Light-Emitting Module With Reflection Layers And Optical Disturbance Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional backlight modules (BLMs) are limited in size by the width of the LED, resulting in a large mechanism that cannot fit narrow applications, such as laptop bezels, and have poor light output uniformity and intensity due to reliance on optical fibers, which cannot be adjusted.
Innovation Solution
A light-emitting module comprising a light guide plate with a light incident surface, a light exit surface, and reflection layers that reflect light back into the plate, along with optical disturbance structures to control light transmission and increase brightness, allowing for a slender light exit surface and improved uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional BLM design is used with LED width constraint, then light-emitting area is limited, but the size of the entire mechanism becomes very large
Solution Approach 1:
The patent changes the light transmission direction from the traditional front surface to the side surface of the light guide plate. By making the light exit surface extend along the thickness direction of the light guide plate, the light-emitting area is increased without increasing the planar footprint of the BLM, thus resolving the contradiction between light-emitting area and overall size.
2Illumination intensity
If optical fiber design is adopted for narrow light transmission, then light output uniformity is poor, but light intensity cannot be adjusted
Solution Approach 1:
The patent introduces optical disturbance structures with variable density along the light transmission path. By changing the density parameter of these structures, the light extraction efficiency is controlled to achieve uniform light output. Additionally, the system allows adjustment of light intensity by modifying the excitation conditions of the light-emitting elements, providing adaptability while maintaining uniformity.
3Length of stationary object
If light exit surface is made narrow for compact design, then light transmission is limited, but light output effect is insufficient
Solution Approach 1:
The patent extends the light exit surface along the thickness direction of the light guide plate, creating a slender light-emitting structure. This dimensional change allows the light exit surface to be narrow in the planar view while providing sufficient light transmission area through the thickness direction, thus achieving both compact design and adequate light output effect.
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 solution enables a more compact and efficient light-emitting module with enhanced light uniformity and intensity, suitable for narrow applications, by redirecting and diffusing light within the light guide plate, providing a visual effect of a slender light exit surface.
Implementation Method 1
The first reflection layer is disposed corresponding to the first surface to cover the first surface and configured to reflect light exiting the light guide plate from the first surface back into the light guide plate
Implementation Method 2
The second reflection layer is disposed corresponding to the second surface to cover the second surface and configured to reflect light exiting the light guide plate from the second surface back into the light guide plate
Implementation Method 3
A plurality of optical disturbance structures. The optical disturbance structures are disposed on the first surface. A density of the optical disturbance structures gradually increases in a direction away from the light incident surface and in a direction toward the light exit surface
Data Source
AI summary
A light-emitting module includes a light guide plate, a light-emitting element, a first reflection layer and a second reflection layer. The light guide plate has a light incident surface, a light exit surface, a first surface, and a second surface. The light incident surface has three edges connected sequentially. The first surface, the light exit surface, and the second surface are connected to the edges respectively. The first surface and the second surface are respectively located on opposite sides of the light guide plate. The light exit surface extends away from the light incident surface and is elongated. The light-emitting element is configured to emit light toward the light incident surface. The first reflection layer is disposed corresponding to the first surface to cover the first surface. The second reflection layer is disposed corresponding to the second surface to cover the second surface.