Pixel Defining Layer for Uniform Ink-Jet Printing
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Solution Overview
Problem
Ink-jet printing technology faces challenges in forming organic thin films with uniform thickness in OLED devices due to variations in pixel unit sizes and distances, leading to inconsistent microenvironments for film formation.
Innovation Solution
A pixel defining layer with pixel defining patterns arranged in rows and columns, where adjacent openings in the same row have equal minimum distances and varying widths, ensuring a consistent microenvironment for uniform film formation by adjusting the centers of pixel units relative to their defining patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ink-jet printing technology is used to form organic thin films, then equipment cost is reduced and mass production capability is improved, but film thickness uniformity deteriorates due to variations in pixel unit sizes and distances
Solution Approach 1:
The pixel defining patterns are designed with locally varied dimensions - specifically, adjacent patterns in the same row have different widths (first width for red, second width for green, third width for blue) but maintain equal minimum distances between adjacent openings. This local variation in pattern geometry compensates for the inherent variations in ink-jet printing, creating a uniform microenvironment for film formation across different pixel regions while using cost-effective ink-jet printing equipment.
Solution Approach 2:
The invention changes the geometric parameters of the pixel defining patterns - specifically adjusting the widths of adjacent patterns in the same row to have different values. This parameter modification creates a compensated microenvironment that maintains uniform film thickness despite using ink-jet printing technology, thereby resolving the contradiction between low equipment cost and high film uniformity.
2Manufacturing precision
If vacuum evaporation method is used, then film uniformity is improved, but equipment investment increases and material utilization decreases
Solution Approach 1:
Instead of requiring expensive vacuum evaporation equipment to achieve uniform films, the invention modifies the local geometry of pixel defining patterns - adjacent patterns in the same row have different widths but equal minimum distances between openings. This local structural optimization creates a uniform microenvironment that enables ink-jet printing to achieve film uniformity comparable to vacuum evaporation, while avoiding high equipment investment.
Solution Approach 2:
The invention changes the geometric parameters of pixel defining patterns to compensate for ink-jet printing limitations. By setting different widths for adjacent patterns (first width < second width < third width for red, green, blue respectively) while maintaining equal minimum distances, the parameter modification creates optimal conditions for uniform film formation using low-cost ink-jet printing equipment.
3Device complexity
If pixel defining patterns with equal sized openings are used, then manufacturing simplicity is improved, but film formation uniformity deteriorates due to inconsistent microenvironments
Solution Approach 1:
The invention applies local quality by designing pixel defining patterns where adjacent patterns in the same row have different widths tailored to their specific positions and color requirements. The red pixel defining pattern has a first width, green has a second width, and blue has a third width, with first < second < third. This local differentiation creates consistent microenvironments for film formation across all pixel regions, resolving the contradiction between design simplicity and film uniformity.
Solution Approach 2:
The invention introduces asymmetry in the pixel defining patterns - adjacent patterns in the same row are intentionally designed with different widths rather than equal sizes. This asymmetric design, where each pattern's width is optimized for its specific position and color, creates uniform microenvironments for film formation while maintaining relatively simple manufacturing processes.
Data Source
AI summary
A pixel defining layer, a pixel structure, a display panel and a display device are provided. The pixel defining layer includes: a plurality of pixel defining patterns arranged in a row direction and a column direction, each of the pixel defining patterns having an opening. In the row direction, the openings in at least two adjacent pixel defining patterns have different sizes in the row direction, and adjacent openings of the pixel defining patterns in the same row have equal minimum distances (a, b, c) in the row direction.