer on one side of the substrate; the cholesteric liquid crystal layer includes a first cholesteric liquid crystal portion; Forming a color conversion layer on the side of the cholesteric liquid crystal layer away from the substrate; the color conversion layer includes a first color conversion portion located on the side of the first cholesteric liquid crystal portion away from the substrate; Wherein, the first color conversion portion is configured to convert first color light incident on the first color conversion portion into second color light; the first cholesteric liquid crystal portion is configured to reflect the light in the first color light that has not been converted back to the first color conversion portion; The color conversion substrate further includes a light-transmitting portion arranged along a first direction with the color conversion layer. The first direction intersects with the thickness direction of the substrate, and the first color light passes through the light-transmitting portion; Wherein, the cholesteric liquid crystal layer further includes a third cholesteric liquid crystal portion located between the substrate and the light-transmitting portion; the third cholesteric liquid crystal portion is configured to disperse the part of the first color light passing through the light-transmitting portion that is close to the normal viewing angle towards the large viewing angle direction; the cholesteric liquid crystal in the third cholesteric liquid crystal portion is in a focal conic state.

16. The method for preparing the color conversion substrate according to claim 15, wherein: The color conversion layer further includes a second color conversion part arranged along a first direction with the first color conversion part, and the second color conversion part is configured to convert the first color light rays incident on the second color conversion part into third color light rays; Forming a cholesteric liquid crystal layer on one side of the substrate includes: Forming an initial cholesteric liquid crystal layer on one side of the substrate, and the initial cholesteric liquid crystal layer includes a first initial cholesteric liquid crystal part, a second initial cholesteric liquid crystal part, and a third initial cholesteric liquid crystal part; Forming the first initial cholesteric liquid crystal part into the first cholesteric liquid crystal part, and forming the second initial cholesteric liquid crystal part into the second cholesteric liquid crystal part; the second cholesteric liquid crystal part is located between the substrate and the second color conversion part; the second cholesteric liquid crystal part is configured to reflect the light rays in the first color light rays that have not been converted back to the second color conversion part; Forming the third initial cholesteric liquid crystal part into the third cholesteric liquid crystal part.

17. A display panel, characterized in that, Including the color conversion substrate according to any one of claims 1 to 14; Further including a light-emitting substrate, the light-emitting substrate being opposite to the color conversion substrate; the light-emitting substrate is configured to emit the first color light rays.

18. The display panel according to claim 17, wherein The light-emitting substrate includes an LED light-emitting substrate.

19. The display panel according to claim 18, wherein, The light-emitting substrate includes any one of an OLED light-emitting substrate, a Micro LED light-emitting substrate, and a Mini LED light-emitting substrate.

20. The display panel according to any one of claims 17 to 19, wherein, The light-emitting substrate is an OLED light-emitting substrate; The OLED light-emitting substrate includes a cathode and an anode arranged oppositely, and at least two light-emitting units arranged between the cathode and the anode; The light-emitting unit includes a light-emitting layer, and the light-emitting layer is configured to emit the first color light rays to the color conversion substrate.

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