Curved Backlight Reflective Plate Microstructure Angle Variation
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Solution Overview
Problem
Curved backlight modules experience uneven brightness along the orthogonal direction due to microstructures with light-emitting directions perpendicular to the tangent planes of light guide plates, which are optimized for flat modules.
Innovation Solution
A backlight module design featuring a light guide plate and a reflective plate with microstructures arranged along a curved direction, where the first angle between the reflective surface and the main surface of each microstructure varies between reflective units to ensure uniform illumination, with specific angle ranges and configurations to guide light efficiently to a viewing plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microstructures with light-emitting direction perpendicular to tangent planes are used, then illumination is optimized for flat backlight modules, but uneven brightness occurs in curved backlight modules
Solution Approach 1:
The patent applies local quality by making the first angle of microstructures vary across different reflective units. Specifically, reflective units at different positions along the curved direction have different first angles (e.g., 12-22 degrees at outer edges, 30-40 degrees at center), allowing each local region to optimize light emission according to its specific geometric characteristics and viewing angles.
Solution Approach 2:
The patent applies spheroidality by configuring the reflective plate with a curved surface and arranging reflective units along a curved direction. The microstructures are oriented at specific first angles relative to the main surface of each reflective unit, creating a curved light emission pattern that matches the curved geometry of the backlight module, thereby achieving uniform brightness across the curved surface.
2Illumination intensity
If first angles of microstructures are made different across reflective units, then uniform brightness is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the reflective plate into multiple reflective units arranged along the curved direction. Each reflective unit contains microstructures with a specific first angle, and adjacent reflective units have different first angles. This segmentation allows independent optimization of each unit while maintaining overall system performance.
Solution Approach 2:
The patent applies parameter changes by systematically varying the first angle parameter across different reflective units. The first angle ranges from about 12 degrees to about 40 degrees depending on the position of the reflective unit along the curved direction, creating a gradient of optical parameters that achieves uniform brightness distribution.
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 achieves uniform brightness and increases optical flux by 1.6 times compared to typical microstructures, addressing the issue of uneven brightness in curved backlight modules.
Implementation Method 1
Each of the microstructures has a reflective surface. A first angle is included between the reflective surface of each of the microstructures and the main surface of the body.
Data Source
AI summary
A backlight module includes a light guide plate, at least one light source, and a reflective plate. The light source is configured for emitting light toward the light guide plate. The reflective plate has a plurality of reflective units arranging along a curved direction. Each of the reflective units includes a body and a plurality of microstructures. The body has a main surface facing the light guide plate. The plurality of microstructures are disposed on the main surface of the body. Each of the microstructures has a reflective surface. A first angle is included between the reflective surface of each of the microstructures and the main surface of the body. The first angles of the microstructures in one reflective unit are different from the first angles of the microstructures in an adjacent reflective unit.