OLED Driving Circuit with Integrated Compensation and Aging Alleviation
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Solution Overview
Problem
Conventional OLED driving circuits face challenges in maintaining consistent driving currents due to threshold voltage differences among transistors, leading to non-uniform luminance and accelerated aging of OLED light emitting elements, which limits display resolution and lifespan.
Innovation Solution
A driving circuit comprising a signal line, control line, driving unit, power supply unit, compensation unit, light emitting control unit, data writing unit, storage unit, and aging alleviation unit, which performs threshold voltage compensation and removes non-recombined carriers by short-circuiting the cathode and anode, ensuring consistent driving currents and extending the lifespan of OLED elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED driving circuit uses at least seven transistors to achieve threshold voltage compensation and aging alleviation, then threshold voltage consistency and luminescent material lifespan are improved, but device complexity increases and display resolution is limited
Solution Approach 1:
The patent combines the threshold voltage compensation function and aging alleviation function into a single integrated circuit structure. The driving unit includes a driving transistor, compensation transistor, storage capacitor, and aging alleviation transistor that work together in a unified design, eliminating the need for separate compensation circuits and reducing the total transistor count from seven or more to six transistors while maintaining both functions simultaneously.
Solution Approach 2:
The driving circuit is designed with multi-functional components that perform multiple operations. The same circuit structure and transistors are used for both threshold voltage compensation during the compensation phase and aging alleviation during the emission phase, making the circuit universal and reducing overall complexity while achieving both objectives.
2Duration of action of stationary object
If conventional OLED driving circuit uses at least seven transistors to achieve threshold voltage compensation and aging alleviation, then luminescent material lifespan is improved, but display resolution is limited
Solution Approach 1:
The patent merges the aging alleviation function with the threshold voltage compensation function in a single integrated circuit. The same six transistors and associated components perform both functions at different time phases, reducing the transistor count from seven or more to six while maintaining the aging alleviation capability that extends luminescent material lifespan.
Solution Approach 2:
The circuit operates in periodic phases where different transistors are activated at different times. During the compensation phase, certain transistors are on to perform threshold voltage compensation, while during the emission phase, the aging alleviation transistor is activated to remove carriers. This periodic operation allows the same circuit structure to perform multiple functions without requiring additional transistors for each function.
Data Source
AI summary
Provided are a driving circuit and a driving method thereof, and a display device. The driving circuit includes a signal line, a control line, a driving unit, a power supply unit, a compensation unit, a light emitting control unit, a data writing unit, a storage unit, and an aging alleviation unit, wherein the driving unit is configured to drive a light emitting element; the light emitting control unit is configured to control the light emitting element to emit light; the data writing unit is configured to write the data signal into the storage unit; the compensation unit is configured to perform threshold voltage compensation for the driving unit; and the aging alleviation unit is configured to short-circuit a cathode and an anode of the light emitting element.