Display Panel Pixel Layout to Prevent Lateral Suji Mura
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Solution Overview
Problem
Ink jet printing methods for display panels with organic light-emitting devices face challenges in ensuring consistent display effects due to variations in ink output and thickness differences of functional layers, leading to lateral Suji Mura defects.
Innovation Solution
The display panel design includes pixel unit groups with sub-pixels of the same color arranged in a specific direction and connected, allowing for increased ink output precision and reduced thickness differences by staggering pixel unit groups and using a bridge structure, which reduces the impact of nozzle precision and ink distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ink jet printing is used to form functional layers of sub-pixels, then material utilization rate is improved and equipment investment cost is reduced, but thickness differences in functional layers occur leading to lateral Mura defects
Solution Approach 1:
The patent divides the array of sub-pixels with the same color into multiple groups arranged in parallel. By forming functional layers in different groups separately through ink jet printing, the thickness differences caused by nozzle precision limitations are dispersed and cannot form continuous lateral Mura, thus resolving the contradiction between using cost-effective ink jet printing and achieving uniform functional layer thickness.
2Area of stationary object
If sub-pixels are arranged in a conventional continuous array, then display coverage is maximized, but thickness differences in functional layers create visible lateral Mura defects
Solution Approach 1:
The patent segments the continuous array of sub-pixels into multiple parallel groups with at least one gap between adjacent groups. This segmentation disrupts the continuity required for lateral Mura formation while preserving overall display coverage, thus resolving the contradiction between maximizing display area and preventing visible Mura defects.
Solution Approach 2:
The patent introduces gaps between adjacent groups of sub-pixels, creating local variations in the display structure. These gaps prevent the propagation of thickness differences across the entire display area, thereby eliminating lateral Mura while maintaining adequate display coverage through the parallel arrangement of multiple groups.
3Manufacturing precision
If high precision ink output is required for each nozzle, then functional layer thickness uniformity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent divides sub-pixels into multiple parallel groups that are printed separately. This allows each nozzle to operate within a limited range with relaxed precision requirements, as thickness variations in one group do not propagate to adjacent groups. The segmentation thus reduces the complexity of maintaining high ink output precision while still achieving acceptable overall uniformity.
Data Source
AI summary
The present invention provides a display panel and a preparation therefor. The display panel at least includes a plurality of pixel unit groups, each of the pixel unit groups includes a plurality of pixel units, each of the pixel units includes a plurality of sub-pixels, and each of the sub-pixels has a functional layer. For the display panel provided by the present invention, the functional layers of multiple sub-pixels with a same color of the plurality of sub-pixels in each of the pixel unit groups are arranged in a first direction and connected with each other, which reduces precision requirements for ink output of each nozzle during an ink jet printing process and reduces a thickness difference of the functional layers of each column of the sub-pixels arranged in a printing direction, thereby effectively preventing generation of lateral Suji Mura during display of the display panel.