Landscape LCD Data Line Routing for Short Circuit Prevention
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Solution Overview
Problem
Landscape type LCDs face issues with short circuit defects due to insufficient spacing between densely packed data lines, which complicates failure detection and stability.
Innovation Solution
The LCD design includes data lines alternately positioned in different layers in a narrow area, connected via first and second lines in different layers, and connected to different test pads, allowing for easy failure detection and preventing short circuit defects by ensuring adequate spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data lines are densely packed in landscape type LCD to increase pixel count, then productivity and display resolution are improved, but short circuit defects occur due to insufficient spacing between data lines
Solution Approach 1:
The patent applies multi-layer wiring technology where data lines are routed through different layers (first layer and second layer) instead of being confined to a single plane. This dimensional transition allows data lines to be densely packed in the horizontal direction while maintaining sufficient spacing vertically through layer separation, thus preventing short circuits while achieving high pixel counts in landscape displays
Solution Approach 2:
The data line routing is segmented into multiple layers, with odd-numbered data lines routed through one layer and even-numbered data lines routed through another layer. This segmentation distributes the dense data lines across different spatial planes, reducing the probability of short circuit defects while maintaining high pixel density
2Area of stationary object
If data lines are densely packed in narrow area, then area utilization is improved, but failure detection becomes difficult due to insufficient spacing
Solution Approach 1:
By routing data lines through multiple layers, the patent creates accessible test pads on the surface that correspond to data lines in different layers. This allows failure detection through surface-level connections while maintaining dense packing in the underlying narrow area, as the test access points are distributed across different layer positions
3Stability of the object's composition
If data lines are alternately routed through upper and lower dummy regions, then spacing stability is improved, but device complexity increases due to multi-layer routing
Solution Approach 1:
The patent establishes a universal routing pattern where odd-numbered data lines follow one routing path through dummy regions and even-numbered data lines follow another path. This standardized multi-path routing system provides consistent spacing stability across all data lines while managing complexity through systematic design rules that can be applied uniformly across the display
Data Source
AI summary
A liquid crystal display (LCD) includes a pixel unit having pixels, each of the pixels positioned at a corresponding intersection of gate lines and data lines. A drive circuit unit is positioned at one side of the pixel unit to supply driving signals to the gate lines and the data lines. Test pads are connected to the data lines. In the LCD, each of the data lines is electrically connected between the pixel unit and the drive circuit unit via one or more lines among a first line formed in a first layer and a second line formed in a second layer, and wherein each of the data lines is connected to a different test pad from the test pad connected to adjacent data lines in each of the first and second layers.