Multilayer Input Sensor Structure for Display Quality
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Solution Overview
Problem
Existing electronic devices face challenges in achieving improved input sensor efficiency and display quality, particularly in devices with integrated input sensors and display panels.
Innovation Solution
The electronic device incorporates a multi-layered input sensor structure with specific conductive pattern layers and insulation layers, including silicon-based and organic materials, to enhance input sensing capabilities using capacitance and electromagnetic induction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple single-layer conductive pattern is used in the input sensor, then the device complexity is reduced, but the input sensor efficiency and display quality cannot be simultaneously improved
Solution Approach 1:
The conductive pattern is divided into multiple layers (first conductive pattern layer, second conductive pattern layer, third conductive pattern layer) separated by sensing insulation layers. Each layer performs specific sensing functions, allowing the system to achieve high input sensor efficiency through functional segmentation while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent transitions from a single-layer two-dimensional conductive pattern to a multi-layer three-dimensional structure. By adding the vertical dimension with multiple conductive pattern layers stacked at different heights (separated by insulation layers), the system achieves enhanced sensing capability and display quality without proportionally increasing planar complexity.
2Reliability
If multiple conductive pattern layers are added to enhance input sensing, then input sensor efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct sequential steps: forming the first conductive pattern layer, depositing the first sensing insulation layer, forming the second conductive pattern layer, depositing the second sensing insulation layer, and forming the third conductive pattern layer. This segmentation allows each layer to be optimized and fabricated independently using standard semiconductor processing techniques, reducing overall manufacturing complexity despite the multi-layer structure.
Solution Approach 2:
The patent employs different material parameters for different layers: the sensing insulation layers use materials with specific dielectric properties (first sensing insulation layer material, second sensing insulation layer material) to control electrical characteristics, while the conductive pattern layers use materials with appropriate conductivity. By carefully selecting and varying material parameters across layers, the system achieves high input sensor efficiency while maintaining compatibility with existing manufacturing processes.
3Reliability
If thick conductive pattern layers are used to improve sensing capability, then input sensor efficiency increases, but the display quality and light transmission are compromised
Solution Approach 1:
Instead of increasing the thickness of individual conductive pattern layers in the plane, the patent distributes the total conductive material across multiple vertical layers. Each conductive pattern layer can be kept thin (maintaining good light transmission) while the cumulative sensing capability is enhanced through the vertical stacking of multiple thin layers, thus resolving the contradiction between sensing efficiency and display quality.
Solution Approach 2:
Different regions of the conductive patterns have different local qualities: the sensing regions (first sensing patterns, second sensing patterns, third sensing patterns) are optimized for input detection, while the bridge regions (first bridge patterns, second bridge patterns, third bridge patterns) are optimized for electrical connection and voltage distribution. This local optimization allows each region to perform its function effectively without compromising overall light transmission or display quality.
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 solution provides enhanced input sensor efficiency and display quality by optimizing the input sensor's performance and integration with the display panel, enabling effective sensing of external inputs.
Implementation Method 1
the input sensor may sense an external input using a capacitance method
Implementation Method 2
the input sensor may sense an external input using an electromagnetic induction method
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
An electronic device includes: a display panel including pixels and an encapsulation layer covering the pixels; and an input sensor on the display panel, wherein the input sensor includes: a first sensing insulation layer directly on the encapsulation layer; a first conductive pattern layer on the first sensing insulation layer; a second sensing insulation layer on the first sensing insulation layer and covering the first conductive pattern layer; a second conductive pattern layer on the second sensing insulation layer; a third sensing insulation layer on the second sensing insulation layer and covering the second conductive pattern layer; a third conductive pattern layer on the third sensing insulation layer; and a fourth sensing insulation layer on the third sensing insulation layer and covering the third conductive pattern layer, and wherein the first conductive pattern layer and the second conductive pattern layer receive the same voltage.