Display Pixel Circuit Overlap Layout for NMOS Kickback Control
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Solution Overview
Problem
The kickback voltage characteristics in organic light-emitting display devices are affected by the replacement of PMOS transistors with NMOS transistors, leading to potential excessive reduction of the gate electrode voltage.
Innovation Solution
The display device incorporates a conductive pattern that overlaps scan lines, including a stem part and branch parts, to manage parasitic capacitance and prevent excessive gate electrode voltage reduction, with specific transistor configurations and materials like polycrystalline silicon and oxide semiconductors used for PMOS and NMOS transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NMOS transistors are used to replace PMOS transistors in the display device, then the transistor performance is improved, but the gate electrode voltage is excessively reduced due to kickback voltage
Solution Approach 1:
The patent introduces a conductive pattern as an intermediary element between the scan lines and the gate electrode of the first transistor. This conductive pattern includes a stem part and branch parts that extend toward and overlap with the scan lines, creating parasitic capacitance that acts as a mediator to counterbalance the kickback voltage effect and stabilize the gate electrode voltage.
Solution Approach 2:
The conductive pattern is designed to preemptively counteract the kickback voltage effect before it can excessively reduce the gate electrode voltage. By creating controlled parasitic capacitance through the conductive pattern's overlap with scan lines, the system prepares an opposing electrical effect that balances the harmful voltage reduction in advance.
2Stability of the object's composition
If a conductive pattern is added to stabilize gate electrode voltage, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The conductive pattern serves multiple functions simultaneously: it stabilizes the gate electrode voltage by counteracting kickback effects, acts as an electrical connector between circuit elements, and creates the necessary parasitic capacitance for voltage compensation. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The conductive pattern merges the functions of voltage stabilization, electrical connection, and capacitance provision into a single integrated structure. The stem part and branch parts are combined in one continuous conductive element rather than using separate components, simplifying the overall device architecture.
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 configuration effectively stabilizes the gate electrode voltage, reducing leakage and enhancing the display's performance by compensating for threshold voltage variations and parasitic capacitance.
Implementation Method 1
the conductive pattern overlaps the first scan line and the second scan line... to manage parasitic capacitance and prevent excessive gate electrode voltage reduction
Implementation Method 2
an organic light-emitting display device displays an image using an organic light-emitting device, which emits light through recombination of electrons and holes
Data Source
AI summary
A display device including a light-emitting diode, a first transistor, a second transistor, a data line connected to the second transistor and configured to transmit a data signal, a third transistor, a first signal line connected to a gate electrode of the second transistor and configured to transmit a first signal, a second signal line connected to a gate electrode of the third transistor and configured to transmit a second signal, and a connect portion connected to a gate electrode of the first transistor and an electrode of the third transistor, in which the connect portion overlaps the first signal line and the second signal line, and an overlapping area between the connect portion and the first signal line is different from an overlapping area between the connect portion and the second signal line.