Display Panel Transistor Layout With Dummy Electrode for Leakage Suppression
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Solution Overview
Problem
High pixels per inch (PPI) display panels face challenges in suppressing electricity leakage due to limited transistor sizes, which affects display quality.
Innovation Solution
Incorporating a dummy electrode between the source and drain of the transistor in the display panel, which increases the channel length and shields a portion of the semiconductor layer to reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistor size is reduced to accommodate high PPI display panels, then pixel density is improved, but electricity leakage increases
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between the source and drain electrodes. This dummy electrode is electrically floating and positioned over the semiconductor layer, effectively dividing the channel into two segments. The dummy electrode acts as a mediator that reduces the electric field intensity in the channel region, thereby suppressing electricity leakage without requiring an increase in the overall transistor footprint.
Solution Approach 2:
The channel region is segmented by introducing the dummy electrode, which divides the continuous channel into two separate channel regions. This segmentation reduces the effective electric field strength across each segment, thereby reducing leakage current. The dummy electrode creates a potential barrier that prevents direct carrier flow across the entire channel length, effectively combating leakage in high-density pixel configurations.
2Object-generated harmful factors
If dummy electrode is added to suppress electricity leakage, then leakage current is reduced, but transistor area increases
Solution Approach 1:
The dummy electrode is designed to cover only a partial area of the semiconductor layer, specifically positioned in the channel region where it is most effective at reducing leakage. The dummy electrode does not need to cover the entire semiconductor layer or extend to the full transistor perimeter. This partial coverage approach achieves sufficient leakage suppression while minimizing the additional area occupied by the dummy electrode structure.
Solution Approach 2:
The dummy electrode is strategically positioned in the channel region where leakage current is most problematic, rather than uniformly distributing electrodes across the entire transistor. The dummy electrode's location is optimized to provide maximum leakage suppression effect in the critical channel area while maintaining minimal impact on the overall transistor footprint and preserving space for other pixel components.
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 suppresses electricity leakage, preserves sufficient area for the pixel electrode, and maintains adequate stored capacitance to prevent display quality degradation during low frequency driving.
Implementation Method 1
a portion of the semiconductor layer may be shielded by the dummy electrode to reduce the leakage current generated by the semiconductor layer receiving light
Data Source
AI summary
This invention discloses a display panel includes a substrate and a sub-pixel. The sub-pixel is disposed on the substrate. The sub-pixel includes a transistor, and the transistor includes a gate, a semiconductor layer, a source, a drain, and a dummy electrode. The gate is disposed on the substrate. The semiconductor layer is disposed on the gate. The source and the drain are disposed on the semiconductor layer, the source is disposed at one end of the semiconductor layer, and the drain is disposed at the other end of the semiconductor layer. The dummy electrode is disposed on the semiconductor layer and between the source and the drain. The dummy electrode and the source are separated, the dummy electrode and the drain are separated, and the dummy electrode is electrically floating.