Split Shift Register Unit for GOA Voltage Stability
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Solution Overview
Problem
Current GOA technology for liquid crystal display devices with a single-edge structure faces challenges in maintaining voltage at the far end of the driving circuit, as the signal output at the next shift register unit resets the current one to a low level, making it difficult to ensure voltage stability.
Innovation Solution
A shift register unit is designed with a split configuration, incorporating a pull-up module, input module, pull-down control module, reset discharging module, voltage dividing module, holding module, and far end pull-down module, which work together to maintain the signal output at a low level at the far end, ensuring voltage stability and space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-edge GOA structure is used, then the device complexity is reduced and space is saved, but the voltage stability at the far end of the driving circuit deteriorates
Solution Approach 1:
The shift register unit is divided into multiple functional modules: pull-up module, input module, pull-down control module, pull-down module, reset discharging module, voltage dividing module, holding module, and far end pull-down module. Each module performs a specific function, allowing independent optimization and control of voltage levels at different stages of the circuit.
Solution Approach 2:
Different modules are assigned different functions to address local voltage requirements. The far end pull-down module specifically targets the far end voltage stability issue, while other modules handle signal input, processing, and output. This localized functional assignment ensures voltage stability without requiring a complete structural redesign.
2Ease of operation
If the current shift register unit is reset to pull down the signal output end to low level, then the signal level is controlled, but it becomes difficult to guarantee the voltage at the far end of the driving circuit
Solution Approach 1:
The voltage dividing module acts as an intermediary between the pull-down control module and the far end pull-down module. It divides and distributes the control signals appropriately, ensuring that both the signal output end and the far end receive proper voltage control without direct interference.
Solution Approach 2:
The far end pull-down module autonomously maintains the voltage at the far end through its own control mechanism, independent of the main pull-down operation. This self-service capability ensures that voltage stability at the far end is maintained even during normal signal operations.
Data Source
AI summary
The present disclosure provides a shift register unit including a pull-up module, an input module, a pull-down control module, a pull-down module, a reset discharging module, a voltage dividing module, a holding module, and a far end pull-down module. The shift register unit is designed in a split manner in order to perform pull-down compensation to the output signal at the far end, saving the low voltage signal at the far end, thereby saving the space and facilitating the design. The present disclosure further provides a gate driving device and a display device using the shift register unit.