Display substrate and preparation method therefor, and display apparatus

1 . A display substrate, comprising a light-emitting unit layer arranged on a base and a reflective layer arranged on the light-emitting unit layer, wherein

the light-emitting unit layer comprises a plurality of light emitting units corresponding to different colors, and the reflective layer is provided with light transmission holes corresponding to the plurality of light-emitting units on a one-to-one basis; and

a light modulation layer is arranged on a side of the reflective layer away from the base, and the light modulation layer is configured to reflect part of light rays in a blue light waveband and transmit light rays in wavebands other than the blue light waveband,

wherein the display substrate further comprises an optical adhesive layer and a capping layer, the capping layer is arranged on a side of the reflective layer away from the base, the light modulation layer is arranged on a surface of a side of the capping layer away from the base, and the optical adhesive layer is arranged between the reflective layer and the capping layer, wherein a thickness of the optical adhesive layer is 50 μm and a thickness of the capping layer is 500 μm.

2 . The display substrate according to claim 1 , wherein the reflective layer comprises a metal-oxide composite structure or a metal-compound composite structure, which forms a colored mirror display.

3 . The display substrate according to claim 2 , wherein in the metal-oxide composite structure or the metal-compound composite structure, the metal comprises any one or more of molybdenum, aluminum and titanium, the oxide comprises any one or more of a molybdenum oxide, a copper oxide and a niobium oxide, and the compound comprises a metal matrix composite material.

4 . The display substrate according to claim 3 , wherein

the light modulation layer comprises a plurality of sub-layers that are stacked,

the plurality of sub-layers comprise a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, and

the first refractive index layer and the second refractive index layer in the plurality of sub-layers are alternately arranged, the first refractive index being greater than the second refractive index.

5 . The display substrate according to claim 2 , wherein

the light modulation layer comprises a plurality of sub-layers that are stacked,

the plurality of sub-layers comprise a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, and

the first refractive index layer and the second refractive index layer in the plurality of sub-layers are alternately arranged, the first refractive index being greater than the second refractive index.

6 . The display substrate according to claim 1 , wherein

the light modulation layer comprises a plurality of sub-layers that are stacked,

the plurality of sub-layers comprise a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, and

the first refractive index layer and the second refractive index layer in the plurality of sub-layers are alternately arranged, the first refractive index being greater than the second refractive index.

7 . The display substrate according to claim 6 , wherein the light modulation layer comprises a first sub-layer, a second sub-layer, and a third sub-layer that are stacked; or the light modulation layer comprises a first sub-layer, a second sub-layer, a third sub-layer, a fourth sub-layer and a fifth sub-layer that are stacked; and

the first sub-layer, the third sub-layer and the fifth sub-layer are first refractive index layers having a first refractive index, and the second sub-layer and the fourth sub-layer are second refractive index layers having a second refractive index.

8 . The display substrate according to claim 7 , wherein

the thickness of the first sub-layer is 20 nm to 80 nm, the thickness of the second sub-layer is 80 nm to 120 nm, the thickness of the third sub-layer is 20 nm to 80 nm, the thickness of the fourth sub-layer is 80 nm to 120 nm, and the thickness of the fifth sub-layer is 20 nm to 80 nm; or

the thickness of the first sub-layer is 150 nm to 250 nm, the thickness of the second sub-layer is 30 nm to 90 nm, the thickness of the third sub-layer is 150 nm to 250 nm, the thickness of the fourth sub-layer is 30 nm to 90 nm, and the thickness of the fifth sub-layer is 150 nm to 250 nm.

9 . The display substrate according to claim 6 , wherein in a visible light range, the first refractive index is 1.6 to 2.5, and the second refractive index is 1.3 to 1.5.

10 . A display apparatus, comprising the display substrate according to claim 1 .

11 . A preparation method for a display substrate, comprising:

forming a light-emitting unit layer and a reflective layer arranged on the light-emitting unit layer sequentially on a base, the light-emitting unit layer comprising a plurality of light emitting units corresponding to different colors, and the reflective layer being provided with light transmission holes corresponding to the plurality of light-emitting units on a one-to-one basis; and

forming a light modulation layer, the light modulation layer being configured to reflect part of light rays in a blue light waveband and transmit light rays in other wavebands than the blue light waveband, coating an optical adhesive layer on the reflective layer, and attaching a capping layer formed with the light modulation layer to the optical adhesive layer by an attaching process, wherein the light modulation layer is arranged on a surface of a side of the capping layer away from the base, wherein a thickness of the optical adhesive layer is 50 μm and a thickness of the capping layer is 500 μm.

12 . The method according to claim 11 , wherein the forming a light modulation layer comprises:

forming a first sub-layer, a second sub-layer and a third sub-layer sequentially on a capping layer; or forming a first sub-layer, a second sub-layer, a third sub-layer, a fourth sub-layer and a fifth sub-layer sequentially on a capping layer;

the first sub-layer, the third sub-layer and the fifth sub-layer being first refractive index layers having a first refractive index, the second sub-layer and the fourth sub-layer being second refractive index layers having a second refractive index, the first refractive index being greater than the second refractive index.

13 . The method according to claim 12 , wherein

the material of the reflective layer comprises a metal-oxide composite structure or a metal-compound composite structure, which forms a colored mirror display, in the metal-oxide composite structure or the metal-compound composite structure, the metal comprises any one or more of molybdenum, aluminum and titanium, the oxide comprises any one or more of a molybdenum oxide, a copper oxide and a niobium oxide, and the compound comprises a metal matrix composite material;

the thickness of the first sub-layer is 20 nm to 80 nm, the thickness of the second sub-layer is 80 nm to 120 nm, the thickness of the third sub-layer is 20 nm to 80 nm, the thickness of the fourth sub-layer is 80 nm to 120 nm, and the thickness of the fifth sub-layer is 20 nm to 80 nm; or the thickness of the first sub-layer is 150 nm to 250 nm, the thickness of the second sub-layer is 30 nm to 90 nm, the thickness of the third sub-layer is 150 nm to 250 nm, the thickness of the fourth sub-layer is 30 nm to 90 nm, and the thickness of the fifth sub-layer is 150 nm to 250 nm.

14 . The method according to claim 11 , wherein

the material of the reflective layer comprises a metal-oxide composite structure or a metal-compound composite structure, which forms a colored mirror display, in the metal-oxide composite structure or the metal-compound composite structure, the metal comprises any one or more of molybdenum, aluminum and titanium, the oxide comprises any one or more of a molybdenum oxide, a copper oxide and a niobium oxide, and the compound comprises a metal matrix composite material;

the thickness of the first sub-layer is 20 nm to 80 nm, the thickness of the second sub-layer is 80 nm to 120 nm, the thickness of the third sub-layer is 20 nm to 80 nm, the thickness of the fourth sub-layer is 80 nm to 120 nm, and the thickness of the fifth sub-layer is 20 nm to 80 nm; or the thickness of the first sub-layer is 150 nm to 250 nm, the thickness of the second sub-layer is 30 nm to 90 nm, the thickness of the third sub-layer is 150 nm to 250 nm, the thickness of the fourth sub-layer is 30 nm to 90 nm, and the thickness of the fifth sub-layer is 150 nm to 250 nm.