Anisotropic Scatterer for Uniform Luminance in Reflective Displays
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Solution Overview
Problem
Display devices with reflective image display sections using anisotropic scatterers suffer from non-uniform light intensity when viewed from different angles, leading to a metallic luster impression as the size of the display increases, due to angle-dependent scattering characteristics.
Innovation Solution
An anisotropic scatterer is designed to continuously change its scattering characteristics in the in-plane direction by mixing low and high refractive index regions with varying refractive index differences, allowing uniform luminance when viewing images of the same gray-scale from a predetermined position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a directional scattering film is disposed on the front surface of a liquid crystal panel as an anisotropic scatterer to increase reflectance for a predetermined view position, then the visibility is improved and compensation for reduction in visibility due to reduction in reflectance incidental to displaying in color is achieved, but non-uniformity in the intensity of light viewed occurs and the image appears metal-lustrous in quality
Solution Approach 1:
The patent applies local quality by creating regions with different scattering characteristics across the display surface. Specifically, it uses a first anisotropic scatterer with a first scattering characteristic and a second anisotropic scatterer with a second scattering characteristic that differs from the first. This allows different local areas to have optimized scattering properties for their specific positions, achieving both high reflectance for the predetermined view position and uniform light intensity distribution across the entire display region.
Solution Approach 2:
The patent segments the scattering function by dividing the display surface into multiple regions with different anisotropic scatterers. Instead of using a single uniform scattering film, it employs multiple scatterers with different scattering characteristics in different areas. This segmentation allows each region to contribute differently to the overall light distribution, preventing the metal-lustrous appearance while maintaining high reflectance where needed.
2Area of stationary object
If the size of the image display section is increased to provide larger display area, then the display area is expanded, but the non-uniformity in light intensity becomes more pronounced and the metal-lustrous impression is enhanced
Solution Approach 1:
The patent addresses the uniformity issue in large displays by implementing local quality variations across the expanded display area. By positioning different anisotropic scatterers with different scattering characteristics at different locations, it ensures that each local region contributes appropriately to the overall light distribution. This prevents the metal-lustrous appearance from being amplified in larger displays while maintaining the benefits of increased display area.
Solution Approach 2:
The patent segments the large display area into multiple zones, each equipped with anisotropic scatterers optimized for their specific position. This segmentation strategy allows the large display to maintain uniform light intensity distribution by treating different areas independently with appropriate scattering characteristics, rather than applying a uniform scattering approach that would exacerbate non-uniformity in larger sizes.
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 mitigates the metallic luster impression by ensuring uniform light intensity across the display, enhancing the viewing experience by maintaining consistent luminance regardless of the display size.
Implementation Method 1
an anisotropic scatterer being configured to allow a scattering characteristic of light in a display region of a display device to have an angle dependence
Implementation Method 2
by mixing low and high refractive index regions with varying refractive index differences
Data Source
AI summary
An anisotropic scatterer is configured to allow a scattering characteristic of light in a display region of a display device to have an angle dependence, and is configured to change the scattering characteristic of the light continuously in an in-plane direction.