Off-State Light Recycling in Spatial Light Modulators
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Solution Overview
Problem
Current display systems employing spatial light modulators waste OFF-state light, reducing optical efficiency and resulting in lower image contrast and brightness, as they discard this light rather than recycling it.
Innovation Solution
Implementing an off-state light recycling mechanism that captures and reroutes OFF-state light back to the spatial light modulator, allowing it to be re-directed as ON-state light to enhance image brightness and efficiency, along with calibrating bitplanes to account for varying intensity due to recycled light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If OFF-state light is discarded to maintain simple system operation, then device complexity is reduced, but optical efficiency and image brightness deteriorate
Solution Approach 1:
The patent implements an off-state light recycling mechanism that captures discarded OFF-state light from the spatial light modulator and redirects it back through the system. This allows the previously wasted light energy to be recovered and reused, directly improving optical efficiency while accepting increased system complexity through additional optical components
Solution Approach 2:
The patent introduces a light recycling mechanism as an intermediary system between the spatial light modulator and the display target. This intermediary captures OFF-state light, redirects it through additional modulator passes, and integrates it with ON-state light, thereby recovering energy without disrupting the primary display function
2Illumination intensity
If OFF-state light is recycled to improve brightness, then image brightness increases, but system complexity increases
Solution Approach 1:
The recycling mechanism captures previously discarded OFF-state light and redirects it back through the spatial light modulator system, allowing this light to contribute to the final image brightness. This directly increases illumination intensity by recovering energy that would otherwise be lost
Solution Approach 2:
The patent employs bitplane calibration techniques where different bitplanes are displayed for calibrated time periods accounting for recycled light intensity variations. This periodic calibration approach manages the complexity of varying light intensities through temporal control rather than requiring complex real-time adjustment mechanisms
3Manufacturing precision
If bitplane calibration is implemented to account for recycled light intensity, then image quality is maintained, but processing time increases
Solution Approach 1:
The patent performs bitplane calibration in advance to determine the optimal display time periods for each bitplane. By pre-calculating these parameters based on the recycling efficiency and expected light intensity variations, the system avoids complex real-time adjustments while maintaining image quality
Solution Approach 2:
The patent adjusts the display time periods of different bitplanes as a function of the recycling efficiency parameter. By changing this temporal parameter based on pre-determined calibration data, the system compensates for recycled light intensity variations without requiring complex real-time processing
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 increases image brightness by up to 5 times, improves optical efficiency, and extends the lifespan of light sources by reducing power consumption and heat generation, while maintaining image quality.
Implementation Method 1
light incident to the pixels of the spatial light modulator is modulated by the pixels of the spatial light modulator. By setting the pixels at an ON state, the incident light is directed onto a screen so as to generate bright image pixels on the screen
Implementation Method 2
recycling the second portion of light back to the pixels of the spatial light modulator
Data Source
AI summary
In display systems employing spatial light modulators, the OFF-state light from OFF-state pixels of the spatial light modulator can be captured and directed back to the pixels of the spatial light modulator so as to recycle the OFF-state light in the display system. Bitplanes derived from the desired image to be produced are calibrated to include the recycled off-state light to properly produce the desired image using the display system.