OLED Pixel Arrangement Virtual Octagonal Cell
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Solution Overview
Problem
Current OLED pixel arrangement structures face limitations in achieving higher resolution and image quality due to the constraints of the FMM manufacturing process and coating process, leading to graininess in monochrome displaying and poor true color display effects.
Innovation Solution
An OLED pixel arrangement structure is introduced, where four adjacent first sub-pixels and four adjacent second sub-pixels are alternately arranged to form a virtual octagonal cell, with a third sub-pixel at the center, creating a basic pixel unit that overcomes the limitations of the FMM manufacturing and coating processes, thereby improving PPI and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub-pixels are alternately and repeatedly arranged to form pixel units, then the display structure is simple and manufacturing is easy, but the PPI value approaches a limit due to FMM manufacturing process constraints
Solution Approach 1:
The pixel arrangement is segmented into multiple types (first, second, third, fourth pixel units) with different sub-pixel compositions. This segmentation allows different regions to have optimized structures for resolution versus manufacturing ease, enabling higher overall PPI while maintaining manufacturability through modular design
Solution Approach 2:
The patent transitions from traditional linear alternating arrangements to a multi-dimensional grid structure with four types of pixel units. This dimensional expansion in the arrangement pattern allows more efficient space utilization and higher sub-pixel density without proportionally increasing manufacturing complexity
2Ease of manufacture
If sub-pixels of the same color are gathered together, then fewer FMM holes are needed for evaporation, but the distance between sub-pixels increases causing graininess in monochrome displaying
Solution Approach 1:
Different regions of the display are assigned different pixel unit types with locally optimized characteristics. Some regions use arrangements that favor manufacturing simplicity while others optimize for display smoothness, allowing both requirements to be satisfied in different parts of the overall display structure
Solution Approach 2:
The patent introduces asymmetric pixel unit configurations where the arrangement of sub-pixels varies by region rather than using a uniform symmetric pattern. This asymmetry allows optimization for both manufacturing ease and display quality without the constraints of regular repeating patterns
3Manufacturing precision
If pixels are formed by sharing sub-pixels of R and B or B and G, then high PPI is achieved, but the display effect for true colors becomes poor
Solution Approach 1:
The display is segmented into different pixel unit types, with some units containing all three primary colors (RGB) for accurate color representation, while others use shared sub-pixels for high PPI. This segmentation allows both color accuracy and high resolution to coexist in different regions
Solution Approach 2:
The pixel units are designed with multi-functionality, where certain sub-pixels can serve dual purposes in different contexts. The shared sub-pixel structure allows the same physical sub-pixel to contribute to both high PPI requirements and color accuracy requirements depending on the pixel unit configuration
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
This arrangement effectively enhances the image quality and display effect of OLEDs by improving the PPI value and resolution, allowing for clearer and more accurate color representation.
Implementation Method 1
small organic molecules are heated by an evaporation source, and are changed from an aggregation state to a gaseous state, to be deposited on a right above substrate
Implementation Method 2
The FMM has a pattern formed by a large number of meshes, such that in depositing sub-pixels of a color, other sub-pixels and non-coated regions between sub-pixels which do not require to be coated are sheltered
Data Source
AI summary
An OLED pixel arrangement structure includes multiple first sub-pixels, multiple second sub-pixels and multiple third sub-pixels. Four adjacent ones of the first sub-pixels and four adjacent ones of the second sub-pixels are alternately arranged and surround one of the third sub-pixels. Centers of the four adjacent first sub-pixels and centers of the four adjacent second sub-pixels form vertexes of a virtual octagonal cell, and the virtual octagonal cell has at least two orthogonal symmetry axes, a basic pixel unit is formed by the first sub-pixels and the second sub-pixels forming the virtual octagonal cell and a part of the third sub-pixel inside the virtual octagonal cell which are located on one side of one of the at least two orthogonal symmetry axes of the virtual octagonal cell. A center of the third sub-pixel coincides with a center of the virtual octagonal cell.