OLED Planarization Layer Uneven Pattern Design
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Solution Overview
Problem
Conventional OLED displays face limitations in color reproducibility and luminance due to low emission efficiency of materials, and forming uneven patterns to address this issue complicates the manufacturing process and can cause substrate deformation.
Innovation Solution
An OLED display with a substrate featuring a planarization layer and an uneven pattern on its surface, where the thickness and width of strip lines vary non-uniformly, and a manufacturing method involving etching with a mask that differentiates light transmission between the center and edges to form the pattern, simplifying the process and preventing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an uneven pattern is formed to improve viewing angle and color reproducibility, then color shift is prevented and viewing angle is improved, but the manufacturing process becomes complicated and substrate deformation may occur
Solution Approach 1:
The patent applies parameter changes by varying the thickness and width of the uneven pattern across different regions of the substrate. Specifically, the uneven pattern has different thicknesses at the center portion versus the end portions, allowing optimization of light scattering properties without requiring complex multi-step manufacturing processes. This gradient structure improves color reproducibility while maintaining manufacturing simplicity.
2Ease of manufacture
If an uneven pattern is formed uniformly across the substrate, then manufacturing is simplified, but color shift occurs at different viewing angles
Solution Approach 1:
The patent implements local quality by making the uneven pattern non-uniform across the substrate surface. The thickness and width of the uneven pattern are specifically optimized for different regions: the center portion has different dimensions compared to the end portions. This localized variation ensures that each region scatters light appropriately for its position, preventing color shift while maintaining a relatively simple single-step manufacturing process.
3Illumination intensity
If the thickness of the uneven pattern is increased to improve light scattering, then viewing angle is improved, but luminance decreases due to light absorption
Solution Approach 1:
The patent optimizes the balance between viewing angle and luminance by carefully controlling the thickness parameter of the uneven pattern. Rather than using a uniform thick pattern that would scatter light effectively but absorb too much, the patent employs a gradient thickness design where the pattern thickness is optimized to provide sufficient scattering for wide viewing angles while minimizing light absorption losses, thereby maintaining high luminance.
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 non-uniform pattern enhances viewing angle and color reproducibility while reducing manufacturing complexity and costs by effectively scattering light and preventing color shift, thereby improving the display's luminance and expressible color range.
Implementation Method 1
an uneven pattern is non-uniformly formed on a top surface of a planarization layer, and thus light may be scattered, thereby effectively preventing color shift due to a viewing angle
Data Source
AI summary
An organic light emitting diode display includes a substrate, a planarization layer disposed on the substrate, a first electrode disposed on the planarization layer, an emission layer disposed on the first electrode, and a second electrode disposed on the emission layer, wherein an uneven pattern is formed on a top surface of the planarization layer, the uneven pattern comprises a strip line having a plurality of thicknesses and widths, and a thickness of the strip line becomes smaller as a distance from a center portion of the first electrode becomes larger.