OLED Mask Design for High-Resolution Pixel Arrangement
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Solution Overview
Problem
The precision of metal masks used in small molecule evaporation for OLED display fabrication affects the quality and pixel resolution of organic luminescent displays, as the design of these masks is not optimized for the arrangement of sub-pixels, leading to suboptimal pixel arrangement and resolution.
Innovation Solution
A pixel arrangement structure with repeatedly arranged groups of sub-pixels, where each group includes specific overlapping patterns of first, second, and third sub-pixels in alternating columns, and a set of masks with corresponding metal frames and openings to vapor-deposit organic luminescent materials, allowing for higher pixel resolution and improved mask precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional metal masks with conventional opening designs are used for small molecule evaporation, then the fabrication process is simple, but the pixel resolution and display quality are limited due to suboptimal sub-pixel arrangement
Solution Approach 1:
The mask opening is divided into multiple independent sub-openings, each corresponding to a specific sub-pixel type (first, second, or third sub-pixel). This segmentation allows precise control over the deposition of organic luminescent materials for different sub-pixels, enabling higher pixel resolution by accurately defining the arrangement and boundaries of multiple sub-pixels within each pixel unit.
Solution Approach 2:
Different regions of the mask opening are designed with different local characteristics - each sub-opening has specific dimensions, shapes, and positions optimized for its corresponding sub-pixel type. The mask structure includes varying opening sizes and configurations in different local areas to match the specific requirements of first, second, and third sub-pixels, thereby achieving optimal pixel resolution and display quality.
2Manufacturing precision
If metal masks with high precision are used to achieve high pixel resolution, then the display quality improves, but the fabrication cost increases due to the need for extremely precise mask manufacturing
Solution Approach 1:
The mask design incorporates sub-openings with dimensions and positions that provide sufficient precision for high-resolution display fabrication without requiring ultra-precise mask manufacturing. By carefully designing the sub-opening configurations to match the sub-pixel arrangement, the system achieves the necessary pixel resolution with masks that are easier and less costly to manufacture than traditional high-precision masks would require.
3Adaptability or versatility
If conventional pixel arrangements are used, then the mask design is straightforward, but pixel borrowing and sub-pixel rendering are limited, reducing display quality
Solution Approach 1:
Each pixel is segmented into multiple independently controllable sub-pixels (first, second, and third sub-pixels) with distinct sub-openings in the mask. This segmentation enables flexible pixel borrowing arrangements where sub-pixels can be selectively activated or combined to achieve enhanced rendering effects, improving adaptability for various display modes and algorithms.
Solution Approach 2:
The sub-pixel arrangement extends beyond traditional single-row configurations by positioning sub-pixels in multiple rows and columns with specific overlapping relationships. This multi-dimensional arrangement enables more complex pixel borrowing patterns and sub-pixel rendering algorithms, allowing sub-pixels to serve multiple functions and improving overall display versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed pixel arrangement structure and mask design enhance pixel resolution and facilitate 'pixel borrowing' for sub-pixel rendering, while enabling the fabrication of high-resolution organic luminescent displays with lower precision masks, reducing fabrication costs.
Implementation Method 1
Small molecule evaporation using a fine metal mask (FMM) is widely used to fabricate OLED displays
Implementation Method 2
Small molecule evaporation using a fine metal mask (FMM) is widely used to fabricate OLED displays
Data Source
AI summary
A pixel arrangement structure is disclosed including a plurality of repeatedly arranged groups of sub-pixels. Each group of sub-pixels includes: one first sub-pixel and two second sub-pixels sequentially arranged in an i-th column, i being a natural number; two third sub-pixels and one first sub-pixel sequentially arranged in an (i+1)-th column; two second sub-pixels and one first sub-pixel sequentially arranged in an (i+2)-th column; and one first sub-pixel and two third pixels sequentially arranged in an (i+3)-th column. Also disclosed is a display panel including pixels arranged in accordance with the pixel arrangement structure, a display device including the display panel, and a set of masks for vapor-depositing an organic luminescent material in fabricating an organic luminescent display panel.