Polyimide Substrate for Display Devices Reducing Electron Charging
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Solution Overview
Problem
Display devices face challenges in achieving improved dielectric constants and transmittance, leading to issues with afterimage persistence and overall display quality, particularly due to charging phenomena and interfacial polarization at the substrate level.
Innovation Solution
The use of a polyimide resin with a bent molecular structure and fluorine atoms in the second substrate, which has a dielectric constant of 3.5 or less, reduces electron charging and suppresses interfacial polarization, enhancing light transmittance and reducing the need for additional conductive members or mask processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional substrates are used in display devices, then structural support is provided, but electron charging and interfacial polarization occur leading to poor afterimage performance
Solution Approach 1:
The patent changes the dielectric constant parameter of the substrate by selecting specific materials (first substrate with dielectric constant of 3.0 or less, second substrate with dielectric constant of 3.5 or less) to reduce electron charging and interfacial polarization, thereby improving afterimage performance
Solution Approach 2:
The patent uses a composite substrate structure combining a first substrate and a second substrate with different dielectric constant properties, where the first substrate has lower dielectric constant (3.0 or less) and the second substrate has slightly higher but still low dielectric constant (3.5 or less), creating a composite system that optimizes both mechanical support and electrical performance
2Reliability
If additional conductive members or mask processes are added to reduce electron charging, then afterimage performance improves, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent extracts and eliminates the need for additional conductive members and mask processes by addressing the root cause (substrate dielectric constant) directly, thereby simplifying the device structure and manufacturing process while maintaining improved afterimage performance
Solution Approach 2:
The substrate materials themselves provide the functionality to reduce electron charging and interfacial polarization through their inherent low dielectric constant properties, eliminating the need for additional functional layers or processing steps
3Illumination intensity
If substrate material properties are optimized for low dielectric constant, then transmittance improves, but mechanical strength may be compromised
Solution Approach 1:
The patent employs a composite substrate structure where the first substrate (with lower dielectric constant) and second substrate (with slightly higher dielectric constant) work together, allowing optimization of optical properties while maintaining mechanical strength through the combined structural integrity of both substrates
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 approach improves the moment and mid to long-term afterimage performance and transmittance of display devices, reducing electron charging and interfacial polarization, thereby enhancing display quality without requiring additional processing steps.
Implementation Method 1
charging phenomena and interfacial polarization at the substrate level
Implementation Method 2
dielectric constant of the second substrate is less than a dielectric constant of the first substrate
Implementation Method 3
transmittance of 85% or greater for light having a wavelength of 450 nanometer (nm)
Data Source
AI summary
A display device including a first substrate and a second substrate. A first barrier layer is on the first substrate and the second substrate is on the first barrier layer. A second barrier layer is on the second substrate and a buffer layer is on the second barrier layer. At least one transistor is on the buffer layer and an organic light-emitting diode is on the at least one transistor. The second substrate comprises a polyimide resin and a dielectric constant of the second substrate is smaller than a dielectric constant of the first substrate.