Electro-optical Device Mirror Wobbling Suppression
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Solution Overview
Problem
Existing electro-optical devices with digital micromirror devices suffer from mirror wobbling during posture switching, leading to light leakage and reduced contrast due to limited degree of freedom in adjusting conditions.
Innovation Solution
The electro-optical device employs multiple address electrodes with different distances from the axis, allowing independent control of voltages and timing to optimize electrostatic forces, thereby stabilizing mirror posture and reducing wobbling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single address electrode is used to pivot the mirror, then the structure is simple, but the mirror wobbles during posture switching causing light leakage and reduced contrast
Solution Approach 1:
The address electrode is segmented into multiple independent address electrodes (first address electrode and second address electrode) positioned at different distances from the pivot axis. This segmentation allows independent voltage control of each electrode, enabling precise manipulation of electrostatic forces to eliminate mirror wobbling during posture transitions while maintaining structural simplicity.
Solution Approach 2:
Different regions of the address electrode system are assigned different electrical properties by positioning electrodes at specific distances from the pivot axis. The first address electrode is positioned closer to the axis while the second is positioned farther away, creating localized electrostatic field distributions that collectively stabilize the mirror during switching without requiring complex overall restructuring.
2Reliability
If multiple address electrodes are added to suppress wobbling, then mirror posture stability improves, but the device complexity increases
Solution Approach 1:
The address electrode is segmented into multiple independent address electrodes (first address electrode and second address electrode) positioned at different distances from the pivot axis. This segmentation allows independent voltage control of each electrode, enabling precise manipulation of electrostatic forces to eliminate mirror wobbling during posture transitions while maintaining structural simplicity.
Solution Approach 2:
The multiple address electrodes serve multiple functions simultaneously: they generate the primary electrostatic force for mirror pivoting, provide differential force control to suppress wobbling, and enable independent voltage timing control for optimized switching performance. This multi-functionality achieves enhanced stability without proportionally increasing device complexity.
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 approach effectively suppresses mirror wobbling, enhancing the stability of mirror posture switching and minimizing light leakage, thereby improving contrast and performance in projection-type display devices.
Implementation Method 1
supplying an electrostatic force between the address electrode and the mirror to pivot about the axis
Implementation Method 2
supplying a bias voltage to the mirror via the torsion hinge
Data Source
AI summary
An electro-optical device includes a mirror being positioned above a surface of a substrate and modulating light, a torsion hinge being positioned between the mirror and the substrate, and supporting the mirror via a mirror support post such that the mirror is pivotable about an axis, and address electrodes being positioned between the mirror and the substrate, and supplying electrostatic forces between the address electrodes and the mirror. Each of the address electrodes includes a first address electrode that is positioned on a side of the axis in plan view, and a second address electrode that is positioned on the opposite side of the axis with respect to the first address electrode in plan view. The first address electrode and the second address electrode are driven independently of each other.