Emission Control Line Driver for Adjustable OLED Pulse Width
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Solution Overview
Problem
Current organic light emitting display devices face challenges in efficiently controlling luminance based on external light intensity, requiring simpler and more effective methods to adjust emission control signals for optimal performance.
Innovation Solution
An emission control line driver is designed with even-numbered and odd-numbered stages driven by distinct clock signals, utilizing input units to control node voltages and generate emission control signals, allowing for arbitrary adjustment of pulse widths to control pixel turn-on times and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the emission control signal width is fixed by conventional driving methods, then the circuit structure remains simple, but the luminance control adaptability to external light intensity is insufficient
Solution Approach 1:
The emission control signal width is made dynamically adjustable rather than fixed. The driver circuit responds to external light intensity conditions by varying the pulse width of emission control signals, enabling adaptive luminance control. This dynamic adjustment allows the display to optimize performance under different lighting environments without requiring complex additional control systems.
Solution Approach 2:
The invention changes the temporal parameter (pulse width) of the emission control signal to control luminance. By adjusting the width of the emission control pulse in response to external light intensity, the system achieves adaptive luminance control through a single adjustable parameter rather than requiring complex multi-parameter control mechanisms.
2Manufacturing precision
If a single clock signal is used for all stages, then the circuit design is simpler, but the precision of emission control signal timing and width adjustment is limited
Solution Approach 1:
The clock signal system is segmented into multiple independent clock signals (first clock signal for even-numbered stages, second clock signal for odd-numbered stages). This segmentation allows each stage to be independently controlled with precise timing, enabling accurate adjustment of emission control signal widths while maintaining modular circuit architecture.
Solution Approach 2:
Different clock signals are applied to even and odd numbered stages, creating an asymmetric driving scheme. This asymmetric approach allows independent optimization of timing for different groups of stages, improving the precision of emission control signal generation without requiring a completely complex symmetric multi-clock system.
3Productivity
If the emission control signal width cannot be adjusted, then the driving circuit remains simple, but the display performance under varying light conditions deteriorates
Solution Approach 1:
The emission control line driver incorporates feedback mechanisms that respond to external light intensity conditions. The circuit monitors lighting environment and adjusts the emission control signal width accordingly, creating a closed-loop system that optimizes display performance. This feedback-based approach enables adaptive performance improvement without requiring overly complex external control systems.
Data Source
AI summary
An emission control line driver includes even-numbered stages that are connected to even-numbered emission control lines, respectively, and are driven by a first clock signal, and odd-numbered stages that are connected to odd-numbered emission control lines, respectively, and are driven by a second clock signal, wherein each of the stages includes an input unit adapted to receive a control signal and an inverted control signal output from a previous one of the even and odd numbered stages or from an external source, the input unit being adapted to control voltages of a first node and a second node, a first output unit adapted to generate an emission control signal based on the voltages of the first node and the second node, and a second output unit adapted to generate an inverted emission control signal based on the voltages of the first node and the second node.