Grid-like Metal Layer for Flat Electrode in Display Panel
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Solution Overview
Problem
The manufacturing of organic light emitting display panels results in a non-flat surface for the organic light emitting diode, leading to scattering issues that affect display quality due to the reflection of ambient light by the first electrode, which is not flat and has high reflectivity.
Innovation Solution
A first metal layer with multiple first metal portions and grooves is used to create a grid-like surface on the substrate, allowing for a more even organic film pattern and reducing the segment difference of the organic layer, thereby improving the flatness and reducing light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first electrode is manufactured on a non-flat substrate surface, then the manufacturing process is simplified, but light scattering increases and display quality deteriorates
Solution Approach 1:
A planarization layer is formed on the substrate before manufacturing the first electrode. This preliminary action creates a flat surface for subsequent electrode deposition, ensuring uniform thickness and reducing light scattering, while maintaining the simplicity of the overall manufacturing process by integrating this step into the existing fabrication sequence.
2Power
If the first electrode has high reflectivity, then light emission efficiency is improved, but ambient light reflection increases causing display quality issues
Solution Approach 1:
The planarization layer is applied specifically in regions where the first electrode will be formed, creating localized flat surfaces only where needed. This allows the electrode to maintain its high reflectivity for efficient light emission while the planarized regions minimize unwanted ambient light reflection that would otherwise occur on uneven surfaces.
Data Source
AI summary
Provided display panel includes a substrate, a light emitting unit and a first metal layer. The light emitting unit includes a first electrode, a light emitting layer and a second electrode sequentially laminated in a light emitting direction. The first metal layer includes multiple first metal portions extending in a first direction, a side surface of the first metal portion facing away from the substrate provided with multiple first grooves extending in first direction and arranged in second direction. The first groove forms a grid-like surface on a side of the first metal portion facing away from the substrate. The first electrode enabled to have a relatively flat surface, whereby scattering phenomenon of light emitted by the light emitting element and scattering phenomenon of the first electrode on the reflected ambient light is ameliorated, the scattering problem of the display panel is resolved, and the display effect is improved.