Backlight Lens With Segmented Refraction And Reflection
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Solution Overview
Problem
Conventional backlight units for display devices face inefficiencies in light distribution and coupling between refraction and reflection components, leading to reduced luminous efficiency and potential defects in light emission.
Innovation Solution
A backlight unit design featuring a substrate with integrated light assemblies, including a light source shielded by a lens with a refraction portion and a reflection portion coupled via an adhesive layer or double injection process, where the reflection portion is inclined and features a central hole, pads, and an electrostatic portion to enhance light distribution and prevent static discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional lens structure is used to shield the light source, then the light source is protected, but light distribution efficiency is reduced
Solution Approach 1:
The lens is divided into multiple functional portions: a refraction portion for bending light, a reflection portion for redirecting light, and a shield portion for protecting the light source. Each portion is optimized for its specific function, allowing the lens to protect the light source while maintaining high light distribution efficiency through coordinated action of the segmented components.
Solution Approach 2:
Different portions of the lens have different optical properties tailored to their specific functions. The refraction portion has specific curvature for light bending, the reflection portion has reflective coating for light redirection, and the shield portion has opaque or absorptive properties for protection. This local optimization allows each region to contribute maximally to overall light distribution efficiency while providing comprehensive protection.
2Ease of manufacture
If refraction and reflection portions are separately manufactured, then manufacturing flexibility is improved, but coupling precision and light emission uniformity deteriorate
Solution Approach 1:
The refraction portion, reflection portion, and shield portion are integrated into a single monolithic lens structure manufactured in one process. This merging eliminates the need for separate coupling steps, ensuring precise alignment and uniform light emission across the entire lens aperture while maintaining manufacturing flexibility through modular design of the integrated structure.
Solution Approach 2:
The integrated lens structure performs multiple functions simultaneously: refraction, reflection, shielding, and light distribution. By combining these functions into a single universal component, the design achieves both manufacturing flexibility (through standardized production processes) and high coupling precision (through inherent alignment of all functional portions).
3Loss of energy
If the reflection portion has large diameter to improve light collection, then light collection efficiency is improved, but static discharge risk increases
Solution Approach 1:
An electrostatic discharge prevention structure is introduced as an intermediary element within the reflection portion. This structure, positioned at the periphery of the large-diameter reflection surface, provides a controlled path for static charge dissipation while maintaining the full light-collecting area of the reflection portion. The intermediary structure enables both high light collection efficiency and static discharge protection to coexist.
Solution Approach 2:
The electrostatic discharge prevention structure is localized to specific regions (peripheral areas) of the reflection portion where static charge accumulation is most likely to occur. This local treatment allows the central and majority regions of the reflection portion to maintain their full light-collecting function with large diameter, while only the necessary peripheral zones are modified for electrostatic management.
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 design improves light efficiency by uniformly distributing light and preventing static discharge, resulting in enhanced luminous performance and reduced production costs through improved coupling and reduced heat loss.
Implementation Method 1
a refraction portion separately located on the upper surface of the light source
Implementation Method 2
a reflection portion separately located at the side surface of the light source
Data Source
AI summary
A display device is provided. The display device includes: a substrate; and at least one light assembly separately located on the substrate, wherein the light assembly includes: a light source; and a lens configured to shield an upper surface and a side surface of the light source, wherein the lens includes: a refraction portion separately located on the upper surface of the light source; and a reflection portion separately located at the side surface of the light source. Thereby, the lens includes a reflection portion located at a side surface of the light source, thereby improving light efficiency of a backlight unit.