Touch Sensor Electrode Stack for Low-Reflection Display Visibility
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Solution Overview
Problem
Existing touch panels in electronic devices face issues with external light reflection affecting visibility and increasing power consumption when brightness is increased to mitigate this effect.
Innovation Solution
A touch sensor and display device design featuring a multi-layer conductive pattern structure with alternating sub-metal layers of different widths and materials, including carbon nano tubes or titanium for the first metal layer and aluminum or copper for the second, to reduce external light reflection and maintain visibility without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the display panel is increased to reduce influence of external light, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent converts the harmful effect of external light reflection into a beneficial structure by designing a multi-layer conductive pattern with alternating metal layers (first metal layer with higher reflectivity, second metal layer with lower reflectivity) that actively manages light reflection. This structure reduces side external light reflection while maintaining display visibility, thereby eliminating the need to increase power consumption to compensate for reflection issues.
Solution Approach 2:
The patent employs composite material structure in the conductive pattern by alternating different metal materials with different reflectivity properties. The first metal layer (higher reflectivity) and second metal layer (lower reflectivity) work together in a composite configuration to optimize both optical performance and electrical conductivity, reducing the need for increased brightness and associated power consumption.
2Illumination intensity
If a multi-layer conductive pattern structure is implemented to reduce external light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent segments the conductive pattern into multiple alternating metal layers (first metal layer and second metal layer) with different reflectivity characteristics. This segmentation allows each layer to perform a specific optical function, collectively reducing side external light reflection while maintaining a systematic and manufacturable structure through repetitive layering.
Solution Approach 2:
The patent transitions from a conventional single-layer or simple multi-layer conductive structure to a vertically stacked multi-layer configuration with alternating materials. This dimensional approach (adding vertical layering) enables optical control in the vertical dimension while maintaining planar connectivity, effectively managing light reflection without excessive horizontal complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-layer conductive pattern effectively reduces external light reflection, enhancing visibility while minimizing power consumption by optimizing the reflectivity and width distribution of metal layers.
Implementation Method 1
When external light (or light incident from the outside) reaches a surface of a touch panel, light reflection may occur
Data Source
AI summary
A display device may include a display panel having a plurality of pixels therein, a first conductive pattern on the display panel, a touch insulating layer covering at least a portion of the first conductive pattern, a second conductive pattern on the touch insulating layer, and an organic insulating layer. The second conductive pattern may include a first metal layer and a second metal layer. The first metal layer may include a plurality of sub-metal layers, and the second metal layer may include a plurality of sub-metal layers. A first sub-metal layer of the first metal layer may be stacked on a first sub-metal layer of the second metal layer, and a width of the first sub-metal layer of the first metal layer may be wider than a width of the first sub-metal layer of the second metal layer.