Liquid crystal display panel and method of manufacturing the same

1. A liquid crystal display panel, comprising a pixel area, and further comprising:

a reflective layer;

a glass substrate serving as a light guide plate, disposed on the reflective layer;

a grating structure disposed on the light guide plate and corresponding to the pixel area;

a planarization layer disposed on the grating structure; and

a thin-film transistor layer disposed on the planarization layer

wherein the pixel area comprises a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the grating structure comprises a plurality of sub-gratings corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel one by one; and

film thicknesses and refractive indexes of the sub-gratings respectively corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel are different.

2. The liquid crystal display panel according to claim 1 , wherein the pixel area comprises a plurality of pixel units, each of the pixel units has a plurality of sub-pixels; the grating structure has a plurality of grating units, each of the grating units has a sub-grating and corresponds to one of the pixel units; and in the pixel units and the grating units corresponding to the pixel units, each of the sub-gratings corresponds to one of the sub-pixels.

3. The liquid crystal display panel according to claim 2 , wherein the sub-pixels comprise the red sub-pixel, the green sub-pixel, and the blue sub-pixel, and the sub-grating in each of the sub-pixels comprises a plurality of layers with a same thickness; and

wherein emission wavelengths of the sub-gratings in the red sub-pixel area, the green sub-pixel area, and the blue sub-pixel area are controlled according to the Bragg equation: 2d sin θ=nλ, where d is a thickness of the layers of each of the sub-gratings, θ is an incident angle of incident light, n is a refractive index of the layers of each of the sub-gratings, λ is an emission wavelength, and the emission light wavelength of each of the sub-gratings is controlled by adjusting the thickness of the layers of each of the sub-gratings, the incident angle of the incident light, and the refractive index of the layers of each of the sub-gratings.

4. The liquid crystal display panel according to claim 3 , wherein each of the sub-gratings in the red sub-pixel area emits light with a wavelength of 580 nm-660 nm, each of the sub-gratings in the green sub-pixel area emits light with a wavelength of 500 nm-580 nm, and each of the sub-gratings in the blue sub-pixel area emits light with a wavelength of 440 nm-500 nm.

5. The liquid crystal display panel according to claim 1 , further comprising a light source disposed facing toward a sidewall of the glass substrate.

6. The liquid crystal display panel according to claim 1 , wherein the liquid crystal display panel further comprise a plurality of light-shielding layers disposed on a same layer as the grating structure, and each of the light-shielding layers is disposed between adjacent two of the sub-gratings.

7. The liquid crystal display panel according to claim 6 , wherein the planarization layer is disposed on and cover the grating structure and the light-shielding layers.

8. The liquid crystal display panel according to claim 1 , wherein a width of a sub-grating is equal to a width of a corresponding sub-pixel.

9. A method of manufacturing a liquid crystal display panel, wherein the liquid crystal display panel comprises a pixel area, and the method of manufacturing the liquid crystal display panel comprises the following steps:

providing a glass substrate configured to serve a light guide plate;

preparing a reflective layer on a side of the light guide plate;

preparing a grating structure on a side of the light guide plate away from the reflective layer, wherein a position of the grating structure corresponds to the pixel area, the pixel area comprises a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the grating structure comprises a plurality of sub-gratings corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel one by one;

preparing a planarization layer on a side of the grating structure away from the light guide plate; and

preparing a thin-film transistor layer on a side of the planarization layer away from the light guide plate;

wherein film thicknesses and refractive indexes of the sub-gratings respectively corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel are different.

10. The method of manufacturing the liquid crystal display panel according to claim 9 , wherein the grating structure is made of silicon oxide, the silicon oxide is doped with a photosensitive material, and the grating structure is prepared by chemical vapor deposition.

11. The method of manufacturing the liquid crystal display panel according to claim 9 , wherein the pixel area comprises a plurality of pixel units, each of the pixel units has a plurality of sub-pixels; the grating structure has a plurality of grating units, each of the grating units has a sub-grating and corresponds to one of the pixel units; and in the pixel units and the grating units corresponding to the pixel units, each of the sub-gratings corresponds to one of the sub-pixels; and

wherein the sub-pixels comprise the red sub-pixel, the green sub-pixel, and the blue sub-pixel, and the sub-grating in each of the sub-pixels comprises a plurality of layers with a same thickness; and

wherein emission wavelengths of the sub-gratings in the red sub-pixel area, the green sub-pixel area, and the blue sub-pixel area are controlled according to the Bragg equation: 2d sin θ=nλ, where d is a thickness of the layers of each of the sub-gratings, θ is an incident angle of incident light, n is a refractive index of the layers of each of the sub-gratings, λ is an emission wavelength, and the emission light wavelength of each of the sub-gratings is controlled by adjusting the thickness of the layers of each of the sub-gratings, the incident angle of the incident light, and the refractive index of the layers of each of the sub-gratings.

12. The method of manufacturing the liquid crystal display panel according to claim 11 , wherein each of the sub-gratings in the red sub-pixel area emits light with a wavelength of 580 nm-660 nm, each of the sub-gratings in the green sub-pixel area emits light with a wavelength of 500 nm-580 nm, and each of the sub-gratings in the blue sub-pixel area emits light with a wavelength of 440 nm-500 nm.

13. The method of manufacturing the liquid crystal display panel according to claim 11 , wherein, between preparing the grating structure and preparing the planarization layer, the method of manufacturing the liquid crystal display panel further comprises:

preparing a plurality of light-shielding layers on a same layer as the grating structure, each of the light-shielding layers being formed between adjacent two of the sub-gratings, and the light-shielding layers being made of an opaque material or a light-reflecting material.

14. The liquid crystal display panel according to claim 13 , wherein the planarization layer is disposed on and cover the grating structure and the light-shielding layers.

15. The liquid crystal display panel according to claim 9 , wherein a width of a sub-grating is equal to a width of a corresponding sub pixel.