Transmissive Display Structure With Inverse-Tapered Wiring Shielding
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Solution Overview
Problem
Display devices with integrated sensors face challenges in maintaining high light transmittance and protecting internal components from external light and electrostatic discharge, especially during manufacturing processes.
Innovation Solution
Incorporating inverse-tapered metal layers beneath the substrate to shield wirings and transistors, combined with a thin-film encapsulation layer to enhance light transmittance and protect against electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal layers are added to shield wirings and protect from electrostatic discharge, then reliability improves, but light transmittance deteriorates
Solution Approach 1:
The patent applies inverse-tapered metal layers only in specific regions where wiring protection is needed, rather than covering the entire sensor area. The metal layers are positioned to provide electrostatic discharge protection and shielding only where required, allowing light to pass through uncovered regions of the sensor area.
Solution Approach 2:
The patent uses inverse-tapered metal layers that extend from the first surface toward the second surface of the substrate but do not fully penetrate it. This dimensional approach allows the metal layers to provide protection in the vertical dimension while maintaining light transmittance in the horizontal dimension through the sensor area.
2Object-affected harmful factors
If metal layers are added to shield wirings, then protection from external light improves, but device complexity increases
Solution Approach 1:
The inverse-tapered metal layers are applied locally only where wiring protection is needed, rather than as a comprehensive shielding solution across the entire device. This localized approach provides external light shielding where required while avoiding unnecessary complexity in regions where protection is not needed.
Solution Approach 2:
The patent combines metal layers with the substrate material to create a composite structure that provides both mechanical support and electromagnetic shielding. This integration reduces overall device complexity compared to adding separate shielding components.
Data Source
AI summary
A display device includes: a substrate on which a pixel and a transmissive area are located, the pixel including a display element; a plurality of wirings on the substrate, the wirings being on one side of the transmissive area; a pixel electrode and an emission layer each included in the pixel; an opposite electrode on the emission layer and including an opening corresponding to the transmissive area; and a first metal layer overlapping the wirings, the first metal layer being below the wirings, wherein a lateral surface of the first metal layer has an inverse-tapered shape with respect to a top surface of the substrate.