Head Mounted Display Lens Segmentation for Aberration Control
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) are bulky, heavy, and expensive due to their complex optical mechanisms, which limit their usability and accessibility, particularly in achieving a wide field of view with minimal volume and weight, and often cause video distortion and dizziness.
Innovation Solution
A lightweight HMD design featuring a first lens unit with prism-shaped lens elements having hemispherical surfaces that refract content in an eyeball direction, accompanied by a content transforming unit to correct for aberration, and optionally a second lens unit with opposite optical characteristics for enhanced image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens with short focal distance is used to achieve wide field of view and high resolution, then the magnification ratio increases, but the aberration becomes very high and the volume of the HMD becomes very large
Solution Approach 1:
The patent divides the single lens into multiple lens elements (first lens element, second lens element, third lens element, fourth lens element) arranged in specific configurations. This segmentation allows each lens element to handle specific optical functions, reducing overall aberration while maintaining compact focal distance and wide field of view.
Solution Approach 2:
Different lens elements are designed with different optical characteristics - the first and second lens elements have positive refractive power while the third and fourth lens elements have negative refractive power. This local differentiation of optical properties allows optimization of specific regions to correct aberrations introduced by short focal distance.
2Measurement precision
If a lens with short focal distance is used to achieve wide field of view, then the magnification ratio increases, but the weight of the HMD increases
Solution Approach 1:
By segmenting the optical system into multiple smaller lens elements rather than one large lens, the patent reduces the overall weight while maintaining the necessary optical power for wide field of view and high resolution.
Solution Approach 2:
The lens elements are strategically positioned and sized to optimize optical performance with minimal material usage, reducing weight while maintaining focal distance and field of view requirements.
3Device complexity
If a single lens is used to achieve wide field of view, then the structure is simple, but the aberration is very high and video distortion occurs
Solution Approach 1:
The patent segments the optical system into multiple lens elements with different refractive powers arranged in specific patterns. This segmentation enables the system to correct aberrations and minimize video distortion while maintaining relatively simple overall structure.
Solution Approach 2:
Different lens elements are designed with specific optical characteristics to address different types of aberrations and distortion in specific regions of the field of view, thereby improving image quality without significantly increasing complexity.
4Measurement precision
If a high-level optical technology is used to realize short focal point and wide field of view, then the resolution increases, but the price of the HMD becomes very high
Solution Approach 1:
By using multiple standard lens elements with different refractive powers rather than requiring complex high-level optical technology, the patent achieves good resolution and wide field of view at lower manufacturing cost.
Solution Approach 2:
The patent optimizes parameters such as the refractive indices and curvatures of individual lens elements to achieve the desired optical performance using readily available materials and manufacturing processes, thereby reducing cost while maintaining resolution.
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 design achieves a compact, lightweight HMD with a wide field of view at a lower cost, minimizing aberration and distortion, making it more practical for everyday use.
Implementation Method 1
a first lens unit configured by a set of lens elements that refract the content displayed on the display unit in an eyeball direction
Data Source
AI summary
A head mounted display and a method of displaying a content using the head mounted display are disclosed. The head mounted display is disclosed which includes: a display unit displaying a content; and a first lens unit configured by a set of lens elements that refract the content displayed on the display unit in an eyeball direction.