Source Driver Parallel Current Paths for Stable Charge Sharing
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Solution Overview
Problem
Existing source drivers face a trade-off between high driving ability and stability, where reducing resistance for improved driving ability compromises stability, and increasing resistance for stability reduces charge-sharing efficiency.
Innovation Solution
A source driver design that utilizes parallel current paths and adjustable resistances to dynamically manage resistance during driving and charge-sharing periods, allowing for enhanced driving ability and stability while maintaining efficient charge-sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the areas of the first output switch and the second output switch are increased to reduce equivalent resistance, then driving ability is improved, but system stability deteriorates
Solution Approach 1:
The patent divides the single current path into two parallel current paths (first current path through first output switch, second current path through second output switch). This segmentation allows the system to achieve lower equivalent resistance (improved driving ability) while maintaining stability through the balanced parallel structure and controlled switching between paths.
2Productivity
If the resistances of the first resistor and the second resistor are reduced to improve charge-sharing efficiency, then charge-sharing efficiency is improved, but system stability deteriorates
Solution Approach 1:
The patent segments the charge-sharing function into two parallel paths with respective resistors. During charge-sharing mode, both paths operate in parallel, effectively reducing the total resistance and improving charge-sharing efficiency while the parallel structure inherently maintains system stability through redundancy and balanced charge distribution.
3Stability of the object's composition
If the areas of the first output switch and the second output switch are decreased to increase equivalent resistance, then system stability is improved, but driving ability deteriorates
Solution Approach 1:
The patent employs dynamic switching control between two parallel current paths. The control circuit dynamically selects which path(s) to activate based on operational requirements - using both paths in parallel for high driving ability, or switching to single-path mode for enhanced stability, thus adapting the resistance characteristics to different operational states.
4Stability of the object's composition
If the resistances of the first resistor and the second resistor are increased to improve system stability, then system stability is improved, but charge-sharing efficiency deteriorates
Solution Approach 1:
The patent segments the resistance function into two parallel resistors (first resistor in first current path, second resistor in second current path). When both paths are activated during charge-sharing, the parallel combination yields lower effective resistance, improving charge-sharing efficiency while each individual resistor maintains appropriate resistance for stability when operating in single-path mode.
Data Source
AI summary
A source driver includes an output buffer for outputting a driving signal; a first current path coupled between the output buffer and a data line; and a second current path coupled in parallel to the first current path. During a first driving period, the output buffer utilizes both the first current path and the second current path to drive the data line. During a second driving period, the output buffer utilizes only the first current path to transmit the driving signal so as to improve the stability of the source driver.