Backlight Module Columnar Optical Structures Brightness
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Solution Overview
Problem
Existing backlight modules suffer from insufficient light emergent brightness and poor contrast due to excessive thickness and ineffective light distribution caused by multiple optical films, leading to inadequate light concentration at the front viewing angle.
Innovation Solution
The proposed backlight module incorporates a light-emitting element, a light guide plate, and two optical films with columnar optical structures. The first optical film diffuses incident light uniformly, while the second optical film reduces the emergent opening angle of light at both vertical and horizontal viewing angles, enhancing light concentration and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If many optical films are provided in the light emergent direction to increase light emergent brightness, then the light emergent brightness is improved, but the thickness of the backlight module becomes too thick
Solution Approach 1:
The patent extracts and eliminates unnecessary optical films from the backlight module structure. Instead of using multiple optical films to increase brightness, the invention uses a light guide plate with specific optical structures (first, second, and third columnar optical structures) that concentrate light in the forward direction, thereby reducing the number of components and the overall thickness while maintaining or improving brightness performance
Solution Approach 2:
The patent transitions from a planar arrangement of multiple optical films to a three-dimensional structure with columnar optical structures having specific axial directions. The first columnar optical structures have axial directions at angle A1 (≤90°) to the side surface, the second at angle A2 (≤90°) to the first axial directions, and the third at angle A3 (≤45°) to the first axial directions, creating a multi-dimensional light concentration effect that improves brightness without increasing thickness
2Illumination intensity
If many optical films are provided to increase light emergent brightness, then the brightness is improved, but the light emergent viewing angle cannot be effectively concentrated, resulting in insufficient brightness at front viewing angle and poor contrast
Solution Approach 1:
The patent applies different optical structures with specific geometric characteristics to different regions and functions within the light guide plate. The first columnar optical structures are optimized for diffusing incident light uniformly, the second for reducing emergent opening angle at vertical viewing angles, and the third for reducing emergent opening angle at horizontal viewing angles. This localized optimization ensures effective light concentration at the front viewing angle while maintaining uniform illumination
Solution Approach 2:
The patent segments the optical function into three distinct columnar optical structure types, each with specific axial directions and geometric characteristics. The first columnar optical structures have axial directions at angle A1 to the side surface, the second at angle A2 to the first axial directions, and the third at angle A3 to the first axial directions. This segmentation allows each structure to perform its specific function optimally, concentrating light effectively at the front viewing angle while maintaining overall brightness
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 effectively improves the emergent brightness and contrast at the forward viewing angle while reducing the module's thickness, addressing the limitations of prior art.
Implementation Method 1
The first columnar optical structure can diffuse an incident light beam, such that the light beam can be more uniformly incident to the second columnar optical structure
Implementation Method 2
the second columnar optical structure can reduce an emergent opening angle of the light beam at a vertical viewing angle
Implementation Method 3
the third columnar optical structure of the second optical film can reduce the emergent opening angle of the light beam at a horizontal viewing angle, such that the light beam approximately emerges in a forward direction
Implementation Method 4
a light guide plate, a first optical film, and a second optical film. The light guide plate has a light-inlet surface and a light-outlet surface connected to each other
Data Source
AI summary
A backlight module includes a light-emitting element, a light guide plate, a first optical film, and a second optical film. The first optical film has two opposite surfaces and a side surface located between the two surfaces. The side surface and the light-inlet surface are located on a same side of the backlight module. One of the two surfaces has a first columnar optical structure, and an included angle between a first axial direction of the first columnar optical structure and the side surface meets the following equation: A1≤90°. The other surface has a second columnar optical structure, and an included angle between a second axial direction and the first axial direction meets the equation: A2≤90°. The second optical film has a surface having a third columnar optical structure. An angle between an axial direction of the third columnar optical structure and the first axial direction meets the equation: A3≤45°.