A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, 18 emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light.

A polymer dispersed liquid crystal (PDLC) display device, comprising a PDLC display panel and a backlight module arranged below the PDLC display panel; wherein the PDLC display panel comprises a PDLC substrate, an array substrate arranged below the PDLC substrate, and a quantum dot (Q D) substrate arranged below the array substrate; the PDLC substrate comprises a first base plate, a black matrix arranged on the first base plate, a common electrode arranged on the black matrix and the first base plate, a PDLC and graphene mixture; the black matrix and the first base plate collectively delimit a plurality of pixel cavities, and the plurality of pixel cavities is filled with the PDLC and graphene mixture; the array substrate comprises a second base plate, a thin-film transistor (TFT) layer arranged on the second base plate, and a pixel electrode layer arranged on the TFT layer; and the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; the Q D substrate comprises a third base plate, a plurality of pixel patterns arranged on the third base plate and respectively corresponding to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red Q Ds and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon; and 20 the backlight module emits blue light; and the red pixel patterns and the green pixel pattern are excitable by blue light to emit red light and green light respectively and the transparent pixel patterns allows blue light to transmit therethrough to thereby display a blue color.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; 21 (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light; wherein in step (1), the PDLC and the graphene nanoparticles are mixed through mechanical stirring; wherein in step (1), the graphene nanoparticles are formed through one of mechanical exfoliation, oxidation-reduction operation, silicon carbide epitaxial growth, and chemical vapor deposition; and the graphene nanoparticles have a particle size in the range of Onm⁻⁸ 0 nm; and wherein in step (1), the graphene nanoparticles and the PDLC are mixed at a mass ratio of 0.1-5:100.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, 18 emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light.

A polymer dispersed liquid crystal (PDLC) display device, comprising a PDLC display panel and a backlight module arranged below the PDLC display panel; wherein the PDLC display panel comprises a PDLC substrate, an array substrate arranged below the PDLC substrate, and a quantum dot (Q D) substrate arranged below the array substrate; the PDLC substrate comprises a first base plate, a black matrix arranged on the first base plate, a common electrode arranged on the black matrix and the first base plate, a PDLC and graphene mixture; the black matrix and the first base plate collectively delimit a plurality of pixel cavities, and the plurality of pixel cavities is filled with the PDLC and graphene mixture; the array substrate comprises a second base plate, a thin-film transistor (TFT) layer arranged on the second base plate, and a pixel electrode layer arranged on the TFT layer; and the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; the Q D substrate comprises a third base plate, a plurality of pixel patterns arranged on the third base plate and respectively corresponding to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red Q Ds and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon; and 20 the backlight module emits blue light; and the red pixel patterns and the green pixel pattern are excitable by blue light to emit red light and green light respectively and the transparent pixel patterns allows blue light to transmit therethrough to thereby display a blue color.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; 21 (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light; wherein in step (1), the PDLC and the graphene nanoparticles are mixed through mechanical stirring; wherein in step (1), the graphene nanoparticles are formed through one of mechanical exfoliation, oxidation-reduction operation, silicon carbide epitaxial growth, and chemical vapor deposition; and the graphene nanoparticles have a particle size in the range of Onm⁻⁸ 0 nm; and wherein in step (1), the graphene nanoparticles and the PDLC are mixed at a mass ratio of 0.1-5:100.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, 18 emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light.

A polymer dispersed liquid crystal (PDLC) display device, comprising a PDLC display panel and a backlight module arranged below the PDLC display panel; wherein the PDLC display panel comprises a PDLC substrate, an array substrate arranged below the PDLC substrate, and a quantum dot (Q D) substrate arranged below the array substrate; the PDLC substrate comprises a first base plate, a black matrix arranged on the first base plate, a common electrode arranged on the black matrix and the first base plate, a PDLC and graphene mixture; the black matrix and the first base plate collectively delimit a plurality of pixel cavities, and the plurality of pixel cavities is filled with the PDLC and graphene mixture; the array substrate comprises a second base plate, a thin-film transistor (TFT) layer arranged on the second base plate, and a pixel electrode layer arranged on the TFT layer; and the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; the Q D substrate comprises a third base plate, a plurality of pixel patterns arranged on the third base plate and respectively corresponding to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red Q Ds and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon; and 20 the backlight module emits blue light; and the red pixel patterns and the green pixel pattern are excitable by blue light to emit red light and green light respectively and the transparent pixel patterns allows blue light to transmit therethrough to thereby display a blue color.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; 21 (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light; wherein in step (1), the PDLC and the graphene nanoparticles are mixed through mechanical stirring; wherein in step (1), the graphene nanoparticles are formed through one of mechanical exfoliation, oxidation-reduction operation, silicon carbide epitaxial growth, and chemical vapor deposition; and the graphene nanoparticles have a particle size in the range of Onm⁻⁸ 0 nm; and wherein in step (1), the graphene nanoparticles and the PDLC are mixed at a mass ratio of 0.1-5:100.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, 18 emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light.

