OLED Display Light Blocking and Transistor Integration
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Solution Overview
Problem
Existing OLED displays face challenges in simultaneously achieving optimal performance for switching and driving thin film transistors, leading to issues like cross-talk and reduced light emission, while also requiring additional manufacturing processes and polarizers to maintain contrast ratio.
Innovation Solution
The OLED display incorporates a substrate with a gate line, data line, and driving voltage line, featuring a light blocking member and both amorphous and crystalline semiconductors for the transistors, allowing for improved contrast ratio without increasing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching thin film transistor and the driving thin film transistor are independently manufactured to satisfy different required characteristics, then the performance of each transistor is optimized, but the number of manufacturing processes and the number of masks significantly increase
Solution Approach 1:
The patent merges the manufacturing processes for switching and driving thin film transistors into a single integrated process. By forming both transistor types using the same sequence of deposition and patterning steps with shared mask structures, the patent achieves simultaneous optimization of both transistor performances while avoiding the need for separate independent manufacturing processes, thus resolving the contradiction between performance optimization and manufacturing complexity
Solution Approach 2:
The patent employs universal mask structures and process parameters that serve dual functions for both switching and driving thin film transistor fabrication. The same mask patterns and deposition conditions are used to define both transistor types, allowing a single manufacturing process to universally produce both transistor types with their respective optimized characteristics, thereby reducing the overall number of manufacturing steps
2Object-generated harmful factors
If the switching thin film transistor has high on/off current ratio, then cross-talk is reduced, but the data voltage transferred to the driving thin film transistor is reduced
Solution Approach 1:
The patent applies local quality by optimizing the switching thin film transistor's channel width and length ratios specifically in regions where cross-talk suppression is critical, while maintaining adequate voltage transfer capability through localized structural adjustments. This allows high on/off current ratio for cross-talk reduction in specific areas without compromising the data voltage transfer to the driving transistor
3Reliability
If the driving thin film transistor has high charge carrier mobility and stability, then sufficient and steady current is flowed to the organic light emitting device, but the amount of light emitted is reduced if the mobility is lower
Solution Approach 1:
The patent optimizes the driving thin film transistor's channel width, length, and semiconductor layer thickness parameters to achieve the optimal balance between charge carrier mobility and light emission. By carefully adjusting these physical parameters, the patent ensures sufficient and steady current flow to the organic light emitting device while maintaining adequate light emission intensity, resolving the contradiction between current stability and illumination
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 enhances the OLED display's contrast ratio and reduces manufacturing complexity by integrating light blocking members and different semiconductor types, addressing cross-talk and light emission issues while maintaining performance.
Implementation Method 1
a light blocking member formed under at least one of the gate line, the data line, and the driving voltage line
Implementation Method 2
The injected electrons and holes are coupled at the light emitting layer, and excitons are thereby formed. The excitons emit light while discharging energy.
Data Source
AI summary
An organic light emitting diode (“OLED”) display includes a substrate, a gate line, a data line, a driving voltage line, a light blocking member, a switching thin film transistor (“TFT”), a driving TFT, and an OLED, wherein the driving voltage line includes a portion parallel to at least one of the gate line and the data line, the light blocking member is formed under at least one of the gate line, the data line, and the driving voltage line, the switching TFT is connected to the gate line and the data line and includes an amorphous semiconductor, the driving TFT is connected to the switching TFT and includes a polycrystalline semiconductor, and the OLED is connected to the driving TFT.