Display panel and display device

Abstract

The present application discloses a display panel and a display device, which belong to the field of display technology. The display panel includes: a light-emitting substrate, and a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate. The particle size of the scattering particles in the first quantum dot layer is smaller than the particle size of the scattering particles in the second quantum dot layer, so that the scattering particles with smaller particle size in the first quantum dot layer can adapt to the light of the first color with a smaller wavelength, and the scattering particles with larger particle size in the second quantum dot layer can adapt to the light of other colors with a larger wavelength. In this way, it can be ensured that the light passing through the first quantum dot layer and the second quantum dot layer has a good scattering effect, so as to maximize the extension of the propagation path of the light in the first quantum dot layer and the second quantum dot layer, so that the light extraction efficiency of the display panel is higher, thereby effectively reducing the power consumption of the display panel.

Description

Technical Field

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

[0002] With the development of display technology, the demand and application scope of display devices are constantly expanding. Commonly used display devices include mobile phones, televisions, tablet computers, laptops and monitors.

[0003] Currently, quantum dot materials, as a new type of luminescent material, are increasingly being used in display panels in display devices. Display panels typically include a light-emitting substrate and a quantum dot conversion layer located on the light-emitting side of the substrate. The quantum dot conversion layer is formed by solution processing, spin coating, or inkjet printing of quantum dot materials, followed by curing to form a film. The quantum dot conversion layer contains multiple red and green quantum dots. The red quantum dots can convert blue light emitted by the light-emitting substrate into red light, while the green quantum dots can convert blue light emitted by the light-emitting substrate into green light.

[0004] However, the current display panels integrated with quantum dot conversion layers have low light extraction efficiency, resulting in high power consumption of the display panels. Summary of the Invention

[0005] The present invention provides a display panel and a display device. This embodiment can solve the problem of low light extraction efficiency of display panels integrated with quantum dot conversion layers in the prior art. The technical solution is as follows:

[0006] In one aspect, a display panel is provided, comprising:

[0007] a light-emitting substrate configured to emit light of a first color;

[0008] a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate, wherein the first quantum dot layer and the second quantum dot layer are both filled with: quantum dots for converting light of the first color into light of other colors, and scattering particles for scattering light;

[0009] The wavelength of the light of the first color is smaller than the wavelength of the light of the other colors, and the maximum particle size of the scattering particles in the first quantum dot layer is smaller than the minimum particle size of the scattering particles in the second quantum dot layer.

[0010] Optionally, at least one of the first quantum dot layer and the second quantum dot layer is filled with scattering particles of multiple different particle sizes.

[0011] Optionally, at least one of the first quantum dot layer and the second quantum dot layer includes: a plurality of sub-quantum dot layers stacked along the light emitting direction of the light emitting substrate, and the particle size of the scattering particles in each of the sub-quantum dot layers is different.

[0012] Optionally, the particle size of the scattering particles in each of the sub-quantum dot layers gradually increases along the light emitting direction of the light emitting substrate.

[0013] Optionally, the display panel has: a second sub-pixel region for converting the light of the first color into the light of a second color, and a third sub-pixel region for converting the light of the first color into the light of a third color;

[0014] The first quantum dot layer and the second quantum dot layer are distributed in both the second sub-pixel region and the third sub-pixel region;

[0015] The wavelength of the second color light is smaller than the wavelength of the third color light, and the maximum particle size of the scattering particles in the second quantum dot layer distributed in the second sub-pixel area is smaller than the minimum particle size of the scattering particles in the second quantum dot layer distributed in the third sub-pixel area.

[0016] Optionally, the particle size of the scattering particles in the first quantum dot layer distributed in the second sub-pixel region is the same as the particle size of the scattering particles in the first quantum dot layer distributed in the third sub-pixel region.

[0017] Optionally, the light-emitting substrate is further configured to emit light of a second color;

[0018] The second sub-pixel region and the third sub-pixel region are further distributed with: a third quantum dot layer located between the first quantum dot layer and the second quantum dot layer, the third quantum dot layer being filled with quantum dots and scattering particles;

[0019] The maximum particle size of the scattering particles in the third quantum dot layer distributed in the second sub-pixel region is smaller than the minimum particle size of the scattering particles in the third quantum dot layer distributed in the third sub-pixel region.

[0020] Optionally, in the third sub-pixel area, the maximum particle size of the scattering particles in the third quantum dot layer is smaller than the minimum particle size of the scattering particles in the second quantum dot layer, and the minimum particle size of the scattering particles in the third quantum dot layer is larger than the maximum particle size of the scattering particles in the first quantum dot layer.

[0021] Optionally, the display panel further has: a first sub-pixel area for transmitting the first color light, and the display panel further includes: a scattering layer distributed in the first sub-pixel area and filled with scattering particles, the particle size of the scattering particles in the scattering layer is the same as the particle size of the scattering particles in the first quantum dot layer.

