Backlight Module Mixing Light Guide Plate RGB Color Uniformity
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Solution Overview
Problem
Conventional LED backlight modules suffer from inefficient light mixing, leading to non-uniform color mixing and brightness, and require longer mixing light guide plates, which can reduce luminous efficiency and increase manufacturing complexity.
Innovation Solution
A backlight module incorporating a mixing light guide plate with a diaphanous sheet, transparent sheet, and uneven surface sheet, having different refractive indexes, to refract and mix RGB tri-color lights effectively, enhancing light mixing and brightness while being easily integrated into existing manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional mixing light guide plate is used to mix RGB tri-color lights, then light mixing is achieved, but the light mixing efficiency is low and the required plate length is long
Solution Approach 1:
The patent applies parameter changes by modifying the refractive index distribution within the mixing light guide plate. By creating an uneven surface sheet with varying refractive indexes (n1, n2, n3) that increase from bottom to top, the light path is controlled more effectively, improving mixing efficiency while reducing the required plate length.
Solution Approach 2:
The mixing light guide plate is constructed as a composite structure with multiple sheets (diaphanous sheet, transparent sheet, uneven surface sheet) having different refractive indexes. This composite material approach enables superior light mixing performance compared to conventional homogeneous light guide plates.
2Stability of the object's composition
If the length of mixing light guide plate is increased to improve light mixing, then color uniformity is improved, but luminous efficiency is reduced
Solution Approach 1:
By changing the refractive index parameter distribution within the light guide plate, the patent achieves effective light mixing over a shorter distance. The uneven surface sheet creates controlled refraction that maintains color uniformity without requiring increased plate length that would cause energy loss.
3Illumination intensity
If conventional light mixing methods are used, then light mixing is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated mixing light guide plate structure. By combining the light guiding function with the light mixing function in one component (rather than separate components), the manufacturing process is simplified while maintaining effective light mixing.
Solution Approach 2:
The mixing light guide plate is segmented into multiple functional sheets (diaphanous sheet, transparent sheet, uneven surface sheet) that can be manufactured separately and then assembled. This segmentation allows for specialized manufacturing of each layer while simplifying the overall production process.
4Stability of the object's composition
If RGB tri-color LED is used as backlight light source, then color saturation is enhanced, but additional optical components and space are required
Solution Approach 1:
The mixing light guide plate serves multiple functions: it guides light from the RGB LED, mixes the three colors to achieve uniform white light output, and provides structural support. This multi-functionality eliminates the need for separate mixing components, reducing overall device complexity and space requirements.
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 provides improved light mixing and luminous efficiency, achieving uniform brightness and color mixing with reduced manufacturing complexity and cost, enhancing industrial competitiveness.
Implementation Method 1
A backlight module incorporating a mixing light guide plate with a diaphanous sheet, transparent sheet, and uneven surface sheet, having different refractive indexes, to refract and mix RGB tri-color lights effectively
Data Source
AI summary
A backlight module includes a light guide, a mixing light guide plate, and a plurality of light sources. The first light guide comprises a first side surface. The mixing light guide plate comprises an incident surface with anomalous surface and an emergent surface with fog surface. The mixing light guide plate is set on the first side surface. A plurality of light sources disposed corresponding to the incident surface, with light emitted there from and entering the mixing light guide plate through the incident surface then exits the mixing light guide plate through the emergent surface, finally, entering the light guide through the first side surface.