Asymmetric Optical Structures for Backlight Light Utilization
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Solution Overview
Problem
Conventional light guide plates in backlight modules suffer from inefficient light utilization and uneven light distribution due to the design of microstructures on the reflecting surface, leading to energy loss and a messy viewing angle, as most light reflected by the first surface cannot be used by the turning film.
Innovation Solution
The light guide plate features optical structures with non-symmetrical shapes, where the first optical active surface is inclined at a smaller angle relative to the optical surface compared to the second, allowing for exponential decrease in light-emitting angles, and is designed in conjunction with a prism film to optimize light emission angles for better utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional microstructures with first included angle of 40-60 degrees are used on the reflecting surface, then light reflection is increased, but light utilization rate decreases and viewing angle becomes messy
Solution Approach 1:
The patent applies asymmetry by designing the optical structures with a non-symmetrical triangular cross-section where the first inclined surface has a first included angle and the second inclined surface has a second included angle, with the first included angle being different from the second included angle. This asymmetric design allows differentiated control of light reflection angles for different light paths, enabling the turning film to effectively utilize reflected light while maintaining high reflection efficiency.
2Illumination intensity
If conventional microstructures are designed with larger second surface area, then light reflection is enhanced, but light distribution uniformity deteriorates
Solution Approach 1:
The patent applies local quality by designing different regions of the optical structures with different geometric characteristics. The first inclined surface and second inclined surface have different included angles, creating localized variations in light reflection properties. This allows different parts of the structure to perform specialized functions: the first inclined surface optimizes for turning film light utilization while the second inclined surface controls overall reflection intensity, achieving both high reflection and uniform distribution.
3Ease of operation
If light beam reflects off the first surface of microstructures, then light can exit the light guide plate, but light utilization by turning film is lost
Solution Approach 1:
The patent applies segmentation by dividing the optical structure into distinct functional surfaces: the first inclined surface and the second inclined surface. The first inclined surface is specifically designed to reflect light toward the turning film at optimal angles, while the second inclined surface handles other reflection functions. This segmentation allows the turning film to capture and utilize light that would otherwise be lost, converting previously wasted light paths into useful illumination.
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 increases the light utilization rate and uniformity of light emission, enabling more concentrated and directed light output that can be effectively used by the prism film, resulting in improved viewing angles and reduced energy loss.
Implementation Method 1
The first optical active surface and the second optical active surface are inclined towards different directions... A first inclined angle is formed between the first optical active surface and the optical surface, and a second inclined angle is formed between the second optical active surface and the optical surface
Data Source
AI summary
A light guide plate, a backlight module and a display device are provided. The light guide plate includes a main body and optical structures. The main body has a light-incident surface, an opposite light-incident surface, and an optical surface. The optical structures are disposed on the optical surface. Each of the optical structures has a first optical active surface and a second optical active surface, and the first optical active surface and the second optical active surface are inclined towards different directions and formed in a non-symmetrical shape. A first inclined angle is formed between the first optical active surface and the optical surface. A second inclined angle is formed between the second optical active surface and the optical surface. The first included angle is greater than the second included angle, and a light-emitting angle of the light guide plate decreases exponentially with the first inclined angle.