OLED Driving Circuit Inverter Stages for Stable Partial Refresh
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Solution Overview
Problem
Conventional OLED pixel driving methods suffer from low output stability in driving circuits, particularly in partial refresh modes where certain signals do not require frequent resets or data voltage writing, leading to inefficient power consumption.
Innovation Solution
A driving circuit comprising an output circuit and an inverting circuit with multiple stages of inverters, where the output circuit provides driving signals based on data voltages under control signals, and the inverting circuit inverts signals to enhance stability, including components like data writing circuits, differential control circuits, and switch control circuits to manage signal potentials and connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial refresh mode is used to reduce power consumption, then energy efficiency is improved, but output stability deteriorates
Solution Approach 1:
The driving circuit is divided into multiple independent inverter stages (first inverter, second inverter, third inverter, etc.), where each stage can be independently controlled. This segmentation allows the circuit to implement partial refresh by selectively activating only necessary inverter stages, thereby reducing power consumption while maintaining output stability through the coordinated operation of active stages.
Solution Approach 2:
The driving circuit implements periodic control of inverter stages based on refresh requirements. During partial refresh modes, certain inverter stages are activated periodically rather than continuously, allowing the circuit to reduce power consumption during frame maintaining periods while ensuring output stability is restored when full refresh is needed.
2Reliability
If multiple inverter stages are added to improve output stability, then reliability is improved, but device complexity increases
Solution Approach 1:
Each inverter stage in the driving circuit is designed with multi-functionality, serving both as a signal inverting element and as a controllable switching element. The inverters can operate in different modes (full refresh, partial refresh, frame maintaining) based on control signals, allowing the same circuit structure to provide both stability and flexibility without requiring additional dedicated components.
Solution Approach 2:
The driving circuit employs dynamic control of inverter stages through control signals (first control signal, second control signal, third control signal). The activation state of each inverter stage can be dynamically adjusted based on refresh requirements, allowing the circuit to adapt its complexity level - using more stages when stability is needed and fewer stages when power savings are prioritized.
Data Source
AI summary
A driving circuit, driving method, and display device are provided. The drive circuit includes output circuit and inverting circuit; the output circuit provides driving output signal via the driving output terminal based on data voltage under control of switch control signal and output control signal; the inverting circuit includes N stages of inverters, N is positive integer; input terminal of first inverter is electrically connected to the driving output terminal, and output terminal of N-th inverter is electrically connected to driving signal output terminal; if N is greater than 1, output terminal of m-th inverter is electrically connected to input terminal of (m+1)-th inverter, m is positive integer less than N; the inverter inverts signal received by its input terminal to obtain inverted signal and output it via its output terminal. The drive circuit has high output stability.