Speckle Reduction Screen with Rotating Dielectric Particles
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Solution Overview
Problem
Conventional screens using coherent light sources suffer from significant speckle issues due to the fixed incidence angle of coherent light beams, leading to degraded image quality, and existing solutions like dynamic incidence angles or electronic paper screens face durability and upscaling challenges.
Innovation Solution
A screen comprising a particle layer with particles of different dielectric constants, where an electric field is applied to rotate the particles, altering their orientation and position to change diffusion characteristics and reduce speckles, while maintaining a monochrome appearance and high durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a screen uses a fixed diffusion structure to maintain stable image display, then structural simplicity is achieved, but speckles are significantly observed due to fixed incidence angle of coherent light beams
Solution Approach 1:
The patent applies the dynamics principle by making the screen's diffusion structure changeable over time. The screen includes a particle layer with particles that can change their arrangement or orientation in response to varying the incidence angle of the coherent light beam. This dynamic adaptation allows the screen to reduce speckles by ensuring that scattering patterns change as the light incidence changes, preventing fixed speckle patterns from forming while maintaining relatively simple overall structure.
2Object-affected harmful factors
If electronic paper is used to change screen diffusion characteristics with time, then speckles are reduced, but durability is insufficient and upscaling is difficult
Solution Approach 1:
The patent applies parameter changes by modifying the physical state or arrangement of particles in the particle layer rather than relying on electronic paper technology. The particles can be moved, rotated, or repositioned to change the diffusion characteristics of the screen. This approach uses physical parameter changes in a robust particle-based system, which inherently provides better durability and scalability compared to electronic paper, while still achieving the goal of reducing speckles through time-varying diffusion characteristics.
3Object-affected harmful factors
If particles are rotated by electric field to change diffusion characteristics, then speckles are reduced, but energy consumption increases due to continuous voltage application
Solution Approach 1:
The patent applies periodic action by varying the incidence angle of the coherent light beam over time rather than continuously rotating particles through continuous voltage application. The screen's particle layer responds to these periodic changes in light incidence by adjusting its diffusion characteristics. This periodic modulation approach reduces speckles while minimizing energy consumption, as the system only requires intermittent or minimal energy input to maintain the particle arrangement, rather than continuous energy input for particle rotation.
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
Effectively reduces speckles by dynamically changing the screen's diffusion characteristics, improving image quality without degrading brightness or causing color tone changes, and is suitable for large-scale and durable applications.
Implementation Method 1
electrodes which form an electric field driving the plurality of particles of the particle layer by applying a voltage to the particle layer
Implementation Method 2
Dielectric constants of the first part and the second part of the particles may be different from each other
Implementation Method 3
a first part having a light diffusing function
Data Source
AI summary
There is provided a screen capable of sufficiently reducing speckles. A screen for displaying an image by being irradiated with a light beam from a projector, is provided with a plurality of particles each including a first part and a second part different in dielectric constant, a particle layer having the plurality of particles, and electrodes which form an electric field for driving the particles of the particle layer by applying a voltage to the particle layer.