Patent ID: 7288477

Claim:
A method of forming an electro-luminescence device, comprising: forming a gate bus line extending in a first direction over a substrate; forming a data bus line extending in a second direction over the substrate; forming a power supply line extending parallel to the data bus line over the substrate; forming a switching transistor electrically connected to the gate bus line, the step of forming a switching transistor comprising: forming a first gate electrode extending from the gate bus line; forming a first semiconductor pattern over the first gate electrode; forming a first etch stop pattern over the first semiconductor pattern; forming a second semiconductor pattern over the first semiconductor pattern at one side of the first etch stop pattern; forming a third semiconductor pattern over the first semiconductor pattern at another side of the first etch stop pattern; forming a first source electrode over the second semiconductor pattern, the first source electrode extending from the data bus line; and forming a first drain electrode over the third semiconductor pattern; forming a driving transistor electrically connected to the power supply line, the step of forming a driving transistor comprising: forming a second gate electrode electrically connected to the first drain electrode of the switching transistor; forming a fourth semiconductor pattern over the second gate electrode; forming a second etch stop pattern over the fourth semiconductor pattern; forming a fifth semiconductor pattern over the fourth semiconductor pattern at one side of the second etch stop pattern; forming a sixth semiconductor pattern over the fourth semiconductor pattern at another side of the second etch stop pattern; forming a second source electrode over the fifth semiconductor layer, the second source electrode extending from the power supply line; and forming a second drain electrode over the sixth semiconductor layer; and forming an electro-luminescence element electrically connected to the second drain electrode of the driving transistor.