Micromirror Hinge Memory Mitigation via Thermal Relaxation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microdisplay systems, particularly those using digital micromirror devices, suffer from hinge memory issues that can lead to catastrophic failure due to prolonged use in specific image states, such as all black or all white, causing micromirrors to predominantly stay in one position and resulting in mechanical stress and potential failure.
Innovation Solution
A method and system that involves subjecting the micromirrors to a temperature equal to or greater than the average operational temperature during the parked state, either during a power down cycle or when not in use, to reduce or eliminate hinge memory by utilizing a torsional element and control electronics to manage the temperature and mitigate the mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the micromirror is operated predominantly in one position (ON or OFF) for extended periods, then the display can show specific image states (e.g., all black or all white), but hinge memory accumulates causing catastrophic failure
Solution Approach 1:
The system performs preliminary action by detecting when a micromirror has been in the same state for a predetermined period and proactively switching it to the opposite state before hinge memory can cause catastrophic failure. This preventive switching resolves the contradiction by maintaining reliability while allowing extended operation in specific image states.
2Reliability
If the micromirror is switched frequently between ON and OFF states, then hinge memory is reduced, but the ability to display stable image states is compromised
Solution Approach 1:
The system uses a timer to track how long each micromirror has been in its current state and switches it proactively before hinge memory becomes problematic. This allows the micromirror to remain in a stable position for an optimized duration while still preventing catastrophic failure, resolving the contradiction between reliability and duration.
3Reliability
If a predetermined number of switches are implemented to mitigate hinge memory, then reliability is improved, but additional control complexity is introduced
Solution Approach 1:
The system employs a timer and counter mechanism that automatically tracks micromirror state duration and triggers switching when thresholds are reached, without requiring complex external control. This self-service approach improves reliability while minimizing additional control complexity by using simple timing and counting logic.
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 reduces hinge memory, potentially eliminating it, thereby extending the product life of microdisplay systems with minimal electricity consumption and no need for extended downtime, as significant reductions can be achieved with short temperature applications above the operational range.
Implementation Method 1
subjecting the torsional element having the hinge memory to a temperature equal to or greater than the average operational temperature for an amount of time while the torsional element is in a parked state
Data Source
AI summary
Provided are a system and method for reducing failures due to hinge memory. The method, in one embodiment, includes providing a torsional element having an amount of hinge memory, wherein the hinge memory is at least partially created using an average operational temperature. The method, in this embodiment, further includes subjecting the torsional element having the hinge memory to a temperature equal to or greater than the average operational temperature while the torsional element is in a parked state for an amount of time to reduce the amount of the hinge memory.