OLED Scan Driver Circuit for Simultaneous and Progressive Driving
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Solution Overview
Problem
Existing scan drivers for organic light emitting displays face complexity in integrating simultaneous and progressive driving stages, leading to increased transistor and capacitor counts, which complicates the circuit structure and power management.
Innovation Solution
A scan driver design that integrates multiple stages with PMOS transistors and capacitors, allowing for simultaneous and progressive output of scan signals through distinct power source management, simplifying the circuit structure by sharing transistors and capacitors across stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate circuits are used for simultaneous and progressive driving stages, then driving functionality is achieved, but device complexity increases
Solution Approach 1:
The patent combines simultaneous driving and progressive driving circuits into a single integrated circuit structure. The same circuit performs both driving modes by switching between different operating states, eliminating the need for separate circuits and reducing overall device complexity while maintaining full driving functionality.
Solution Approach 2:
The circuit is designed with multi-functionality to perform both simultaneous driving and progressive driving operations. By using the same transistors and capacitors for different driving modes through configuration switching, the circuit achieves universal functionality without requiring duplicate components for each mode.
2Adaptability or versatility
If multiple transistors and capacitors are used for dual driving modes, then driving versatility is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the transistor and capacitor networks required for simultaneous and progressive driving into a shared structure. The same transistors (e.g., first through ninth transistors) and capacitors are reused across both driving modes, significantly reducing the total component count and simplifying manufacturing processes.
Solution Approach 2:
Each transistor and capacitor in the circuit is designed to serve multiple functions depending on the driving mode. For example, the first transistor processes clock signals during progressive driving while the same transistor handles different signal paths during simultaneous driving, maximizing component utilization and reducing manufacturing complexity.
3Use of energy by stationary object
If complex power management is implemented for both driving stages, then power control capability is improved, but device complexity increases
Solution Approach 1:
The power management structure integrates control for both simultaneous and progressive driving stages into a unified system. The first and second power sources are managed through a single control mechanism that adjusts power delivery based on the active driving mode, eliminating the need for separate power management circuits and reducing overall complexity.
Data Source
AI summary
Embodiments may provide a scan driver including a plurality of stages for simultaneously outputting first scan signals in a simultaneous driving period and for progressively outputting second scan signals in a progressive driving period, wherein each of the stages includes a first signal processing unit coupled to an input terminal, a first clock terminal, a third clock terminal, an auxiliary terminal, a first power source terminal, and a second power source terminal to output a first output signal and a second output signal, and a second signal processing unit coupled to a second clock terminal and the first power source terminal to receive the first output signal and the second output signal and to output a first scan signal and a second scan signal to an output terminal.