Circuit board including light-emitting elements and display apparatus including the circuit board
A circuit board for a display apparatus includes a substrate, a plurality of light-emitting elements arranged substantially in a line on the substrate, and a plurality of branch lines connecting the light-emitting elements to each other in series. A first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements.
1. A circuit board comprising:
a substrate;
a plurality of light-emitting elements arranged substantially in a line on the substrate; and
a plurality of branch lines connecting the light-emitting elements to each other in series,
wherein a first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements,
wherein at least one branch line from among each of the first and second groups of the plurality of branch lines connects two non-adjacent light-emitting elements from among the plurality of light-emitting elements.
2. The circuit board of claim 1 , wherein the light-emitting elements are light-emitting diodes.
3. The circuit board of claim 1 , wherein the substrate is formed as a single layer substrate.
4. The circuit board of claim 1 , wherein the plurality of light-emitting elements are divided into a first group and a second group, and each group comprises a plurality of successively neighboring light-emitting elements, wherein
the first group and the second group are adjacent to each other,
a first light-emitting element and a second light-emitting element in the first group are connected by a first branch line located on the first side of the line of the plurality of light-emitting elements, and
the first light-emitting element in the first group and a third light-emitting element in the second group are connected by a second branch line located on the second side of the line of the plurality of light-emitting elements.
5. A circuit board comprising:
a substrate;
a plurality of light-emitting elements arranged substantially in a line on the substrate; and
a plurality of branch lines connecting the light-emitting elements to each other in series,
wherein a first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements,
wherein a K-th light-emitting element in the plurality of light-emitting elements is connected in series to a (K+2N+1)-th light-emitting element by a first branch line, and a (K+L)-th light-emitting element is connected in series to a (K+2N+1−L)-th light-emitting element by a second branch line, wherein N is equal to a number of branch lines in the plurality of branch lines, and L is a number greater than or equal to 1 and less than or equal to N.
6. The circuit board of claim 5 , wherein the first branch line and the second branch line are located on a same side of the line of the plurality of light-emitting elements.
7. The circuit board of claim 5 , wherein the (K+2N+1)-th light-emitting element is connected in series to a (K+2N+2)-th light-emitting element by a third branch line, and the (K+2N+1−L)-th light-emitting element is connected in series to a (K+2N+2+L)-th light-emitting element by a fourth branch line.
8. The circuit board of claim 7 , wherein the fourth branch line is located on the first side of the line of the plurality of light-emitting elements, and the first branch line and the second branch line are located on the second side of the line of the plurality of light-emitting elements.
9. The circuit board of claim 1 , wherein a K-th light-emitting element in the plurality of light-emitting elements is connected in series to a (K+P)-th light-emitting element by a first branch line, and a (K+1)-th light-emitting element is connected in series to a (K+P+1)-th light-emitting element by a second branch line, wherein
P is a number greater than or equal to a number of branch lines in the plurality of branch lines,
the first branch line is located on the first side of the line of the plurality of light-emitting elements, and
the second branch line extends from the (K+1)-th light-emitting element towards the first side of the line of the plurality of light-emitting elements, passes between the (K+P)-th light-emitting element and a (K+P−1)-th light-emitting element, and is connected to the (K+P+1)-th light-emitting element on the second side of the line of the plurality of light-emitting elements.
10. The circuit board of claim 1 , wherein a power line for supplying power to the plurality of light-emitting elements is connected to an end of each of the plurality of branch lines.
11. The circuit board of claim 10 , wherein a feedback line for detecting a current value of each of the plurality of branch lines is connected to another end of each of the plurality of branch lines.
12. A display apparatus comprising:
a display panel; and
a backlight unit supplying light to the display panel, wherein the backlight unit comprises a plurality of light-emitting elements mounted on a substrate, and at least one of the light-emitting elements is connected to an internal wiring on the substrate,
wherein the plurality of light-emitting elements are arranged substantially in a line on the substrate and are connected in series by a plurality of branch lines, wherein a first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements,
wherein at least one branch line from among each of the first and second groups of the plurality of branch lines connects two non-adjacent light-emitting elements from among the plurality of light-emitting elements.
13. The display apparatus of claim 12 , wherein the light-emitting elements are light-emitting diodes.
14. The display apparatus of claim 12 , wherein the substrate is formed as a single layer substrate.
15. The display apparatus of claim 12 , wherein the plurality of light-emitting elements are divided into a first group and a second group, and each group comprises a plurality of successively neighboring light-emitting elements, wherein
the first group and the second group are adjacent to each other,
a first light-emitting element and a second light-emitting element in the first group are connected by a first branch line located on the first side of the line of the plurality of light-emitting elements, and
the first light-emitting element in the first group and a third light-emitting element in the second group are connected by a second branch line located on the second side of the line of the plurality of light-emitting elements.
16. The display apparatus of claim 12 , wherein a K-th light-emitting element in the plurality of light-emitting elements is connected in series to a (K+2N+1)-th light-emitting element by a first branch line, and a (K+L)-th light-emitting element is connected in series to a (K+2N+1−L)-th light-emitting element by a second branch line, wherein N is equal to a number of branch lines in the plurality of branch lines, and L is a number greater than or equal to 1 and less than or equal to N.
17. The display apparatus of claim 16 , wherein the first branch line and the second branch line are located on a same side of the line of the plurality of light-emitting elements.
18. The display apparatus of claim 16 , wherein the (K+2N+1)-th light-emitting element is connected in series to a (K+2N+2)-th light-emitting element by a third branch line, and the (K+2N+1−L)-th light-emitting element is connected in series to a (K+2N+2+L)-th light-emitting element by a fourth branch line.
19. The display apparatus of claim 18 , wherein the fourth branch line is located on the first side of the line of the plurality of light-emitting elements, and the first branch line and the second branch line are located on the second side of the line of the plurality of light-emitting elements.
20. The display apparatus of claim 12 , wherein a K-th light-emitting element in the plurality of light-emitting elements is connected in series to a (K+P)-th light-emitting element by a first branch line, and a (K+1)-th light-emitting element is connected in series to a (K+P+1)-th light-emitting element by a second branch line, wherein
P is a number greater than or equal to a number of branch lines in the plurality of branch lines,
the first branch line is located on the first side of the line of the plurality of light-emitting elements, and
the second branch line extends from the (K+1)-th light-emitting element towards the first side of the line of the plurality of light-emitting elements, passes between the (K+P)-th light-emitting element and a (K+P−1)-th light-emitting element, and is connected to the (K+P+1)-th light-emitting element on the second side of the line of the plurality of light-emitting elements.