Display panel and display device

Abstract

The present invention discloses a display panel and a display device. The display panel includes: a substrate and a light-emitting device layer located on the substrate; the substrate includes a substrate and a photonic crystal layer, the photonic crystal layer and the substrate are integrally formed or the photonic crystal layer is located between the substrate and the light-emitting device layer; the photonic crystal layer is used to reflect the light in the display panel that matches the photonic bandgap of the photonic crystal layer to the picture display side of the display panel; wherein the light in the display panel that matches the photonic bandgap of the photonic crystal layer includes light scattered from the light-emitting device layer to the substrate. The technical solution of the embodiment of the present invention solves the technical problem of high power consumption of the display panel, improves the light output intensity on the picture display side of the display panel, and reduces the power consumption of the display panel.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) display panels have been listed as the next generation display technology with great development prospects because of their advantages such as thinness, lightness, wide viewing angle, active luminescence, continuously adjustable luminous color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high luminous efficiency and flexible display.

[0003] However, current OLED display panels generally have the problem of high power consumption. Summary of the invention

[0004] The present invention provides a display panel and a display device to solve the technical problem of high power consumption of the display panel, improve the light output intensity of the picture display side of the display panel, and reduce the power consumption of the display panel.

[0005] According to one aspect of the present invention, there is provided a display panel, the display panel comprising: a substrate and a light emitting device layer located on the substrate;

[0006] The base includes a substrate and a photonic crystal layer, the photonic crystal layer and the substrate are integrally formed or the photonic crystal layer is located between the substrate and the light-emitting device layer; the photonic crystal layer is used to reflect the light in the display panel that matches the photonic bandgap of the photonic crystal layer to the picture display side of the display panel; wherein the light in the display panel that matches the photonic bandgap of the photonic crystal layer includes at least the light scattered from the light-emitting device layer to the substrate.

[0007] Optionally, the photonic crystal layer comprises a photonic crystal structure and a carrier, the photonic crystal structure is located inside the carrier, and the refractive index of the photonic crystal structure is different from the refractive index of the carrier;

[0008] Optionally, the refractive index of the photonic crystal structure is greater than the refractive index of the carrier.

[0009] Optionally, the photonic crystal structure includes a plurality of colloidal particle units periodically distributed in the carrier;

[0010] Optionally, the colloidal particle unit is composed of at least one colloidal particle;

[0011] Optionally, the colloidal particle unit is composed of a plurality of colloidal particles, and the plurality of colloidal particles are distributed in an orderly or disordered manner;

[0012] Optionally, the colloidal particle unit is composed of a plurality of colloidal particles, and the plurality of colloidal particles are distributed in a face-centered cubic structure or a body-centered cubic structure.

[0013] Optionally, the colloidal particles are monodispersed within the carrier;

[0014] Optionally, within the carrier, the monodispersity coefficient of the colloidal particles is less than or equal to 5%;

[0015] Optionally, within the carrier, the volume of the colloidal particles accounts for 30% to 50% of the total volume of the colloidal particles and the carrier.

[0016] Optionally, the particle size of the colloidal particles is 200 nm to 300 nm;

[0017] Optionally, the colloidal particles are made of polymer or metal oxide.

[0018] Optionally, the substrate is a flexible substrate, and the carrier and the substrate are integrally formed.

[0019] Optionally, the substrate is a flexible substrate, the substrate comprises at least two organic layers and at least two isolation protection layers, and the organic layers and the isolation protection layers are alternately arranged;

[0020] The display panel comprises at least two photonic crystal layers, the photonic crystal layers correspond to the organic layers one by one, and the carrier of the photonic crystal layer is integrally formed with the corresponding organic layer;

[0021] Optionally, the colloidal particles in different photonic crystal layers have different particle sizes.

[0022] Optionally, along the direction from the substrate to the light-emitting device layer, the particle sizes of the colloidal particles in different photonic crystal layers gradually decrease or increase.

[0023] Optionally, the light-emitting device layer includes red light-emitting devices, green light-emitting devices and blue light-emitting devices arranged in an array;

[0024] The photonic bandgap width of the photonic crystal layer includes a red light wavelength, a green light wavelength and a blue light wavelength.

