Orthogonal-Axis Lens Structure for Uniform LED Backlighting
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Solution Overview
Problem
Optical interference between light emitting diodes (LEDs) in display devices and lighting systems leads to shadows and hot spots, which degrade the uniformity and quality of light emission.
Innovation Solution
A light emitting module comprising a lens with a specific design that includes a light entering part and a light exiting part with orthogonal major and minor axes, a protruding part with a curvature, and legs for support, which minimizes optical interference by directing light emission more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting diodes are used in display devices or general lighting, then the light output and coverage are improved, but optical interference between the light emitting diodes occurs causing shadows or partial hot spots
Solution Approach 1:
A lens is introduced as an intermediary component between multiple light emitting diodes and the illuminated surface. The lens refracts and redirects light rays from different LEDs, causing them to converge or diverge in a controlled manner that eliminates shadows and hot spots while maintaining high light output.
Solution Approach 2:
The optical parameters of light propagation are changed by using a lens with specific focal length and refractive index. This transforms the divergent light paths from multiple LEDs into controlled beams that can be precisely directed to achieve uniform illumination without optical interference.
2Area of stationary object
If multiple light emitting diodes are used to increase light coverage, then the illuminated area is improved, but uniformity of light distribution deteriorates due to optical interference
Solution Approach 1:
The lens acts as a mediating optical element that receives light from multiple LEDs and redistributes it uniformly across the target area. By positioning the lens at a specific distance from the LEDs and selecting appropriate optical parameters, the system achieves both large illuminated area and high uniformity.
Solution Approach 2:
Multiple light sources that would normally create interference patterns are merged into a single unified illumination pattern through the lens. The lens combines the light paths from different LEDs into overlapping but complementary beams that collectively produce uniform illumination across the entire illuminated area.
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 lens design enhances light distribution, reducing shadows and hot spots, resulting in improved uniformity and brightness of light emission.
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.