UV Blocking Layer in Display Substrate for Component Protection
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Solution Overview
Problem
Display devices, particularly OLEDs, are vulnerable to damage from ultraviolet light exposure, which can occur during manufacturing or outdoor use, affecting components like thin film transistors and display elements.
Innovation Solution
Incorporating a first ultraviolet light blocking layer between substrate layers in the display device, composed of materials such as benzophenone compounds, benzotriazole compounds, or calcium oxide, to absorb and convert ultraviolet light into heat, preventing damage to internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device is exposed to ultraviolet light during manufacturing or outdoor use, then the thin film transistors and display elements can perform their functions, but the ultraviolet light causes damage to these components over time
Solution Approach 1:
An ultraviolet light blocking layer is introduced as an intermediary component between the substrate and the sensitive electronic components (thin film transistors and display elements). This blocking layer absorbs or reflects ultraviolet light, preventing it from reaching and damaging the underlying components, thereby resolving the contradiction between maintaining component functionality and protecting against ultraviolet damage.
Solution Approach 2:
The patent converts the harmful ultraviolet light into a beneficial effect by using materials in the blocking layer that absorb ultraviolet radiation and convert it into harmless heat energy. This transformation protects the thin film transistors and display elements from degradation while allowing the device to maintain its operational reliability.
2Device complexity
If a substrate structure without ultraviolet blocking layer is used, then the device structure remains simple, but the components are vulnerable to ultraviolet light damage
Solution Approach 1:
The substrate structure is segmented into multiple functional layers, including a dedicated ultraviolet light blocking layer positioned between the substrate and the sensitive components. This segmentation allows each layer to perform its specific function - the blocking layer protects against ultraviolet light while other layers handle electrical and structural functions, achieving component protection with minimal added complexity.
3Reliability
If multiple protective layers are added to block ultraviolet light, then component protection is improved, but the device structure becomes more complex
Solution Approach 1:
The ultraviolet light blocking layer is designed to serve multiple functions simultaneously: it blocks ultraviolet light, provides a barrier against moisture and oxygen, and maintains structural integrity. This multi-functionality reduces the need for separate protective layers, achieving comprehensive component protection without significantly increasing device complexity.
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
Effectively blocks ultraviolet light, reducing the risk of damage to thin film transistors, capacitors, and display elements, thereby enhancing the durability and reliability of the display device.
Implementation Method 1
Incorporating a first ultraviolet light blocking layer between substrate layers in the display device, composed of materials such as benzophenone compounds, benzotriazole compounds, or calcium oxide, to absorb and convert ultraviolet light into heat
Data Source
AI summary
A display device includes a substrate, a thin film transistor disposed on the substrate, and a display element electrically connected to the thin film transistor. The substrate includes a first substrate layer, a second substrate layer disposed on the first substrate layer, a first barrier layer disposed between the first substrate layer and the second substrate layer, and a first ultraviolet light blocking layer disposed between the first substrate layer and the second substrate layer.