[0025] Optionally, the display panel further comprises a circular polarizer, and the circular polarizer is located on a side of the light-emitting device layer away from the substrate.

[0026] According to another aspect of the present invention, a display device is provided. The display device includes the display panel as described in the above aspect.

[0027] According to the technical solution of the embodiment of the present invention, the display panel includes a substrate and a light-emitting device layer on the substrate. The substrate is provided to include a substrate and a photonic crystal layer, the photonic crystal layer and the substrate are integrally formed or the photonic crystal layer is located on the substrate, and the photonic crystal layer is used to reflect the light in the display panel that matches the photonic bandgap of the photonic crystal layer back to the picture display side of the display panel, wherein the light in the display panel that matches the photonic bandgap of the photonic crystal layer at least includes the light scattered to the substrate by the light-emitting device layer. In this way, when the light emitted by the light-emitting device in the light-emitting device layer of the display panel is irradiated to the substrate, it can be reflected back to the picture display side of the display panel by the substrate, thereby improving the light output intensity on the picture display side of the display panel. In this case, the driving current used to drive the light-emitting device in the light-emitting device layer to emit light can be appropriately reduced, thereby reducing the power consumption of the display panel while ensuring good display performance of the display panel.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of the display panel along the section line CC' is shown;

[0032] Figure 3 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a section line CC';

[0033] Figure 4 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a section line CC';

[0034] Figure 5 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a section line CC';

[0035] Figure 6 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a section line CC';

[0036] Figure 7 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a section line CC';

[0037] Figure 8 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] As mentioned in the background technology, the current OLED display panels generally have the problem of high power consumption. The inventors have found that the reason is that when the display panel is displayed, the ambient light in the environment where the display panel is located will affect the display of the display panel, such as the contrast and actual color of the display panel. In order to avoid the influence of ambient light on the display of the display panel, a layer of circular polarizer (POL) is set in the current OLED display panel; wherein the display panel includes a substrate and a light-emitting device layer on the substrate, and the circular polarizer is set on the side of the light-emitting device layer away from the substrate. Although the setting of the circular polarizer can largely eliminate the influence of ambient light on the display of the display panel, the setting of the circular polarizer will also reduce the light output intensity on the display side of the display panel screen. In order to achieve the light output intensity before the setting of the circular polarizer on the display side of the display panel screen, the driving current used to drive the light-emitting device in the light-emitting device layer to emit light is increased, thereby increasing the power consumption of the display panel, resulting in a large power consumption of the display panel.

[0040] In view of this, an embodiment of the present invention provides a display panel and a display device to improve the light output intensity on the display side of the display panel so as to appropriately reduce the driving current used to drive the light-emitting devices in the light-emitting device layer to emit light, thereby reducing the power consumption of the display panel while ensuring good display performance of the display panel.

[0041] Figure 1is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention, Figure 2 yes Figure 1 The cross-sectional structure diagram of the display panel along the cross-sectional line CC' is shown. Figure 1 and Figure 2 The display panel 100 includes: a substrate 110 and a light-emitting device layer 130 located on the substrate 110; the substrate 110 includes a substrate 111 and a photonic crystal layer 112, the photonic crystal layer 112 and the substrate 111 are integrally formed or the photonic crystal layer 112 is located between the substrate 111 and the light-emitting device layer 130; the photonic crystal layer 112 is used to reflect the light in the display panel that matches the photonic bandgap of the photonic crystal layer 112 to the picture display side of the display panel; the light in the display panel that matches the photonic bandgap of the photonic crystal layer 112 includes the light scattered from the light-emitting device layer 130 to the substrate 110.

[0042] Specifically, the display panel is, for example, an OLED display panel. The light-emitting device layer 130 may include light-emitting devices arranged in an array, and the light-emitting devices may be OLED devices, which are encapsulated by the encapsulation layer 140. The display panel may include an array substrate 120, and the array substrate 120 may be located on one side of the light-emitting device layer 130; for example, the array substrate 120 is located between the light-emitting device layer 130 and the substrate 110, wherein the substrate 110 may play a role in supporting the array substrate 120 and the light-emitting device layer 130. The array substrate 120 may include a pixel driving circuit arranged in an array, and the pixel driving circuit is used to provide a driving current to the corresponding light-emitting device to drive the corresponding light-emitting device to emit light. The light emitted by the light-emitting devices arranged in an array may constitute a display screen of the display panel, and the side of the display panel that presents the display screen to the user is the screen display side of the display panel.

