Common Electrode Line for FFS LCD Signal Delay
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Solution Overview
Problem
High aperture ratio fringe-field switching (FFS) liquid crystal displays (LCDs) suffer from significant signal delay and crosstalk due to the high capacitance between the common and pixel electrodes, which affects picture quality and is exacerbated by the common electrode's slit structure, leading to increased resistance and reduced loading ability of the common voltage signal.
Innovation Solution
The introduction of a common electrode line in the pixel region, connected to the common electrode, forms a parallel circuit that reduces the overall resistance of the common electrode, thereby alleviating signal delay and improving the loading ability of the common voltage signal, and is achieved through the use of contact via holes or direct overlap connections with the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the common electrode is designed with slits to achieve high aperture ratio, then the aperture ratio is improved, but the resistance of the common electrode increases and signal delay worsens
Solution Approach 1:
The common electrode is divided into multiple independent electrode regions separated by slits, allowing each region to be driven independently. This segmentation reduces the effective resistance path within each electrode region while maintaining high aperture ratio.
Solution Approach 2:
A common electrode line is introduced as an intermediary conductive structure that connects to the common electrode through contact holes. This intermediary provides an additional current path that reduces the overall resistance and signal delay of the common electrode system.
2Area of moving object
If the common electrode is designed with slits to achieve high aperture ratio, then the aperture ratio is improved, but crosstalk increases due to reduced loading ability
Solution Approach 1:
The common electrode line acts as an intermediary that provides additional current paths through contact holes, enhancing the loading ability of the common voltage signal and reducing crosstalk between adjacent pixels.
Solution Approach 2:
The resistance parameter of the common electrode is changed by introducing the common electrode line with lower resistance, which improves the RC time constant and reduces signal delay and crosstalk.
3Area of moving object
If the capacitance between common electrode and pixel electrode is increased in FFS mode, then the aperture ratio is improved, but the signal delay increases due to reduced loading ability
Solution Approach 1:
The common electrode line serves as an intermediary conductive path that compensates for the increased capacitance loading by providing additional current paths, thereby maintaining signal integrity and reducing delay.
Solution Approach 2:
The problem is solved by adding a new dimensional element (the common electrode line extending in a different spatial dimension) that provides alternative current paths and reduces the effective resistance-capacitance product.
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 solution effectively reduces the RC signal delay and enhances the picture quality by improving the loading ability of the common voltage signal, thereby alleviating crosstalk and maintaining the transmittance of the liquid crystal panel.
Implementation Method 1
The introduction of a common electrode line in the pixel region, connected to the common electrode, forms a parallel circuit that reduces the overall resistance of the common electrode, thereby alleviating signal delay
Implementation Method 2
capacitance formed between a common electrode and a pixel electrode is an important factor for the common electrode to generate signal delay, and the amount of the capacitance can refer to the calculating formula: C=∈r∈0*S/d
Implementation Method 3
The common electrode 13 with slits and the underlying pixel electrode 11 together form a horizontal electric field 70 when applied a voltage therebetween. The electric field 70 can rotate the liquid crystal molecules
Implementation Method 4
The electric field 70 can rotate the liquid crystal molecules, which are horizontally arranged between the array substrate 50 and the color film substrate 60, to function as a light valve
Data Source
AI summary
The disclosed technology relates to an array substrate and a method of manufacturing the same, and a liquid crystal display. The array substrate comprises a base substrate. The base substrate comprises a pixel region and a peripheral region; data lines and gate lines are formed to transversely and longitudinally cross each other on the base substrate to form a plurality of pixel units, and each of the pixel units comprises a switching element, a pixel electrode and a common electrode above the pixel electrode; the common electrode has slits in each pixel unit and is a plate-shaped electrode in the pixel region, when powered on, the common electrode forms a horizontal electric field together with the pixel electrode of the pixel unit; and a common electrode line fouled in the pixel region and connected with the common electrode.