Reflective Sheet Segmentation for Narrow Border Backlight Stability
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Solution Overview
Problem
The narrow border design in electronic devices leads to reduced bonding strength between the reflective sheet and the plastic frame in backlight modules, causing instability and potential detachment of the reflective sheet.
Innovation Solution
A reflective sheet with three portions is designed, where the first portion adheres to the bottom of the light guiding plate or plastic frame, the second portion adheres to the lateral side of the plastic frame via double-sided adhesive, and the third portion adheres to the top surface of the plastic frame, with corresponding protrusions and openings for secure engagement, ensuring stable adhesion even with narrow frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the plastic frame width is reduced to achieve narrow border design, then the device border becomes narrower, but the bonding surface area between the reflective sheet and the plastic frame decreases, reducing bonding strength
Solution Approach 1:
The reflective sheet is divided into three distinct portions (first, second, and third portions) that are bonded to different surfaces of the plastic frame. This segmentation allows the bonding function to be distributed across multiple locations, compensating for the reduced bonding surface area caused by the narrow frame width.
Solution Approach 2:
The bonding approach transitions from a single-plane bonding configuration to a multi-dimensional bonding structure. The reflective sheet is bonded to the top surface, bottom surface, and lateral side of the plastic frame, utilizing three-dimensional space to achieve stable fixation despite the reduced frame width.
2Length of stationary object
If the plastic frame width is reduced to achieve narrow border design, then the device border becomes narrower, but the bonding stability between the reflective sheet and the plastic frame deteriorates, causing potential detachment
Solution Approach 1:
The reflective sheet is divided into three distinct portions (first, second, and third portions) that are bonded to different surfaces of the plastic frame. This segmentation allows the bonding function to be distributed across multiple locations, compensating for the reduced bonding surface area caused by the narrow frame width.
Solution Approach 2:
Multiple bonding methods are combined in this invention: adhesive bonding is applied to the first portion (bottom surface), while mechanical engagement via protrusions and openings is used for the third portion (top surface). This combination of bonding mechanisms enhances overall bonding stability and prevents detachment.
3Length of stationary object
If the plastic frame width is reduced to achieve narrow border design, then the device border becomes narrower, but the adhesion area between the reflective sheet and the plastic frame decreases, leading to unstable bonding
Solution Approach 1:
The bonding approach transitions from a single-plane bonding configuration to a multi-dimensional bonding structure. The reflective sheet is bonded to the top surface, bottom surface, and lateral side of the plastic frame, utilizing three-dimensional space to achieve stable fixation despite the reduced frame width.
Solution Approach 2:
Multiple bonding methods are combined in this invention: adhesive bonding is applied to the first portion (bottom surface), while mechanical engagement via protrusions and openings is used for the third portion (top surface). This combination of bonding mechanisms enhances overall bonding stability and prevents detachment.
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 configuration prevents the reflective sheet from detaching, maintaining stability and adhesion to the plastic frame, even in narrow border designs, thereby enhancing the reliability of the backlight module.
Implementation Method 1
The reflective sheet within the backlight module is usually adhered to a bottom surface of the plastic frame via double-sided adhesive
Implementation Method 2
the top surface of the plastic frame includes a plurality of corresponding protrusions, during an assembling process, the protrusions of the top surface of the plastic frame engage with the openings of the third portion of the reflective sheet
Data Source
AI summary
A backlight module and a liquid crystal device (LCD) are disclosed. The backlight module includes a light guiding plate, a plastic frame adjacent to a lateral side of the light guiding plate, and a reflective sheet. The reflective sheet includes a first portion, a second portion, and a third portion. The first portion of the reflective sheet is arranged below a bottom of the light guiding plate and/or a bottom of the plastic frame, the second portion of the reflective sheet adheres to a lateral side of the plastic frame, and the lateral side faces away from the light guiding plate, and the third portion of the reflective sheet adheres to a top surface of the plastic frame. With such configuration, the reflective sheet may be stably fixed on the plastic frame to prevent the reflective sheet from being detached.