Spatial Light Modulator Digital Driving Phase Stability
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Solution Overview
Problem
Current spatial light modulators face challenges in achieving high electric driving frequency and phase stability, especially with ultra-high pixel density, as analog driving schemes struggle with phase temporal fluctuation and linearity at high speeds.
Innovation Solution
A spatial light modulator with a panel and driver, featuring a liquid crystal layer with high figure-of-merit materials and a fast panel driving procedure, ensuring Δn²(γ1k11) > 15 μm²/s, which enhances phase linearity and stability by reducing cell gap and fringing field effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an analog driving scheme is used to achieve high electric driving frequency, then the driving frequency can be increased, but the phase stability deteriorates with ultra-high pixel density
Solution Approach 1:
The patent changes the driving scheme from analog to digital, fundamentally altering the driving parameters and methodology. This parameter change enables high electric driving frequency while maintaining phase stability through precise digital control of pixel states, avoiding the temporal fluctuations inherent in analog schemes at ultra-high pixel densities
2Loss of time
If an analog driving scheme is used to achieve fast liquid crystal response, then the response time can be reduced, but the phase linearity deteriorates
Solution Approach 1:
The patent transitions from analog to digital driving, changing the fundamental operating parameters. Digital driving applies discrete voltage levels that precisely control liquid crystal states, achieving fast response times while maintaining excellent phase linearity through well-defined digital signal levels rather than continuous analog variations
3Measurement precision
If the pixel density is increased to ultra-high levels (4000 PPI), then the panel resolution is improved, but the phase temporal fluctuation increases
Solution Approach 1:
The patent changes the driving methodology to digital, which fundamentally alters how pixel states are controlled at ultra-high densities. Digital driving provides precise, stable control of each pixel state independent of neighboring pixels, preventing the temporal fluctuations that occur in analog schemes when pixel density increases to 4000 PPI
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 enables fast liquid crystal response times, high phase stability, and phase linearity, supporting ultra-high pixel densities and digital driving, while maintaining low voltage requirements, outperforming existing technologies in phase precision and stability.
Implementation Method 1
the liquid crystal layer includes a liquid crystal material having a first figure-of-merit, where FoM-1 represents the first figure-of-merit, Δn represents a birefringence of the liquid crystal material
Implementation Method 2
the panel driver is electrically connected to the panel, so as to drive the panel according to a fast panel driving procedure design
Data Source
AI summary
A spatial light modulator includes a panel and a driver board. The panel includes an ultra-high pixel density backplane and a liquid crystal layer. The ultra-high pixel density backplane includes a pixel array with at least 4000 PPI. The liquid crystal layer includes an ultra-high figure-of-merit liquid crystal material with a first figure-of-merit value. The driver board is connected to the panel for driving the panel by executing a fast panel driving procedure design to achieve low phase error.