Emission Control Driver Signal Transition Optimization
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Solution Overview
Problem
The rising and falling times of emission control signals in light emitting display devices are increased, leading to insufficient compensation time and data charging time for sub-pixels, which deteriorates the reliability of the display.
Innovation Solution
A display device with an emission control driver that includes multiple emission control stages, each comprising an output buffer, a charge/discharge part, and an inverter, which supplies emission control signals to sub-pixels, reducing the rising and falling times of the emission control signal by stabilizing the gate-on and gate-off voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emission control driver uses a simple output structure, then the device complexity is reduced, but the rising time and falling time of the emission control signal increase, deteriorating reliability
Solution Approach 1:
The emission control driver is divided into multiple emission control stages (first emission control stage, second emission control stage, etc.), each responsible for controlling a specific gate line. This segmentation allows each stage to operate independently with optimized timing, reducing the overall rising and falling times of the emission control signal while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent implements dynamic control of the emission control signal by using scan signals to sequentially activate different emission control stages. The timing of each stage is dynamically adjusted based on the scan signal phase, enabling the system to optimize rising and falling times adaptively rather than using fixed timing parameters, thereby improving reliability without requiring overly complex hardware.
2Reliability
If the rising time and falling time of emission control signal are increased, then the emission control driver structure can be simpler, but the compensation time and data charging time of sub pixels become insufficient
Solution Approach 1:
By segmenting the emission control driver into multiple stages that operate sequentially along different gate lines, the patent enables parallel processing of compensation and data charging operations across different sub-pixels. This segmentation allows the system to maintain sufficient compensation time and data charging time without increasing the rising and falling times of individual emission control signals, as multiple stages operate simultaneously at different times.
Solution Approach 2:
The patent performs preliminary compensation and data charging operations during the scan signal activation phases before the emission control signal is fully applied. By initiating these operations in advance and using the sequential activation of emission control stages, the system ensures that compensation time and data charging time are sufficient without requiring longer signal transition times, thereby maintaining display reliability.
Data Source
AI summary
A display device can include a display panel configured to display an image through sub pixels, a first scan driver configured to supply a plurality of first scan signals to a plurality of first gate lines connected to the sub pixels, and an emission control driver configured to supply a plurality of emission control signals to a plurality of third gate lines connected to the sub pixels. The emission control driver includes a plurality of emission control stages configured to supply the plurality of emission control signals, respectively. Each of the plurality of emission control stages can include an output buffer including a first output transistor configured to output a clock signal to an output line by controlling a Q node, and a second output transistor configured to output a high potential power supply voltage to the output line by controlling a QB node.