Backlight Module Fitting Member Eliminates Tape Adhesion

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Solution Overview

Problem

Conventional backlight modules face challenges with the laborious and time-consuming application of silicon resin tape for attaching backlight films, which results in poor adhesion, thermal expansion issues leading to wavy structures, and increased production costs due to varying tape dimensions and specifications.

Innovation Solution

A fitting member with specific structures is used to support backlight films, allowing thermal expansion and eliminating the need for tape by engaging with lugs on the films and the exterior frame, thereby simplifying assembly and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If silicon resin tape is used to attach backlight films to the exterior frame, then the backlight films can be fixed in position, but the assembly process becomes laborious and time-consuming

Engineering Contradiction:

Improveposition stability of backlight filmVSAvoidassembly speed

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent removes the silicon resin tape from the system and replaces it with a fitting structure integrated into the exterior frame. The fitting member with groove directly engages the backlight film edge, eliminating the need for adhesive tape and its associated labor-intensive application process.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the chemical adhesion mechanism (silicon resin tape) with a mechanical engagement system. The fitting member's groove structure mechanically interlocks with the backlight film edge, providing fixation through physical constraint rather than adhesive bonding.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Strength

If silicon resin tape is used to attach backlight films, then the films can be adhered to the exterior frame, but the adhesion strength is insufficient under high-temperature and humidity conditions

Engineering Contradiction:

Improveadhesion strengthVSAvoidattachment reliability under thermal stress

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent eliminates the silicon resin tape that fails under thermal stress and replaces it with a mechanical fitting structure. This removes the weak adhesive bonding interface and substitutes it with a robust mechanical engagement that maintains strength across temperature variations.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using adhesive to bond the film to the frame, the patent inverts the approach by having the frame's fitting member mechanically interlock with the film edge. This reverses the bonding mechanism from chemical adhesion to mechanical constraint, achieving superior thermal stability.

Inventive Principle:

Principle #13The other way round (Inversion)

3Stability of the object's composition

If the edges of backlight films are permanently fixed by tape, then the films are adhered to the exterior frame, but the films cannot accommodate thermal expansion and form wavy structures

Engineering Contradiction:

Improveedge fixationVSAvoidwavy structure formation

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent creates a dynamic fixation system where the fitting member's groove provides constraint while allowing controlled movement. The backlight film can expand and contract within the groove during thermal cycling, preventing the accumulation of stress that causes wavy structures while maintaining edge positioning.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the fixation parameter from permanent rigid bonding (tape adhesion) to flexible mechanical constraint (groove engagement). This allows the fixation strength to adapt to thermal expansion forces, maintaining edge stability while accommodating dimensional changes during temperature variations.

Inventive Principle:

Principle #35Parameter changes

4Manufacturing precision

If various specifications of tape are used for different display dimensions, then the backlight films can be properly attached, but the production cost increases

Engineering Contradiction:

Improveattachment precision for different sizesVSAvoidproduction cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent designs the fitting member with a universal groove structure that can accommodate backlight films of various dimensions. The same fitting member design can be used across different display sizes, eliminating the need for multiple tape specifications and reducing manufacturing complexity and cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of adapting the adhesive tape to different film sizes, the patent inverts the approach by having the fitting member's groove accommodate various film dimensions. This reverses the customization requirement from the adhesive component to a universal mechanical structure, simplifying production.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS7309138B2Backlight module and method of assembling the same

Publication Date: 2007.12.18 INNOLUX CORP

AI summary

A backlight module and method of assembling the same. At least one fitting structure is formed on each of the top surface and side surface of an exterior frame of the backlight, and a fitting member is provided for each fitting structure. A plurality of fitting structures is formed on the fitting members to be engaged with the fitting structures of the top and side surfaces, such that the backlight films of the backlight module can be properly held between the exterior frame and the fitting members.