Light Guide Plate Optical Path Redirection for High-Angle Stereoscopic Clarity
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Solution Overview
Problem
Existing stereoscopic image display apparatuses distort when viewed from high angles due to increased spreading sensitivity of light as the viewing angle exceeds 60°, leading to shape errors and blurring.
Innovation Solution
Incorporating a light guide plate with optical path changing units that redirect light to adjacent quadrants, reducing the angle difference between incident and emitted light, thereby minimizing spreading sensitivity and maintaining image clarity at high viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional light guide plate with prisms is used, then stereoscopic image can be displayed, but image distortion occurs at high viewing angles (45° or higher)
Solution Approach 1:
The light guide plate is divided into multiple regions with different optical path changing units (first type for low viewing angles, second type for high viewing angles). Each region is optimized for its specific viewing angle range, allowing the overall system to maintain image accuracy across a wide viewing angle range without distortion.
Solution Approach 2:
Different portions of the light guide plate are assigned different optical properties through the use of different optical path changing units. The first type of unit (e.g., with 45° reflective surfaces) is used for low viewing angle regions, while the second type (e.g., with 30° or 60° reflective surfaces) is used for high viewing angle regions, optimizing local performance for each viewing zone.
2Measurement precision
If optical path changing units redirect light to adjacent quadrants, then spreading sensitivity is reduced, but device complexity increases
Solution Approach 1:
The optical path changing units are designed with asymmetric reflective surfaces at specific angles (30°, 45°, or 60°) relative to the light incident direction. This asymmetric configuration redirects light to adjacent quadrants rather than symmetric opposite directions, effectively reducing spreading sensitivity while maintaining a manageable device structure through geometric optimization.
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
Enables undistorted recognition of stereoscopic images even when viewed from high angles by reducing the spreading sensitivity of light, ensuring clear and accurate image perception across a wider viewing range.
Implementation Method 1
a light guide plate configured to guide incident light and emit the light from an outgoing surface
Implementation Method 2
a plurality of optical path changing units each configured to change an optical path of the light guided into the light guide plate and emit the light from the outgoing surface
Data Source
AI summary
A first stereoscopic image display device includes a light guide plate having a plurality of reflectors and causes an observer to recognize an undistorted stereoscopic image even when the observer views a stereoscopic image from a high angle with respect to a direction normal to the front surface of the light guide plate. In a plan view from a direction vertical to an outgoing surface, when four quadrants are specified for each of the reflectors, the four quadrants taking a position of each of the reflectors as an origin, the four quadrants being divided by two straight lines orthogonal to each other and inclined 45° with respect to a direction in which the incident light is incident on each of the reflectors, light changed in the optical path by each of the reflectors is emitted to a quadrant adjacent to a quadrant on which incident light is incident.