AMOLED Anode Layout to Eliminate Horizontal Diffraction Fringes
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Solution Overview
Problem
Conventional AMOLED display panels have uneven anode surfaces due to the direct arrangement of source and drain metal layers, leading to strong horizontal diffraction fringes and reduced flatness.
Innovation Solution
A display panel design featuring a substrate with a source and drain metal layer, a first and second planarization layer, an auxiliary metal layer, and an anode, where the auxiliary metal layer is electrically connected to the source and drain metal layer through via holes, forming a double-layer structure that improves the flatness of the anode surface by removing the auxiliary metal layer directly under the anode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the source and drain metal layer is arranged directly below the anode, then the device structure is simple, but the anode surface becomes uneven and generates horizontal diffraction fringes
Solution Approach 1:
The patent extracts the auxiliary metal layer from the region directly beneath the anode. By removing this specific portion of the metal layer, the anode surface achieves better flatness and eliminates the horizontal diffraction fringes caused by the convex auxiliary metal layer, while maintaining the overall device structure through the double-layer source and drain metal layer configuration
Solution Approach 2:
The source and drain metal layer is segmented into two functional parts: the first planarization layer that provides a flat surface for the anode, and the auxiliary metal layer that is strategically positioned to avoid directly beneath the anode. This segmentation allows each layer to perform its specific function optimally without interfering with the other
2Reliability
If the auxiliary metal layer is positioned to improve electrical connection, then electrical conductivity is enhanced, but the anode surface flatness deteriorates
Solution Approach 1:
The first planarization layer acts as an intermediary between the source and drain metal layer and the anode. It provides a flat, smooth surface that ensures good electrical connection and contact with the anode, while preventing the auxiliary metal layer from directly influencing the anode surface geometry. This intermediary layer resolves the conflict between electrical conductivity and surface flatness
Data Source
AI summary
A display panel and a display device are provided. The display panel comprises a substrate, a source and drain metal layer, a first planarization layer, an auxiliary metal layer, a second planarization layer, an anode and a light emitting pixel. The anode comprises a first anode part corresponding to the light emitting pixel. By removing the auxiliary metal layer directly below the first anode part, the orthographic projection of the auxiliary metal layer on the substrate is outside the orthographic projection of the first anode part on the substrate, which helps to eliminate horizontal diffraction fringes.