Single Common Line LCD Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal display devices with a high number of common lines parallel to gate lines suffer from reduced aperture ratio and transmittance, especially in high-resolution displays where the area of each unit pixel is smaller, leading to significant reductions in image quality.
Innovation Solution
A liquid crystal display device is designed with a single common line formed at the center of the substrate, parallel to the gate lines, allowing for enhanced aperture ratio and transmittance by positioning thin film transistors and data lines to minimize the area occupied by common lines within each unit pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple common lines are formed parallel to gate lines in conventional liquid crystal display devices, then the common voltage can be applied to each unit pixel, but the aperture ratio and transmittance are reduced due to the area occupied by common lines
Solution Approach 1:
Multiple common lines are merged into a single common line that extends across the entire display device. This consolidation reduces the total area occupied by common lines, thereby increasing the aperture ratio and transmittance while still enabling common voltage to be applied to all unit pixels through the single common electrode layer
Solution Approach 2:
The common line structure transitions from multiple discrete lines distributed across the substrate to a single continuous line extending in one dimension. This dimensional reorganization optimizes space utilization and maximizes the light-transmissive area while maintaining electrical connectivity
2Reliability
If the number of common lines is increased to ensure proper voltage distribution, then the common voltage application is improved, but the transmittance is significantly reduced, especially in high-resolution displays
Solution Approach 1:
Multiple common lines are consolidated into a single common line that spans the entire display device. This merging reduces the total metal line area that blocks light, significantly improving transmittance in high-resolution displays while the single common electrode ensures uniform voltage distribution across all pixel regions
3Stability of the object's composition
If common lines are formed in each unit pixel to control liquid crystal orientation, then the liquid crystal alignment is improved, but the area ratio of light-transmissive regions is reduced
Solution Approach 1:
The common line structure is merged into a single continuous line that provides sufficient electric field for liquid crystal alignment across the entire display. This eliminates the need for multiple discrete common lines within each unit pixel, thereby maximizing the light-transmissive area while maintaining proper liquid crystal orientation through the unified common electrode
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 increases the aperture ratio and transmittance by up to 20% compared to conventional devices, particularly in high-resolution displays, by reducing the area occupied by common lines and preventing delays in common voltage application.
Implementation Method 1
liquid crystal molecules are driven by a fringe field created between the pixel electrode(s) and the common electrode(s)
Data Source
AI summary
Discussed are a liquid crystal display device and a method of fabricating the same in which a single common line is formed at the center of a substrate, which results in an enhanced aperture ratio and transmittance. The liquid crystal display device includes a single common line located at a center of a substrate; a first group of unit pixels located in a right portion of the substrate on the basis of the common line and a second group of unit pixels located in a left portion of the substrate on the basis of the common line, each unit pixel defined by a plurality of gate lines and data lines orthogonally intersecting each other; and a plurality of thin film transistors formed at a right side of the respective unit pixels of the first group and at a left side of the respective unit pixels of the second group.