Display Panel Control Transistor Hollowed Gate Structure
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Solution Overview
Problem
Organic light-emitting display devices experience non-uniform display due to the drift of the transfer characteristic curve of control transistors, leading to different leakage currents and brightness variations between black and white picture states.
Innovation Solution
A hollowed structure is incorporated into the continuous gate structure of control transistors, forming sub-transistors with reduced voltage between source and drain electrodes, which minimizes the drift of the transfer characteristic curve and leakage current differences across display states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a control transistor is used in the pixel circuit, then the data signal can be written into the gate electrode of the driving transistor, but the transfer characteristic curve of the control transistor drifts when biased for a long time, causing leakage current differences and non-uniform display
Solution Approach 1:
The gate electrode of the control transistor is divided into multiple gate electrodes (first gate electrode and second gate electrode), and the gate insulating layer is correspondingly divided into multiple gate insulating layers. This segmentation allows independent control and optimization of different gate regions, reducing the drift of the transfer characteristic curve by distributing the bias voltage stress across multiple smaller units rather than a single large gate structure.
2Adaptability or versatility
If the control transistor operates in different bias voltage states for different display states, then the driving transistor can be controlled to emit light with different brightness, but the leakage current varies significantly between black and white picture states, resulting in non-uniform display
Solution Approach 1:
Different gate insulating layers are formed with different dielectric constants or thicknesses to create local quality variations. The first gate insulating layer and second gate insulating layer have different properties, allowing different regions of the gate to exert different control effects on the channel. This enables more precise control of the transistor's transfer characteristics across different bias states, reducing leakage current variation and improving display uniformity while maintaining adaptability to different display states.
Data Source
AI summary
Provided are a display panel and a display device. A pixel circuit in the disclosed display panel includes a driving module, a data writing module, a storage module, and at least one control module. The data writing module is configured to write a data signal into a control terminal of the driving module. The storage module is electrically connected to the control terminal of the driving module for maintaining a voltage on the control terminal of the driving module in an emit-lighting phase. The control module is electrically connected to the control terminal of the driving module for writing a signal into the control terminal of the driving module prior to the light-emitting stage. At least one hollowed structure is provided on the continuous gate structure of the control transistor of the control module. At least one channel's width-to-length ratio is different from others among the overlapping portions' channels.