Meta Lens Display Device with Refractive Diffractive Layers
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Solution Overview
Problem
Current display devices, particularly head-mounted displays, face challenges in achieving improved luminous efficiency due to the optical distance and thickness of traditional lens systems, which affect the overall thickness and light distribution.
Innovation Solution
The integration of a functional layer with a refractive layer and a diffractive layer, along with a meta lens, reduces the optical distance between the display panel and the lens member, minimizing the overall thickness and enhancing luminous efficiency by converting wide emission distributions into narrow ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a traditional lens system is used in head-mounted displays, then the optical distance and thickness are reduced, but the luminous efficiency deteriorates
Solution Approach 1:
The lens system is segmented into multiple functional layers including a refractive layer with first patterns (prisms or lenticular lenses) and a diffractive layer with second patterns (grating structures). Each layer performs a specific optical function to collectively achieve narrow beam convergence while maintaining luminous efficiency
Solution Approach 2:
The functional layer combines refractive and diffractive optical elements in a composite structure. The refractive layer uses materials with specific refractive indices to bend light, while the diffractive layer uses periodic patterns to diffract light, creating a synergistic effect that narrows the emission distribution
2Length of stationary object
If the functional layer is disposed close to the display panel, then the overall thickness is reduced, but the light distribution control becomes more difficult
Solution Approach 1:
The functional layer features locally varied optical properties through patterns with different geometries, orientations, and densities at different locations. This allows precise control of light distribution in specific regions while maintaining overall compactness
Solution Approach 2:
The patent introduces vertical layering with multiple functional layers (refractive and diffractive) stacked in the thickness direction. This dimensional arrangement enables complex light manipulation functions that would require much larger lateral dimensions in a single-layer system
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 configuration reduces the overall thickness of the display device and improves luminous efficiency by optimizing light transmission, resulting in a more effective and compact display system.
Implementation Method 1
a refractive layer disposed on the first protective layer and including a plurality of first patterns
Implementation Method 2
a diffractive layer disposed on the second protective layer and including a plurality of second patterns spaced apart from each other at an interval
Data Source
AI summary
A display device includes a display panel including a plurality of sub-pixel areas, a functional layer disposed on a surface of the display panel and including: a first protective layer, a refractive layer disposed on the first protective layer and including a plurality of first patterns, a second protective layer disposed on the refractive layer, a diffractive layer disposed on the second protective layer and including a plurality of second patterns spaced apart from each other at an interval, and a lens member disposed on a side of the functional layer and including a meta lens.