OLED Pixel Structure for Resolution and Lifespan Balance
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Solution Overview
Problem
Current OLED display technologies face challenges in balancing the lifespan of red, green, and blue sub-pixels due to material limitations and pixel arrangement, which affects the display's resolution and performance as resolution increases.
Innovation Solution
A pixel structure is proposed with repeated units arranged in an array, where one sub-pixel of a first color is surrounded by two sub-pixels of a second and third color, with the sub-pixel of maximum brightness divided into secondary sub-pixels, allowing for improved resolution and lifespan balance through sharing and efficient evaporation mask usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pixel arrangement is used, then manufacturing process is simple, but resolution is limited and material lifespans are unbalanced
Solution Approach 1:
The pixel structure is divided into repeated units, each containing multiple sub-pixels of different colors arranged in a specific pattern. This segmentation allows for higher resolution by increasing the number of sub-pixels per inch while maintaining a manageable manufacturing process through modular repetition of the basic unit structure.
Solution Approach 2:
Different colors of sub-pixels are strategically positioned within each repeated unit based on their material lifespan characteristics and brightness requirements. Sub-pixels with longer lifespans and higher brightness can occupy larger or more central positions, while balancing the overall distribution to achieve uniform display quality across the panel.
2Reliability
If blue sub-pixels use fluorescent materials and red/green use phosphorescent materials, then color display is achieved, but luminescence lifespans are unbalanced with blue having the shortest lifespan
Solution Approach 1:
The patent applies different material types to different color sub-pixels based on their specific lifespan and brightness characteristics. Red and green sub-pixels use phosphorescent materials with longer lifespans, while blue sub-pixels use fluorescent materials. The arrangement compensates for the shorter blue lifespan by optimizing their positioning and quantity within repeated units to achieve overall display longevity.
Solution Approach 2:
The patent changes the material parameters (fluorescent vs. phosphorescent) for different color sub-pixels to optimize both display quality and lifespan. By selecting materials with appropriate luminescence characteristics for each color, the system achieves a balance where the overall display service life is extended despite inherent material limitations.
3Manufacturing precision
If more sub-pixels are arranged per inch, then resolution is improved, but pixel arrangement complexity increases affecting manufacturing
Solution Approach 1:
The high-resolution pixel array is segmented into repeated units that can be manufactured using standard evaporation mask techniques. Each repeated unit contains a specific arrangement of sub-pixels that can be deposited in a single mask layer, avoiding the need for excessively complex multi-layer masks while achieving high overall resolution through the repetition and density of these modular units.
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 configuration enhances the display's resolution by increasing the number of sub-pixels per inch, balances the lifespan of different material sub-pixels, and enables uniform pixel arrangement, improving overall display performance and supporting VR and 3D capabilities.
Implementation Method 1
The pixels generally form an organic electroluminescent structure through organic materials penetrating a Fine Metal Mask (FMM) at the positions corresponding to pixel positions of an array substrate by using evaporation film forming technology
Implementation Method 2
three different kinds of organic materials are respectively evaporated for the light-emitting sub-pixels of the three primary colours, i.e. red, green and blue, at corresponding positions through the FMM during the manufacturing process
Data Source
AI summary
Disclosed are a pixel structure and a display apparatus. The pixel structure includes a number of repeated units arranged in an array. Each repeated unit comprises one sub-pixel of a first color, two sub-pixels of a second color, and two sub-pixels of a third color. The first color, the second color, and the third color are different from one another, and on each side of the sub-pixel of the first color is arranged with one of the sub-pixels of the second color and one of the sub-pixels of the third color.