[0022] On the other hand, a display device is provided, including: a power supply component, and a display panel electrically connected to the power supply component, wherein the display panel is any of the display panels described above.

[0023] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0024] The display panel provided by the embodiment of the present application includes: a light-emitting substrate, and a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate. Since the proportion of light of the first color in the light transmitted in the first quantum dot layer is greater than the proportion of light of other colors, the proportion of light of other colors in the light transmitted in the second quantum dot layer is greater than the proportion of light of the first color, and the wavelength of light of the first color is smaller than the wavelength of light of other colors. Therefore, the particle size of the scattering particles in the first quantum dot layer can be made smaller than the particle size of the scattering particles in the second quantum dot layer, so that the scattering particles with smaller particle size in the first quantum dot layer can adapt to the light of the first color with smaller wavelength, and the scattering particles with larger particle size in the second quantum dot layer can adapt to the light of other colors with larger wavelength, so as to ensure that the scattering particles in the first quantum dot layer have a better scattering effect on the light of the first color, and the scattering particles in the second quantum dot layer have a better scattering effect on the light of other colors. In this way, it can be ensured that the light passing through the first quantum dot layer and the second quantum dot layer has a good scattering effect, so as to maximize the propagation path of the light in the first quantum dot layer and the second quantum dot layer, so that the light extraction efficiency of the display panel is higher, thereby effectively reducing the power consumption of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is a schematic diagram of the film structure of a common display panel.

[0027] Figure 2 Schematic diagram of a film structure of a display panel provided in an embodiment of the present application;

[0028] Figure 3 Schematic diagram of an energy transition mode of a quantum dot provided in an embodiment of the present application;

[0029] Figure 4 Schematic diagram of the relationship between the scattering efficiency of a scattering particle for light and the scale number provided in an embodiment of the present application;

[0030] Figure 5 This is a schematic diagram of the film structure of a first quantum dot layer provided in an embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of the film structure of another first quantum dot layer provided in an embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of a film structure of a stacked first quantum dot layer and a second quantum dot layer provided in an embodiment of the present application;

[0033] Figure 8 Schematic diagram of the film structure of another display panel provided in an embodiment of the present application;

[0034] Figure 9 This is a schematic diagram of the film layer structure of another display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0036] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the film structure of a common display panel. Display panel 00 may include a light-emitting substrate 01 and a quantum dot conversion layer 02 located on the light-emitting side of light-emitting substrate 01. Here, quantum dot conversion layer 02 is filled with quantum dots 021 and scattering particles 022.

[0037] The quantum dots 021 in the quantum dot conversion layer 02 are used to convert the blue light emitted by the light-emitting substrate 01 into light of other colors. The scattering particles 022 in the quantum dot conversion layer 02 are used to scatter the light passing through the quantum dot conversion layer 02.

[0038] Here, the scattering efficiency of scattering particles 022 is related to the scale factor α, and the scattering efficiency of scattering particles 022 oscillates with increasing scale factor α. The formula for calculating scale factor α is: α = 2πr / λ. Here, r is half the diameter of scattering particle 022, and λ is the wavelength of light received by scattering particle 022. Furthermore, the higher the scattering efficiency of scattering particles 022, the higher the intensity of light scattered by scattering particles 022, resulting in a better scattering effect after light is scattered by scattering particles 022.

[0039] However, the particle size of each scattering particle 022 in the current quantum dot conversion layer 02 is the same, resulting in scattering particles 022 of this particle size only being able to ensure a good scattering effect for light of one wavelength, while the wavelength range of light passing through the quantum dot conversion layer 02 is relatively wide. For example, the light passing through the quantum dot conversion layer 02 may contain blue light, red light, or green light. For this reason, this quantum dot conversion layer 02 has a poor scattering effect on light of other wavelengths, resulting in a shorter propagation path for light of other wavelengths within the quantum dot conversion layer 02, which in turn results in a lower light extraction efficiency of the display panel 00 integrated with this quantum dot conversion layer 02. In this way, it is necessary to increase power consumption to ensure the brightness of the display panel 00, resulting in higher power consumption of this display panel 00.

[0040] Please refer to Figure 2 , Figure 2 Schematic diagram of the film structure of a display panel provided in an embodiment of the present application. Display panel 000 may include: a light-emitting substrate 100, and a first quantum dot layer 200 and a second quantum dot layer 300 located on the light-emitting side of the light-emitting substrate 100 and stacked along the light-emitting direction X of the light-emitting substrate 100.

