Pixel Switching Layout for Fewer Scan-Data Line Intersections
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Solution Overview
Problem
Liquid crystal displays (LCDs) face a high likelihood of short circuits between scan lines and data lines due to particle intersections, which reduces manufacturing yield and increases defects.
Innovation Solution
The design reduces the number of intersections between scan lines and data lines by arranging the first and second switching elements and their respective electrodes in a manner that minimizes overlap, using a substrate with scan lines extending in one direction and data lines in a perpendicular direction, and incorporating a storage electrode that overlaps the source connector to form a storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan lines and data lines are arranged in a conventional grid pattern, then the display device can be manufactured with standard processes, but the number of intersections increases leading to higher short circuit risk
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional 2D grid arrangement to a 3D stacked architecture. Scan lines are positioned on a first substrate while data lines are positioned on a second substrate, separating them in the vertical dimension. This spatial separation eliminates intersections between scan and data lines, thereby reducing short circuit risk while maintaining the necessary electrical connections through vertical vias and contact holes.
2Reliability
If the number of intersections between scan lines and data lines is reduced, then short circuit risk decreases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the display device into multiple independent substrates or layers. Scan lines are formed on a first substrate while data lines are formed on a second substrate, physically separating the line formation processes. This segmentation allows each substrate to be manufactured and tested independently before assembly, simplifying the overall manufacturing process despite the multi-layer complexity.
Solution Approach 2:
The patent applies the nesting principle by integrating multiple functional layers within a compact stacked structure. The first substrate containing scan lines is nested with the second substrate containing data lines, with connection elements such as contact holes and vias nesting through the layers to establish electrical pathways. This nested arrangement reduces the horizontal footprint and minimizes intersection points while maintaining manufacturing feasibility.
3Area of stationary object
If scan lines and data lines intersect frequently, then the display area can be maximized, but particle-induced defects increase at intersection points
Solution Approach 1:
The patent applies the extraction principle by removing the harmful intersection points from the system. By separating scan lines and data lines onto different substrates, the patent extracts the problematic intersection regions where particles could cause defects. The display area is maintained through efficient layout design on each substrate, while the harmful intersections are completely eliminated from the structure.
Data Source
AI summary
Embodiments of the current disclosure to provide a display device which can reduce the number of intersections of scan lines and data lines. According to an embodiment of the disclosure, a display device comprises: a substrate; scan lines extending along a first direction; data lines extending along a second direction that intersect the first direction; a first switching element; a first pixel electrode connected to a first source electrode of the first switching element; a second switching element; and a second pixel electrode connected to a second source electrode of the second switching element. The first pixel electrode and the second pixel electrode are disposed along the second direction, and a first source electrode and a first drain electrode of the first switching element extend along the second direction in an area overlapping a first active layer of the first switching element.