LCD Video Signal Line Layout for Reduced Propagation Delay
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Solution Overview
Problem
The phase development drive system for liquid crystal panels results in long video signal propagation paths, leading to signal delay and hindering high-speed drive.
Innovation Solution
The liquid crystal panel design includes a configuration with pull-in video signal lines that traverse the data line drive circuit, featuring a first pull-in video signal line with the shortest wiring length and a second pull-in video signal line with the longest length, along with a specific wiring layout that reduces the longest wiring lengths of the video signal lines to minimize signal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If video signal lines are arranged to avoid the data line drive circuit, then the wiring layout is simpler and easier to manufacture, but the propagation path becomes longer causing signal delay
Solution Approach 1:
Instead of routing video signal lines around the data line drive circuit (conventional approach), the patent inverts the routing strategy by having video signal lines traverse through the data line drive circuit region. This inverted approach shortens the propagation path and reduces signal delay, while the data line drive circuit continues to function normally by processing data lines that route through different paths.
Solution Approach 2:
The patent utilizes multi-layer wiring structure to resolve the routing conflict. Video signal lines are routed on different wiring layers than data lines, allowing them to traverse the data line drive circuit region in the planar view without actual physical interference. This dimensional separation enables shorter video signal paths while maintaining manufacturing simplicity.
2Loss of time
If video signal lines are arranged between the display region and data line drive circuit, then signal propagation path is shortened reducing delay, but the wiring layout becomes more complex
Solution Approach 1:
The patent segments the wiring into distinct functional groups: video signal lines traverse the data line drive circuit region, while data lines are routed through dedicated pathways. This segmentation allows video signal lines to take the direct path through the circuit region without interfering with data line routing, reducing video signal delay while maintaining overall wiring organization and manufacturability.
Solution Approach 2:
The data line drive circuit region serves dual functions: it processes data lines for pixel driving while also providing a transmission path for video signal lines. This multi-functionality allows the circuit region to be utilized more efficiently, shortening video signal paths without requiring additional dedicated space or increasing overall device complexity.
Data Source
AI summary
An electro-optical device includes a plurality of video signal lines and a plurality of pull-in video signal lines traversing a data line drive circuit. The pull-in video signal line includes a first pull-in video signal line having a shortest first wiring length and a second pull-in video signal line having a longest second wiring length. The video signal line includes a first video signal line electrically coupled to the first pull-in video signal line and a second video signal line electrically coupled to the second pull-in video signal line. A length from a first coupling point to one end of the first video signal line is a third wiring length. A length from the first coupling point to the other end of the first video signal line is a fourth wiring length.