Display Device Separator and Electrostatic Control for Leakage Prevention
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Solution Overview
Problem
Display devices face defects due to leakage current between pixels and changes in transistor characteristics during the manufacturing process, leading to spots on the display.
Innovation Solution
A display device design with a separator around pixels, an electrostatic element unit, and a specific structure of voltage lines and contact holes to prevent leakage current and static charge effects, including a passivation layer and insulating layers to manage static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator is introduced between adjacent pixels to prevent leakage current, then reliability is improved, but device complexity increases
Solution Approach 1:
The pixel structure is segmented by introducing a separator between adjacent pixels. The separator divides the light emitting auxiliary layer and common electrode into separate regions for each pixel, preventing electrical leakage between pixels while maintaining the overall display structure integrity.
Solution Approach 2:
The separator acts as an intermediary element positioned between adjacent pixels. It serves as a physical barrier that isolates the light emitting auxiliary layer and common electrode of neighboring pixels, preventing direct electrical contact and leakage current while allowing the display to function as a unified structure.
2Reliability
If electrostatic elements are added to prevent static charge effects, then reliability is improved, but device complexity increases
Solution Approach 1:
Electrostatic elements are incorporated into the device structure during the manufacturing process to proactively neutralize static charges before they can cause defects. The electrostatic element unit, positioned in the peripheral area, continuously manages static electricity accumulation throughout the device operation, preventing transient charging effects that would otherwise alter transistor characteristics.
Solution Approach 2:
The electrostatic element unit serves as an intermediary system that mediates between static charge accumulation and transistor operation. It provides a controlled path for static charge dissipation, preventing direct interference with the transistor channel and ensuring stable electrical characteristics during manufacturing and operation.
3Ease of manufacture
If contact holes are positioned on voltage lines in the electrostatic element unit, then ease of manufacture is improved, but harmful electrical factors increase
Solution Approach 1:
The contact holes positioned on voltage lines in the electrostatic element unit are designed to controlled electrical discharge. Rather than creating harmful discharge paths, the structure converts potential electrostatic hazards into beneficial charge dissipation channels, allowing static electricity to be safely discharged through the voltage lines to ground potential.
Solution Approach 2:
The voltage lines serve as intermediary conductive paths between the contact holes and ground potential. They mediate the electrical connection, allowing controlled charge dissipation from the electrostatic elements while preventing uncontrolled discharge that would damage the device. The insulating layer further mediates by providing electrical isolation where needed.
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 display defects by ensuring no leakage current between pixels and maintaining transistor characteristics, thus preventing spots from appearing on the display.
Implementation Method 1
an insulating layer in the contact hole. The insulating layer may contact a side surface of the passivation layer defining the contact hole and an upper surface of the first voltage line
Implementation Method 2
an electrostatic element unit positioned around the display area and including a scan driver and a plurality of electrostatic elements electrically connected to the first voltage line
Data Source
AI summary
A display device includes a display area including multiple pixels and a separator extending around the pixels, and a peripheral area located around the display area and including a scan driver and an electrostatic element part. Each pixel includes a pixel electrode, a light emitting auxiliary layer, and a common electrode. The light-emitting auxiliary layer is disconnected at the separator between neighboring pixels. The electrostatic element unit includes a first voltage line electrically connected to the scan driver, and multiple electrostatic elements electrically connected to the first voltage line. Multiple contact holes overlap the first voltage line located in the electrostatic element unit, and an insulating layer is located in the contact holes.