Patent ID: 6927464

Claim:
A flat panel display device, comprising: first to fourth semiconductor layers formed on a substrate, the first to fourth semiconductor layers including first to fourth source and drain regions, respectively, the second source and drain regions having a different conductivity from the first, third, and fourth source and drain regions; a gate insulating layer formed over an entire first surface of the substrate; first to fourth conductive patterns formed on portions of the gate insulating layer and corresponding to the first to fourth semiconductor layers, respectively; first to fourth gate electrodes formed on the first to fourth conductive patterns; a pixel electrode formed on a portion of the gate insulating layer adjacent to the fourth conductive pattern; an interlayer insulating layer formed over said entire first surface of the substrate; first to fourth source and drain electrodes contacting the first to fourth source and drain regions, respectively; a planarization layer formed over said entire first surface of the substrate; and an opening portion exposing the pixel electrode.