Dry Particle Total Internal Reflection Display
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Solution Overview
Problem
Conventional reflective image displays, such as electrophoretic two-particle displays, suffer from limited brightness and slow switching speed, making them unsuitable for applications like web browsing and video content viewing due to their reliance on liquid media and dual particle systems.
Innovation Solution
A dry particle totally internally reflective image display using a gas medium with electrostatically mobile particles, where a single type of charged particle moves within a sealed cavity between a transparent front sheet with convex protrusions and a rear electrode, allowing for faster switching and higher brightness through total internal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrophoretic two-particle displays use liquid media and dual particle systems, then long battery life and diffused reflection are achieved, but brightness is limited and switching speed is slow
Solution Approach 1:
The patent extracts and eliminates one of the two particle types from the display system, transitioning from a dual-particle electrophoretic system to a single-particle FTIR system. This simplification allows particles to move faster and achieve higher brightness while maintaining the desired display functionality.
Solution Approach 2:
The patent changes the physical state of the medium from liquid to gas, which fundamentally alters the particle mobility and interaction with light. This parameter change enables faster switching speeds and enhanced brightness by eliminating the constraints of liquid media while using a single particle type.
2Speed
If conventional electrophoretic displays use liquid electrophoretic medium, then particle movement is controlled, but switching speed is slow due to longer particle travel distance
Solution Approach 1:
The patent transitions from a liquid-based three-dimensional particle suspension to a gas-based system where particles move through a different physical dimension. This dimensional change reduces the distance particles must travel and eliminates viscous drag, achieving much faster switching speeds.
Solution Approach 2:
By changing the medium from liquid to gas, the patent fundamentally alters the physical parameters governing particle motion. The gas phase provides lower viscosity and different dielectric properties, enabling particles to respond much faster to voltage changes and achieve rapid switching.
3Illumination intensity
If FTIR displays use liquid medium with electrophoretically mobile particles, then TIR frustration occurs within evanescent region, but brightness is limited by refractive index difference
Solution Approach 1:
The patent changes the medium from liquid to gas, which has a significantly lower refractive index. This parameter change creates a larger refractive index difference at the TIR interface, enhancing the brightness of the display while maintaining the ability to frustrate TIR through particle placement in the evanescent region.
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 use of a gas medium enhances brightness and reduces switching time by eliminating the need for dual particle interactions, resulting in improved reflectance and efficiency compared to traditional displays.
Implementation Method 1
Dry particles that are moved by an applied electric field in a gas are referred to as electrostatically mobile particles
Implementation Method 2
The front sheet may comprise of a plurality of structures such as convex protrusions of a hemispherical shape that are capable of total internal reflection of light
Implementation Method 3
Light modulation in conventional total internal reflection (TIR) image displays may be controlled by movement of electrophoretically mobile particles into and out of the evanescent wave region at the surface of the front sheet
Data Source
AI summary
A total internal reflection image display comprised of dry electrostatically mobile particles composed of a solid material stably floating as a dispersant in a gas and exhibiting a high fluidity in an aerosol state may be sealed between the transparent sheet capable of total internal reflection such as comprising a plurality of transparent convex or hemi-spherical protrusions and the rear support, partition walls and the dry particles may be moved by application of a voltage bias. A method of manufacture is described comprising of the steps of forming partition walls, filling with dry particles, sealing the particles into cells or compartments.