OLED Display Transistor Leakage Current Reduction
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Solution Overview
Problem
Organic light emitting diode displays experience flicker due to high leakage current in compensation and initialization transistors, which affects display quality.
Innovation Solution
The implementation of multiple gate electrodes in compensation and initialization transistors, along with varying the width of the initialization voltage line based on the number of gate electrodes and panel position, minimizes leakage current and flicker by differentially disposing transistors for each panel position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single gate electrode is used in compensation and initialization transistors, then the device complexity is low, but leakage current is high causing flicker
Solution Approach 1:
The gate electrode of the compensation transistor and initialization transistor is divided into multiple segments (first gate electrode, second gate electrode, third gate electrode, fourth gate electrode). This segmentation allows independent control of different regions of the transistor channel, enabling better leakage current suppression while maintaining acceptable device complexity through modular design
2Reliability
If multiple gate electrodes are added to reduce leakage current, then flicker is reduced, but the device complexity increases
Solution Approach 1:
Different gate electrodes are applied to different regions of the transistor based on local requirements. The first and second gate electrodes control the main channel region, while the third and fourth gate electrodes control specific leakage paths. This localized control optimizes leakage suppression where needed without unnecessarily complicating the entire transistor structure
3Reliability
If the initialization voltage line width is uniformly increased, then voltage drop is reduced, but the area occupied increases
Solution Approach 1:
The initialization voltage line width is varied locally based on position. In regions where voltage drop is critical (such as near the compensation and initialization transistors), the line width is increased to reduce resistance. In other regions, the standard width is maintained to minimize overall area occupation. This differential design optimizes voltage stability without uniformly increasing the line area
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 effectively reduces flicker and power consumption by optimizing the number of serial gates in vulnerable areas, ensuring reliable initialization and minimizing the possibility of stain caused by voltage drops.
Implementation Method 1
Electrons which are injected from one electrode and holes which are injected from the other electrode are combined in the organic emitting layer to form excitons, and the excitons emit energy, thereby emitting light
Data Source
AI summary
An organic light emitting diode display includes: a substrate, a scan line and a previous stage scan line on the substrate to transmit scan signals; a data line and a driving voltage line crossing the scan line and to transmit a data voltage and a driving voltage, respectively; an initialization transistor connected to the previous stage scan line and the driving voltage line, and including an initialization drain electrode connected to a driving gate electrode of a driving transistor; a compensation transistor connected to the scan line and including a compensation drain electrode connected to the initialization drain electrode; and an organic light emitting diode electrically connected to the driving transistor, wherein at least one of the initialization transistor and the compensation transistor includes a plurality of gate electrodes.