Micro-lensed LED Emission Angle Control
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Solution Overview
Problem
Current semiconductor light emitting devices face challenges in efficiently managing the emission angle of light, which affects the performance and efficiency of light emitting diodes (LEDs) in electronic displays.
Innovation Solution
The implementation of a micro-lensed light emitting device structure, which includes a backplane with LEDs encapsulated by a micro-lens layer to reduce the emission angle of light, enhancing light collimation and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are used in electronic displays, then light emission is achieved, but the emission angle of light is difficult to control
Solution Approach 1:
A micro-lens array is introduced as an intermediary component between the LEDs and the display surface. Each micro-lens is positioned directly over a corresponding LED and has a curvature designed to refract and collimate the light, thereby controlling the emission angle without modifying the LED itself
Solution Approach 2:
The curvature radius of the micro-lenses is specifically optimized based on the LED pitch and desired emission angle. By adjusting the geometric parameters of the micro-lens array, the light emission characteristics are controlled to achieve narrow viewing angles while maintaining high luminance
2Illumination intensity
If light emission is increased, then luminance is improved, but light scattering increases
Solution Approach 1:
The micro-lens array acts as an optical intermediary that redirects scattered light into collimated beams. The lenses capture light that would otherwise scatter in multiple directions and refract it into controlled trajectories, converting harmful scattering into useful directional emission
Solution Approach 2:
The spherical curvature of the micro-lenses is specifically designed to match the point source characteristics of the LEDs. This curvature geometry naturally focuses and collimates the emitted light, reducing scattering while enhancing luminance in the desired viewing direction
3Manufacturing precision
If LED pitch is reduced for higher resolution, then display resolution is improved, but light emission efficiency decreases
Solution Approach 1:
The micro-lens array is segmented into individual lenses corresponding to each LED, with each lens independently optimized for its specific LED. This segmentation allows the optical system to maintain high efficiency even when LEDs are closely spaced, as each micro-lens processes light from its corresponding LED without interference from adjacent LEDs
Solution Approach 2:
The micro-lens parameters (curvature radius, thickness, material) are scaled and optimized according to the LED pitch. For smaller pitch applications, the micro-lenses are designed with corresponding adjustments in their geometric parameters to maintain optimal light collection and collimation efficiency
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 improves light collimation and increases the lumen to irradiance ratio, leading to more efficient light emission and improved display performance.
Implementation Method 1
micro-lenses disposed on the encapsulation layer and configured to reduce an emission angle of light emitted from the LEDs
Data Source
AI summary
A micro-lensed, light emitting device including, a backplane, light emitting diodes (LEDs) disposed on the backplane, an encapsulation layer encapsulating the LEDs, and micro-lenses disposed on the encapsulation layer and configured to reduce an emission angle of light emitted from the LEDs.