[0043] The photonic crystal layer 112 includes a film layer of photonic crystals, and thus has the relevant properties of photonic crystals. Photonic crystals are a new type of optical material that presents a periodic distribution in space. Photonic crystals can modulate electromagnetic waves with corresponding wavelengths. When electromagnetic waves propagate in photonic crystals, they are modulated due to the presence of Bragg scattering, and the energy of the electromagnetic waves forms an energy band structure. Band gaps appear between energy bands, namely photonic band gaps, also known as photonic band gaps. Any photon with energy in the photonic band gap cannot enter the photonic crystal, that is, any light with a wavelength that matches the photonic band gap cannot enter the photonic crystal.

[0044] When the display panel displays, a larger portion of the light emitted by the light-emitting devices arranged in an array will be emitted from the screen display side of the display panel to form the display screen of the display panel, and a smaller portion will be scattered into the display panel, for example, scattered to the substrate 110. This phenomenon essentially means that no matter whether a circular polarizer is provided in the display panel or not, the light output intensity on the screen display side of the display panel needs to be improved. In order to achieve the target light output intensity, the current related technologies all increase the driving current used to drive the light-emitting devices, resulting in a larger power consumption of the display panel.

[0045] In this regard, in an embodiment of the present invention, a photonic crystal layer 112 is provided in the substrate 110, and the photonic bandgap of the photonic crystal layer 112 can be set to match the light emission wavelength of the light emitting device, so that when the light emitted by the light emitting device is irradiated to the substrate 110, it cannot enter the photonic crystal layer 112 but will be reflected by the photonic crystal layer 112 (that is, by the substrate 110) back to the picture display side of the display panel, that is, the light scattered to the substrate 110 by the light emitting devices arranged in an array is reflected by the substrate 110 back to the picture display side of the display panel, thereby improving the light output intensity on the picture display side of the display panel. When the light output intensity on the picture display side of the display panel is improved, the driving current used to drive the light emitting device to emit light can be appropriately reduced, the driving current in the display panel is reduced, and the corresponding power consumption of the display panel is reduced. In this way, the embodiment of the present invention reduces the power consumption of the display panel while ensuring good display performance of the display panel. That is, the display panel of the embodiment of the present invention can achieve a strong light output intensity while adopting a small driving current, thereby achieving good display performance with lower power consumption; at the same time, the light wave energy scattered to the substrate can also be effectively recycled, which not only avoids the loss, waste and pollution of light wave energy in the display panel but also achieves low power consumption and good display performance of the display panel.

[0046] Among them, optionally, the light-emitting device may include a red light-emitting device that emits red light, a green light-emitting device that emits green light, and a blue light-emitting device that emits blue light, and the photon bandgap width of the photonic crystal layer 112 may be set to include the wavelength of red light, the wavelength of green light, and the wavelength of blue light. Therefore, when the red light-emitting device, the green light-emitting device, and the blue light-emitting device emit red light, green light, and blue light, respectively, when they are irradiated to the substrate 110, they cannot enter the photonic crystal layer 112 but will be reflected by the photonic crystal layer 112 back to the picture display side of the display panel, thereby improving the light output intensity on the picture display side of the display panel.

[0047] It should be noted that the thickness of each film layer presented in the drawings of the embodiment of the present invention does not strictly represent the actual thickness of each film layer. This embodiment is illustrated and presented in this way only to highlight the structure of each film layer. The actual thickness of each film layer can be set according to actual conditions when implementing the technical solution.

[0048] In some other embodiments, the light irradiated onto the substrate 110 of the display panel may also include ambient light in the environment where the display panel is located, and the ambient light is incident from the picture display side of the display panel and finally irradiated onto the substrate 110. The substrate 110 of the embodiment of the present invention may also reflect the light that matches the photon bandgap of the photonic crystal layer 112 among the ambient light irradiated onto the substrate 110 back to the picture display side of the display panel, thereby further improving the light output intensity on the picture display side of the display panel, and further reducing the driving current used to drive the light-emitting device to emit light, and further reducing the power consumption of the display panel.

