Backlight Module with V-Shaped Microstructures for Light Cone Control
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Solution Overview
Problem
Existing backlight modules face challenges in controlling the size and shape of the light-emitting cone to achieve a uniform light distribution while switching the direction of the light cone, which is essential for applications like virtual reality and light field displays, and often require additional optical films that increase costs.
Innovation Solution
A backlight module design featuring a light guide plate with concentric ring-like V-shaped microstructures and a first optical film with concentric ring-like V-shaped microstructures, allowing for the alignment of the light source with the center of the microstructures to achieve a highly collimated light shape and directionally adjustable light cone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If additional optical films are added to achieve a symmetrical light shape, then the light distribution uniformity is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the light guiding function and the light shaping function into a single light guide plate by integrating concentric ring-like V-shaped microstructures directly into the plate. This eliminates the need for separate optical films to achieve symmetrical light distribution, thereby reducing manufacturing cost while maintaining uniform light shape.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: it guides light from the light source and simultaneously shapes the light into a uniform symmetrical cone through its integrated microstructures. This multi-functionality removes the need for additional specialized optical components.
2Use of energy by moving object
If the light-emitting cone angle is reduced to reduce power consumption and stray light, then power consumption is reduced, but the imaging NA value requirement may not be met
Solution Approach 1:
The patent enables dynamic adjustment of the light-emitting cone angle through the specific design of V-shaped microstructures with adjustable parameters. The cone angle can be optimized to precisely match the NA value required for imaging, ensuring that light is not wasted at excessive angles while maintaining sufficient illumination for high-quality imaging.
3Shape
If holograms are used instead of V-shaped microstructures to guide light, then a uniform light cone is achieved, but the dispersion characteristic makes it difficult to apply to white light
Solution Approach 1:
The patent uses V-shaped microstructures that create localized light guiding effects at each point along the concentric rings. This local light control mechanism is wavelength-agnostic and works effectively with broadband white light, unlike holographic approaches that are more sensitive to wavelength variations.
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 enables the generation of a uniform light cone that can be directionally adjusted, reducing stray light, increasing contrast, and minimizing power consumption, while avoiding the need for additional optical films, thus reducing costs and improving user experience.
Implementation Method 1
the bottom surface includes a plurality of concentric ring-like first V-shaped microstructures
Implementation Method 2
a light guide plate, a first light source, and a first optical film. The light guide plate includes a light incident surface, a light exiting surface
Implementation Method 3
The first optical film is disposed on a side of the light exiting surface of the light guide plate. The first optical film includes a plurality of concentric ring-like second V-shaped microstructures
Data Source
AI summary
A backlight module including a light guide plate, a first light source, and a first optical film is provided. The light guide plate has a light incident surface, a light exiting surface, and a bottom surface, where the light incident surface is connected between the light exiting surface and the bottom surface, the light exiting surface is opposite to the bottom surface, and the bottom surface has a plurality of concentric ring-like first V-shaped microstructures. The first light source is disposed on a side of the light incident surface of the light guide plate, where a center of circle of the first V-shaped microstructures is aligned with the first light source. The first optical film is disposed on a side of the light exiting surface of the light guide plate. The first optical film has a plurality of concentric ring-like second V-shaped microstructures.