Pixel Switching Transistor Leakage Current Reduction
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Solution Overview
Problem
In display devices, a leakage current in pixels can occur due to transistor characteristics, leading to unstable gate voltages and inadequate luminance expression.
Innovation Solution
A pixel structure is implemented with a light emitting element, a driving transistor, and a switching transistor. The switching transistor includes an active layer with conductive regions and channel regions, and a conductive pattern is disposed to overlap the common conductive region, effectively reducing or preventing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switching transistor structure is used, then the device complexity is low, but leakage current occurs causing unstable gate voltage
Solution Approach 1:
The switching transistor is divided into multiple sub-transistors (first sub-transistor and second sub-transistor) connected in series. Each sub-transistor has its own conductive regions and channel region, allowing independent control and reducing overall leakage current while maintaining manageable structural complexity
Solution Approach 2:
The common conductive region is nested within the active layer and shared by both sub-transistors. This nested structure allows the common conductive region to serve dual purposes as both drain for one sub-transistor and source for the other, reducing total device complexity while improving reliability
2Ease of manufacture
If the switching transistor structure is simplified, then the manufacturing is easier, but leakage current cannot be effectively reduced
Solution Approach 1:
The conductive pattern is specifically positioned to overlap only with the common conductive region of the switching transistor, not with other regions. This localized approach targets the specific area where leakage occurs, effectively reducing harmful leakage current while maintaining ease of manufacture through precise but simple patterning
3Object-generated harmful factors
If a conductive pattern is added to overlap the common conductive region, then leakage current is reduced, but the device complexity increases
Solution Approach 1:
The conductive pattern is merged with the existing pixel structure by integrating it into the active layer formation process. The conductive pattern becomes part of the overall transistor architecture rather than a separate added component, reducing the perceived complexity while still achieving leakage current reduction
Data Source
AI summary
A display device includes pixels at least one of which includes a light emitting element connected between a first power source and a second power source, a first transistor connected between the first power source and the light emitting element and controlling a driving current flowing through the light emitting element in response to a voltage of a first node, a switching transistor connected to the first node and including and active layer that includes first and second conductive regions spaced apart from each other, first and second channel regions disposed between the first and second conductive regions, and a common conductive region disposed between the first and second channel regions, and a conductive pattern overlapping the active layer to face the common conductive region.