In-Vehicle Image Display Light Guiding Plates for Crosstalk Reduction
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Solution Overview
Problem
Conventional image display apparatuses suffer from narrow observation ranges, crosstalk, and uneven illumination, especially when observers move outside the designated areas, and they struggle with large angle image separation, which leads to increased aberration and illumination unevenness.
Innovation Solution
The apparatus employs a configuration with a first and second light guiding plate, where the first light guiding plate projects light only in one direction and the second light guiding plate projects light in another direction, using optically flat parts and slope portions to ensure light is directed correctly, reducing crosstalk and unevenness, and allowing for high-quality image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time sharing illumination is used to display images for different viewing directions, then stereoscopic display is achieved, but the observation range becomes narrow and crosstalk occurs when observers move outside designated areas
Solution Approach 1:
The patent divides the single light source into multiple light sources arranged in a matrix configuration, with each light source corresponding to specific viewing directions. This segmentation allows different light sources to be independently controlled for different observation areas, expanding the effective observation range while maintaining stereoscopic display quality.
Solution Approach 2:
The patent transitions from one-dimensional time-sharing illumination to two-dimensional spatial illumination by arranging light sources in a matrix pattern. This dimensional change enables simultaneous illumination for multiple viewing directions across different spatial zones, thereby expanding the observation range without sacrificing stereoscopic effect.
2Adaptability or versatility
If large angle image separation is implemented to expand observation range, then more viewing directions are covered, but aberration increases and illumination becomes uneven
Solution Approach 1:
The patent assigns different optical characteristics to different regions of the light source matrix. Each light source or group of light sources is optimized for its specific viewing direction, with adjustable emission patterns and intensities. This local optimization maintains image quality and illumination uniformity across different viewing angles without requiring large angle separation that would cause aberration.
Solution Approach 2:
The patent employs dynamic control of light source intensities and emission patterns based on the desired viewing direction. By dynamically adjusting which light sources are active and their respective intensities, the system achieves flexible viewing angle coverage while maintaining consistent image quality and avoiding the aberration problems associated with fixed large-angle separation.
3Adaptability or versatility
If multiple light sources are used to expand observation range, then more viewing directions are supported, but device complexity increases
Solution Approach 1:
The patent designs the light source matrix and control system to serve multiple functions simultaneously. The same matrix configuration supports both stereoscopic display and expanded observation range, while the control system handles both temporal switching and spatial distribution. This multi-functionality reduces the need for separate systems for each feature, thereby limiting the increase in device complexity.
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 effectively reduces crosstalk and illumination unevenness, enabling high-quality image display with improved observation ranges and reduced aberration, while maintaining low costs.
Implementation Method 1
a first light guiding plate which projects the first light flux emitted from the first light source only in a direction to the first observer; and a second light guiding plate which projects the second light flux emitted from the second light source only in a direction to the second observer
Data Source
AI summary
An image display apparatus has one display screen configured to display images corresponding to a plurality of observers. The image display apparatus includes illumination unit for emitting a first light flux and a second light flux in at least two different directions in a time sharing manner, and a transmissive display element configured to display in a time sharing manner a first image using the first light flux as illumination light and a second image using the second light flux as illumination light. The illumination unit includes a first light source which emits the first light flux, a second light source which emits the second light flux, a first light guiding plate which projects the first light flux only in a direction to a first observer, and a second light guiding plate which projects the second light flux only in a direction to a second observer.