Lighting Device With Protruded Transmissive Member
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Solution Overview
Problem
Edge-lit backlight units with light sources in contact with the end face of the lightguide panel experience suboptimal light input efficiency and increased light leakage at the light-receiving edge.
Innovation Solution
Incorporating a first light-transmissive member with protrusions between the light-emitting element and the lightguide panel, allowing for partial gaps and refractive index differences that reduce light leakage by concentrating and reflecting light beams, thereby enhancing optical coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the light-emitting area of the light source is positioned to be in contact with the end face of the lightguide panel, then the light input efficiency into the lightguide panel is improved, but light having entered the inside of the lightguide panel has a smaller refraction and is more likely to leak at the light-receiving edge
Solution Approach 1:
A light-transmissive member with protrusions is introduced as an intermediary between the light source and the lightguide panel. This intermediary structure enables the light source to be positioned in contact with the panel while maintaining sufficient refraction through the protrusion geometry, thus resolving the contradiction between light input efficiency and light leakage prevention
Solution Approach 2:
The light-transmissive member features protrusions with specific local geometric properties (shape, size, distribution) that create localized refraction zones. These local quality variations allow different regions of the contact interface to serve different optical functions, preventing light leakage while maintaining overall coupling 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
The configuration effectively minimizes light leakage at the light-receiving edge even when the light-emitting area is in contact with the end face of the lightguide panel, maintaining efficient light refraction and input into the panel.
Implementation Method 1
light having entered the inside of the lightguide panel may have a smaller refraction, and the light may be more likely to leak at the light-receiving edge of the lightguide panel
Data Source
AI summary
A lighting device is provided. The lighting device includes a lightguide panel having an end face and a light-emitting device configured to emit light toward the end face of the lightguide panel. The light-emitting device includes a light-emitting element and a first light-transmissive member provided between the end face of the lightguide panel and the light-emitting element. The first light-transmissive member has a plurality of protrusions on a surface thereof. At least one of the plurality of protrusions is in contact with the end face of the lightguide panel.