Backlight Adhesive Integration for Slim LCD Warping
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Solution Overview
Problem
Liquid crystal display devices face challenges in slimming due to the thickness of double-faced tape and gaps between the liquid crystal display panel and the optical sheet, which can cause warping and affect display quality.
Innovation Solution
A backlight device configuration with a case, light guide, and multiple optical sheets, where the adhesive is divided into two types to be stacked with the optical sheets, allowing the adhesive thickness to be integrated into the light guide and optical sheets, eliminating the gap between the optical sheet and the display panel, thus slimming the device and preventing warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-faced tape is used to attach the optical sheet to the liquid crystal display panel, then the optical sheet can be securely fixed, but the device thickness increases and a gap is formed between the optical sheet and the panel
Solution Approach 1:
The adhesive layer is merged with the light guide plate and optical sheets by making their thicknesses equal, creating an integrated structure where the adhesive becomes part of the optical component stack rather than a separate element. This eliminates the need for additional double-faced tape and removes gaps between components.
Solution Approach 2:
The adhesive layer is nested within the thickness of the light guide plate and optical sheets, with all components stacked in sequence from the liquid crystal display panel upward. The adhesive is positioned between the light guide plate and optical sheets, fully contained within the overall structure rather than adding external thickness.
2Reliability
If a double-faced tape is used to attach the optical sheet, then secure fixation is achieved, but warping occurs under load due to the gap formed
Solution Approach 1:
By merging the adhesive layer with the light guide plate and optical sheets into a single integrated stack with equal thicknesses, the structure becomes more rigid and resistant to warping under load, while maintaining secure fixation between components.
3Length of stationary object
If the adhesive thickness is integrated into the light guide and optical sheets, then the device can be slimmed and gaps eliminated, but the adhesive must be precisely positioned and stacked
Solution Approach 1:
The optical assembly is segmented into distinct layers (light guide plate, optical sheets, adhesive layer) with clearly defined interfaces and equal thicknesses. This segmentation allows for precise positioning and stacking during assembly, with each layer contributing to the overall slim profile while maintaining manufacturability through standardized layering.
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 enables a slimmer display device by integrating adhesive thickness into the light guide and optical sheets, removing the gap between the optical sheet and the display panel, enhancing display quality by preventing warping under load.
Implementation Method 1
a first adhesive provided between the case and at least one of the first optical sheet and the second optical sheet, to stick at least one of the optical sheets to the case
Data Source
AI summary
According to one embodiment, a backlight device includes a case, a light guide in the case, a first optical sheet on the light guide, a second optical sheet on the first optical sheet, a first adhesive provided between the case and at least one of the first optical sheet and the second optical sheet, to stick at least one of the optical sheets to the case, and a light source in the case, configured to radiate light to the light guide.