Display panel, display device and method for manufacturing display panel

Abstract

The embodiment of the present invention discloses a display panel, a display device and a method for preparing a display panel. The display panel includes a base substrate; a plurality of light-emitting elements located on one side of the base substrate; a color resist layer located on the light-emitting side of the light-emitting element, the color resist layer includes a color resist corresponding to the light-emitting element, and the color resist transmits the light emitted by the corresponding light-emitting element; a two-dimensional material layer located on the light-emitting side of the light-emitting element, the two-dimensional material layer includes a plurality of graphic structures, one end of the graphic structure is connected to a driving signal end, and the driving signal end is a driving signal loaded by the graphic structure, so that the width of the transmission spectrum of the graphic structure is smaller than the width of the transmission spectrum of the color resist. The embodiment of the present invention adds a two-dimensional material layer on the basis of the color resist layer, so as to make the purity of the sub-pixel light higher, thereby improving the light saturation of the display panel and improving the display quality of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to display panel technology, and more particularly to a display panel, a display device, and a method for manufacturing a display panel. Background Art

[0002] With the continuous development of display technology, bendable screens are becoming more and more popular among consumers. Among them, CFOT (Color Filter On TFE) technology, as an emerging bendable screen technology, has attracted much attention. CFOT technology deposits a color film after thin film encapsulation (TFE), and uses the color film to replace the polarizer for light filtering, thereby reducing the thickness of the screen and achieving bendability.

[0003] However, due to the limitation of the color filter's own spectrum, the light saturation of the display panel using CFOT technology is insufficient, which in turn leads to poor display quality of the display panel. Summary of the invention

[0004] Embodiments of the present invention provide a display panel, a display device and a method for manufacturing a display panel, so as to improve the light saturation of the display panel and thus enhance the display quality of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0006] substrate substrate;

[0007] A plurality of light emitting elements located on one side of the base substrate;

[0008] A color resist layer located at the light-emitting side of the light-emitting element, the color resist layer comprising a color resist corresponding to the light-emitting element, the color resist transmitting the light emitted by the corresponding light-emitting element;

[0009] A two-dimensional material layer is located on the light-emitting side of the light-emitting element, and the two-dimensional material layer includes a plurality of graphic structures. One end of the graphic structure is connected to a driving signal end, and the driving signal end is a driving signal loaded on the graphic structure, so that the width of the transmission spectrum of the graphic structure is smaller than the width of the transmission spectrum of the color resistance.

[0010] In a second aspect, an embodiment of the present invention further provides a display device, comprising the above-mentioned display panel.

[0011] In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, comprising:

[0012] Making a light emitting element on one side of the substrate;

[0013] A color resist layer and a two-dimensional material layer are formed on the side of the light emitting element away from the base substrate.

[0014] The display panel in the embodiment of the present invention includes: a base substrate; a plurality of light-emitting elements located on one side of the base substrate; a color resist layer located on the light-emitting side of the light-emitting element, the color resist layer includes a color resist corresponding to the light-emitting element, and the color resist transmits the light emitted by the corresponding light-emitting element; a two-dimensional material layer located on the light-emitting side of the light-emitting element, the two-dimensional material layer includes a plurality of graphic structures, one end of the graphic structure is connected to the driving signal end, and the driving signal end is a driving signal loaded by the graphic structure, so that the width of the transmission spectrum of the graphic structure is smaller than the width of the transmission spectrum of the color resist. Since the spectral width of the light that can pass through the two-dimensional material layer is narrower than the spectral width of the light that can pass through the color resist, adding a two-dimensional material layer on the basis of the color resist layer can make the purity of the sub-pixel light higher, thereby improving the light saturation of the display panel and improving the display quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a common OLED display panel in the prior art;

[0016] Figure 2 This is a structural schematic diagram of an OLED display panel using CFOT technology in the prior art;

[0017] Figure 3 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0018] Figure 4 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of a graphical structure provided by an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of another graphic structure provided by an embodiment of the present invention;

