Asymmetric Light Control Lens for Backlight Units
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Solution Overview
Problem
Conventional direct back light units (BLUs) using LEDs require larger lenses or increased optical distances to achieve wider light distribution, which increases size and weight, reducing productivity and competitiveness.
Innovation Solution
A multiple light control lens with an asymmetric light distribution design, featuring a disc-shaped diffusion part with a concave accommodation area and a plane of incidence that includes a plate-shaped surface with varying heights and curvatures, allowing for light reflection and diffusion to achieve wider light irradiation without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the lens is increased to irradiate light to a wider area, then the light coverage is improved, but the productivity is reduced and management costs increase
Solution Approach 1:
The patent applies asymmetry by designing the lens with different curvature radii in different regions (first curvature radius R1 in the first region, second curvature radius R2 in the second region). This asymmetric optical design enables the lens to distribute light asymmetrically, achieving wider light coverage area without requiring an overall increase in lens size, thereby maintaining productivity
Solution Approach 2:
The patent implements local quality by dividing the lens into different regions with distinct optical properties. The first region has a first curvature radius R1 while the second region has a second curvature radius R2, where R1 ≠ R2. This local variation in curvature allows different parts of the lens to perform specialized functions, achieving comprehensive light distribution without increasing the overall lens area
2Area of stationary object
If the optical distance is increased to irradiate light to a wider area, then the light coverage is improved, but the weight of the product increases
Solution Approach 1:
The asymmetric curvature design (different R1 and R2 values) enables the lens to achieve wider light coverage without increasing the optical distance. The asymmetric optical path allows light to be distributed more efficiently across the target area, maintaining a compact optical distance and thus reducing overall product weight
3Quantity of substance
If the number of LEDs per unit area is reduced to improve price competitiveness, then the cost is reduced, but the output of individual LED must be increased requiring larger lenses
Solution Approach 1:
The asymmetric lens design with different curvature radii (R1 and R2) optimizes light distribution to cover a wider area. This allows the system to use fewer LEDs per unit area while each LED's light is effectively distributed across a larger region, reducing the need for larger individual lenses
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 achieves asymmetric light distribution, reducing the thickness and weight of the back light unit while maintaining or improving light coverage, thereby enhancing productivity and competitiveness.
Implementation Method 1
designing a light diffusion process of a diffusion lens to further include a light reflection mechanism as well as a light incident and diffusion mechanism
Implementation Method 2
allow the light emitted from the LED to pass through the face of the lens, diffuse and be irradiated to a wider area
Data Source
AI summary
A lens can includes a disc-shaped diffusion part in which a top surface central part thereof is lower than a top surface edge part, and a concave accommodation part that is formed on a center of a bottom surface of the diffusion part and provides a space in which a light source is accommodated therein, wherein a plane of incidence to which a light of the light source is incident is formed on an interface between the concave accommodation part and the diffusion part, wherein the plane of incidence includes a plate-shaped surface in which a height of an edge part is lower than a central part thereof; and a vertical side surface extending from an edge of the plate-shaped surface to a bottom surface of the diffusion part.