UV-Absorbing First Electrode for TFT Protection in PLED Displays
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Solution Overview
Problem
The display performance of PLED display devices is degraded and can fail due to ultraviolet (UV) irradiation affecting the electrical properties of metal oxide-based active layers in thin-film transistors (TFTs) during cleaning and modification processes.
Innovation Solution
An array substrate is designed with a first electrode that is electrically connected to the drain electrode of a TFT and covers areas of the active layer not overlapped with the source and drain electrodes, capable of absorbing UV light, thereby reducing the impact of UV irradiation on the TFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If UV light is used to clean and modify the array substrate before EML formation, then the cleaning and modification effect is improved, but the electrical properties of the metal oxide-based active layer are degraded and TFT switching performance is reduced
Solution Approach 1:
The patent introduces an intermediary layer (pixel electrode or additional protective layer) between the UV light source and the TFT active layer. This intermediary absorbs or blocks UV radiation while allowing the cleaning and modification process to proceed, thereby protecting the TFT from UV-induced degradation while maintaining substrate cleanliness
Solution Approach 2:
The patent converts the harmful UV radiation into a beneficial protective mechanism by utilizing materials with high UV absorption coefficients. The pixel electrode or protective layer, designed to absorb UV light, transforms what would be a harmful effect into a protective function that shields the TFT while still permitting necessary substrate treatment
2Manufacturing precision
If the array substrate is cleaned and modified with UV light, then the surface quality is improved, but the stability of the metal oxide active layer is degraded
Solution Approach 1:
An intermediary protective layer is introduced that allows UV light to pass through for substrate cleaning and surface modification while blocking the UV radiation from reaching and degrading the metal oxide active layer, thus maintaining both surface quality and layer stability
Solution Approach 2:
The patent applies different material properties to different regions or layers: the pixel electrode or protective layer is designed with high UV absorption characteristics, while the TFT active layer maintains its original composition. This local differentiation allows UV treatment of the substrate without compromising the active layer stability
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
The solution effectively protects TFTs from UV degradation, maintaining the display performance and reducing the risk of device failure by absorbing most UV light, thus ensuring stable electrical properties and improved reliability of the display device.
Implementation Method 1
the first electrode is capable of absorbing UV light
Data Source
AI summary
An array substrate, a manufacturing method thereof and a display device are disclosed. The array substrate includes a substrate (10) and first thin-film transistors (TFTs) (21) and first electrodes (40) formed on the substrate (10). The first TFT (21) includes a gate electrode (200), an active layer (202), a source electrode (205) and a drain electrode (204). The first electrode (40) is electrically connected with the drain electrode (204) of the first TFT (21), at least covers an area of the active layer (202) of the first TFT, not overlapped with the source electrode (205) and the drain electrode (204), and can absorb ultraviolet (UV) light. The array substrate can solve the problem of reducing the display performance of the display device as the performances degrade and even fail due to UV irradiation of the TFTs.