[0021] Figure 7 A schematic diagram of a structure in which a plurality of identical graphic structures are connected provided by an embodiment of the present invention;

[0022] Figure 8 A schematic diagram of a graphic structure provided by an embodiment of the present invention;

[0023] Fig. 9 A schematic diagram of another graphic structure provided by an embodiment of the present invention;

[0024] Fig.10 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second" and the like are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] Figure 1 is a schematic diagram of the structure of a common OLED display panel in the prior art. Figure 2 This is a schematic diagram of the structure of an OLED display panel using CFOT technology in the prior art, refer to Figure 1 and Figure 2 . In the prior art, an ordinary OLED display panel is composed of a polyimide (PI) layer 11, an array substrate (Array) layer 12, an OLED layer 13, a thin film encapsulation (TFE) layer 14, a touch (TPOT) layer 15, a polarizing (POL) layer 16 and a protective (Cover) layer 17 stacked in sequence. Among them, the POL layer 16 has a high hardness and is not easy to bend. It constitutes an obstacle to the development and application of flexible screen technology. Therefore, CFOT technology came into being. The display panel using CFOT technology uses a color film (CFOT) layer 18 instead of the POL layer 16. The light emitted by the OLED layer 13 is filtered by color resistance, so the light emitted by the OLED layer 13 can be filtered without using the POL layer 16 that is not easy to bend, so as to obtain relatively pure sub-pixel light. Not only does it make the display panel easier to bend, but since the thickness of the CFOT layer 18 is much lower than that of the POL layer 16, the overall thickness of the display panel is also reduced. However, the display panel using CFOT technology still has defects. Due to the limitation of the spectrum of the color resistance in the CFOT layer 18, the purity of the light obtained after the pure color light is filtered by the CFOT layer 18 is not high enough, resulting in insufficient light saturation of the display panel, which in turn leads to low picture quality of the display panel.

[0028] Figure 3 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention, Figure 4 A schematic diagram of another display panel provided by an embodiment of the present invention, referring to Figure 3 and Figure 4 An embodiment of the present invention provides a display panel, comprising:

[0029] A base substrate 21; a light emitting element layer 22 located on one side of the base substrate 21, wherein the light emitting element layer includes a plurality of light emitting elements ( Figure 3 and Figure 4 The color resist layer 23 is located on the light-emitting side of the light-emitting element layer 22, the color resist layer 23 includes a color resist corresponding to the light-emitting element, and the color resist transmits the light emitted by the corresponding light-emitting element; the two-dimensional material layer 24 is located on the light-emitting side of the light-emitting element layer 22, the two-dimensional material layer 24 includes a plurality of graphic structures, one end of the graphic structure is connected to the driving signal end, the driving signal end is a driving signal loaded by the graphic structure, so that the width of the transmission spectrum of the graphic structure is smaller than the width of the transmission spectrum of the color resist.

