Interferometric Modulator Thin Substrate and Diffuser Integration

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Solution Overview

Problem

Existing microelectromechanical systems (MEMS) devices, such as interferometric modulators, face challenges in achieving high contrast and resolution while maintaining a thin profile, particularly in displays with viewing angles and spatial periods of less than 0.45 millimeters, due to limitations in diffuser placement and substrate thickness.

Innovation Solution

The integration of a thin substrate with a thicker diffuser in MEMS devices, allowing for closer proximity of the diffuser to the light modulating elements, enhances contrast and resolution by positioning the diffuser within 0.45 mm of the partial reflector, and utilizing a thin substrate to maintain a compact device thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the diffuser is placed closer to the light modulating elements to enhance contrast and resolution, then the contrast ratio and resolution improve, but the device thickness increases

Engineering Contradiction:

Improvecontrast ratioVSAvoiddevice thickness

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The device is segmented into distinct functional layers: a thin substrate layer (first thickness) and a diffuser layer (second thickness greater than first thickness). This segmentation allows the diffuser to be positioned closer to the light modulating elements while maintaining overall device compactness through clear functional separation of components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from considering only substrate thickness to incorporating diffuser thickness as a separate dimensional parameter. By establishing that the diffuser layer has a greater thickness than the substrate and positioning it closer to the light modulating elements, the solution optimizes optical performance in the vertical dimension while managing overall device profile.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Illumination intensity

If a thicker diffuser is used to improve light diffusion and contrast, then the contrast ratio improves, but the overall device thickness increases

Engineering Contradiction:

Improvelight diffusionVSAvoiddevice thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

Different parts of the device are assigned different thickness qualities optimized for their specific functions: the substrate is made thin to maintain compactness, while the diffuser is made thicker to optimize light diffusion and contrast ratio. This local differentiation of thickness allows each component to perform its function optimally without compromising the other.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The device employs a composite structure combining a thin substrate material with a thicker diffuser material. This composite approach allows the system to achieve both compact form factor (through the thin substrate) and superior light diffusion properties (through the thicker diffuser), resolving the contradiction between these two requirements.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If the diffuser is positioned closer than 0.45 mm to the partial reflector to achieve high resolution, then the resolution improves, but the manufacturing complexity increases

Engineering Contradiction:

ImproveresolutionVSAvoidmanufacturing complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The diffuser layer is applied to the substrate before the light modulating elements are fully assembled and positioned. This preliminary action allows the diffuser to be integrated into the device structure at an earlier stage, facilitating closer positioning (less than 0.45 mm to the partial reflector) while simplifying the overall manufacturing process by avoiding complex post-assembly adjustments.

Inventive Principle:

Principle #10Preliminary action

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 configuration achieves a contrast ratio greater than 5:1 and maintains high reflectivity at a 45° viewing angle, enabling higher resolution displays with improved light diffusion and reduced device thickness.

Implementation Method 1

an interferometric modulator or interferometric light modulator refers to a device that selectively absorbs and/or reflects light using the principles of optical interference

Methodology Applied

Scientific EffectOptical interference: Interference

Implementation Method 2

means for diffusing said light

Methodology Applied

Scientific EffectLight diffusion: Scattering

Data Source

PatentUS7710636B2Systems and methods using interferometric optical modulators and diffusers

Publication Date: 2010.05.04 SNAPTRACK INC

AI summary

Various embodiments include interferometric optical modulators comprising a substrate layer having a thickness between about 0.1 mm to about 0.45 mm thick and a method for manufacturing the same. The interferometric modulator can be integrated together with a diffuser in a display device. The thin substrate permits use of a thicker substrate. The thinner substrate may increase resolution and reduce overall thickness of the inteferometric modulator. The thicker diffuser may provide increased diffusion and durability.