Flexible circuit board for all-in-one chip on film, chip package including same, and electronic device including same
A flexible circuit board for all-in-one chip on film according to an embodiment may include: a substrate; a conductive pattern part disposed on the substrate; and a protective layer partially disposed on the conductive pattern part, wherein the conductive pattern part includes a first conductive pattern part and a second conductive pattern part which are spaced apart from each other, each of the first conductive pattern part and the second conductive pattern part includes a wiring pattern layer, a first plating layer, and a second plating layer that are sequentially placed on the substrate, the first conductive pattern part includes a first open region in which the protective layer is open, the second conductive pattern part includes a second open region in which the protective layer is open, and a content of tin of the second plating layer in the first open region is greater than that of the second plating layer in the second open region.
1. A flexible circuit board for all-in-one chip on film, the flexible circuit board comprising:
a substrate;
a conductive pattern part disposed on the substrate; and
a protective layer partially disposed on the conductive pattern part,
wherein the conductive pattern part includes a first conductive pattern part and a second conductive pattern part which are spaced apart from each other,
each of the first conductive pattern part and the second conductive pattern part includes a wiring pattern layer, a first plating layer, and a second plating layer that are sequentially placed on the substrate,
the first conductive pattern part includes a first open region in which the protective layer is open,
the second conductive pattern part includes a second open region in which the protective layer is open, and
a content of tin of the second plating layer in the first open region is greater than that of the second plating layer in the second open region.
2. The flexible circuit board of claim 1 , wherein the content of tin (Sn) of the second plating layer is 50 atomic % or more in the first open region, and
the content of tin (Sn) of the second plating layer is less than 50 atomic % in the second open region.
3. The flexible circuit board of claim 1 , wherein the second plating layer is an alloy layer of copper (Cu) and tin (Sn) in the second open region.
4. The flexible circuit board of claim 1 , wherein the first conductive pattern part includes a first lead pattern part positioned at one end and the other end of the first conductive pattern part, and a first extension pattern part connecting the one end and the other end of the first conductive pattern part,
the second conductive pattern part includes a second lead pattern part positioned at one end and the other end of the second conductive pattern part, and a second extension pattern part connecting the one end and the other end of the second conductive pattern part, and
the first lead pattern part is different from the second lead pattern part in shape.
5. The flexible circuit board of claim 4 , wherein a line width of the first lead pattern part is smaller than that of the second lead pattern part.
6. The flexible circuit board of claim 4 , wherein a line width of the first lead pattern part corresponds to a line width of the first extension pattern part, and
a line width of at least one end portion of the second lead pattern part is different from a line width of the second extension pattern part.
7. The flexible circuit board of claim 4 , wherein the first conductive pattern part includes a plurality of first conductive pattern parts spaced at a first distance on the substrate,
the second conductive pattern part includes a plurality of second conductive pattern parts spaced at a second distance on the substrate, and
the first distance is smaller than the second distance.
8. A chip package which comprises a flexible circuit board for all-in-one chip on film, the flexible circuit board comprising:
a substrate;
a conductive pattern part disposed on the substrate; and
a protective layer partially disposed on the conductive pattern part,
wherein the conductive pattern part includes a first conductive pattern part and a second conductive pattern part which are spaced apart from each other,
each of the first conductive pattern part and the second conductive pattern part includes a wiring pattern layer, a first plating layer, and a second plating layer that are sequentially placed on the substrate,
the first conductive pattern part includes a first open region in which the protective layer is open,
the second conductive pattern part includes a second open region in which the protective layer is open,
a content of tin of the second plating layer in the first open region is greater than that of the second plating layer in the second open region, and
a first chip is disposed in the first open region and a second chip is disposed in the second open region.
9. The chip package of claim 8 , wherein the first chip is a drive IC chip, and the second chip is at least one of a diode chip, a power supply IC chip, a touch sensor IC chip, a multilayer ceramic capacitor (MLCC) chip, a ball grid array (BGA) chip, and a chip condenser.
10. The chip package of claim 8 , wherein the first chip and the second chip are disposed on the same one surface of the flexible circuit board for all-in-one chip on film.
11. The chip package of claim 8 , wherein the first conductive pattern part includes a first inner lead pattern part positioned at one end of the first conductive pattern part, a first outer lead pattern part positioned at the other end of the first conductive pattern part, and a first extension pattern part connecting the one end and the other end of the first conductive pattern part,
the second conductive pattern part includes a second inner lead pattern part positioned at one end of the second conductive pattern part, a second outer lead pattern part positioned at the other end of the second conductive pattern part, and a second extension pattern part connecting the one end and the other end of the second conductive pattern part,
a first connection part and the first chip are disposed on the first inner lead pattern part, and
a second connection part and the second chip are disposed on the second inner lead pattern part.
12. The chip package of claim 11 , wherein the first connection part and the second connection part have different sizes and different shapes.
13. The chip package of claim 11 , wherein the first connection part includes gold (Au), and
the second connection part includes a metal other than gold (Au).
14. The chip package of claim 11 , wherein the second plating layer of the first inner lead pattern part is a pure tin layer having a content of tin (Sn) of 50 atomic % or more, and
the second plating layer of the second inner lead pattern part is a tin alloy layer having a content of tin (Sn) of less than 50 atomic %.
15. The chip package of claim 11 , wherein a width of the first inner lead pattern part and a width of the first connection part are equal to each other or have a difference of 20% or less, and
a width of the second connection part is not less than 1.5 times a width of the second inner lead pattern part.
16. An electronic device comprising:
a flexible circuit board for all-in-one chip on film including:
a substrate;
a conductive pattern part disposed on the substrate; and
a protective layer partially disposed on the conductive pattern part,
wherein the conductive pattern part includes a first conductive pattern part and a second conductive pattern part that are spaced apart from each other,
each of the first conductive pattern part and the second conductive pattern part includes a wiring pattern layer, a first plating layer, and a second plating layer that are sequentially disposed on the substrate,
the first conductive pattern part includes a first open region in which the protective layer is open,
the second conductive pattern part includes a second open region in which the protective layer is open, and
a content of tin of the second plating layer in the first open region is greater than that of the second plating layer in the second open region;
a display panel connected to one end of the flexible circuit board for all-in-one chip on film; and
a main board connected to the other end opposite to the one end of the flexible circuit board for all-in-one chip on film.
17. The electronic device of claim 16 , wherein a first chip disposed in the first open region and a second chip disposed in the second open region of the flexible circuit board for all-in-one chip on film are different types,
the display panel and the main board are disposed facing each other, and
the flexible circuit board for all-in-one chip on film is bent and disposed between the display panel and the main board.
18. The flexible circuit board of claim 1 , wherein a content of tin (Sn) of the second plating layer in the first open region is 70 atomic % or more.
19. The flexible circuit board of claim 1 , wherein a content of tin (Sn) of the second plating layer in the first open region is 90 atomic % or more.
20. The flexible circuit board of claim 4 , wherein the protective layer is disposed on the first extension pattern part and the second extension pattern part, and
one surfaces of the first lead pattern part and the second lead pattern part are exposed to the outside.