OLED Driving Circuit Transistor Reduction via Extraction
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Solution Overview
Problem
Existing electronic circuit configurations for driving elements like OLEDs are complex and costly due to the high number of transistors required, which decreases the aperture ratio and increases manufacturing costs, and it is challenging to reduce the number of transistors while maintaining stable operation.
Innovation Solution
The proposed electronic circuit simplifies the configuration by using a driving transistor, a switching element, and a capacitive element, where the conductive state between the transistor terminals is controlled by a gate voltage, allowing for stable operation by suppressing the influence of voltage variations and noise, and reducing the number of transistors to two per unit circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the total number of transistors in a unit circuit is increased to compensate for threshold voltage errors, then the reliability of the driven element is improved, but the device complexity increases and manufacturing costs increase
Solution Approach 1:
The patent extracts and eliminates the light emission control transistor from the unit circuit, reducing the total number of transistors from three to two. The remaining two transistors (driving transistor and switching element) are sufficient to achieve reliable operation by controlling the gate voltage of the driving transistor through the switching element, thereby maintaining compensation capability while simplifying the circuit structure.
Solution Approach 2:
The switching element serves multiple functions: it acts as a control switch for the gate voltage of the driving transistor, enables the capacitive element to charge and discharge the gate voltage, and facilitates the compensation of threshold voltage errors. This multi-functionality reduces the need for separate dedicated components.
2Reliability
If the total number of transistors in a unit circuit is increased, then the reliability is improved, but the aperture ratio decreases
Solution Approach 1:
By removing the light emission control transistor from the unit circuit, the patent reduces the total transistor count from three to two. This elimination frees up space in the unit circuit layout, thereby increasing the aperture ratio while maintaining the compensation for threshold voltage errors through the remaining two transistors.
3Reliability
If the total number of transistors in a unit circuit is increased, then the reliability is improved, but the manufacturing costs increase
Solution Approach 1:
The patent eliminates the light emission control transistor, reducing the unit circuit from three transistors to two transistors. This reduction directly lowers manufacturing costs while maintaining reliable operation through the driving transistor and switching element that work together to control the gate voltage and compensate for threshold voltage variations.
4Ease of operation
If a light emission control transistor is included in the unit circuit, then the control of electric current to the OLED element is improved, but the device complexity increases
Solution Approach 1:
The switching element performs the function of controlling electric current to the OLED element by switching the gate voltage of the driving transistor. Instead of using a separate light emission control transistor, the switching element integrates this control function, reducing the total transistor count while maintaining ease of operation.
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 drives the driven element while compensating for threshold voltage errors, reducing manufacturing costs and increasing the aperture ratio by simplifying the circuit and minimizing the number of transistors, thus providing stable and efficient operation.
Implementation Method 1
The capacitive element includes a first electrode connected to the gate terminal of the driving transistor and a second electrode connected to the signal line
Data Source
AI summary
An electronic circuit drives a driven element. The electronic circuit includes a signal line, a unit circuit connected to the signal line, and a voltage supply line. The unit circuit includes a transistor, a switch, and a capacitive element. The transistor includes a gate terminal, a first terminal, a second terminal connected to the voltage supply line, and a channel between the first and second terminals. The switch controls electrical connection between the gate terminal and one of the first and second terminals. A conductive state between the first and second terminals is controlled by a gate voltage applied to the gate terminal. During a first period, the switch is changed from an off state to an on state. During a second period, the switch is changed to an off state.