OLED Subpixel Tetragon Layout for Simpler Mask Deposition
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Solution Overview
Problem
Current OLED display fabrication processes face challenges in achieving high-resolution products due to the complexity and difficulty in designing high-precision metal masks, which affect the aperture ratio and lead to issues like cross-color deviation and increased fabrication difficulties.
Innovation Solution
A pixel structure comprising first, second, and third sub-pixels arranged within a virtual tetragon, where sub-pixels of the same type share openings in the metal mask for vapor deposition, reducing spacing and position deviations, and incorporating isolating grooves or rods to manage vapor deposition, thereby increasing the pixel aperture ratio and simplifying mask fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional high-precision metal masks are used for vapor deposition, then the organic material can be deposited with controlled area and shape, but the mask design becomes extremely complex and difficult, reducing manufacturing precision and increasing fabrication difficulties
Solution Approach 1:
The patent segments the pixel structure into three types of subpixels (first, second, and third subpixels) arranged in a specific tetragonal pattern. This segmentation allows each subpixel type to share common mask openings during vapor deposition, thereby simplifying the mask design while maintaining precise control over organic material deposition areas and shapes.
Solution Approach 2:
The patent merges the function of multiple mask openings by designing the pixel structure so that multiple subpixel types share the same mask opening. This merging approach reduces the total number of mask openings required, simplifying the high-precision metal mask design and fabrication while improving the aperture ratio.
2Ease of manufacture
If subpixels are arranged in conventional patterns, then fabrication is simpler, but cross-color deviation occurs and aperture ratio is reduced
Solution Approach 1:
The patent employs an asymmetric tetragonal arrangement of subpixels with specific positioning rules: first subpixels at midpoints of tetragon sides, second subpixels at interior angles, and third subpixels at specific interior angles of divided tetragons. This asymmetric configuration eliminates cross-color deviation by ensuring proper alignment of different colored subpixels while maintaining fabrication simplicity through the regular tetragonal pattern.
3Manufacturing precision
If more subpixel openings are provided in the metal mask, then better control of organic material deposition is achieved, but the fabrication difficulty and cost increase significantly
Solution Approach 1:
The patent makes mask openings universal by designing them to serve multiple subpixel types simultaneously. Each mask opening is positioned and sized to deposit organic material for multiple different subpixel types, allowing a single opening to perform multiple deposition functions. This multi-functionality reduces the total number of mask openings required while maintaining precise deposition control.
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 structure enhances the pixel aperture ratio to above 30%, reduces fabrication difficulties, and extends the life of the display device by optimizing the arrangement and shape of sub-pixels, particularly improving the RGB area ratio and reducing granular sensations.
Implementation Method 1
for the vapor deposition of an organic material by using a vacuum evaporation process
Data Source
AI summary
The present disclosure provides a pixel structure, a displaying substrate, a displaying device and a displaying method, wherein the pixel structure includes first sub-pixels, second sub-pixels and third sub-pixels that are located within a first virtual tetragon; the first sub-pixels are located individually adjacent to midpoints of four side edges of the first virtual tetragon; the second sub-pixels are located individually at four interior angles of the first virtual tetragon; and two center lines of the first virtual tetragon delimit the first virtual tetragon into four second virtual tetragons, and the third sub-pixels are located individually at first interior angles within the four second virtual tetragons.