Input Coupler Linear Light Conversion for Autostereoscopic 3D Displays
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Solution Overview
Problem
Existing 3D display apparatuses, particularly binocular stereoscopic systems, require special glasses, which is inconvenient for users, and autostereoscopic systems face challenges in efficiently converting point light sources into linear light sources for effective 3D image display without glasses.
Innovation Solution
An input coupler is designed with semi-reflectors and optical path changing members to convert point light sources into linear light sources, utilizing a combination of reflective and transmissive surfaces to achieve a linear beam distribution, and is integrated into a 3D image display apparatus with a backlight unit and spatial light modulator for holographic image reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If binocular stereoscopic display apparatuses are used, then 3D images can be provided easily, but users have to wear special glasses which is inconvenient
Solution Approach 1:
The patent extracts and eliminates the need for special glasses from the 3D display system by implementing an autostereoscopic display apparatus that generates 3D images directly viewable by the human eye through optical elements arranged in the display device itself
Solution Approach 2:
The patent introduces optical elements (lenses, mirrors, or prisms) as intermediaries within the display apparatus to manipulate light paths and create multiple views, serving as a mediator between the light source and the viewer's eyes without requiring external glasses
2Manufacturing precision
If point light sources are converted into linear light sources using conventional methods, then light distribution can be achieved, but coupling efficiency and uniformity are insufficient
Solution Approach 1:
The patent segments the light conversion process into multiple stages using a combination of first and second optical elements with different functions (first element for path transformation, second element for directional control), where each segment contributes to the overall coupling efficiency and uniformity
Solution Approach 2:
The patent applies different optical properties to different parts of the system by using optical elements with specifically designed reflective and transmissive surfaces having different inclinations and configurations, optimizing local light manipulation to achieve global uniformity
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 enables the creation of high-uniformity linear light sources, enhancing the efficiency and convenience of 3D image display by eliminating the need for special glasses and improving the coupling efficiency and uniformity of light distribution, thereby providing a more realistic 3D viewing experience.
Implementation Method 1
each of the plurality of semi-reflectors including a reflective surface that is inclined with respect to the optical path and configured to reflect a first portion of the light and transmit a second portion of the light
Implementation Method 2
a plurality of optical path changing members configured to change an optical path of the light transmitted through the plurality of semi-reflectors
Data Source
AI summary
An input coupler includes: a plurality of semi-reflectors located along an optical path along which a light incident from a light source travels, each of the plurality of semi-reflectors comprising a reflective surface that is inclined with respect to the optical path and configured to reflect a first portion of the light and transmit a second portion of the light; and a plurality of optical path changing members configured to change an optical path of the light transmitted through the plurality of semi-reflectors, wherein the plurality of semi-reflectors and the plurality of optical path changing members are arranged such that the light passing through at least one of the plurality of semi-reflectors and emitted in one direction has a linear beam distribution.