OLED Display Subpixel Layout for FMM Crosstalk Reduction
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Solution Overview
Problem
The OLED display device faces issues with crosstalk due to difficulties in expanding and uneven stress of the Fine Metal Mask (FMM), leading to potential image interference.
Innovation Solution
A display substrate design with alternating arrangements of first and third subpixels forming virtual quadrilaterals and parallelograms, along with specific angle and distance configurations, to increase the distance between subpixels and improve FMM manufacturing, reducing crosstalk risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional subpixel arrangements are used, then manufacturing process is simple, but FMM expansion difficulty and uneven stress occur leading to crosstalk
Solution Approach 1:
The patent introduces a staggered subpixel arrangement where odd-numbered and even-numbered subpixel rows are offset from each other by a predetermined distance in the row direction. This asymmetric configuration prevents the FMM from experiencing uniform stress distribution during expansion, thereby reducing crosstalk between adjacent subpixels while maintaining manufacturability
Solution Approach 2:
The patent adds a dimensional offset in the row direction between odd and even subpixel rows, transforming the conventional grid arrangement into a staggered configuration. This dimensional change increases the effective distance between corresponding subpixels in adjacent columns, reducing optical crosstalk while allowing the FMM to expand more uniformly
2Ease of manufacture
If FMM is used for organic material evaporation, then manufacturing cost is reduced, but uneven stress and expansion difficulty occur
Solution Approach 1:
The staggered arrangement of odd and even subpixel rows creates an asymmetric pattern that distributes stress more uniformly across the FMM during expansion. This prevents the uneven stress concentration that would otherwise occur with conventional symmetric arrangements, improving both expansion uniformity and manufacturing precision
Solution Approach 2:
The patent pre-calculates and sets the optimal offset distance between odd and even subpixel rows before manufacturing. This preliminary configuration ensures that the FMM experiences uniform stress distribution from the outset, preventing expansion issues before they occur and maintaining manufacturing precision
3Reliability
If subpixel distance is increased, then crosstalk is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies a partial offset (predetermined distance less than full subpixel pitch) between odd and even rows rather than maximum separation. This partial action achieves sufficient crosstalk reduction while maintaining reasonable manufacturing precision requirements, avoiding the need for extreme positioning accuracy
Data Source
AI summary
A display substrate and a related device. The display substrate includes a plurality of first subpixels, a plurality of second subpixels and a plurality of third subpixels. In a first direction, the first subpixels and the third subpixels are arranged alternately to form a plurality of first subpixel rows, the second subpixels are arranged to form a plurality of second subpixel rows, and the first subpixel rows and the second subpixel rows are arranged alternately in a second direction. Lines connecting centers of two first subpixels and two third subpixels in two adjacent rows and columns form a first virtual quadrilateral, the two first/third subpixels are arranged at two/the other two opposite vertices of the first virtual quadrilateral respectively, and a corresponding second subpixel is located within the first virtual quadrilateral.