Light Source Assembly with Concave Lens for Chromatic Aberration Correction
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Solution Overview
Problem
Chromatic aberration occurs in micro-projector light machines used for augmented reality glasses due to different refractive indexes for various wavelengths of light, causing colors to converge at different focal points, which is not effectively addressed by existing technologies.
Innovation Solution
A light source assembly comprising a circuit substrate with micro light-emitting elements, a patterned colloidal layer, a convex lens layer, and a concave lens layer, where the concave lens layer is used to eliminate optical path differences by covering each convex lens, ensuring that light of different colors converges to a single focal point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a convex lens is used to focus light from light-emitting elements, then light convergence is achieved, but chromatic aberration occurs causing different colors to converge at different focal points
Solution Approach 1:
The patent divides the single lens system into multiple lens layers (convex lens layer and concave lens layer), each with different refractive index characteristics. The convex lens layer focuses light while the concave lens layer compensates for chromatic aberration, achieving both light convergence and color correction through segmented optical components.
Solution Approach 2:
The patent uses composite lens structures with different materials having different refractive indexes. The convex lens layer and concave lens layer are made from materials selected to have complementary dispersion characteristics, allowing the composite lens system to simultaneously achieve light focusing and chromatic aberration correction.
2Object-affected harmful factors
If multiple lens elements are added to correct chromatic aberration, then image quality improves, but device complexity increases
Solution Approach 1:
The patent combines multiple lens elements into integrated lens layers where the convex lens layer and concave lens layer are positioned in fixed relative arrangements. This merging approach maintains the corrective function while reducing the number of independently adjustable components, thereby simplifying the overall device structure.
Solution Approach 2:
The lens layers are designed to perform multiple functions simultaneously: the convex lens layer provides light convergence while the concave lens layer provides chromatic aberration correction. This multi-functionality is achieved through the specific refractive index relationships and geometric arrangements of the lens elements.
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 reduces chromatic aberration, allowing for a compact, lightweight, and comfortable display device with improved image convergence, eliminating the need for complex lens arrangements.
Implementation Method 1
Since the convex lens has different refractive indexes for different wavelengths of light (that is, different colors), after passing through the convex lens, different colors of light converge at different focal points on an optical axis of the convex lens
Data Source
AI summary
A light source assembly, a method for making same, and a display device using same are disclosed. The light source assembly includes a circuit substrate, an opaque and light-reflecting colloidal layer on the circuit substrate, micro light-emitting elements electrically connected to the circuit substrate, a base layer, a layer of convex lenses, and a layer of immediately-adjacent concave lenses. The colloidal layer defines grooves. At least two micro light-emitting elements each emitting light of a different color are arranged in each groove. The base layer is infilled into each groove and covers each micro light-emitting element. Each groove is covered by a convex lens which converges the emitted light. Each concave lens, covering one convex lens, substantially corrects optical path deviations of light of different wavelengths (that is, different colors), so reducing chromatic aberrations.