Multi-Layer Lens Assembly for HMD Convergence-Accommodation Mismatch
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Solution Overview
Problem
Head-mount Displays (HMDs) often cause viewer discomfort due to misalignment of eye convergence and accommodation, and generating multiple view points to address this can decrease resolution and affect display quality.
Innovation Solution
A display apparatus incorporating a display panel, a lens assembly with two layers of lenses, and a polarization converting unit, which uses spatial and time light splitting to generate multiple view points on the pupil plane, enhancing resolution while maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple view points are generated using spatial light splitting, then viewer comfort is improved, but resolution decreases
Solution Approach 1:
The lens assembly is divided into multiple lens layers (first lens layer, second lens layer, third lens layer) with different functions. The first and second lens layers generate multiple view points for comfort, while the third lens layer maintains image quality and resolution. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent introduces a temporal dimension by alternately providing first and second polarized image beams during different time periods. This time-based light splitting generates multiple view points without spatially dividing the image, thereby maintaining resolution while achieving viewer comfort through temporal multiplexing.
2Reliability
If more view points are generated, then convergence and accommodation alignment is improved, but display quality is affected
Solution Approach 1:
The display apparatus periodically alternates between providing first polarized image beams and second polarized image beams. This periodic temporal light splitting creates multiple view points over time, improving convergence and accommodation alignment while maintaining display quality through the use of polarization filtering and sequential image presentation.
Solution Approach 2:
The polarization converting unit acts as an intermediary between the display panel and lens assembly. It converts light polarization states to enable temporal light splitting, allowing multiple view points to be generated without directly compromising the image quality from the display panel.
3Ease of operation
If spatial light splitting is used to generate multiple view points, then viewer comfort is enhanced, but resolution is reduced
Solution Approach 1:
The patent merges spatial light splitting (first and second lens layers) with temporal light splitting (alternating polarized beams). This combination allows the system to achieve the benefits of multiple view points for comfort while the third lens layer and polarization filtering preserve resolution by reconstructing high-quality images from the temporally separated beams.
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 provides a high-resolution image to the viewer under a comfortable viewing environment by effectively managing eye convergence and accommodation through the generation of multiple view points.
Implementation Method 1
The first lens layer includes a plurality of first lenses. The second lens layer includes a plurality of second lenses respectively aligned with the first lenses.
Implementation Method 2
A plurality of first polarized image beams is provided during a first time period to generate a first view point set. A plurality of second polarized image beams is provided during a second time period to generate a second view point set.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a display panel, a lens assembly, and a polarization converting unit. The lens assembly includes a first lens layer and a second lens layer. The first lens layer includes a plurality of first lenses. The second lens layer includes a plurality of second lenses. The second lenses are respectively aligned with the first lenses. The polarization converting unit is located between the display panel and the lens assembly. A displaying method is also provided.