Array Substrate Groove Layout for High-Resolution Inkjet Printing
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Solution Overview
Problem
Conventional inkjet printing technology faces challenges in achieving high-resolution printing for small and medium-sized displays due to limitations in ink droplet volume and printing accuracy, leading to instability and difficulty in controlling nozzle operations for high pixel density.
Innovation Solution
A double-layer structure for pixel defining layers with alternating first and second grooves allows direct deposition of light-emitting materials into these grooves, connecting multiple pixel regions simultaneously, thereby improving print resolution and simplifying the operation of inkjet printing equipment without extensive modifications to existing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing technology is used for high-resolution printing, then printing accuracy can be improved, but the complexity of controlling nozzle operations increases and stability deteriorates
Solution Approach 1:
The pixel defining layer is segmented into multiple layers (first pixel defining layer and second pixel defining layer), with each layer containing specific groove patterns. This segmentation allows the printing process to be divided into separate steps for forming different groove types, simplifying the control of nozzle operations for each step while achieving high overall printing precision.
Solution Approach 2:
The invention introduces a vertical dimension by creating a multi-layer pixel defining structure. The first pixel defining layer forms initial grooves, and the second pixel defining layer adds additional grooves at different heights and positions. This dimensional approach enables complex pixel region definitions that would be difficult to achieve with a single-layer structure, while maintaining manageable nozzle control through staged printing.
2Device complexity
If conventional single-layer pixel defining structure is used, then device complexity is low, but printing resolution deteriorates due to limitations in ink droplet volume and printing accuracy
Solution Approach 1:
The pixel defining layer is divided into multiple segments (first and second pixel defining layers), each contributing to the overall pixel region definition. The first layer creates initial grooves that can be filled with light-emitting materials, while the second layer adds additional grooves for further material deposition. This segmentation enables higher printing resolution by distributing the complex patterning across multiple simpler printing steps.
Solution Approach 2:
The first pixel defining layer is formed in advance to create initial grooves and define basic pixel region boundaries. This preliminary structure provides a foundation for the second pixel defining layer, which then adds additional detail and refinement. By performing preliminary actions in staged steps, the invention achieves high printing resolution without requiring all features to be printed in a single complex operation.
3Area of stationary object
If multiple nozzles are used to form light-emitting layers in adjacent rows, then printing coverage is improved, but the number of nozzles required increases and material waste increases
Solution Approach 1:
The first and second pixel defining layers are combined to create a unified multi-layer structure that defines pixel regions across adjacent rows. The grooves in both layers work together to create a comprehensive pattern that can be filled with light-emitting materials. This merging approach allows a single nozzle or limited number of nozzles to service multiple pixel rows by printing across the entire width in each layer, reducing the total number of nozzles needed while maintaining extensive printing coverage.
Data Source
AI summary
The present disclosure generally relates to the field of display technology, and in particular, to an array substrate, a method of fabricating the array substrate, a display panel including the array substrate, and a method of fabricating the display panel. An array substrate includes: a base substrate; an electrode layer provided on the substrate; a first pixel defining layer on the electrode layer defining a plurality of pixel regions; and a second pixel defining layer on the first pixel defining layer, wherein the second pixel defining layer has a plurality of first grooves and a plurality of second grooves alternately arranged between two adjacent rows of pixel regions.