Display Panel Initialization Circuit for Flicker and Bright Spots
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Solution Overview
Problem
Conventional display panels experience issues such as flicker and bright spot defects due to gate electrode leakage during low frequency driving, and the separate drivers for initialization and data writing gate signals increase manufacturing costs and dead space.
Innovation Solution
The display panel integrates an initialization circuit that simultaneously initializes the anode electrode of a light emitting element and the gate electrode of a driving transistor, reducing gate electrode leakage and allowing for integrated drivers, thereby preventing flicker and bright spot defects while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate drivers are used for initialization gate signal and data writing gate signal, then each signal can be driven independently, but device complexity increases and dead space increases
Solution Approach 1:
The patent combines the driver for initialization gate signal and driver for data writing gate signal into a single integrated driver circuit. This integration eliminates the need for separate driver circuits, reduces the overall device complexity, and minimizes dead space while maintaining the ability to independently control both signals through multiplexed output paths.
2Device complexity
If gate electrode leakage is not addressed, then circuit design is simpler, but flicker and bright spot defects occur reducing display quality
Solution Approach 1:
The patent introduces an initialization transistor that performs preliminary action by actively initializing the gate electrode of the driving transistor before the data writing process. This preliminary initialization compensates for gate electrode leakage that occurs over time during low frequency driving, preventing flicker and bright spot defects while maintaining circuit design simplicity.
3Manufacturing precision
If initialization and data writing operations are performed sequentially, then each operation can be optimized independently, but time consumption increases
Solution Approach 1:
The patent implements continuous useful action by overlapping the initialization operation and data writing operation in time. The initialization transistor initiates gate electrode initialization during the data writing phase, and the compensation transistor continues the initialization process into the subsequent period, ensuring continuous operation without idle time and minimizing total operation time while maintaining optimization for both functions.
Data Source
AI summary
A display panel includes a first pixel circuit including a first pixel light emitting element, a first pixel driving transistor which applies a driving current to the first pixel light emitting element and a first pixel writing transistor which applies a data voltage to the first pixel driving transistor, a second pixel circuit disposed adjacent to the first pixel circuit and including a second pixel light emitting element, a second pixel driving transistor which applies a driving current to the second pixel light emitting element and a second pixel writing transistor which applies a data voltage to the second pixel driving transistor, a first initialization transistor including a gate electrode which receives an initialization gate signal, a first electrode connected to an anode electrode of the first pixel light emitting element and a second electrode connected to a gate electrode of the second pixel driving transistor.