Touch Sensor Electrode Layout With Dummy Patterns for Clear Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with input sensors face challenges in minimizing visibility of input components, which can detract from the aesthetic appeal and user experience.
Innovation Solution
The display device incorporates a design with a display panel featuring emission regions, non-emission regions, and an input sensor that includes insulation layers, sensing electrodes, and dummy patterns, where the sensing electrodes and dummy patterns overlap non-emission regions and define opening and cut regions to reduce visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If input sensor components are made visible on the display surface, then sensing function is achieved, but aesthetic appeal deteriorates due to visible input components
Solution Approach 1:
The dummy patterns are configured to have the same color as the surrounding emission regions, making the input sensor components visually blend with the display background. This color matching technique allows the sensing electrodes to maintain their functional visibility while becoming aesthetically invisible to users.
Solution Approach 2:
Dummy patterns are created as visual copies of the emission region characteristics (color, brightness, texture) and placed at strategic locations where sensing components would be visible. These copied visual features mask the underlying sensing electrodes, allowing the display surface to maintain uniform appearance while preserving touch sensing functionality.
2Measurement precision
If sensing electrodes are placed over emission regions, then sensing accuracy is improved, but visual quality deteriorates due to interference patterns
Solution Approach 1:
The sensing electrodes are segmented into multiple discrete sensing regions rather than continuous patterns. This segmentation allows light to pass through the gaps between sensing regions, reducing interference patterns while maintaining sufficient sensing coverage. The segmented structure enables both accurate touch detection and preserved display quality by creating optical pathways for light transmission.
Solution Approach 2:
Different regions of the display surface are assigned different qualities: emission regions maintain high brightness and color saturation for visual display, while non-emission regions contain the sensing electrodes with adjusted optical properties. The dummy patterns are selectively placed only in non-emission regions, allowing emission regions to maintain their full visual quality without compromise.
3Shape
If dummy patterns are added to mask sensing components, then aesthetic appeal is improved, but device complexity increases
Solution Approach 1:
The dummy patterns are merged with the existing display structure by using the same material layers and manufacturing processes as the emission regions. The dummy patterns share the same pixel structure, color filters, and electrode layers as the functional emission regions, eliminating the need for separate manufacturing steps and reducing overall device complexity despite the increased visual elements.
Data Source
AI summary
A display device includes a display panel including emission regions and a non-emission region adjacent to the emission regions; and an input sensor on the display panel, the input sensor including: a first sensing electrode: a second sensing electrode including a sensing pattern spaced from the first sensing electrode in a plan view; and dummy patterns spaced from the first sensing electrode and the sensing pattern of the second sensing electrode, wherein each of the first sensing electrode and the sensing pattern of the second sensing electrode includes line segments that overlap the non-emission region, the line segments defining opening regions that overlap corresponding emission regions of the emission regions, and wherein at least a portion of the dummy patterns overlaps boundary regions defined by a spacing region between the line segments of the first sensing electrode and the line segments of the sensing pattern.