Display Panel Pad Structure for TAB-IC Peeling Prevention
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Solution Overview
Problem
In display devices, when a defect is detected in the driving integrated circuit (TAB-IC) attached to the pad of the display panel, the TAB-IC and pad are typically separated, leading to damage to the pad and rendering the display panel unusable for reuse.
Innovation Solution
A peeling prevention structure is implemented adjacent to the pad area, featuring a reverse taper slope and insulating layers to prevent damage during separation, allowing for the reuse of the display panel by minimizing peeling forces and maintaining the integrity of the pad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TAB-IC is separated from the display panel when a defect is detected, then the defective TAB-IC can be removed, but the pad may be damaged and the display panel cannot be reused
Solution Approach 1:
The peeling prevention structure serves as an intermediary element positioned between the TAB-IC and the pad. When the TAB-IC is separated, the peeling prevention structure absorbs the mechanical stress and prevents direct contact between the separating TAB-IC and the pad, thereby protecting the pad from damage while enabling TAB-IC replacement
Solution Approach 2:
The peeling prevention structure is pre-installed in the pad area before the TAB-IC is attached. This structure provides cushioning protection in advance, so that when separation is needed, the pad is already protected from potential damage during the separation process
2Ease of repair
If the TAB-IC is separated from the display panel, then the defective component can be replaced, but material waste increases due to pad damage
Solution Approach 1:
The peeling prevention structure acts as a mediator that enables TAB-IC replacement while preventing material waste. By absorbing separation forces, it allows the pad and display panel to remain intact and reusable, thus eliminating material waste associated with pad damage
3Device complexity
If no peeling prevention structure is used, then the device complexity is lower, but the pad is vulnerable to damage during TAB-IC separation
Solution Approach 1:
The peeling prevention structure is applied locally only in the pad area where protection is needed, rather than throughout the entire display panel. This localized approach provides necessary protection while minimizing additional complexity and material usage
Data Source
AI summary
A display device includes a display device including a substrate including a display area, on which a plurality of pixels is disposed, and a pad area positioned in a periphery of the display area, a first insulating layer disposed on the substrate, a pad electrode disposed on the first insulating layer in the pad area, a peeling prevention structure disposed on the first insulating layer in the pad area to be spaced apart from the pad electrode, where the peeling prevention structure includes a first side surface facing the pad electrode and a second side surface opposite to the first side surface, and a second insulating layer disposed on the pad electrode and the peeling prevention structure, where an end of the first insulating layer is in contact with the second side surface of the peeling prevention structure, and an end of the second insulating layer is aligned with a boundary of a top surface of the peeling prevention structure.