Dual-Sided Waveguide Display Electrode Geometry
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Solution Overview
Problem
Transparent displays face challenges with brightness and contrast due to limitations in the configuration of elements, leading to inefficient light scattering.
Innovation Solution
A unique arrangement of electrodes in a geometric pattern is implemented, with inside and outside electrodes arranged in parallel strips or diagonal shapes to minimize unoccupied regions, enhancing light scattering and improving brightness and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional electrode configurations are used in transparent displays, then the display structure is simple, but light scattering efficiency is poor resulting in low brightness and contrast ratios
Solution Approach 1:
The electrode configuration is segmented into multiple functional layers: inside transparent layer with first electrodes, liquid crystal layer, and outside transparent layer with second electrodes. This segmentation allows each layer to perform specific functions in the light scattering process, improving overall brightness while maintaining manageable complexity through functional division.
Solution Approach 2:
Different regions of the electrode structure are assigned different properties and functions. The first electrodes on the inside layer and second electrodes on the outside layer have different orientations and scattering characteristics, creating local variations in light interaction that collectively enhance overall light scattering efficiency and display brightness.
2Illumination intensity
If more electrode elements are added to improve light scattering, then brightness improves, but the configuration complexity increases
Solution Approach 1:
The multi-layer electrode structure serves multiple functions simultaneously: the first and second electrodes collectively scatter light to improve brightness, while the liquid crystal layer modulates light transmission. This multi-functionality allows the system to achieve improved light scattering efficiency without proportionally increasing complexity, as each component contributes to multiple performance aspects.
Solution Approach 2:
The electrode configuration extends into the third dimension with inside and outside transparent layers separated by the liquid crystal layer. This dimensional approach allows light scattering to occur at multiple depths and angles, improving light scattering efficiency without requiring a proportional increase in the number of electrode elements on a single plane.
3Illumination intensity
If the display uses multiple layers to improve light scattering, then brightness and contrast improve, but the manufacturing complexity increases
Solution Approach 1:
The display structure employs a nested layering approach where the liquid crystal layer is positioned between the inside and outside transparent layers with their respective electrodes. This nested configuration allows all components to be integrated in a compact sandwich structure, improving contrast ratio through enhanced light scattering while managing manufacturing complexity through a systematic layered assembly process.
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 geometric pattern effectively captures and scatters light, improving brightness and contrast ratios, allowing the display to appear transparent when not in use while generating images on both sides, with improved light scattering efficiency.
Implementation Method 1
a liquid crystal (LC) layer disposed between the inside transparent layer and the outside transparent layer and together forming a waveguide that is planar
Implementation Method 2
the pixel scatters light introduced via an edge-based light source either through the inside transparent layer or the outside transparent layer
Implementation Method 3
a liquid crystal (LC) layer disposed between the inside transparent layer and the outside transparent layer and together forming a waveguide that is planar
Data Source
AI summary
Various arrangements described herein relate to a dual-sided display with improved light scattering. In one embodiment, a display is disclosed. The display includes an inside transparent layer disposed parallel to and spaced apart from an outside transparent layer. The display also includes a liquid crystal (LC) layer disposed between the inside transparent layer and the outside transparent layer and together forming a waveguide that is planar. The display includes ground electrodes disposed between the LC layer and the outside transparent layer and arranged in strips along the transparent layer, the strips being spaced apart and parallel. The display includes inside electrodes and outside electrodes disposed between the inside transparent layer and the LC layer and defining a geometric pattern that is in plane with the waveguide and a light source disposed at an edge surface of the waveguide and providing light along the waveguide.