Multi-layer Display Air Gap Porous Membrane Pressure Balance
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Solution Overview
Problem
Multi-layer display systems are susceptible to interference and damage due to temperature and pressure variations, which can cause dust ingress and lead to moiré interference, mura, and irreversible damage, especially in environments like automotive settings.
Innovation Solution
A multi-layer display system with a stacked arrangement of display screens and an air gap between them, featuring an opening for airflow and a porous membrane that allows air exchange while preventing dust and water ingress, maintaining pressure equilibrium and reducing thermal shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the display screens are sealed to prevent dust ingress, then dust protection is improved, but temperature and pressure variations cause mechanical stress and damage
Solution Approach 1:
The patent employs a porous membrane material that allows air to pass through while blocking dust particles. The membrane's porous structure enables pressure equalization between the display enclosure and external environment, preventing mechanical stress from temperature and pressure variations, while simultaneously providing dust protection through the membrane's filtering capability.
Solution Approach 2:
The porous membrane acts as an intermediary element between the display screens and the external environment. It mediates the interaction by allowing beneficial air flow for pressure balance while blocking harmful dust particles, thus resolving the contradiction between sealing for protection and venting for pressure equalization.
2Stress or pressure
If an opening is provided for air flow to balance pressure, then pressure equilibrium is improved, but dust and water can ingress into the display
Solution Approach 1:
The patent utilizes a porous membrane with controlled pore sizes that permit air molecules to pass through for pressure equalization while being small enough to block dust particles and water droplets. This selective permeability resolves the contradiction by allowing pressure balance without compromising protection from harmful contaminants.
Solution Approach 2:
The porous membrane serves as an intermediary that enables air flow for pressure equilibrium while simultaneously acting as a barrier against dust and water. It mediates between the need for pressure balance and the need for protection, allowing beneficial gas exchange while blocking harmful particles.
3Object-affected harmful factors
If the membrane is made non-porous to block dust, then dust protection is improved, but air cannot flow to balance pressure
Solution Approach 1:
The patent applies a porous membrane with optimized pore structure that distinguishes between different sized particles. The pores are sized to allow air molecules to pass through freely for pressure equalization while being sufficiently small to block dust particles, achieving both air flow and dust protection simultaneously.
Solution Approach 2:
The membrane exhibits different permeability properties for different substances based on their size and nature. It has local quality in terms of selective permeability - allowing gases like air to pass through while blocking larger particles like dust and water droplets, thus resolving the contradiction between sealing and venting.
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 system effectively reduces the impact of temperature and pressure variations, preventing dust ingress and maintaining image quality by allowing air to flow and balancing pressure, thus minimizing the risk of mura and mechanical stress on the display components.
Implementation Method 1
a membrane covering the opening, the membrane being porous to air and non-porous to small particulates and water
Data Source
AI summary
A multi-layer display (MLD) system may include a plurality of display screens including at least first and second display screens arranged in a substantially parallel and overlapping manner, such that an air gap exists between the first display screen and the second display screen. An opening in the enclosure may exist such that air can flow through the opening between the air gap and outside of the enclosure, and a membrane covering the opening, the membrane being porous to air and non-porous to small particulates and water.