Backlight Module Light Conversion Layer Uniformity
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Solution Overview
Problem
Conventional direct lit LED LCD screens face issues with non-white light on the sides due to the failure of the light conversion layer, which cannot be fundamentally addressed by making the failure area as narrow as possible.
Innovation Solution
A backlight module design that includes a backplane with a receiving space, a backlight light source, a first light conversion layer, and a first light leveling layer, where the second light conversion layer is positioned on a target area of the first light leveling layer to cover the projection area of the first light conversion layer, enhancing the light conversion function and avoiding light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the failure area of the light conversion layer is made as narrow as possible, then the light conversion efficiency is improved, but the non-white light issue on four sides cannot be fundamentally addressed
Solution Approach 1:
The patent applies local quality by creating different light conversion zones within the light conversion layer. The first light conversion layer has a first light conversion region with lower light conversion function and a second light conversion region with higher light conversion function. This spatial differentiation of light conversion properties allows different areas to address different aspects of the lighting uniformity problem, fundamentally solving the non-white light issue on sides while maintaining overall conversion efficiency.
Solution Approach 2:
The patent segments the light conversion layer into multiple functional regions - the first light conversion layer with its two distinct regions, the second light conversion layer, and the third light conversion layer. Each segment serves a specific purpose in managing light conversion at different locations and intensities, allowing the system to address both efficiency and uniformity requirements simultaneously.
2Reliability
If a multi-layer light conversion structure is implemented, then the light conversion function is enhanced and lighting uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by transitioning from a single-layer to a multi-layer structure, adding the vertical dimension to light conversion management. The first, second, and third light conversion layers are arranged at different positions relative to the backlight light source, creating a three-dimensional light conversion system that enhances functionality while distributing the complexity across multiple specialized components rather than one complex component.
Solution Approach 2:
The complex light conversion function is segmented across multiple layers, with each layer having specific light conversion characteristics and positioned to address particular lighting uniformity requirements. This segmentation allows each layer to be optimized independently for its specific function, managing overall system complexity through functional decomposition.
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 effectively converts unconverted light into white light, ensuring uniform lighting and brightness, improving the display effect by addressing the non-white light issue and reducing light leakage.
Implementation Method 1
A second light conversion layer is laid on a first target area of the first light leveling layer, and a projection area of the second light conversion layer on the first inner surface covers a projection area of a first area of the first light conversion layer on the first inner surface. A light conversion function of a second area of the first light conversion layer is stronger than the light conversion function of the first area
Data Source
AI summary
A backlight module. The backlight module includes a backplane, a backlight light source, a first light conversion layer, and a first light leveling layer. The backplane includes a receiving space, and the backlight light source is fixed on a first inner surface of the receiving space. The first light conversion layer is positioned on the light emitting side of the backlight light source, and there is a first distance between the first light conversion layer and a second inner surface of the receiving space. The first inner surface and the second inner surface intersect to form a right angle. The first light leveling layer is positioned on the side of the first light conversion layer away from an outer surface of the backlight light source. A second light conversion layer is laid on a first target area of the first light leveling layer, and a projection area of the second light conversion layer on the first inner surface covers a projection area of a first area of the first light conversion layer on the first inner surface. A light conversion function of a second area of the first light conversion layer is stronger than the light conversion function of the first area, and the second area includes an area of the first light conversion layer that is different from the first area.