Anisotropic Conductive Film Mounting for Display IC Durability
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Solution Overview
Problem
Conventional display devices with liquid crystal display panels face durability issues due to the driving integrated circuit chip separating from the panel under external impact, leading to increased failure rates.
Innovation Solution
A display device design featuring a mounting arrangement with anisotropic conductive film (ACF) that securely attaches the driving integrated circuit chip to the display panel, utilizing an adhesive layer and conductive balls to enhance the adhesive force between the chip and the substrate, thereby preventing separation during mechanical shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving integrated circuit chip is mounted directly onto the display panel using conventional methods, then the device achieves miniaturization and reduced power consumption, but the chip may separate from the panel due to external impact, causing device failure
Solution Approach 1:
The patent uses anisotropic conductive film (ACF) as a composite material that combines adhesive properties with electrical conductivity. The ACF consists of conductive particles embedded in an adhesive matrix, creating a material that simultaneously provides strong bonding between the IC chip and display panel while maintaining electrical connection, thereby resolving the contradiction between durability and adhesive strength
Solution Approach 2:
The invention changes the mounting parameters by introducing ACF with specific adhesive strength characteristics that exceed the strength of the protection layer bonding. This parameter change ensures that under external impact, the protection layer detaches before the ACF bond fails, preventing chip separation and improving reliability
2Stability of the object's composition
If the protection layer is made to strongly adhere to the first display substrate, then the mounting structure is stable, but the driving integrated circuit chip may still separate under external impact
Solution Approach 1:
The patent applies beforehand cushioning by designing the ACF adhesive strength to be higher than the protection layer adhesion strength. This creates a sacrificial protection layer that can detach under impact to absorb shock, while the ACF maintains the critical IC chip connection, preventing device failure despite the protection layer's strong initial adhesion
3Strength
If the anisotropic conductive film is used to attach the driving integrated circuit chip, then the adhesive force is strengthened, but the manufacturing process becomes more complex
Solution Approach 1:
The anisotropic conductive film serves multiple functions simultaneously: it provides strong adhesive bonding between the IC chip and display panel, establishes electrical conductivity for signal transmission, and offers mechanical cushioning against impact. This multi-functionality reduces the need for separate adhesive and conductive layers, simplifying the overall mounting structure despite the enhanced adhesive performance
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 reduces the failure rate and improves the durability of the display device by ensuring a strong and stable attachment of the driving integrated circuit chip, even under external impacts that would otherwise detach the chip from the panel.
Implementation Method 1
an anisotropic conductive film (ACF) provided in the adhesive hole and in the contact holes; and a driving integrated circuit chip attached to the anisotropic conductive film (ACF) in the adhesive hole
Data Source
AI summary
A display device in which a driving chip is attached to a display panel by using an anisotropic conductive film to from a strong adhesive bond between the body of the driving chip and the display panel and to electrically connect contact terminals on the driving chip with contact pads on the display panel.