LCD Driving Circuit Delay Timing Dispersion
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Solution Overview
Problem
Conventional liquid crystal display (LCD) data drivers face issues with peak current dispersion and unnecessary radiation due to increased output frequency and higher definition, leading to inefficiencies and increased power consumption.
Innovation Solution
A driving circuit with a delay circuit that delays the control signal, allowing the load timing of display data to vary based on a fixed cycle, dispersing frequency components and reducing radiation by shifting the timing for each horizontal synchronization period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output frequency of display signals is increased to achieve higher definition and faster driving, then the display quality is improved, but unnecessary radiation and peak current increase
Solution Approach 1:
The patent applies periodic action by sequentially enabling groups of D/A converters rather than operating all converters simultaneously at high frequency. The control signal enables first group D/A converters, then second group D/A converters in a periodic sequence, which disperses the frequency components of the driving signals and reduces radiation while maintaining high definition display quality
Solution Approach 2:
The patent segments the D/A converters into multiple groups (first group and second group) and controls them separately with different timing. This segmentation allows the system to operate multiple converters at lower individual frequencies while achieving high overall bandwidth, thereby reducing radiation without compromising display quality
2Manufacturing precision
If the number of display signals is increased to achieve higher definition, then the display resolution is improved, but peak current and power consumption increase
Solution Approach 1:
The patent uses periodic enabling of converter groups to process multiple display signals sequentially rather than simultaneously. This allows high definition display with multiple signals while reducing peak current demands and power consumption by spreading the processing load over time
Solution Approach 2:
The patent dynamically controls the enabling timing of different D/A converter groups based on the display data timing. The control signal selectively enables first group D/A converters for first display data and second group D/A converters for second display data, optimizing power usage while maintaining high resolution
Data Source
AI summary
A driving circuit according to the present invention for driving a display apparatus based on display data and a control signal includes: a delay circuit for delaying the input control signal; and a data load section for loading the input display data to the display apparatus at a timing generated by the delayed control signal, where the delay circuit delays the control signal in such a manner that load timing at which the display data is loaded to the display apparatus varies according to fixed timing determined by a constant cycle.