LED Lens Design for Uniform Backlight Illumination
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Solution Overview
Problem
Current LED lenses emit light with a small area and non-uniform intensity, requiring multiple LEDs to achieve uniform light distribution, leading to high costs and complex backlight modules.
Innovation Solution
A lens design with a bottom surface, inner concave light incident surface, successively connected convex and ringy inclined light exiting surfaces, and a structure that refracts and reflects light to increase the light exiting area and uniformity, using a combination of convex and concave surfaces to disperse light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single LED with a conventional lens is used, then the structure is simple and cost is low, but the light emitting area is small and light uniformity is insufficient
Solution Approach 1:
The lens is divided into multiple functional regions: a light incident surface with multiple light incident regions, a light exiting surface with multiple light exiting regions, and intermediate refractive regions. This segmentation allows different parts of the lens to control light paths independently, expanding the overall light emitting area while maintaining a single-LED structure.
Solution Approach 2:
The patent introduces multi-dimensional light path control through three-dimensional refractive surfaces and multiple light incident/exiting regions arranged in different spatial positions. This dimensional approach allows light to exit through multiple areas simultaneously, greatly expanding the light emitting area without adding multiple LEDs.
2Device complexity
If a single LED with a conventional lens is used, then the structure is simple and cost is low, but light uniformity across the plane is insufficient
Solution Approach 1:
Different regions of the lens are designed with specific optical properties: the light incident surface has multiple light incident regions with different orientations, the intermediate regions have specific refractive rates, and the light exiting surface has multiple light exiting regions. Each local region is optimized to contribute to overall light uniformity, allowing a single LED to achieve uniform illumination comparable to multiple LEDs.
3Illumination intensity
If multiple LEDs are arranged to achieve uniform light intensity, then light uniformity is improved, but cost increases and the backlight module system becomes heavy
Solution Approach 1:
The patent merges the functions of multiple LEDs into a single LED by designing a complex lens structure that performs the light distribution work of multiple LEDs. The lens integrates multiple light incident regions, intermediate refractive regions, and light exiting regions to achieve uniform light intensity distribution, eliminating the need for multiple LEDs and simplifying the backlight module system.
Solution Approach 2:
The lens structure performs multiple optical functions simultaneously: it receives light from a single LED, separates it into multiple light paths through the light incident surface, refracts light through intermediate regions, and directs it to multiple light exiting regions. This multi-functionality allows a single lens to replace what would traditionally require multiple LEDs and their respective lenses.
4Illumination intensity
If multiple LEDs are arranged to achieve uniform light intensity, then light uniformity is improved, but cost increases
Solution Approach 1:
The patent merges the functions of multiple LEDs into a single LED by designing a complex lens structure that performs the light distribution work of multiple LEDs. The lens integrates multiple light incident regions, intermediate refractive regions, and light exiting regions to achieve uniform light intensity distribution, eliminating the need for multiple LEDs and their associated costs.
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 uniformity and area coverage, reducing the need for multiple LEDs and simplifying backlight modules while maintaining cost-effectiveness.
Implementation Method 1
a light incident surface configured to receive light emitted by the light source
Implementation Method 2
a part of the light is reflected from one light exiting surface to another light exiting surface or bottom surface
Implementation Method 3
each light is refracted from different light exiting surface of the lens thereby increasing the light exiting area and the uniformity
Data Source
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AI summary
This invention is suitable for optical technology field. A lens, LED back light module and display device are provided. The lens receives light emitted by the light source through a light incident surface, the light emitted by the light source enters in the lens, a part of the light is refracted from one light exiting surface, a part of the light is reflected from one light exiting surface to another light exiting surface or bottom surface, then is reflected from the another light exiting surface or bottom surface to further another light exiting surface and finally is refracted from the further another light exiting surface, therefore the light emitted by the light source is separated in the lens, and then each light is refracted from different light exiting surface of the lens thereby increasing the light exiting area and the uniformity. The lens of the present invention is suitable for the LED back light modules and display devices.