Display Panel TFT Layout for Narrow-Bezel GOA Integration

The patent transitions from conventional planar TFT structures to vertical channel TFT structures, utilizing the vertical dimension to increase current handling capability without expanding the horizontal footprint. The vertical channel orientation allows carriers to move perpendicular to the substrate plane, enabling higher current density within the same planar area, thus resolving the contradiction between power handling and area occupation.

The patent modifies key structural parameters of the TFT, including channel orientation (from horizontal to vertical), channel length, and width dimensions. By optimizing these parameters, the device achieves enhanced current carrying capacity while maintaining compact footprint. The vertical channel configuration specifically changes the geometric parameters to improve current density without proportionally increasing device area.

The patent combines multiple separate photomask processes into a single integrated process step. Specifically, the gate electrode layer and drain electrode layer are formed simultaneously in one photomask exposure and development cycle, rather than requiring separate sequential steps. This merging reduces the total number of process steps while maintaining alignment precision through unified pattern formation.

The patent employs a multi-functional photomask design that serves multiple purposes in a single step. The same photomask pattern defines both the gate electrode geometry and the drain electrode geometry, making the patterning process universal for creating multiple critical structures. This approach eliminates the need for separate specialized patterning steps for each electrode type.