Flexible Display Substrate Neutral-Layer Wiring for Narrow Bezels
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Solution Overview
Problem
Existing flexible display substrates face challenges in reducing the thickness and width of the lower frame due to the presence of power and fanout lines, which are often bent to minimize frame width but risk breakage and require additional UV glue, increasing thickness.
Innovation Solution
A display substrate design with a flexible substrate and multiple layers of electrical structures disposed between first and second flexible substrates, positioning wirings at the neutral layer to avoid the need for UV glue, thereby maintaining thickness and reducing frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If wirings are bent to minimize frame width, then the width of the lower frame is reduced, but the wirings risk breakage and require additional UV glue which increases thickness
Solution Approach 1:
The patent transitions the wiring from a planar configuration to a three-dimensional structure by positioning it between two flexible substrates. This spatial reconfiguration allows the wiring to maintain structural integrity while enabling frame narrowing, as the wiring is no longer constrained to a single plane where bending would cause stress concentration.
Solution Approach 2:
The wiring is nested between the first and second flexible substrates, creating a layered sandwich structure. This nesting protects the wiring from external mechanical stresses and eliminates the need for UV glue, as the substrates themselves provide the necessary structural support and protection.
2Reliability
If UV glue is added to secure bent wirings, then the wirings are protected from breakage, but the thickness of the display substrate increases
Solution Approach 1:
The patent merges the protective function previously performed by UV glue into the structural design itself. The two flexible substrates are bonded together through a bonding layer, integrating the protection mechanism into the substrate architecture rather than adding it as a separate external layer.
Solution Approach 2:
The patent extracts and eliminates the UV glue component from the structure. By redesigning the wiring support system to use the sandwich structure between substrates, the need for UV glue is completely removed, thereby preventing thickness increase.
3Stability of the object's composition
If multiple layers of electrical structures are positioned between flexible substrates, then structural integrity is maintained without additional thickness, but the device complexity increases
Solution Approach 1:
The flexible substrates serve multiple functions simultaneously: they provide mechanical support, electrical insulation, structural integrity, and protection for the wiring. This multi-functionality reduces the need for additional separate components, thereby managing complexity while maintaining integrity.
Solution Approach 2:
The display substrate is segmented into distinct functional layers (first flexible substrate, wiring layer, second flexible substrate), with each layer optimized for its specific function. This segmentation allows for modular manufacturing and assembly, managing complexity through standardized processes for each layer.
Data Source
AI summary
The display substrate comprises: a flexible substrate having a display area and a peripheral area located on at least one side of the display area, wherein the peripheral area sequentially comprises a wiring area, a bending area and a pad area along a direction away from the display area; a first electrical structure on a side of the bending area away from the pad area; a second electrical structure located in the pad area; wherein the flexible substrate comprises: a first flexible substrate; a second flexible substrate and a wiring, wherein the wiring have a first portion in the wiring area, a second portion in the bending area, and a third portion in the pad area, wherein the first electrical structure is connected to the first portion, and the second electrical structure is connected to the third portion.