Transparent Display Body with Gradient Refractive Index Layer
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Solution Overview
Problem
Reflective-type video display transparent members suffer from rear show-through and leak light issues, leading to unwanted video display on ceilings and compromised privacy, with existing solutions like anisotropic absorption films causing diffraction and reduced transparency.
Innovation Solution
A display system with sensors to detect brightness, an arithmetic unit to derive background luminance, and a controller to adjust video luminance to maintain a predetermined contrast ratio, ensuring that rear show-through luminance is minimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If anisotropic absorption films are stacked onto the video display transparent member to reduce leak light, then leak light is reduced, but diffraction occurs, transparency is reduced, and haze increases leading to decreased viewability
Solution Approach 1:
The patent changes the optical parameters of the transparent member by forming a gradient refractive index layer with refractive index varying from 1.46 at the incident light side to 1.60 at the opposite side. This gradual parameter change reduces reflection and improves viewability while maintaining transparency, resolving the contradiction between reducing leak light and maintaining viewability
Solution Approach 2:
The patent creates a composite structure by forming a gradient refractive index layer on the transparent member surface. This composite material approach combines the base transparent member with the gradient index layer to achieve both leak light reduction and maintained viewability, avoiding the harmful effects of stacked anisotropic films
2Ease of operation
If video light is projected at an angle onto the reflective-type video display transparent member, then video can be displayed, but a portion of the video light is emitted upward toward the opposite side rather than in the direction of the observer causing unwanted video display on ceilings
Solution Approach 1:
The gradient refractive index layer modifies the light propagation parameters within the transparent member, controlling the emission direction of video light to prevent upward emission toward the ceiling while maintaining observer visibility
3Ease of operation
If video light passes through the rear surface of the reflective-type video display transparent member, then the video is reflected on the rear surface, but an observer on the opposite side can notice the projected video compromising privacy
Solution Approach 1:
The gradient refractive index layer (1.46 to 1.60) optimizes light reflection and transmission parameters to ensure video light is reflected toward the observer side while minimizing transmission through the rear surface, thereby preventing privacy compromise
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 suppresses rear show-through of video, maintaining privacy by dynamically adjusting video luminance based on background luminance, preventing unwanted video display on rear surfaces.
Implementation Method 1
a sensor to detect a brightness of the transparent display body or a brightness around the transparent display body
Implementation Method 2
display video light, which is projected from a projector installed on a video-display-side surface, viewable as video by an observer on the video-display-surface side
Implementation Method 3
enable background light to pass through owing to their transparency
Data Source
AI summary
A display-system includes a transparent-display-body having a first-surface and a second-surface opposite to the first-surface, a sensor to detect a brightness of the transparent-display-body or a brightness around the transparent-display-body, an arithmetic-unit configured to derive, based on the brightness detected by the sensor, a background luminance caused by outside-light as when the transparent-display-body is viewed from a side of the second-surface, and a controller to cause video to be displayed on the first-surface, wherein where rear-show-through-luminance that is a luminance of the video that occurs on the side of the second-surface is denoted as BB and the background luminance is denoted as SB, the controller controls a video luminance in accordance with the background luminance derived by the arithmetic-unit such that (BB/SB) is less than or equal to a predetermined-contrast-value, the video luminance being a luminance at which the video is to be displayed on the first-surface.