Multi-state Interferometric Modulator with Variable Restoring Force
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Solution Overview
Problem
Interferometric modulators (IMODs) have a limited stable range of motion, which restricts the range of colors that can be reliably produced, as the movable reflector can only move within a small distance before transitioning to a fully closed position, limiting color output.
Innovation Solution
The implementation of a deformable element with a restoring force modifier that increases the restoring force when the movable reflector is in contact with it, allowing for a larger stable range of motion by changing the spring constant as the reflector moves, enabling the production of a wider range of colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional deformable element is used without a restoring force modifier, then the structure is simple, but the stable range of motion is limited
Solution Approach 1:
The restoring force mechanism is segmented into two distinct components: the deformable element and the restoring force modifier. This segmentation allows each component to have a specialized function - the deformable element provides baseline elasticity while the restoring force modifier extends the stable range of motion through geometric design, resolving the contradiction between simplicity and extended range
Solution Approach 2:
The restoring force modifier introduces a geometric dimension to the restoring force mechanism. By designing the modifier with specific geometric features (such as inclined surfaces or lever arms), the system transforms a simple linear spring into a mechanism that can maintain stability over a larger displacement range through spatial configuration
2Adaptability or versatility
If the stable range of motion is extended using a restoring force modifier, then more colors can be produced, but the device complexity increases
Solution Approach 1:
The restoring force modifier serves multiple functions simultaneously: it extends the stable range of motion, maintains restoring force across the extended range, and enables broader color output through the interferometric effect. This multi-functionality allows the additional geometric component to justify its complexity by delivering multiple performance benefits
3Length of moving object
If the movable reflector is allowed to move a larger distance, then the optical interference range increases, but the restoring force becomes insufficient
Solution Approach 1:
The restoring force modifier acts as an intermediary between the deformable element and the movable reflector. It transmits and transforms the restoring force from the deformable element, maintaining adequate force levels even when the reflector displacement exceeds the natural range of the deformable element alone
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 solution extends the stable range of motion for the movable reflector, allowing for the production of a broader spectrum of colors and improving the fill factor and image quality of the display.
Implementation Method 1
The deformable element can be capable of providing a restoring force to bias the movable reflector to a first position
Implementation Method 2
an IMOD display element may include a pair of conductive plates, one or both of which may be transparent and/or reflective, wholly or in part, and capable of relative motion upon application of an appropriate electrical signal. The position of one plate in relation to another can change the optical interference of light incident on the IMOD display element
Data Source
AI summary
This disclosure provides systems, methods and apparatus relating to electromechanical display devices. In one aspect, a multi-stage interferometric modulator (IMOD) can include a movable reflector that can be moved to different positions to produce different reflected colors. The IMOD can include deformable elements that are coupled to a back side of the movable reflector and provide support to the movable reflector. The deformable elements can provide a restoring force that biases the movable reflector to a resting position. The IMOD can include one or more restoring force modifiers that are configured to increase the restoring force when engaged. The restoring force modifiers can be between the movable reflector and the deformable elements such that the deformable elements contact the restoring force modifiers when the movable reflector is displaced to a contacting position.