[0030] The figure only shows a part of the film layer structure of the display panel in the embodiment of the present invention, and any film layer that does not affect the function of the embodiment of the present invention can be added. Figure 3 or Figure 4The upper surface of the display panel, the lower surface of the display panel, or the film structure of the display panel shown. The light-emitting element may be an OLED light-emitting element, or a Mini LED light-emitting element, or a Micro LED light-emitting element. The present invention is not limited to the specific type of the light-emitting element. The color resistance on the color resistance layer 23 is arranged corresponding to the light-emitting element, and the color of the light that the color resistance can transmit is the same color as the color of the light that the light-emitting element can emit. For example, the red color resistance is arranged corresponding to the red light-emitting element; the green color resistance is arranged corresponding to the green light-emitting element; and the blue color resistance is arranged corresponding to the blue light-emitting element. Taking the red light-emitting element as an example, after the red light emitted by the red light-emitting element passes through the red color resistance, due to the filtering effect of the red color resistance, the light that deviates more from the red light spectrum can be filtered out, so that the purity of the red light passing through the red color resistance is improved. The two-dimensional material layer 24 is arranged together with the color resistance layer 23 on the light-emitting side of the light-emitting element layer 22. The two-dimensional material layer 24 can be closer to the light-emitting element layer 22 relative to the color resistance layer 23, or it can be farther away from the light-emitting element layer 22 relative to the color resistance layer 23. The two-dimensional material layer 24 can be composed of two-dimensional materials. The embodiment of the present invention does not limit the microstructure of the two-dimensional material layer 24 and the specific type of the two-dimensional material. For example, the two-dimensional material layer 24 can be composed of a two-dimensional planar material such as graphene, and graphene has a very fast electron mobility, an energy band structure that is an incompletely opened cone structure, and a visible light band transmittance of more than 99.9%, which is an ideal material for the two-dimensional material layer 24. Since the molecules in the two-dimensional material layer 24 can be distributed in a single layer and orderly on a certain surface, it is called a two-dimensional material layer. On the basis of the two-dimensional material layer 24, a plurality of graphic structures can be set, and the graphic structure can be a structure that forms LC resonance, so that the graphic structure can generate electromagnetic waves coupled with electromagnetic waves in the visible light frequency band under the excitation of the driving signal, so that the two-dimensional material layer 24 forms a planar superstructure. The planar superstructure is an artificially designed array structure that realizes the control of electromagnetic waves through the coupling effect between electromagnetic fields. In theory, it can realize the functions of total absorption, total reflection, negative refractive index, etc. of electromagnetic waves. The Fermi level of the planar superstructure can be adjusted by adjusting the doping degree of other substances in the graphene according to actual needs. The coupled electromagnetic wave frequency of the planar superstructure can be modulated by adjusting the structural design such as the size and shape of the graphic structure, adjusting the Fermi level of the planar superstructure, and adjusting the driving voltage of the driving signal, thereby adjusting the frequency of the resonance peak of the planar superstructure, thereby achieving a larger resonance peak at the required electromagnetic wave frequency. By adjusting the frequency of the resonance peak within the required range, and the range is within the width of the transmission spectrum of the color resistance, the light beyond the required range can be further filtered out, the purity of the light emitted by the sub-pixel can be improved, and the light saturation of the display panel can be improved, thereby improving the display quality of the display panel.

[0031] Figure 5 A schematic diagram of a graphical structure provided by an embodiment of the present invention, referring to Figure 5 Optionally, the graphic structure includes a first annular structure 2401 and a second annular structure 2402 symmetrically arranged about a first direction and a second direction, the first annular structure 2401 and the second annular structure 2402 include a common portion 2403 extending along the first direction; the first annular structure 2401 includes a first opening 24011, the second annular structure 2402 includes a second opening 24021, the first opening 24011 and the second opening 24021 are symmetrically arranged about the common portion 2403, and the direction from the first opening 24011 to the second opening 24021 is parallel to the second direction; wherein the first direction and the second direction are perpendicular.

