Shared-Node Pixel Circuit for Lower EM Transistor Duty Stress
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Solution Overview
Problem
The reliability of EM transistors in display devices is compromised due to continuous duty-driven operation, leading to stress and potential failure.
Innovation Solution
A pixel circuit design where the source nodes of EM elements between adjacent pixels sharing a data line are connected, allowing multiple light emitting elements to be driven by a single EM device, thereby reducing the duty ratio of EM transistor driving and alleviating stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the EM transistor is continuously driven at 100% duty cycle to maintain luminance, then the luminance stability is improved, but the reliability of the EM transistor deteriorates due to stress
Solution Approach 1:
The patent merges the control of multiple pixel circuits (specifically odd-numbered and even-numbered pixel circuits) into a single EM transistor. By connecting the source nodes of EM elements between adjacent pixels sharing a data line, one EM transistor can drive multiple light emitting elements, thereby reducing the duty ratio of individual EM transistors from 100% to approximately 50%, which alleviates stress and improves reliability while maintaining luminance stability through coordinated operation
Solution Approach 2:
The patent implements periodic action by alternating the operation of EM transistors between different pixel circuits. The EM transistor for odd-numbered pixel circuits operates during one period while the EM transistor for even-numbered pixel circuits operates during the next period, creating a periodic duty cycle pattern that reduces continuous stress on individual transistors while maintaining continuous display output
2Reliability
If separate EM lines and EM signals are added to reduce the duty ratio of EM transistors, then the reliability of EM transistors is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the existing EM signal and EM transistor control structure serve multiple pixel circuits simultaneously. Instead of adding dedicated EM lines for each pixel circuit, the same EM signal line is shared across multiple pixel circuits, allowing one EM transistor to perform the function of controlling multiple light emitting elements, thus reducing device complexity while improving reliability
Solution Approach 2:
The patent enables self-service by utilizing the existing EM signal infrastructure to control multiple pixel circuits without requiring additional EM signal lines. The current path connection between adjacent pixels allows the existing EM signal to automatically serve multiple functions, reducing the need for additional components and simplifying the overall device structure
Data Source
AI summary
A pixel circuit and a display panel including the same are disclosed according to embodiments. The pixel circuit according to embodiments includes a first pixel circuit including a first EM transistor to which a pulse of a first EM signal is applied, and a first driving transistor for driving a first light emitting element; and a second pixel circuit including a second EM transistor to which a pulse of a second EM signal is applied, and a second driving transistor for driving a second light emitting element. A node between the first EM transistor and the first driving transistor and a node between the second EM transistor and the second driving transistor are connected.