[0041] It should be noted that in Figure 2 In the embodiment, the first quantum dot layer 200 and the second quantum dot layer 300 can be stacked on the substrate 400, and then the substrate 400 with the first quantum dot layer 200 and the second quantum dot layer 300 can be aligned with the light-emitting substrate 100 to obtain the display panel 000. In other possible implementations, the first quantum dot layer 200 and the second quantum dot layer 300 can also be directly formed on the light-emitting side of the light-emitting substrate 100. This embodiment of the present application is not limited to this.

[0042] The light emitting substrate 100 in the display panel 000 is used to emit light of a first color.

[0043] The first quantum dot layer 200 and the second quantum dot layer 300 in the display panel 000 are both filled with quantum dots for converting light of a first color into light of other colors, and scattering particles for scattering light. Here, the number of quantum dots 201 and the number of scattering particles 202 filled in the first quantum dot layer 200 are both multiple, and the multiple quantum dots 201 are evenly distributed in the first quantum dot layer 200, and the multiple scattering particles 202 are also evenly distributed in the first quantum dot layer 200. Similarly, the number of quantum dots 301 and the number of scattering particles 302 filled in the second quantum dot layer 300 are both multiple, and the multiple quantum dots 301 are evenly distributed in the second quantum dot layer 300, and the multiple scattering particles 302 are also evenly distributed in the second quantum dot layer 300.

[0044] For example, after receiving light, the scattering particles in the first quantum dot layer 200 and the second quantum dot layer 300 may perform Mie scattering on the light.

[0045] like Figure 3 As shown, Figure 3 This is a schematic diagram of an energy transition mode of a quantum dot provided in an embodiment of the present application. Since the size of the quantum dots in the first quantum dot layer 200 and the second quantum dot layer 300 is close to the Bohr radius, the quantum dots have a quantum effect. In this way, after the light of the first color emitted by the light-emitting substrate 100 is absorbed by the quantum dots in the first quantum dot layer 200 and the second quantum dot layer 300, the electrons transition to the conduction band, and then part of it radiates and transitions to the valence band in the form of light, and part of it transitions non-radiatively in the form of heat through surface traps. In addition, after the quantum dots absorb the light of the first color, the wavelength of the light that radiates and transitions to the valence band is different from the wavelength of the light of the first color. Therefore, the light of the first color can be converted into light of other colors through the quantum dots.

[0046] The wavelength of the first color light emitted by the light-emitting substrate 100 is shorter than the wavelength of light of other colors converted by the quantum dots in the first quantum dot layer 200 or the second quantum dot layer 300. Furthermore, the maximum particle size of the scattering particles 202 in the first quantum dot layer 200 is smaller than the minimum particle size of the scattering particles 302 in the second quantum dot layer 300.

[0047] In the embodiment of the present application, the scattering efficiency of the scattering particles in the first quantum dot layer 200 and the second quantum dot layer 300 is related to the scale factor α. The scale factor α is calculated as follows: α = 2πr / λ. Where r is half the particle size of the scattering particle, and λ is the wavelength of the light received by the scattering particle. For example, Figure 4 As shown, Figure 4 This is the relationship between the scattering efficiency of a scattering particle to light and the scale number provided in the embodiment of the present application. Figure 4In the figure, the horizontal axis represents the scale factor α, and the vertical axis represents the scattering efficiency of the scattering particles. Therefore, the scattering efficiency of the scattering particles oscillates with increasing scale factor α. The scattering efficiency is highest when the scale factor α is between 0.13 and 0.17; when the scale factor α is around 0.4, the scattering efficiency of the scattering particles is also relatively high.

[0048] Because the higher the scattering efficiency of the scattering particles, the higher the intensity of light scattered by the scattering particles, the better the scattering effect of the light after being scattered by the scattering particles. In addition, the wavelength of the light passing through the first quantum dot layer 200 and the second quantum dot layer 300 is relatively broad. For example, the light passing through the first quantum dot layer 200 and the second quantum dot layer 300 includes both light of the first color and light of other colors converted by the quantum dots. Therefore, in order to ensure that the light passing through the first quantum dot layer 200 and the second quantum dot layer 300 has a good scattering effect, it is necessary to ensure that the particle size of the scattering particles 202 in the first quantum dot layer 200 is different from the particle size of the scattering particles 302 in the second quantum dot layer 300.

[0049] Furthermore, after passing through the first quantum dot layer 200, only a small portion of the first color light emitted from the light-emitting substrate 100 is converted into light of other colors by the quantum dots. However, after passing through the second quantum dot layer 300, the majority of the first color light emitted from the light-emitting substrate 100 is converted into light of other colors by the quantum dots. Therefore, the proportion of light of the first color transmitted through the first quantum dot layer 200 is greater than that of light of other colors; and the proportion of light of other colors transmitted through the second quantum dot layer 300 is greater than that of light of the first color.

