Pad Electrode Groove Design for Display Seam Reduction
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Solution Overview
Problem
Display devices with large non-display areas between panels suffer from image breakoff and luminance deterioration due to seam areas, which are visually noticeable and affect image quality.
Innovation Solution
A display device design featuring a pad electrode with a second groove at its lower surface and a connection ball for stable electrical connection to a chip on film, using atmospheric pressure plasma to form grooves, and a back surface bonding structure to reduce seam areas and improve luminance consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection balls are placed on the pad electrode surface for electrical connection, then electrical connection between pad electrode and chip on film is achieved, but short circuits may occur due to unstable positioning
Solution Approach 1:
The groove acts as an intermediary structure between the connection ball and pad electrode surface. It provides a dedicated receptacle that mediates the connection process, ensuring proper positioning and preventing direct contact issues that could lead to short circuits.
Solution Approach 2:
The groove is pre-formed on the pad electrode surface before connection ball placement. This preliminary structural preparation ensures that when connection balls are applied, they automatically settle into the correct position, preventing misalignment and short circuit risks.
2Ease of manufacture
If large non-display areas are used between panels, then panel assembly and manufacturing are simplified, but image breakoff and luminance deterioration occur due to noticeable seam areas
Solution Approach 1:
The invention changes the physical parameters of the groove structure (depth, width, shape) to optimize both manufacturing ease and visual appearance. By adjusting these parameters, the seam area becomes less noticeable while maintaining manufacturing simplicity.
Solution Approach 2:
The groove structure introduces local quality variations at the panel boundary regions. Different areas of the panel interface have different structural characteristics (groove vs. flat surface), which helps mask seam visibility while maintaining overall manufacturing simplicity.
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
Prevents short circuits and enhances image continuity across panel boundaries, reducing seam areas and improving luminance and color consistency, thus minimizing visual disruptions in multi-screen displays.
Implementation Method 1
The forming of the first groove and the forming of the second groove may include using an atmospheric pressure plasma process to form the first and second grooves
Data Source
AI summary
A display device includes a first base layer including a first opening; a first barrier layer located on a surface of the first base layer, and including a second opening; and a pad electrode located on the first barrier layer and overlapping the second opening in a plan view. At least one first groove is formed at a surface of the first barrier layer, a second groove is formed at a surface of the pad electrode, and the first opening exposes the at least one first groove and the second groove.