Sub-Pixel Bridge Layout With Dummy Electrodes for Narrow Display Borders
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Solution Overview
Problem
Existing display devices face challenges in optimizing space efficiency, particularly in the arrangement and connectivity of sub-pixels and bridge lines, leading to inefficient use of the display area and non-display area.
Innovation Solution
The display device incorporates a novel design with vertical bridge lines positioned closer to the edge of sub-pixel units, dummy electrodes electrically connected to horizontal lines, and auxiliary conductive patterns, and via holes to facilitate connectivity between horizontal and vertical lines, and auxiliary conductive patterns to reduce the bridge between vertical and horizontal lines, enhancing the integration of sub-pixel circuits and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If vertical bridge lines are positioned closer to the edge of sub-pixel units, then space efficiency is improved and non-display area is reduced, but the bridge between vertical and horizontal lines is reduced which may affect connectivity
Solution Approach 1:
The dummy electrode serves as an intermediary element that maintains electrical connectivity between the horizontal bridge line and vertical bridge lines while allowing the vertical bridge lines to be positioned closer to the edge. The dummy electrode is electrically connected to both the horizontal bridge line and at least one vertical bridge line, ensuring signal transmission is preserved even when the bridge between lines is reduced.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning vertical bridge lines in different vertical positions relative to horizontal bridge lines. The dummy electrode is placed in a boundary portion between sub-pixel units and connected to both horizontal and vertical lines, creating a three-dimensional connectivity structure that maintains electrical pathways while reducing planar bridge length.
2Reliability
If dummy electrodes are electrically connected to horizontal bridge lines and vertical bridge lines, then connectivity is enhanced, but device complexity increases
Solution Approach 1:
The dummy electrode performs multiple functions simultaneously: it acts as a connectivity element between horizontal and vertical bridge lines, serves as an electrical connection point for signal transmission, and maintains the structural integrity of the pixel circuit architecture. This multi-functionality reduces the need for additional separate connection elements.
Solution Approach 2:
The dummy electrode is integrated into the existing pixel circuit structure by merging it with the horizontal bridge line and vertical bridge line connection system. The dummy electrode is formed as part of the conductive pattern layer and is electrically connected to both horizontal and vertical lines through via holes, combining multiple connection functions into a single integrated element.
3Reliability
If via holes are used to facilitate connectivity between horizontal and vertical lines, then connectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The dummy electrode serves as an intermediary that simplifies the via hole connection structure. Instead of requiring direct via holes between horizontal and vertical bridge lines, the dummy electrode provides a intermediate connection point that reduces the precision requirements for via hole positioning while maintaining electrical connectivity.
Solution Approach 2:
The dummy electrode is formed in advance as part of the conductive pattern layer before the final via holes are created. This preliminary formation establishes the connection pathway and guides the subsequent via hole drilling process, reducing the precision requirements by providing a pre-established target for via hole positioning.
Data Source
AI summary
A display device includes: a first sub-pixel and a second sub-pixel arranged along a first direction, and forming a first sub-pixel unit; a third sub-pixel and a fourth sub-pixel arranged along the first direction, and forming a second sub-pixel unit adjacent to the first sub-pixel unit; a pixel circuit in each of the first to the fourth sub-pixels; a vertical bridge line extending in a second direction, and located in each of the first and the second sub-pixel units; a data line extending in the second direction, and spaced from the vertical bridge line; a horizontal bridge line extending in the first direction; and a dummy electrode in a boundary portion between the first sub-pixel unit and the second sub-pixel unit, and electrically connected to the horizontal bridge line. The dummy electrode may be electrically connected to at least one of the first and the second sub-pixel units.