Micromirrors for Color Electronic Paper via Segmented Tilting
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Solution Overview
Problem
Current direct-view displays are either black and white, have high power usage, or poor contrast ratio, necessitating a solution for multistate micromirrors in electronic paper color displays to enhance image visibility and energy efficiency.
Innovation Solution
An array of micromirrors with tiltable states positioned between filters that absorb white light and transmit color light, allowing for reflective states that adjust to either reflect light back, absorb it, or transmit specific wavelengths, integrated with a substrate and reflectors to manage light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If current direct-view display technologies are used, then display functionality is provided, but the displays are limited to black and white or have high power usage or poor contrast ratio
Solution Approach 1:
The micromirror device is segmented into multiple independent tilt states (first state for white light reflection, second state for color light transmission, third state for black light absorption). Each state corresponds to a specific micromirror orientation that directs light to different filters, enabling color display functionality through segmentation of the optical path.
Solution Approach 2:
The micromirror is designed with dynamic tilting capability that allows it to switch between multiple stable states. The micromirror can be tilted to different angles to selectively reflect or transmit light through various filters, providing adaptive color display capabilities while maintaining low power consumption in each stable state.
2Adaptability or versatility
If multistate micromirrors are used for color display, then color image capability is improved, but device complexity increases
Solution Approach 1:
A single micromirror structure performs multiple functions by tilting to different states: reflecting white light in the first state, transmitting color light through filters in the second state, and absorbing light in the third state. This multi-functionality reduces device complexity compared to using separate components for each color display function.
Solution Approach 2:
Filters are introduced as intermediary elements between the micromirror and the viewer. These filters selectively transmit or absorb light based on wavelength, enabling color display functionality without requiring complex color generation mechanisms in the micromirror itself. The filters act as mediators that simplify the overall system design.
3Adaptability or versatility
If filters are added to enable color display, then color transmission is improved, but light absorption increases power usage
Solution Approach 1:
The micromirror operates by periodically switching between different tilt states to display color images. In each stable state, the micromirror maintains its position with minimal power consumption, using the filters to handle the color selection. The power is only consumed during state transitions, not during the display of each color state.
Solution Approach 2:
The system uses passive optical filtering rather than active color generation. The filters self-select which wavelengths to transmit or absorb based on their optical properties, eliminating the need for power-consuming color generation mechanisms. The micromirror simply directs light to the appropriate filter, and the filter handles the color selection autonomously.
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 low-power, high-contrast direct-view displays capable of producing color images by effectively managing light reflection and absorption, addressing the limitations of existing technologies.
Implementation Method 1
each micromirror of the array of micromirrors (i) having a non-tilted first state that reflects incident light back toward the source of the incident light
Implementation Method 2
a respective first filter that absorbs white light
Implementation Method 3
a respective second filter that transmits color light of selected wavelengths
Implementation Method 4
tiltable to a second state to reflect incident light into the first filters
Implementation Method 5
tiltable to a third state to reflect incident light through the second filters
Data Source
AI summary
Direct view color displays and design structures of direct view color displays. The direct view displays include micromirrors having un-tilted and tilted states and multiple color filters or color reflectors.