Redundant Projected Capacitive Touch Panel for Aviation
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Solution Overview
Problem
Existing electronic touch panel displays lack redundancy and EMC endurance, making them unsuitable for applications requiring reliability under extreme conditions and high ambient visibility, such as commercial aviation and military settings where failure could have severe consequences.
Innovation Solution
A sealed electronic display with a projected capacitance touch panel featuring redundant sensors and input/output devices, multiple layers for high solar loading resistance, and shielding to mitigate electromagnetic interference, ensuring continued operability even under partial failure and harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant sensors and input/output devices are added to ensure continued performance under partial failure, then reliability is improved, but device complexity increases
Solution Approach 1:
The display is divided into multiple independent grid sections (first grid section and second grid section), each with its own touch sensors and input/output devices. This segmentation allows the display to continue operating with a subset of sections if others fail, achieving redundancy without requiring a complete backup system.
Solution Approach 2:
The patent implements partial redundancy by providing backup touch sensors and input/output devices for each grid section, rather than requiring full system redundancy. This allows the display to maintain functionality with reduced capacity rather than complete failure, balancing reliability improvements with acceptable complexity increases.
2Illumination intensity
If multiple layers are added to withstand high solar loading and maintain visibility in bright ambient conditions, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent employs multiple specialized layers including a first polarizer, a liquid crystal layer, a second polarizer, and anti-reflective coatings. These composite layers work together to maintain display visibility under high solar loading and bright ambient conditions, with each layer contributing specific optical properties to achieve the overall visibility requirement.
3Object-affected harmful factors
If shielding is added between layers and in channels to limit EMI and improve EMC, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent introduces shielding layers as intermediary elements between the touch panel layers and display layers, and within communication channels. These shielding layers act as mediators that block electromagnetic interference while allowing the display to function, integrating EMI protection into the existing structure rather than adding separate external shielding systems.
4Reliability
If a sealed gasket is added to prevent compromise by harsh environmental conditions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs a sealed gasket structure that creates a protective barrier between the touch panel and the external environment. This sealed enclosure protects internal components from harsh environmental conditions including moisture, dust, and temperature extremes, while maintaining a relatively thin and integrated profile that doesn't significantly increase overall device complexity.
Data Source
AI summary
An electronic display assembly includes a display layer for displaying an image, a projected capacitive touch panel with touch input areas, each of which are independently operable and configured to receive touch input from a user. Input/output devices are electrically connected with the display layer touch panel. Software instructions, when executed, configure one or more processors to automatically begin utilizing a remaining operable input/output device if one of said input/output devices is rendered inoperable.