[0032] The first ring structure 2401 and the second ring structure 2402 have two openings arranged opposite to each other, wherein the first opening 24011 and the second opening 24021 form a capacitor, and the common part 2403 shared by the first ring structure 2401 and the second ring structure 2402 forms an inductor, so that the first ring structure 2401 and the second ring structure 2402 form an LC resonance structure. After the driving signal is applied to the first ring structure 2401, the first ring structure 2401 oscillates as an oscillation circuit, and an induced voltage with periodic changes in magnitude and direction is generated at both ends of the common part 2403, and the magnitude and direction of the induced current flowing through the common part 2403 change with the periodic changes of the induced voltage. The induced voltage and induced current of the first ring structure 2401 are transmitted to the second ring structure 2402 through the common part 2403, so that the second ring structure 2402 also oscillates. The resonant frequency of the second ring structure 2402 can be adjusted by adjusting the opening distance and size of the second opening 24021, and then the resonant frequency of the second ring structure 2402 is adjusted to be the same as the resonant frequency of the first ring structure 2401, and the two resonant rings are coupled. The light spectrum position and the resonance peak size of the high transmittance area after coupling are controlled by adjusting the voltage of the driving signal. In order to filter the light emitted by the light-emitting element and improve the purity of the light emitted by the sub-pixel. The graphic structure can be laid at all the sub-pixel positions of a certain color light to form a two-dimensional material layer. The graphic structure can also be laid at all the sub-pixel positions to form a two-dimensional material layer. When laying the graphic structure at all the sub-pixel positions, the graphic structure of different sizes can be used for laying according to the different luminous colors of the sub-pixels. For example, the display panel has sub-pixels of three colors: red, green and blue. According to the color of the sub-pixel, a graphic structure of a first size can be prepared on the red sub-pixel, a graphic structure of a second size can be prepared on the green sub-pixel, and a graphic structure of a third size can be prepared on the blue sub-pixel. The size of the sub-pixel graphic structure can be obtained by simulation software according to the light-emitting color of the light-emitting unit of the sub-pixel. Different driving signal voltages can also be used to drive the graphic structure according to the different luminous colors of the sub-pixels. For example, the display panel has sub-pixels of three colors: red, green and blue. The graphic structure at the red sub-pixel position can be driven by a driving signal of a first voltage, the graphic structure at the green sub-pixel position can be driven by a driving signal of a second voltage, and the graphic structure at the blue sub-pixel position can be driven by a driving signal of a third voltage. By setting different graphic structure sizes and driving signal voltages for sub-pixels of different colors, the light spectrum position and resonance peak size of the high-transmittance area of ​​the two-dimensional material layer can be controlled, and the light that can be transmitted by the color resistance layer 23 and exceeds the required range can be further filtered out, thereby improving the purity of the light emitted by all sub-pixels, thereby improving the light saturation of the display panel and improving the display quality of the display panel.

[0033] Figure 6A schematic diagram of another graphical structure provided by an embodiment of the present invention, referring to Figure 6 Optionally, the first annular structure 2401 includes a first branch portion 24012 extending along the first direction and a second branch portion 24013 extending along the second direction, and the common portion 2403, the first branch portion 24012 and the second branch portion 24013 are connected to form the first annular structure 2401; the second annular structure 2402 includes a third branch portion 24022 extending along the first direction and a fourth branch portion 24023 extending along the second direction, and the common portion 2403, the third branch portion 24022 and the fourth branch portion 24023 are connected to form the second annular structure 2402.

[0034] Among them, the first opening 24011 and the common part 2403 are connected to form a first ring structure 2401 through the first branch part 24012 and the second branch part 24013, and the first opening 24011 and the common part 2403 are connected to form a second ring structure 2402 through the third branch part 24022 and the fourth branch part 24023, which connects the opening and the common part 2403, so that the first ring structure 2401 and the second ring structure 2402 form a complete LC oscillation circuit.

[0035] Figure 7 A schematic diagram of a structure of connecting multiple identical graphic structures provided by an embodiment of the present invention, referring to Figure 7 Optionally, a plurality of identical graphic structures are arranged along the second direction; the third branch portion 24022 in a graphic structure extends along the first direction to the first branch portion 24012 of an adjacent graphic structure.

[0036] The driving signal can be transmitted from one graphic structure to another adjacent graphic structure by connecting the extended third branch portion 24022 with the first branch portion 24012. After the transmission is done one by one, the graphic structures of the entire two-dimensional material layer are driven by the driving signal.

[0037] Figure 8 A schematic diagram of a graphic structure provided by an embodiment of the present invention, referring to Figure 8 Optionally, the graphic structure includes a first graphic structure 241, a second graphic structure 242 and a third graphic structure 243; the color resist layer 23 includes a red color resist 231, a green color resist 232 and a blue color resist 233, the first graphic structure 241 corresponds to the red color resist 231, the second graphic structure 242 corresponds to the green color resist 232, and the third graphic structure 243 corresponds to the blue color resist 233.

