Head Mounted Display Lens Array with Variable Focal Lengths
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Solution Overview
Problem
Current head-mounted display devices for augmented and virtual reality struggle to provide clear and immersive visual experiences due to limitations in display quality and optical design, particularly in overlapping focal lengths and pixel coverage by lenses.
Innovation Solution
A head-mounted display device with a display panel and lens array featuring a first lens with a smaller focal length and curvature than a second lens, both overlapping multiple pixels, and utilizing reactive compounds and liquid crystal molecules to adjust optical properties, allowing for improved image clarity and increased viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single focal length is used for all lenses in the lens array, then the device structure is simple, but the display quality and image clarity deteriorate due to focal length deviations across different viewing angles
Solution Approach 1:
The patent applies local quality by dividing the lens array into different regions (central part and peripheral part) with different focal lengths. The first lens at the central part has a first focal length, while the second lens at the peripheral part has a second focal length that is longer than the first focal length. This local differentiation compensates for focal length deviations caused by viewing angles, thereby improving display quality and image clarity without requiring complete redesign of the entire optical system.
2Adaptability or versatility
If each lens overlaps only one pixel, then the optical design is simple, but the viewing angle and immersive experience are limited
Solution Approach 1:
The patent implements merging by configuring each lens to overlap multiple pixels (at least two pixels) rather than one-to-one correspondence. The first lens at the central part and the second lens at the peripheral part both overlap multiple pixels on the display panel. This merging approach increases the viewing angle and provides a more immersive virtual reality experience by allowing each lens to contribute to a broader visual field.
3Manufacturing precision
If the curvature and thickness of all lenses are uniform, then the manufacturing process is simplified, but the ability to reduce focal length deviations and enhance display quality is compromised
Solution Approach 1:
The patent applies local quality by specifying that the first lens at the central part has a first curvature, while the second lens at the peripheral part has a second curvature that is smaller than the first curvature. Additionally, the first lens has a first thickness that is greater than the second thickness of the peripheral lens. These local variations in curvature and thickness are designed to compensate for focal length deviations across different viewing angles, thereby improving display quality while maintaining a relatively straightforward manufacturing process.
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 enhances display quality by reducing focal length deviations and increasing the viewing angle, providing a more immersive and clear virtual reality experience for users.
Implementation Method 1
a lens array on the display panel, wherein the lens array includes a first lens on the central part and a second lens on the peripheral part; a first focal length of the first lens is smaller than a focal length of the second lens
Implementation Method 2
each of the first lens and the second lens may include reactive compounds and liquid crystal molecules
Data Source
AI summary
A display device includes: a display panel having a central part and a peripheral part surrounding the central part, the display panel comprising a plurality of pixels; and a lens array on the display panel, wherein: the lens array comprises a first lens on the central part and a second lens on the peripheral part; a first focal length of the first lens is smaller than a second focal length of the second lens; and each of the first lens and the second lens overlaps at least two pixels among the plurality of pixels.