Doped Polymer Substrate for Display Brightness Stability
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Solution Overview
Problem
Display apparatuses face reduced image quality due to varying light brightness from display devices even when the same electrical signal is applied, caused by external influences affecting the thin film transistor's electrical characteristics.
Innovation Solution
A display apparatus with a substrate doped with 1×10^20 to 1×10^23 dopants per cm^3, featuring a polysilicon layer or polymer resin layers with a barrier and buffer layer structure, including silicon nitride and silicon oxide, to stabilize electrical signals and prevent dipole moment formation, ensuring consistent brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional substrate without doping is used, then the manufacturing process is simple, but the thin film transistor's electrical characteristics are affected by external influences causing varying brightness
Solution Approach 1:
The substrate is doped with dopants in specific regions (channel region, source region, drain region) rather than uniformly throughout. This local doping approach modifies the electrical characteristics only where needed to stabilize the thin film transistor operation, while keeping the rest of the substrate structure simple and maintaining ease of manufacturing.
Solution Approach 2:
The substrate's electrical parameters are changed by introducing dopants with specific concentrations (1×10^20 to 1×10^23 dopants per cm³). This parameter modification stabilizes the electrical characteristics of the thin film transistor by controlling charge carrier concentration, thereby reducing sensitivity to external influences while maintaining a relatively simple substrate structure.
2Reliability
If the substrate is doped with high concentration of dopants, then the electrical characteristics are more stable, but the manufacturing precision and control become more difficult
Solution Approach 1:
A specific range of dopant concentrations (1×10^20 to 1×10^23 dopants per cm³) is established to optimize the balance between electrical stability and manufacturing controllability. This parameter specification ensures sufficient electrical characteristic stability while remaining within achievable manufacturing precision limits for conventional doping processes.
Solution Approach 2:
Rather than attempting to achieve extremely precise dopant concentration control, the invention specifies a reasonable range that provides sufficient electrical stability. This partial precision approach acknowledges manufacturing variations while still achieving the desired reliability improvement, avoiding the need for overly complex manufacturing control systems.
3Reliability
If no barrier and buffer layers are used, then the device structure is simpler, but dipole moments form causing brightness variation
Solution Approach 1:
Barrier layers and buffer layers are introduced as intermediary structures between the doped substrate and the thin film transistor. These intermediate layers prevent direct interaction that would cause dipole moment formation, thereby stabilizing electrical characteristics and ensuring brightness consistency while adding only moderate structural complexity.
Solution Approach 2:
The device structure employs composite material layers including the polymer resin substrate, doped regions, barrier layers, and buffer layers. This composite structure combines materials with different properties to simultaneously achieve electrical stability, dipole moment prevention, and manageable structural 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
The solution effectively shields electrical signals and prevents dipole moment alignment, thereby maintaining consistent brightness and improving image quality by stabilizing the thin film transistor's operation, reducing image quality degradation.
Implementation Method 1
A portion of the substrate including an upper surface of the substrate is doped with 1×10^20 to 1×10^23 dopants per 1 cm³
Implementation Method 2
A barrier layer is over the upper surface of the substrate. A buffer layer is over the barrier layer
Data Source
AI summary
A display apparatus includes a substrate including a polymer resin. A portion of the substrate including an upper surface of the substrate is doped with 1×1020 to 1×1023 dopants per 1 cm3. A barrier layer is positioned above the upper surface of the substrate. A buffer layer is positioned above the barrier layer. A thin film transistor is positioned above the buffer layer. A display device is electrically connected to the thin film transistor.