Multi-Level Conductive Contact Layout for Foldable Display Image Quality
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Solution Overview
Problem
Existing display apparatuses, particularly flexible and foldable ones, face challenges in maintaining image quality due to issues like external light reflection and layer planarization, which can lead to deterioration in display performance.
Innovation Solution
A display apparatus design featuring a substrate with a display area and peripheral area, including a first and second conductive layer with holes, and a planarization layer comprising multiple organic insulating layers to reduce coupling between conductive layers and minimize external light reflection, thereby enhancing image quality and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer insulating structure is used, then the manufacturing process is simple, but light reflection occurs and image quality deteriorates when folded or curved
Solution Approach 1:
The planarization layer is divided into multiple organic insulating layers (first organic insulating layer, second organic insulating layer, third organic insulating layer) with different hole patterns. Each layer segments the light path and reduces reflection differently, collectively improving image quality without requiring a complex polarization layer
Solution Approach 2:
The patent introduces a vertical stacking dimension by creating multiple insulating layers at different heights, each with offset hole patterns. This multi-level structural arrangement in the vertical dimension provides superior light reflection control compared to conventional single-layer planar structures
2Stability of the object's composition
If the conductive layers are kept separate without contact, then electrical insulation is maintained, but the structural stability deteriorates when folded or curved
Solution Approach 1:
The patent applies different properties to different regions: the first and second conductive layers contact each other at specific peripheral locations for structural stability, while the offset hole patterns in the insulating layers prevent light reflection paths. This localized differentiation resolves both requirements simultaneously
Solution Approach 2:
The organic insulating layers with offset hole patterns serve as intermediaries between the conductive layers. They allow controlled contact points for structural stability while their offset hole structures interrupt light reflection paths, mediating between electrical and optical requirements
3Reliability
If a polarization layer is added to reduce light reflection, then image quality improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the light reflection control function from the conventional polarization layer and redistributes it across multiple organic insulating layers within the existing planarization structure. This eliminates the need for a separate polarization layer while maintaining image quality
Solution Approach 2:
The organic insulating layers perform multiple functions: they provide electrical insulation, enable planarization, and control light reflection through their offset hole patterns. This multi-functionality replaces the specialized polarization layer, simplifying the overall manufacturing process
Data Source
AI summary
A display apparatus includes: a substrate having a display area and a peripheral area outside the display area; a first conductive layer on the substrate in the peripheral area and including a first hole; a second conductive layer on the first conductive layer and overlapping the first conductive layer, the second conductive layer including a second hole; a planarization layer extending from the display area to the peripheral area and including at least two organic insulating layers between the first conductive layer and the second conductive layer; and a display element on the planarization layer in the display area, wherein a part of a portion of the second conductive layer except for the second hole is in contact with a part of a portion of the first conductive layer except for the first hole.