Light-Guiding Device Reflection Member Bonding Layer Leakage
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Solution Overview
Problem
Wearable see-through image display devices experience light leakage due to the bonding layer between the incident section and the light guide, leading to image quality deterioration.
Innovation Solution
Incorporating a reflection member on the side surface of the bonding layer to reflect light incident at angles below the critical angle back into the bonding layer, reducing light leakage and enhancing image quality by using a light shielding member to prevent ghosting effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bonding layer is used to bond the incident section and the light guide, then the two components can be securely connected, but light leakage occurs from the side surface of the bonding layer
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the bonding layer's side surface, which was previously a source of light leakage, as a functional reflection surface. By providing a reflection member (such as a reflective coating or reflective material) on the side surface of the bonding layer, light that would otherwise leak out is instead reflected back into the bonding layer, converting the harmful light leakage into a beneficial light guidance function. This resolves the contradiction by maintaining the bonding layer's structural role while eliminating its optical defect.
2Reliability
If light is incident on the side surface of the bonding layer at an angle smaller than the critical angle, then light can pass through the bonding layer, but light leakage occurs and image quality deteriorates
Solution Approach 1:
The patent converts the harmful effect of light incident at angles smaller than the critical angle (which causes leakage) into a beneficial effect by introducing a reflection member on the side surface of the bonding layer. This reflection member reflects such light back into the bonding layer, ensuring all light is guided reliably and preventing image quality deterioration from leakage.
Solution Approach 2:
The patent changes the optical parameter of the bonding layer's side surface by adding a reflection member, which alters the light interaction from transmission (causing leakage) to reflection (preventing leakage). This parameter change ensures that light incident at any angle, including angles smaller than the critical angle, is reflected back into the bonding layer rather than leaking out, thereby improving both reliability and image quality.
3Object-generated harmful factors
If a reflection member is provided on the side surface of the bonding layer, then light leakage is suppressed, but the device structure becomes more complex
Solution Approach 1:
The patent applies the merging principle by integrating the reflection member with the bonding layer or the light guide structure. The reflection member can be formed as part of the bonding layer (e.g., by applying a reflective coating to the side surface) or integrated with the light guide housing, thereby combining multiple functions into a single structure. This reduces the number of separate components and simplifies the overall device structure while still achieving light leakage suppression.
Solution Approach 2:
The patent makes the bonding layer or its associated structure multi-functional by having it serve both as the bonding interface between components and as the reflection surface for light. The side surface of the bonding layer, which was previously only structural, is given an optical function through the reflection member, allowing it to perform both bonding and light reflection functions simultaneously, thereby reducing the need for separate dedicated reflection components.
4Illumination intensity
If light travels toward the surface without passing through the bonding layer after being reflected by the reflection member, then light can reach the observer, but ghosting effects occur due to overlapping angle components
Solution Approach 1:
The patent applies the extraction principle by using a light shielding member to extract or block the harmful light paths that cause ghosting effects. The light shielding member is positioned to intercept light that has been reflected by the reflection member and is traveling toward the surface without passing through the bonding layer. By blocking these specific light paths, the patent eliminates ghosting effects while preserving the beneficial light transmission paths that carry the main image information to the observer's eye.
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 effectively suppresses light leakage and maintains image quality by reflecting light back into the bonding layer and shielding light that would cause ghosting, allowing observers to see a clear image without quality deterioration.
Implementation Method 1
it is possible to reflect the light by the reflection member provided on the side surface, and thus to return the light inside the bonding layer
Implementation Method 2
the light shielding member shields the light traveling toward the surface without passing through the bonding layer after being reflected by the reflection member
Data Source
AI summary
A light-guiding device according to an aspect of the invention includes an incident section configured to make light incident, a light guide configured to guide the light incident from the incident section, a bonding layer configured to bond the incident section and the light guide, and a reflection member provided on a side surface of the bonding layer.