Orthogonal-Axis Lens Structure for Uniform LED Backlight Emission
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Solution Overview
Problem
Optical interference between light emitting diodes in display devices and lighting systems leads to shadows and hot spots, which existing technologies have not adequately addressed.
Innovation Solution
A light emitting module with a lens that includes a light entering part and a light exiting part, both with major and minor axes, where the major axis of the entering part is orthogonal to the major axis of the exiting part, featuring a light incident vertical surface and an inclined surface, and a flange connecting the exiting part to the lens, designed to minimize optical interference by optimizing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting diodes are used in display devices or lighting systems, then the light output and illumination coverage are improved, but optical interference between the light emitting diodes occurs causing shadows and hot spots
Solution Approach 1:
The patent introduces a lens as an intermediary optical element between the light emitting diodes and the illuminated surface. This lens mediates the light propagation by refracting and redistributing the light rays, preventing direct optical interference between adjacent LEDs while maintaining high light output. The lens acts as a mediator that transforms the problematic direct light paths into controlled refraction paths.
Solution Approach 2:
The patent applies local quality by creating spatially varying optical properties through the lens structure. Different regions of the lens have different refractive characteristics that are optimized for their specific positions relative to multiple LEDs. This local optimization allows each region to handle light from specific LEDs in a way that prevents interference while maintaining overall uniform illumination.
2Area of stationary object
If the number of light emitting diodes is increased to improve illumination coverage, then the light distribution area is expanded, but optical interference and hot spots become more severe
Solution Approach 1:
The lens serves as an intermediary that manages light from multiple LEDs across the illumination area. It refraction light rays to redistribute them uniformly across the target surface, preventing the formation of shadows and hot spots even when many LEDs are used to expand coverage.
Solution Approach 2:
The patent addresses the two-dimensional problem of light distribution by introducing optical manipulation in three-dimensional space through the lens. The lens operates in the third dimension (optical path space) to control light propagation, transforming the planar illumination problem into a volumetric optical control solution that eliminates interference patterns.
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 minimizes optical interference, ensuring uniform light emission and reducing shadows or hot spots, thereby enhancing the performance and efficiency of display devices and lighting systems.
Implementation Method 1
a lens disposed on the light emitting device to spread light emitted from the light emitting device
Data Source
AI summary
A lens including a light entering part having a concave shape in a lower region of the lens, and on which light emitted from a light emitting device is to be incident, and a light exiting part through which the incident light is emitted to an outside of the lens, in which each of the light entering part and the light exiting part has a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, the light entering part includes a light incident vertical surface extending from a lower surface of the lens, and a light incident inclined surface extending upward from the light incident vertical surface, and the light incident vertical surface surrounds the light emitting device.