Variable Phase Retarder Segmentation for VR Vergence-Accommodation Conflict
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Solution Overview
Problem
Existing virtual reality devices face issues with vergence-accommodation conflicts, particularly in time division multiplexing solutions, leading to near and far light field conflicts.
Innovation Solution
A display system incorporating a controller, display panel, and variable phase retarder with sub-display regions and sub-backlight regions, where the variable phase retarder changes states to transmit different polarized lights, controlled by a controller with synchronized drive signals to avoid conflicts and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time division multiplexing solution is adopted for single screen and multiple focal planes, then vergence-accommodation conflicts are addressed, but near and far light field conflicts occur
Solution Approach 1:
The display panel is divided into multiple sub-display regions (first sub-display region, second sub-display region, etc.), each corresponding to a different focal plane. The backlight unit is segmented into multiple sub-backlight regions, and the variable phase retarder is divided into multiple sub-phase retarders. This segmentation allows independent control of different focal planes, enabling the system to display multiple focal planes simultaneously without light field conflicts.
Solution Approach 2:
The variable phase retarder dynamically changes its phase retardation state in response to control signals from the controller. By adjusting the phase retardation angle of each sub-phase retarder independently, the system can switch between different focal planes dynamically. This dynamic adjustment allows the same physical display to adapt to different viewing distances and focal requirements without physical reconfiguration.
2Productivity
If variable phase retarder changes state rapidly to achieve high refresh rate, then image quality improves, but control complexity increases
Solution Approach 1:
The variable phase retarder is segmented into multiple sub-phase retarders, each corresponding to a sub-display region. The controller sends control signals to each sub-phase retarder independently, allowing parallel operation and reducing the overall control time. This segmentation enables high refresh rates by processing multiple focal planes simultaneously rather than sequentially.
Solution Approach 2:
The controller pre-calculates and sends control signals to the sub-phase retarders in advance, coordinating their state changes with the backlight switching timing. By preparing the phase retarder states before the actual display update, the system achieves rapid transitions without increasing control complexity during the critical display moment.
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 allows for high refresh rates and improved image quality by synchronizing the phase retarder and backlight regions, reducing conflicts and enhancing the display system's overall performance.
Implementation Method 1
the variable phase retarder is configured to accept light emitted by the display panel and to change a state controlled by the controller to selectively transmit a first polarized light or a second polarized light
Data Source
AI summary
The present disclosure provides a display system, comprising a controller, a display panel and a variable phase retarder; wherein the variable phase retarder comprises sub-phase retarders, and each of the sub-phase retarders corresponds to and is configured to accept light emitted by one of sub-display regions of the backlight unit; the controller comprises a variable phase retarder driver, wherein the variable phase retarder driver is configured to send second drive signals to the variable phase retarder, wherein the second drive signals cause the sub-phase retarders to change state one by one.