[0050] The wavelength of the first color light is shorter than the wavelengths of the other colors light. Therefore, to ensure that the light transmitted within the first quantum dot layer 200 is effectively scattered by the scattering particles 202, the particle size of the scattering particles 202 within the first quantum dot layer 200 must be relatively small. This allows the scattering particles 202 to adapt to the smaller wavelength of the first color light. For example, when the scale factor α is calculated to be in the range of 0.13 to 0.17 or approximately 0.4 based on the particle size of the scattering particles 202 and the wavelength of the first color light, the scattering particles 202 can effectively scatter the first color light.

[0051] Similarly, to ensure that light transmitted within the second quantum dot layer 300 is effectively scattered by the scattering particles 302, the scattering particles 302 within the second quantum dot layer 300 must be of a relatively large size. This allows the scattering particles 302 to scatter light of other colors with larger wavelengths. For example, when the scale factor α is calculated to be in the range of 0.13 to 0.17 or approximately 0.4 based on the particle size of the scattering particles 302 and the wavelength of light of other colors, the scattering particles 202 can effectively scatter light of other colors.

[0052] In this way, it can be ensured that the light passing through the first quantum dot layer 200 and the second quantum dot layer 300 has a good scattering effect, so as to maximize the extension of the propagation path of the light in the first quantum dot layer 200 and the second quantum dot layer 300, so that the light extraction efficiency of the display panel 000 is higher, thereby effectively reducing the power consumption of the display panel 000.

[0053] In summary, the display panel provided by the embodiment of the present application includes: a light-emitting substrate, and a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate. Since the proportion of light of the first color in the light transmitted in the first quantum dot layer is greater than the proportion of light of other colors, the proportion of light of other colors in the light transmitted in the second quantum dot layer is greater than the proportion of light of the first color, and the wavelength of light of the first color is smaller than the wavelength of light of other colors. Therefore, the particle size of the scattering particles in the first quantum dot layer can be made smaller than the particle size of the scattering particles in the second quantum dot layer, so that the scattering particles with smaller particle size in the first quantum dot layer can adapt to the light of the first color with smaller wavelength, and the scattering particles with larger particle size in the second quantum dot layer can adapt to the light of other colors with larger wavelength, so as to ensure that the scattering particles in the first quantum dot layer have a better scattering effect on the light of the first color, and the scattering particles in the second quantum dot layer have a better scattering effect on the light of other colors. In this way, it can be ensured that the light passing through the first quantum dot layer and the second quantum dot layer has a good scattering effect, so as to maximize the propagation path of the light in the first quantum dot layer and the second quantum dot layer, so that the light extraction efficiency of the display panel is higher, thereby effectively reducing the power consumption of the display panel.

[0054] In the embodiment of the present application, since the light of the first color and the light of the other colors correspond to light within a wavelength range. For example, the light of the first color here can be blue light, which corresponds to a wavelength band between 430 nanometers and 500 nanometers; when the light of the other color is green light, it corresponds to a wavelength band between 492 nanometers and 577 nanometers; when the light of the other color is red light, it corresponds to a wavelength band between 622 nanometers and 760 nanometers. Therefore, in order to further improve the scattering effect of light passing through the first quantum dot layer 200 and / or the second quantum dot layer 300, a plurality of scattering particles 202 of different particle sizes can be set in the first quantum dot layer 200, and / or, a plurality of scattering particles 302 of different particle sizes can be set in the second quantum dot layer 300. Among them, there are many ways to set a plurality of scattering particles of different particle sizes in the quantum dot layer (the first quantum dot layer 200 or the second quantum dot layer 300). The embodiment of the present application will be described by taking the following two optional implementation methods as examples:

[0055] In a first optional implementation, at least one of the first quantum dot layer 200 and the second quantum dot layer 300 is filled with scattering particles of various sizes. Figure 5 , Figure 5 This is a schematic diagram of the film structure of a first quantum dot layer provided in an embodiment of the present application. The first quantum dot layer 200 can be simultaneously filled with scattering particles 202 of various sizes, and the largest particle size of these scattering particles 202 must be smaller than the smallest particle size of the scattering particles 302 in the second quantum layer 300.

[0056] In the present application, the scattering particles 202 of various sizes filled in the first quantum dot layer 200 are all adapted to the first color of light, and each scattering particle 202 of various sizes in the first quantum dot layer 200 is adapted to a wavelength of light within the wavelength band corresponding to the first color of light. The various wavelengths of light adapted by the scattering particles 202 of various sizes in the first quantum dot layer 200 all fall within the half-wavelength peak range of the first color of light.

