Linear Dense-Packed Spatial Light Modulator Thermal Management
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Solution Overview
Problem
Conventional ribbon-type spatial light modulators require complex alignment mechanisms and additional optics for precise illumination, leading to reduced contrast and efficiency due to thermal gradients caused by high power-density laser exposure, which shortens device life.
Innovation Solution
A linear dense-packed spatial light modulator (LDSLM) with a two-dimensional array of modulators, where each pixel includes a tent member and a movable actuator, allowing for independent modulation of light phase and magnitude without the need for linear illumination optics, and capable of handling increased power densities without thermal gradient issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ribbon-type SLMs use line illumination to achieve high contrast modulation, then contrast and modulation efficiency are improved, but thermal gradients increase causing device failure
Solution Approach 1:
The patent transitions from one-dimensional ribbon-type modulators to two-dimensional dense-packed modulator arrays. This dimensional change allows illumination to be distributed across a two-dimensional area rather than concentrated along a one-dimensional line, reducing power density while maintaining modulation effectiveness. The 2D arrangement with multiple modulators per pixel enables this spatial redistribution of optical power.
Solution Approach 2:
The patent divides each pixel into multiple 2D modulators (e.g., four modulators per pixel arranged in a 2x2 pattern). This segmentation allows the illumination power to be distributed across multiple discrete modulator elements rather than concentrated on a single ribbon structure, reducing thermal load on each individual modulator while maintaining overall pixel functionality.
2Reliability
If ribbon-type SLMs use narrow line illumination to reduce thermal gradients, then device reliability is improved, but additional optics and alignment mechanisms are required increasing complexity
Solution Approach 1:
The 2D dense-packed modulator array structure inherently provides tolerance to illumination misalignment and variation. The distributed 2D geometry of multiple modulators per pixel creates a self-aligning effect where the system maintains performance across a broader range of illumination conditions without requiring precision alignment mechanisms or additional corrective optics.
3Productivity
If ribbon-type SLMs increase illumination power to improve throughput, then productivity is improved, but thermal gradients increase causing metal migration and efficiency reduction
Solution Approach 1:
The 2D dense-packed modulator array provides multiple functional benefits simultaneously: it enables high illumination power handling through spatial distribution, maintains high contrast modulation, eliminates the need for precision alignment optics, and provides tolerance to illumination variations. This multi-functional design allows the system to achieve high throughput without sacrificing reliability or requiring complex auxiliary 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 LDSLM provides improved contrast and power handling capabilities, eliminating the need for complex alignment mechanisms and reducing thermal gradients, thus extending device life and reducing costs by allowing wider illumination without efficiency loss.
Implementation Method 1
an actuator electrode to generate an electrostatic force between one of a number of drive electrodes on the surface of the substrate and the movable actuator
Implementation Method 2
light reflected from the active ribbons interferes with that reflected from the static ribbons
Implementation Method 3
a continuous, programmable diffraction grating results
Data Source
AI summary
A linear dense-packed spatial light modulator (LDSLM) and method of modulating light using the same are provided. In one embodiment, the LDSLM comprises a plurality of two dimensional (2D) modulators grouped proximal to one another on a surface of a substrate to form a densely-packed, linear array having a plurality of pixels along a longitudinal axis of the array. Each pixel includes a number of 2D modulators electrically coupled to receive a common drive signal and to modulate light reflected therefrom in response to the drive signal. Preferably, each pixel includes at least two 2D modulators grouped along a transverse axis of the array. More preferably, the number of 2D modulators along the transverse axis in each pixel is selected to provide a desired power density while avoiding an undesired thermal gradient across the LDSLM. The LDSLM and method are particularly useful in printing applications. Other embodiments are also disclosed.