OLED Pixel Defining Layer Layout for Uniform Inkjet Film Formation
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Solution Overview
Problem
Existing film forming methods for OLEDs, particularly in solution processes, face challenges with high material costs and low utilization rates, leading to increased product development costs, and issues with uniformity and consistency in high-resolution displays due to limitations in inkjet printing technology.
Innovation Solution
A display panel design featuring a planarization layer with criss-cross arranged lyophilic and lyophobic areas, including grooves for lyophilic pixel defining layers, which enhances the process window and improves ink circulation, resulting in uniform film thickness and reduced display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If inkjet printing is used for OLED film formation, then material utilization rate improves, but uniformity and consistency of high-resolution displays deteriorates
Solution Approach 1:
The pixel defining layer is segmented into multiple thickness regions: a first thickness region (thinner) and a second thickness region (thicker). This segmentation allows different areas to serve different functions - the thinner region facilitates inkjet printing material utilization while the thicker region ensures uniformity and consistency for high-resolution display requirements
Solution Approach 2:
Different regions of the pixel defining layer are assigned different thicknesses and properties. The first thickness region has optimized thickness for material utilization in inkjet printing, while the second thickness region provides enhanced uniformity and consistency. This local differentiation resolves the contradiction by allowing each region to optimize for its specific function
2Manufacturing precision
If evaporation technology is used for OLED film formation, then manufacturing precision improves, but material cost and device complexity increases
Solution Approach 1:
The pixel defining layer is divided into multiple thickness regions that can be formed through different processes. The first thickness region can be formed by evaporation technology for high precision, while the second thickness region can be formed by solution process for cost-effectiveness, thereby reducing overall device complexity
Solution Approach 2:
The pixel defining layer uses a composite structure combining materials or processes with different characteristics. This allows integration of evaporation-formed regions (high precision) with solution-process-formed regions (lower cost, simpler equipment), resolving the contradiction between manufacturing precision and device complexity
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 design ensures smoother ink circulation, reduces overflow and color crosstalk, and enhances display quality by maintaining consistent ink volumes across sub-pixels, thereby improving the uniformity and stability of high-resolution displays.
Implementation Method 1
the pixel defining layer is provided with a pixel defining layer setting area, and the pixel defining layer setting area includes a lyophilic area and a lyophobic area, wherein the lyophilic area and the lyophobic area are criss-cross arranged
Data Source
AI summary
A display panel, a display apparatus and a method for manufacturing the display panel, which is related to the technical field of display. Including a back plate, wherein a planarization layer is arranged on the back plate; and the planarization layer is provided with a pixel defining layer setting area, and the pixel defining layer setting area includes a lyophilic area and a lyophobic area, wherein the lyophilic area and the lyophobic area are criss-cross arranged; the planarization layer is provided with a groove at a position where the lyophilic area is located; the groove is provided with a lyophilic pixel defining layer; and the lyophobic area is provided with a lyophobic pixel defining layer.