TFT Substrate Triple-Layer Conductive Structure Etching

The conductive layer is divided into three distinct layers (first, second, and third layers) with different materials and functions. The first layer provides basic conductivity, the second layer enhances signal transmission, and the third layer provides protective and conductive properties. This segmentation allows each layer to be optimized independently for its specific function, resolving the contradiction between enhanced performance and structural complexity.

The patent employs composite material structure by combining different conductive materials across three layers. Each layer uses materials selected for specific properties (e.g., transparency, conductivity, etch resistance), creating a composite structure that achieves superior overall performance compared to single-material designs, while the systematic layering manages the complexity through functional differentiation.

Different etching rates are applied to different layers based on their local requirements. The first layer uses a first etching rate, the second layer uses a second etching rate, and the third layer uses a third etching rate. This local quality approach allows each layer to be etched with the precise rate needed for its specific function, achieving high manufacturing precision while managing the overall ease of manufacture through systematic differentiation.

The patent changes the etching rate parameter across different layers to achieve the desired groove profile. By systematically varying the etching rate parameter from one layer to the next, the patent creates a controlled gradient structure that improves structural integrity and signal transmission while making the etching process more manageable through parameter optimization.