Backlight Module Reflector Light-Mixing Cavity
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Solution Overview
Problem
Conventional backlight modules for liquid crystal displays using LEDs to mix red, blue, and green lights into white light require a long light-mixing distance, resulting in increased module thickness, which deviates from the trend of lighter and thinner displays.
Innovation Solution
The backlight module incorporates reflectors with point light sources disposed on their inner walls, allowing for the mixing of red, blue, and green lights to produce white light, reducing the need for additional light guide plates and thereby maintaining a thinner design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a first light guide plate is added to increase the light-mixing distance, then the uniformity of white light is improved, but the overall thickness of the backlight module increases
Solution Approach 1:
The patent combines the light-mixing function and the reflective function into a single integrated component (the reflector with light-mixing cavity). Instead of using separate light guide plates and reflectors, the reflector itself creates a cavity that allows red, green, and blue lights to mix uniformly while maintaining a compact structure. This merging eliminates the need for additional thickness-inducing components.
Solution Approach 2:
The patent transitions from a planar light-mixing approach (using light guide plates that increase thickness) to a three-dimensional light-mixing cavity formed by the reflector. The cavity volume allows light paths to intersect and mix in multiple dimensions, achieving uniform white light without requiring increased module thickness.
2Illumination intensity
If multiple light guide plates are used to achieve uniform light mixing, then the color saturation is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple light guide plates and reflectors into a single integrated reflector structure with an internal light-mixing cavity. This single component performs what previously required multiple separate components, thereby reducing device complexity while maintaining color saturation through the cavity's light-mixing capability.
Solution Approach 2:
The reflector is designed to serve multiple functions simultaneously: it provides structural support, creates the light-mixing cavity, reflects light, and defines the optical path for red, green, and blue LEDs. This multi-functionality reduces the number of components needed while achieving the desired optical performance.
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 configuration achieves high saturation white light while maintaining a thinner module profile, aligning with the design trend of lighter and thinner displays, and enhances heat dissipation in direct type modules, prolonging service life.
Implementation Method 1
The reflectors are disposed beside the light incident surface. The point light sources are disposed on the inner walls of the reflectors.
Implementation Method 2
The light guide plate has a light emitting surface, a bottom surface and a light incident surface connecting the light emitting surface and the bottom surface.
Data Source
AI summary
A backlight module includes a light guide plate, a plurality of reflectors and a plurality of point light sources is provided. The light guide plate has a light emitting surface, a bottom surface and a light incident surface connecting the light emitting surface and the bottom surface. The plurality of reflectors is disposed beside the light incident surface, and the point light sources are disposed on the inner walls of the reflectors.