Light Field Display Sub-Pixel Alignment for Convergence Conflict
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Solution Overview
Problem
Current near-eye 3D display technologies often cause convergence conflict, leading to visual fatigue and dizziness due to inconsistent monocular focusing and binocular convergence planes.
Innovation Solution
A light field display apparatus featuring a display panel with closely spaced sub-pixel strips and a lens structure that ensures each sub-pixel's view region aligns with the pupil diameter, allowing for simultaneous binocular convergence and monocular focusing on the same plane, using a micro lens array and cylindrical lenses to collimate light and create a seamless 3D visual space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 3D display technology is used to form stereoscopic vision by displaying different images to left and right eyes, then 3D display effect is achieved, but convergence conflict occurs causing visual fatigue and dizziness
Solution Approach 1:
The display panel is divided into multiple pixel islands, with each pixel island containing sub-pixels that emit light in specific directions. The lens array further segments the light paths, directing light from different pixel islands to different spatial locations. This segmentation enables multiple viewpoints and directions simultaneously, allowing the human eye to focus on different depths while maintaining convergence alignment, thus resolving the convergence conflict that causes visual fatigue and dizziness.
Solution Approach 2:
The patent transitions from conventional 2D display to light field display by adding spatial dimensionality. Multiple pixel islands emit light in different directions and depths, creating a three-dimensional light distribution. The lens array maps these light rays to corresponding spatial positions, enabling the human eye to perform monocular focusing at different depths while maintaining binocular convergence alignment, thereby eliminating convergence conflict.
2Manufacturing precision
If sub-pixel spacing is reduced to ≤2 μm to improve resolution and reduce moire effects, then display quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The display panel is divided into multiple pixel islands with sub-pixels spaced ≤2 μm apart within each island. This segmentation allows the use of closely spaced sub-pixels in controlled regions while maintaining overall display quality. The lens array further segments the light paths, ensuring that the close spacing does not cause moire effects but rather improves resolution by enabling finer angular discrimination.
3Ease of operation
If lens aperture is optimized to match pixel island projection width, then view region control is improved, but device complexity increases
Solution Approach 1:
Each lens in the lens array is configured with specific aperture dimensions that match the orthographic projection width of its corresponding pixel island. This local optimization ensures that light from each pixel island is directed to the correct spatial location with precise view region control. The one-to-one correspondence between pixel islands and lenses simplifies the overall configuration while maintaining high precision in view region management.
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 effectively eliminates visual fatigue by ensuring monocular focusing and binocular convergence are aligned, providing a seamless and immersive 3D experience with reduced interference and moire effects.
Implementation Method 1
a lens structure, located on a side of the light-transmitting spacer layer facing away from the display panel, where the lens structure includes a plurality of lenses arranged in an array
Implementation Method 2
the lens structure includes: a lens layer located on the side of the light-transmitting spacer layer facing away from the display panel, a flat layer located on a side of the lens layer facing away from the display panel, and a first substrate located on a side of the flat layer facing away from the display panel, wherein the lens layer includes the plurality of lenses arranged in an array, and a refractive index of the lens layer is larger than a refractive index of the flat layer
Data Source
AI summary
A display panel includes a plurality of sets of pixel strips extending in a first direction and arranged in a second direction, each set of pixel strips includes a plurality of sub-pixel strips in different colors, spacing between every two adjacent sub-pixels in each sub-pixel strip in the first direction is smaller than or equal to 2 μm, each set of pixel strips is divided into a plurality of pixel islands arranged in an array in the first direction, each pixel island includes at least four sub-pixels extending in the first direction in each corresponding sub-pixel strip, a width of a view region formed by light emitted by each sub-pixel in each pixel island being propagated to a human eye through a corresponding lens is smaller than or equal to a pupil diameter.