Dynamic Illumination Control for Stereoscopic Display Defects
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Solution Overview
Problem
Existing display devices that use a parallax barrier or lenticular lens for stereoscopic images face issues with reverse view display defects and excessive optical loss due to uniform light emission, which is not optimized for the viewer's position.
Innovation Solution
A display device with a position information acquiring unit, a separation unit that adjusts the image separator based on viewer position, and an illumination unit that synchronizes the optical axis direction and spread angle of illumination light to match the viewer's position, ensuring efficient light distribution and minimizing unnecessary light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light source emitting light in a wide angle range is used to allow viewers to view the stereoscopic image at various positions, then the adaptability of the display device is improved, but the optical loss increases due to uniform light emission to positions that are not viewed
Solution Approach 1:
The illumination unit dynamically adjusts the optical axis direction and spread angle of illumination light based on the detected viewer position. This dynamic adjustment ensures that light is emitted preferentially toward the actual viewer position rather than uniformly in all directions, thereby reducing optical loss while maintaining adaptability to various viewer positions
Solution Approach 2:
The system changes the parameters of illumination light (optical axis direction and spread angle) according to the viewer's position information. By varying these parameters in response to viewer position, the system optimizes light distribution to match actual viewing conditions, reducing waste light and improving energy efficiency
2Reliability
If the position of the image separator is changed based on the position of the viewer to prevent reverse view, then the display quality is improved, but the device complexity increases due to additional position detection and synchronization mechanisms
Solution Approach 1:
The system uses a camera to detect the viewer's position and feeds this information back to control both the image separator position and the illumination unit. This feedback mechanism ensures that the stereoscopic display remains accurate by continuously adjusting the image separator and illumination parameters based on real-time viewer position information
Solution Approach 2:
The camera serves multiple functions: it detects viewer position for image separator control, determines illumination optical axis direction, and sets illumination spread angle. By using a single detection device for multiple control purposes, the system reduces overall complexity while maintaining display accuracy
Data Source
AI summary
According to an aspect, a display device includes: a position information acquiring unit that acquires position information on a position of a viewer; a separation unit that changes a position of an image separator based on the position information; an illumination unit that changes a direction of an optical axis of illumination light based on the position information of the viewer in synchronization with a timing at which the position of the image separator is changed; and a display unit that modulates the illumination light and displays an image including plural parallax images.