Backlight Module Dot Structures and Prism Layer for Polarization
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Solution Overview
Problem
Traditional backlight modules for LCDs lack efficient light emission efficiency and polarization, leading to suboptimal utilization of light and increased power consumption.
Innovation Solution
A backlight module design featuring a light guide plate with dot structures and a prism layer where the light emitted by the backlight source is incident at specific angles, including a Brewster angle, to maximize polarization and light utilization, enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional backlight modules are used, then the structure is simple and easy to manufacture, but the light emission efficiency is low and power consumption is high
Solution Approach 1:
The light guide plate is divided into multiple functional regions with different dot structures (first dot structures with first included angles and second dot structures with second included angles). This segmentation allows different regions to optimize light extraction and polarization for specific viewing angles, improving overall light emission efficiency while maintaining a relatively simple monolithic structure that is easy to manufacture.
Solution Approach 2:
Different regions of the light guide plate are equipped with dot structures having different included angles tailored to their specific functions. The first dot structures have first included angles optimized for certain viewing directions, while the second dot structures have second included angles for other directions. This local optimization of structural properties enhances light emission efficiency in different zones without requiring complete redesign of the entire module.
2Reliability
If traditional backlight modules are used, then the manufacturing process is simple, but the polarization degree is low and light utilization is poor
Solution Approach 1:
The dot structures are pre-configured with specific included angles during the light guide plate manufacturing process to predetermined values that optimize polarization. This preliminary action ensures that when light passes through the light guide plate, it achieves the desired polarization degree without requiring additional post-processing steps or complex assembly procedures, thus maintaining ease of manufacture while improving polarization performance.
3Productivity
If the light guide plate has uniform dot structures, then the manufacturing is easier, but the light extraction efficiency varies for different viewing angles
Solution Approach 1:
The light guide plate incorporates first dot structures with first included angles in certain regions and second dot structures with second included angles in other regions. Each dot structure type is locally optimized for its specific region's viewing angle requirements, maximizing light extraction efficiency for different directions while maintaining overall structural simplicity for manufacturing.
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 design achieves a higher degree of polarization and light utilization, improving light emission efficiency and reducing power consumption by ensuring that at least 50% of light is absorbed as polarized light, compared to previous designs.
Implementation Method 1
the light emitted by the backlight source is incident to the first inclined surface and then reflected to the second inclined surface of the first prism
Implementation Method 2
a first incident angle between incident light reflected to the second inclined surface of the first prism and a normal of the second inclined surface is a Brewster angle
Implementation Method 3
the first vertex angle is equal to a refraction angle of refracted light formed by the incident light penetrating through the second inclined surface
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes: a light guide plate, a first bottom surface of the light guide plate being provided with a plurality of dot structures, and the dot structure including a first inclined surface forming a first included angle with the first bottom surface; a backlight source located on a side of a light incident surface, light emitted by the backlight source being incident to the first inclined surface, and an included angle between the emitted light and a horizontal line being a second included angle; and a first prism layer located on the side of a light exiting surface of the light guide plate, the first prism layer having a plurality of first prisms provided in parallel with the light incident surface.