Touch Sensor Mesh Layout for OLED Display Visibility
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Solution Overview
Problem
Conductors in input sensors of display devices affect emission efficiency and external light reflectance, impacting visibility.
Innovation Solution
A display device design with conductive patterns including mesh patterns of varying widths and configurations to improve visibility by preventing voltage drop and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive patterns are added to the input sensor, then touch detection capability is improved, but emission efficiency and external light reflectance are affected, reducing visibility
Solution Approach 1:
The patent applies local quality by creating mesh patterns with different widths in different regions. The first mesh pattern has a first width while the second mesh pattern has a second width that is greater than the first width. This local variation in mesh width allows optimization of both touch detection capability and light reflectance in different areas of the display device, resolving the contradiction between these two requirements.
2Ease of manufacture
If mesh patterns with uniform width are used, then manufacturing is simplified, but visibility is not optimized due to inability to prevent voltage drop
Solution Approach 1:
The patent implements local quality by varying the mesh width across different regions. The second mesh pattern has a greater width than the first mesh pattern, which helps prevent voltage drop and improve visibility in specific areas while maintaining manufacturability through a systematic approach to pattern design.
Solution Approach 2:
The patent applies parameter changes by modifying the mesh width parameter across different regions. Specifically, the second mesh pattern has a greater width than the first mesh pattern, and the third mesh pattern has a width that is less than the second mesh pattern. This systematic parameter variation optimizes visibility and voltage drop prevention while maintaining manufacturing feasibility.
3Illumination intensity
If the second mesh pattern has a greater width to cover the connection area, then visibility is improved by preventing voltage drop, but the overall device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the conductive pattern into multiple mesh patterns (first mesh pattern, second mesh pattern, and third mesh pattern) with different widths and positions. This segmentation allows each region to be optimized independently - the second mesh pattern with greater width covers the connection area to prevent voltage drop, while other regions maintain appropriate complexity levels.
Solution Approach 2:
The patent implements local quality by creating different mesh pattern characteristics in different regions. The second mesh pattern has a greater width specifically to cover the connection area and prevent voltage drop, while the first and third mesh patterns have different widths optimized for their respective locations. This localized optimization improves visibility without unnecessarily increasing overall device complexity.
Data Source
Figure 1~2
Figure 3
Figure 4A
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.