Emission-Control Stage for OLED Display Signal Stability
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Solution Overview
Problem
In organic light emitting displays, emission control signals from stages can be unstable, leading to undesired light emission at incorrect times due to voltage fluctuations and signal interference.
Innovation Solution
The stage design includes an output to supply power from a first or second power source based on node voltages, with input control mechanisms, signal processors, and stabilizers to manage node voltages and signal overlap, using transistors and capacitors to stabilize voltage drops and maintain consistent emission control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stages generate emission control signals based on clock signals, then emission times of pixels are controlled, but voltage fluctuations cause unstable emission control signals leading to undesired light emission
Solution Approach 1:
The patent applies preliminary action by pre-stabilizing voltages at critical nodes (first node and second node) before the emission control signals are generated and output. Stabilizers are configured to maintain these voltages at predetermined levels in advance, ensuring that when the emission control signals are generated based on clock signals, the voltage fluctuations have already been compensated. This prevents unstable voltages from causing undesired light emission, thereby improving signal reliability without adding complex real-time correction mechanisms.
2Ease of operation
If multiple signal processors control node voltages based on multiple inputs, then emission control signals are generated, but voltage drop widths fluctuate causing signal instability
Solution Approach 1:
The patent implements feedback mechanisms where stabilizers continuously monitor and adjust voltages at the first node and second node to maintain them at predetermined levels. The stabilizers receive feedback about the actual voltage states and automatically compensate for deviations caused by voltage drop fluctuations from multiple signal processors. This feedback control ensures that despite the complexity of multiple inputs and signal processors, the output emission control signals remain stable and reliable, preventing undesired light emission.
Data Source
AI summary
A stage including: an output circuit connected to a first node and a second node; an input connected to a third node and a fourth node; and a plurality of signal processors between the output and the input, the plurality of signal processors electrically connecting the first node and the third node and electrically connecting the second node and the fourth node, wherein the input includes: a seventh transistor connected between a first input terminal and the fourth node and having a gate electrode connected to a second input terminal; a plurality of eighth transistors serially connected between the third node and the second input terminal and having gate electrodes connected to the fourth node; and a ninth transistor connected between the third node and a second power source and having a gate electrode connected to the second input terminal.