Light Guide Reflection Layer for Efficient Ghost-Free Imaging
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Solution Overview
Problem
Existing light guide devices suffer from low light transmission efficiency due to light absorption by the sidewall, leading to energy loss and the formation of 'ghost images during imaging.
Innovation Solution
A light guide device with a reflection layer positioned internally on the diffraction path of the coupling-out pupil expansion region, utilizing a reflection interface to reflect light after multiple diffraction splits, ensuring a single light path for imaging and preventing 'ghost images, while enhancing light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light recovery device is provided to reflect light absorbed by the sidewall, then light transmission efficiency is improved, but ghost images are formed affecting imaging quality
Solution Approach 1:
The patent extracts the light recovery function from the sidewall and relocates it to an independent reflection layer positioned at a specific angle within the light guide device. This separation allows the reflection layer to recover light without causing the flipping effect that occurs with sidewall reflection, thereby eliminating ghost images while maintaining high light transmission efficiency
Solution Approach 2:
The reflection layer acts as an intermediary element between the light source and the display surface. It intercepts light that would otherwise be absorbed by the sidewall, reflects it at a controlled angle, and redirects it to the display surface, thereby recovering light energy without creating the optical path issues that cause ghost images
2Use of energy by moving object
If light is reflected by the sidewall to improve light utilization, then light transmission efficiency increases, but light direction is flipped creating multiple transmission paths
Solution Approach 1:
The patent applies local quality by positioning the reflection layer with a specific reflective property at a precise location and angle within the light guide device. This localized reflection interface recovers light without flipping its direction, maintaining a single transmission path while improving light utilization efficiency
Solution Approach 2:
The patent changes the reflection angle parameter of the light recovery interface from 90 degrees (sidewall reflection) to a smaller angle relative to the light propagation direction. This parameter change allows the reflection layer to recover light while preserving the correct light direction, avoiding the creation of multiple transmission paths
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
Improves light transmission efficiency by optimizing the light propagation path, reducing energy loss, and enhancing imaging quality without 'ghost images, with a simple structure and low production costs.
Implementation Method 1
The coupling-out pupil expansion region is configured to perform multiple diffraction light splits to coupling-in light coupled into the substrate
Implementation Method 2
the reflection interface is cooperated with the coupling-out pupil expansion region to reflect the light after multiple diffraction light splits through the coupling-out pupil expansion region and reflect the light through the coupling-out pupil expansion region for coupling-out imaging
Data Source
AI summary
Disclosed are a light guide device, a light guide assembly and a display equipment. The light guide device includes a substrate including two opposite surfaces and a sidewall connected between the two surfaces; a coupling-out pupil expansion region provided at the surface; and a reflection layer, wherein a reflection interface of the reflection layer is towards an interior of the substrate and is provided on a diffraction light path of the coupling-out pupil expansion region. The coupling-out pupil expansion region is configured to perform multiple diffraction light splits to coupling-in light coupled into the substrate, and the reflection interface is cooperated with the coupling-out pupil expansion region to reflect the light after multiple diffraction light splits through the coupling-out pupil expansion region and reflect the light through the coupling-out pupil expansion region for coupling-out imaging.