GOA Pull-Up Circuit for Residual Charge Release Stability

The pull-up control module is segmented into multiple functional components: a pull-up module with first and second switches for generating pull-up control signals, a pull-down module with third and fourth switches for releasing residual charges, and a maintaining module with fifth and sixth switches for maintaining signal levels. This segmentation allows each module to perform its specific function independently, resolving the contradiction by enabling residual charge release without requiring a complete redesign of the entire control module.

The patent introduces a bootstrap capacitor as an intermediary element that stores voltage signals and facilitates the operation of the pull-up and pull-down modules. The capacitor acts as a mediator between the switch control signals and the actual switch operations, enabling precise control of residual charge release while maintaining signal stability. This intermediary component helps resolve the contradiction by providing a buffer that manages the complexity of charge release timing.

The pull-down module operates periodically to release residual charges from the switches. The third and fourth switches are controlled in a periodic manner based on the stage signals, creating a rhythm of charge accumulation and release that maintains switch performance. This periodic action ensures that residual charges are cleared at appropriate intervals, preventing threshold voltage drift while maintaining a relatively simple control structure through systematic timing.

The patent implements feedback mechanisms where the output signals from the pull-up module are fed back to control the pull-down module's switching operations. The stage signals and scan signals provide feedback information that triggers the release of residual charges when needed. This feedback system automatically adjusts the charge release timing based on circuit operation states, improving stability without requiring complex external control logic.

The additional switches in the pull-down module are designed to perform multiple functions: releasing residual charges from the pull-up switches, maintaining signal levels during transitions, and preparing the circuit for the next operation cycle. By making these switches multi-functional, the patent reduces the need for even more components, as each switch contributes to multiple aspects of circuit operation. This universality helps offset the complexity increase by maximizing the utility of each additional component.

The patent merges the pull-up control function and the residual charge release function into a single integrated control module structure. The first through sixth switches are organized in a combined architecture where the pull-up and pull-down operations are coordinated through shared control signals and timing mechanisms. This merging approach prevents the need for separate independent modules, thereby limiting the complexity increase to only what is strictly necessary for residual charge management rather than requiring fully separate control circuits.