Display module and tiling display device having an antireflection layer

1 . A display module comprising:

a display panel;

an optical layer disposed on the display panel; and

an antireflection layer disposed on the optical layer,

wherein the antireflection layer includes:

a first layer in contact with an upper surface of the optical layer and including silicon oxynitride;

a second layer in contact with an upper surface of on the first layer and including silicon nitride; and

a third layer in contact with an upper surface of the second layer and including polysilazane,

wherein an upper surface of the third layer defines an outermost surface of the antireflection layer,

wherein the first layer including silicon oxynitride, the second layer including silicon nitride, and the third layer including polysilazane collectively block reflection of external light through destructive interference,

wherein a reflectance on an upper surface of the antireflection layer is about 2% or less,

wherein a surface hardness of the upper surface of the antireflection layer is about 3H or greater, and

wherein a tolerance between a side surface of the antireflection layer and a side surface of the display panel is about 30 μm or less.

2 . The display module of claim 1 ,

wherein a refractive index of the first layer is about 1.60 or greater and about 1.69 or less,

wherein a refractive index of the second layer is about 1.70 or greater and about 1.90 or less, and

wherein a refractive index of the third layer is about 1.35 or greater and about 1.45 or less.

3 . The display module of claim 1 , wherein a thickness of each of the first to third layers is about 50 nm or greater and about 150 nm or less.

4 . The display module of claim 1 , wherein the polysilazane includes at least one repeating unit selected from a first repeating unit and a second repeating unit,

wherein the first repeating unit is a unit of the following formula:

wherein the second repeating unit is a unit of the following formula:

wherein

each of R 1 and R 2 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted carbonyl group, a substituted or unsubstituted alkyl group having 1 or about to 30 or less carbon atoms, a substituted or unsubstituted alkenyl group having 2 or about and 30 or less carbon atoms, a substituted or unsubstituted aryl group having 6 or about and 30 or less ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 or about and 30 or less ring carbon atoms.

5 . The display module of claim 1 , wherein the polysilazane is represented by one of

wherein

each of R 1 and R 2 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted carbonyl group, a substituted or unsubstituted alkyl group having 1 or greater to 30 or less carbon atoms, a substituted or unsubstituted alkenyl group having 2 or greater and 30 or less carbon atoms, a substituted or unsubstituted aryl group having 6 or greater and 30 or less ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 or greater and 30 or less ring carbon atoms, and

each of n 1 , n 2 , and n 3 is independently an integer of 10 or greater and 10,000 or less.

6 . The display module of claim 1 , further comprising:

a light control layer disposed between the display panel and the optical layer.

7 . The display module of claim 6 ,

wherein the display panel includes a plurality of light-emitting elements which generates a light, and

wherein the light control layer includes:

a first light control unit which transmits the light as a first light;

a second light control unit which converts the light into a second light having a wavelength different from a wavelength of the first light; and

a third light control unit which converts the light into a third light having a wavelength different from the wavelength of each of the first light and the second light.

8 . The display module of claim 1 , wherein the optical layer includes:

a color filter layer disposed on the display panel; and

an overcoat layer disposed on the color filter layer, and

wherein the antireflection layer is in contact with an upper surface of the overcoat layer.

9 . The display module of claim 8 ,

wherein a refractive index of the overcoat layer is about 1.45 or greater and about 1.53 or less, and

wherein a thickness of the overcoat layer is about 3 μm or greater and about 10 μm or less.

10 . A display module comprising:

a display panel;

an optical layer disposed on the display panel; and

an antireflection layer disposed on the optical layer,

wherein the optical layer includes:

a color filter layer including a plurality of color filter units; and

an overcoat layer disposed on the color filter layer, and

wherein the antireflection layer includes:

a first layer in contact with an upper surface of the overcoat layer and including silicon oxynitride;

a second layer in contact with an upper surface of the first layer including silicon nitride; and

a third layer in contact with an upper surface of the second layer and including polysilazane,

wherein an upper surface of the third layer defines an outermost surface of the antireflection layer,

wherein the first layer including silicon oxynitride, the second layer including silicon nitride, and the third layer including polysilazane collectively block reflection of external light through destructive interference,

wherein a reflectance on an upper surface of the antireflection layer is about 2% or less,

wherein a surface hardness of the upper surface of the antireflection layer is about 3H or greater, and

wherein a tolerance between a side surface of the antireflection layer and a side surface of the display panel is about 30 μm or less.

11 . A tiling display device including a plurality of display modules arranged in at least one direction,

wherein each of the plurality of display modules includes:

a display panel;

an optical layer disposed on the display panel; and

an antireflection layer disposed on the optical layer,

wherein the antireflection layer includes:

a first layer in contact with an upper surface of the optical layer and including silicon oxynitride;

a second layer in contact with an upper surface of the first layer and including silicon nitride; and

a third layer in contact with an upper surface of the second layer and including polysilazane,

wherein an upper surface of the third layer defines an outermost surface of the antireflection layer,

wherein the first layer including silicon oxynitride, the second layer including silicon nitride, and the third layer including polysilazane collectively block reflection of external light through destructive interference,

wherein a reflectance on an upper surface of the antireflection layer is about 2% or less,

wherein a surface hardness of the upper surface of the antireflection layer is about 3H or greater, and

wherein a tolerance between a side surface of the antireflection layer and a side surface of the display panel is about 30 μm or less.

12 . The tiling display device of claim 11 , wherein a tolerance between a side surface of the antireflection layer and a side surface of the display panel is 30 μm or less.

13 . The tiling display device of claim 11 ,

wherein a refractive index of the first layer is about 1.60 or greater and about 1.69 or less,

Wherein a refractive index of the second layer is about 1.70 or greater and about 1.90 or less, and

wherein a refractive index of the third layer is about 1.35 or greater and about 1.45 or less.