IPS LCD Electrode Segmentation for Aperture Ratio
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Solution Overview
Problem
In-Plane Switching (IPS) mode LCD devices face challenges with a low aperture ratio due to the wide interval between common and pixel electrodes, leading to deteriorated luminance and inability to utilize the upper portions as a driving area, similar to Fringe Field Switching (FFS) mode LCD devices.
Innovation Solution
The IPS mode LCD device features a decreased interval between common and pixel electrodes, with both electrodes formed of transparent conductive materials, allowing for a horizontal electric field generation and alignment of liquid crystal molecules similar to FFS mode, thereby improving aperture ratio and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the interval between common and pixel electrodes is increased to improve aperture ratio, then the aperture ratio is improved, but the driving voltage must be increased
Solution Approach 1:
The patent changes the physical configuration parameters of the electrode system by introducing multiple common electrodes and multiple pixel electrodes in an alternating pattern, rather than changing the voltage parameter. This structural parameter change allows the aperture ratio to be improved while maintaining lower driving voltage requirements through the distributed electrode configuration.
Solution Approach 2:
The patent segments the single common electrode into multiple common electrodes and the single pixel electrode into multiple pixel electrodes, arranged in an alternating pattern. This segmentation allows for better space utilization and improved aperture ratio while distributing the electrical field more efficiently, reducing the need for high driving voltage.
2Area of stationary object
If the interval between common and pixel electrodes is increased to improve aperture ratio, then the aperture ratio is improved, but the upper portions cannot be used as a driving area
Solution Approach 1:
By segmenting the electrodes into multiple common and pixel electrodes arranged alternately, the patent creates multiple smaller driving regions throughout the pixel area. This segmentation allows the upper portions and all intermediate spaces to become active driving areas, maximizing the utilization of the entire pixel region for liquid crystal switching.
Solution Approach 2:
The patent transitions from a single-pair electrode configuration to a multi-pair alternating electrode configuration, effectively utilizing the spatial dimension more efficiently. This dimensional reorganization allows the upper portions and intermediate regions to become functional driving areas, converting previously inactive spaces into active liquid crystal switching zones.
3Illumination intensity
If transparent conductive materials are used for both common and pixel electrodes, then light transmittance is improved, but the electrode structure becomes more complex
Solution Approach 1:
The patent applies universal transparent conductive material (such as ITO) to both common and pixel electrodes, making the material multi-functional. This eliminates the need for different materials with different optical properties, simplifying the overall electrode structure while maintaining high light transmittance across the entire display area.
Solution Approach 2:
The patent uses homogeneous transparent conductive material for both common and pixel electrodes, creating uniform optical and electrical properties throughout the electrode system. This homogeneity simplifies the electrode structure by eliminating material transitions and interfaces, while ensuring consistent light transmittance characteristics across all electrode regions.
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 enables the IPS mode LCD device to be driven with a lower voltage and improves light transmittance, aligning liquid crystal molecules across the entire area, enhancing the aperture ratio and luminance comparable to FFS mode LCD devices.
Implementation Method 1
a horizontal electric field is generated between the common and pixel electrodes
Implementation Method 2
the liquid crystal molecule is aligned in parallel to the substrate
Data Source
AI summary
An LCD device having an improved aperture ratio is disclosed. The LCD device includes first and second substrate facing each other; gate and data lines formed on the first substrate, wherein the gate and data lines are formed substantially perpendicularly with respect to each other to define a pixel region; common and pixel electrodes formed in the pixel region, wherein the common and pixel electrodes are arranged in an alternating pattern with an empty space therebetween, wherein a horizontal electric field is generated between the common and pixel electrodes; and a liquid crystal layer formed between the first and second substrates.