OLED Display Panel Light Extraction Layer Pixel Grooves
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Solution Overview
Problem
OLED display devices face challenges in packaging due to sensitivity to water vapor and oxygen, and existing methods for improving light extraction efficiency are complex and difficult to implement, leading to low photon utilization and potential damage to internal organic film layers.
Innovation Solution
An OLED display panel with a thin film packaging layer comprising inorganic barrier layers and organic buffer layers, featuring pixel grooves for a light extraction layer made of titanium dioxide sol or magnesium oxide sol, which is sealed by a flattening film to enhance light extraction efficiency and protect against water vapor and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging methods using hard package covers are used, then packaging protection is achieved, but flexibility is lost
Solution Approach 1:
The patent replaces hard package covers with thin film packaging layers consisting of multiple inorganic barrier layers and organic buffer layers. This thin film structure provides the necessary packaging protection while maintaining flexibility, enabling the OLED display to be applied to flexible substrates and achieve bendable or wearable display applications.
2Reliability
If multiple inorganic barrier layers and organic buffer layers are stacked, then packaging performance is improved, but device complexity increases
Solution Approach 1:
The patent employs a composite thin film packaging structure alternating inorganic barrier layers (such as silicon nitride, silicon oxide) and organic buffer layers (such as silicon carbon nitride). This composite material approach achieves superior packaging performance with WVTR less than 10^-6 g/m2/day while managing the complexity through systematic layer design and integration with existing OLED manufacturing processes.
3Illumination intensity
If light extraction layer is inserted inside OLED, then light extraction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent forms the light extraction layer within pixel grooves that are pre-formed on the inorganic barrier layer during the thin film packaging process. This preliminary structuring allows the light extraction layer to be integrated without requiring separate complex manufacturing steps, as the pixel grooves are created during normal packaging layer deposition processes.
Solution Approach 2:
The pixel grooves serve as an intermediary structure that facilitates the integration of the light extraction layer into the thin film packaging system. The grooves provide a predefined location and structure for the light extraction material, simplifying the manufacturing process by eliminating the need for complex alignment and positioning steps.
4Illumination intensity
If light extraction layer is placed inside OLED component, then light extraction efficiency is improved, but internal organic film layers may be damaged
Solution Approach 1:
The patent segments the light extraction layer from the internal OLED organic film layers by placing it within the thin film packaging layer structure. The pixel grooves and flattening film create a separate compartment that houses the light extraction material, preventing direct contact with and potential damage to the sensitive organic emission layers while still enabling effective light extraction.
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 solution improves light extraction efficiency by refracting and extracting limited light within the OLED panel, while maintaining packaging performance and preventing damage from water vapor and oxygen, ensuring the stability of the light extraction layer and internal organic film layers.
Implementation Method 1
About 80% of photons cannot escape into the air due to the influences of the reflection and refraction of the indium tin oxide (ITO), the glass substrate, and the various functional layers inside the OLED device
Implementation Method 2
a plurality of inorganic barrier layers, which are made of inorganic material and have good gas-barrier and gas-barrier properties
Data Source
AI summary
The present disclosure relates to an organic light-emitting diode (OLED) display panel, including: a substrate, an OLED array layer configured on the substrate, a thin film packaging layer configured on the substrate and the OLED array layer, and a light extraction layer configured within the thin film packaging layer. The OLED array layer includes a plurality of OLED components arranged in matrix. The thin film packaging layer includes at least two inorganic barrier layers and at least one organic buffer layer. One side of the inorganic barrier layer facing away the substrate includes a plurality of pixel grooves corresponding to tops of each of the OLED components. The light extraction layer is configured within the pixel grooves, and the light extraction layer is covered by a flattening film configured to seal the light extraction layer within the pixel grooves, so as to flatten a surface of the inorganic barrier layer.