Mirror Display With Micro-Optical Switch Array
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Solution Overview
Problem
Mirror displays face a trade-off between reflectivity and light transmission efficiency due to the limitations of transflective films, which restrict the ability to increase reflectivity while maintaining image transmission.
Innovation Solution
A mirror display incorporating a micro-optical switch array with a light guide plate, first and second electrode layers, and a substrate, where the micro-optical switches can be turned on and off to control light transmission and reflectivity, allowing for high reflectivity without compromising light transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transflective film is used to combine mirror and display functions, then the device can function as both mirror and display, but the light transmission efficiency of the liquid crystal display decreases and there is a trade-off between reflectivity and image transmission
Solution Approach 1:
The patent divides the electrode structure into first and second electrode layers with distinct functions. The first electrode layer includes first holes that align with second holes in the second electrode layer, creating segmented regions that can independently control light transmission and reflection properties, thereby resolving the trade-off between reflectivity and light transmission efficiency
Solution Approach 2:
The patent employs dynamic control of the liquid crystal layer between the electrode layers. By applying voltage, the liquid crystal orientation changes to switch between mirror mode (high reflectivity) and display mode (high light transmission), enabling adaptive optimization of both functions without fixed compromise
2Illumination intensity
If the reflectivity of the transflective film is increased, then more incident light is reflected, but the transmission of images formed by the liquid crystal display is reduced
Solution Approach 1:
The patent uses dynamic voltage control to switch the liquid crystal layer between different optical states. In mirror mode, the liquid crystal orientation maximizes reflectivity; in display mode, it maximizes light transmission. This dynamic switching allows optimization of either parameter depending on operational requirements, eliminating the fixed trade-off
Solution Approach 2:
The patent creates local variations in electrode structure through the patterned first and second holes. These local structural variations enable different regions to optimize for either reflection or transmission based on their specific geometric characteristics, allowing simultaneous optimization of both functions at different locations
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 a mirror display with a reflectivity of 70% or greater, allowing it to function effectively as both an image display and a mirror without the trade-offs associated with traditional transflective films, enhancing optical efficiency and manufacturing simplicity.
Implementation Method 1
an image signal inputter configured to control light transmission by varying a time period during which a voltage is applied between the first electrode layer and the second electrode layer
Implementation Method 2
The second electrode layer may have a reflectivity of 70% or greater. The second electrode layer may reflect external light incident on the mirror display.
Implementation Method 3
a light guide plate configured to guide light emitted from the light source
Data Source
AI summary
A mirror display includes a light source, a light guide plate configured to guide light emitted from the light source, a first electrode layer spaced apart from the light guide plate and including at least one first hole, a first spacer provided between the light guide plate and the first electrode layer, a second electrode layer spaced apart from the first electrode layer and including at least one second hole not facing the first hole, and a substrate provided on the second electrode layer.