Touch Display Substrate Metal Light Blocking Layer Segmentation
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Solution Overview
Problem
Conventional One Glass Solution (OGS) touch display panels require thick light blocking layers to achieve satisfactory chrominance, leading to issues like broken lines and etch residues due to steep segment differences between the peripheral and touch control regions.
Innovation Solution
A substrate with a peripheral region featuring a thin metal light blocking layer, such as a molybdenum tantalum oxide alloy, and a planar layer that extends into the touch control region, reducing the overall thickness and segment difference while maintaining high optical density and aesthetic functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If thick light blocking layers are used to achieve satisfactory chrominance, then optical density is improved, but manufacturing precision deteriorates due to broken lines and etch residues
Solution Approach 1:
The light blocking layer is divided into multiple segments: a first light blocking layer (8-18 μm thick) and a second light blocking layer (1000-6000 Å thick) stacked in sequence. This segmentation allows each layer to have optimized thickness, preventing the formation of broken lines and etch residues while maintaining sufficient optical density for satisfactory chrominance.
Solution Approach 2:
The patent uses a composite structure combining two different light blocking materials with different thickness characteristics. The first layer provides bulk light blocking, while the second layer fine-tunes the optical density. This composite approach achieves satisfactory chrominance without requiring a single thick layer that would cause manufacturing defects.
2Illumination intensity
If thick light blocking layers are used to achieve satisfactory chrominance, then optical density is improved, but device complexity increases due to steep segment differences
Solution Approach 1:
By segmenting the light blocking structure into two layers with progressively decreasing thickness from peripheral to touch control regions, the patent creates a gradual transition rather than a steep segment difference. This reduces device complexity while maintaining satisfactory chrominance in the peripheral region.
Solution Approach 2:
The patent applies different light blocking layer configurations to different regions: the first light blocking layer covers the peripheral region with greater thickness for chrominance, while the second light blocking layer provides localized enhancement. This local quality approach satisfies regional optical requirements without creating overall device complexity.
3Device complexity
If thin light blocking layers are used to reduce device complexity, then manufacturing precision is improved, but optical density deteriorates leading to poor chrominance
Solution Approach 1:
The patent employs a composite light blocking structure where the first light blocking layer (thinner, 8-18 μm) reduces device complexity and manufacturing difficulties, while the second light blocking layer (1000-6000 Å) compensates for optical density. This composite design achieves both reduced complexity and satisfactory chrominance.
Solution Approach 2:
The patent changes the thickness parameter of the light blocking layers from a single thick layer to a stacked configuration with progressively thinner layers. This parameter optimization maintains sufficient total optical density for chrominance while reducing the maximum thickness that causes manufacturing and device complexity issues.
Data Source
AI summary
The present application discloses a substrate comprising a peripheral region, wherein the peripheral region comprises a first light blocking layer and a metal light blocking layer sequentially on a base substrate along a direction away from the base substrate.