Micro-LED Convex Lens and Reflector for Axial Light Convergence
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Solution Overview
Problem
Existing micro light-emitting devices face challenges in efficiently converging light towards the axial direction, particularly when incident light is highly angled, due to limitations in designing suitable micro lenses.
Innovation Solution
The micro light-emitting device incorporates a semiconductor epitaxial structure, a convex lens structure, and a light-reflecting structure. The convex lens structure refracts light, while the light-reflecting structure reflects highly angled light towards the axis, enhancing axial luminous intensity and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro lens is used to converge light in each micro LED, then axial brightness is improved, but highly angled incident light cannot be effectively converged
Solution Approach 1:
The light-reflecting structure is divided into multiple reflective surfaces (first reflective surface, second reflective surface, third reflective surface) that work together to handle different incident light angles. This segmentation allows each surface to be optimized for specific light paths while collectively solving the problem of highly angled light convergence.
Solution Approach 2:
The light-reflecting structure acts as an intermediary element between the micro LED and the external environment. It mediates the interaction between highly angled incident light and the micro LED by reflecting and redirecting light rays, enabling effective light convergence that neither the micro LED alone nor a simple micro lens can achieve.
2Illumination intensity
If the micro lens shape is optimized for axial light convergence, then axial brightness is improved, but the design becomes limited for highly angled incident light
Solution Approach 1:
The light-reflecting structure is integrated with the micro lens structure, combining refractive and reflective light control functions into a unified design. This merging allows the system to handle both axial and highly angled incident light effectively while maintaining a compact form factor, avoiding the need for separate complex optical components.
Solution Approach 2:
The light-reflecting structure serves multiple functions: it reflects highly angled incident light, redirects light rays toward the micro LED, and works in conjunction with the micro lens to optimize overall light convergence. This multi-functionality allows a single structure to address multiple optical challenges simultaneously.
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 effectively improves light convergence and axial luminous intensity, addressing the limitations of prior art and enhancing the performance of micro light-emitting devices in applications such as AR/VR displays.
Implementation Method 1
The convex lens structure refracts light, while the light-reflecting structure reflects highly angled light towards the axis, enhancing axial luminous intensity and light emission
Implementation Method 2
The convex lens structure refracts light, while the light-reflecting structure reflects highly angled light towards the axis, enhancing axial luminous intensity and light emission
Data Source
AI summary
A micro light-emitting device includes a semiconductor epitaxial structure, a convex lens structure, and a light-reflecting structure. The semiconductor epitaxial structure includes a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially stacked in such order. The convex lens structure is disposed on a light-exiting side of the semiconductor epitaxial structure and has a lens bottom connected thereof. The convex lens structure protrudes outward in a direction corresponding to a direction along which light exits. The light-reflecting structure is disposed at an outer surface of the convex lens structure proximate to the lens bottom. The light-reflecting structure having a light-reflecting surface that faces the outer surface of the convex lens structure. A display device includes a driver substrate and a pixel unit including a plurality of the micro light-emitting devices above. The micro light-emitting devices are arranged in an array on the driver substrate.