Switchable Signal Readout Circuit for Photoelectric Conversion

The patent implements multi-functionality by enabling a single photoelectric conversion apparatus to perform multiple signal processing modes (autofocus, imaging, and other applications) through a unified circuit configuration that supports flexible signal readout methods. The apparatus can switch between different readout modes without requiring separate dedicated circuits for each function, thereby achieving versatility while controlling complexity.

The patent applies dynamics by introducing switchable signal readout methods that allow the circuit configuration to change dynamically between different modes (autofocus mode, imaging mode, etc.). The switch element enables the circuit to adapt its connectivity and signal processing path based on the required operation mode, providing flexibility without permanently increasing structural complexity.

The patent combines multiple photoelectric conversion portions (first and second photoelectric conversion portions) into a single integrated apparatus with a unified circuit arrangement. The switch element merges the signal paths from both photoelectric conversion portions, allowing them to be read out individually or in combination. This merging approach enables multiple processing modes without proportionally increasing overall device complexity.

The patent makes the circuit arrangement universal by designing it to handle signals from multiple photoelectric conversion portions through a common switchable architecture. The same circuit can process autofocus signals, imaging signals, or other applications by reconfiguring the switch connections, thereby supporting diverse processing modes without requiring separate dedicated circuits for each function.

The patent applies local quality by assigning different amplification gains (first gain and second gain) to different photoelectric conversion portions based on their specific functional requirements. The first photoelectric conversion portion uses a first amplification gain optimized for its function, while the second photoelectric conversion portion uses a second amplification gain optimized for its function. This localized optimization expands the overall dynamic range while keeping each individual circuit section relatively simple.

The patent changes the amplification gain parameter for different signal processing paths to optimize performance for specific applications. By adjusting the gain parameter independently for each photoelectric conversion portion, the system can expand its dynamic range to handle both weak and strong signals effectively, while the gain adjustment itself is implemented through relatively simple circuit modifications rather than complex processing architectures.