OLED Display Panel Adhesive Segmentation for Color Aberration
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Solution Overview
Problem
In OLED display panels with a top-emission WOLED and color filter layer configuration, the large thickness of the transparent adhesive between the layers leads to light leakage and color aberration under large viewing angles, resulting in a decreased display effect due to the self-luminescent property of WOLEDs.
Innovation Solution
The OLED display panel design includes a first thin film packaging layer covering the OLED layer and bonded to the array substrate, with a color filter layer on one side of the packaging layer and a bonding adhesive filling the gap between the substrates, reducing the distance between the OLED and color filter layers and enhancing waterproofing by using silicon nitride or silicon oxynitride packaging layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a transparent adhesive with relatively large thickness is used between the color filter layer and the WOLED layer, then the bonding strength between layers is improved, but the distance between the color filter layer and the WOLED layer increases, causing light to pass through to adjacent sub-pixel units and resulting in color mixture and color aberration under large viewing angles
Solution Approach 1:
The patent segments the adhesive system into two distinct parts: a thin first adhesive layer positioned between the WOLED layer and the color filter layer to minimize light leakage and color mixture, and a second thick adhesive layer positioned between the color filter layer and the package cover plate to provide sufficient bonding strength. This segmentation allows each adhesive layer to perform its specific function optimally without compromising the other.
2Object-affected harmful factors
If the distance between the color filter layer and the WOLED layer is reduced to prevent color mixture, then the display effect under large viewing angles is improved, but the bonding strength between layers may be insufficient
Solution Approach 1:
The patent divides the adhesive system into two functional layers: a first adhesive layer with small thickness placed between the WOLED layer and the color filter layer to prevent color mixture, and a second adhesive layer with large thickness placed between the color filter layer and the package cover plate to provide sufficient bonding strength. This segmentation resolves the contradiction by assigning different thickness requirements to different locations.
3Reliability
If a thick transparent adhesive is used to bond the package cover plate, then the waterproofing and structural integrity are improved, but the light from the WOLED layer can laterally travel through the adhesive to reach color filters of other sub-pixel units
Solution Approach 1:
The patent segments the adhesive system into two parts: a thin first adhesive layer between the WOLED layer and the color filter layer to prevent light leakage and color aberration, and a thick second adhesive layer between the color filter layer and the package cover plate to ensure waterproofing and structural integrity. This segmentation allows the thick adhesive to provide protection without causing optical interference.
Solution Approach 2:
The first adhesive layer acts as an intermediary between the WOLED layer and the color filter layer, controlling the optical path and preventing light from reaching adjacent sub-pixel units. Meanwhile, the second adhesive layer serves as an intermediary between the color filter layer and the package cover plate, providing mechanical and environmental protection. Each adhesive layer mediates specific interactions without interfering with the other's function.
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
This configuration minimizes light leakage and color aberration, improves the display effect by reducing color mixture under large viewing angles, and enhances the reliability and waterproofing of the OLED panel.
Implementation Method 1
a first thin film packaging layer, covering the OLED layer and bonded to the array substrate
Implementation Method 2
a bonding adhesive, filled between the array substrate and the package cover plate to bond the array substrate and the package cover plate
Implementation Method 3
enhancing waterproofing by using silicon nitride or silicon oxynitride packaging layers
Data Source
AI summary
An OLED display panel and a fabrication method thereof, and a display device are disclosed. The OLED display panel comprises: an array substrate and a package cover plate disposed opposite to each other, and an OLED layer which is formed on a surface of the array substrate facing the package cover plate and comprises a plurality of OLEDs. The OLED display panel further comprises: a first thin film packaging layer, covering the OLED layer and bonded to the array substrate; a color filter layer, provided on a side of the first thin film packaging layer facing the package cover plate; and a bonding adhesive, filled between the array substrate and the package cover plate to bond the array substrate and the package cover plate, the bonding adhesive covering the color filter layer and the first thin film packaging layer.