[0057] For example, when the wavelength range corresponding to the first color light is 430 nanometers to 500 nanometers, and the half-wave peak width of the first color light is 20 nanometers, if the first quantum dot layer 200 is required to have a good scattering effect on light with a wavelength of 460 nanometers and light with a wavelength of 470 nanometers, it is necessary to fill the first quantum dot layer 200 with scattering particles 202a and scattering particles 202b of different particle sizes, and the particle size of scattering particles 202a is smaller than the particle size of scattering particles 202b. In this way, the scattering particles 202a can adapt to the light with a wavelength of 460 nanometers, so that the light with a wavelength of 460 nanometers is better scattered when passing through the first quantum dot layer 200; the scattering particles 202b can adapt to the light with a wavelength of 470 nanometers, so that the light with a wavelength of 470 nanometers is better scattered when passing through the first quantum dot layer 200.

[0058] In a second optional implementation, at least one of the first quantum dot layer 200 and the second quantum dot layer 300 comprises: a plurality of sub-quantum dot layers stacked along the light emitting direction X of the light emitting substrate 100, and the particle size of the scattering particles in each sub-quantum dot layer is different. Taking the first quantum dot layer 200 as an example, please refer to Figure 6 , Figure 6 FIG2 is a schematic diagram of another film structure of a first quantum dot layer provided in an embodiment of the present application. The first quantum dot layer 200 may include: a plurality of sub-quantum dot layers 200a stacked along the light emitting direction X of the light-emitting substrate 100, wherein the scattering particles 202 in each sub-quantum dot layer 200a have different particle sizes, and the maximum particle size of these scattering particles 202 needs to be smaller than the minimum particle size of the scattering particles 302 in the second quantum layer 300.

[0059] In the present application, the particle size of the scattering particles 202 filled in each sub-quantum dot layer 200a in the first quantum dot layer 200 can be the same, but the particle size of the scattering particles 202 filled in different sub-quantum dot layers 200a is different. It should be noted that the principle of filling multiple sub-quantum dot layers 200a with scattering particles 202 of different particle sizes is the same as the principle of filling the first quantum dot layer 200 with scattering particles 202 of different particle sizes in the first optional implementation described above. This will not be further described here.

[0060] Optionally, the particle size of the scattering particles in each sub-quantum dot layer can be gradually increased along the light emitting direction X of the light emitting substrate 100. For example, when the first quantum dot layer 200 and the second quantum dot layer 300 both include multiple stacked sub-quantum dot layers, such as Figure 7 As shown, Figure 7: This is a schematic diagram of the film structure of a stacked first quantum dot layer and a second quantum dot layer provided in an embodiment of the present application. The particle size of the scattering particles 202 in each sub-quantum layer 200a in the first quantum dot layer 200 gradually increases along the light emitting direction X of the light emitting substrate 100. The particle size of the scattering particles 302 in each sub-quantum layer 300a in the second quantum dot layer 300 gradually increases along the light emitting direction X of the light emitting substrate 100. In this way, the particle size of the scattering particles in each sub-quantum dot layer of the display panel 000 gradually increases along the light emitting direction X of the light emitting substrate 100. In this way, in the process of preparing the display panel 000, the scattering particles of corresponding particle sizes can be mixed in the corresponding sub-quantum film layers in the order of the particle size of each scattering particle from large to small, with the substrate 400 approaching the light emitting substrate 100, thereby effectively reducing the difficulty of preparing the quantum dot film layer in the display panel 100.

[0061] In the embodiments of this application, Figure 8 As shown, Figure 8 Schematic diagram of the film structure of another display panel provided in an embodiment of the present application. Display panel 000 has: a second sub-pixel region 002 for converting light of a first color into light of a second color, and a third sub-pixel region 003 for converting light of the first color into light of a third color.

[0062] In the present application, a first quantum dot layer 200 and a second quantum dot layer 300 are distributed in both the second sub-pixel region 002 and the third sub-pixel region 003. It should be noted that the quantum dots 201 in the first quantum dot layer 200 in the second sub-pixel region 002 can be the same as the quantum dots 301 in the second quantum dot layer 300, and these quantum dots are both used to convert light of the first color into light of the second color; the quantum dots 201 in the first quantum dot layer 200 in the third sub-pixel region 003 can be the same as the quantum dots 301 in the second quantum dot layer 300, and these quantum dots are both used to convert light of the first color into light of the third color. For this reason, the quantum dots distributed in the second sub-pixel region 002 are different from the quantum dots distributed in the third sub-pixel region 003. Here, the first color of light can be blue light, the second color of light can be green light, and the third color of light can be red light. In this case, the quantum dots distributed in the second sub-pixel region 002 may be green quantum dots for converting blue light into green light, and the quantum dots distributed in the third sub-pixel region 003 may be red quantum dots for converting blue light into red light.

