EOA Circuit Timing for OLED Flicker and Anode Initialization
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Solution Overview
Problem
OLED display panels exhibit flicker phenomena due to low brightness at the beginning of each frame, which is exacerbated by black insertion methods that fail to initialize the anode during black frames, leading to increased average brightness and visible screen flickering.
Innovation Solution
An EOA circuit with a first output module generating a control signal and an inverting output module that synchronously output opposite logic levels to control the operation state and initialization of the light-emitting element's anode, ensuring consistent brightness across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If black insertion is used to improve flicker, then the brightness uniformity is improved, but the anode initialization is not performed during black frames, causing average brightness to increase and flicker to persist
Solution Approach 1:
The patent applies preliminary action by performing anode initialization during the black insertion period before the next frame's light emission. The initialization signal is applied to the anode during black frames to prepare it for subsequent operation, ensuring proper initialization occurs even when the display shows black content. This resolves the contradiction by maintaining both brightness uniformity through black insertion and proper anode initialization through timed signal application.
2Illumination intensity
If multiple black pictures are inserted in one frame, then the flicker phenomenon is reduced, but the average brightness increases because initialization cannot occur during black insertion
Solution Approach 1:
The patent performs anode initialization during the black insertion period as a preliminary action before the next frame's light emission. By applying the initialization signal to the anode during black frames, the system maintains low average brightness while ensuring proper initialization occurs, resolving the contradiction between flicker reduction and energy consumption.
3Ease of operation
If the anode is initialized at the beginning of each frame, then the light emission is controlled, but the brightness fluctuates during black insertion without proper initialization
Solution Approach 1:
The patent applies preliminary action by performing anode initialization during black insertion periods before the next frame's light emission. This timing ensures the anode is properly prepared while maintaining brightness stability, as the initialization occurs during periods when no light is emitted, preventing brightness fluctuations.
Solution Approach 2:
The patent implements periodic action by applying initialization signals to the anode at regular intervals during black insertion periods. This periodic initialization maintains consistent brightness levels across frames while ensuring the anode is properly prepared for each light emission cycle, resolving the contradiction between operational control and brightness stability.
Data Source
AI summary
Provided are an EOA circuit, a display panel, and a display device. The EOA circuit comprises a first output module, used for generating a first control signal on the basis of a plurality of reference voltage signals and a plurality of clock signals, the first control signal being used for controlling the working state of the light-emitting element; and an inverting output module, connected to the first output module, and used for performing inverting conversion on the basis of the first control signal to generate a second control signal, the second control signal being used for controlling to disable initialization of the anode of the light-emitting element when the light-emitting element emits light and controlling to enable initialization of the anode of the light-emitting element when the light-emitting element does not emit light.