Microlens Array with Variable Focal Length for True Light Field Display
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Solution Overview
Problem
Current 3D display technologies based on parallax principles fail to meet user demands for stereoscopic displays due to contradictions between human eye focus and convergence, leading to dizziness and limited viewing times, as they cannot fully utilize the display area and pixel utilization effectively.
Innovation Solution
A display apparatus featuring a microlens array with focal lengths increasing sequentially from the center to the edge, ensuring the beam width of light emitted from each light-emitting point is less than a preset threshold, thereby improving the display area and viewing angle of true light field displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If parallax type 3D display is used, then stereoscopic display is achieved, but contradiction between human eye focus and convergence causes dizziness and limited viewing time
Solution Approach 1:
The patent changes the optical parameters of the microlens array by varying focal lengths across different regions (center to edge) and adjusting microlens densities. This parameter optimization controls the beam width of light entering the pupil to be less than a preset threshold, thereby resolving the contradiction between achieving stereoscopic display and preventing eye strain and dizziness caused by focus-convergence conflict in traditional parallax 3D displays
Solution Approach 2:
The patent applies local quality by making different regions of the microlens array have different focal lengths and microlens densities. The focal length increases sequentially from the center to the edge, and the density distribution is optimized locally to control light beam width. This local optimization ensures that each region of the display contributes appropriately to forming true light field images that match human visual physiology, eliminating the focus-convergence contradiction while maintaining stereoscopic display capability
2Adaptability or versatility
If traditional microlens array is used, then light field display is achieved, but display area and pixel utilization are not fully utilized
Solution Approach 1:
The patent optimizes the parameter of microlens density distribution across the array, increasing density from center to edge. This parameter change allows more light beams to be directed into the viewer's pupil from edge regions, fully utilizing the display area and improving pixel utilization while maintaining true light field display capability
Solution Approach 2:
The patent introduces asymmetry in the microlens array design by making the focal length and density vary asymmetrically from the center to the edge. This asymmetric design matches the human visual system's characteristics and ensures that the display area is fully utilized, overcoming the limitation of traditional symmetric microlens arrays that waste edge display area
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
This design enhances the display area and viewing angle of true light field displays, increasing pixel utilization and reducing eye strain, thus providing a more effective and comfortable stereoscopic viewing experience.
Implementation Method 1
a microlens array provided on the first side of the display screen, the microlens array includes multiple microlenses arranged in an array... focal lengths of the multiple microlenses increase sequentially from the center of the microlens array to the edge of the microlens array, so that a beam width of the light that is emitted from each light-emitting point of the display, transmits through the microlens array and is incident into a pupil of a human eye is less than a preset threshold
Data Source
AI summary
A display apparatus including: a display screen including multiple light-emitting points and a first side, wherein light generated by the light-emitting points emits from the first side; and a microlens array provided on the first side of the display screen, the microlens array includes multiple microlenses arranged in an array, an orthographic projection of the microlens array on the display screen covers the display screen, and the display screen is provided on a focal surface of the microlens array. The focal lengths of the multiple microlenses increase sequentially from the center of the microlens array to the edge of the microlens array, so that a beam width of the light that is emitted from each light-emitting point of the display, transmits through the microlens array and is incident into a pupil of a human eye is less than a preset threshold.