LED Lens with Protruding Aspheric Emitter for Uniform Illumination
Solution Overview
Problem
Existing display apparatuses with light emitting diode backlights face challenges in uniformly diffusing light across the display panel due to the point light source nature of LEDs, requiring effective lens designs to distribute light efficiently.
Innovation Solution
A lens design featuring an incidence portion, a first emitting portion with a gradually decreasing diameter, and a second emitting portion protruding forward, with aspheric surfaces to refract and diffuse light, guiding it towards the display panel for uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple lens structure is used, then manufacturing is easier, but light diffusion coverage is insufficient
Solution Approach 1:
The lens is divided into multiple functional portions: an incidence portion for receiving light, a first emitting portion with a gradually decreasing diameter for initial light diffusion, and a second emitting portion protruding forward for extended diffusion. This segmentation allows each portion to contribute to light distribution in a specific zone, achieving wide coverage while maintaining manufacturability through a systematic structural division.
Solution Approach 2:
The second emitting portion protrudes forward from the first emitting portion in the axial direction (depth dimension), creating a three-dimensional light diffusion structure. This dimensional extension allows light to be diffused not only radially but also axially, significantly increasing the coverage area without requiring a proportionally larger lens footprint.
2Manufacturing precision
If light diffusion distance is increased, then uniform illumination is improved, but lens structure becomes more complex
Solution Approach 1:
The lens exhibits local quality variations through its asymmetric structure: the first emitting portion has a gradually decreasing diameter from rear to front, while the second emitting portion protrudes forward with a different curvature. These localized geometric variations create different light diffusion characteristics in different zones, achieving uniform illumination without requiring complex overall structure.
Solution Approach 2:
Both emitting portions feature curved surfaces with specific radius of curvature values. The first emitting surface has a first radius of curvature and the second emitting surface has a second radius of curvature, creating smooth light diffusion through controlled curvature. This use of spheroidality achieves uniform illumination while maintaining relatively simple manufacturing processes compared to complex aspheric or free-form surfaces.
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 ensures wider diffusion of light, achieving uniform illumination across the display panel by extending the light distribution distance and improving optical properties, resulting in a more efficient light distribution.
Implementation Method 1
the first emitting portion includes a first emitting surface forming an outer circumferential surface of the first emitting portion to refract and emit the light transmitted through the first emitting portion
Data Source
AI summary
Provided herein is a display apparatus including a light emitting diode and a lens for diffusing light generated from the light emitting diode. The lens includes a first emitting portion forming a first emitting surface, and a second emitting portion protruding from the first emitting portion and forming a second emitting surface, so that the light may be diffused by a protruding distance of the second emitting portion.