Array Substrate Dummy Pixel Electrostatic Discharge Pad Design
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Solution Overview
Problem
Existing flat-panel display (FPD) devices face challenges in minimizing the width of the peripheral non-display area while effectively preventing electrostatic destruction, which affects manufacturing yield and reliability, especially when using low-temperature polysilicon films.
Innovation Solution
The array substrate design incorporates a unique arrangement of dummy pixels with specific connection wiring patterns, including first and second connection wirings that extend from the switching element, with the first connection wiring having a pad at its distal end in the peripheral non-viewing area, allowing for efficient electrostatic discharge without electrical connection to pixel electrodes, thereby minimizing the dummy pixel area width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixels are arranged in the peripheral non-viewing area to prevent electrostatic destruction, then reliability is improved, but the width of the peripheral non-display area increases
Solution Approach 1:
The patent extracts the essential electrostatic protection function from the complete dummy pixel structure and implements it through simplified connection wirings with pads that extend from switching elements. These simplified structures provide electrostatic discharge capability without requiring full dummy pixel configurations, thereby reducing the width of the peripheral non-viewing area while maintaining reliability
Solution Approach 2:
The patent applies electrostatic protection locally by providing connection wirings with pads at specific positions where electrostatic discharge is needed, rather than using uniform dummy pixels across the entire peripheral area. The pads are strategically positioned to provide discharge paths while minimizing the overall area occupied by protective structures
2Length of moving object
If the width of peripheral non-display area is minimized for weight and size reduction, then device dimensions are reduced, but protection against electrostatic destruction becomes insufficient
Solution Approach 1:
The patent changes the structural parameters of the connection wirings by extending them beyond typical pixel boundaries and adding pads at their distal ends. This parameter modification allows the wirings to serve dual purposes: maintaining pixel functionality and providing electrostatic discharge paths, thereby achieving protection with minimal peripheral width
Solution Approach 2:
The connection wirings are designed to perform multiple functions: they serve as electrical connections for pixel operation and simultaneously function as electrostatic discharge paths through their extended structure with pads. This multi-functionality eliminates the need for separate dedicated electrostatic protection structures, minimizing the peripheral area required
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 design effectively reduces the width of the dummy pixel area while maintaining high manufacturing yield and reliability by efficiently dissipating electrostatic charges, thus addressing the challenge of electrostatic destruction in FPD devices with low-temperature polysilicon films.
Implementation Method 1
the first connection wiring extends in a direction away from the scanning line at a position distanced from the switching element, and has a pad having a width larger than other part of the first connection wiring at its distal end
Data Source
AI summary
An array substrate for an FPD device, wherein, in each of the display pixel dots in the display area, the first connection wiring is connected to the pixel electrode via a contact hole while the second connection wiring is connected to the signal line via a contact hole; in each of the dummy pixel dots, the first connection wiring is not electrically connected to any of the pixel electrodes; in the peripheral non-viewing area extending in a direction along the signal line, the first connection wiring extends in a direction away from the scanning line at a position distanced from the switching element, and has a pad having a width larger than other part of the first connection wiring at its distal end.