Divided Tetragon Subpixel Layout for Mask-Tolerant OLED Pixels
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Solution Overview
Problem
Conventional OLED display fabrication processes face challenges in achieving high-resolution and high-aperture ratios due to the complexity of high-precision metal masks and potential position deviations during vapor deposition, leading to reduced efficiency and increased fabrication difficulty.
Innovation Solution
A novel pixel structure is introduced, featuring sub-pixels arranged within a virtual tetragon, with specific symmetrical and complementary shapes, allowing neighboring sub-pixels of the same type to share openings in the metal mask, reducing spacing and position deviations, and incorporating isolating grooves/rods to minimize fabrication issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-precision metal masks are used for vapor deposition, then the area and shape of organic material can be controlled, but the fabrication complexity and position deviations increase
Solution Approach 1:
The patent employs asymmetric sub-pixel shapes (rectangular, triangular, trapezoidal) arranged in specific patterns that eliminate the need for high-precision metal masks. The asymmetric arrangement allows organic material to be deposited without requiring complex mask patterns, thereby reducing fabrication complexity while maintaining positioning accuracy through the geometric design itself
Solution Approach 2:
The pixel is divided into multiple sub-pixels with different shapes and arrangements. This segmentation allows each sub-pixel to be formed through simpler deposition processes without requiring a single complex metal mask pattern, reducing overall fabrication complexity while maintaining precision through the segmented structure
2Area of stationary object
If conventional sub-pixel arrangements are used, then fabrication is simpler, but the aperture ratio is reduced
Solution Approach 1:
The patent transitions from conventional linear or grid arrangements to two-dimensional geometric patterns (rectangular, triangular, trapezoidal arrangements) within the pixel structure. This dimensional reorganization allows sub-pixels to be packed more efficiently, increasing the aperture ratio by utilizing space in novel geometric configurations rather than traditional linear arrangements
Solution Approach 2:
The patent uses rounded-corner rectangular sub-pixel shapes instead of sharp-cornered rectangles. This curvature modification allows sub-pixels to pack more efficiently with reduced spacing between them, increasing the overall aperture ratio while maintaining manufacturing feasibility through the rounded geometry
3Measurement precision
If sub-pixels are arranged closely to increase resolution, then position deviations affect quality, but spacing increases reduce resolution
Solution Approach 1:
The asymmetric sub-pixel shapes and their specific arrangements create geometric patterns that are inherently more tolerant to position deviations during deposition. The asymmetric design ensures that even with slight positioning variations, the overall pixel structure maintains its intended characteristics, thereby achieving high resolution without requiring extremely tight position control
Solution Approach 2:
The patent designs sub-pixel arrangements with built-in tolerance buffers through the use of rounded corners and specific geometric spacing. These design features beforehand cushion against potential position deviations during vapor deposition, ensuring that resolution is maintained even when manufacturing precision varies within acceptable ranges
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
The proposed pixel structure enhances the aperture ratio to over 30%, reduces fabrication complexity of high-precision metal masks, and improves display resolution by minimizing position deviations and increasing the pixel aperture ratio to 48.6%, while maintaining high efficiency and reducing granular sensations.
Implementation Method 1
an organic light-emitting layer comprising first organic light-emitting units and second organic light-emitting units
Implementation Method 2
for the vapor deposition of an organic material by using a vacuum evaporation process
Data Source
AI summary
The present disclosure provides a pixel structure, a displaying substrate, a displaying device and a displaying method, wherein the pixel structure includes first sub-pixels, second sub-pixels and third sub-pixels that are located within a first virtual tetragon; the first sub-pixels are located individually adjacent to midpoints of four side edges of the first virtual tetragon; the second sub-pixels are located individually at four interior angles of the first virtual tetragon; and two center lines of the first virtual tetragon delimit the first virtual tetragon into four second virtual tetragons, and the third sub-pixels are located individually at first interior angles within the four second virtual tetragons.