OLED Pixel Driving Circuit ESD Protection Sub-Circuit
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Solution Overview
Problem
OLED displays face issues with weak antistatic ability during manufacturing, testing, and transportation, leading to electrostatic discharge (ESD) that can damage pixel driving circuits, particularly affecting the TFTs and resulting in defective products.
Innovation Solution
Incorporating an electrostatic discharge sub-circuit within the pixel driving circuit, comprising transistors that discharge static electricity to other pixels, thereby sharing and dispersing the charge and reducing the risk of damage from ESD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic discharge sub-circuit is incorporated into the pixel driving circuit, then the antistatic ability is improved, but the device complexity increases
Solution Approach 1:
The pixel driving circuit is segmented into functional sub-circuits: a driving sub-circuit for normal operation and an electrostatic discharge sub-circuit for ESD protection. This segmentation allows the ESD protection function to be integrated without completely redesigning the entire pixel driving circuit, thus improving antistatic ability while controlling complexity through modular design.
Solution Approach 2:
The electrostatic discharge sub-circuit uses transistors that can serve dual purposes: participating in normal pixel driving operations and providing ESD protection when needed. This multi-functionality reduces the need for entirely separate protection components, thereby improving reliability without proportionally increasing device complexity.
2Object-affected harmful factors
If transistors are used to discharge static electricity to other pixels, then the harmful factors are reduced, but the loss of information increases due to charge sharing
Solution Approach 1:
The invention converts the harmful effect of static electricity accumulation into a beneficial charge sharing mechanism. When ESD occurs, the electrostatic discharge sub-circuit intentionally allows charge to redistribute across multiple pixels through controlled transistor activation, transforming the harmful concentrated charge into a beneficial distributed state that protects individual pixels from damage.
Solution Approach 2:
The electrostatic discharge sub-circuit acts as an intermediary mechanism between the light-emitting element and the pixel driving circuit. It provides a controlled path for charge redistribution, mediating the harmful ESD event and converting it into a manageable charge sharing process that protects critical circuit components while accepting some charge distribution changes.
Data Source
AI summary
A display panel includes a plurality of pixels and an electrostatic circuit. At least one pixel includes: a pixel electrode; a common electrode; a light-emitting element; and a driving sub-circuit coupled to a scanning signal terminal, a data signal terminal, a light-emitting control signal terminal, a first voltage signal terminal and a first terminal of a light-emitting element, and outputs a first voltage signal from the first voltage signal terminal to the light-emitting element controlled by a scanning signal, a data signal, and a light-emitting control signal. The electrostatic circuit couples a first signal line and a second signal line, the first signal line receives a second voltage signal, and the second signal line receives a third voltage signal and is arranged on a periphery of the plurality of pixels. Common electrodes of the pixels are coupled to each other and to the second signal line.