Backlight Module Fixing Frame with Segmented Adhesive Tapes
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Solution Overview
Problem
Existing display devices suffer from sheet wrinkle defects due to heat-expansion and cold-contraction issues, leading to uneven brightness and inferior display quality, particularly in large-sized modules where expansion space is limited.
Innovation Solution
A backlight module with a fixing frame that includes multiple edge frames with adhesive tapes and hanging lug holes, allowing for independent expansion and contraction of optical elements, reducing stress and preventing wrinkles through strategic placement of recess regions and adhesive tapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-area film sheet is used in large-sized display modules, then the screen-to-body ratio can be improved, but the film sheet will wrinkle due to heat-expansion and cold-contraction
Solution Approach 1:
The fixing frame is divided into multiple independent edge frames (first, second, third, and fourth edge frames) that are oppositely arranged. Each edge frame independently fixes portions of the optical element, allowing segmented constraint that accommodates thermal expansion and contraction without causing wrinkles across the entire film sheet.
Solution Approach 2:
Adhesive tapes are selectively placed at specific locations on the edge frames rather than uniformly across the entire frame. The adhesive tapes extend in the extension direction of each edge frame and are positioned to provide localized fixing while allowing other areas to expand freely, thus preventing wrinkles while maintaining necessary structural support.
2Length of stationary object
If the film sheet is constrained to maintain screen-to-body ratio, then the device size can be controlled, but the film sheet will wrinkle due to limited expansion space
Solution Approach 1:
The fixing structure transitions from a rigid, fully constrained system to a dynamic system where the adhesive tapes on the edge frames allow controlled movement. The adhesive tapes can accommodate expansion and contraction forces while maintaining the overall device dimensions, enabling the film sheet to dynamically adjust to thermal changes without wrinkling.
Solution Approach 2:
The adhesive tapes serve as intermediary elements between the optical element and the fixing frame. They provide a compliant connection that mediates the conflict between maintaining device size constraints and allowing thermal expansion, absorbing stress without transmitting it to the film sheet in a way that causes wrinkles.
3Strength
If adhesive tapes are placed to fix the optical element, then the element can be securely mounted, but stress concentration may cause wrinkles
Solution Approach 1:
The fixing strength is distributed across multiple independent adhesive tapes on four different edge frames rather than concentrated in a single location. This segmentation of the fixing system reduces stress concentration at any one point, preventing wrinkles while maintaining overall mounting strength.
Solution Approach 2:
Multiple edge frames with adhesive tapes work together in combination to provide distributed support. The first, second, third, and fourth edge frames collectively share the fixing load, merging their individual contributions to create a balanced stress distribution that prevents localized stress concentration and film sheet wrinkling.
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 effectively prevents sheet wrinkles and enhances display quality by allowing optical elements to expand and contract freely, reducing interference with the fixing frame and maintaining stability, thus improving the screen-to-body ratio and overall display performance.
Implementation Method 1
A side of each edge frame of the fixing frame facing the first optical element is provided with a plurality of adhesive tapes that are independent of each other and extend in an extension direction of the each edge frame. The first optical element is fixed to the fixing frame through the adhesive tapes.
Implementation Method 2
An optical film sheet of an existing display device is highly likely to wrinkle due to heat-expansion and cold-contraction
Implementation Method 3
An optical film sheet of an existing display device is highly likely to wrinkle due to heat-expansion and cold-contraction
Data Source
AI summary
A backlight module includes: a first optical element and a fixing frame arranged around the first optical element. The fixing frame includes a first edge frame and a second edge frame that are oppositely arranged, and a third edge frame and a fourth edge frame that are oppositely arranged. The side of each edge frame of the fixing frame facing the first optical element is provided with a plurality of adhesive tapes that are independent of each other and extend in an extension direction of the each edge frame. The first optical element is fixed to the fixing frame through the adhesive tapes.