Micro LED Lens Structure for Brighter Head-Mounted Displays
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Solution Overview
Problem
Existing micro LED displays for head-mounted displays face challenges in achieving high brightness due to inefficient light utilization and reflection within the display structure.
Innovation Solution
The display device incorporates a substrate with a barrier layer having through holes, where light-emitting diodes are positioned within these holes, and convex lenses are placed above the diodes. The lenses have a convex surface with a height greater than the barrier layer, optimizing light emission and reducing reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting diodes are positioned in through holes of a barrier layer, then light emission is enabled, but light reflection and inefficient light utilization occur
Solution Approach 1:
A lens is introduced as an intermediary component between the light-emitting diode and the external environment. The lens positioned in the through hole of the barrier layer redirects and focuses light rays, mediating the interaction between the LED and surrounding space to reduce reflection and improve light extraction efficiency.
Solution Approach 2:
The lens employs a convex (spheroidal) surface geometry to refract and redirect light rays emanating from the LED. This curved surface configuration optimizes light distribution patterns, reducing internal reflection and enhancing overall light utilization efficiency for improved brightness.
2Ease of manufacture
If a barrier layer with through holes is used to position LEDs, then light emission structure is established, but light reflection increases
Solution Approach 1:
The lens serves as a mediator between the LED and the barrier layer structure, addressing the harmful reflection effect generated by the through-hole configuration while preserving the ease of LED positioning provided by the barrier layer.
3Loss of energy
If lenses with convex surfaces are positioned above LEDs, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The lens is integrated directly into the through hole of the barrier layer, merging multiple functions (LED positioning, light extraction enhancement, and reflection reduction) into a single unified structure. This combination approach improves light efficiency while minimizing the increase in device complexity.
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 enhances light efficiency by minimizing reflection and maximizing the use of emitted light, resulting in a brighter image display for head-mounted displays.
Implementation Method 1
lenses positioned in the through holes in the barrier layer such that each of the lenses has a first surface opposed to the substrate and a convex surface on a second surface
Implementation Method 2
light-emitting diodes positioned in the through holes in the barrier layer, respectively
Data Source
AI summary
A display device includes a substrate, a barrier layer, light-emitting diodes, and lenses. The barrier layer is provided on the substrate. The barrier layer has through holes. The light-emitting diodes are disposed in the through holes. The lenses is disposed at positions of the through holes. Each of the lenses has a first surface and a second surface, the second surface is a convex surface, and height of a top of the convex surface based on the substrate is greater than a height of an upper surface of the barrier layer based on the substrate. The first surface is opposed to the substrate with the light-emitting diode therebetween. The second surface is a back of the first surface.