Asymmetric Optical Lens for Backlight Light Distribution
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Solution Overview
Problem
Conventional optical lenses with Z-axis symmetry in light-emitting devices lead to uneven light distribution, causing excessive light in one direction and insufficient light in others, particularly in backlight modules with aligned light-emitting units.
Innovation Solution
An optical lens with an asymmetric light-incident surface relative to the optical axis, featuring a long axis and short axis with different lengths, allowing for more light reception in specific directions to balance light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional Z-axis symmetrical optical lens is used, then the lens structure is simple and easy to manufacture, but the light distribution is uneven causing excessive light in one direction and insufficient light in other directions
Solution Approach 1:
The patent applies asymmetry by designing the optical lens with a non-circular light incident surface that has different curvature radii in different directions. Specifically, the lens has a first curvature radius in the first direction and a second curvature radius in the second direction, where these radii are different. This asymmetric design enables the lens to distribute light more uniformly in different directions, resolving the contradiction between simple structure and uniform light distribution.
2Productivity
If light-emitting units are arranged along a specific direction to reduce costs and improve assembly efficiency, then assembly efficiency improves, but uneven light distribution occurs with over light in specific direction and insufficient light in other directions
Solution Approach 1:
The patent applies local quality by creating different optical properties in different regions of the lens. The light incident surface has different curvature radii (first curvature radius in first direction, second curvature radius in second direction) to locally adjust light refraction characteristics. This allows the lens to compensate for the directional arrangement of light-emitting units, ensuring uniform light distribution across different directions while maintaining the simplified linear arrangement of light-emitting units for high assembly efficiency.
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
This design improves light distribution by increasing light output in the short-axis direction while reducing excessive light in other directions, enhancing the overall light flux ratio and reducing light leakage.
Implementation Method 1
an optical lens for adjusting light emitted by a light-emitting unit, including a light-incident surface and a light-emitting surface... The light-emitting surface receives and emits the light entering the optical lens from the light-incident surface
Data Source
AI summary
An optical lens, a light-emitting device and a backlight module are provided. The optical lens is used for adjusting light emitted from a light-emitting unit. The optical lens includes a light-incident surface and a light-emitting surface. The light-incident surface encloses a space for accommodating the light-emitting unit. The light-emitting surface is used for receiving and emitting light entering the optical lens via the light-incident surface. The optical lens has an optical axis, with respect to which the light-incident surface is asymmetric.