Backlight Module Optic Film Constraint Portion Design
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Solution Overview
Problem
In liquid crystal display devices, the large engagement area between the liquid crystal screen and double-sided adhesive tape and the small engagement area between the optic film and the tape lead to residual adhesive and damage during reworking, resulting in reduced production yield and quality.
Innovation Solution
A backlight module design featuring an optic film with a constraint portion comprising an extension section, connection section, and support section, which defines a U-shaped configuration, and is secured by a double-sided adhesive tape, ensuring balanced bonding strengths between the optic film and the liquid crystal panel, thereby preventing damage during assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the liquid crystal display screen is fixed to the backlight unit by a double-sided adhesive tape with a large engagement area, then the bonding strength is improved, but the adhesive tape leaves residual on the panel and causes damage during reworking
Solution Approach 1:
The patent divides the engagement area into two distinct parts: a first engagement area between the double-sided adhesive tape and the liquid crystal display screen, and a second engagement area between the double-sided adhesive tape and the optic film. This segmentation allows each area to have optimized dimensions, where the first engagement area is larger to provide strong bonding for the heavy screen, while the second engagement area is smaller to minimize adhesive residue and damage risk during reworking.
2Device complexity
If the optic film is fixed with a small engagement area of double-sided adhesive tape, then the device complexity is reduced, but the optic film easily shifts or gets damaged by scraping
Solution Approach 1:
The patent applies local quality by creating a constrained configuration where the optic film is positioned between the mold frame and the light guide plate, with the double-sided adhesive tape forming a specific engagement pattern. This localized structural arrangement provides enhanced stability and protection to the optic film at critical areas without requiring complex overall fixing structures.
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 enhances the stability and quality of the optic film, maintaining balanced bonding strengths and preventing damage during assembly and disassembly, thus improving the production yield and quality of the display device.
Implementation Method 1
the double-sided adhesive tape being arranged on an edge portion of the second layer connected to the extension section and the extension section
Data Source
AI summary
A backlight module includes a backplane, a mold frame, a light guide plate, and an optic film. The optic film includes a first layer and a second layer stacked on the first layer and including a constraint portion including an extension section, a connection section, and a support section parallel with and opposite to the extension section. The connection section connects between the support section and the extension section. The extension section extends from an end of the second layer. The optic film is stacked on the light guide plate with the first layer engaging the light guide plate. The mold frame surrounds the light guide plate and the first layer and is received in the backplane. The connection section is located outside opposite sides of the backplane. The mold frame and the opposite sides of the backplane are received and retained between the support section and the extension section.