Multilayer Display Signal Routing for Low-Resistance Narrow Bezels
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Solution Overview
Problem
As display panel sizes with high resolution increase, the resistance of signal lines also increases, leading to deteriorated display characteristics, necessitating research to reduce signal line resistance and improve scan time for enhanced display quality.
Innovation Solution
A display device design featuring signal lines in different layers, with a base layer having distinct portions and insulating layers, where signal lines are strategically positioned and connected to reduce resistance and improve aesthetics by minimizing the bezel width, using specific metal materials and insulating layers to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the display panel increases to achieve high resolution, then the display quality improves, but the resistance of signal lines increases leading to deteriorated display characteristics
Solution Approach 1:
The patent applies dimensionality change by routing signal lines through multiple layers (front signal lines in first and second layers, connection lines in third layer, rear signal lines in fourth layer) rather than single-plane traces. This multi-layer three-dimensional arrangement reduces signal path resistance while maintaining high resolution display quality, directly resolving the contradiction between resolution improvement and display characteristic deterioration.
2Measurement precision
If the number of signal lines increases to correspond to increased display panel size, then the display resolution improves, but the resistance of signal lines increases
Solution Approach 1:
The patent implements multi-layer signal line routing where front signal lines are disposed in first and second layers, connection lines in a third layer, and rear signal lines in a fourth layer. This vertical stacking in multiple dimensions reduces the effective path length and resistance of signal lines while supporting increased pixel counts for high resolution displays.
Solution Approach 2:
The patent employs composite material structures with different metal materials for signal lines in different layers. Specifically, front signal lines use a first metal material while connection and rear signal lines use a second metal material with different electrical properties. This composite approach optimizes the overall electrical performance and reduces total signal line resistance across the multi-layer structure.
3Area of stationary object
If signal lines are arranged in the non-display area, then the display area can be maximized, but the bezel width increases reducing aesthetic appeal
Solution Approach 1:
The patent moves signal line routing from the two-dimensional plane of the display area into the third dimension by utilizing multiple stacked layers. Front signal lines occupy first and second layers, connection lines the third layer, and rear signal lines the fourth layer. This vertical arrangement confines signal lines within the non-display area without increasing bezel width, maintaining both maximum display area and aesthetic appearance.
Data Source
AI summary
A display device includes: a base layer comprising a first portion, a second portion extending from the first portion, and a third portion extending from the second portion; a first light emitting element disposed on the first portion; a first front signal line electrically connected to the first light emitting element and disposed on the first portion; a second front signal line electrically connected to the first front signal line, disposed on the first portion, disposed in a different layer from the first front signal line, and overlapping the first front signal line; a first connection line electrically connected to the first and second front signal lines, disposed on the second portion, and disposed in a different layer from the first and second front signal lines; and a first rear signal line electrically connected to the first connection line and disposed on the third portion.