Thin Film Transistor Array Substrate Black Matrix Light Shielding
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Solution Overview
Problem
Conventional thin film transistor array substrates for liquid crystal displays suffer from poor light-shielding due to the susceptibility of semiconductor layers to external light, degrading the display effect.
Innovation Solution
Incorporating a black matrix between the substrate and the thin film transistor, with the black matrix having an area larger than the semiconductor layer, effectively blocks light emitted by the backlight source, enhancing light-shielding and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional thin film transistor structure is used without additional light-shielding layers, then the device complexity is low and manufacturing is simple, but the light-shielding performance is poor due to semiconductor layer susceptibility to external light
Solution Approach 1:
The patent divides the light-shielding function into two separate components: the black matrix layer and the reflective layer. This segmentation allows each layer to perform its specific function optimally - the black matrix absorbs light in the non-display zone while the reflective layer redirects light in the display zone, improving overall light-shielding performance without requiring a single complex structure
Solution Approach 2:
The patent introduces an intermediary reflective layer between the color filter substrate and the liquid crystal layer. This intermediary layer mediates the interaction between external light and the semiconductor layer by reflecting light away from the semiconductor layer, thereby protecting the photosensitive semiconductor material without directly contacting or modifying it
2Object-affected harmful factors
If the black matrix area is increased to improve light-shielding, then light-shielding performance improves, but the display area is reduced
Solution Approach 1:
The patent segments the light-shielding function between the black matrix (in non-display zones) and the reflective layer (in display zones). This allows the black matrix to be positioned in areas that would otherwise be non-display regions, effectively shielding light without sacrificing display area, as the reflective layer handles light management within the display zone
Solution Approach 2:
The patent addresses the area conflict by operating in different spatial dimensions: the black matrix is positioned in the non-display zone (peripheral dimension) while the reflective layer is positioned in the display zone (central dimension). This dimensional separation allows both light-shielding and display area requirements to be satisfied simultaneously without direct trade-off
3Object-affected harmful factors
If a reflective layer is added to improve light-shielding, then light-shielding performance improves, but the device complexity increases
Solution Approach 1:
The reflective layer serves multiple functions simultaneously: it reflects light away from the semiconductor layer to prevent photo-induced degradation, it enhances the overall light-shielding effectiveness when combined with the black matrix, and it can be integrated into the existing display stack without requiring fundamental structural changes. This multi-functionality justifies the added layer while providing comprehensive light management
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 implementation of a black matrix under the thin film transistor effectively blocks external light, enhancing light-shielding and thereby improving the display effect of liquid crystal displays by preventing light irradiation on the semiconductor layer.
Implementation Method 1
the black matrix is disposed between the substrate and the thin film transistor... effectively blocks light emitted by the backlight source
Data Source
AI summary
A thin film transistor array substrate, a manufacturing method thereof and a display device are provided. The array substrate includes a substrate and a plurality of pixel units arranged on the substrate, each of which includes a display zone and a non-display zone including a thin film transistor and a black matrix that are provided on the substrate, wherein the black matrix is disposed between the substrate and the thin film transistor.