Source Driver Segmentation for Display Signal Integrity
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Solution Overview
Problem
Existing display technologies face challenges in efficiently driving large, high-resolution display apparatuses due to signal attenuation caused by RC loading, leading to uneven charging of sub-pixels and potential display quality issues.
Innovation Solution
A source driving circuit and method that includes a first and second source driver, each converting latched image data into data voltages based on specific triggering moments of data transmission control signals, with a time difference between these triggering moments to manage the output of data voltages across multiple output channels, ensuring uniform charging of sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single source driver outputs data voltages to multiple data lines simultaneously, then the output speed is high, but signal attenuation occurs due to RC loading causing uneven charging of sub-pixels
Solution Approach 1:
The patent divides a single source driver into multiple independent source drivers (first source driver and second source driver). Each source driver independently converts latched image data into data voltages and outputs them to different data lines. This segmentation reduces the RC loading on each data line, thereby reducing signal attenuation and ensuring uniform charging of sub-pixels while maintaining high output speed through parallel operation.
2Reliability
If multiple source drivers are used to reduce signal attenuation, then signal quality improves, but device complexity increases
Solution Approach 1:
The source driving circuit is segmented into multiple independent source drivers, each handling a subset of data lines. This segmentation improves signal quality by reducing RC loading on each data line while distributing the complexity across modular units, making the overall system more manageable and maintainable.
Solution Approach 2:
The patent employs periodic action by introducing a time difference between the output of data voltages from different source drivers. The first source driver outputs data voltages based on a first triggering moment, while the second source driver outputs data voltages based on a second triggering moment that is delayed relative to the first. This periodic staggering reduces simultaneous switching noise and further mitigates signal attenuation, improving signal quality without requiring complex synchronization circuits.
3Productivity
If data voltages are output simultaneously from all channels, then productivity is high, but uniform charging of sub-pixels cannot be achieved due to RC loading
Solution Approach 1:
The patent implements periodic action by staggering the output timing of data voltages from different source drivers. The first source driver outputs data voltages at a first triggering moment, while the second source driver outputs data voltages at a second triggering moment with a time difference. This periodic staggering ensures that sub-pixels are charged uniformly by avoiding simultaneous switching effects and reducing RC loading, while maintaining high productivity through parallel operation of multiple source drivers.
Data Source
AI summary
A source driving circuit includes a first source driver and a second source driver. The first source driver is configured to convert latched first image data into a plurality of first data voltages in response to a first triggering moment of a first data transmission control signal, and output the plurality of first data voltages based on a second triggering moment of the first data transmission control signal. The second source driver is configured to convert latched second image data into a plurality of second data voltages in response to a first triggering moment of a second data transmission control signal, and output the plurality of second data voltages based on a second triggering moment of the second data transmission control signal. The second triggering moment of the first data transmission control signal and the second triggering moment of the second data transmission control signal have a time difference.