Display Electrode Pad Layout for Reflection-Free Inspection
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Solution Overview
Problem
In display devices with a metal layer formed in a frame-like shape, it is difficult to confirm the position of an electrode pad for analysis or inspection due to reflection from the metal layer.
Innovation Solution
A display device configuration that includes a display region and a frame region with a flattening film, where the frame region has a metal layer electrically connected to the second electrode and featuring openings, and an electrode pad with an island shape that overlaps the openings via an insulating film, allowing for easy position confirmation of the electrode pad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is formed in a frame-like shape in the frame region, then electrical connection and structural support are improved, but the position confirmation of the electrode pad becomes difficult due to reflection from the metal layer
Solution Approach 1:
The metal layer is divided into multiple separate metal regions corresponding to different electrode pads, with insulating films between them. This segmentation allows each electrode pad position to be visually distinguished through its corresponding metal region while maintaining electrical connection functionality.
Solution Approach 2:
Insulating films are introduced as intermediary layers between adjacent metal regions. These insulating films prevent electrical shorting while allowing optical transmission, enabling visual confirmation of electrode pad positions through the metal layer structure.
2Strength
If the metal layer is kept intact for structural support, then device strength is improved, but the electrode pad position cannot be confirmed without removing the metal layer
Solution Approach 1:
The metal layer structure is designed to create visual contrast through reflection and transmission properties. The metal regions and insulating films form distinguishable patterns that allow easy visual identification of electrode pad positions without altering the metal layer's structural integrity.
Solution Approach 2:
The inspection capability is added in the optical dimension by designing the metal layer and insulating film structure to be visually distinguishable. This allows simultaneous achievement of structural strength (metal layer intact) and inspection ease (visual position confirmation) by utilizing different physical dimensions.
3Difficulty of detecting and measuring
If openings are formed in the metal layer for position confirmation, then electrode pad visibility is improved, but the metal layer structure becomes more complex
Solution Approach 1:
Instead of forming openings in an continuous metal layer, the metal layer is segmented into discrete metal regions separated by insulating films. This approach achieves visibility of electrode pad positions through the insulating film gaps while maintaining a relatively simple overall structure.
Solution Approach 2:
The metal layer structure is designed to visually replicate or correspond to the underlying electrode pad arrangement. Each metal region is positioned to align with its corresponding electrode pad, allowing indirect visualization of pad positions through the metal layer pattern without requiring physical openings.
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
This configuration enables easy position confirmation of the electrode pad without the need to remove the metal layer, facilitating analysis or inspection of the display device.
Implementation Method 1
it is difficult to confirm the position of the electrode pad PADR provided below due to the reflection of the metal layer CDL
Data Source
AI summary
In a display device, the metal layer includes a plurality of openings, and electrode pads having an island shape overlap one or more of the plurality of openings via an insulating film including at least a flattening film.