Backlight LED Arrangement for Narrow Bezel LCD
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in achieving a narrow bezel due to blind angles at the edge portions where light from LEDs does not enter, making it difficult to reduce the bezel width, especially in large-sized displays and multi-panel configurations.
Innovation Solution
The implementation of a liquid crystal display device design that includes a backlight unit with a first LED assembly, a diffusing plate, a reflecting plate, and an optical sheet, along with a main frame featuring a light guide bar and a second LED assembly positioned under the light guide bar to ensure uniform light distribution to the edge portions of the liquid crystal panel, reducing the bezel width and enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a direct light type backlight unit with LEDs is used, then the display area can be enlarged, but the bezel width increases due to blind angles at edge portions where light does not enter
Solution Approach 1:
The backlight unit is divided into multiple LED assemblies arranged in a matrix pattern, with additional LED assemblies positioned at corner portions. This segmentation allows light to be emitted from multiple directions, covering the blind angles at edge portions and enabling a narrower bezel while maintaining large display area.
Solution Approach 2:
LED assemblies are positioned not only in the main display area but also at corner portions and edge regions, utilizing three-dimensional spatial arrangement. This dimensional expansion of LED placement ensures comprehensive light coverage across the entire liquid crystal panel, eliminating blind spots at edges and reducing bezel width.
2Illumination intensity
If LEDs are arranged in a matrix pattern, then light coverage is improved, but device complexity increases
Solution Approach 1:
The corner LED assemblies serve multiple functions: they illuminate corner regions, cover blind angles at adjacent edges, and contribute to overall light uniformity. This multi-functionality reduces the need for separate edge-specific lighting components, simplifying the overall structure despite the increased number of LED assemblies.
Solution Approach 2:
The corner LED assemblies are integrated into the same backlight unit structure as the matrix LED assemblies, sharing common support frames, optical sheets, and control systems. This merging approach consolidates multiple lighting functions into a unified structure, reducing overall device complexity.
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 design achieves uniform light supply to the entire liquid crystal panel, increasing brightness and reducing the non-display region of the bezel, thereby obtaining a narrow bezel and minimizing image severance phenomena in multi-panel displays.
Implementation Method 1
a light guide bar protruding from an inner surface of the vertical part, the second LED assembly disposed under the light guide bar
Implementation Method 2
a diffusing plate, a reflecting plate and an optical sheet
Implementation Method 3
a diffusing plate, a reflecting plate and an optical sheet
Data Source
AI summary
A backplate having a folding region and an unfolding region adjacent to the folding region includes: first and second material layers corresponding to the folding and unfolding regions; and a third material layer between the first and second material layers, the third material layer is more rigid than the first and second materials layers, wherein the first and second material layers extend from the folding region to the unfolding regions such that a thickness of the first and second material layers is gradually reduced from the folding region to the unfolding region.