Flexible Display Insulating Layer Stress Equalization
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Solution Overview
Problem
In liquid crystal display devices, the wires in the liquid crystal region and seal region experience different levels of stress when the device is bent, leading to potential wire breakage and reduced reliability due to the differing layer structures, making it difficult to alleviate stress effectively.
Innovation Solution
The display device incorporates flexible substrates with insulating layers of different thicknesses or materials in the liquid crystal and seal regions, adjusting the neutral face positions to equalize stress on wires, thereby reducing the difference in stress applied to source and gate wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display device is bent in a display region to reduce bezel size, then the bezel is not visually recognized by the viewer, but the wire experiences different levels of stress in the liquid crystal region and seal region, leading to potential wire breakage
Solution Approach 1:
The patent applies local quality by making the insulating layer thickness different in the seal region compared to the liquid crystal region. Specifically, the insulating layer in the seal region has a greater thickness than in the liquid crystal region, creating localized structural differences that compensate for stress distribution when the device is bent.
Solution Approach 2:
The patent changes the physical parameter of the insulating layer (thickness) to alter the stress characteristics of the wire in different regions. By increasing the insulating layer thickness in the seal region, the neutral face position shifts, which equalizes the stress experienced by the wire in both the liquid crystal and seal regions during bending.
2Ease of manufacture
If the insulating layer has uniform thickness across the substrate, then the manufacturing process is simpler, but the wire experiences unequal stress distribution when bent, reducing device reliability
Solution Approach 1:
The patent implements local quality by specifying that the insulating layer has different thicknesses in different regions: a first thickness in the liquid crystal region and a second (greater) thickness in the seal region. This localized variation optimizes stress distribution while remaining compatible with standard manufacturing processes.
Solution Approach 2:
The patent addresses the stress distribution problem by introducing variation in the thickness dimension of the insulating layer. This dimensional change allows control over the neutral face position and stress characteristics without affecting the planar layout or requiring additional structural elements.
Data Source
AI summary
A display device includes a flexible first substrate, a flexible second substrate, a first layer, a first insulating layer in contact with the first layer, a second insulating layer in contact with the first layer, a liquid crystal layer between the first substrate and the second substrate, and a sealant sealing the liquid crystal layer and bonding the first substrate and the second substrate. The display device is bendable in a region inner to the sealant, the first substrate includes a seal region overlapping the sealant and a liquid crystal region overlapping the liquid crystal layer, the first insulating layer is in contact with the first layer in the seal region, the second insulating layer is in contact with the first layer in the liquid crystal region, and the first insulating layer and the second insulating layer have different thicknesses or are formed of different materials.