Liquid Crystal Display Driving Method Using Adjacent Data Lines
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Solution Overview
Problem
Conventional liquid crystal display devices face issues such as reduced aperture ratio, flicker due to parasitic capacitance, horizontal crosstalk, DC offset voltage, afterimage generation, and increased heat and current consumption due to common voltage requirements and polarity inversion schemes.
Innovation Solution
A liquid crystal display device with liquid crystal cells driven by image signals supplied to two adjacent data lines, utilizing a thin film transistor and storage capacitor configuration, where first and second image signals with symmetrical voltage levels are used to eliminate the need for a common voltage supply and reduce power consumption, thereby eliminating horizontal crosstalk and afterimage issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common voltage supply line is used to apply common voltage to the opposite electrode of each liquid crystal cell, then the liquid crystal can be driven, but the aperture ratio of each liquid crystal cell is reduced
Solution Approach 1:
The invention extracts and removes the common voltage supply line from the liquid crystal display structure. By eliminating this separate supply line, the aperture ratio is increased while the common voltage is now supplied through the data line structure itself, maintaining driving capability without the area penalty of a dedicated common voltage line
Solution Approach 2:
The data line structure is given multiple functions: it serves both as a data signal transmission line and as a common voltage supply line. This multi-functionality eliminates the need for a separate common voltage supply line, thereby increasing the aperture ratio while maintaining full driving capability
2Object-affected harmful factors
If common voltage is adjusted to remove flicker caused by parasitic capacitance, then flicker is reduced, but the device complexity and control requirements increase
Solution Approach 1:
The invention converts the previously harmful kickback voltage effect into a beneficial mechanism. By intentionally designing the data line structure to supply common voltage, the kickback voltage that would normally cause flicker is now used as part of the driving mechanism, eliminating flicker without requiring complex voltage adjustments
Solution Approach 2:
Instead of adjusting the common voltage to compensate for parasitic capacitance effects, the invention inverts the approach by using the parasitic capacitance and kickback voltage effects as part of the driving mechanism. The data line structure is designed to leverage these effects rather than fight against them, simplifying the control system
3Reliability
If polarity inversion is implemented to reduce DC offset component, then liquid crystal deterioration is reduced, but afterimage is generated due to dominant polarity supply
Solution Approach 1:
The invention introduces asymmetry in the polarity inversion scheme by using odd and even data lines with different polarity patterns. This asymmetric arrangement ensures that no single polarity becomes dominant across the entire display, eliminating afterimage while maintaining the benefits of polarity inversion for reducing DC offset and preventing liquid crystal deterioration
4Ease of operation
If image signal voltage level is divided into positive and negative polarity based on common voltage, then liquid crystal can be driven, but the swing width of image signal increases, resulting in increased heat generation and current consumption
Solution Approach 1:
The invention changes the voltage parameter reference point from common voltage to a mid-range voltage level. By defining positive and negative polarities relative to this midpoint rather than using a wide swing around common voltage, the voltage amplitude is reduced, which directly decreases power consumption and heat generation in the data driving circuit while maintaining full liquid crystal driving capability
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 increases the aperture ratio of liquid crystal cells, reduces power consumption, and enhances picture quality by eliminating flicker and afterimage, while allowing for high-voltage driving to increase response speed and reduce heat generation in the data driving circuit.
Implementation Method 1
Each of the liquid crystal cells of the liquid crystal panel adjusts light transmittance of the liquid crystal based on an electric field formed by a potential difference between an image signal supplied to a corresponding data line and a common voltage applied to an opposite electrode
Data Source
AI summary
Disclosed herein are a liquid crystal display device which is capable of driving a liquid crystal using image signals supplied to two adjacent data lines, and a driving method thereof. The liquid crystal display device has a plurality of liquid crystal cells formed respectively in pixel areas defined by intersections of n gate lines and m data lines. Each of the liquid crystal cells includes a thin film transistor connected to any one of the gate lines and any one of two data lines adjacent respectively to left and right sides of a corresponding one of the liquid crystal cells, among the data lines, and a liquid crystal capacitor and a storage capacitor each formed between the other one of the two adjacent data lines and the thin film transistor.