[0049] In the above technical solution, the substrate 111 can be a rigid substrate, which can be made of materials such as glass. The substrate 111 can also be a flexible substrate, which can be made of materials such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyarylate (PAR) and / or glass fiber reinforced plastic (FRP). Figure 2 By way of example, when the substrate 111 is a rigid substrate, the photonic crystal layer 112 can be disposed on the substrate 111, so that the substrate 111 supports the photonic crystal layer 112, ensuring that the photonic crystal layer 112 improves the light intensity on the display side of the display panel. When the substrate 111 is a flexible substrate, the photonic crystal layer 112 and the substrate 111 can be integrally formed, which can simplify the manufacturing process of the display panel while ensuring that the photonic crystal layer 112 improves the light intensity of the display panel, and reduces the number of film layers in the display panel, thereby reducing the cost of the display panel. At this time, the substrate 111 supports the photonic crystal layer 112.

[0050] Based on the above technical solution, Figure 3 FIG. 1 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention along a cross-sectional line CC'. Figure 3 As an embodiment of the present invention, optionally, the photonic crystal layer 112 includes a photonic crystal structure 1121 and a carrier 1122, the photonic crystal structure 1121 is located within the carrier 1122, the carrier 1122 plays the role of supporting the photonic crystal structure 1121, and the refractive index of the photonic crystal structure 1121 is different from the refractive index of the carrier 1122.

[0051] The formation conditions of the photonic crystal include periodic changes in the refractive index. Accordingly, in the embodiment of the present invention, the photonic crystal structure 1121 may be a periodically distributed structure, and the refractive index of the photonic crystal structure 1121 is different from the refractive index of the carrier 1122, so that the photonic crystal structure 1121 and the carrier 1122 are combined to form a film layer including photonic crystals, that is, the photonic crystal layer 112.

[0052] The refractive index of the photonic crystal structure 1121 may be greater than the refractive index of the carrier 1122, or the refractive index of the carrier 1122 may be greater than the refractive index of the photonic crystal structure 1121. Considering that the refractive index of the substrate 111 is generally small and close to the refractive index of air, in one embodiment of the present invention, the refractive index of the photonic crystal structure 1121 is optionally set to be greater than the refractive index of the carrier 1122, so that the carrier 1122 is set to have a smaller refractive index, thereby facilitating the integrated molding of the carrier 1122 and the substrate 111, and simplifying the manufacturing process of the display panel.

[0053] For example, Figure 4 is a schematic diagram of a cross-sectional structure of another display panel provided by an embodiment of the present invention along a cross-sectional line CC', with reference to Figure 4 , the substrate 111 is a flexible substrate, the material of the substrate 111 includes PI with a relatively low refractive index, the material of the carrier 1122 is the same as that of the substrate 111, and the carrier 1122 and the substrate 111 are integrally formed. This type of arrangement can also be understood as the substrate 111 itself serving as the carrier 1122 of the photonic crystal structure 1121, the photonic crystal structure 1121 being directly formed within the substrate 111, and the photonic crystal structure 1121 and the substrate 111 being combined to form a film layer including photonic crystals, namely, the photonic crystal layer 112. Thus, while ensuring that the photonic crystal layer 112 has an effect of improving the light output intensity of the display panel, the manufacturing process of the display panel is simplified, the number of film layers in the display panel is reduced, and the types of materials used to manufacture the display panel are reduced (there is no need to separately set up a carrier 1122 of a specific material), thereby reducing the cost of the display panel.

[0054] In addition, in the embodiment of the present invention, when the substrate 111 is a flexible substrate, the specific configuration of the substrate 111 can be various. Figure 5 is a schematic diagram of a cross-sectional structure of another display panel provided by an embodiment of the present invention along a cross-sectional line CC', with reference to Figure 5As an embodiment of the present invention, optionally, the substrate 111 is a flexible substrate 111, the substrate 111 includes at least two organic layers 1111 and at least two isolation protection layers 1112, and the organic layers 1111 and the isolation protection layers 1112 are alternately arranged; accordingly, the display panel includes at least two photonic crystal layers 112, the photonic crystal layers 112 and the organic layers 1111 correspond one to one, and the carrier 1122 of the photonic crystal layer 112 is integrally formed with the corresponding organic layer 1111.

