Light Guide Member With Inclined Portion For Ghost Image Suppression
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Solution Overview
Problem
Conventional light guide members face challenges in reducing thickness while maintaining image continuity and minimizing reflections, leading to increased discontinuity and ghost images due to high reflection numbers.
Innovation Solution
A light guide member design incorporating an incident portion, emission portion, reflection portion, and inclined portion with specific inclination angles and structural configurations that allow for a larger internal reflection angle than the incident angle, reducing thickness while ensuring image continuity by controlling the number of reflections and using a light absorption film to prevent ghost images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light guide member thickness is reduced, then the device becomes more compact, but the number of reflections increases causing image discontinuity and ghost images
Solution Approach 1:
The patent introduces an inclined portion that connects the incident portion and reflection portion at a specific inclination angle. This dimensional change in the optical path design allows the light to travel through a longer effective path within a shorter physical thickness, reducing the number of reflections needed while maintaining image quality and continuity.
Solution Approach 2:
The patent optimizes specific parameters including the inclination angle of the inclined portion, the height of the incident portion, and the distance between emission and reflection portions. By carefully adjusting these parameters, the optical path is optimized to minimize reflections while maintaining image continuity, resolving the contradiction between thinness and reliability.
2Reliability
If the number of reflections is increased to maintain image quality in thinner designs, then image continuity is maintained, but ghost images and discontinuity increase
Solution Approach 1:
The patent extracts and eliminates unnecessary reflections from the optical path by introducing the inclined portion. This design allows the light to reach the emission portion with fewer reflections, removing the source of ghost images and discontinuity while maintaining image quality in a thinner configuration.
3Object-generated harmful factors
If the incident portion height is increased to reduce reflections, then ghost images are suppressed, but the device thickness increases
Solution Approach 1:
The inclined portion changes the dimensional arrangement of the optical path, allowing the light to traverse a longer effective distance at an angle. This enables suppression of ghost images through optimized light path geometry without increasing the overall device thickness in the vertical direction.
Solution Approach 2:
The patent optimizes the inclination angle and height parameters to achieve the optimal balance between ghost image suppression and device thickness. By adjusting these parameters, the design suppresses harmful reflections while maintaining compact dimensions.
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 design achieves a thinner light guide member with reduced reflections and maintained image continuity, suppressing ghost images and discontinuity, and allowing for efficient light transmission and reflection.
Implementation Method 1
the emission portion is in contact with the first side of the incident portion and configured to transmit a part of the external light incident on the emission portion and reflect another part of the external light incident on the emission portion
Implementation Method 2
transmit a part of the external light incident on the emission portion
Implementation Method 3
the reflection portion is disposed in parallel with the emission portion to be separated from the emission portion and is configured to reflect the external light incident on the reflection portion
Implementation Method 4
An internal reflection angle inside the reflection portion and the emission portion is larger than an incident angle of an external light
Data Source
AI summary
A light guide member includes an incident portion, an emission portion, a reflection portion, and an inclined portion. An internal reflection angle inside the reflection portion and the emission portion is larger than an incident angle of an external light with respect to a first normal line that is a normal line of the emission portion. A first inclination angle that is an inclination angle of the incident portion with respect to the first normal line is smaller than the internal reflection angle. A height from the emission portion to a second side of the incident portion is larger than a distance between the emission portion and the reflection portion. A second inclination angle that is an inclination angle of the inclined portion with respect to the first normal line is smaller than the internal reflection angle.