Asymmetric Diffusion Lens for LED Backlight Miniaturization
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Solution Overview
Problem
Existing asymmetric diffusion lenses for LED backlight units face challenges in miniaturization and uniform light distribution, particularly when LED arrangements have compact lateral intervals and wider vertical intervals, leading to increased unit prices and difficulty in achieving desired light distribution patterns.
Innovation Solution
An asymmetric diffusion lens with an elliptical upper surface and circular lower surface, featuring a concave accommodation part and varying side surface inclination angles (first and second inclination angles) between 1.1 and 1.8, allowing for customized light distribution and miniaturization while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If asymmetric diffusion lenses are used to achieve uniform light distribution, then light distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by designing the diffusion lens with an elliptical upper surface and a circular lower surface, creating different curvature radii in different directions. The side surfaces have different inclination angles (first inclination angle for major axis direction, second inclination angle for minor axis direction), which enables the lens to uniformly diffuse light from LEDs with asymmetric light distribution characteristics without requiring complex multi-element lens systems
Solution Approach 2:
The patent implements local quality by varying the inclination angles of different side surfaces according to their specific functions. The first inclination angle (for major axis direction) and second inclination angle (for minor axis direction) are optimized differently to match the LED arrangement pattern, where each local region of the lens has tailored optical properties to achieve overall uniform light distribution
2Ease of manufacture
If the number of LEDs per unit area is reduced to improve price competitiveness, then manufacturing cost is reduced, but light distribution uniformity deteriorates
Solution Approach 1:
The asymmetric lens design with different inclination angles compensates for the reduced number of LEDs by redirecting light more effectively in directions where LEDs are sparser, achieving uniform illumination coverage even with fewer light sources per unit area
Solution Approach 2:
The patent optimizes specific geometric parameters including the ratio of the first inclination angle to the second inclination angle, and the ratio of the major axis to minor axis of the elliptical upper surface, to enhance light diffusion efficiency and achieve uniform distribution with reduced LED density
3Illumination intensity
If side surface inclination angles are optimized for light distribution, then light distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
While the asymmetric design requires different inclination angles, the patent specifies practical angle ranges (first inclination angle: 30°-60°, second inclination angle: 15°-45°) that balance optical performance with manufacturability, avoiding excessively precise angular requirements
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 uniform light distribution and facilitates miniaturization, reducing manufacturing costs and enabling efficient light emission with adjustable side surface angles, ensuring optimal light distribution and image quality.
Implementation Method 1
an asymmetric diffusion lens for a light emitting diode (LED) backlight unit, and more specifically, to an asymmetric diffusion lens for an LED backlight unit which may be miniaturized
Implementation Method 2
Light emitted from the LEDs has a characteristic in which light dispersion is concentrated in a center portion in comparison with the surroundings. Accordingly, the light is not evenly distributed to the surroundings
Data Source
AI summary
The present disclosure relates to an asymmetric diffusion lens for a backlight unit, which includes a diffusion part of which an upper surface has an elliptical shape having a major axis and a minor axis, and a lower surface has a circular shape, a concave accommodation part provided at a center of the lower surface of the diffusion part to provide a space in which an LED package is accommodated, an incidence surface which is a boundary surface between the concave accommodation part and the diffusion part, and an exit surface as side surfaces and the upper surface of the diffusion part.