Switching Transistor Active Layer Extension for Leakage Reduction
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Solution Overview
Problem
In OLED display panels, leakage currents in switching transistors during the light-emitting phase lead to unstable driving currents, affecting light-emitting brightness and display quality due to manufacturing process variations and process abnormalities.
Innovation Solution
The redesign of active layers in switching transistors with extension portions that overlap with gate control lines to form capacitors, adding voltage stabilizing sub-circuits to reduce leakage currents and stabilize the potential of the control electrode, thereby improving the stability and continuity of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extension portions are added to the active layer of switching transistors to form capacitors with gate control lines, then leakage current is reduced and voltage stability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention merges the extension portion of the active layer with the gate control line to form a capacitor structure. The extension portion serves dual purposes: as part of the transistor active layer and as one electrode of the capacitor, while the gate control line serves as the other electrode. This merging reduces the need for separate capacitor structures and simplifies manufacturing.
Solution Approach 2:
The extension portion of the active layer performs multiple functions: it acts as part of the transistor's conductive path and simultaneously serves as an electrode for the capacitor formed with the gate control line. This multi-functionality reduces the overall device complexity by eliminating the need for dedicated capacitor electrodes.
2Stability of the object's composition
If extension portions overlap with gate control lines to form capacitors, then voltage stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
By merging the extension portion with the gate control line to form the capacitor, the invention reduces the number of separate alignment steps required. The gate control line serves dual purposes as both the control electrode for the transistor and one electrode of the capacitor, reducing alignment complexity.
Solution Approach 2:
The gate control line automatically serves as one electrode of the capacitor without requiring additional structures or alignment steps. The extension portion of the active layer self-aligns with the gate control line during the transistor fabrication process, reducing the need for separate capacitor electrode alignment.
3Reliability
If voltage stabilizing sub-circuits are added to reduce leakage currents, then light-emitting stability is improved, but device complexity increases
Solution Approach 1:
The invention merges the voltage stabilizing function into the existing transistor structure by forming capacitors using the extension portions and gate control lines. This integration avoids adding separate voltage stabilizing circuits and reduces overall device complexity.
Solution Approach 2:
The extension portions and gate control lines automatically form capacitors that provide voltage stabilizing functionality without requiring additional circuit elements. The existing structural components serve the dual purpose of transistor operation and voltage stabilization.
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 reduces leakage currents and stabilizes the driving signal, enhancing the stability and continuity of light emission, thus improving the display's brightness and reducing the occurrence of poor bright and dark spots.
Implementation Method 1
at least a portion of an orthogonal projection of the extension portion on the base is overlapped with an orthogonal projection of a gate control line on the base
Data Source
AI summary
A display panel includes a base, a plurality of sub-pixels and a plurality of gate control lines that are disposed on the base. Each sub-pixel includes a pixel circuit. The pixel circuit includes a driving transistor and at least one first switching transistor electrically connected to a control electrode of the driving transistor. Each pixel circuit is electrically connected to at least two gate control lines. A first switching transistor includes an active layer. The active layer includes an active layer body and at least one extension portion, and the active layer body includes at least one channel portion and at least one conductive portion. An extension portion is electrically connected to a conductive portion of the active layer body. At least a portion of an orthogonal projection of the extension portion on the base is overlapped with an orthogonal projection of a gate control line on the base.