Display Panel Pad Layout for Insulated Test and Power Lines
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Solution Overview
Problem
Existing display devices face challenges in electrically insulating panel-lighting-test lines and power pads, which can lead to electrical interference and reduced manufacturing efficiency.
Innovation Solution
A display device design where the panel-lighting-test line and power pad are electrically insulated from each other by using a specific configuration of conductive layers, connection electrodes, and dielectric layers, ensuring they are not connected during the manufacturing process, allowing for independent voltage application during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the panel-lighting-test line and power pad are placed close to each other for compact design, then device area is reduced, but electrical insulation between them becomes compromised leading to potential electrical interference
Solution Approach 1:
The patent introduces a vertical stacking dimension by placing the panel-lighting-test line and power pad in different conductive layers (first and second conductive layers respectively). This multi-layer approach allows horizontal proximity for compact area while maintaining vertical electrical insulation through dielectric layers, effectively resolving the contradiction between area reduction and insulation reliability.
Solution Approach 2:
The patent employs dielectric layers (interlayer dielectric layer and encapsulation layer) as intermediary substances between the panel-lighting-test line and power pad. These dielectric materials provide electrical insulation while allowing the two conductive elements to be positioned close together horizontally, thus enabling compact design without compromising insulation reliability.
2Reliability
If multiple conductive layers and dielectric layers are added to ensure electrical insulation, then insulation reliability is improved, but device structure becomes more complex
Solution Approach 1:
The patent combines multiple functional layers into an integrated multi-layer structure where conductive layers, interlayer dielectric layers, and encapsulation layers are formed together in a unified manufacturing process. This merging approach ensures electrical insulation reliability while managing structural complexity through systematic layer integration rather than separate assemblies.
Solution Approach 2:
By transitioning to a multi-layer vertical structure, the patent manages complexity through organized layer stacking rather than horizontal dispersion. The systematic arrangement of conductive and dielectric layers in the vertical dimension provides clear insulation pathways while maintaining a manageable overall structure that can be manufactured using standard multi-layer fabrication processes.
3Object-affected harmful factors
If the panel-lighting-test line and power pad are electrically insulated using multiple layers, then electrical interference is reduced, but manufacturing process becomes more complex
Solution Approach 1:
The patent incorporates the dielectric layers and insulation structures during the initial formation of the conductive layers, rather than adding them as separate post-processing steps. The interlayer dielectric layer is formed between conductive layers during fabrication, and the encapsulation layer is integrated into the overall device structure, enabling electrical insulation to be established preliminarily during manufacturing rather than requiring additional complex post-manufacturing insulation steps.
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 effectively prevents electrical interference between the panel-lighting-test line and power pad, enhancing manufacturing efficiency and ensuring accurate voltage application during panel testing.
Implementation Method 1
a substrate and multiple conductive layers separated by an interlayer dielectric layer and via layer, preventing direct connection
Data Source
AI summary
A display device includes a display panel including a display area having a scan area, and having a power area on one side of the scan area, and a non-display area surrounding the display area, and having a pad portion on one side of the non-display area, the pad portion including a first pad including line pads connected to lines of the scan area, a second pad including line pads, and a power pad configured to supply an off signal to a line of the lines of the power area and connected to lines of the power area, and a panel-lighting-test line on at least one side of the power pad, and spaced apart from the power pad.


