Oxide Semiconductor Drive Circuit with Selective Etch Stopping Layer

The patent divides the transistor structure into two segments: driving transistors include etch stopping layers for protection, while switching transistors exclude them to reduce complexity. This segmentation allows each part to be optimized for its specific function without compromising the other.

The etch stopping layer is applied locally only to driving transistors where channel protection is critical, rather than uniformly to all transistors. This local application optimizes manufacturing precision where needed while minimizing added complexity elsewhere.

The patent segments the transistor population into driving transistors (with etch stopping layers for reliability) and switching transistors (without etch stopping layers to minimize parasitic capacitance and power consumption). This segmentation balances reliability requirements against power consumption constraints.

The etch stopping layer is applied locally only where reliability is critical (driving transistors), while being omitted from switching transistors where parasitic capacitance directly impacts power consumption. This local differentiation optimizes the reliability-power tradeoff.

The etch stopping layer is introduced as a preliminary protective action during the manufacturing process, placed before channel-forming etching steps. This preliminary protection prevents channel damage that would otherwise occur during conventional manufacturing, improving reliability without significantly complicating the process.

The etch stopping layer acts as an intermediary protective layer between the etching process and the channel. This intermediary prevents direct contact between the etchant and the channel, thereby preventing channel damage and Mura phenomenon while maintaining manufacturing feasibility.