[0055] Specifically, when the material of the substrate 111 is an organic material (such as a PI material), the melting point of the substrate 111 is relatively low. When the array substrate 120 is formed on the substrate 111 by a yellow light process, the high temperature step involved in the yellow light process can easily cause adverse effects on the substrate 111. Therefore, an isolation protection layer 1112 is provided on both sides of the substrate 111 to protect the substrate 111, so as to avoid affecting the performance of the substrate 111 when the array substrate 120 is formed; wherein the material of the isolation protection layer 1112 is, for example, polyethylene (BL). Then, when the substrate 111 is composed of multiple organic layers 1111, both sides or at least one side of each organic layer 1111 can be provided with an isolation protection layer 1112 for protection; and each organic layer 1111 can be used as a carrier 1122 of the photonic crystal structure 1121, and each organic layer 1111 combined with the corresponding photonic crystal structure 1121 can form a film layer including photonic crystals, that is, a photonic crystal layer 112. When the substrate 110 of the display panel includes a multi-layer photonic crystal layer 112, the multi-layer photonic crystal layer 112 may have different photonic band gaps, so that the substrate 110 can reflect more wavelengths of light irradiated to the substrate 110 back to the image display side of the display panel, thereby improving the light intensity of the image displayed in the multi-wavelength range of the display panel.

[0056] Based on the above technical solutions, in the embodiment of the present invention, the specific structural settings of the photonic crystal structure 1121 include multiple ones, and several of them are exemplified below, but they are not intended to limit the present invention.

[0057] Continue to refer Figure 4 As an embodiment of the present invention, optionally, the photonic crystal structure 1121 includes a plurality of colloidal particle units 1123 that are periodically distributed in the carrier.

[0058] Specifically, the refractive index of the colloidal particle unit 1123 is different from the refractive index of the carrier, and the plurality of colloidal particle units 1123 are periodically distributed within the carrier, thereby satisfying the formation conditions of the photonic crystal and forming a film layer including the photonic crystal.

[0059] Continue to refer Figure 4In one embodiment of the present invention, optionally, the colloidal particle unit 1123 is composed of at least one colloidal particle 1124 .

[0060] Specifically, the refractive index of the colloidal particles 1124 is different from the refractive index of the carrier. The material of the colloidal particles 1124 may be a polymer or a metal oxide. Metal oxides are, for example, zinc oxide (ZnO), cuprous oxide (Cu2O) or ferrous oxide (Fe3O4). In addition, illustratively, when the material of the carrier is PI, since the commonly used solvent for PI is methyl pyrrolidone (NMP), the polymer used to make the colloidal particles 1124 must be a polymer that is insoluble in NMP. Based on this, when the colloidal particle unit 1123 is composed of one colloidal particle 1124, multiple colloidal particles 1124 are periodically distributed within the carrier, so that the formation conditions of the photonic crystal can be met to form a film layer including the photonic crystal.

[0061] refer to Figure 6 , Figure 6 It is a schematic diagram of the cross-sectional structure of another display panel provided by an embodiment of the present invention along the section line CC'. In another implementation manner of the present invention, optionally, the colloidal particle unit 1123 is composed of a plurality of colloidal particles 1124, and the plurality of colloidal particles 1124 are distributed in an orderly or disordered manner.

[0062] Specifically, when the plurality of colloidal particles 1124 in the colloidal particle unit 1123 are orderly distributed, the plurality of colloidal particles 1124 in the plurality of colloidal particle units 1123 are arranged orderly throughout the entire process within the carrier, which can meet the conditions for forming a photonic crystal, and form a photonic crystal film layer including a photonic crystal. When the plurality of colloidal particles 1124 in the colloidal particle unit 1123 are disorderly distributed, the plurality of colloidal particles 1124 in the plurality of colloidal particle units 1123 are arranged disorderly in the short range and orderly in the long range within the carrier, which can still meet the conditions for forming a photonic crystal, and form a film layer including a photonic crystal.