[0038] The display panel includes red sub-pixels, green sub-pixels and blue sub-pixels. The color resist layers corresponding to the above sub-pixels include red color resist 231, green color resist 232 and blue color resist 233 respectively. Since the luminous colors of different sub-pixels are different, the graphic structures corresponding to each color resist are different. The size of the graphic structure such as the opening distance of the graphic structure opening can be set as needed to meet the filtering requirements of the corresponding color sub-pixels and improve the light purity of the sub-pixels.

[0039] Continue to refer Figure 8 Optionally, the projection area of ​​the first graphic structure 241 on the substrate is a1, the projection area of ​​the second graphic structure 242 on the substrate is a2, the projection area of ​​the third graphic structure 243 on the substrate is a3, and a2>a3>a1.

[0040] Among them, the first graphic structure 241 corresponds to the red color resist 231, the second graphic structure 242 corresponds to the green color resist 232, and the third graphic structure 243 corresponds to the blue color resist 233. The result obtained by simulation through relevant software is that the graphic structure of the two-dimensional material layer needs to be set so that the projection area of ​​the second graphic structure 242 of the green sub-pixel on the substrate substrate is larger than the projection area of ​​the third graphic structure 243 of the blue sub-pixel on the substrate substrate is larger than the projection area of ​​the first graphic structure 241 of the red sub-pixel on the substrate substrate, wherein the specific size of the graphic structure can be determined according to the simulation results of the software. In the above manner, filtering can be achieved for each color sub-pixel, thereby improving the light purity of the sub-pixel.

[0041] Fig. 9 A schematic diagram of another graphic structure provided by an embodiment of the present invention, referring to Fig. 9 Optionally, the graphic structure includes a fourth graphic structure 244 and a fifth graphic structure 245; the color resist layer 23 includes a red color resist 231, a green color resist 232 and a blue color resist 233, the fourth graphic structure 244 corresponds to the green color resist 232, and the fifth graphic structure 245 corresponds to the blue color resist 233; the projection area of ​​the fourth graphic structure on the base substrate is a4, and the projection area of ​​the fifth graphic structure on the base substrate is a5, and a4>a5.

[0042] Among them, since the red color resist 231 has a good filtering ability, the red light after filtering by the red color resist 231 has a high purity, so the two-dimensional material layer with a pattern structure can be set only in the green and blue sub-pixels, and the sizes of the fourth pattern structure and the fifth pattern structure can be different, and the projection area a4 of the fourth pattern structure on the base substrate is larger than the projection area a5 of the fifth pattern structure on the base substrate. Thereby, the light purity of the green and blue sub-pixels is improved.

[0043] Optionally, the two-dimensional material layer is formed of a single two-dimensional material or a heterojunction of two-dimensional materials.

[0044] The material forming the two-dimensional material layer may be a single two-dimensional material or a heterojunction formed by two two-dimensional materials. A heterojunction refers to a cross-sectional area formed by the contact of two different materials. Usually, the condition for forming a heterojunction is that the two materials have similar crystal structures, similar atomic spacing and thermal expansion coefficients. Specifically, it can be formed by epitaxial growth, vacuum deposition and other technologies. Optionally, a single two-dimensional material or a two-dimensional material constituting a heterojunction may include graphene, molybdenum sulfide, tungsten sulfide or tungsten selenide.

[0045] Optionally, the two-dimensional material layer is located between the color resist layer and the light-emitting element, or the two-dimensional material layer is located on a side of the color resist layer away from the light-emitting element.

[0046] Among them, Figure 3 or Figure 4 As shown, the light emitted by the light emitting element can first pass through the two-dimensional material layer, be filtered by the two-dimensional material layer, and then be filtered by the color-resistance layer. Alternatively, the light can first pass through the color-resistance layer, be filtered by the color-resistance layer, and then be filtered by the two-dimensional material layer.

