Mask Plate Thinned Strips for Display Evaporation Precision
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Solution Overview
Problem
The existing mask plates for display panel manufacturing suffer from poor edge linearity of supporting and shielding strips, low shielding accuracy at pixel positions, and large shadow areas during evaporation, which affect the precision of high-pixel-density display panels.
Innovation Solution
The mask plate design includes first and second supporting and shielding strips with thinned areas on their surfaces, which intersect perpendicularly, improving edge linearity and reducing evaporation shadow areas by limiting the evaporation angle, thereby enhancing shielding accuracy and precision for high-pixel-density displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the supporting and shielding strips are made with uniform thickness, then the structural strength is maintained, but the edge linearity deteriorates and shadow areas increase during evaporation
Solution Approach 1:
The supporting and shielding strips are designed with non-uniform thickness distribution, where the thickness varies along the length of the strip. This local quality change allows the edge portions to have reduced thickness for improved linearity and reduced shadow areas, while maintaining sufficient strength in critical regions.
Solution Approach 2:
The thickness parameter of the supporting and shielding strips is changed from a constant value to a variable value that changes along the strip length. This parameter change enables optimization of both edge linearity and structural strength by adjusting the thickness profile to suit different functional requirements along the strip.
2Manufacturing precision
If the supporting and shielding strips have larger thickness, then the structural strength is improved, but the shadow areas during evaporation increase and shielding accuracy deteriorates
Solution Approach 1:
Different sections of the supporting and shielding strips have different thicknesses optimized for their specific functions. The sections requiring high shielding accuracy have reduced thickness to minimize shadow areas, while sections requiring structural support maintain sufficient thickness.
Solution Approach 2:
The problem is solved by introducing variation in the thickness dimension along the length of the strips. Instead of a single thickness value, the thickness varies continuously or in steps, creating a gradient structure that simultaneously satisfies both shielding accuracy and structural strength requirements.
3Manufacturing precision
If the mask plate uses conventional strip design without thinned areas, then the manufacturing process is simpler, but the edge linearity is poor and pixel positioning accuracy deteriorates
Solution Approach 1:
Thinned areas are introduced at specific locations along the supporting and shielding strips, creating local variations in thickness. These thinned areas improve edge linearity and pixel positioning accuracy without requiring complete redesign of the entire strip structure.
Solution Approach 2:
The supporting and shielding strips are segmented into different thickness zones, with thinned areas separated from the main body. This segmentation allows the thinned portions to be optimized for precision while the thicker portions maintain structural integrity.
Data Source
AI summary
A mask plate includes a plurality of first supporting and shielding strips, and a plurality of second supporting and shielding strips. The second supporting and shielding strips and the first supporting and shielding strips perpendicularly intersect. The first supporting and shielding strips and the second supporting and shielding strips are provided with at least one objective supporting and shielding strip, and an edge of a predetermined surface of the objective supporting and shielding strip parallel to an extending direction of the objective supporting and shielding strip is provided with a thinned area; the thinned area extends in the extending direction of the objective supporting and shielding strip, and has a thickness smaller than a thickness of other areas except the thinned area; and the predetermined surface is a surface of the objective supporting and shielding strip facing a deposition material when a mask evaporation is performed through the mask plate.