Bridge Lines for LCD Storage Capacitor Voltage Ripple
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Solution Overview
Problem
Large liquid crystal display devices, especially those displaying fast-moving objects like sports, are prone to 'side shadow' issues due to voltage fluctuations on storage capacitor lines, which affect image quality and power consumption.
Innovation Solution
Incorporating storage capacitors connected to storage capacitor lines and stem lines, with bridge lines connecting multiple storage capacitor lines to reduce resistance and ripple effects on these lines, thereby suppressing side shadows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of liquid crystal display device is increased for large-screen applications, then the display area is improved, but voltage fluctuations on storage capacitor lines increase causing side shadow
Solution Approach 1:
The patent divides the storage capacitor lines into multiple segments by introducing bridge lines that connect intermediate points of storage capacitor lines to stem lines. This segmentation reduces the effective length of each line segment, thereby reducing resistance and voltage fluctuations in each segment while maintaining overall display area.
2Productivity
If double-speed operation is implemented to display fast-moving objects without delay, then the frame rate is improved, but side shadow is likely to occur
Solution Approach 1:
By segmenting storage capacitor lines through bridge lines, the patent reduces resistance and voltage fluctuations that would otherwise be exacerbated by double-speed operation. This enables high frame rates to be achieved without the side shadow effect that typically occurs during fast switching operations.
Solution Approach 2:
The patent adds a new dimensional element to the wiring structure by introducing bridge lines that create additional connection paths between storage capacitor lines and stem lines. This multi-dimensional wiring approach provides alternative current paths that reduce voltage fluctuations during high-speed operation.
3Reliability
If bridge lines are added to connect storage capacitor lines, then resistance of storage capacitor lines is reduced, but device complexity increases
Solution Approach 1:
The bridge lines are strategically positioned to connect intermediate points of storage capacitor lines to stem lines, creating manageable segments. This segmentation approach reduces voltage fluctuations effectively while limiting the increase in complexity to only the necessary connection points rather than complete restructuring of the wiring system.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel in which a plurality of pixels (A) are arranged. A storage capacitor (Cs) is provided in each pixel (A) of liquid crystal panel. The storage capacitor (Cs) is connected to a Cs bus line. The liquid crystal display device includes a plurality of Cs bus lines. The Cs bus line is connected to a stem line. The stem line transfers a driving signal to the storage capacitor (Cs) via the Cs bus line. The liquid crystal display device includes a bridge line, separate from the stem line, for connecting a plurality of Cs bus lines.