OLET Driving Circuit Voltage Compensation for Current Balance
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Solution Overview
Problem
Existing driving circuits for organic light emitting field effect transistors (OLETs) face inefficiencies in luminous efficiency and power consumption due to imbalanced hole and electron currents, which are not effectively addressed by conventional 2T1C driving circuits designed for OLEDs.
Innovation Solution
A light emitting unit incorporating an OLET and a driving circuit that supplies a data voltage to the control electrode and a compensation voltage correlated with the data voltage to the first electrode, with the compensation voltage being positively correlated with the data voltage, thereby adjusting the voltage of the first electrode to balance hole and electron currents and enhance luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional 2T1C driving circuits are used for OLET, then the device structure is simple, but the luminous efficiency is low due to imbalanced hole and electron currents
Solution Approach 1:
The patent segments the driving circuit into multiple independent components: first and second voltage supply sources for separate electrode control, multiple switching transistors for phased signal delivery, and storage capacitors for voltage maintenance. This segmentation enables independent optimization of hole and electron current paths, resolving the current imbalance issue while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent dynamically changes voltage parameters applied to different electrodes based on operational requirements. By using separate voltage supply sources that can independently adjust gate voltage, first electrode voltage, and second electrode voltage, the circuit optimizes charge carrier injection and transport, thereby improving luminous efficiency without excessive complexity increase
2Device complexity
If conventional driving circuits are used for OLET, then the circuit design is straightforward, but power consumption is high due to current imbalance
Solution Approach 1:
The patent implements feedback mechanisms through storage capacitors that maintain voltage levels on the gate and electrodes between switching cycles. This feedback ensures stable charge carrier injection and prevents energy-wasting current fluctuations, reducing power consumption while the structured feedback paths keep circuit design systematic rather than overly complex
Solution Approach 2:
The driving circuit employs periodic switching actions through clock signals that control the timing of voltage application to different electrodes. This periodic operation synchronizes hole and electron injection cycles, ensuring efficient recombination events occur at optimal moments, thereby reducing wasted energy while maintaining clear periodic design patterns
3Loss of energy
If voltage is adjusted to balance hole and electron currents, then luminous efficiency improves, but circuit complexity increases
Solution Approach 1:
The patent designs voltage supply sources and switching transistors that serve multiple functions: the same components control both hole injection and electron injection at different time intervals, maintain voltage levels during different operational phases, and coordinate multiple electrode potentials. This multi-functionality achieves current balancing without proportionally increasing circuit complexity
Solution Approach 2:
The circuit applies preliminary voltage adjustments to electrodes before charge carrier recombination occurs. Storage capacitors pre-charge electrodes to optimal potentials, and switching transistors pre-position voltage levels, ensuring that when carriers are injected, the electric field conditions are already optimized for efficient recombination, thereby improving luminous efficiency with controlled complexity
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 approach reduces the proportion of current not used for light emission, maintaining high luminous efficiency while minimizing power consumption by balancing hole and electron currents through controlled voltage adjustments.
Implementation Method 1
two types of charge carriers, namely, holes and electrons, are recombined in the organic semiconductor layer to emit light
Data Source
AI summary
The present disclosure provides a light emitting unit, a driving method thereof, and a display device, belongs to the field of organic light emitting transistor (OLET) display technology, and can at least partially solve the problem of high power consumption of an existing OLET display technique. The light emitting unit includes an OLET and a driving circuit. The driving circuit is coupled to a control electrode and a first electrode of the OLET, and is configured to provide a data voltage to the control electrode of the OLET and provide a compensation voltage correlated with the data voltage to the first electrode of the OLET. A second electrode of the OLET is coupled to a first constant voltage terminal.