Backlight Module Light Guiding Plate Microstructures
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Solution Overview
Problem
Conventional backlight modules for LCD displays often suffer from uneven luminance, leading to hot spots near the edge regions, which degrade display quality and competitiveness.
Innovation Solution
A backlight module design featuring a light guiding plate with microstructures in the near-light region, optimized by specific equations relating the microstructure dimensions, pitch of light emitting elements, and projection distance, to achieve uniform luminance and reduce hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight modules are used, then the structure is simple, but hot spots occur at the edge portion due to uneven luminance
Solution Approach 1:
The patent applies local quality by introducing microstructures only in the near-light region (edge portion) of the light guiding plate where hot spots occur, while keeping the rest of the plate smooth. This localized modification specifically addresses the luminance uniformity problem at the edges without unnecessarily complicating the entire structure.
Solution Approach 2:
The patent changes the physical parameters of the light guiding plate by introducing microstructures with specific dimensional ratios (height to width between 0.05 and 0.5) and geometric shapes (triangle, trapezoid, pentagon, heptagon, or polygon). These parameter changes enable control over light scattering and refraction to achieve uniform luminance output.
2Illumination intensity
If microstructures are added to the light guiding plate, then luminance uniformity improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies dimensional parameters for the microstructures, including height (H) between 50-500 μm, width (P) between 100-3000 μm, and height-to-width ratio between 0.05 and 0.5. These parameter ranges balance manufacturing feasibility with achieving sufficient luminance uniformity, avoiding excessively tight tolerances while still improving the hot spot problem.
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 design enhances luminance uniformity and reduces hot spots, improving display quality and competitiveness by ensuring even light output across the LCD panel.
Implementation Method 1
a light guiding plate with microstructures in the near-light region
Data Source
AI summary
A backlight module includes a plurality of first light emitting elements and a light guiding plate including a first side, a second side and a light output side having microstructures at least disposed in a near-light region of the light guiding plate. The near-light region is defined as from a first line to a predetermined second line at the light output side. The microstructure has a width P and height H, the light-guiding plate has a thickness T, a pitch between the adjacent first light-emitting elements is defined as PLED, a projection distance from a luminance measuring line of the backlight module to the first light-emitting elements is defined as A. Under the conditions 0<A≦120 mm, 0<[(H/P)/T]*PLED≦15 and 0<luminance variation≦100%, the structure characteristic of the backlight module is bounded by a first equation: A=0.2{[(H/P)/T]*PLED}2−2{[(H/P)/T]*PLED}+105 mm and a second equation: A=0.2{[(H/P)/T]*PLED}2−2{[(H/P)/T]*PLED}+0.1 mm.