Connection wirings routing through active area for thin bezel signal integrity
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Solution Overview
Problem
In display devices with thin bezels, the insufficient space for fanout wirings leads to signal path issues, causing data signal order changes and luminance differences due to process dispersion in conductive layers between active and non-active areas.
Innovation Solution
The display device incorporates connection wirings that pass through the active area, connecting non-active fanout wirings and signal wirings, with specific extension portions and dummy wiring patterns to maintain signal integrity and reduce luminance differences, using different conductive layers for wirings and allowing for the use of a general-purpose driving chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fanout wirings are passed through the active area to secure signal paths in thin bezel structures, then sufficient signal paths are achieved, but data signal order changes and additional mapping of driving chip is required
Solution Approach 1:
The connection wirings are configured to extend in both the first direction (vertical) and second direction (horizontal), creating a two-dimensional routing pattern. This allows the wirings to traverse the active area efficiently while maintaining proper signal ordering, resolving the contradiction between achieving sufficient signal paths and avoiding complex driving chip mapping.
2Adaptability or versatility
If different conductive layers are used for wirings in different areas, then area-specific wiring requirements are met, but luminance differences occur due to process dispersion
Solution Approach 1:
The connection wirings are configured to extend in both the first and second directions, creating a symmetric and uniform wiring pattern across different areas of the active region. This homogeneous configuration ensures that process dispersion affects all areas equally, thereby maintaining luminance uniformity while still allowing area-specific wiring requirements to be met through the flexible two-dimensional extension structure.
3Reliability
If connection wirings are disposed between pixel columns or rows, then signal transmission is achieved, but visual defects may occur from wiring patterns
Solution Approach 1:
The connection wirings are configured to extend in the first direction between pixel columns and in the second direction between pixel rows, creating different wiring orientations in different local regions. This local quality variation allows the wiring pattern to adapt to the pixel arrangement, ensuring reliable signal transmission while minimizing visual defects by distributing wiring patterns across different orientations rather than concentrating them in one direction.
Data Source
AI summary
A display device includes an active area including pixels arranged in a matrix shape, a non-active area disposed at one side of the active area in a first direction and including a pad unit, non-active fanout wirings disposed in the non-active area and connected to the pad unit, signal wirings extending in the first direction to traverse the active area and connected to the pixels, and connection wirings, each at least partially passing through the active area and connecting some of the non-active fanout wirings and some of the signal wirings. Each of the connection wirings include first and third extension portion extending in the first direction, and a second extension portion extending in a second direction, and at least two of the pixels are disposed between corresponding extension portions of two adjacent connection wirings along a direction in which the corresponding extension portions are spaced apart from each other.