OLED Substrate Conductive Ink Cavity Length Control
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Solution Overview
Problem
The existing methods for fabricating microcavity structures in OLED display substrates are complicated, with limited precision and uniformity in adjusting cavity lengths, leading to restricted color purity and display quality due to the properties of ITO layers and the etching process.
Innovation Solution
The use of conductive ink with different thicknesses in sub-pixel regions, applied by printing, allows for easy control of cavity lengths in microcavity structures, improving color purity and simplifying the fabrication process by eliminating the need for complex etching and multiple deposition steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ITO layers and etching process are used to adjust cavity lengths, then microcavity structures can be formed, but the manufacturing precision and uniformity are limited
Solution Approach 1:
The patent changes the material parameter from ITO to conductive ink and adjusts the application method parameter from etching to printing. This allows precise control of cavity length through direct deposition of conductive ink layers with controlled thickness, eliminating the need for complex etching processes and achieving superior manufacturing precision and uniformity
Solution Approach 2:
The patent replaces the mechanical etching process with a printing-based deposition process. Instead of removing material through etching, the cavity length adjusting layers are directly formed by printing conductive ink, simplifying the fabrication process while improving precision and uniformity
2Manufacturing precision
If multiple deposition steps and etching are used, then cavity length adjustment is possible, but production time and cost increase
Solution Approach 1:
The patent performs the cavity length adjustment action in advance by directly printing conductive ink layers with the desired thickness during the manufacturing process. This eliminates the need for subsequent etching steps and multiple depositions, reducing production time while maintaining precise control over cavity length
Solution Approach 2:
The patent extracts and eliminates the time-consuming etching process and multiple deposition steps from the fabrication sequence. By using direct printing of conductive ink, the essential function of cavity length adjustment is achieved in a single step, significantly reducing production time
3Reliability
If ITO layers are used for cavity length adjustment, then conductive layers can be formed, but color purity and display quality are restricted
Solution Approach 1:
The patent changes the material parameter from ITO to conductive ink, which enables better control over cavity length and thus improves color purity. The printing method also simplifies the fabrication process by eliminating complex etching steps, simultaneously reducing device complexity while enhancing display quality
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 approach enhances the color gamut and display quality of OLED substrates by allowing precise control of cavity lengths, reducing production costs and time, and ensuring uniformity and flatness of the cavity length adjusting layers.
Implementation Method 1
The use of conductive ink with different thicknesses in sub-pixel regions, applied by printing, allows for easy control of cavity lengths in microcavity structures
Implementation Method 2
The light emitted by a light emitting layer is emitted out after travelling through an optical resonant cavity, which can perform multi-level reflection, total reflection, diffraction or scattering on the light
Implementation Method 3
The light emitted by a light emitting layer is emitted out after travelling through an optical resonant cavity, which can perform multi-level reflection, total reflection, diffraction or scattering on the light
Data Source
AI summary
The present disclosure provides an OLED display substrate including a substrate, a pixel defining layer on the substrate, for defining a plurality of sub-pixel regions having different colors; and cavity length adjusting layers in the sub-pixel regions, wherein the cavity length adjusting layers comprise a conductive ink, and the cavity length adjusting layers have different thicknesses in the sub-pixel regions having different colors.