Light Guide Plate Scattering Dot Arrangement for Backlight Uniformity
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Solution Overview
Problem
Current light guide plates in backlight modules suffer from non-uniform brightness due to varying distances of light beams from the source to scattering dots, leading to inconsistent illumination across the discharge surface.
Innovation Solution
A light guide plate design featuring scattering dots arranged in concentric arcs and lines on the diffusing surface, with varying densities and sizes to ensure uniform light distribution, and optionally incorporating a light-reflective film on the side surfaces to enhance light reflection and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scattering dots are arranged evenly on the light diffusing surface, then the manufacturing process is simple, but the brightness uniformity deteriorates due to varying light propagation distances
Solution Approach 1:
The patent applies local quality by varying the density distribution of scattering dots across different regions of the light diffusing surface. Specifically, the first region (closer to light source) has lower scattering dot density while the second region (farther from light source) has higher density, creating non-uniform local properties that compensate for the non-uniform light propagation distances and achieve uniform overall brightness
Solution Approach 2:
The patent changes the parameter of scattering dot density from uniform to non-uniform distribution. By adjusting the density parameter spatially (lower in first region, higher in second region), the system compensates for the varying light path lengths and achieves uniform illumination output
2Illumination intensity
If scattering dots are arranged to compensate for light propagation distance variations, then brightness uniformity is improved, but the scattering dots arrangement becomes complex
Solution Approach 1:
The patent segments the light diffusing surface into two distinct regions (first region and second region) with different scattering dot density characteristics. This segmentation allows for simplified design within each region while achieving complex overall compensation effects, making the manufacturing process more manageable despite the non-uniform density requirement
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 arrangement of scattering dots on the light guide plate effectively scatters light beams to achieve improved uniformity of illumination across the discharge surface, enhancing the overall brightness and uniformity of the backlight module.
Implementation Method 1
a direction of the beams will change because of reflection and diffusion
Implementation Method 2
a direction of the beams will change because of reflection and diffusion
Data Source
AI summary
A light guide plate includes a light discharge surface, a light diffusing surface, a light incident surface, and a plurality of scattering dots. The light diffusing surface is located opposite to the light discharge surface. The light diffusing surface has a first part and a second part. The first part is adjacent to a light source. The light incident surface intersects with the light discharge surface and the light diffusing surface. The scattering dots within the first part are arranged in the form of a plurality of concentric arcs, and the scattering dots within the second part are arranged in the form of a plurality of lines.