Backlight Unit Sheet Guide for Thin Bezel Light Leakage Prevention
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Solution Overview
Problem
Conventional liquid crystal display devices with thin bezels face optical defects such as light leakage due to insufficient distance between light sources and the diffusion plate, leading to image display defects and reduced product reliability.
Innovation Solution
A backlight unit design featuring a light source fixing unit mounted on the inner side of a bottom cover, a diffusion plate with a light entry plane, and a sheet guide on the front surface of the bottom cover that surrounds the edges, with optical sheets disposed on the sheet guide and separated from the diffusion plate to prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bezel thickness is reduced to meet thin design trends, then the aesthetic appearance and modern design are improved, but the distance between light sources and diffusion plate is narrowed causing optical defects such as light leakage and light beam formation
Solution Approach 1:
The patent introduces a new spatial dimension by positioning optical sheets on the side surface of the diffusion plate rather than directly on the front surface. This lateral arrangement creates an additional optical path dimension that allows light to reach the display panel without requiring sufficient distance between light sources and diffusion plate, thereby resolving the contradiction between thin bezel design and prevention of optical defects
Solution Approach 2:
The patent introduces optical sheets as intermediary elements that mediate between the diffusion plate and the display panel. These optical sheets receive light from the diffusion plate and guide it toward the display panel, preventing direct observation of light source characteristics and eliminating optical defects like light leakage and light beam formation while maintaining thin bezel design
2Device complexity
If diffusion sheets are disposed directly on the diffusion plate, then the structure is simplified, but optical defects such as light beams and light leakage occur when bezel thickness is reduced
Solution Approach 1:
The patent relocates optical sheets from the traditional position directly on the diffusion plate front surface to the side surface of the diffusion plate. This dimensional change creates a lateral light guidance path that prevents optical defects while maintaining structural simplicity, as the optical sheets are still directly associated with the diffusion plate but in a different spatial configuration
Solution Approach 2:
The patent segments the optical system into distinct functional components: the diffusion plate for light diffusion, the optical sheets for light guidance and correction, and the display panel for image display. This segmentation allows each component to perform its specific function optimally, with optical sheets positioned on the side surface to correct optical defects without complicating the overall structure
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 effectively prevents optical defects like light leakage, allowing for a minimized bezel thickness while maintaining image quality and enhancing product reliability.
Implementation Method 1
a diffusion plate receiving light incident from the plurality of light sources through a light entry plane formed on one side surface of the diffusion plate, changing the progress direction of light into a forward direction, and then emitting light in the forward direction
Implementation Method 2
a plurality of optical sheets disposed on the sheet guide and separated from the diffusion plate to perpendicularly emit light from the diffusion plate
Data Source
AI summary
Disclosed are a backlight unit, an assembly structure of which is modified to minimize the thickness of a bezel and to prevent optical defects, such as light leakage, and a liquid crystal display device using the backlight unit. The liquid crystal display device includes a liquid crystal panel, at least one light source fixing unit on which plural light sources are mounted and which is fixed to the inner side surface of a bottom cover, a diffusion plate receiving light from the plural light sources through a light entry plane and changing the progress direction of light into a forward direction, a sheet guide formed on the front surface of the bottom cover in a shape in which the inside of the sheet guide is opened, and plural optical sheets disposed on the sheet guide and separated from the diffusion plate to perpendicularly emit light from the diffusion plate.