LCD Storage Wiring Segmentation for Voltage Ripple
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with signal ripple for voltage distribution, current-resistance (IR) drop phenomenon, and horizontal cross torque, which affect their performance and side visibility.
Innovation Solution
The LCD device incorporates a specific configuration with subpixel units, storage lines, and switching elements, including a third switching element with a floating electrode, and storage capacitors to manage voltage distribution and reduce IR drop, while optimizing the layout of storage lines to form a mesh structure for reduced resistance and improved signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage distribution structures are used in LCD devices, then device simplicity is maintained, but signal ripple occurs and IR drop phenomenon affects performance
Solution Approach 1:
The storage wiring is segmented into multiple storage lines (first storage line, second storage line, third storage line) that are disposed at different layers and positions. This segmentation allows voltage to be distributed through multiple pathways, reducing signal ripple and IR drop while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The patent introduces a multi-layer wiring structure where storage lines are disposed at different layers (first layer, second layer, third layer). This dimensional arrangement creates three-dimensional voltage distribution pathways, reducing resistance and signal ripple by utilizing spatial separation rather than merely increasing planar wiring density.
2Ease of manufacture
If simple storage line layouts are used, then manufacturing is easier, but horizontal cross torque increases and side visibility deteriorates
Solution Approach 1:
Different storage lines are positioned with specific local characteristics: the first storage line overlaps the first subpixel electrode, the second storage line overlaps the second subpixel electrode, and the third storage line is disposed between them. This localized positioning optimizes voltage distribution to specific regions, reducing horizontal cross torque while maintaining manufacturability through standardized layering.
Solution Approach 2:
The multiple storage lines are connected through switching elements to create equipotential regions across different subpixel electrodes. This equipotential arrangement balances voltage distribution, reducing horizontal cross torque and improving side visibility while using a manufacturable multi-layer structure.
3Device complexity
If storage lines are disposed on the same layer, then device structure is simpler, but voltage distribution uniformity decreases causing IR drop
Solution Approach 1:
The patent transitions from planar (2D) to three-dimensional (3D) wiring arrangement by disposing storage lines on multiple layers. The first storage line is on the first layer, the second storage line on the second layer, and the third storage line on the third layer. This vertical stacking creates multiple voltage distribution pathways through the thickness of the device, improving voltage uniformity and reducing IR drop while adding manageable structural complexity.
Solution Approach 2:
Multiple storage lines on different layers are merged through electrical connections via switching elements to form an integrated voltage distribution network. This merging of multi-layer lines creates redundant pathways for voltage delivery, ensuring uniform distribution and reducing IR drop effects while maintaining a cohesive device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces signal ripple, prevents IR drop, and minimizes horizontal cross torque, enhancing the side visibility and overall performance of the LCD device.
Implementation Method 1
a voltage is applied to the field generating electrodes to generate an electric field in the liquid crystal layer
Implementation Method 2
a direction of liquid crystal molecules in the liquid crystal layer is determined and a polarization of incident light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A liquid crystal display device includes a substrate (110), a first gate line (GL1), a first data line (DL1), a first subpixel unit (SPX1) including a first switching element (TR1) having a control electrode connected to the first gate line (GL1), a first electrode connected with the first data line (DL1), and a second electrode connected with a first subpixel electrode (PE1), a second subpixel unit (SPX2) including a second switching element (TR2) which includes a control electrode connected with the first gate line (GL1), a first electrode connected with the first data line (DL1), and a second electrode connected with a second subpixel electrode (PE2), and a third switching element (TR3) which includes a control electrode connected with the first gate line (GL1) the liquid crystal display device further comprising a storage wiring (RD) including a first storage line (RTL1), at least a part thereof overlapping the first subpixel electrode (PE1), and a second storage line (RTL2), at least a part thereof overlapping the second subpixel electrode (PE2).