Tiled Display Scan Layout With Auxiliary Stages for Seam Reduction
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Solution Overview
Problem
Tiled display devices often exhibit seams between adjacent display devices, leading to a disconnected appearance of the displayed image.
Innovation Solution
Incorporation of dummy stages and auxiliary stages in the non-display areas of the display panel, which include dummy transistors overlapping fan-out or data connection lines, along with a specific arrangement of scan and source driving circuits to minimize the distance between display areas and ensure seamless image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display devices are connected to form a tiled display device, then the screen size is increased, but seams appear between adjacent display devices causing disconnected image appearance
Solution Approach 1:
The patent moves the scan driving unit from the display area to the non-display area, utilizing the vertical space dimension above the display panel. This relocation allows the scan signals to be generated closer to the display area, reducing the horizontal distance to adjacent display devices and minimizing visible seams while maintaining the large screen size.
Solution Approach 2:
The patent introduces a dummy stage as an intermediary element in the non-display area. This dummy stage includes dummy transistors that overlap with fan-out lines, serving as a mediator to reduce the distance between the scan driving unit and the display area, thereby improving image continuity across tiled displays.
2Ease of operation
If the scan driving unit is disposed in the display area, then the connection to scan lines is direct, but the distance to adjacent display devices increases causing visible seams
Solution Approach 1:
The scan driving unit is relocated from the horizontal display area to the vertical non-display area above the panel. This dimensional shift allows the scan signals to propagate vertically closer to the display area, reducing the horizontal distance to adjacent displays and minimizing seams while maintaining direct scan line connection.
Solution Approach 2:
The dummy stages are positioned in advance in the non-display area, with dummy transistors strategically placed to overlap fan-out lines. This preliminary arrangement of components in the non-display area prepares the signal path to minimize distance to adjacent display devices before the actual display operation begins.
3Length of stationary object
If dummy stages with dummy transistors are added in the non-display area, then the distance between display areas is reduced, but the device complexity increases
Solution Approach 1:
The dummy transistors in the non-display area serve multiple functions: they reduce the distance to adjacent display devices, overlap with fan-out lines to optimize signal routing, and maintain circuit symmetry. This multi-functionality justifies the added complexity by delivering multiple benefits from a single structural addition.
Solution Approach 2:
The dummy stages replicate the basic transistor structure of functional stages but in a simplified form suitable for the non-display area. This copying approach allows the use of standard manufacturing processes and familiar circuit designs, reducing the actual complexity increase despite the additional components.
Data Source
AI summary
A display device may include a display panel and a scan driving unit. The display panel may include a display area and a non-display. The display area may include scan lines, data lines, and pixels connected to the scan lines and the data lines. The non-display area may abut the display area and may include data connection lines. The data connection lines may be respectively connected to the data lines. The scan driving unit may include scan stages and auxiliary stages. The scan stages may be disposed on the display area and may be electrically connected to the scan lines for providing scan signals through the scan lines to the pixels. The auxiliary stages may be disposed on the non-display area, may include auxiliary transistors, and may provide carry signals to one or more of the scan stages. Some of the auxiliary transistors overlap the data connection lines.