Dummy Pixel Electrodes for Scan Drive Circuit ESD Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active-matrix display panels are susceptible to electrostatic discharge (ESD) during manufacturing, particularly affecting the scan drive circuit due to its electrical connection to the scan lines.
Innovation Solution
Incorporating dummy pixel electrodes between the effective pixel electrodes and the scan drive circuit, which are electrically connected to the scan lines, thereby isolating the scan drive circuit from static electricity until it is connected to the scan lines during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scan drive circuit is electrically connected to the scan lines during manufacturing, then the display device can function properly, but the scan drive circuit becomes susceptible to electrostatic discharge (ESD)
Solution Approach 1:
The patent introduces dummy pixel electrodes as intermediary components between the scan drive circuit and the scan lines. These dummy electrodes serve as a buffer that can absorb electrostatic discharge before it reaches the sensitive scan drive circuit, while still allowing the scan lines to be electrically connected for normal operation. This mediator structure protects the circuit from ESD during manufacturing and testing phases.
Solution Approach 2:
The dummy pixel electrodes are pre-configured and electrically connected to the scan lines before the actual pixel electrodes are fully assembled. This preliminary setup creates a protective pathway that is in place during manufacturing processes, allowing the scan drive circuit to be connected to scan lines while already having ESD protection in position.
2Reliability
If dummy pixel electrodes are added between effective pixel electrodes and scan drive circuit, then the scan drive circuit is protected from static electricity, but the device structure becomes more complex
Solution Approach 1:
The dummy pixel electrodes perform multiple functions: they serve as ESD protection elements, maintain the regular pixel matrix structure for manufacturing consistency, and can potentially serve as additional display elements or sensors. This multi-functionality reduces the need for separate protection circuits, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The dummy pixel electrodes are designed to have the same structure, material composition, and electrical characteristics as the effective pixel electrodes. This homogeneity allows them to be manufactured using the same processes and integrated into the existing pixel matrix without requiring additional complex manufacturing steps or different material handling procedures.
Data Source
AI summary
A display device includes: a plurality of pixel electrodes; a plurality of pixel circuits below the plurality of pixel electrodes; some scan lines, each of the scan lines being connected to a corresponding one group of the plurality of pixel circuits; and a scan drive circuit configured to selectively send scanning signals to the scan lines. The plurality of pixel electrodes include effective pixel electrodes corresponding to respective pixels constituting a displayed image, and dummy pixel electrodes between the effective pixel electrodes and the scan drive circuit and corresponding to none of the respective pixels. Each of the effective pixel electrodes is connected to a corresponding one of the plurality of pixel circuits. Each of the scan lines is electrically connected to the scan drive circuit through a corresponding at least one of the dummy pixel electrodes.