Pixel Arrangement Structure for AMOLED Aperture Ratio
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Solution Overview
Problem
The production of high-resolution organic light emitting diode (OLED) displays faces challenges due to the difficulty in manufacturing fine metal masks (FMM) with increased resolution, leading to color mixing and low aperture ratios, which restricts the brightness, service life, and yield of AMOLED products.
Innovation Solution
A pixel arrangement structure with periodically arranged pixel groups, each comprising four pixels, where the sub-pixel arrangements in diagonal positions are the same but differ in adjacent row and column directions, allowing for a larger opening area in the metal mask, thereby increasing the aperture ratio and light emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution is increased, then the image definition is improved, but the distance between emitting areas of sub-pixels must be smaller, causing color mixing phenomenon to become more serious
Solution Approach 1:
The patent uses asymmetric sub-pixel arrangements within pixels, where different pixels have different sub-pixel configurations (e.g., first pixel has sub-pixels at specific positions, second pixel has different positions). This asymmetry allows for better control of light emission patterns and reduces color mixing between adjacent sub-pixels while maintaining high resolution
Solution Approach 2:
The patent transitions from traditional linear stripe arrangements to a two-dimensional grid-based pixel arrangement with four pixels per group. This dimensional change allows for more flexible sub-pixel positioning and better control over light emission, reducing color mixing while maintaining high resolution
2Measurement precision
If the opening area of FMM is reduced to achieve smaller sub-pixel distances, then the resolution is improved, but the aperture ratio is reduced, affecting brightness and service life
Solution Approach 1:
The patent segments the display into groups of four pixels with different sub-pixel arrangements. This segmentation allows different regions to have optimized opening areas, with some pixels having larger openings for brightness and others having smaller openings for resolution, thereby increasing the overall average aperture ratio while maintaining high resolution
Solution Approach 2:
Different pixels within the same group have different local qualities in terms of sub-pixel arrangement and opening area. This allows each pixel to be optimized for its specific function, with some pixels prioritizing brightness and others prioritizing resolution, thereby increasing the overall aperture ratio while maintaining high resolution
3Measurement precision
If the opening area of FMM is reduced, then the resolution is improved, but the manufacturing difficulty of metal mask increases
Solution Approach 1:
The patent segments the mask design into repeating groups of four pixels with standardized sub-pixel arrangements. This segmentation simplifies the manufacturing process by allowing the same mask pattern to be repeated across the entire display, reducing the complexity of manufacturing high-resolution masks while maintaining high resolution
Data Source
AI summary
A pixel arrangement structure includes a plurality of pixel groups that are periodically arranged. Each pixel group includes four pixels, a first pixel (310) and a second pixel (320) are arranged in a same row, a third pixel (330) and a fourth pixel (340) are arranged in adjacent another row, the first pixel (310) and the third pixel (330) are arranged in a same column, and the second pixel (320) and the fourth pixel (340) are arranged in adjacent another column. An arrangement of sub-pixels in the first pixel (310) is different from an arrangement of sub-pixels in the second pixel (320), an arrangement of sub-pixels in the third pixel (330) is same as the arrangement of the sub-pixels in the second pixel (320), and an arrangement of sub-pixels in the fourth pixel (340) is same as the arrangement of the sub-pixels in the first pixel (310). The pixel arrangement structure allows the opening area of the metal mask for manufacturing the pixel arrangement structure to be larger, and therefore the aperture ratio is increased and the brightness, service life and image definition of the AMOLED product are improved. An organic light emitting device, a display device and a mask are also provided.