Display Device Inspection Pad Placement for Seam Reduction
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Solution Overview
Problem
Tiled display devices have visible seam lines due to non-display areas, which detract from viewer experience and concentration.
Innovation Solution
Incorporating inspection pads and scan drivers within the display area, connected to signal and voltage lines, to detect defects and reduce non-display areas by dividing and inserting these components between pixel columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inspection pads and scan drivers are placed outside the display area, then they can be easily accessed for testing and maintenance, but the non-display area increases creating visible seam lines
Solution Approach 1:
The inspection pads are moved from a traditional external placement to an internal placement within the display area, utilizing the vertical dimension and space between pixel columns. This dimensional repositioning allows the components to be accessible through the display area itself, eliminating the need for additional external non-display areas while maintaining testing and maintenance capabilities.
Solution Approach 2:
The inspection pads and scan drivers are nested within the display area structure, specifically positioned between pixel columns. This nesting approach allows the testing and maintenance components to be integrated into the existing display structure without adding external extensions, thereby reducing the non-display area while preserving functionality.
2Area of stationary object
If inspection pads are placed between pixel columns within the display area, then the non-display area is reduced eliminating seam lines, but the complexity of routing signal and voltage lines increases
Solution Approach 1:
The display area is segmented into functional zones with inspection pads positioned between pixel columns. This segmentation allows for organized routing of signal and voltage lines through dedicated pathways, reducing the overall routing complexity by creating structured zones for different electrical connections rather than having all lines traverse the entire display area.
Solution Approach 2:
Scan drivers are positioned as intermediary components between the signal lines and the inspection pads. These intermediaries facilitate the routing of signals and voltages, simplifying the overall connection architecture by providing localized control and distribution points that reduce the complexity of direct long-distance routing across the display area.
3Object-affected harmful factors
If the non-display area is minimized, then the viewing experience is enhanced by reducing visible seams, but the space for placing testing and control components is reduced
Solution Approach 1:
Testing and control components are relocated from the horizontal plane (external non-display area) to the internal structure between pixel columns. This dimensional transition allows the components to be housed within the display area's internal architecture, eliminating external non-display areas and visible seam lines while preserving adequate space for testing and control functions through vertical and inter-column positioning.
Data Source
AI summary
A display device includes a display area and a non-display area adjacent to the display area; a first scan line that extends in a row direction and transmits a first scan signal; a first pixel part electrically connected to the first scan line; a second pixel part electrically connected to the first scan line and spaced apart from the first pixel part in the row direction; and a first inspection pad disposed between the first pixel part and the second pixel part and electrically connected to the first scan line.