Air Gap Between Light Guide and Optical Sheet
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Solution Overview
Problem
Liquid crystal display devices with small bezel widths are prone to hot spots due to luminance differences between light-emitted and non-emitted areas, and their optical sheet portions are susceptible to cracking or movement, leading to front luminance defects and reduced mechanical reliability.
Innovation Solution
A liquid crystal display device design that includes a light guiding plate with an optical sheet portion and a panel support member creating an air gap between the light guiding plate and the optical sheet portion, which minimizes hot spots and enhances mechanical reliability by scattering light and preventing optical sheet movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the optical sheet portion is disposed directly on the light guiding plate to reduce bezel width, then the bezel width is reduced, but hot spots occur due to luminance differences between light-emitted and non-emitted areas
Solution Approach 1:
An air gap is introduced as an intermediary layer between the light guiding plate and the optical sheet portion. This air gap acts as a mediator that scatters the light emitted from the light guiding plate, thereby reducing the luminance difference between light-emitted and non-emitted areas and preventing hot spots while maintaining the reduced bezel width design
2Ease of manufacture
If the optical sheet portion is not fixed on the light guiding plate to simplify assembly, then assembly is easier, but the optical sheet portion is susceptible to cracking or movement under vibration, reducing mechanical reliability
Solution Approach 1:
The air gap is designed to provide beforehand cushioning for the optical sheet portion. This cushioning effect absorbs and mitigates the impact of vibrations and mechanical stresses before they can cause cracking or movement of the optical sheet, thereby improving mechanical reliability while maintaining assembly simplicity
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 air gap between the light guiding plate and optical sheet portion ensures uniform luminance and prevents hot spots, improving the mechanical reliability and reducing luminance defects in liquid crystal display devices with small bezel widths.
Implementation Method 1
preparing an air gap between the light guiding plate and one edge portion of the optical sheet portion disposed on the light-incidence portion
Data Source
AI summary
Disclosed is a liquid crystal display device that may include a backlight unit including a light guiding plate with a light-incidence portion and an optical sheet portion disposed on the light guiding plate; and a panel support member for supporting a rear edge portion of a liquid crystal display panel, and preparing an air gap between the light guiding plate and one edge portion of the optical sheet portion disposed on the light-incidence portion, wherein it is possible to prevent defects of front luminance in the light-incidence portion with a small bezel width, and to improve mechanical reliability.