LCoS Spatial Light Modulator Frame Rate Optimization
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Solution Overview
Problem
Temporal fluctuations in light modulation occur in liquid crystal on silicon (LCoS) spatial light modulators, particularly when using AC signals, charge leakage, and impurities, which are not adequately addressed by existing methods for increasing frame rate or reducing power consumption, limiting their performance in measurement applications.
Innovation Solution
An LCoS spatial light modulator with a pixel diode array, signal generating circuit, and display area selection circuit that allows for dynamic partial driving and higher frame rates by optimizing shift signal periods and reset signals to reduce temporal modulation fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate is increased by shortening the frame time, then temporal modulation fluctuations are reduced, but the charge accumulation time for each pixel must be reduced which is limited by circuit structure
Solution Approach 1:
The patent divides the modulation area into multiple divided modulation areas separated by borderlines. By segmenting the display area and processing pixels in parallel across multiple divided areas, the system can reduce the charge accumulation time per pixel while maintaining the overall frame rate. This segmentation allows the frame time to be distributed across multiple smaller processing regions.
Solution Approach 2:
The patent implements partial driving where only selected divided modulation areas are actively driven during each frame period. By selectively activating specific regions rather than the entire modulation area, the system reduces the total charge accumulation time required while maintaining acceptable image quality through strategic selection of which areas to update.
2Speed
If the number of signal lines is increased to increase frame rate, then temporal fluctuations are reduced, but the circuit structure limits the number of connectable signal lines
Solution Approach 1:
The patent introduces a spatial dimension by dividing the modulation area into multiple divided modulation areas with borderlines. This spatial segmentation allows parallel processing of pixel data across different regions, effectively increasing the data throughput without requiring a proportional increase in signal lines. The borderlines create distinct processing zones that can be addressed independently.
Solution Approach 2:
By segmenting the modulation area into divided modulation areas, the patent enables parallel data input to multiple regions simultaneously. This segmentation strategy increases the effective data processing capacity without linearly increasing the number of signal lines, as multiple regions can share common signal line infrastructure while being processed in parallel.
3Use of energy by moving object
If partial driving is implemented to reduce power consumption, then energy efficiency is improved, but frame rate cannot be increased and temporal fluctuations persist
Solution Approach 1:
The patent implements partial driving by selectively activating only certain divided modulation areas during each frame period. This approach reduces power consumption compared to full-screen driving while simultaneously enabling higher frame rates by concentrating processing resources on active regions. The borderlines define which areas are actively driven versus which are in standby, optimizing the balance between power usage and frame rate.
4Use of energy by moving object
If simple matrix type driving is used to reduce power consumption, then energy efficiency is improved, but cross talk occurs and image quality deteriorates
Solution Approach 1:
The patent divides the modulation area into divided modulation areas separated by borderlines, creating distinct processing zones. This segmentation prevents cross-talk between adjacent regions by establishing clear boundaries, thereby maintaining image quality while still enabling power-saving partial driving modes. Each divided area can be independently controlled without interfering with neighboring regions.
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
The solution achieves a higher frame rate and improved image quality by reducing temporal modulation fluctuations, enabling better performance in measurement applications without increasing power consumption or complex circuitry.
Implementation Method 1
When a voltage is applied to a pixel electrode, liquid crystal molecules in the LCoS rotate into an orientation orthogonal to the substrate, modifying the phase modulation amount of incident light
Implementation Method 2
one frame time is defined as the product of the charge accumulation time required for one pixel to accumulate charge and the number of pixels
Data Source
AI summary
The display area selection circuit selects a desired display area. The signal generating circuit sets a period of each shift signal generated while the selection position of the pixel diode is between the shift start position and the display start position shorter than a period of each shift signal generated while the selection position of the pixel diode is between the display start position and the display end position.