Display Device Input Sensing Layer Mesh Line Visual Patterns
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Solution Overview
Problem
Display devices face challenges in achieving improved visibility and sensing performance due to the influence of input sensors on luminous efficiency and external light reflectance, particularly when conductors are positioned on the display panel.
Innovation Solution
A display device design incorporating a display panel with light emitting regions and an input sensing layer featuring mesh lines and visual patterns that protrude or recess from these lines, optimizing the arrangement to enhance visibility and sensing performance while minimizing the impact on luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductor is positioned on the display panel for touch sensing, then sensing performance is improved, but luminous efficiency deteriorates and external light reflectance increases
Solution Approach 1:
The conductor is divided into mesh lines forming a grid pattern with multiple openings, allowing light to pass through the openings and reducing the overall blocking area, thereby improving luminous efficiency while maintaining sensing functionality through the conductive mesh structure
Solution Approach 2:
Visual patterns are added at specific locations (cut portions of the mesh lines) to locally compensate for the light blocking effect, creating areas with different optical properties that collectively improve overall luminous efficiency while preserving sensing performance in critical areas
2Reliability
If a conductor is positioned on the display panel for touch sensing, then sensing performance is improved, but visibility deteriorates due to increased external light reflectance
Solution Approach 1:
Visual patterns are strategically placed at cut portions of the mesh lines to locally modify light reflection characteristics, reducing the overall visual impact of the conductor and improving display visibility while maintaining sensing functionality
Solution Approach 2:
The mesh lines are designed with asymmetric features including cut portions and visual patterns with specific geometries (semi-circular, semi-elliptical, or rectangular with rounded corners) that optimize both optical performance and sensing capability
3Loss of energy
If mesh lines with openings are used for sensing, then luminous efficiency is improved, but sensing performance deteriorates due to reduced conductor continuity
Solution Approach 1:
The continuous conductor is segmented into mesh lines with openings, improving luminous efficiency while the interconnected grid structure maintains sufficient electrical continuity for touch sensing through the distributed conductive paths
Solution Approach 2:
Visual patterns serve as intermediary elements at cut portions, providing both optical compensation to maintain visibility and electrical connection pathways that preserve conductor continuity and sensing performance
Data Source
AI summary
A display device including: a display panel including a plurality of light emitting regions; and an input sensing layer disposed on the display panel, and including a plurality of sensing units, wherein the plurality of sensing units include: a plurality of mesh lines in which a plurality of openings respectively overlapping the plurality of light emitting regions are defined; and a plurality of visual patterns protruding from the plurality of mesh lines towards one of the plurality of light emitting regions or recessed away from one of the plurality of light emitting regions, wherein: a cut portion connecting two adjacent openings among the plurality of openings is provided in the plurality of mesh lines; and at least one of the plurality of visual patterns overlaps the cut portion in one direction.