What is claimed is:1. A display device comprising:a substrate including a first display area and a second display area;first pixels disposed on the substrate in the first display area;a functional module disposed below the substrate in the second display area; anda light block layer disposed on the functional module, the light block layer including patterns disposed in a matrix in the second display area, whereinthe second display area includes a transmission area as an area in the second display area not including the light block layer, andeach of the patterns include:a main part having a substantially rectangular shape with substantially rounded corners; andline parts substantially curved away from the main part.2. The display device of claim 1, wherein the line parts comprise:a first line part adjacent to a first side of the main part;a second line part adjacent to a second side opposite to the first side of the main part;a third line part adjacent to a third side disposed between the first side and the second side of the main part; anda fourth line part adjacent to a fourth side opposite to the third side of the main part.3. The display device of claim 2, wherein a first curvature radius of the first line part, a second curvature radius of the second line part, a third curvature radius of the third line part, and a fourth curvature radius of the fourth line part are equal to each other.4. The display device of claim 2, wherein each of a first curvature radius of the first line part, a second curvature radius of the second line part, a third curvature radius of the third line part, and a fourth curvature radius of the fourth line part is about 25 μm or more and about 30 μm or less.5. The display device of claim 2, wherein each of a width of the first line part, a width of the second line part, a width of the third line part, and a width of the fourth line part is about 15 μm or more and about 30 μm or less.6. The display device of claim 1, wherein each of the line parts comprises a protrusion on a side surface of the line parts.7. The display device of claim 1, further comprising:a second pixel disposed on the main part; anda wiring disposed on the line part, the wiring is electrically connected to the second pixel.8. The display device of claim 7, wherein the wiring includes at least one of a gate signal line, a data signal line, and a driving signal line.9. The display device of claim 7, whereinthe wiring includes conductive layers sequentially stacked on the line parts, andeach of the conductive layers is electrically insulated from each other.10. The display device of claim 1, wherein a curvature radius of the substantially rounded corners of the main part is about 15 μm or more and about 30 μm or less.11. A display device comprising:a substrate including a first display area and a second display area;first pixels disposed on the substrate in the first display area;a functional module disposed below the substrate in the second display area; anda light block layer disposed on the functional module, the light block layer including patterns disposed in a matrix in the second display area, whereinthe second display area includes a transmission area as an area in the second display area not including the light block layer, andeach of the patterns include a main part having a substantially rectangular shape and including:a substantially circular protrusion part at corners of the substantially rectangular shape; andline parts substantially curved away from the main part.12. The display device of claim 11, wherein the line parts comprise:a first line part adjacent to a first side of the main part;a second line part adjacent to a second side opposite to the first side of the main part;a third line part adjacent to a third side disposed between the first side and the second side of the main part; anda fourth line part adjacent to a fourth side opposite to the third side of the main part.13. The display device of claim 12, wherein a first curvature radius of the first line part, a second curvature radius of the second line part, a third curvature radius of the third line part, and a fourth curvature radius of the fourth line part are equal to each other.14. The display device of claim 12, wherein each of a first curvature radius of the first line part, a second curvature radius of the second line part, a third curvature radius of the third line part, and a fourth curvature radius of the fourth line part is about 25 μm or more and about 30 μm or less.15. The display device of claim 12, wherein each of a width of the first line part, a width of the second line part, a width of the third line part, and a width of the fourth line part is about 15 μm or more and about 30 μm or less.16. The display device of claim 11, wherein each of the line parts comprises a protrusion on a side surface of the line parts.17. The display device of claim 11, further comprising:a second pixel disposed on the main part; anda wiring disposed on the line part, and electrically connected to the second pixel.18. The display device of claim 17, wherein the wiring includes at least one of a gate signal line, a data signal line, and a driving signal line.19. The display device of claim 17, whereinthe wiring includes conductive layers sequentially stacked on the line part, andeach of the conductive layers is electrically insulated from each other.20. The display device of claim 11, wherein a curvature radius of the substantially circular protrusion part of the main part is about 15 μm or more and about 30 μm or less.