Display Stage Circuit for Emission Duty Control Across Luminance Modes
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Solution Overview
Problem
Existing display devices struggle to efficiently adjust the duty of emission control signals in low and high luminance modes, affecting light emission efficiency and pixel performance.
Innovation Solution
A stage design that includes a node controller and output unit to control voltage levels and emission control signals, utilizing transistors and capacitors to manage control nodes and gate voltages, allowing for adjustment of emission control signals based on luminance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the emission control signal duty is adjusted for low luminance mode, then the light emission efficiency of pixels is improved, but the device complexity increases due to additional control circuits
Solution Approach 1:
The stage circuit is designed to perform multiple functions: it controls emission timing through clock signals, adjusts duty cycle for different luminance modes, and maintains control node voltages. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby improving light emission efficiency without proportionally increasing device complexity.
Solution Approach 2:
The circuit adjusts the duty cycle of the emission control signal by changing the timing parameters of clock signals and control node voltages. By dynamically modifying these electrical parameters based on luminance mode requirements, the circuit achieves efficient low luminance operation while using the same hardware structure.
2Reliability
If the stage controls voltage levels and emission control signals for both low and high luminance modes, then display performance is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The stage employs dynamic control of voltage levels and signal timing to adapt to different luminance modes. The control nodes and transistors dynamically adjust their operating states based on clock signals and mode selection, allowing the circuit to handle both low and high luminance requirements with a single design rather than requiring separate optimized circuits for each mode.
Solution Approach 2:
The control function is segmented into distinct control nodes (first control node and second control node) that can be independently managed. This segmentation allows precise control of different voltage levels for different luminance modes, improving display performance while making the voltage control more manageable and less prone to manufacturing variations.
3Measurement precision
If the node controller manages multiple control nodes and selection signals, then the emission control signal duty adjustment becomes more accurate, but the ease of operation decreases
Solution Approach 1:
The node controller automatically manages the control nodes and selection signals based on the input clock signals and mode information. The circuit self-regulates the voltage levels and timing without requiring external intervention or complex manual control, achieving accurate duty cycle adjustment while maintaining ease of operation through automated control.
Data Source
AI summary
A stage includes a node controller controlling a voltage of a first control node and a second control node, according to a first input signal, a second input signal, and a third input signal, a node maintenance unit maintaining the voltage of the first control node constant, according to a first selection signal and the voltage of the second control node, and an output unit supplying a first gate voltage supplied to a first power terminal or a second gate voltage supplied to a second power terminal to an output terminal, according to a second selection signal, the voltage of the first control node, and the voltage of the second control node, the first selection signal is the second input signal or a signal having the first gate voltage, and the second selection signal is the third input signal or a signal having the second gate voltage.