Fresnel Lens Phase Distribution for Stereoscopic Display Clarity
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Solution Overview
Problem
Conventional stereoscopic display devices with lenticular lenses impose restrictive viewing conditions, leading to blurry or out-of-focus images if the observer's distance and interpupillary distance do not match the optimum values.
Innovation Solution
A display device incorporating a Fresnel lens with a phase distribution function that includes a quadratic term and cosine harmonics, allowing for symmetrical light concentration and minimizing crosstalk, enabling clear three-dimensional image perception without the need for specific viewing distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lenticular lens with spherical or parabolic phase distribution is used, then the lens can refract light to separate images for left and right eyes, but the images become blurry or out of focus when the observer does not maintain specific viewing distances and interpupillary distances
Solution Approach 1:
The patent changes the phase distribution function from conventional spherical or parabolic forms to a Fresnel phase distribution with specific mathematical formulation. This parameter change in the optical function enables the lens to maintain focus across varying viewing distances, resolving the contradiction between image clarity and viewing distance flexibility
Solution Approach 2:
The Fresnel lens design creates dynamic light concentration patterns that adapt to different viewing conditions. The phase distribution function is designed to concentrate light rays at multiple positions along the optical axis, allowing the system to maintain image quality whether the observer is close or far from the display panel
2Adaptability or versatility
If a Fresnel lens with complex phase distribution function is used to enable flexible viewing distances, then viewing distance flexibility is improved, but the lens design and manufacturing complexity increases
Solution Approach 1:
The Fresnel lens is divided into multiple zones with different phase characteristics. The phase distribution function is segmented into distinct regions that each handle specific light ray paths, making the complex optical function manageable through zonal segmentation while maintaining overall flexibility
Solution Approach 2:
The patent introduces a specific mathematical phase distribution function as an intermediary between the display panel and the observer's eyes. This function acts as a mediator that transforms the light field in a controlled manner, enabling flexible viewing without requiring complex mechanical adjustments or multiple lenses
3Reliability
If light rays are concentrated at multiple positions on the display panel, then image clarity is improved through reduced crosstalk, but the light intensity distribution becomes non-uniform with peaks at concentrated positions
Solution Approach 1:
The lens is designed with local quality variations through its phase distribution function, where different regions of the lens concentrate light at different positions. This local optimization allows each zone to contribute to image clarity at its specific concentration point, with the overall system achieving clear images through the combination of localized light concentration zones
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 enhanced light concentration and reduced crosstalk, resulting in clearer three-dimensional image perception for users, regardless of the observer's position, compared to traditional spherical or parabolic phase distribution systems.
Implementation Method 1
a lens overlapping the display panel and configured to refract at least a portion of a collimated light
Implementation Method 2
The lens may be configured to concentrate the first plurality of rays to a first position on a surface of the display panel such that the first position has a first light intensity
Data Source
AI summary
A display device includes a display panel for displaying an image. The display device further includes a lens configured to refract at least a portion of a collimated light having a center ray, a first outermost ray, a second outermost ray, a first plurality of rays between the first outermost ray and the center ray, and a second plurality of rays between the second outermost ray and the center ray. The lens may concentrate the first plurality of rays such that a first position on the display panel has a first light intensity. The lens may concentrate the second plurality of rays such that a second position on the display panel has a second light intensity. Each of the first light intensity and the second light intensity is substantially greater than a center light intensity on the display panel corresponding to at least the center ray.