Inkjet Printing Nozzle Sequencing for Display Stain Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing methods for display devices, such as organic light-emitting diode displays, often result in uneven ink distribution due to randomly set nozzle combinations, leading to stains and deteriorated display quality.
Innovation Solution
An inkjet printing method that sequences nozzle combinations for each pixel in a pixel matrix, ensuring a uniform spatial frequency and matching ink volumes, thereby preventing stains like dot Mura or line Mura by setting nozzle combinations based on specific sequence numbers and combination numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nozzle combinations are randomly set for each pixel, then the manufacturing process is simple, but stains occur and display quality deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying nozzle combination parameters according to a predefined sequence pattern. Instead of random nozzle assignment, the system changes nozzle combination parameters in a controlled manner based on pixel position and sequence number, ensuring uniform ink distribution while maintaining manufacturing simplicity
Solution Approach 2:
The patent implements periodic action through the use of a sequence pattern that repeats nozzle combination assignments in a systematic cycle. The sequence number increments periodically across the pixel matrix, creating a regular pattern of nozzle assignments that prevents stain formation while simplifying the manufacturing process
2Manufacturing precision
If nozzle combinations are set according to a sequence with uniform spatial frequency, then display quality improves and stains are prevented, but the process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the pixel matrix into regions with different sequence number ranges. Each region uses a specific nozzle combination sequence, allowing complex display quality requirements to be met through localized pattern application rather than requiring a completely complex global system
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing the sequence of sequence numbers before the actual inkjet printing process. This preprocessing step creates a lookup table or predefined pattern that simplifies the real-time manufacturing process while ensuring high display quality through controlled spatial frequency distribution
Data Source
AI summary
An inkjet printing method includes forming a sequence of sequence numbers corresponding to a pixel matrix including pixels arranged in X rows and Y columns (where X and Y are respective natural numbers), setting nozzle combinations for the pixels, respectively, according to the sequence, and discharging ink to the pixels using respective combinations of nozzles respectively corresponding to the nozzle combinations for the pixels.