Shift Register Circuit for Gate Driver Output Stability

The patent applies different transistor types to different functional blocks: N-type oxide TFTs are used specifically for scan and reset transistors where low leakage is critical, while LTPS TFTs are used for switching and driving transistors where high charge mobility is required. This local differentiation resolves the contradiction by optimizing each component for its specific functional requirement rather than using a uniform transistor type throughout the circuit.

The patent strategically deploys LTPS TFTs only in specific blocks (switching and driving transistors) where high charge mobility provides the most benefit, while using the lower-cost N-type oxide TFTs in other blocks (scan and reset transistors). This selective application reduces overall production costs compared to using LTPS TFTs throughout the entire circuit, while still achieving high charge mobility where it is most needed for the switching and driving functions.

The patent divides the pixel driving circuit into distinct functional blocks (scan transistor block, reset transistor block, switching transistor block, driving transistor block) and assigns specific transistor types to each block. This segmentation allows the circuit to achieve improved performance through mixed transistor types while managing complexity by organizing the mixed technology into clear, functional segments with well-defined roles.