Liquid Crystal Display Device with Segmented Common Lines
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Solution Overview
Problem
Conventional liquid crystal display devices experience picture quality issues such as flicker due to uneven voltage distribution across liquid crystal cells, leading to increased power consumption and costs, and require a separate common line which reduces aperture.
Innovation Solution
The liquid crystal display device employs a configuration where odd and even numbered liquid crystal cells on the same horizontal line are driven by different gate lines, with data signals supplied through zigzag arranged thin film transistors, reducing the required reference voltage by half and eliminating the need for a separate common line, thereby compensating for voltage differences and improving aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed common voltage is supplied to all liquid crystal cells through a common line, then the device structure is simple, but picture quality deteriorates due to voltage differences at different positions causing flicker
Solution Approach 1:
The invention divides the common voltage supply into multiple segments by providing separate common lines for odd-numbered and even-numbered liquid crystal cells. This segmentation allows independent voltage control for different cell groups, compensating for position-dependent voltage differences and eliminating flicker while maintaining structural simplicity.
2Reliability
If a separate common line is provided for each liquid crystal cell to compensate voltage differences, then picture quality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of providing separate common lines for each individual cell, the invention segments the common lines into two groups (odd and even cells), achieving voltage compensation with minimal additional structure.
Solution Approach 2:
The odd and even common lines serve multiple functions: they provide common voltage to their respective cell groups and simultaneously compensate for position-dependent voltage differences, eliminating the need for additional compensation circuits.
3Reliability
If the common voltage is adjusted for each position, then picture quality is improved by eliminating flicker, but power consumption and manufacturing cost increase
Solution Approach 1:
The invention segments the common voltage supply into odd and even groups, achieving position-based voltage compensation without requiring complex adjustable circuits for each cell. This reduces power consumption compared to fully adjustable systems while eliminating flicker.
4Reliability
If a separate common line is provided for each liquid crystal cell, then voltage compensation is achieved, but aperture ratio decreases due to additional line structures
Solution Approach 1:
The invention segments the common line structure into only two groups (odd and even cells) instead of providing individual lines for each cell. This minimal segmentation achieves voltage compensation while occupying minimal additional space, thereby maximizing the aperture ratio.
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 reduces power consumption and costs by lowering the data voltage level, compensates for voltage differences across liquid crystal cells, and enhances picture quality by eliminating flicker and increasing aperture.
Implementation Method 1
the liquid crystal display device displays a picture by controlling a light transmittivity of liquid crystals having dielectric anisotropy with an electric field
Implementation Method 2
a horizontal field type liquid crystal display device drives the liquid crystals in an in-plane switch mode with a horizontal electric field formed between pixel electrodes and a common electrode
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel having liquid crystal cells, a gate driver for driving gate lines of the liquid crystal display panel, a data driver for driving a first to (2m+1)th data lines of the liquid crystal display panel, wherein the liquid crystal display panel includes first thin film transistors connected to odd numbered data lines arranged on each horizontal line in zigzag with reference to the odd numbered data lines, second thin film transistors connected to even numbered data lines arranged on each horizontal line in zigzag with reference to the even numbered data lines, pixel electrode connected to the first thin film transistor for having a first data signal supplied thereto through the odd numbered data lines, and a common electrode connected to the second thin film transistor for having a second data signal supplied thereto through the even numbered data line and forming a horizontal electric field together with the pixel electrode.