Light Diffusing Lens With Concave Reflective 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 in a lateral direction, allowing for a reduced distance between light emitting devices and the diffusive plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional light diffusing lens with limited beam angle distribution is used, then the structure is simple, 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, hindering slim structure achievement
Solution Approach 1:
The lens is divided into distinct functional regions: a light incident portion with a convex shape for receiving light, a reflective portion for reflecting light, and a light exit portion for emitting light. This segmentation allows each region to optimize its function, enabling broader beam angle distribution without increasing overall device complexity
Solution Approach 2:
The lens transitions from a conventional two-dimensional surface to a three-dimensional structure with the convex light incident portion protruding toward the light emitting element. This dimensional change enables enhanced light interaction and broader beam distribution while maintaining a compact form factor suitable for slim backlight units
2Device complexity
If a conventional light diffusing lens is used, then the lens design is simple, but uniform illumination cannot be achieved without densely arranging light emitting elements, increasing power consumption
Solution Approach 1:
Different regions of the lens are assigned different optical functions: the convex light incident portion for light reception and diffusion, the reflective portion for light redirection, and the light exit portion for controlled light emission. This local differentiation enables uniform illumination with fewer light emitting elements, reducing power consumption without complex overall design
Solution Approach 2:
The reflective portion acts as an intermediary between the light incident portion and the light exit portion, redirecting light to achieve uniform distribution across the diffusive plate. This intermediary mechanism enables efficient light utilization with reduced power consumption
3Volume of moving object
If a conventional light diffusing lens is used, then the structure is compact, but a significant distance must be maintained between the light emitting device and diffusive plate, preventing slim structure achievement
Solution Approach 1:
The light incident portion is designed with a convex curved surface that protrudes toward the light emitting element. This curvature enables broader beam angle distribution and more efficient light diffusion, allowing the diffusive plate to be positioned closer while maintaining uniform illumination, thus achieving a slim backlight unit structure
4Use of energy by moving object
If the number of light emitting elements is reduced, then power consumption decreases, but non-uniform brightness occurs due to quality deviation between elements
Solution Approach 1:
The lens design changes the optical parameters through its three-dimensional convex structure and reflective portion, transforming the light distribution pattern to achieve uniform illumination. This parameter transformation compensates for quality deviations in individual light emitting elements, enabling reduced element count while maintaining brightness uniformity
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 configuration enables a slim backlight unit with improved light distribution and reduced power consumption by promoting light mixing and diffusion, achieving uniform illumination without the need for a large number of light emitting elements.
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 is provided to each of the light emitting elements to promote light diffusion
Data Source
AI summary
A light diffusing lens having a pointing angle distribution focused toward a lateral direction. The 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. 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.