OLED Display Panel Shielding Layout for ESD Risk Reduction
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Solution Overview
Problem
Organic light-emitting diode (OLED) screens are prone to electro-static discharge (ESD) due to serrated edges in bottom shielding metals, which affects the display effect and service life, despite efforts to shield pixel driving circuits with metals.
Innovation Solution
A display panel design featuring a shielding layer with converging wires electrically connected to shielding blocks, where power supply lines are connected through holes in the shielding layer, arranged to minimize the current path and reduce charge accumulation, thereby reducing the risk of ESD damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bottom shielding metals with serrated edges are used to shield pixel driving circuits, then shielding effectiveness is improved, but electro-static discharge (ESD) damage occurs at tips of serrations
Solution Approach 1:
The shielding layer is divided into multiple shielding blocks arranged in parallel, each connected to power supply lines through separate through-holes. This segmentation eliminates continuous serrated edges while maintaining shielding effectiveness through distributed blocking of electric fields.
Solution Approach 2:
The converging wire connects the shielding blocks with curved or rounded pathways instead of sharp angular connections. This curvature eliminates tips and corners where charge accumulation would occur, preventing ESD explosions while maintaining electrical connectivity.
2Reliability
If shielding layer is added to protect pixel driving circuits, then circuit protection is improved, but device complexity increases
Solution Approach 1:
The shielding layer is merged with the pixel driving circuit layer in the same substrate plane, with shielding blocks positioned adjacent to circuit components. This integration provides protection without adding separate protective layers, maintaining structural simplicity.
Solution Approach 2:
The shielding blocks serve multiple functions: they shield pixel driving circuits from electromagnetic interference, provide electrical connection pathways through converging wires, and act as charge dissipation structures. This multi-functionality reduces the need for additional dedicated protective components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces the occurrence of ESD damage to the shielding layer, enhancing the display panel's reliability and service life by ensuring the current path is within the converging wire boundaries and conducted along the shortest distance, thus minimizing charge accumulation.
Implementation Method 1
a shielding layer located on the substrate, wherein the shielding layer includes a plurality of shielding blocks and a converging wire electrically connected to the plurality of shielding blocks
Implementation Method 2
The plurality of power supply lines are electrically connected to the converging wire through a plurality of through holes
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a shielding layer, a pixel driving circuit layer located on the shielding layer and including a plurality of pixel driving circuits at least partially overlapping the shielding layer, and a power supply line electrically connected to a plurality of through holes of the shielding layer disposed in the pixel driving circuit layer. A converging line between adjacent through holes are arranged according to a shortest distance between the adjacent through holes.