Conductive Adhesive Layer Vertical Distance for Display Driver Moisture Protection
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Solution Overview
Problem
The reliability of display devices is compromised due to the erosion of pad electrodes by moisture and oxygen, which affects the adhesive function of the conductive adhesive layer used to attach the driver to the pad area.
Innovation Solution
A display device design that incorporates a conductive adhesive layer with a specific vertical distance range between the driver and the adhesive layer, ranging from 0.2 mm to 4 mm for the shorter side and 0.1 mm to 1 mm for the longer side, to prevent moisture and oxygen penetration and enhance the moisture-proofing properties, thereby improving the attachment and reliability of the driver to the pad electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conductive adhesive layer is coated only on the pad area corresponding to the size of the driver, then the adhesive function is achieved, but the pad electrodes are easily eroded by moisture and oxygen, deteriorating reliability
Solution Approach 1:
The conductive adhesive layer is extended beyond the horizontal plane to include vertical side surfaces of the pad area. This dimensional extension creates a protective barrier that prevents moisture and oxygen from reaching the pad electrodes at the edges, while still maintaining the adhesive function on the top surface.
Solution Approach 2:
The conductive adhesive layer forms a thin film structure that covers not only the top surface but also wraps around the side surfaces of the pad area. This thin film acts as a protective shell that shields the pad electrodes from environmental factors like moisture and oxygen penetration.
2Reliability
If the conductive adhesive layer is extended beyond the driver size, then moisture and oxygen penetration is prevented, but the adhesive function may be compromised
Solution Approach 1:
The conductive adhesive layer has different coverage areas for different regions: it covers the entire top surface of the pad area for adhesion, and extends down the vertical side surfaces for protection. This localized differentiation ensures that each region serves its primary function - the top surface for bonding and the sides for moisture barrier protection.
Data Source
AI summary
A display device is disclosed. The display device includes a substrate, a display area on the substrate, the display area including a plurality of subpixels, a pad area on the substrate, the pad area including a pad electrode, a conductive adhesive layer on the pad electrode, and a driver on the conductive adhesive layer, the driver being attached to the pad electrode using the conductive adhesive layer. One surface of the conductive adhesive layer includes one surface of the driver. A vertical distance ranging from a shorter side of one surface of the driver to a shorter side of one surface of the conductive adhesive layer lies substantially in a range between 0.2 mm and 4 mm.