Optical Device Light Guide Plate Rear Surface Alignment
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Solution Overview
Problem
In stereoscopic display devices with a light guide plate, aligning a light source at the edge can result in directional changes of exiting light when offset, making it difficult to secure space for the substrate and causing image distortion.
Innovation Solution
An optical device with a light guide plate, an optical deflection surface, and light focusing portions that deflect and converge light to create a three-dimensional image, allowing the light source to be positioned on the rear surface, reducing the need for edge alignment and preventing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light source is aligned with the edge of the light guide plate, then the light direction exiting the light guide plate is stable, but it is difficult to secure space for the substrate and causes image distortion when offset
Solution Approach 1:
The light source is moved from the edge position to the rear surface position of the light guide plate, changing the spatial dimension of light source placement. This dimensional change allows the substrate to be positioned without occupying edge space, while the optical deflection surface ensures light direction stability is maintained through controlled reflection and focusing.
2Area of stationary object
If the light source is offset from the edge, then space for substrate is secured, but the direction of light exiting the light guide plate changes causing image distortion
Solution Approach 1:
The optical deflection surface acts as an intermediary between the light source and the light guide plate. It receives light from the offset light source and precisely controls its direction through reflection and focusing, ensuring that the light enters the light guide plate at the correct angle. This intermediary mechanism decouples the light source position from the light exit direction, allowing substrate space to be secured while maintaining image quality.
3Area of stationary object
If the light source is positioned on the rear surface, then space for substrate is secured and image distortion is prevented, but additional optical components are required
Solution Approach 1:
The optical deflection surface combines multiple functions into a single component: it reflects light from the light source, focuses the light onto specific points, and controls the light direction. This merging of functions reduces the need for separate optical components while achieving the desired light control when the light source is positioned on the rear surface.
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
This configuration ensures stable image projection with reduced beam spread, improving image resolution and preventing distortion, even when the light source is shifted, by guiding light through the light guide plate and focusing it onto specific points.
Implementation Method 1
The optical deflection surface may include a deflecting reflector surface that is provided on the surface opposite the surface carrying the light source; and the deflecting reflector surface reflecting the light entering the light guide plate from the light source and deflecting the light so that the light travels along the light guide direction of the light guide plate.
Implementation Method 2
a plurality of light focusing portions where each light focusing portion includes an optical surface whereon the light deflected by the optical deflection surface and guided by the light guide plate is incident, and which causes the emission surface to output emission light that converges substantially on a convergence point or convergence line in a space
Data Source
AI summary
An optical device has a light guide plate that guides light in a plane parallel to an emission surface thereof, an optical deflection surface that deflects light entering the light guide plate from a light source that faces a plane parallel to at least the emission surface or the surface opposite the emission surface, so that the light travels along the light guide direction of the light guide plate, and a plurality of light focusing portions. Each of the light focusing portions includes an optical surface whereon the light deflected by the optical deflection surface and guided by the light guide plate is incident, and which causes the emission surface to output emission light that converges substantially on a convergence point or convergence line in a space, or that radiates substantially from a convergence point or convergence line in a space.