DMD Micromirror Refresh Control for Automotive Lamp Hinge Memory
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Solution Overview
Problem
Digital Micromirror Devices (DMDs) in automotive lamps face issues with hinge memory due to prolonged on or off states, leading to image quality degradation and startup delays, exacerbated by high temperatures near semiconductor light sources.
Innovation Solution
Implementing a refresh operation that repeatedly switches micromirrors between on and off states during the enable period when illumination light is turned off, using pulse width modulation (PWM) control to prevent hinge sticking and execute the refresh operation during initialization, shutdown, or when temperature exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the DMD is supplied with power to be set to the enable state in advance to reduce startup delay, then the startup response time is improved, but hinge memory occurs due to micromirrors being fixedly set to the turn-off side
Solution Approach 1:
The patent applies periodic action by implementing a refresh operation that cyclically switches micromirrors between on and off states during the enable period. This periodic switching prevents the hinges from remaining in a fixed position, thereby eliminating hinge memory while maintaining the DMD in the enable state for quick startup response.
Solution Approach 2:
The patent applies preliminary action by performing the refresh operation during the enable period before actual image display begins. This preliminary switching action prepares the micromirrors to avoid hinge memory formation, ensuring both quick startup and reliable operation without requiring power-off periods.
2Stability of the object's composition
If micromirrors are continuously set to on state or off state for prolonged periods, then the light distribution pattern is maintained, but hinge memory occurs leading to image quality degradation
Solution Approach 1:
The patent implements periodic switching of micromirrors during the enable period through refresh operations. This periodic action maintains hinge flexibility by preventing prolonged static positioning, while the overall light distribution pattern remains stable through controlled switching sequences that occur during intervals when illumination is off or during frame periods.
Solution Approach 2:
The patent maintains continuous useful action by keeping the DMD in the enable state with continuous power supply, performing refresh operations without transitioning to power-off state. This ensures the DMD remains ready for immediate image display while the refresh operations subtly maintain hinge health through periodic micromirror switching.
3Device complexity
If the DMD operates at high temperature near semiconductor light sources, then the automotive lamp achieves compact design, but hinge memory occurs more readily causing image quality degradation
Solution Approach 1:
The patent applies periodic action by implementing refresh operations that cyclically switch micromirrors during the enable period. This periodic switching counteracts the increased hinge memory tendency caused by high temperature operation, maintaining hinge flexibility and preventing image quality degradation despite the compact high-temperature environment.
4Reliability
If micromirrors are switched frequently between on and off states, then hinge memory is suppressed, but image quality may degrade due to excessive switching
Solution Approach 1:
The patent implements periodic switching at a controlled frequency during the enable period, balancing hinge memory suppression with image quality maintenance. The refresh operations occur at intervals that prevent hinge stiffening while minimizing disruption to the displayed image, typically synchronized with frame rates or illumination off-periods.
Solution Approach 2:
The patent applies partial action by performing refresh operations only during specific periods (enable state with illumination off, or during frame intervals) rather than continuous switching. This partial refreshing is sufficient to prevent hinge memory while avoiding excessive switching that would degrade image quality, achieving the optimal balance.
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 effectively suppresses hinge memory, preventing image quality degradation and reducing startup delays by ensuring micromirrors are set to the flat state, while avoiding conflicts with turn-on instructions and temperature-induced issues.
Implementation Method 1
a patterning device including a digital micromirror device (DMD) structured to spatially modulate and reflect the illumination light according to a pattern signal
Implementation Method 2
By switching the tilting angle of each micromirror 104, such an arrangement allows light to be turned on and off for each pixel
Data Source
AI summary
An illumination apparatus generates illumination light. A patterning device includes a digital micromirror device (DMD) configured to spatially modulate and reflect the illumination light according to a pattern signal. A DMD controller generates the pattern signal. The DMD controller generates a refresh pattern signal for repeatedly turning on and off micromirrors in a period in which the DMD is set to the enable state and the illumination light is turned off.