Backlight Assembly Light Guide Plate Collimated Light
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Solution Overview
Problem
Edge-illumination backlight assemblies struggle to provide collimated light, making them unsuitable for active viewing angle liquid crystal display (LCD), color-filterless LCD, and stereoscopic LCD applications due to their wide light emitting angles.
Innovation Solution
A backlight assembly featuring a light guide plate with a concavo-convex opposite surface that converts incident light into collimated light, combined with a light source and light source lens part, allowing for controlled viewing angles and stereoscopic image display, and divided into multiple light guide blocks to reduce bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional edge-illumination backlight assembly is used, then the structure is simple and easy to manufacture, but the light emitting angle is wide which prevents use in collimated light applications
Solution Approach 1:
The light guide plate is divided into multiple light guide blocks (first light guide block, second light guide block, etc.) arranged in the light incident direction. Each light guide block has its opposite surface with a specific curved shape (first curved shape, second curved shape) that controls the light emission angle. This segmentation allows independent optimization of each block's optical properties while maintaining overall manufacturing simplicity.
Solution Approach 2:
Different regions of the light guide plate are given different local properties through the curved shapes on the opposite surfaces of different light guide blocks. The first curved shape on the first light guide block and the second curved shape on the second light guide block create different light emission characteristics in different spatial regions, enabling collimated light output while maintaining the overall simple edge-illumination structure.
2Length of stationary object
If the light guide plate is divided into multiple light guide blocks, then the bezel size is reduced, but the device complexity increases
Solution Approach 1:
The light guide plate is segmented into multiple light guide blocks that can be independently manufactured and then assembled. This segmentation allows for reduced bezel size through optimized block dimensions while distributing the manufacturing complexity across multiple simpler units rather than one complex monolithic structure.
Solution Approach 2:
Multiple light guide blocks are combined to form a single integrated light guide plate assembly. The first light guide block, second light guide block, and other blocks are merged together with their respective curved surfaces to create a functional unit that reduces bezel size while the modular nature helps manage complexity through standardized assembly procedures.
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 enables improved viewing angles and efficient collimated light emission, facilitating the use of edge-illumination backlight assemblies in various LCD applications, including stereoscopic displays, while minimizing bezel width.
Implementation Method 1
The opposite surface is opposite to the light incident surface, has rounded portion, such as, for example, a convex shape with respect to the light incident surface, and reflects the first light beam and converts the first light beam into a second light beam that is collimated
Implementation Method 2
An edge-illumination backlight assembly includes a light guide plate that has an incident surface adjacent to which a line light source, such as a cold cathode fluorescent lamp (CCFL), or a point light source, such as a light emitting diode (LED), is disposed, an opposite surface that is positioned opposite to the incident surface and receives light from the light source
Data Source
AI summary
The backlight assembly includes a light source part and a light guide plate. The light source part generates a first light beam. The light guide plate has a plurality of light guide blocks. Each of the light guide blocks has a light incident surface, an opposite surface, a light emitting surface, and an inclined surface. The light incident surface receives the first light beam. The opposite surface is located opposite to the light incident surface, has a convex shape with respect to the light incident surface, and reflects the first light beam and converts the first light beam into a second light beam. The light emitting surface emits the second light beam. The inclined surface is inclined with respect to the light emitting surface.