A polymer dispersed liquid crystal (PDLC) display device, comprising a PDLC display panel and a backlight module arranged below the PDLC display panel; wherein the PDLC display panel comprises a PDLC substrate, an array substrate arranged below the PDLC substrate, and a quantum dot (Q D) substrate arranged below the array substrate; the PDLC substrate comprises a first base plate, a black matrix arranged on the first base plate, a common electrode arranged on the black matrix and the first base plate, a PDLC and graphene mixture; the black matrix and the first base plate collectively delimit a plurality of pixel cavities, and the plurality of pixel cavities is filled with the PDLC and graphene mixture; the array substrate comprises a second base plate, a thin-film transistor (TFT) layer arranged on the second base plate, and a pixel electrode layer arranged on the TFT layer; and the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; the Q D substrate comprises a third base plate, a plurality of pixel patterns arranged on the third base plate and respectively corresponding to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red Q Ds and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon; and 20 the backlight module emits blue light; and the red pixel patterns and the green pixel pattern are excitable by blue light to emit red light and green light respectively and the transparent pixel patterns allows blue light to transmit therethrough to thereby display a blue color.

A method for manufacturing a polymer dispersed liquid crystal (PDLC) display device, comprising the following steps: (1) providing PDLC and graphene nanoparticles and mixing the graphene nanoparticles and the PDLC at a mass ratio of 0.1-20:100, followed by uniform stirring to obtain a PDLC and graphene mixture; (2) providing a first base plate, coating a black matrix material on the first base plate, and subjecting the black matrix material to a patterning operation to form a black matrix, wherein the first base plate and the black matrix collectively delimit a plurality of pixel cavities; (3) forming a common electrode on and completely covering the black matrix, the plurality of pixel cavities, and the first base plate; and dropping the PDLC and graphene mixture into the plurality of pixel cavities at predetermined sites to form a PDLC substrate; (4) providing a second base plate and forming, in sequence, a thin-film transistor (TFT) layer and a pixel electrode on the second base plate to form an array substrate, wherein the pixel electrode layer comprises a plurality of pixel electrodes respectively corresponding to the plurality of pixel cavities; (5) coating first enclosure resin along a circumference of the PDLC substrate or the array substrate and conducting vacuum lamination of the PDLC substrate and the array substrate; 21 (6) providing a third base plate and forming a plurality of pixel patterns on the base plate to respectively correspond to the plurality of pixel cavities, wherein the plurality of pixel patterns comprises red pixel patterns, green pixel patterns, and transparent pixel patterns; the red pixel patterns is formed of a material comprising a mixture of red quantum dots (Q Ds) and a transparent photoresist material; the green pixel patterns is formed of a material comprising a mixture of green Q Ds and a transparent photoresist material; and the transparent pixel patterns includes no material provided thereon, so as to form a Q D substrate, wherein the red pixel patterns and the green pixel patterns, when excited by blue light, emit red light and green light respectively and the transparent pixel patterns allow blue light to transmit therethrough to display a blue color; (7) coating second enclosure resin along a circumference of the array substrate or the Q D substrate and conducting lamination of the array substrate and the Q D substrate such that the PDLC substrate, the array substrate, and the Q D substrate collectively form a PDLC display panel; and (8) providing a backlight module and combining the PDLC display panel and the backlight module together to form a PDLC display device, wherein the backlight module emits blue light; wherein in step (1), the PDLC and the graphene nanoparticles are mixed through mechanical stirring; wherein in step (1), the graphene nanoparticles are formed through one of mechanical exfoliation, oxidation-reduction operation, silicon carbide epitaxial growth, and chemical vapor deposition; and the graphene nanoparticles have a particle size in the range of Onm⁻⁸ 0 nm; and wherein in step (1), the graphene nanoparticles and the PDLC are mixed at a mass ratio of 0.1-5:100.