Flexible Display Air Layer Reduces Capacitance and Afterimages
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Solution Overview
Problem
Flexible display devices using polyimide substrates face challenges with afterimages and display quality due to capacitance issues and charge movement, particularly in low frequency bands, which affect transistor operation and image retention.
Innovation Solution
The implementation of a display device structure featuring a flexible substrate with a metal layer and an air layer formed between the substrate and the metal layer, supported by a film with convex and concave portions, reduces total capacitance and filters out noise in low frequency bands, improving afterimage amelioration and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible substrate with metal layer is used in display device, then capacitance under transistor is reduced and afterimage is ameliorated, but device structure becomes more complex
Solution Approach 1:
The space between the flexible substrate and metal layer is segmented into multiple air layers separated by insulating layers, which reduces overall capacitance while maintaining a manageable structural complexity. The air layers are created by positioning insulating layers at specific intervals, dividing the capacitive coupling into smaller segments.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the flexible substrate and metal layer. These intermediary layers serve dual purposes: they reduce capacitance by increasing the effective distance between conductive surfaces, and they maintain structural integrity without requiring direct contact between the substrate and metal layer.
2Object-affected harmful factors
If air layer is formed between flexible substrate and metal layer, then capacitance is reduced and noise in low frequency bands is filtered, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layers are formed in advance during the manufacturing process, creating predetermined air gaps before the metal layer is deposited. This preliminary action ensures that the air layers are formed with controlled thickness and positioning, reducing the need for post-manufacturing adjustments and lowering overall precision requirements.
Solution Approach 2:
The thickness and material properties of the insulating layers are carefully selected to achieve the desired capacitance reduction and noise filtering effects. By optimizing the dielectric constant and thickness parameters of the insulating layers, the design achieves effective noise filtering while maintaining reasonable manufacturing tolerances.
3Reliability
If multiple layers including barrier layer and buffer layer are added, then charge movement is prevented and display quality improves, but device complexity increases
Solution Approach 1:
The barrier layer and buffer layer are extracted as separate, specialized components with distinct functions. The barrier layer specifically addresses charge movement prevention, while the buffer layer provides additional insulation and structural support. By separating these functions into dedicated layers rather than combining them, the design achieves improved charge control without excessive complexity.
Solution Approach 2:
The insulating layers serve multiple functions simultaneously: they reduce capacitance, filter noise, prevent charge movement, and provide structural support. This multi-functionality reduces the need for additional specialized layers, thereby limiting the increase in device complexity while achieving multiple protective effects.
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 reduces capacitance under the transistor, filters out noise in low frequency bands, and prevents charge movement, resulting in improved display quality and reduced afterimages.
Implementation Method 1
reduces total capacitance and filters out noise in low frequency bands
Implementation Method 2
prevents charge movement
Data Source
AI summary
A display device includes a flexible substrate, a display element on the flexible substrate and including a thin film transistor, a metal layer disposed at a lower portion of the flexible substrate, and an air layer formed between the flexible substrate and the metal layer.