OLED Pixel Circuit Reset Module for Lateral Leakage Current
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Solution Overview
Problem
OLED display panels face the issue of lateral leakage current due to the electrical conductivity of the common layer, leading to unintended light emission by sub-pixels and resulting in color cast on the display panel.
Innovation Solution
A pixel circuit design that includes an enabling module, a light-emitting control module, and a reset module, connected in series between power and common voltage terminals, with the reset module configured to prevent charge accumulation at the anode of the light-emitting element, ensuring that sub-pixels only emit light as intended.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the common layer is made electrically conductive to enable voltage distribution, then power delivery is improved, but lateral leakage current occurs causing sub-pixels to emit light unintentionally
Solution Approach 1:
The patent segments the control of each sub-pixel by introducing independent light-emitting control modules and reset modules for each sub-pixel. This segmentation allows precise control of current flow paths, preventing lateral leakage between sub-pixels while maintaining the conductive common layer for power distribution.
Solution Approach 2:
The patent introduces reset modules as intermediary components between the common layer and the light-emitting elements. These reset modules act as mediators that can actively clear accumulated charges at the anode, preventing lateral leakage current from causing unintended light emission while allowing the common layer to remain conductive for power delivery.
2Illumination intensity
If the light-emitting control module is activated to transmit driving current, then light emission is enabled, but charge accumulation occurs at the anode causing unintended light emission
Solution Approach 1:
The patent implements preliminary action by activating the reset module before or during the light-emitting phase to proactively clear charges at the anode. This preliminary reset action prevents charge accumulation that would otherwise cause unintended light emission, ensuring reliable control of light emission.
Solution Approach 2:
The patent employs feedback mechanisms where the reset module responds to the state of charge accumulation at the anode. By monitoring and actively managing charge levels through the reset module, the system provides feedback control that prevents unintended light emission while maintaining intended light emission functionality.
3Device complexity
If multiple sub-pixels share a common conductive layer, then device complexity is reduced, but color cast occurs due to lateral leakage current
Solution Approach 1:
The patent segments the control functions for each sub-pixel by introducing dedicated light-emitting control modules and reset modules. This segmentation allows the common conductive layer to be shared for power delivery while each sub-pixel has independent control, preventing lateral leakage current from causing color cast.
Solution Approach 2:
The patent applies local quality by giving each sub-pixel its own control and reset characteristics while sharing the common layer. Each sub-pixel's reset module can be independently controlled to manage local charge accumulation, preventing color cast while maintaining the simplified shared common layer structure.
Data Source
AI summary
A pixel circuit, a light-emitting control circuit, a driving method of a pixel circuit, a display panel, and a display device are provided. The pixel circuit includes an enabling module, a light-emitting control module, a first reset module, and a light-emitting element connected in series between a power voltage terminal and a common voltage terminal. The first reset module is electrically connected to a first terminal of the light-emitting element. The enabling module is configured to generate driving current, and the light-emitting control module is configured to transmit the driving current to the light-emitting element. The first reset module is configured to reset the first terminal of the light-emitting element. A control terminal of the light-emitting control module is configured to receive a first light-emitting control signal, and a control terminal of the first reset module is configured to receive a second light-emitting control signal.