Colored Insulating Layer Shields Active Layer in Array Substrate
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Solution Overview
Problem
Oxide semiconductor thin film transistors in array substrates are prone to degradation due to sensitivity to ambient light, particularly in top gate structures where the active layer is exposed to external light sources, leading to performance degradation and increased fabrication complexity and cost.
Innovation Solution
A colored region is integrated into the first insulating layer of the array substrate, capable of absorbing light in the 200-500 nm wavelength range, using materials like oxide, nitride, or oxynitride doped with metal ions, positioned to cover the active layer and protect it from external light, while maintaining transparency for effective display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal shielding layer is arranged between the substrate and the active layer to shield light, then the active layer is protected from light irradiation, but the fabrication process becomes more complex and costly
Solution Approach 1:
The patent combines the shielding function with the existing first insulating layer by forming a colored insulating layer that integrates both insulation and light shielding properties. This merging eliminates the need for a separate metal shielding layer, thereby protecting the active layer from light irradiation while avoiding the complexity and cost of additional fabrication steps
Solution Approach 2:
The patent changes the optical parameters of the first insulating layer by doping it with metal ions to create a colored insulating layer with specific light absorption characteristics. This parameter change enables the insulating layer to absorb short-wavelength light (200-500 nm) while maintaining its electrical insulation function, thus providing shielding without adding structural complexity
2Length of moving object
If the active layer is positioned close to the substrate in a top gate structure to reduce device thickness, then the device becomes more compact, but the active layer becomes more exposed to external light sources causing performance degradation
Solution Approach 1:
The patent introduces a colored insulating layer as an intermediary between the substrate and the active layer. This intermediary layer absorbs harmful short-wavelength light before it reaches the active layer, thereby protecting the light-sensitive active layer while maintaining the compact top gate structure and close positioning of components
Solution Approach 2:
The patent converts the harmful effect of light absorption into a beneficial protective function. By doping the insulating layer with metal ions to create light-absorbing colored regions, the layer that would normally be transparent becomes a protective shield, turning the potential harm of light exposure into a benefit by using the insulating layer itself as the shielding mechanism
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 shields the active layer from short-wavelength light, stabilizing device performance, prolonging service life, and simplifying the fabrication process while maintaining the display's light-emitting capabilities and aperture ratio.
Implementation Method 1
a colored region 110 which is capable of absorbing light in a wavelength range of 200-500 nm
Data Source
AI summary
An array substrate, a method for fabricating the same and a display device are disclosed. The array substrate includes a substrate, and a first insulating layer and a thin film transistor which are arranged on the substrate in this order. The first insulating layer includes a colored region which is configured to absorb light. An orthographic projection of the colored region on the substrate at least covers an orthographic projection of the active layer of the thin film transistor on the substrate. By arranging the colored region of the first insulating layer, the light with a short wavelength from an external light source is absorbed. Thus, a channel of the active layer is protected, stable performance of a device is realized, and a service life of the device is prolonged.