Display apparatus and manufacturing method thereof

1. A display apparatus comprising:

a plurality of unit modules; and

a cover configured to support the plurality of unit modules,

wherein each of the plurality of unit modules comprises:

a substrate;

a plurality of inorganic light emitting diodes provided on a mounting surface of the substrate; and

an encapsulation layer formed on the mounting surface of the substrate to cover the plurality of inorganic light emitting diodes and the mounting surface of the substrate,

wherein the encapsulation layer comprises a viscoelastic material having varying viscoelasticity based on temperature being applied to the viscoelastic material, and

wherein a seam between the plurality of unit modules adjacent to each other is visually hidden by applying heat to the encapsulation layer of the plurality of unit modules.

2. The display apparatus of claim 1 , wherein based on the viscoelastic material being heated and reaching a predetermined temperature, the viscoelasticity of the viscoelastic material is lowered and the viscoelastic material gains fluidity.

3. The display apparatus of claim 1 , wherein the viscoelastic material comprises at least one of ethylene based polymers, acetate based polymers, ethylene vinyl acetate based polymers, olefin based polymers or acrylic based polymers.

4. The display apparatus of claim 1 , wherein the substrate comprises:

a glass substrate; and

a thin film transistor (TFT) layer formed on the glass substrate and configured to drive the plurality of inorganic light emitting diodes.

5. The display apparatus of claim 1 , wherein the plurality of unit modules are arranged in a matrix.

6. The display apparatus of claim 1 , further comprising a compensation layer formed on the encapsulation layer to improve flatness of the encapsulation layer.

7. The display apparatus of claim 1 , further comprising a frame arranged between the plurality of unit modules and the cover and coupled to the plurality of unit modules.

8. The display apparatus of claim 1 , wherein the viscoelastic material is formed in a film or a sheet and the film or the sheet is laminated onto the substrate.

9. The display apparatus of claim 8 , wherein the viscoelastic material is laminated onto the substrate while heat and pressure are applied in a vacuum state.

10. A display apparatus comprising:

a plurality of unit modules; and

a cover configured to support the plurality of unit modules,

wherein each of the plurality of unit modules comprises:

a substrate;

at least one inorganic light emitting diode package mounted on a mounting surface of the substrate, the at least one inorganic light emitting diode package comprising:

an inorganic light emitting diode; and

a molding resin configured to individually surround the inorganic light emitting diode; and

an encapsulation layer formed on the mounting surface of the substrate to cover the at least one inorganic light emitting diode package and the mounting surface of the substrate,

wherein the encapsulation layer comprises a viscoelastic material having varying viscoelasticity based on temperature being applied to the viscoelastic material, and

wherein a seam between the plurality of unit modules adjacent to each other is visually hidden by applying heat to the encapsulation layer of the plurality of unit modules.

11. A display apparatus comprising:

a first unit module comprising:

a first substrate;

a plurality of first inorganic light emitting diodes provided on a first mounting surface of the first substrate; and

a first encapsulation layer formed on the first mounting surface of the first substrate to cover the plurality of first inorganic light emitting diodes and the first mounting surface of the first substrate;

a second unit module, the first unit module and the second unit module being adjacent to each other and having a gap therebetween, the second unit module comprising:

a second substrate;

a plurality of second inorganic light emitting diodes provided on a second mounting surface of the second substrate; and

a second encapsulation layer formed on the second mounting surface of the second substrate to cover the plurality of second inorganic light emitting diodes and the second mounting surface of the second substrate; and

a cover configured to support the first and second unit modules,

wherein a seam between the first unit module and the second unit module is visually hidden by varying viscoelasticity of each of the first and second encapsulation layers.

12. The display apparatus of claim 11 , wherein based on a viscoelastic material of each of the first and second encapsulation layers being heated and reaching a predetermined temperature, the viscoelasticity of each of the first and second encapsulation layers is lowered and the viscoelastic material of each of the first and second encapsulation layers gains fluidity.

13. The display apparatus of claim 12 , wherein the viscoelastic material of each of the first and second encapsulation layers comprises at least one of ethylene based polymers, acetate based polymers, ethylene vinyl acetate based polymers, olefin based polymers or acrylic based polymers.

14. The display apparatus of claim 11 , further comprising a compensation layer formed on the first and second encapsulation layers to improve flatness of the first and second encapsulation layers.

15. A method of manufacturing a display apparatus comprising:

mounting a plurality of inorganic light emitting diodes on a mounting surface of a substrate;

forming an encapsulation layer comprising a viscoelastic material on the mounting surface of the substrate to cover the plurality of inorganic light emitting diodes and the mounting surface of the substrate;

assembling a plurality of unit modules including a first unit module and a second unit module to be adjacent to each other, each of the plurality of unit modules comprising the substrate, the plurality of inorganic light emitting diodes, and the encapsulation layer; and

changing viscoelasticity of a first encapsulation layer of the first unit module and a second encapsulation layer of the second unit module to visually hide a seam between the first unit module and the second unit module.

16. The method of claim 15 , wherein based on the viscoelastic material being heated and reaching a predetermined temperature, the viscoelasticity of the viscoelastic material is lowered and the viscoelastic material gains fluidity.