Backlight Reflection Sheet Bonding for Narrow Frame Stability
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Solution Overview
Problem
The narrow plastic frame in backlight modules affects the bonding strength between the reflection sheet and the plastic frame, leading to unstable bonding and potential detachment due to external forces.
Innovation Solution
A reflection sheet with integral bodies extending towards the inner, upper, and outer surfaces of the plastic frame, fixedly bonded using double-sided adhesive, creating a semi-enclosed structure that securely attaches to the frame, preventing detachment and ensuring strong fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the plastic frame width is narrowed to achieve thinner borders, then the aesthetic appearance and compactness are improved, but the bonding strength between the reflection sheet and the plastic frame deteriorates, leading to unstable bonding and potential detachment
Solution Approach 1:
The reflection sheet is designed with an extended portion that protrudes toward the light source, adding a new spatial dimension to the bonding structure. This extension allows the reflection sheet to be positioned closer to the light guide plate while maintaining stable bonding, effectively resolving the contradiction between narrow frame width and sufficient bonding strength.
Solution Approach 2:
The extended portion of the reflection sheet acts as an intermediary element between the plastic frame and the light guide plate. It provides an additional bonding interface and structural support that compensates for the reduced frame width, ensuring stable fixation without requiring a wider frame.
2Ease of manufacture
If double-sided adhesive is used to bond the reflection sheet to the plastic frame, then the bonding process is simplified, but the bonding strength is insufficient under external forces, causing the reflection sheet to come loose
Solution Approach 1:
By extending the reflection sheet toward the light source in a new spatial direction, the design creates additional bonding surfaces and structural support. This dimensional extension enhances bonding reliability while maintaining the simplicity of using double-sided adhesive, as the extended structure provides mechanical reinforcement without complicating the bonding process.
Solution Approach 2:
The reflection sheet is segmented into a main body and an extended portion, each serving different functions. The extended portion specifically addresses bonding stability by providing additional attachment points and structural support, while the main body maintains optical functionality. This segmentation allows the use of simple adhesive bonding while achieving high reliability.
3Use of energy by moving object
If the reflection sheet is extended toward the light source, then the light utilization efficiency is improved, but the structural complexity increases
Solution Approach 1:
The extended portion of the reflection sheet serves multiple functions simultaneously: it acts as a reflective surface to improve light utilization efficiency, provides structural support for stable bonding, and creates additional bonding interfaces. This multi-functionality allows the design to improve light efficiency without proportionally increasing structural complexity, as one structural element accomplishes multiple objectives.
Solution Approach 2:
The design merges the reflective function and the bonding support function into a single integrated structure - the extended portion of the reflection sheet. By combining these functions into one element rather than adding separate components, the structural complexity is minimized while achieving improved light utilization and stable bonding simultaneously.
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 design maintains stable bonding even with a narrow frame, allowing for thinner borders and improved light utilization while meeting the requirements of both frame design and fixing strength.
Implementation Method 1
the reflection sheet 20 is bonded to a bottom surface of the plastic frame 10 by a double-sided adhesive 50
Data Source
AI summary
A backlight module is disclosed. The backlight module includes a reflection sheet including a first body and a second body; a light guide plate disposed on the first body of the reflection sheet; an optical film set disposed on the light guide plate; a plastic frame inside of which the reflection sheet, the light guide plate, and the optical film set are all disposed; and a connecting member configured to fixedly bond the second body to an inner side surface of the plastic frame. The present invention can ensure that the reflection sheet is fixedly bonded on the plastic frame well so that not only can a narrow frame design be achieved, but also the optical films can meet the requirement of fixing strength.