Thin-Film Transistor Display Layout for Selective Hydrogen Control
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Solution Overview
Problem
Display devices face challenges in meeting the required driving characteristics for circuit elements, particularly in controlling driving timing and current supply to light emitting elements, due to difficulties in processing and re-hydrogenation effects during heat treatment.
Innovation Solution
Incorporating a hydrogen adsorption layer on the capacitor electrode of driving transistors but not on switching transistors, which allows for improved S factor control and prevents re-hydrogenation, thereby simplifying the process and meeting the necessary characteristics for each transistor type without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrogen adsorption layer is added to control transistor characteristics, then driving characteristics of transistors are improved, but device structure and process complexity increase
Solution Approach 1:
The patent applies local quality by selectively forming hydrogen adsorption layers only on capacitor electrodes associated with driving transistors, not on all capacitor electrodes or all transistor regions. This localized approach improves driving characteristics where needed while avoiding unnecessary complexity in regions where it is not required, such as switching transistor regions.
Solution Approach 2:
The patent segments the capacitor electrode structure by forming distinct hydrogen adsorption layers only on specific capacitor electrodes (those associated with driving transistors) while leaving other capacitor electrodes without such layers. This segmentation allows differential control of transistor characteristics based on functional requirements.
2Ease of manufacture
If uniform processing is applied to all transistors, then manufacturing simplicity is maintained, but different driving characteristics required for different circuit elements cannot be met
Solution Approach 1:
The patent implements local quality by applying hydrogen adsorption layer formation selectively to specific regions (driving transistor capacitor electrodes) while using uniform processing methods for other regions. This allows different functional characteristics to be achieved through localized material properties rather than complex multi-step processing variations.
Solution Approach 2:
The hydrogen adsorption layer acts as an intermediary that modifies the electrical characteristics of driving transistors without requiring changes to the fundamental transistor structure or processing steps. This intermediary layer enables precise control of driving characteristics while maintaining overall process simplicity.
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 enhances the driving characteristics of both driving and switching transistors, ensuring effective driving current generation and timing control while minimizing process complexity.
Implementation Method 1
a capacitor electrode including a hydrogen adsorption layer disposed between at least some first thin film transistors among the plurality of first thin film transistors and the insulation layer and disposed on at least one of upper and lower surfaces of the capacitor electrode
Data Source
AI summary
A display device can include multiple layers, and a capacitor on the multiple layers. The capacitor can include one capacitor electrode and the other capacitor electrode, in which the one capacitor electrode is on a layer where a first gate electrode of a first thin film transistor is disposed on, and an electrode disposed on a layer where the other capacitor electrode is disposed on and made of same material with the other capacitor electrode overlaps a second thin film transistor. The display device can further include a first planarization layer and a second planarization layer on the first thin film transistor and the second thin film transistor, and a source electrode of the first thin film transistor between the first and second planarization layers.