Patent ID: 8450740

Claim:
A method for manufacturing a display panel, the method comprising: forming a light blocking layer on a substrate; forming an insulating layer on the light blocking layer; forming a first semiconductor of a first light sensing transistor on the insulating layer, and a first ohmic contact pattern, a first etch stopping pattern, and a second etch stopping pattern on the first semiconductor; forming a buffer layer on the insulating layer, a second semiconductor of a second light sensing transistor on the buffer layer, and a second ohmic contact pattern on the second semiconductor; exposing the first etch stopping pattern by removing the second etch stopping pattern after forming the first ohmic contact pattern or the second ohmic contact pattern; forming a source electrode and a drain electrode of the first light sensing transistor and a source electrode and a drain electrode of the second light sensing transistor on the first etch stopping pattern and the second ohmic contact pattern, respectively; forming an etch stopping layer and a first ohmic contact by etching the first etch stopping pattern and the first ohmic contact pattern using the source electrode and the drain electrode of the first light sensing transistor as a mask; and forming a second ohmic contact by etching the second ohmic contact pattern using the source electrode and the drain electrode of the second light sensing transistor as a mask, wherein the first etch stopping pattern, the source electrode and the drain electrode of the first light sensing transistor, and the source electrode and the drain electrode of the second light sensing transistor are comprised of the same material, and the first light sensing transistor and the second light sensing transistor are configured to sense different wavelengths.