Liquid Crystal Display Control Line Routing via Flexible Substrate Center
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices, the long wiring length of control signal lines from the flexible wiring substrate to the array substrate leads to voltage depression, signal delay, and attenuation, particularly when using an analog switch circuit, which degrades image quality.
Innovation Solution
The control lines for powering and controlling the analog switch circuit are routed from the center of the flexible wiring substrate directly to the liquid crystal display panel, minimizing their length and avoiding interference from interconnection resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If control lines are routed from the opposite end portions of the flexible wiring substrate to the array substrate, then the drive IC can be mounted on the flexible wiring substrate, but the wiring length becomes long causing voltage depression, signal delay, and attenuation
Solution Approach 1:
The control lines are routed through the center region of the flexible wiring substrate rather than along the opposite end portions, changing the spatial dimension of the routing path. This dimensional change in the routing strategy significantly shortens the wiring length while maintaining the drive IC mounting capability, thereby resolving the contradiction between ease of manufacture and signal quality reliability
2Ease of manufacture
If the wiring length of control signal lines is long, then the drive IC can be mounted on the flexible wiring substrate, but voltage depression and signal attenuation occur
Solution Approach 1:
By routing control lines through the center region of the flexible wiring substrate instead of along the periphery, the patent changes the spatial dimension of the routing path. This dimensional change reduces the wiring length to a minimum, thereby reducing interconnection resistance and voltage drop, while still allowing drive IC mounting
3Ease of manufacture
If control lines are routed along the flexible wiring substrate edges, then the drive IC can be installed, but signal delay and attenuation affect image quality
Solution Approach 1:
The patent changes the routing dimension from peripheral edge routing to center region routing of the flexible wiring substrate. This dimensional change minimizes wiring length and reduces signal delay and attenuation, thereby maintaining image quality while still allowing drive IC installation
Data Source
AI summary
A liquid crystal display device comprising a liquid crystal display panel 21 having pixels each disposed on an intersection between plural scan lines and plural signal lines, a flexible wiring substrate having mounted thereon a drive IC 24 electrical connected to the liquid crystal display panel 21 for supplying video signals via video signal lines, to one video signal line of which N number of the signal lines are allocated, wherein N is an integer of two or more, an analog switch circuit switch-connected to a signal line selected from the N number of the signal lines in each of the video signal lines, and the control lines 26 formed across a region in which the drive IC 24 has been mounted on the flexible wiring substrate 23 and drawn from a center of the flexible wiring substrate 23 onto the liquid crystal display panel 21 for supplying at least a power source for driving the analog switch circuit or a control signal.