OLED Driving Transistor with Curved Parallel Channels
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Solution Overview
Problem
Organic light emitting diode displays face challenges in achieving high luminance while preventing defects such as non-uniform transistor characteristics and luminance variations, especially in bright environments like outdoor settings.
Innovation Solution
The design incorporates a driving transistor with multiple channels, each with curved portions, connected in parallel and symmetrical with respect to an axis, which are electrically connected between the source and drain electrodes, and a storage capacitor to stabilize the gate voltage, ensuring consistent current supply to the organic light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving transistor uses a conventional single-channel structure, then the device complexity is low, but the luminance is insufficient for bright environments
Solution Approach 1:
The driving transistor is divided into multiple parallel channels (first channel and second channel) instead of using a single channel. Each channel includes its own active region, gate electrode, and source/drain electrodes. This segmentation allows the transistor to handle higher currents and achieve higher luminance while maintaining a manageable structural complexity through modular design.
2Manufacturing precision
If the channels are arranged in a simple linear fashion, then the manufacturing precision requirements are low, but the transistor characteristics are non-uniform causing display defects
Solution Approach 1:
The channels are designed with curved portions that create a symmetrical pattern around a central axis. The first channel and second channel are positioned symmetrically with respect to a central axis, with each channel containing curved portions that mirror each other. This symmetrical arrangement ensures uniform electrical characteristics across channels while maintaining manufacturing feasibility through standardized curved geometries.
3Illumination intensity
If the gate voltage is not stabilized, then the device complexity is low, but the current supply is inconsistent causing luminance variations
Solution Approach 1:
A storage capacitor is integrated into the pixel circuit to pre-stabilize the gate voltage of the driving transistor before the emission phase. The capacitor is charged during the programming phase and maintains the gate voltage during emission, ensuring consistent current supply to the organic light-emitting diode. This preliminary stabilization action prevents luminance variations without requiring complex external voltage regulation circuits.
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 enables the organic light emitting diode display to provide high luminance while minimizing the occurrence of defects like stain defects, enhancing display quality and consistency across different environments.
Implementation Method 1
Electrons injected from a cathode which is a first electrode and holes injected from an anode which is a second electrode are combined in the organic emission layer to generate excitons, and the excitons emit light while emitting energy.
Data Source
AI summary
An embodiment provides an organic light emitting diode display including: a substrate; a scan line disposed on the substrate to transfer a scan signal; a data line disposed on the substrate to transfer a data signal; a driving voltage line disposed on the substrate to transfer a driving voltage; a switching transistor connected with the scan line and the data line; a driving transistor connected with the switching transistor; and an organic light emitting diode electrically connected to the driving transistor, wherein the driving transistor includes a gate electrode, a source electrode, a drain electrode, and a plurality of channels, and each of the channels includes a plurality of curved portions.