[0063] The wavelength of the second color light is shorter than the wavelength of the third color light, and the maximum particle size of the scattering particles 302 in the second quantum dot layer 300 distributed in the second sub-pixel region 002 is smaller than the minimum particle size of the scattering particles 302 in the second quantum dot layer 300 distributed in the third sub-pixel region 003. Therefore, the scattering particles 302 in the second quantum dot layer 300 located in the second sub-pixel region 002 are smaller in size and can adapt to the second color light with a smaller wavelength, thereby achieving a better scattering effect of the second color light when passing through the second quantum dot layer 300. The scattering particles 302 located in the third sub-pixel region 003 are larger in size and can adapt to the third color light with a larger wavelength, thereby achieving a better scattering effect of the third color light when passing through the second quantum dot layer 300.

[0064] Optionally, since the particle size of the scattering particles 202 in the first quantum dot layer 200 distributed in the second sub-pixel region 002 is primarily adapted to the light of the first color, the particle size of the scattering particles 202 in the first quantum dot layer 200 distributed in the third sub-pixel region 003 is also primarily adapted to the light of the first color. Therefore, the particle size of the scattering particles 202 in the first quantum dot layer 200 distributed in the second sub-pixel region 002 can be the same as the particle size of the scattering particles 202 in the first quantum dot layer 200 distributed in the third sub-pixel region 003.

[0065] For example, Figure 8 As shown, when the first quantum dot layer 200 includes two stacked sub-quantum dot layers 200a and the second quantum dot layer 300 is a single layer, if the scale number α needs to be controlled to be within a range of 0.13 to 0.17, then the particle size range of the scattering particles filled in the sub-quantum dot layer 200a close to the light-emitting substrate 100 in the first quantum dot layer 200 in the second sub-pixel region 002 and the third sub-pixel region 003 can both be: 15 nanometers to 20 nanometers; the particle size range of the scattering particles filled in the sub-quantum dot layer 200a away from the light-emitting substrate 100 in the first quantum dot layer 200 in the second sub-pixel region 002 and the third sub-pixel region 003 can both be: 20 nanometers to 25 nanometers; the particle size range of the scattering particles filled in the second quantum dot layer 300 in the second sub-pixel region 002 can be: 25 nanometers to 30 nanometers; the particle size range of the scattering particles filled in the second quantum dot layer 300 in the third sub-pixel region 003 can be: 30 nanometers to 35 nanometers.

[0066] It should be noted that the above embodiments are schematically described by taking the light emitting substrate 100 emitting only the first color of light as an example. In other possible implementations, the light emitting substrate 100 can emit not only the first color of light but also the second color of light.

[0067] In this case, if Figure 9 As shown, Figure 9 This is a schematic diagram of the film structure of another display panel provided by an embodiment of the present application. Both the second sub-pixel region 002 and the third sub-pixel region 003 are further distributed with a third quantum dot layer 500 located between the first quantum dot layer 200 and the second quantum dot layer 300. The third quantum dot layer 500 is filled with quantum dots 501 and scattering particles 502.

[0068] Here, in the second sub-pixel area 002, the quantum dots 501 in the third quantum dot layer 500 are the same as the quantum dots 201 in the first quantum dot layer 200, and the same as the quantum dots 301 in the second quantum dot layer 300, and these quantum dots are all used to convert light of the first color into light of the second color; in the third sub-pixel area 003, the quantum dots 501 in the third quantum dot layer 500 are the same as the quantum dots 201 in the first quantum dot layer 200, and the same as the quantum dots 301 in the second quantum dot layer 300, and these quantum dots are all used to convert light of the first color into light of the third color, or, to convert light of the second color into light of the third color.

[0069] In the present application, within the second sub-pixel region 002, the scattering particles in the third quantum dot layer 500 and the first quantum dot layer 200 can both adapt to the first color of light, while the scattering particles in the second quantum dot layer 300 are used to adapt to the second color of light. Within the third sub-pixel region 003, the scattering particles in the first quantum dot layer 200 can adapt to the first color of light, the scattering particles in the third quantum dot layer 500 can adapt to the second color of light, and the scattering particles in the second quantum dot layer 300 can adapt to the third color of light.

[0070] To this end, the maximum particle size of the scattering particles 502 in the third quantum dot layer 500 distributed in the second sub-pixel region 002 is smaller than the minimum particle size of the scattering particles 502 in the third quantum dot layer 500 distributed in the third sub-pixel region 003. Furthermore, in the third sub-pixel region 003, the maximum particle size of the scattering particles 502 in the third quantum dot layer 500 is smaller than the minimum particle size of the scattering particles 302 in the second quantum dot layer 300, and the minimum particle size of the scattering particles 502 in the third quantum dot layer 500 is larger than the maximum particle size of the scattering particles 202 in the first quantum dot layer 200. In other words, in the third sub-pixel region 003, the particle size of the scattering particles in the three quantum dot layers gradually increases along the light emitting direction of the light-emitting substrate 100.

