Liquid Crystal Display Device EMI Reduction via Segmented Clock Frequencies
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Solution Overview
Problem
High-resolution liquid crystal display devices face increased electromagnetic interference (EMI) due to higher display data transmission speeds, which is exacerbated by higher resolutions.
Innovation Solution
A liquid crystal display device with a control circuit that includes a receiving circuit, memory element, and multiple transmitting circuits, where display data is transmitted to different display regions with varying clock frequencies, dispersing electromagnetic wave noise frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display resolution is increased, then display quality is improved, but electromagnetic interference is increased
Solution Approach 1:
The patent divides the display screen into multiple regions and uses multiple transmitting circuits with different clock frequencies to drive different regions. This segmentation approach reduces the data transmission speed required for each circuit, thereby reducing electromagnetic interference while maintaining high overall display resolution
Solution Approach 2:
Different transmitting circuits are assigned different clock frequencies based on their specific display region requirements. This local differentiation allows each circuit to operate at an optimized frequency that reduces EMI while still achieving the required display quality for its specific region
2Productivity
If display data transmission speed is increased, then productivity is improved, but electromagnetic interference is increased
Solution Approach 1:
The patent segments the display data transmission into multiple parallel channels, each with lower individual transmission speeds but collectively achieving high overall productivity. This segmentation reduces the electromagnetic interference generated by each individual transmission channel while maintaining high total data throughput
3Object-generated harmful factors
If display data is divided into multiple regions, then electromagnetic interference is reduced, but device complexity is increased
Solution Approach 1:
The patent divides the display into multiple regions driven by separate transmitting circuits with different clock frequencies. This segmentation reduces EMI by lowering individual transmission speeds, and the modular structure allows for systematic management of the increased circuit complexity
Data Source
AI summary
A liquid crystal display device which includes a drive circuit capable of reducing electromagnetic wave noises while performing a high-definition multi-grayscale display is provided. In a liquid crystal display device, low-voltage differential signals divided into a plurality of channels are received by a receiving circuit, display data is recorded in a storage element after being arranged, and the display data is outputted to drive circuits on a liquid crystal display panel from a transmitting circuit at different frequencies. A display region of the liquid crystal display panel is divided into a plurality of divided display regions, and respective divided display regions differ from each other in the number of pixels thus making transmission clock frequencies different from each other.