See-through Dimming Panel with Dual Electric Field Control
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Solution Overview
Problem
Smart glass technologies, such as SPD and LC types, face limitations in response time and transmittance range, particularly in transitioning from transparent to opaque states, which affects their efficiency in dynamic light control applications.
Innovation Solution
A see-through dimming panel is designed with a suspended-particle-device (SPD) layer sandwiched between transparent substrate and conductor layers, utilizing a longitudinal electric field for alignment and a transverse electric field for microscopic heating to control transmittance, along with circuitry to adjust electric potential differences for rapid and controlled transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SPD-type smart glass is used to achieve a wide transmittance dynamic range (1% to 80%), then the transmittance range is improved, but the response time when switching from transparent to opaque state deteriorates (becomes slow)
Solution Approach 1:
The patent divides the control function into two separate electrode pairs: one electrode pair controls the longitudinal electric field for transmittance level, while another electrode pair controls the transverse electric field for transition speed. This segmentation allows independent optimization of both transmittance range and response time without mutual interference.
Solution Approach 2:
The patent introduces a transverse electric field (perpendicular to the longitudinal electric field) to control particle transition speed. By adding this another dimension of control, the system can independently adjust transition speed without affecting the transmittance dynamic range controlled by the longitudinal field.
2Speed
If liquid crystal (LC) type smart glass is used to achieve fast response time in both directions, then the response time is improved, but the transmittance dynamic range deteriorates (reduced to 1% to 50%)
Solution Approach 1:
The patent uses a composite structure combining suspended particles in a liquid medium between transparent substrates, controlled by both longitudinal and transverse electric fields. This composite approach achieves the fast response of LC technology while maintaining the wide transmittance range of SPD technology.
Solution Approach 2:
The dual electrode pair system provides multi-functionality: the first electrode pair universally controls transmittance level across the full dynamic range, while the second electrode pair universally controls transition speed in both directions, making the system adaptable to various operational requirements.
3Ease of operation
If electric potential difference is applied between first and second electrodes to control transmittance level, then the transmittance control is improved, but the transition speed from transparent to opaque deteriorates
Solution Approach 1:
The control function is segmented into two independent electrode pairs: electrodes 1-2 control transmittance level through longitudinal electric field, while electrodes 3-4 control transition speed through transverse electric field. This segmentation resolves the contradiction by allowing each function to be optimized independently.
Solution Approach 2:
The transverse electric field acts as an intermediary mechanism that accelerates particle transition without directly controlling the final transmittance level. This intermediary field enables fast transitions while the longitudinal field maintains precise transmittance control.
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
This configuration significantly reduces the transition time from transparent to opaque states, achieving a 10× reduction to about 1-2 seconds, while maintaining uniform light intensity across the field of view in applications like mixed reality head-mounted displays.
Implementation Method 1
An electric potential difference applied between the first and second electrodes results in a longitudinal electric field that causes suspended particles in the SPD layer to align
Implementation Method 2
An electric potential difference applied between the second and third electrodes results in a transverse electric field that causes microscopic heating of the SPD layer
Implementation Method 3
which increases Brownian motion of the suspended particles in the SPD layer
Data Source
AI summary
A see-through dimming panel includes first and second transparent substrate layers and suspended-particle-device (SPD) layer therebetween. A first transparent conductor layer is between the first transparent substrate layer and the SPD layer, and a second transparent conductor layer is between the second transparent substrate layer and the SPD layer. A first electrode is electrically coupled to the first transparent conductor layer. Second and third electrodes are electrically coupled to opposite ends of the second transparent conductor layer. An electric potential difference applied between the first and second electrodes controls a transmittance level of the SPD layer. An electric potential difference applied between the second and third electrodes, which results in a transverse electric field, controls a speed at which the transmittance level of the SPD layer decreases when the electric potential difference applied between the first and second electrodes controls is decreased.