Backlight Unit Light Correction via Reflective Layer Openings
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Solution Overview
Problem
Existing backlight units for liquid crystal display devices face challenges in achieving uniform luminance and efficient manufacturing processes, particularly in adjusting the density of light correction materials to reduce color differences and improve color reproducibility across the display area.
Innovation Solution
A backlight unit design that adjusts the density of a light correction material layer using the arrangement density of opening patterns in a reflective layer, where the opening patterns decrease in density and area from the peripheral area to the central area, allowing the light correction material layer to absorb or convert light in specific wavelength ranges, thereby reducing color differences and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light correction material layer is added to reduce color differences and improve color reproducibility, then color uniformity is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent combines the light correction material layer with the reflective layer into a single integrated structure. The reflective layer contains both reflective particles and light correction particles (such as yellow phosphors) within the same layer, eliminating the need for separate layers and reducing manufacturing complexity while maintaining color uniformity improvement
Solution Approach 2:
The reflective layer is designed to perform multiple functions simultaneously: it reflects light to maintain brightness and contains light correction particles to reduce color differences. This multi-functional design eliminates the need for additional dedicated light correction layers, reducing device complexity while achieving color uniformity
2Manufacturing precision
If the light correction material layer density is increased to reduce blue light in peripheral areas, then color reproducibility is improved, but manufacturing complexity increases due to need for variable density control
Solution Approach 1:
The patent applies light correction particles selectively in the peripheral areas of the backlight unit where color differences are most prominent. The density of light correction particles varies by location, with higher concentration in peripheral regions and lower or zero concentration in central areas, achieving color reproducibility improvement without requiring complex variable density control across the entire unit
Solution Approach 2:
The patent controls the concentration and distribution parameters of light correction particles to optimize color reproducibility. By adjusting particle density, size, and spatial distribution in different regions, the system achieves improved color uniformity while maintaining manufacturability through standard mixing and coating processes
3Manufacturing precision
If opening patterns are added to the reflective layer to expose light correction material, then color uniformity is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the opening pattern formation with the reflective layer structure itself. The reflective layer is designed with inherent openings or transparent regions that expose the light correction material layer below, eliminating the need for separate patterned overlays or additional masking layers, thus improving luminance uniformity without significantly increasing device complexity
Solution Approach 2:
The reflective layer acts as an intermediary structure that both reflects light and provides controlled exposure to the light correction material layer. By integrating opening patterns into the reflective layer design, the system mediates between light reflection requirements and light correction requirements in a single unified structure
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
This design enhances color reproducibility and uniformity by reducing the amount of blue light in the peripheral area, improving the overall display quality while simplifying the manufacturing process by omitting the need to redesign the arrangement density of the light correction material layer according to the reflective layer material.
Implementation Method 1
the light correction material layer may include a material which absorbs light of the first wavelength range
Implementation Method 2
the light correction material layer may include a material which converts light of the first wavelength range into light in a second wavelength range different from the first wavelength range
Implementation Method 3
a reflective layer disposed on the surface of the bottom chassis
Data Source
AI summary
A backlight unit includes a central area and a peripheral area disposed outside the central area, the backlight unit includes a bottom chassis, a plurality of light sources disposed on a surface of the bottom chassis, a reflective layer disposed on the surface of the bottom chassis, where a plurality of light source insertion holes and a plurality of opening patterns are defined through the reflective layer, and a light correction material layer disposed between the bottom chassis and the reflective layer in the peripheral area, where the light source insertion holes expose the light sources, respectively, and the opening patterns are disposed in the peripheral area to expose at least a portion of the light correction material layer in a thickness direction.