Display Sensor Layer Patterning for Low-Reflectance Touch Detection
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Solution Overview
Problem
Display devices face challenges in maintaining good visibility in bright environments due to light reflectance issues, particularly in the design of sensing panels used for touch input detection.
Innovation Solution
The display device incorporates a sensor layer with conductive pattern layers arranged in a specific configuration, including non-overlapped and overlapped areas, and identification pattern portions to minimize light reflection, ensuring improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductive pattern layers are disposed on different layers in the sensor panel, then touch input detection capability is improved, but light reflectance increases causing visibility deterioration
Solution Approach 1:
The sensor panel is divided into multiple distinct layers including first and second conductive pattern layers disposed at different heights. This segmentation allows each layer to perform specific functions while reducing overall light reflectance through distributed structure. The cutting areas further segment the conductive patterns to minimize reflective surface continuity.
Solution Approach 2:
Different regions of the conductive pattern layers are designed with varying properties - some areas have overlapping patterns while others have non-overlapping patterns with cutting areas. This local variation optimizes both touch detection precision in overlapping regions and reduces light reflectance in non-overlapping regions with cuts.
2Reliability
If multiple conductive pattern layers are used for sensing, then sensing performance is improved, but device complexity increases
Solution Approach 1:
The first and second conductive pattern layers serve multiple functions simultaneously - they provide touch sensing capability through their overlapping regions while also acting as structural elements that define the sensor panel's mechanical properties. The cutting areas in these layers serve dual purposes of reducing reflectance and defining sensor electrode boundaries.
Solution Approach 2:
The sensor panel structure employs a nested layer configuration where the first conductive pattern layer and second conductive pattern layer are disposed at different heights within the same vertical space. This nesting approach allows multiple sensing functions to coexist without requiring separate dedicated spaces for each layer, thereby managing complexity.
3Ease of manufacture
If conductive pattern layers overlap completely, then manufacturing simplicity is maintained, but touch input position detection precision deteriorates
Solution Approach 1:
The first and second conductive pattern layers are deliberately designed with asymmetric positioning - they do not overlap completely but rather have partial overlapping regions combined with non-overlapping regions containing cutting areas. This asymmetric arrangement enhances touch position detection precision by creating distinct sensing zones while remaining manufacturable through standard alignment processes.
Data Source
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AI summary
A display device includes sub-pixel areas and a display layer including a light emitting element disposed in the sub-pixel areas, and an encapsulation layer disposed on the light emitting element. A sensor layer includes a sensor base layer and conductive pattern layers including first and second conductive pattern layers disposed on different layers from one another. The sensor layer includes an overlapped area where the first and second conductive pattern layers overlap each other, a non-overlapped area where either the first or second conductive patterns, but not both, is disposed, and a cutting area where the first and/or second conductive patterns is cut. The conductive pattern layers include a non-overlapped identification pattern portion disposed in the non-overlapped area, and an overlapped identification pattern portion disposed in the overlapped area.