Autostereoscopic Display Parallax Barrier Slit Correction
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Solution Overview
Problem
Autostereoscopic video display devices face challenges in achieving desired brightness while minimizing crosstalk, as increasing slit width to enhance brightness tends to increase crosstalk, and reducing the number of time divisions to suppress crosstalk results in lower image brightness.
Innovation Solution
An image display system using a parallax barrier scheme with a variable number of time divisions, where the arrangement patterns for left and right eye images are controlled based on subpixel units, and the positions of slits in the barrier pattern are corrected using distance information to optimize the relative positional relationship between the slits and the observer's eyes, allowing for a slit width larger than zero but smaller than a subpixel for effective crosstalk suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the slit width in the barrier pattern is increased to enhance brightness, then the display brightness is improved, but the crosstalk between left and right eyes increases
Solution Approach 1:
The patent applies dynamics by making the barrier pattern movable rather than fixed. The barrier pattern is shifted in the vertical direction according to the observer's eye position, allowing the system to adapt to different viewing conditions. This dynamic adjustment enables the slits to maintain optimal alignment with the observer's eyes, achieving both high brightness and crosstalk suppression simultaneously
Solution Approach 2:
The patent changes the parameter of slit width to be larger than conventional designs (while still smaller than subpixel width) and adjusts the vertical position of the barrier pattern based on eye position. By modifying these parameters dynamically, the system achieves improved brightness without excessive crosstalk, resolving the traditional trade-off between these two factors
2Object-generated harmful factors
If the number of time divisions is reduced to suppress crosstalk, then the crosstalk is minimized, but the image brightness decreases
Solution Approach 1:
The patent uses dynamics by continuously adjusting the vertical position of the barrier pattern according to the observer's eye position. This real-time adaptation allows the system to maintain effective optical separation with fewer time divisions, thereby reducing crosstalk while preserving image brightness that would otherwise require more time divisions to achieve
Solution Approach 2:
The patent implements feedback by detecting the observer's eye position and using this information to adjust the barrier pattern position accordingly. This feedback mechanism enables the system to optimize performance for each observer, achieving low crosstalk and high brightness simultaneously by adapting to individual viewing conditions
3Device complexity
If the barrier pattern position is fixed, then the device complexity is reduced, but the adaptability to different observer positions is poor
Solution Approach 1:
The patent applies dynamics by making the barrier pattern position variable rather than fixed. The system vertically shifts the barrier pattern based on detected eye position, enabling adaptation to different observers and viewing conditions. This dynamic approach maintains relatively simple device architecture while significantly improving adaptability
Solution Approach 2:
The patent achieves universality by designing a single barrier pattern that can serve multiple observers at different positions through vertical shifting. Rather than requiring separate barrier patterns or complex multi-layer structures for different viewing conditions, the system uses one adaptable barrier pattern that can be positioned to accommodate various eye positions, thereby achieving multi-functionality with minimal added 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 approach enables the image display system to maintain desired brightness while reducing crosstalk, improving the luminance-to-power ratio by setting the number of time divisions to less than four, ensuring both high brightness and minimal interference between the left and right eyes.
Implementation Method 1
a parallax barrier scheme in which a plurality of stereoscopic display images are sequentially presented in a predetermined order according to a predetermined time series with a predetermined period
Implementation Method 2
a diffuser provided between the backlight and the image display panel and having directivity in a direction with a predetermined polar angle with polar coordinates
Data Source
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AI summary
An image display device acquires positional information including a distance between at least one eye of an observer and an image display surface, and corrects, based on the acquired positional information, a relative positional relationship between slit areas and an image displayed on the image display surface, by using a width smaller than the width of one subpixel as a minimum correction unit.