Parallax Barrier Display Device for Extended Viewing Zone
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Solution Overview
Problem
Naked eye stereoscopic image display devices have a limited stereoscopic viewing zone in the depth direction, as they do not account for observer movement perpendicular to the screen, resulting in a narrow viewing area.
Innovation Solution
An image display device and method that adjust the number of divisions in the time division parallax barrier method based on observer distance, using a liquid crystal panel with subpixels and a control device to change the barrier pattern and image arrangement on a second display surface, allowing for extended stereoscopic viewing zones by varying the intervals between slits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a fixed parallax barrier pattern is used, then the device structure is simple, but the stereoscopic viewing zone is narrow in the depth direction
Solution Approach 1:
The patent applies dynamics by making the parallax barrier pattern changeable over time. The control device dynamically adjusts the barrier pattern based on the observer's distance from the display, switching between different patterns to extend the stereoscopic viewing zone in the depth direction. This resolves the contradiction by allowing the structure to adapt its configuration rather than being fixed.
Solution Approach 2:
The patent changes the parameter of the barrier pattern (specifically the slit positions and configurations) based on observer distance. By varying the barrier pattern parameters according to the z-coordinate distance, the system extends the viewing zone depth while maintaining manageable device complexity through controlled parameter adjustment.
2Length of moving object
If the number of time divisions is increased, then the viewing zone is extended, but the screen luminance decreases and power consumption increases
Solution Approach 1:
The system dynamically adjusts the number of time divisions based on the observer's distance. When the observer is farther away, more time divisions are used to extend the viewing zone. When closer, fewer time divisions are used to maintain luminance and reduce power consumption. This dynamic adaptation resolves the contradiction between viewing zone extension and energy efficiency.
Solution Approach 2:
The patent changes the parameter of time division count based on observer distance (z-coordinate). By adjusting this parameter according to viewing conditions, the system optimizes the balance between extending the viewing zone and managing power consumption, using more divisions only when necessary for distant observers.
3Length of moving object
If the barrier pattern is changed frequently, then the viewing zone is extended, but image quality deteriorates with noticeable flickering
Solution Approach 1:
The system dynamically changes the barrier pattern at controlled timing based on observer distance, rather than frequently or continuously. The switching timing is optimized to prevent noticeable flickering while still achieving viewing zone extension, making the transition dynamic but controlled.
Solution Approach 2:
The patent uses periodic time-division multiplexing to display different barrier patterns in alternating time slots. This periodic switching, synchronized with the display refresh rate and optimized for the observer's distance, allows viewing zone extension while maintaining image quality by preventing perceptible flickering through proper timing.
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 extends the stereoscopic viewing zone in the depth direction, improving the ratio of screen luminance to power consumption and maintaining image quality without noticeable flickering, allowing for a wider range of observer positions to experience stereoscopic viewing.
Implementation Method 1
a liquid crystal panel with subpixels and a control device to change the barrier pattern
Data Source
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AI summary
A image display device is provided that displays a stereoscopic image based on a parallax barrier method. The image display device includes a plurality of display elements disposed in an image display surface of a transmission type, a plurality of illumination disposition control elements disposed on an illumination disposition surface that allows variable control of the disposition of illumination light radiated to the image display surface with respect to the image display surface, and a control unit configured to control the display elements and control the illumination disposition control elements. The control unit includes a position information acquisition unit configured to acquire position information indicating an observer distance, a division number calculation unit configured to calculate the number of divisions of each of a left image region and a right image region out of the image display surface, based on the observer distance, an image display surface control unit configured to change the number of divisions, and an illumination disposition surface control unit configured to change the disposition of each of a barrier region and a slit region out of the illumination disposition surface, based on the number of divisions, while maintaining a width of the slit region to be a width before the number of divisions is changed.