Optical Lens with Recessed Surface for Wide LED Illumination
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Solution Overview
Problem
Conventional direct-type backlight modules using LEDs struggle to achieve a wide illumination field due to limited light distribution, as the existing optical lenses do not effectively diverge light emitted by LEDs to cover a large peripheral area efficiently.
Innovation Solution
An optical lens design featuring a symmetrical structure with specific optical surfaces, including a recessed first optical surface, a conical light spreading surface, and a third optical surface for total internal reflection, coupled with fixing pins for secure mounting, which is made of light transmissive materials like polycarbonate or glass, to optimize light divergence and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical lenses are used with LED light sources, then the structure is simple and easy to manufacture, but the light distribution is limited and cannot achieve wide illumination field
Solution Approach 1:
The optical lens is divided into multiple functional surfaces: a first optical surface for light entry, a second optical surface with light spreading section for divergence, a third optical surface for total internal reflection, and a fourth optical surface for final light exit. Each surface segment performs a specific optical function to collectively achieve wide illumination field.
Solution Approach 2:
Different regions of the optical lens have different optical properties. The light spreading section has a specific refractive index distribution to diverge light, while the third optical surface is designed for total internal reflection. This local optimization of optical properties enables efficient light distribution across wide angles.
2Area of stationary object
If existing optical lenses are used, then manufacturing is straightforward, but light divergence efficiency is insufficient to cover large peripheral area
Solution Approach 1:
The optical lens employs curved surfaces including a conical light spreading section and spherical/cylindrical optical surfaces. These curved geometries are designed to refract and reflect light at specific angles to maximize coverage area while maintaining manufacturability through standard molding techniques.
Solution Approach 2:
The optical lens design incorporates specific parameter optimizations including refractive index selection, surface curvature radii, and thickness distribution. These parameters are carefully controlled during manufacturing to achieve the desired light divergence performance and wide illumination field.
3Adaptability or versatility
If conventional lenses are used to spread light, then the structure remains simple, but light distribution uniformity and width are insufficient
Solution Approach 1:
The optical lens features an asymmetric design where the light spreading section has a conical shape with specific angle, and the optical surfaces are positioned at different locations and orientations. This asymmetric configuration optimizes light path control to achieve uniform distribution across wide angular ranges.
Solution Approach 2:
The optical lens utilizes three-dimensional surface configurations including conical, spherical, and cylindrical elements arranged in multiple dimensions. This multi-dimensional approach enables effective light control in various directions simultaneously, achieving wide and uniform illumination field.
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 optical lens design enhances light distribution by refracting and reflecting light emitted from LEDs, resulting in a wider illumination field for the backlight module, effectively addressing the limited light coverage issue in conventional designs.
Implementation Method 1
The optical lens 10 is configured for diverging light emitted from the LED light source 210 towards a periphery thereof
Implementation Method 2
a third optical surface (140) arranged oppositely to the bottom surface (110)
Data Source
AI summary
An optical lens includes a first optical surface located at a bottom thereof, a third optical surface located at a top thereof and arranged oppositely to the first optical surface, and a second optical surface extending between the first optical surface and the third optical surface. The third optical surface is recessed downwardly towards the first optical surface. The light from the LED light source enters into the optical lens through the first optical surface, most of the entering light is directly refracted out of the optical lens through the second optical surface, and a part of the entering light that strikes the third optical surface is first reflected by the third optical surface towards the second optical surface via total internal reflection and then refracted out of the optical lens through the second optical surface. A backlight module incorporating the optical lens is also provided.