[0071] In the second sub-pixel region 002, the particle size of the scattering particles 502 in the third quantum dot layer 500 can be the same as the particle size of the scattering particles 202 in the first quantum dot layer 200. In other possible implementations, the minimum particle size of the scattering particles 502 in the third quantum dot layer 500 can also be greater than the maximum particle size of the scattering particles 202 in the first quantum dot layer 200. In this way, the first quantum dot layer 200 and the third quantum dot layer 300 in the second sub-pixel region 002 are equivalent to the two stacked sub-quantum dot layers 200a distributed in the first quantum dot layer 200 in the aforementioned embodiment. The arrangement principle will not be described in detail here. Moreover, in this case, in the second sub-pixel region 002, along the light emitting direction of the light-emitting substrate 100, the particle size of the scattering particles in the three quantum dot layers gradually increases.

[0072] For example, Figure 9 As shown, if the scale factor α needs to be controlled within the range of 0.13 to 0.17, then, within the second sub-pixel region 002, the particle size of the scattering particles 202 in the first quantum dot layer 200 can be in the range of 15 to 20 nanometers; the particle size of the scattering particles 502 in the third quantum dot layer 500 can be in the range of 20 to 25 nanometers; and the particle size of the scattering particles 302 in the second quantum dot layer 300 can be in the range of 25 to 30 nanometers. Within the third sub-pixel region 003, the particle size of the scattering particles 202 in the first quantum dot layer 200 can be in the range of 15 to 20 nanometers; the particle size of the scattering particles 502 in the third quantum dot layer 500 can be in the range of 25 to 30 nanometers; and the particle size of the scattering particles 302 in the second quantum dot layer 300 can be in the range of 30 to 35 nanometers.

[0073] Optional, such as Figure 8 and Figure 9 As shown, the display panel 000 further comprises a first sub-pixel region 001 for transmitting light of a first color. The display panel 000 also comprises a scattering layer 600 distributed within the first sub-pixel region 001 and filled with scattering particles 601. It should be noted that in the embodiment of the present application, the first quantum dot layer 200 and the second quantum dot layer 300 are located both within the second sub-pixel region 002 and within the third sub-pixel region 003, while the first sub-pixel region 001 is not provided with a quantum dot layer, but only with the scattering layer 600.

[0074] Here, the scattering particles 601 in the scattering layer 600 are used to adapt to the light of the first color, so that the light of the first color is scattered better when passing through the scattering layer 600. To this end, the scattering particles 601 in the scattering layer 600 can have the same particle size as the scattering particles 202 in the first quantum dot layer 200.

[0075] In the embodiments of this application, Figure 8 and Figure 9 As shown, the display panel 000 may further include a black matrix 700 located between two adjacent sub-pixel regions. The black matrix 700 can reduce the probability of cross-color phenomenon occurring in the display panel.

[0076] Optional, such as Figure 8 and Figure 9 As shown, the display panel 000 may further include a color resist layer. For example, the color resist layer may include a first color resist block 801 located in the first sub-pixel region 001 , a second color resist block 802 located in the second sub-pixel region 002 , and a third color resist block 803 located in the third sub-pixel region 003 . Among them, in the first sub-pixel area 001, the first color block 801 is arranged on the side of the scattering layer 600 away from the light-emitting substrate 100, and the first color block 801 is used to filter light except the light of the first color, so that only light of the first color in the display panel 000 can be emitted from the first sub-pixel area 001; in the second sub-pixel area 002, the second color block 802 is arranged on the side of the second quantum dot layer 300 away from the light-emitting substrate 100, and the second color block 802 is used to filter light except the light of the second color, so that only light of the second color in the display panel 000 can be emitted from the second sub-pixel area 002; in the third sub-pixel area 003, the third color block 803 is arranged on the side of the second quantum dot layer 300 away from the light-emitting substrate 100, and the third color block 803 is used to filter light except the light of the third color, so that only light of the third color in the display panel 000 can be emitted from the third sub-pixel area 003.

[0077] In this application, the light-emitting substrate 100 in the display panel 000 may include an organic light-emitting diode (OLED) substrate, or a liquid crystal display with a backlight. Here, the OLED substrate may directly emit light of a first color, or a mixed light composed of light of the first color and light of a second color; the backlight may also directly emit light of the first color, or a mixed light composed of light of the first color and light of a second color.

[0078] Optionally, the scattering particles in the above embodiment may be particles made of titanium dioxide or silicon dioxide.