[0047] Optionally, the display panel provided in the embodiment of the present invention further includes a driving chip, which is connected to the driving signal terminal and is used to provide a driving signal to the driving signal terminal.

[0048] Among them, the driving chip can be a chip that only provides a driving signal for the graphic structure, or it can be a chip that is added with a driving signal function for the graphic structure on the basis of the original display panel driving chip. The pins of the driving chip can be connected to the driving signal end of the graphic structure of the two-dimensional material layer through the wire connected to the substrate and the via located between the substrate and the two-dimensional material layer. The third branch of the graphic structure extends along the first direction to the first branch of the adjacent graphic structure, and the driving signal is transmitted between the sub-pixels of the same color in each row or column through the above structure. The sub-pixels of the same color in each row or column can be connected through vias, and fewer vias can be set by electrically connecting some or all of the rows or columns of sub-pixels of the same color in the two-dimensional material layer, wherein some or all of the rows or columns of sub-pixels of the same color in the two-dimensional material layer can be electrically connected through two-dimensional materials, simplifying the production process of the two-dimensional material layer and reducing costs. The driving chip can provide driving signals for the graphic structures of three colors through three pins respectively, reducing the circuit area occupied by the substrate.

[0049] Optionally, the driving signal is a DC voltage signal, and the DC voltage signal ranges from 1V to 10V.

[0050] The voltage range of the DC voltage signal may be determined according to actual needs.

[0051] An embodiment of the present invention further provides a display device, comprising any display panel provided by the above embodiments.

[0052] Since the embodiments of the present invention adopt any of the above display panels, they have the beneficial effects of the corresponding display panels.

[0053] Fig.10 A flowchart of a method for manufacturing a display panel provided by an embodiment of the present invention, referring to Fig.10 The method for manufacturing a display panel provided by an embodiment of the present invention includes:

[0054] S1: Make a light-emitting element on one side of the base substrate.

[0055] S2: forming a color resist layer and a two-dimensional material layer on the side of the light emitting element away from the substrate.

[0056] When forming a two-dimensional material layer, a SiOx inorganic layer is first deposited by physical vapor deposition. The thickness of the SiOx inorganic layer can be 1000A. Then, a multilayer graphene structure is grown on the SiOx inorganic layer by low-pressure chemical vapor deposition combined with plasma-assisted growth. The process parameters of the preparation process are:

[0057] First, the pressure was 0.2 KPa, 85°C was maintained for 1 hour, and the atmosphere was hydrogen 20 sccm.

[0058] Then, the pressure was 0.2 KPa and the temperature was maintained at 100°C for 30 minutes. The plasma machine was turned on and the gas environment contained 20 sccm of hydrogen, an appropriate amount of ethanol gas (to control the film quality), and sulfur vapor (for doping).

[0059] Then, the temperature was rapidly lowered to room temperature while maintaining low pressure.

[0060] Finally, the designed graphic structure is transferred to graphene using exposure, etching and other techniques.

[0061] By choosing ethanol, which is easier to decompose, graphene can be prepared at a low temperature of about 80°C, avoiding the high temperature environment of the traditional graphene preparation process that affects the life of the OLED device, which is more feasible.

[0062] Optionally, the two-dimensional material layer is located between the color resist layer and the light-emitting element, or the two-dimensional material layer is located on a side of the color resist layer away from the light-emitting element.

[0063] Among them, if the two-dimensional material layer is located between the color resist layer and the light-emitting element, the color resist layer can be directly formed after the two-dimensional material layer is formed; if the two-dimensional material layer is located on the side of the color resist layer away from the light-emitting element, after the color resist layer is formed, a SiOx inorganic layer can be formed on the color resist layer, and then the two-dimensional material layer can be formed on the SiOx inorganic layer.

