Ring-Shaped Sub-Pixel Display Substrate for High PPI OLED Fabrication
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Solution Overview
Problem
The precision limitations of high-precision metal mask plates hinder the improvement of Pixels Per Inch (PPI) and resolution in OLED products, particularly in displaying fine content like small fonts, due to the difficulty in fabricating smaller pixel sizes and maintaining image clarity.
Innovation Solution
A display substrate design featuring pixel unit groups with a block-shaped first-color sub-pixel unit surrounded by ring-shaped second and third-color sub-pixel units, allowing for improved resolution and PPI by adjusting the size and arrangement of sub-pixel units, and using an etching process to fabricate small anodes independent of each other, which are not restricted by the precision of the metal mask plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel size is reduced to improve PPI and resolution, then the display quality for fine content is improved, but the manufacturing precision of the metal mask plate becomes insufficient
Solution Approach 1:
The pixel structure is segmented into a central sub-pixel and surrounding ring-shaped sub-pixels. This segmentation allows the mask plate to have larger opening sizes for the ring-shaped sub-pixels while still achieving high PPI through the segmented arrangement, thereby resolving the contradiction between small pixel size and mask plate manufacturing precision
Solution Approach 2:
The invention transitions from traditional planar pixel arrangements to a multi-dimensional structure with central and ring-shaped sub-pixels. This dimensional change enables more efficient space utilization and allows the mask plate to maintain adequate opening sizes while achieving higher PPI through the vertical stacking of sub-pixel layers
2Manufacturing precision
If the mask plate opening size is reduced to achieve smaller pixels, then the PPI is improved, but the ease of manufacture of the mask plate deteriorates
Solution Approach 1:
By segmenting the pixel into central and ring-shaped sub-pixels, the mask plate can have larger, more manufacturable openings for each sub-pixel type while achieving high PPI through the segmented arrangement. The ring-shaped openings are particularly easier to manufacture than solid circular openings of equivalent area
Solution Approach 2:
Different regions of the pixel structure have different qualities - the central sub-pixel uses one mask opening pattern while the ring-shaped sub-pixels use another. This local differentiation allows optimization of mask plate fabrication for each region, making the overall manufacturing process more feasible
Data Source
AI summary
A display substrate is provided. The display substrate includes: a plurality of pixel unit groups arranged in rows, each of the pixel unit groups including: a first-color sub-pixel unit, and a ring-shaped second-color sub-pixel unit surrounding the first-color sub-pixel unit.