Tiled Display Pixel Layout for Seam Line Suppression
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Solution Overview
Problem
Current tiled electronic devices suffer from defects such as bright lines or dark lines at the seams between adjacent devices, which affect display performance.
Innovation Solution
The design includes a substrate with first and second light emitting units arranged along perpendicular directions, where the distance between the first light emitting unit and the edge is less than that of the second, and the lighting region of the first unit is smaller than the second, optimizing pixel pitch and arrangement to minimize seam defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display devices are tiled together to form a large display, then the display area is increased, but bright lines or dark lines appear at the seams between adjacent devices
Solution Approach 1:
The patent applies local quality by implementing different pixel arrangements specifically at the edge regions versus the center regions of the display. Edge pixels are positioned at different locations compared to center pixels, creating localized structural differences that compensate for seam-related optical issues only where needed, without affecting the overall display uniformity.
Solution Approach 2:
The patent introduces asymmetry by deliberately positioning edge pixels at different locations than center pixels in the pixel array. This asymmetric arrangement breaks the regular periodicity at the seams, which helps to distribute and reduce the visibility of bright or dark lines that would otherwise form due to the regular pixel structure aligning across device boundaries.
2Ease of manufacture
If pixels are arranged in a regular grid pattern, then manufacturing is simplified, but seam defects become more visible
Solution Approach 1:
The patent maintains regular grid arrangement for most pixels to ensure manufacturing simplicity, while introducing localized deviations only at edge positions. This approach preserves the ease of manufacturing for the majority of pixels while applying corrective measures only where seam defects occur, balancing manufacturing simplicity with defect reduction.
Solution Approach 2:
The patent applies the partial action principle by modifying the pixel arrangement only partially - specifically at edge positions - rather than changing the entire pixel array structure. This selective modification is sufficient to address seam defects without requiring a complete redesign of the pixel arrangement, thus maintaining manufacturing simplicity while achieving the desired effect.
3Length of moving object
If edge pixels are positioned closer to the edge, then the pixel pitch is reduced, but the lighting region becomes constrained
Solution Approach 1:
The patent employs asymmetry by positioning edge pixels at different distances from the physical edge compared to center pixels. Specifically, edge pixels are arranged to achieve optimized pixel pitch at the seams, while center pixels maintain standard positioning. This asymmetric arrangement allows the system to achieve reduced pixel pitch where needed without uniformly constraining the lighting region across the entire display.
Data Source
AI summary
A display device includes a substrate, a first light emitting unit and a second light emitting unit arranged along a first direction, and a third light emitting unit at least partially overlapped with the first light emitting unit along a second direction perpendicular to the first direction. The first light emitting unit emits a light with a first color, and the second light emitting unit emits a light with a second color different from the first color. The third light emitting unit emits a light with the first color. The substrate has an edge extending along the first direction, and along the second direction, a distance between the first light emitting unit and the edge is less than a distance between the third light emitting unit and the edge. A lighting region of the first light emitting unit is less than a lighting region of the third light emitting unit.