[0063] In another embodiment of the present invention, optionally, the colloidal particle unit 1123 is composed of a plurality of colloidal particles 1124, and the plurality of colloidal particles 1124 are distributed in a face-centered cubic structure or a body-centered cubic structure. Similarly, the plurality of colloidal particles 1124 of the plurality of colloidal particle units 1123 are arranged in a short-range disordered and long-range orderly manner within the carrier, satisfying the formation conditions of a photonic crystal and forming a film layer including a photonic crystal.

[0064] In the above technical solution, the colloidal particles 1124 are monodispersed within the carrier 1122 to ensure that multiple colloidal particles 1124 can form a periodic arrangement within the carrier 1122. Wherein, if the monodispersity coefficient of the colloidal particles 1124 is too large, it will also affect the formation of the periodic arrangement of multiple colloidal particles 1124 within the carrier 1122. Therefore, in one embodiment of the present invention, optionally, the monodispersity coefficient of the colloidal particles 1124 within the carrier 1122 is less than or equal to 5%, thereby ensuring the reliable formation of the periodic arrangement of multiple colloidal particles 1124 within the carrier 1122, so as to ensure the good performance of the photonic crystal layer. Wherein, monodispersity refers to the uniformity of a certain parameter of a substance. In this embodiment, the monodispersity of the colloidal particles 1124 means that the particle size of the colloidal particles 1124 is uniform. The monodispersity coefficient of the colloidal particles 1124 is 0 to 5%, which means that the particle size deviation range of the colloidal particles 1124 is 0 to 5% when the colloidal particles 1124 are monodispersed.

[0065] If the volume proportion of the colloidal particles 1124 in the carrier 1122 is too small, it is not easy to form a periodic arrangement in the carrier 1122; if the volume proportion is too large, it is easy to affect the formation of the carrier 1122, for example, the formed carrier 1122 may not have sufficient supporting capacity, etc. Therefore, in one embodiment of the present invention, optionally, the volume of the colloidal particles 1124 in the carrier 1122 accounts for 30% to 50% of the total volume of the colloidal particles and the carrier, thereby ensuring not only the reliable formation of the periodic arrangement of the colloidal particles 1124 in the carrier 1122, but also the good formation of the carrier 1122, thereby ensuring the good performance of the photonic crystal layer.

[0066] The size of the colloidal particles 1124 will affect the photon bandgap width of the photonic crystal layer 112, and the photon bandgap width of the photonic crystal layer 112 can be adjusted by adjusting the size of the colloidal particles 1124. As an embodiment of the present invention, optionally, the particle size of the colloidal particles 1124 is set to 200nm to 300nm to ensure that the photon bandgap width of the photonic crystal layer 112 includes a wavelength within the visible light range (390nm to 780nm), thereby ensuring that the substrate 110 reflects the visible light irradiated to the substrate 110 back to the picture display side of the display panel, thereby improving the light intensity of the picture displayed by the display panel within the visible light range.

[0067] In addition, in the embodiment of the present invention, continue to refer to Figure 5When the substrate 110 of the display panel includes a plurality of photonic crystal layers 112, optionally, the particle sizes of the colloidal particles in different photonic crystal layers are different; the particle sizes of the colloidal particles 1124 in the photonic crystal structure 1121 of at least two photonic crystal layers 112 are different, so as to ensure that at least two photonic crystal layers 112 have different photonic bandgap, so as to facilitate the substrate 110 to reflect more wavelengths of light irradiated to the substrate 110 back to the picture display side of the display panel, thereby improving the light intensity of the picture displayed in the multi-wavelength range of the display panel.

[0068] Optionally, along the direction from the substrate to the light-emitting device layer, the particle sizes of the colloidal particles in different photonic crystal layers gradually decrease or increase, thereby adjusting the light emission order of reflected light of different wavelengths reflected to the display side of the display panel.

[0069] Figure 7 is a schematic diagram of a cross-sectional structure of another display panel provided by an embodiment of the present invention along a cross-sectional line CC', with reference to Figure 7 The display panel further includes a circular polarizer 150 , which is located on a side of the light emitting device layer 130 away from the substrate 110 .

