Optical Member Lens Prism Backlight Luminance
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Solution Overview
Problem
Conventional backlight assemblies for liquid crystal display (LCD) devices face challenges in achieving high luminance uniformity and reducing thickness, as they often require a light-diffusing plate spaced far from the light source, leading to increased light loss and assembly thickness.
Innovation Solution
An optical member with a surface featuring a combination of lens-shaped and prism-shaped portions, optimized in ratio, pitch, and material composition, is integrated into the backlight assembly to improve luminance uniformity and reduce thickness by diffusing light effectively and minimizing the distance between the light source and the optical member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-diffusing plate is spaced far away from the flat-type fluorescent lamp to remove dark lines and improve luminance uniformity, then luminance uniformity is improved, but light loss increases and overall thickness increases
Solution Approach 1:
A reflective layer is introduced as an intermediary between the flat-type fluorescent lamp and the light-diffusing plate. This reflective layer redirects light that would otherwise be lost toward the display surface, thereby reducing light loss while maintaining the spacing needed for dark line removal and luminance uniformity.
Solution Approach 2:
The solution addresses the light loss issue not by reducing the spacing in the vertical dimension, but by utilizing the horizontal dimension through the reflective layer to redirect light paths. This allows the light-diffusing plate to remain at the optimal distance for uniformity while recovering light that would otherwise be wasted.
2Illumination intensity
If a light-diffusing plate is spaced far away from the flat-type fluorescent lamp to remove dark lines and improve luminance uniformity, then luminance uniformity is improved, but overall thickness increases
Solution Approach 1:
The reflective layer serves as a mediator that enables the light-diffusing plate to be positioned farther from the lamp for uniformity without proportionally increasing overall thickness. By recovering and redirecting light, the system achieves uniformity goals while minimizing the thickness penalty through efficient light utilization.
Solution Approach 2:
The reflective layer changes the optical parameters of the system by redirecting light paths, effectively decoupling the relationship between plate spacing and overall thickness. This allows optimization of luminance uniformity through increased spacing while the reflective layer compensates for the thickness increase by improving light utilization efficiency.
3Area of stationary object
If multiple CCFLs are employed in larger LCD devices to cover the display area, then light coverage is improved, but manufacturing cost increases and luminance uniformity deteriorates
Solution Approach 1:
The flat-type fluorescent lamp is segmented into multiple discharge spaces arranged in a grid pattern, with each space contributing to uniform light emission across the display area. This segmentation eliminates the need for multiple separate CCFLs while maintaining broad coverage and improving uniformity through the integrated structure.
Solution Approach 2:
Multiple discharge spaces within the flat-type fluorescent lamp are merged into a single integrated light source structure. This combining approach provides broad area coverage like multiple CCFLs would, while achieving superior luminance uniformity through the coordinated emission from all discharge spaces and the subsequent light diffusion.
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 optical member enhances luminance uniformity and reduces the overall thickness of the backlight assembly by effectively diffusing light and minimizing light loss, while maintaining a compact design.
Implementation Method 1
an optical member spaced apart from the flat-type fluorescent lamp by a predetermined distance... both the lens-shaped portions and the prism-shaped portion may be formed on a surface of the optical member to remove a dark line that is formed between adjacent discharge spaces
Implementation Method 2
optical member capable of increasing luminance and decreasing a thickness... effectively diffusing light
Data Source
AI summary
A backlight assembly includes a light source and an optical member disposed over the light source and including a surface that has a plurality of lens-shaped portions and at least one prism-shaped portion.