Light Diffusing Lens With Concave Incident Portion For Slim Backlight
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Solution Overview
Problem
Conventional light diffusing lenses in backlight units for display devices have limited beam angle distribution, requiring a large number of light emitting elements and a significant distance between the light emitting device and diffusive plate, which hinders the achievement of a slim structure and uniform illumination.
Innovation Solution
A light diffusing lens with a concave light incident portion, a reflective portion, and a light exit portion, where the light incident portion has a convex shape bulging in the direction of the optical axis, and the reflective portion reflects light towards the exit portion, providing a beam angle distribution focused laterally, allowing for a reduced distance between light emitting devices and the diffusive plate, thus enabling a slim backlight unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional light diffusing lenses with limited beam angle distribution are used, then the structure can be simpler, but a large number of light emitting elements are required and a significant distance must be maintained between the light emitting device and diffusive plate
Solution Approach 1:
The patent applies parameter changes by modifying the beam angle distribution characteristics of the light diffusing lens. The lens is designed with specific optical parameters that enable a beam angle distribution focused in the lateral direction, achieving a wider effective illumination angle without increasing structural complexity or the number of light emitting elements required.
2Device complexity
If conventional light diffusing lenses with limited beam angle distribution are used, then the structure can be simpler, but a significant distance must be maintained between the light emitting device and diffusive plate
Solution Approach 1:
The patent modifies the optical parameters of the light diffusing lens to achieve a beam angle distribution focused in the lateral direction. This parameter change enables the lens to effectively illuminate the diffusive plate at shorter distances, reducing the required spacing while maintaining structural simplicity.
3Illumination intensity
If a larger number of light emitting elements are used to achieve uniform illumination, then illumination uniformity is improved, but power consumption increases
Solution Approach 1:
The patent changes the beam angle distribution parameter of the light diffusing lens to focus light laterally. This enables fewer light emitting elements to achieve uniform illumination across the diffusive plate, thereby reducing the total power consumption while maintaining illumination uniformity.
4Quantity of substance
If the beam angle distribution is focused laterally, then the number of light emitting elements is reduced, but the lens structure becomes more complex
Solution Approach 1:
The patent employs curved surface design in the light diffusing lens to achieve lateral beam angle distribution. The specific curvature profiles of the lens surfaces are optimized to redirect light laterally, reducing the number of required light emitting elements while keeping the lens structure relatively simple through geometric optimization rather than complex mechanical arrangements.
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 described light diffusing lens achieves a wider beam angle distribution, reducing the number of light emitting elements needed and allowing for a more compact, uniformly illuminated slim structure in backlight units.
Implementation Method 1
a reflective portion having a concave shape depressed inwards from an upper portion of the light diffusing lens
Implementation Method 2
a light diffusing lens having a beam angle distribution focused in a lateral direction thereof
Data Source
AI summary
Disclosed is a light diffusing lens having a pointing angle distribution focused toward a lateral direction. The disclosed light diffusing lens includes a light entrance part having a concave shape formed inward from a lower part of the optical diffusing lens, a reflection part having a shape which is concave inward from an upper portion of the light diffusing lens and a light exit portion defined by an outer surface of the light diffusing lens, wherein the light entrance part has a first convex surface which is convex in an optical axial direction defined by a straight line passing through the center of the light diffusing lens as the straight line goes toward the inside of the light diffusing lens.