Direct Backlight Unit Support Structure Design for Light Uniformity
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Solution Overview
Problem
Conventional direct-type backlight units suffer from a dark area problem on the diffusion plate due to the presence of support structures in the light path, which affects image quality.
Innovation Solution
The design includes a direct-type backlight unit with support structures positioned between adjacent LEDs, where the height of each support structure is smaller than the distance between the bottom plate and the diffusion plate, ensuring a spacing that allows light to pass through, thus minimizing the dark area. The support structures are made of rigid materials like acrylic, plastic, or metal, with various surface and cross-sectional shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If support structures are placed in the light path to support the diffusion plate, then the diffusion plate is prevented from deforming due to thermal expansion and handling, but dark areas occur on the diffusion plate affecting image quality
Solution Approach 1:
The support structures are extracted from the light path by positioning them at the periphery of the cavity, allowing light to pass through the central region without obstruction while still providing necessary support for the diffusion plate
Solution Approach 2:
The support structures are positioned in the peripheral region rather than in the central light path, utilizing the spatial dimension to separate the support function from the light transmission path
2Ease of operation
If conventional support structures are used to hold the diffusion plate, then the plate is supported during handling and thermal expansion, but the support structures block light and create dark areas
Solution Approach 1:
The cavity is segmented into a central light transmission region and a peripheral support region, with support structures located only in the peripheral area, allowing both light transmission and structural support to function independently without interference
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 enhances light transmission by reducing the support structure height, eliminating the dark area on the diffusion plate and improving image quality in liquid crystal display devices.
Implementation Method 1
a plurality of light emitted diodes disposed between the diffusion plate and the bottom plate
Data Source
AI summary
A direct type backlight unit includes an optical film, a diffusion plate for supporting the optical film, a bottom plate disposed under the diffusion plate, a plurality of light emitted diodes disposed between the diffusion plate and the bottom plate, and a plurality of support structures disposed between the diffusion plate and the bottom plate and fixed on the bottom plate, wherein each support structure is disposed between two adjacent light emitting diodes, a height of each support structure is smaller than a distance between the bottom plate and the diffusion plate. The direct type backlight unit can improve the problem that a dark area occurs on the diffusion plate.