[0079] In summary, the display panel provided by the embodiment of the present application includes: a light-emitting substrate, and a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate. Since the proportion of light of the first color in the light transmitted in the first quantum dot layer is greater than the proportion of light of other colors, the proportion of light of other colors in the light transmitted in the second quantum dot layer is greater than the proportion of light of the first color, and the wavelength of light of the first color is smaller than the wavelength of light of other colors. Therefore, the particle size of the scattering particles in the first quantum dot layer can be made smaller than the particle size of the scattering particles in the second quantum dot layer, so that the scattering particles with smaller particle size in the first quantum dot layer can adapt to the light of the first color with smaller wavelength, and the scattering particles with larger particle size in the second quantum dot layer can adapt to the light of other colors with larger wavelength, so as to ensure that the scattering particles in the first quantum dot layer have a better scattering effect on the light of the first color, and the scattering particles in the second quantum dot layer have a better scattering effect on the light of other colors. In this way, it can be ensured that the light passing through the first quantum dot layer and the second quantum dot layer has a good scattering effect, so as to maximize the propagation path of the light in the first quantum dot layer and the second quantum dot layer, so that the light extraction efficiency of the display panel is higher, thereby effectively reducing the power consumption of the display panel.

[0080] The present application also provides a display device, which can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc. The display device may include: a power supply component, and a display panel electrically connected to the power supply component. The display panel may be the display panel in the above embodiment. For example, the display panel may be Figure 2 、 Figure 8 or Figure 9 The display panel is shown.

[0081] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0082] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0083] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: a light-emitting substrate configured to emit light of a first color; a first quantum dot layer and a second quantum dot layer located on the light-emitting side of the light-emitting substrate and stacked along the light-emitting direction of the light-emitting substrate, wherein the first quantum dot layer and the second quantum dot layer are both filled with: quantum dots for converting light of the first color into light of other colors, and scattering particles for scattering light; The wavelength of the light of the first color is smaller than the wavelength of the light of the other colors, and the maximum particle size of the scattering particles in the first quantum dot layer is smaller than the minimum particle size of the scattering particles in the second quantum dot layer; In the light transmitted in the first quantum dot layer, the proportion of the first color light is greater than the proportion of the other colors, and in the light transmitted in the second quantum dot layer, the proportion of the other colors light is greater than the proportion of the first color light; the particle size of the scattering particles in the first quantum dot layer is adapted to the wavelength of the first color light, and is used to scatter the first color light; the particle size of the scattering particles in the second quantum dot layer is adapted to the wavelength of the other colors light, and is used to scatter the other colors light.

2. The display panel according to claim 1, wherein: At least one of the first quantum dot layer and the second quantum dot layer is filled with scattering particles of various sizes.

3. The display panel according to claim 1, wherein: At least one of the first quantum dot layer and the second quantum dot layer includes: a plurality of sub-quantum dot layers stacked along the light emitting direction of the light emitting substrate, and the particle size of scattering particles in each of the sub-quantum dot layers is different.

4. The display panel according to claim 3, wherein: The particle size of the scattering particles in each of the sub-quantum dot layers gradually increases along the light emitting direction of the light emitting substrate.

5. The display panel according to any one of claims 1 to 4, characterized in that: The display panel has: a second sub-pixel region for converting the light of the first color into the light of the second color, and a third sub-pixel region for converting the light of the first color into the light of the third color; The first quantum dot layer and the second quantum dot layer are distributed in both the second sub-pixel region and the third sub-pixel region; The wavelength of the second color light is smaller than the wavelength of the third color light, and the maximum particle size of the scattering particles in the second quantum dot layer distributed in the second sub-pixel area is smaller than the minimum particle size of the scattering particles in the second quantum dot layer distributed in the third sub-pixel area.

6. The display panel according to claim 5, wherein: The particle size of the scattering particles in the first quantum dot layer distributed in the second sub-pixel region is the same as the particle size of the scattering particles in the first quantum dot layer distributed in the third sub-pixel region.

7. The display panel according to claim 5, wherein: The light-emitting substrate is further configured to emit light of a second color; The second sub-pixel region and the third sub-pixel region are further distributed with: a third quantum dot layer located between the first quantum dot layer and the second quantum dot layer, the third quantum dot layer being filled with quantum dots and scattering particles; The maximum particle size of the scattering particles in the third quantum dot layer distributed in the second sub-pixel region is smaller than the minimum particle size of the scattering particles in the third quantum dot layer distributed in the third sub-pixel region.

8. The display panel according to claim 7, wherein: In the third sub-pixel area, the maximum particle size of the scattering particles in the third quantum dot layer is smaller than the minimum particle size of the scattering particles in the second quantum dot layer, and the minimum particle size of the scattering particles in the third quantum dot layer is larger than the maximum particle size of the scattering particles in the first quantum dot layer.

9. The display panel according to any one of claims 6 to 8, characterized in that: The display panel further comprises: a first sub-pixel region for transmitting the first color light; and a scattering layer distributed in the first sub-pixel region and filled with scattering particles, wherein the particle size of the scattering particles in the scattering layer is the same as the particle size of the scattering particles in the first quantum dot layer.

10. A display device, characterized in that: include: A power supply component, and a display panel electrically connected to the power supply component, wherein the display panel is the display panel according to any one of claims 1 to 9.

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