[0064] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: substrate substrate; A plurality of light emitting elements located on one side of the base substrate; A color resist layer located at the light-emitting side of the light-emitting element, the color resist layer comprising a color resist corresponding to the light-emitting element, the color resist transmitting the light emitted by the corresponding light-emitting element; A two-dimensional material layer located on the light-emitting side of the light-emitting element, the two-dimensional material layer comprising a plurality of graphic structures, one end of the graphic structure being connected to a driving signal end, the driving signal end being a driving signal loaded by the graphic structure, so that the width of the transmission spectrum of the graphic structure is smaller than the width of the transmission spectrum of the color resist; The two-dimensional material layer is located between the color resist layer and the light-emitting element, or the two-dimensional material layer is located on a side of the color resist layer away from the light-emitting element.

2. The display panel according to claim 1, characterized in that: The graphic structure includes a first annular structure and a second annular structure symmetrically arranged with respect to a first direction and a second direction, wherein the first annular structure and the second annular structure include a common portion extending along the first direction; The first annular structure includes a first opening, the second annular structure includes a second opening, the first opening and the second opening are symmetrically arranged about the common portion, and the direction in which the first opening points to the second opening is parallel to the second direction; The first direction is perpendicular to the second direction.

3. The display panel according to claim 2, characterized in that: The first annular structure includes a first branch portion extending along a first direction and a second branch portion extending along a second direction, and the common portion, the first branch portion and the second branch portion are connected to form the first annular structure; The second annular structure includes a third branch portion extending along the first direction and a fourth branch portion extending along the second direction, and the common portion, the third branch portion and the fourth branch portion are connected to form the second annular structure.

4. The display panel according to claim 3, characterized in that: A plurality of identical graphic structures are arranged along the second direction; The third branch portion in one of the graphic structures extends along the first direction to the first branch portion of the adjacent graphic structure.

5. The display panel according to claim 1, characterized in that: The graphic structure includes a first graphic structure, a second graphic structure and a third graphic structure; The color resist layer includes red color resist, green color resist and blue color resist, the first graphic structure corresponds to the red color resist, the second graphic structure corresponds to the green color resist, and the third graphic structure corresponds to the blue color resist.

6. The display panel according to claim 5, characterized in that: The projection area of ​​the first graphic structure on the base substrate is a1, the projection area of ​​the second graphic structure on the base substrate is a2, and the projection area of ​​the third graphic structure on the base substrate is a3, where a2>a3>a1.

7. The display panel according to claim 1, characterized in that: The graphic structure includes a fourth graphic structure and a fifth graphic structure; The color resist layer includes red color resist, green color resist and blue color resist, the fourth graphic structure corresponds to the green color resist, and the fifth graphic structure corresponds to the blue color resist; The projection area of ​​the fourth graphic structure on the base substrate is a4, the projection area of ​​the fifth graphic structure on the base substrate is a5, and a4>a5.

8. The display panel according to claim 1, characterized in that: The two-dimensional material layer is formed of a single two-dimensional material or a heterojunction of two-dimensional materials.

9. The display panel according to claim 8, characterized in that: The two-dimensional material includes graphene, molybdenum sulfide, tungsten sulfide or tungsten selenide.

10. The display panel according to claim 1, characterized in that: It also includes a driving chip, which is connected to the driving signal end and is used to provide the driving signal to the driving signal end.

11. The display panel according to claim 10, characterized in that: The driving signal is a DC voltage signal, and the range of the DC voltage signal is 1V~10V.

12. A display device, characterized in that: A display panel comprising any one of claims 1 to 11.

13. A method for preparing a display panel, characterized in that: include: Making a light emitting element on one side of the substrate; A color resist layer and a two-dimensional material layer are formed on the side of the light emitting element away from the base substrate.

14. The method for preparing a display panel according to claim 13, characterized in that: The two-dimensional material layer is located between the color resist layer and the light-emitting element, or the two-dimensional material layer is located on a side of the color resist layer away from the light-emitting element.

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