Light Field Display Lens Arrays for Reduced Visual Fatigue
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Solution Overview
Problem
Existing 3D displaying devices based on parallax cause visual fatigue due to unequal monocular-focusing depth and binocular-convergence depth, leading to dizziness and discomfort.
Innovation Solution
A device for optical-field displaying with a display screen and a lens unit comprising an array of lenses, where light rays from sub-pixels form a view region smaller than a half-pupil region and enter different cone cells, ensuring equal monocular-focusing and binocular-convergence depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallax-based 3D displaying is used, then stereoscopic vision is achieved, but visual fatigue and dizziness occur due to unequal monocular-focusing depth and binocular-convergence depth
Solution Approach 1:
The patent segments the display into multiple pixel islands, each corresponding to a specific viewpoint. Each pixel island emits light rays that pass through specific lenses to reach specific regions of the observer's pupil, enabling different viewpoints to be presented simultaneously to different parts of the eye without causing visual fatigue.
Solution Approach 2:
Different regions of the display screen have different local qualities - each pixel island is optimized for a specific viewpoint and emits light with specific angular characteristics. This local differentiation ensures that each region contributes appropriately to the overall stereoscopic effect while maintaining comfortable viewing conditions.
2Reliability
If multiple viewpoints are presented simultaneously, then natural stereoscopic vision is mimicked, but the view region must be precisely controlled to enter different cone cells
Solution Approach 1:
The patent introduces lenses as intermediary optical elements between the pixel islands and the observer's eye. These lenses control the angular distribution of light rays, ensuring that light from each pixel island passes through the correct lens to reach the appropriate region of the pupil and stimulate the corresponding cone cells, thereby achieving precise view region control.
Solution Approach 2:
The patent controls the angular parameters of light rays emitted by each pixel island. By adjusting the emission angle and directing light through specific lenses, the system precisely controls which regions of the pupil receive light from each viewpoint, enabling accurate stimulation of different cone cells without requiring extreme manufacturing precision.
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
Prevents visual fatigue by allowing simultaneous reception of multiple viewpoints in different cone cells, mimicking natural stereoscopic vision without spinning sensations.
Implementation Method 1
a view region formed by light rays that are emitted by the sub-pixels of the pixel islands and propagated via the corresponding lenses to a human eye
Data Source
AI summary
A device for optical-field displaying includes: a display screen and a lens unit provided on a light exiting side of the display screen; the lens unit includes a plurality of lenses arranged in an array; the display screen is provided on a focal plane of the plurality of lenses; the display screen includes a first substrate and a second substrate that match; the first substrate is a light-exiting-side substrate, the second substrate includes a plurality of pixel islands arranged in an array; the plurality of pixel islands correspond to the plurality of lenses; a view region formed by light rays emitted by the sub-pixels of the pixel islands and propagated via the corresponding lenses to a human eye is smaller than or equal to a half-pupil region, and light rays of different viewpoints emitted by different sub-pixels of the pixel islands enter different cone cells via the lenses.