Display Voltage Line Overlap Layout for Thin-Bezel Mesh Reduction
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Solution Overview
Problem
In display devices with thin bezels, the reduced non-display area can lead to insufficient paths for conductive fan-out lines, causing some lines to extend into the display area, particularly affecting the visibility of mesh patterns in the display area due to the second power voltage line.
Innovation Solution
The implementation of a display device design featuring first and second constant voltage lines that overlap and are insulated from each other by insulating layers, creating overlap areas where they contact and areas where they are insulated, which helps in reducing the visibility of the mesh pattern in the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the non-display area size is reduced to achieve a thin bezel, then the bezel thickness is improved, but the path for conductive fan-out lines becomes insufficient
Solution Approach 1:
The patent extends conductive lines from the two-dimensional plane into the third dimension by routing them through insulating layers. Specifically, constant voltage lines are positioned on different layers (first constant voltage lines on one insulating layer, second constant voltage lines on another insulating layer) to create vertical separation and avoid conflicts in the limited horizontal space of the reduced non-display area.
Solution Approach 2:
Insulating layers serve as intermediaries between overlapping conductive lines. The patent uses multiple insulating layers to separate first and second constant voltage lines that overlap in the plan view, allowing them to coexist in the same horizontal footprint without electrical interference while maintaining compact routing.
2Ease of operation
If conductive lines are extended into the display area to compensate for insufficient non-display area, then the path for conductive lines is improved, but the mesh pattern visibility deteriorates
Solution Approach 1:
The patent moves conductive lines from the horizontal plane into the vertical dimension by placing them on different insulating layers. This allows constant voltage lines to overlap in the display area without creating visible mesh patterns, as the lines are separated vertically rather than lying flat on the same surface.
Solution Approach 2:
Insulating layers act as mediators that allow conductive lines to pass through or overlap in the display area without creating visual interference. The insulating layers enable the constant voltage lines to be positioned in three-dimensional space such that they do not create the harmful mesh pattern effect on the display surface.
3Reliability
If first and second constant voltage lines overlap and contact each other, then electrical connectivity is improved, but heat emission and voltage drop issues worsen
Solution Approach 1:
The patent positions first and second constant voltage lines on different insulating layers, creating vertical separation. This three-dimensional arrangement allows the lines to overlap in the plan view for compact routing while maintaining electrical insulation between them, preventing unwanted current flow and heat generation from direct contact.
Solution Approach 2:
Insulating layers serve as intermediaries between overlapping constant voltage lines, providing electrical insulation while allowing the lines to occupy the same horizontal footprint. This separation prevents direct electrical contact that would cause heat emission and voltage drop, while still enabling compact routing through the display area.
Data Source
AI summary
A display device includes a plurality of first constant voltage lines extended along a first direction and arranged along a second direction crossing the first direction, a plurality of second constant voltage lines extended along the second direction and arranged along the first direction, a first overlap area in which the plurality of first constant voltage lines and the plurality of second constant voltage lines overlap and contact each other, and a second overlap area in which the plurality of first constant voltage lines and the plurality of second constant voltage lines overlap and are insulated from each other.