Display Driver Layout for Narrow-Bezel Diagonal Stain Reduction
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Solution Overview
Problem
Display devices with narrow bezels are prone to a diagonal stain phenomenon due to voltage coupling and signal fluctuations, particularly at the contact points of vertical and horizontal emission lines, which affect the aesthetic quality and functionality.
Innovation Solution
The display device incorporates a substrate design with a bending area and strategically positioned scan and emission drivers, including a scan driver on one side and a bending area, and a substrate design that includes a first emission driver on the other, connected to the horizontal emission lines, with the scan driver connected to the vertical scan lines, and the emission driver connected to the horizontal scan lines, with the scan driver connected to the vertical scan lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If circuits are concentrated on one side of the non-display area to minimize bezel width, then the bezel width is reduced, but the diagonal stain phenomenon occurs due to voltage coupling and signal fluctuations
Solution Approach 1:
The emission driver is divided into multiple emission drivers positioned at different locations (first emission driver on one side, second emission driver on the other side). This segmentation distributes the circuit components more evenly across the non-display area, reducing concentration on one side while maintaining narrow bezel width, and thereby reducing voltage coupling and diagonal stain phenomena.
Solution Approach 2:
Additional emission lines are introduced as intermediary connections between the emission drivers and the display area. These additional emission lines act as mediators to better distribute and stabilize the emission signals, reducing voltage fluctuations and coupling effects that cause diagonal stains, while allowing the bezel to remain narrow.
2Length of stationary object
If emission drivers are positioned at the edges of the non-display area, then the bezel width is minimized, but voltage coupling and signal fluctuations increase causing diagonal stains
Solution Approach 1:
The emission driver function is segmented and distributed across multiple emission drivers positioned at different locations within the non-display area. This distribution reduces the signal path length and voltage coupling between adjacent circuits, thereby improving signal stability while maintaining minimal bezel width.
Solution Approach 2:
Different emission drivers are positioned at specific locations (first emission driver on one side, second emission driver on the other side) to optimize local signal characteristics. This localized positioning allows each emission driver to serve its specific region with reduced interference, improving overall signal stability while maintaining narrow bezels.
Data Source
AI summary
A display device includes: a substrate including a display area and a non-display area surrounding the display area; pixels in the display area and connected to first horizontal scan lines extending in a first direction and horizontal emission lines extending in the first direction; a first scan driver on one side of the non-display area; and a first emission driver on another side of the non-display area, wherein the first scan driver is connected to first vertical scan lines extending in a second direction different from the first direction, the first vertical scan lines contact the first horizontal scan lines in the display area, and the first emission driver is directly connected to the horizontal emission lines.