OLED Pixel Arrangement Structure for High Resolution
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Solution Overview
Problem
Conventional OLED pixel arrangement structures face difficulties in achieving high resolution and high luminance due to limitations in depositing organic materials with metal masks and a compromise between luminance and service life, with issues like vision crosstalk and Moiré effects in higher efficiency PenTile structures.
Innovation Solution
The pixel arrangement structure groups red, green, and blue subpixels into subpixel groups, with these groups spaced to form pixels, increasing the aperture ratio of metal masks or allowing smaller subpixels for higher resolution, and sharing subpixels between adjacent pixels to reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pixel arrangement structures are used, then the structure is simple and easy to manufacture, but the resolution cannot exceed 300 PPI and the aperture ratio is low
Solution Approach 1:
The invention divides the display area into multiple types of pixel units (first pixel units with four subpixels, second pixel units with three subpixels, third pixel units with two subpixels). This segmentation allows different pixel configurations to be combined, achieving high resolution above 300 PPI while maintaining manufacturability through modular design.
Solution Approach 2:
Different regions of the display use different pixel configurations tailored to local requirements. First pixel units with four subpixels provide high luminance where needed, while second and third pixel units with fewer subpixels optimize for resolution and aperture ratio in other areas, achieving local optimization of display performance.
2Illumination intensity
If the aperture ratio is increased to improve luminance, then the luminance increases, but the service life decreases due to large current density
Solution Approach 1:
The display is divided into multiple pixel unit types with different aperture ratios. First pixel units with four subpixels provide high luminance when needed, while second and third pixel units with fewer subpixels have lower current density and longer service life. This segmentation allows the system to balance luminance output with longevity by distributing workload across different pixel types.
Solution Approach 2:
The patent implements dynamic control of different pixel units based on their characteristics. First pixel units with higher luminance capability are activated when brightness is needed, while second and third pixel units with better reliability are used when lower brightness suffices. This dynamic switching optimizes the balance between luminance and service life during operation.
3Productivity
If PenTile pixel arrangement structure is used to improve efficiency, then the luminance efficiency increases, but vision crosstalk, Moiré effect, and zigzag problems occur
Solution Approach 1:
The invention segments the display into multiple pixel unit types with different subpixel compositions rather than using a uniform PenTile structure. First pixel units with four subpixels provide complete color information, while second and third pixel units with fewer subpixels are strategically placed. This segmentation reduces the harmful effects of PenTile arrangements like vision crosstalk and Moiré effects while maintaining luminance efficiency.
Solution Approach 2:
Different pixel configurations are placed in different locations based on local display requirements. First pixel units with four subpixels are positioned where complete color accuracy is needed, while second and third pixel units are placed in areas where slight color compromise is acceptable in exchange for higher efficiency. This local optimization reduces visible artifacts while maintaining overall efficiency.
4Manufacturing precision
If metal masks are used to deposit organic materials in conventional structures, then the manufacturing process is established, but the aperture ratio of metal masks becomes a limiting factor for resolution
Solution Approach 1:
The display is divided into multiple pixel unit types with different subpixel counts and arrangements. This segmentation allows the metal mask design to serve multiple functions: depositing materials for high-resolution regions (first pixel units) and optimized-aperture regions (second and third pixel units). The segmented approach enables resolution above 300 PPI while maintaining reasonable metal mask aperture ratios by not requiring uniformly high aperture across the entire display.
Data Source
AI summary
A pixel arrangement structure for an organic light-emitting diode includes a plurality of red subpixel groups, a plurality of green subpixel groups, and a plurality of blue subpixel groups. Each red subpixel group is comprised of a plurality of red subpixels. Each green subpixel group is comprised of a plurality of green subpixels. Each blue subpixel group is comprised of a plurality of blue subpixels. The red subpixel groups, the green subpixel groups, and the blue subpixel groups are spaced from each other. One of the red subpixels of the red subpixel groups, one of the green subpixels of the green subpixel groups, and one of the blue subpixels of the blue subpixel groups, which are adjacent to each other, together form a pixel. The subpixels of the same color are gathered to form a subpixel group to increase the aperture ratio of metal masks.