OLED Pixel Structure Using Segmented Triangular Sub-pixels
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Solution Overview
Problem
Existing OLED pixel arrangements face challenges with small dot pitch between sub-pixels, difficulty in fabricating fine metal masks, and complications in the evaporation process, particularly affecting higher resolution displays and font clarity.
Innovation Solution
The OLED pixel structure incorporates pixel groups with predetermined shapes, including first, second, and third sub-pixels of different areas and shapes, such as isosceles triangles and right-angled trapezoids, distributed in specific patterns within rectangular pixel groups, using different or same metal masks for fabrication and filling with an organic layer made of polyamide or acrylic, allowing for equal sub-pixel areas across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dot pitch between adjacent sub-pixels is reduced to increase pixel density, then the resolution is improved, but the fabrication difficulty of fine metal masks increases significantly
Solution Approach 1:
The invention divides each pixel into three separate sub-pixels (red, green, blue) arranged in a specific geometric pattern, allowing the use of three separate metal masks instead of one extremely fine mask. This segmentation approach enables the fabrication process to work with larger, more manageable mask features while achieving high overall pixel density through the compact triangular arrangement.
Solution Approach 2:
The invention transitions from a linear or grid-based pixel arrangement to a two-dimensional triangular lattice arrangement. By organizing sub-pixels in equilateral triangles with specific geometric relationships, the design increases pixel density in both horizontal and vertical dimensions simultaneously, achieving higher resolution without proportionally increasing the difficulty of mask fabrication in any single direction.
2Measurement precision
If the dot pitch between adjacent sub-pixels is reduced to increase pixel density, then the resolution is improved, but the evaporation process becomes more difficult
Solution Approach 1:
The evaporation process is segmented into three separate deposition steps, each corresponding to one color channel (red, green, blue). This allows the use of standard evaporation equipment and processes for each color layer independently, avoiding the need for a single complex evaporation process that would be required to deposit all three colors simultaneously at high resolution.
Solution Approach 2:
The invention performs preliminary patterning of the substrate with the three-color pixel arrangement before the evaporation process. By pre-defining the pixel geometry and sub-pixel locations through photolithography or other patterning techniques, the subsequent evaporation process becomes simpler, requiring only material deposition rather than simultaneous complex patterning and deposition.
3Measurement precision
If smaller sub-pixels are used to increase pixel density, then the resolution is improved, but the picture distortion and jagged edge effects worsen
Solution Approach 1:
The invention assigns different geometric shapes to different sub-pixel positions within the pixel array. Corner pixels use triangular sub-pixels, while edge and center pixels use appropriately shaped sub-pixels that match their local geometric environment. This local optimization ensures that all pixels contribute equally to image quality without introducing distortion or jagged artifacts at boundaries.
Solution Approach 2:
The invention employs asymmetric triangular arrangements of sub-pixels within each pixel, with specific orientation and positioning that optimizes the overall pixel lattice. The asymmetric geometry of individual sub-pixels, when arranged in the specific triangular pattern described, creates a more uniform effective pixel shape at the macro level, reducing the perception of jagged edges and distortion while maintaining high density.
Data Source
AI summary
The present invention provides an organic light-emitting diode (OLED) pixel structure, including: a plurality of pixel groups having predetermined shapes that constitute a pixel layer, one of the pixel groups having predetermined shapes including at least two pixels of R, G, and B pixels and no common sub-pixel, each of the pixels including three sub-pixels having different areas, and areas of same sub-pixels in different pixels in one of the pixel groups having predetermined shapes are equal.