OLED Metal Reflective Layer UV Decomposition of Photoresist Residues
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Solution Overview
Problem
Residual photoresist on the surface of a transparent conductive film in OLED display devices causes leakage current and deteriorated device characteristics due to incomplete cleaning during the exposure and development process of the pixel defining layer.
Innovation Solution
A light emitting layer structure with a substrate, pixel defining layer, and a reflective electrode comprising a first and second transparent charge injection layer, where the metal reflective layer is positioned under the second charge injection layer to facilitate ultraviolet irradiation and decompose organic residues, maintaining hydrophobicity and preventing ink overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic photoresist is used for pixel defining layer preparation, then the pixel defining layer can be formed with hydrophobicity, but residual photoresist remains on the transparent conductive film surface causing leakage current
Solution Approach 1:
A metal reflective layer is deposited on the transparent conductive film before forming the pixel defining layer. This preliminary structure serves as a substrate for subsequent ultraviolet irradiation to decompose and remove photoresist residues, preventing them from contaminating the final device structure.
Solution Approach 2:
The patent utilizes ultraviolet irradiation to convert the harmful photoresist residues into removable decomposition products. The metal reflective layer enhances this process by reflecting ultraviolet light back onto the photoresist residues, ensuring complete decomposition and removal, thereby eliminating the leakage current problem.
2Manufacturing precision
If ultraviolet irradiation is applied to remove photoresist residue, then cleaning effectiveness improves, but energy consumption increases
Solution Approach 1:
The metal reflective layer is utilized to reflect ultraviolet light back onto the photoresist residues, converting what would be wasted reflected energy into useful irradiation. This doubles the effective ultraviolet exposure, improving decomposition efficiency while maintaining reasonable energy consumption levels.
Solution Approach 2:
The metal reflective layer serves multiple functions: it acts as an electrode in the OLED structure, provides structural support, and simultaneously functions as a light reflector to enhance photoresist decomposition during cleaning, reducing the overall energy required for the process.
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 effectively removes residual photoresist and improves ink spreadability, reducing leakage current and maintaining device performance by ensuring complete cleaning and hydrophobicity of the pixel defining layer.
Implementation Method 1
facilitate ultraviolet irradiation and decompose organic residues
Implementation Method 2
metal reflective layer is positioned under the second charge injection layer to facilitate ultraviolet irradiation
Implementation Method 3
make the surface of the pixel defining layer have basic hydrophobicity, and the ink can be confined within the pixel defining layer
Data Source
AI summary
The present invention provides a light emitting layer structure and a display device, the light emitting layer structure includes a first charge injection layer disposed on the substrate and located in the pixel opening region; a metal reflective layer disposed on the first charge injection layer; the beneficial effects of the present invention is that in the light-emitting layer structure and display device of the present invention, the lengthwise direction of the metal reflective layer is longer than the lengthwise direction of the pixel opening region, can perform secondary irradiation to decompose the organic impurities remaining at the short arc-shape side and improve spreadability of the ink.