Display apparatus and light source device thereof

1. A display apparatus comprising:

a printed circuit board (PCB);

a light emitting diode (LED) chip mounted on the PCB and configured to emit light;

an optical dome disposed over and enclosing the LED chip;

a distributed Bragg reflector (DBR) layer arranged on an upper surface of the LED chip;

a liquid crystal panel configured to block or pass light output from the LED chip; and

an optical film arranged between the LED chip and the liquid crystal panel,

wherein a ratio of a height of the optical dome to a diameter of a bottom surface of the optical dome is 0.25 to 0.31, and

wherein the optical film comprises a quantum dot sheet formed to enhance color reproducibility by making a change in wavelength of light.

2. The display apparatus of claim 1 , wherein the LED chip is provided to emit blue light.

3. The display apparatus of claim 2 , wherein the LED chip comprises a horizontal side and a vertical side, and

wherein the vertical side is 500 m or less in length and the horizontal side is 500 m or less in length.

4. The display apparatus of claim 1 , wherein the LED chip is mounted on a mounting surface of the PCB in a chip on board (COB) method.

5. The display apparatus of claim 1 , wherein a ratio of a distance between a center of the bottom surface of the optical dome and a center of the LED chip to the diameter of the bottom surface of the optical dome is greater than 0 but less than or equal to 0.2.

6. The display apparatus of claim 1 , wherein the LED chip comprises an n-type semiconductor layer, a p-type semiconductor layer, and a light-emitting layer arranged between the n-type semiconductor layer and the p-type semiconductor layer configured to emit light.

7. The display apparatus of claim 6 , wherein the LED chip further comprises:

a growth substrate arranged to cover an upper surface of the n-type semiconductor layer or the p-type semiconductor layer.

8. The display apparatus of claim 7 , wherein the distributed Bragg reflector (DBR) layer arranged on an upper surface of the growth substrate.

9. The display apparatus of claim 7 , wherein the LED chip further comprises:

a metal reflector layer arranged on a lower surface of the light-emitting layer.

10. The display apparatus of claim 9 , wherein the metal reflector layer comprises aluminum (Al) or a distributed Bragg reflector (DBR).

11. The display apparatus of claim 7 , wherein the growth substrate comprises a sapphire substrate.

12. The display apparatus of claim 1 , further comprising a reflecting sheet attached to the PCB, the reflecting sheet comprising a through hole provided for the optical dome to protrude through.

13. The display apparatus of claim 1 , wherein the optical dome comprises silicon or epoxy resin.

14. The display apparatus of claim 1 , wherein the optical film comprises a diffuser plate configured to diffuse light emitted from the LED chip.