LED Backlight Diffusion Plate with Disconnected Ring Openings
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Solution Overview
Problem
As LCD devices increase in size, the weight and sagging of the diffusion plate in the backlight unit become issues, contradicting the trend of reducing the overall weight of the display device.
Innovation Solution
Incorporating a diffusion plate with opening portions corresponding to the LEDs, arranged in specific patterns such as stripe or honeycomb, to reduce the weight and prevent sagging while ensuring uniform light distribution to the liquid crystal panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the diffusion plate size is increased to match larger LCD devices, then the light coverage area is improved, but the weight increases causing the plate to sag
Solution Approach 1:
The diffusion plate is divided into multiple separate plates (first diffusion plate and second diffusion plate) arranged in different layers. This segmentation reduces the weight of each individual plate while maintaining sufficient light coverage area through the layered arrangement, preventing sagging while achieving adequate illumination.
Solution Approach 2:
The diffusion function is extended from a single two-dimensional plane to a three-dimensional layered structure. By stacking multiple diffusion plates at different positions, the patent achieves comprehensive light coverage without requiring a single large, heavy plate, thus solving the sagging problem while maintaining coverage.
2Weight of stationary object
If the diffusion plate weight is reduced to prevent sagging, then the device weight is decreased, but the light distribution uniformity may be compromised
Solution Approach 1:
By dividing the diffusion function across multiple lightweight plates rather than using one heavy plate, each plate can be optimized for uniform light distribution while the combined effect of stacked plates maintains overall uniformity across the entire display area.
Solution Approach 2:
Each diffusion plate in the stack can be positioned and designed to address specific local lighting requirements, with the cumulative effect of multiple plates achieving uniform overall light distribution while keeping individual plates lightweight.
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 effectively decreases the weight of the diffusion plate and the LCD device, preventing sagging and maintaining high-quality uniform light supply to the panel, thus enhancing display quality and aligning with the goal of reducing device weight.
Implementation Method 1
at least one light emitting diode
Implementation Method 2
a diffusion plate over the at least one light emitting diode
Data Source
AI summary
A backlight unit includes at least one light emitting diode; and a diffusion plate over the at least one light emitting diode and including at least one opening portion corresponding to the at least one light emitting diode, wherein the at least one opening portion has a disconnected ring shape, and the diffusion plate further includes a first portion directly above the at least one light emitting diode and surrounded by the at least one opening portion, a second portion surrounding the at least one opening portion, and a third portion coupling the first and second portions.