OLED Sub-Pixel Grid Arrangement for Shadow Mask Fabrication
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Solution Overview
Problem
The challenge in achieving high resolution in organic electroluminescent display (OLED) devices is the difficulty in fabricating fine shadow masks for forming red, green, and blue emitting layers due to the limited reduction in width of sub-pixel regions, which leads to shadowing issues and deformation of the shadow mask.
Innovation Solution
The OLED device is designed with red and green sub-pixel regions alternately arranged in the first column and blue sub-pixel regions in the second column, allowing for increased spacing between adjacent sub-pixel regions, facilitating the fabrication of shadow masks with improved resolution by maintaining a margin in width reduction and preventing shadowing problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of sub-pixel regions is reduced to achieve high resolution, then the resolution is improved, but shadowing problems and shadow mask deformation occur
Solution Approach 1:
The patent transitions from a linear arrangement of sub-pixels (red, green, blue in sequence) to a two-dimensional grid arrangement where sub-pixels are positioned at intersections of horizontal and vertical lines. This dimensional change allows for increased spacing between adjacent sub-pixels of the same color while maintaining high resolution, thereby preventing shadowing issues during the deposition process.
2Manufacturing precision
If the width of sub-pixel regions is reduced to achieve high resolution, then the resolution is improved, but the shadow mask becomes difficult to fabricate
Solution Approach 1:
By arranging sub-pixels in a two-dimensional grid pattern rather than a one-dimensional linear sequence, the patent creates sufficient spacing between adjacent sub-pixels. This spacing makes it feasible to fabricate shadow masks with adequate thickness and structural integrity, eliminating the manufacturing difficulties associated with ultra-fine linear patterns.
Solution Approach 2:
The patent divides the pixel array into distinct horizontal and vertical line structures that intersect to form sub-pixel regions. This segmentation approach allows the shadow mask to be designed with larger feature sizes at the mask level while still achieving fine resolution in the final display, as the sub-pixels are defined by the intersection pattern rather than continuous fine lines.
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 enables easier fabrication of shadow masks with higher resolution, reducing the thickness difference of the blocking portion and preventing deformation, thus enhancing the aperture ratio and resolution of the OLED device.
Implementation Method 1
an electric current is supplied to the organic light-emitting diode from the power line, the organic light-emitting diode emits light
Data Source
AI summary
An organic electroluminescent display device including first to fourth pixel regions each including red, green and blue sub-pixel regions, each of the first to fourth pixel regions being divided into first and second columns, the first column being divided into first and second rows. A red sub-pixel region and a green sub-pixel region are respectively arranged in the first and second rows, and a blue sub-pixel region is arranged in the second column. A red emitting layer is formed in the red sub-pixel region; a green emitting layer is formed in the green sub-pixel region; and a blue emitting layer is formed in the blue sub-pixel region.