LED Lens Module Biconcave Convex Refraction
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Solution Overview
Problem
Conventional LED packages exhibit uneven light field distribution with high intensity at the center and low intensity at the periphery due to the 120° light output angle of LED dies, necessitating increased LED density and cost to avoid dark bands in backlight modules.
Innovation Solution
An LED package design incorporating a lens module with a biconcave concave lens and a convex lens, where light from the LED die is refracted through the concave lens to distribute symmetrically and then through the convex lens to enhance peripheral light intensity, achieving a wider light field and reduced central intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional LED die with 120° light output angle is used, then LED structure is simple, but light field distribution is uneven with high intensity at center and low intensity at periphery
Solution Approach 1:
A lens module is introduced as an intermediary component between the LED die and the light guide plate. The lens module includes a biconcave lens and a convex lens that work together to refract and redistribute the light from the LED die, transforming the uneven light field distribution into a more uniform pattern with enhanced peripheral illumination.
Solution Approach 2:
The patent changes the optical parameters of the light emission system by using lenses with specific focal lengths and curvature radii. The biconcave lens has a first curvature radius and the convex lens has a second curvature radius, where the ratio between these radii is optimized to achieve the desired light distribution pattern, effectively controlling the light field parameters.
2Illumination intensity
If more LEDs are positioned closer together to reduce distance between neighboring LEDs, then dark bands between LEDs are avoided, but cost increases
Solution Approach 1:
The lens module serves as a light redistributing intermediary that enables fewer LEDs to achieve uniform illumination. By refracting light through the biconcave and convex lenses, the system redistributes light energy more efficiently across the light guide plate, eliminating dark bands without requiring increased LED density.
3Illumination intensity
If LED density is increased to eliminate dark bands, then light field uniformity improves, but manufacturing cost increases
Solution Approach 1:
The lens module is positioned between the LED die and the light guide plate to act as a light redistribution intermediary. This intermediary component refracts light through its biconcave and convex lens structures, achieving uniform light field distribution and eliminating dark bands while maintaining a cost-effective LED density.
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 design results in a more even light distribution with increased light intensity at the periphery, allowing for fewer LED packages to be used in backlight modules and eliminating dark bands, thereby reducing costs while maintaining effective illumination.
Implementation Method 1
light from the LED die is refracted through the concave lens to distribute symmetrically
Implementation Method 2
then through the convex lens to enhance peripheral light intensity
Data Source
AI summary
An LED package includes an LED die and a lens module. The lens module covers the LED die. Light emitted from the LED die travels through the lens module. The lens module includes a concave lens and a convex lens with a smaller radial dimension than that of the concave lens. The concave lens covers the LED die. The convex lens is attached on a center of a surface of the concave lens away from the LED die. Optical axes of the concave lens and the convex lens are both collinear with a central axis of the LED die. Light from the LED die is diverged by the lens module to a peripheral side of the LED package.