Segmented Light Shielding Films for Static Electricity Confinement
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Solution Overview
Problem
The generation of static electricity during the scribing process in display devices, particularly in thin film transistors with oxide active layers, leads to degradation of electric characteristics and reliability issues due to the penetration of static electricity through light shielding layers.
Innovation Solution
The implementation of a display device design featuring a first light shielding film in the display area and a second light shielding film in the non-display area, spaced apart from each other, to prevent static electricity from transferring to the display area during the scribing process, with the second light shielding film being positioned at the edge of the substrate to confine static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a light shielding layer is formed on the substrate to prevent light from entering the active layer, then the stability of the oxide active layer is improved, but static electricity generated during the scribing process penetrates through the light shielding layer and degrades the electric characteristics of the thin film transistor
Solution Approach 1:
The light shielding layer is divided into a first light shielding layer in the display area and a second light shielding layer in the non-display area, with a predetermined distance between them. This segmentation prevents static electricity generated during scribing from penetrating through the continuous light shielding layer and reaching the active layer, while still maintaining light shielding effectiveness.
Solution Approach 2:
The light shielding layer has different configurations in different areas: the first light shielding layer in the display area provides light shielding for the active layer, while the second light shielding layer in the non-display area is positioned to intercept static electricity before it reaches the display area, creating localized functional zones with different priorities.
2Object-affected harmful factors
If the light shielding layer is made continuous across the substrate to maximize light blocking effectiveness, then light shielding performance is improved, but static electricity can travel along the light shielding layer and cause electrical breakdown in the thin film transistor
Solution Approach 1:
The continuous light shielding layer is segmented into two separate layers with a gap, breaking the conductive path for static electricity while maintaining light shielding functionality in both the display and non-display areas.
Solution Approach 2:
The gap between the first and second light shielding layers acts as an intermediary barrier that interrupts the conduction path for static electricity, preventing it from traveling from the non-display area to the display area while allowing both layers to maintain their light shielding functions.
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 the transfer of static electricity to the display area, thereby enhancing the reliability and durability of thin film transistors by maintaining stable electric characteristics.
Implementation Method 1
a light shielding layer LS is disposed on the substrate 10... The light shielding layer LS prevents the light from entering an active layer to be later formed
Implementation Method 2
the first light shielding film and the second light shielding film are spaced apart from each other... to prevent static electricity from transferring to the display area during the scribing process
Data Source
AI summary
Discussed is a display device, that may include a substrate divided into a display area and a non-display area except the display area, a first light shielding film formed in the display area, a second light shielding film formed in the non-display area, and oxide thin film transistors and organic light emitting diodes, which are formed on the first light shielding film, wherein the first light shielding film and the second light shielding film are spaced apart from each other.