Side-Illuminated Mirror Display with High Transmittance
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Solution Overview
Problem
Existing transparent display devices with integrated mirror functionality face limitations in visible light transmittance, degrading their performance as mirrors due to the lower transmittance in regions with display functions, which restricts the area where display functionality can be provided.
Innovation Solution
A display device configuration featuring a liquid crystal layer sandwiched between substrates, a side light source device, and a light reflection film covering the entire display region, ensuring high visible light transmittance and allowing for both mirror and display functions to be utilized effectively across the entire surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If members required for image display such as a light source device are arranged in a region to which a display function is provided, then the display function can be exerted, but the visible light transmittance in that region becomes lower, degrading the mirror performance
Solution Approach 1:
The light source device is positioned outside the display region and arranged to illuminate through the side surface of the second substrate, rather than placing it within the display region. This spatial reconfiguration allows the display region to maintain high visible light transmittance for mirror functionality while still enabling display operations through indirect illumination paths.
Solution Approach 2:
The side surface of the second substrate acts as an intermediary element that allows light from the externally positioned light source to reach the liquid crystal layer without occupying the display region. This intermediary positioning enables separation of the light source from the display area, maintaining optical clarity for mirror functions.
2Illumination intensity
If the visible light transmittance is improved to maintain mirror performance, then the mirror function is enhanced, but the region where display function can be provided is limited to a part of the entire mirror surface
Solution Approach 1:
By moving the light source arrangement to utilize the side surface dimension rather than occupying the planar display region, the invention enables full-area display functionality without compromising the visible light transmittance needed for mirror performance across the entire surface.
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
Enhances the performance of the display device as both a mirror and a display by maintaining high visible light transmittance across the entire surface, enabling seamless recognition of superimposed images and backgrounds without discomfort.
Implementation Method 1
a liquid crystal layer arranged between the first substrate and the second substrate
Implementation Method 2
a light reflection film formed on either a side with the first back surface of the first substrate or a side with the second front surface of the second substrate
Implementation Method 3
a light source device mounted on the first front surface of the first substrate and arranged at a position facing the first side surface of the second substrate
Data Source
AI summary
A display device includes a display region, a peripheral region, a first substrate, a second substrate having a side surface, a liquid crystal layer arranged between the first substrate and the second substrate, a side light source device mounted on a front surface of the first substrate and arranged at a position facing the side surface of the second substrate, and a light reflection film formed on either a side with a back surface of the first substrate or a side with a front surface of the second substrate. The light reflection film covers the entire display region.