[0070] Specifically, the circular polarizer 150 can largely eliminate the influence of ambient light on the display of the display panel, for example, avoiding the influence on the contrast and actual color of the display panel; and, in the embodiment of the present invention, since the photonic crystal layer of the substrate can reflect the light scattered from the display panel to the substrate back to the picture display side of the display panel, even if the circular polarizer is provided, the display panel of the embodiment of the present invention still has a high light output intensity, and can also have low power consumption. Accordingly, the display panel provided by the embodiment of the present invention has a high contrast ratio, and effectively recycles the light wave energy scattered to the substrate, avoiding the loss, waste and pollution of the light wave energy in the display panel, and also has good display performance (the light output intensity on the picture display side of the display panel is high), and also has low power consumption (the driving current in the display panel is small); and the manufacturing process is also simple, and the number of film layers and the types of manufacturing materials in the display panel are small, and the cost of the display panel is also low.

[0071] Figure 8 is a schematic diagram of a display device provided by an embodiment of the present invention, with reference to Figure 8 The embodiment of the present invention further provides a display device 200, such as an OLED display device, and the display device 200 includes a display panel as described in any of the above embodiments. The display device and the display panel provided in the embodiment of the present invention belong to the same inventive concept and can achieve the same technical effect, and the repeated contents will not be repeated here.

[0072] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: A substrate and a light emitting device layer located on the substrate; The substrate comprises a substrate and a photonic crystal layer, wherein the photonic crystal layer and the substrate are integrally formed or the photonic crystal layer is located between the substrate and the light-emitting device layer; the photonic crystal layer is used to reflect the light in the display panel that matches the photonic bandgap of the photonic crystal layer to the picture display side of the display panel; wherein the light in the display panel that matches the photonic bandgap of the photonic crystal layer includes the light scattered from the light-emitting device layer to the substrate; The photonic crystal layer comprises a photonic crystal structure and a carrier, the photonic crystal structure is located in the carrier, and the refractive index of the photonic crystal structure is different from the refractive index of the carrier; The substrate is a flexible substrate, comprising at least two organic layers and at least two isolation protection layers, wherein the organic layers and the isolation protection layers are alternately arranged; The display panel comprises at least two photonic crystal layers, the photonic crystal layers correspond to the organic layers one by one, and the carrier of the photonic crystal layer is integrally formed with the corresponding organic layer; The colloidal particles in different photonic crystal layers have different particle sizes; Along the direction from the substrate to the light-emitting device layer, the particle sizes of the colloidal particles in different photonic crystal layers gradually decrease or increase; The colloidal particles are made of polymer or metal oxide; In the carrier, the volume of the colloidal particles accounts for 30% to 50% of the total volume of the colloidal particles and the carrier.

2. The display panel according to claim 1, characterized in that: The refractive index of the photonic crystal structure is greater than the refractive index of the carrier.

3. The display panel according to claim 2, characterized in that: The photonic crystal structure includes a plurality of colloidal particle units periodically distributed in the carrier.

4. The display panel according to claim 3, characterized in that: The colloidal particle unit is composed of at least one colloidal particle.

5. The display panel according to claim 4, characterized in that: The colloidal particle unit is composed of a plurality of colloidal particles, and the plurality of colloidal particles are distributed in an orderly or disordered manner.

6. The display panel according to claim 4, characterized in that: The colloidal particle unit is composed of a plurality of colloidal particles, and the plurality of colloidal particles are distributed in a face-centered cubic structure or a body-centered cubic structure.

7. The display panel according to claim 4, characterized in that: The colloidal particles are monodispersed within the carrier.

8. The display panel according to claim 7, characterized in that: The monodispersity coefficient of the colloidal particles is less than or equal to 5%.

9. The display panel according to claim 4, characterized in that: The particle size of the colloidal particles is 200nm to 300nm.

10. The display panel according to claim 2, characterized in that: The substrate is a flexible substrate, and the carrier and the substrate are integrally formed.

11. The display panel according to claim 1, characterized in that: The light emitting device layer includes red light emitting devices, green light emitting devices and blue light emitting devices arranged in an array; The photonic bandgap width of the photonic crystal layer includes a red light wavelength, a green light wavelength and a blue light wavelength.

12. The display panel according to claim 1, characterized in that: The display panel further includes a circular polarizer, and the circular polarizer is located on a side of the light emitting device layer away from the substrate.

13. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-12.

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