Display Device Constant Voltage Line Overlap Insulation
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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 placement of second power voltage lines.
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 mesh patterns in the display area by dispersing current and preventing heat emission and voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area size is reduced to achieve a thin bezel, then the bezel thickness is reduced and display area is increased, but the path for conductive fan-out lines becomes insufficient causing mesh pattern visibility
Solution Approach 1:
The patent introduces a third dimension (vertical stacking) by placing first and second constant voltage lines on different insulating layers. This allows conductive lines to route through the vertical dimension rather than being constrained to a single plane, enabling sufficient path length for fan-out lines within the reduced non-display area while maintaining display area expansion.
Solution Approach 2:
The patent nests multiple conductive lines within a compact spatial configuration by having first and second constant voltage lines overlap in plan view while being separated vertically by insulating layers. This nesting approach maximizes the use of available space in the non-display area to accommodate necessary conductive paths.
2Reliability
If second power voltage lines are extended into the display area to provide sufficient conduction path, then electrical connection is improved, but mesh pattern visibility increases
Solution Approach 1:
By routing second power voltage lines through the vertical dimension using multiple insulating layers, the patent achieves sufficient electrical connection paths without extending lines horizontally into the display area. The overlapping configuration in plan view with vertical separation ensures reliable electrical connections while keeping lines confined to the non-display area.
3Device complexity
If first and second constant voltage lines are placed on the same layer to reduce manufacturing complexity, then device complexity is reduced, but electrical insulation becomes difficult causing short circuits
Solution Approach 1:
The patent resolves the insulation problem by separating first and second constant voltage lines into different vertical layers using insulating layers. This vertical separation maintains electrical insulation while allowing the lines to overlap in plan view, achieving both insulation reliability and manufacturing feasibility through the third dimension.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the first and second constant voltage lines. These insulating layers act as mediators that enable the coexistence of overlapping conductive lines in plan view while maintaining electrical insulation, thus resolving the contradiction between line proximity and electrical isolation.
4Ease of manufacture
If conductive lines are routed through a single layer to simplify manufacturing, then manufacturing process is simplified, but current dispersion is insufficient causing heat emission and voltage drops
Solution Approach 1:
The patent achieves current dispersion by distributing current through multiple vertical layers rather than relying solely on horizontal routing complexity. The first and second constant voltage lines on different insulating layers provide parallel current paths, improving current dispersion and reducing heat emission and voltage drops while maintaining manufacturability.
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.