SPD Light Valve Display for Artifact Light Degradation Control
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Solution Overview
Problem
Existing technologies fail to effectively protect valuable objects from degradation by visible light, as they either require UV exposure to function, take too long to change states, or are impractical due to size and power requirements, not meeting criteria for efficient light blocking and transmission control.
Innovation Solution
Suspended particle device (SPD) light valves with laminated films and antireflection coatings, which can rapidly change between dark and clear states, block UV and IR radiation, and are powered only when needed, allowing for controlled visible light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If photochromic or thermochromic materials are used to block visible light, then light blocking capability is improved, but response time is too slow (minutes to hours)
Solution Approach 1:
The patent changes the fundamental parameter of light blocking mechanism from chemical reactions (photochromic/thermochromic) to electrostatic particle alignment. By applying voltage to control the orientation of suspended particles, the system achieves rapid state changes (seconds) while maintaining effective visible light blocking capability.
Solution Approach 2:
The patent replaces slow chemical/thermal mechanisms with an electrical field-based mechanism. The suspended particles respond instantly to electrical fields, enabling rapid transition between transparent and opaque states without relying on slow chemical reactions or thermal diffusion processes.
2Object-affected harmful factors
If electrochromic windows are used to control light transmission, then light blocking capability is improved, but device size and power requirements become impractical
Solution Approach 1:
The patent uses thin film structures with suspended particles that can be integrated into window panes or display devices. This thin-film approach dramatically reduces device size and material requirements compared to bulk electrochromic windows, while maintaining effective light control functionality.
Solution Approach 2:
The suspended particle device maintains its state without continuous power input. Once particles are aligned by an electrical field, they remain in position without requiring sustained power, enabling the device to be powered only during state transitions rather than continuously.
3Illumination intensity
If clear display cases are used to protect articles, then visibility is improved, but light degradation protection is insufficient
Solution Approach 1:
The patent transforms the static clear window into a dynamic light control device. The suspended particle device can dynamically adjust its transparency state based on viewing needs, providing full visibility when required and complete light blocking when protection is prioritized, thereby resolving the static contradiction between visibility and protection.
Solution Approach 2:
The suspended particle device serves multiple functions: it acts as a clear window for visibility, a light blocking shield for protection, and a controllable intermediary state for partial transmission. This multi-functionality allows a single device to replace both clear display cases and UV filters, providing both visibility and degradation protection.
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
SPD light valves provide efficient protection from visible light degradation, maintaining a dark state without power, achieving rapid state changes and high visible light transmission, thus preserving artifacts while allowing for comfortable viewing and minimizing damage.
Implementation Method 1
a suspended particle device, commonly referred to herein as a suspended particle device, a SPD light valve, or simply an SPD
Implementation Method 2
The SPD light valves according to the present invention are used or intended for use as windows capable of varying the transmission of light passing therethrough
Implementation Method 3
By using low-iron or iron-free glass or clear plastic for the window material and by including anti-reflection coatings on one or both air-window surfaces
Implementation Method 4
By using low-iron or iron-free glass or clear plastic for the window material and by including anti-reflection coatings on one or both air-window surfaces, ranges of 3.5% to 72% and 0.5% to 51.3% have been achieved
Data Source
AI summary
A display device comprising a Suspended Particle Device film or other material for controlling the amount of illumination transmitted to an object from one or more light sources to protect the object from degradation by light is described. The display is capable of being dark when the object is not being viewed and being highly transmissive when the object is to be viewed. If desired, the display device may be controlled so as to provide a substantially constant amount of illumination when the object is viewed or intended to be viewed. A method of protecting an object using the display device is also provided.