Spatial Light Modulator Void Structure for Thermal Crosstalk Isolation
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Solution Overview
Problem
Spatial light modulators experience thermal interference and increased power consumption due to heat generated in driven pixels affecting non-driven pixels, which impacts their operation and efficiency.
Innovation Solution
A spatial light modulator design featuring a void block layer with pillars supporting pixels, creating vacuum regions between the substrate and pixels, and trenches between adjacent pixels to reduce thermal interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixels are closely arranged on the substrate to increase pixel density, then the device area is reduced, but thermal interference between adjacent pixels increases
Solution Approach 1:
The device introduces isolation structures (trenches and void block layers) that segment the continuous substrate into isolated pixel regions. These structures physically divide the thermal pathways between adjacent pixels, allowing each pixel to be thermally independent while maintaining close spatial arrangement on the substrate.
Solution Approach 2:
The isolation structures act as thermal intermediaries or barriers between adjacent pixels. The trenches filled with low thermal conductivity material and the void block layer serve as mediating elements that block heat transfer from driven pixels to non-driven pixels, reducing thermal interference while maintaining device compactness.
2Reliability
If driving voltage is increased to improve phase modulation depth, then modulation efficiency is improved, but power consumption increases
Solution Approach 1:
The patent converts the harmful thermal effect into a beneficial isolation mechanism. By introducing trenches and void block layers that thermally isolate pixels, the system reduces unwanted heat transfer to non-driven pixels. This thermal management enables more efficient use of driving power, as energy is concentrated in driven pixels rather than being wasted heating adjacent non-driven pixels, thereby reducing overall power consumption while maintaining modulation depth.
3Object-affected harmful factors
If thermal isolation structures are added between pixels, then thermal interference is reduced, but device complexity increases
Solution Approach 1:
The patent employs a void block layer containing air voids or vacuum regions as the isolation medium. These porous/void structures provide effective thermal isolation since air and vacuum have very low thermal conductivity. The voids are integrated into the pixel support structure, combining thermal management functionality with mechanical support without adding separate complex isolation systems.
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 design minimizes thermal crosstalk and power consumption, enhancing the stability and efficiency of phase modulation, improving beam steering accuracy and reducing high-order beam intensity.
Implementation Method 1
a cavity layer disposed between the upper reflective layer and the lower reflective layer and having a refractive index that changes based on an electrical signal
Implementation Method 2
void regions formed between the substrate and the plurality of pixels... substantially a vacuum
Data Source
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AI summary
A spatial light modulator for modulating a phase of incident light and emitting phase-modulated light includes a substrate, a plurality of pixels, and a void block layer. Each pixel of the plurality of pixels includes an upper reflective layer, a lower reflective layer, and a cavity layer disposed between the upper reflective layer and the lower reflective layer and having a refractive index that changes based on an electrical signal. The void block layer includes a plurality of pillars supporting the plurality of pixels and separating the plurality of pixels from the substrate, and void regions formed between the substrate and the plurality of pixels.