Input Sensor Mesh Layout for OLED Display Visibility
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Solution Overview
Problem
The conductor of the input sensor on the display panel affects the emission efficiency and external light reflectance of display devices, impacting visibility.
Innovation Solution
A display device with a display panel and input sensor design that includes emission areas, conductive patterns with mesh patterns of varying widths, and an auxiliary electrode configuration to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductor is added to the display panel for input sensing, then input detection capability is improved, but emission efficiency and external light reflectance are degraded
Solution Approach 1:
The conductor is divided into mesh patterns with multiple openings, segmenting the continuous conductive path into discrete elements. This allows light to pass through the openings while maintaining electrical connectivity for input sensing, thereby improving emission efficiency while preserving input detection capability.
Solution Approach 2:
The mesh pattern provides different properties in different regions: the conductor portions maintain electrical conductivity for sensing, while the openings provide optical transparency for light emission. This local differentiation resolves the contradiction between electrical functionality and optical performance.
2Reliability
If a conductor is added to the display panel for input sensing, then input detection capability is improved, but external light reflectance is degraded
Solution Approach 1:
By segmenting the conductor into mesh patterns with openings, the continuous reflective surface is broken into discrete elements. The openings allow external light to pass through without being reflected, while the mesh structure maintains the electrical conductivity needed for input detection.
Solution Approach 2:
The mesh pattern creates a porous-like structure where conductive material is distributed with voids in between. This porous configuration allows light transmission while maintaining electrical pathways, reducing external light reflectance while preserving input sensing capability.
3Illumination intensity
If mesh patterns with larger width are used to cover connection area, then visibility is improved, but emission area coverage is reduced
Solution Approach 1:
The mesh pattern width is locally adjusted: larger width at the connection area to improve visibility and electrical connection, while maintaining appropriate width at emission areas to preserve light emission coverage. This localized differentiation allows simultaneous optimization of both parameters.
Data Source
AI summary
Provided is a display device including a display panel including emission areas, and an input sensor above the display panel, and including conductive patterns, wherein the display panel includes a light-emitting element overlapping at least one of the emission areas, and including an anode, an emission layer above the anode, and a cathode above the emission layer, and an auxiliary electrode spaced apart from the anode in plan view, and electrically connected to the cathode at a connection area, wherein the conductive patterns include mesh patterns defining openings respectively overlapping the emission areas, the mesh patterns including a first mesh pattern having a first width, and a second mesh pattern including a portion having a second width that is greater than the first width, and including a portion entirely covering the connection area.