Light Guide Plate Optical Layer Side Surface Reflectance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light guide plates suffer from light leakage and bright lines due to inefficient light utilization, leading to suboptimal optical quality in backlight modules and display devices.
Innovation Solution
A light guide plate with an optical layer on its side surface, featuring a specific reflectance characteristic with a percentage of parallel reflectance between 25% and 45% of the total reflectance, and a ratio of diffuse to parallel reflectance within certain ranges, designed to enhance light utilization and reduce light emission from the side surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light guide plate is used, then the structure is simple, but light leakage and bright lines occur due to inefficient light utilization
Solution Approach 1:
The light guide plate structure is segmented by adding a separate optical layer on the side surface, dividing the light management functions between the main body and the optical layer. This allows independent optimization of each component to improve light utilization while maintaining manageable complexity.
Solution Approach 2:
An optical layer is introduced as an intermediary component on the side surface of the light guide plate. This optical layer mediates the interaction between the light guide plate and the external environment, controlling light reflection and preventing light leakage through its specific optical properties.
2Illumination intensity
If the optical layer has high parallel reflectance, then light is reflected efficiently, but bright lines appear on the display
Solution Approach 1:
The optical layer's reflectance parameters are precisely controlled, with parallel reflectance set between 25-45% of total reflectance. This parameter optimization ensures sufficient light reflection for brightness while avoiding excessive parallel reflection that causes bright lines, achieving a balanced optical performance.
3Illumination intensity
If the optical layer has high diffuse reflectance, then light is scattered well, but light leakage increases from the side surface
Solution Approach 1:
The diffuse reflectance of the optical layer is optimized to be within 55-75% of total reflectance. This parameter control ensures adequate light scattering for uniform illumination while preventing excessive diffuse reflection that would cause light leakage from the side surface.
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 effectively minimizes light leakage and bright lines, improving the overall optical quality of the backlight module and display device, particularly suitable for narrow frame applications.
Implementation Method 1
A total reflectance of the reflectance characteristic is composed of a diffuse reflectance and a parallel reflectance
Implementation Method 2
A percentage value of the parallel reflectance to the total reflectance is defined as an R, and a value of the R is less than 45 and larger than 25
Data Source
AI summary
A light guide plate, a backlight module and a display device are provided. The light guide plate includes a main body and an optical layer. The main body has a light-incident surface, a side surface and an optical surface. The light-incident surface and the side surface are respectively connected to the optical surface. The optical layer is correspondingly disposed on the side surface of the main body. In a reflectance characteristic of the optical layer, a total reflectance of the reflectance characteristic is composed of the diffuse reflectance and the parallel reflectance. The percentage value of the parallel reflectance to the total reflectance is less than 45 and larger than 25, including the end point.