Display Panel Driver EMI Noise Suppression via Signal Path Optimization
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Solution Overview
Problem
The increasing resolution and data transfer speed in liquid crystal display panels lead to increased electromagnetic interference (EMI) noise due to the larger number of transmission lines required, which also occupies more space around the display panel, posing challenges for reducing the non-display area and connection substrate size.
Innovation Solution
A display panel driver is designed with an interface for receiving low-voltage differential signals, a timing controller for generating display control signals, and a signal line driving portion for outputting driving signals, where the transmission path lengths and frequencies are optimized to minimize EMI noise, and the driver is integrated onto a substrate with the display panel to reduce space and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of transmission lines is increased to support higher resolution and data transfer speed, then the data transfer capability is improved, but the EMI noise increases and the wiring space occupies more area
Solution Approach 1:
The patent merges the interface, timing controller, and signal line driving portion into a single integrated circuit. This consolidation reduces the number of separate components and their interconnections, thereby decreasing the overall wiring space and reducing EMI noise generation while maintaining high data transfer speeds through optimized internal signal routing
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it receives low-voltage differential signals, generates timing control signals, and drives signal lines of the display panel. By combining these functions into one universal component, the patent eliminates the need for separate TTL/CMOS signal transmission lines, reducing both wiring complexity and EMI noise
2Manufacturing precision
If the number of transmission lines is increased to support higher resolution, then the display quality is improved, but the wiring space around the display panel increases
Solution Approach 1:
The patent integrates the timing controller and signal line driving portion into a single IC mounted on the display panel substrate. This merging eliminates the need for external connection substrates and reduces wiring space around the display panel, while still supporting high resolutions through efficient internal signal distribution
Solution Approach 2:
The patent transitions from a distributed architecture (separate ICs connected by transmission lines) to an integrated architecture (single IC on substrate). This dimensional change consolidates components into the same plane as the display panel, eliminating the need for surrounding wiring space and connection substrates
3Adaptability or versatility
If separate TTL/CMOS signal transmission is used from timing controller to source drivers, then the signal compatibility is improved, but the EMI noise is radiated and wiring space is required
Solution Approach 1:
The patent combines the timing controller and signal line driving portion into a single integrated circuit, eliminating the need for separate TTL/CMOS signal transmission lines. This integration maintains signal compatibility through internal optimized routing while completely eliminating EMI noise radiation from external transmission lines
Solution Approach 2:
The patent extracts the problematic external transmission lines from the system by integrating all signal generation and distribution functions into a single IC. This extraction eliminates the source of EMI noise radiation while preserving signal compatibility through internal design
Data Source
AI summary
The relationship L1≦V(F1×∈11/2×100) is satisfied where a transmission path length between the interface 1 and the timing controller is L1, a propagating speed of electromagnetic waves in a vacuum is V, a frequency of a signal transmitted between the interface and the timing controller is F1, and a comparative dielectric constant of a transmission path medium between the interface and the timing controller is ∈1. The relationship L2≦V(F2×∈21/2×100) is satisfied where a transmission path length between the timing controller and the signal driving portion is L2, a propagating speed of electromagnetic waves in a vacuum is V, a frequency of a signal transmitted between the timing controller and the signal line driving portion is F2, and a comparative dielectric constant of a transmission path medium between the timing controller and the signal line driving portion is ∈2. Thus, the occurrence of EMI noise can be suppressed, and the implementation cost of a display apparatus can be reduced.