Liquid Crystal Display Common Voltage Grid Design
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving uniform common voltage distribution, particularly in large-scale panels, leading to image quality deterioration, afterimages, wire breakage, and crosstalk due to resistance issues in common lines.
Innovation Solution
The implementation of a liquid crystal display device design that includes multiple data pad portions with data and common pad lines, first and second data driver ICs, and common voltage input terminals to supply common voltage via second common lines parallel to data lines, along with common voltage delay restrictors to prevent voltage delay phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single horizontal common line is used to supply common voltage, then the device structure is simple, but uniform voltage distribution cannot be achieved in large-scale panels due to resistance
Solution Approach 1:
The single horizontal common line is segmented into multiple common lines (first common line and second common line) that extend in different directions. The first common line extends horizontally from the left side, while the second common line extends vertically from the bottom side, creating a grid-like distribution network that reduces resistance and improves voltage uniformity across large panels.
Solution Approach 2:
The common voltage distribution is extended from a single horizontal dimension to multiple dimensions by adding the second common line that extends vertically. This multi-directional approach creates a two-dimensional voltage distribution network, effectively reducing resistance and improving uniformity across the panel surface.
2Area of stationary object
If the panel has longer horizontal length for television use, then the display area is increased, but the resistance of the common line increases leading to wire breakage and crosstalk
Solution Approach 1:
The long horizontal path for common voltage supply is segmented by introducing a vertical component through the second common line. This segmentation breaks the long horizontal resistance path into shorter segments, reducing overall resistance and the risk of wire breakage and crosstalk in large television panels.
Solution Approach 2:
A vertical dimension is added to the common line structure through the second common line extending from the bottom side. This creates a multi-dimensional voltage distribution network that reduces the effective resistance path length, preventing wire breakage and crosstalk even in panels with extended horizontal dimensions for television applications.
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 design ensures more uniform common voltage distribution across the display panel, enhancing image quality and reducing the likelihood of wire breakage and crosstalk, while maintaining efficient circuit operation.
Implementation Method 1
a liquid crystal material, exhibiting dielectric anisotropy and refractive index anisotropy, is arranged between two electrodes. After an electric field is generated between the two electrodes, strength of the electric field is adjusted to control transmission of light
Implementation Method 2
a liquid crystal material, exhibiting dielectric anisotropy and refractive index anisotropy, is arranged between two electrodes
Data Source
AI summary
A liquid crystal display device having uniform common voltage distribution within a display panel (10) is disclosed. The liquid crystal display device includes a display panel (10) including a display area (12) and a non-display area (14) surrounding the display area (12), a plurality of gate lines (22) and data lines (24) arranged on the display area (10) to intersect each other, so as to define a plurality of pixel regions (20), thin-film transistors (21) formed at respective intersections of the gate lines (22) and the data lines (24), pixel electrodes formed on the respective pixel regions and connected to the thin film transistors, a plurality of first common lines (30) provided between the neighboring gate lines and arranged parallel to the gate lines (22), and a plurality of second common lines (32) provided between the neighboring data lines and arranged parallel to the data lines (24), the second common lines (32) being electrically connected to the first common lines (30).