Display Common Voltage Mesh Layout for Thin Bezels
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Solution Overview
Problem
Display devices face issues with common voltage drops and bezel thickness, particularly in bezel-less designs where the common voltage line is exposed on the edges, leading to voltage loss and bezel visibility.
Innovation Solution
The display device incorporates an external common voltage line in the non-display area connected to common voltage lines within the display area, forming a mesh structure with transverse and longitudinal components, and includes driving voltage and initialization voltage lines with multi-layered structures, connected via connecting members on different layers, to prevent voltage drops and minimize bezels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the common voltage line is disposed outside the display area, then the bezel thickness is reduced, but common voltage drops occur leading to poor long-range uniformity
Solution Approach 1:
The patent transitions the common voltage line from a two-dimensional external routing (outside display area) to a three-dimensional internal routing (within display area at different layers). By placing the common voltage line inside the display area and using multi-layer structures with connecting members, the system achieves both thin bezel and stable voltage distribution without voltage drops.
2Reliability
If the common voltage line is disposed inside the display area, then long-range uniformity is improved, but the bezel thickness increases
Solution Approach 1:
The patent segments the common voltage line into multiple sections disposed at different layers within the display area. By dividing the voltage line into segments across multiple layers and connecting them strategically, the system maintains voltage stability while minimizing the horizontal space required, thus reducing bezel thickness.
3Reliability
If multi-layered voltage lines are used, then voltage drop prevention is achieved, but device complexity increases
Solution Approach 1:
The patent makes the voltage line structure multi-functional by having it serve both as electrical conductor and as space-efficient design element. The same multi-layered voltage line structure that prevents voltage drops also enables the reduction of bezel thickness, achieving two functions simultaneously rather than adding separate structures.
Data Source
AI summary
A display device includes: a substrate including a display area and a non-display area; an external common voltage line disposed in the non-display area; a plurality of pixels and a common voltage line disposed in the display area; and a driving voltage line connected to each of the plurality of pixels, wherein a subset of the plurality of pixels overlaps the common voltage line in the display area in a plan view, and the external common voltage line and the common voltage line are connected to each other.