Input Sensing Unit Floating Patterns to Reduce Electrode Reflection
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Solution Overview
Problem
External light reflection from electrode patterns in input sensing units affects the visibility of active regions in electronic apparatuses, such as touch screens, leading to reduced visibility and potential interference with image quality.
Innovation Solution
The input sensing unit incorporates a floating pattern overlapped with connection patterns to reduce light reflection, ensuring uniform visibility by spacing and electrically disconnecting sensor patterns, and using floating patterns to minimize parasitic capacitance and visibility differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode patterns are used in the input sensing unit, then sensing function is enabled, but light reflection occurs reducing visibility
Solution Approach 1:
The patent introduces a floating pattern disposed on a different layer (e.g., upper or lower layer) relative to the electrode patterns. This dimensional separation allows the floating pattern to overlap with electrode patterns in plan view while being physically spaced apart in the vertical dimension, enabling light reflection reduction without compromising sensing functionality.
Solution Approach 2:
The floating pattern acts as an intermediary element between the electrode patterns and the external environment. It overlaps with the electrode patterns to intercept and reduce light reflection, while its electrical disconnection from other conductive patterns ensures it does not interfere with the sensing function, thus mediating between visibility improvement and sensing reliability.
2Device complexity
If sensor patterns are placed close to connection patterns, then device complexity is reduced, but visibility uniformity deteriorates
Solution Approach 1:
The floating pattern is disposed on a different layer than the electrode patterns, creating vertical separation. This allows the patterns to be close in plan view (reducing horizontal space and complexity) while maintaining visibility uniformity through the floating pattern's light reflection reduction effect at the overlapping region.
Solution Approach 2:
The floating pattern is strategically positioned to overlap specifically with connection patterns or electrode patterns where light reflection is most problematic. This localized approach improves visibility uniformity at critical regions without requiring uniform spacing across the entire sensing unit, thus balancing complexity and visibility.
3Illumination intensity
If floating pattern is added to reduce light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The floating pattern is designed to perform multiple functions: it reduces light reflection from electrode patterns, maintains electrical isolation to prevent interference, and can be integrated into existing multi-layer sensing structures. This multi-functionality justifies the additional structural element by providing comprehensive benefits across multiple performance aspects.
Solution Approach 2:
The floating pattern is implemented as a thin conductive layer or film that can be deposited on existing layers. This thin-film approach minimizes the additional volume and material complexity while achieving the light reflection reduction effect, making the complexity increase manageable.
4Illumination intensity
If floating pattern overlaps with connection pattern, then light reflection is reduced, but electrical interference may occur
Solution Approach 1:
The floating pattern overlaps with connection patterns in plan view but is disposed on a different layer, creating vertical separation. This dimensional arrangement allows optical overlap for light reflection reduction while physical separation prevents electrical contact and potential interference, resolving the contradiction between visibility improvement and electrical safety.
Solution Approach 2:
The floating pattern serves as an intermediary that optically interacts with the connection patterns (overlapping to reduce reflection) while electrically isolating from them (through layer separation and disconnection). This mediates between the optical benefit of overlap and the electrical safety of separation.
Data Source
AI summary
An input sensor includes: a first sensing electrode including first sensing patterns and a first pattern disposed between the first sensing patterns; a second sensing electrode disposed on the same layer as the first sensing patterns; and a floating pattern including a plurality of segments each overlapping the first pattern and insulated from the second sensing electrode, wherein at least one of the plurality of segments is surrounded by a portion overlapping the first pattern among the second sensing electrode.