Auxiliary Resistor Signal Reflection Reduction in LCD Driving
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Solution Overview
Problem
Existing driving apparatuses for liquid crystal displays face challenges in transmitting differential signals at high frequencies due to low signal quality, leading to noise tolerance issues and voltage-level misjudgments, making them unsuitable for high-frequency operations.
Innovation Solution
The driving apparatus incorporates a timing controller, pairs of transmission lines, source driving circuits, terminal resistors, and auxiliary resistors to generate and transmit differential signals, with auxiliary resistors reducing signal reflection and improving transmission quality, allowing for high-frequency operations by simplifying the architecture and regulating signal qualities across source driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working frequency is increased to meet high color depth, high resolution and high frame rate requirements, then the display performance is improved, but the signal quality of differential signals deteriorates and noise tolerance decreases
Solution Approach 1:
The patent introduces terminal resistors and auxiliary resistors as intermediary components between the timing controller and source driving circuits. These resistors act as signal quality regulators that compensate for signal degradation at high frequencies, enabling the system to maintain reliable signal transmission at working frequencies of 1 GHz or higher while meeting high color depth, resolution and frame rate requirements
2Productivity
If the working frequency is increased to 1 GHz or higher, then the display frame rate is improved, but voltage-level misjudgments occur in source driving circuits
Solution Approach 1:
The patent changes the electrical parameters of the transmission path by introducing terminal resistors and auxiliary resistors with specific resistance values. These resistors regulate the differential signal characteristics, stabilizing voltage levels and improving signal integrity at high frequencies, thereby preventing voltage-level misjudgments in source driving circuits during high frame rate operation
3Reliability
If auxiliary resistors are added to improve signal quality, then noise tolerance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality improvement by placing auxiliary resistors specifically at strategic locations between the timing controller and source driving circuits, rather than uniformly throughout the entire system. This targeted approach improves noise tolerance and signal quality at critical points while minimizing the overall increase in device complexity
Data Source
AI summary
A driving apparatus for driving a liquid crystal display panel includes a timing controller, a plurality of pairs of transmission lines, a plurality of source driving circuits, a plurality of terminal resistors, and a plurality of auxiliary resistors. The timing controller functions to generate a plurality of differential signals outputted via a plurality of output ports. Each output port includes two output ends for outputting a corresponding differential signal. Each pair of transmission lines is coupled to the timing controller for receiving a corresponding differential signal. Each source driving circuit is coupled to the pairs of transmission lines for receiving the differential signals so as to generate a plurality of data signals. Each terminal resistor is coupled between two terminals of a corresponding pair of transmission lines. Each auxiliary resistor is coupled between two output ends of a corresponding output port of the timing controller.