In-Plane Switching LCD Multi-Domain Electrode Gap Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-plane switching mode liquid crystal display devices face limitations in aperture ratio, brightness, and viewing angle due to the uniform gap distances between common and pixel electrodes, which affect the electric field strength and image quality.
Innovation Solution
The introduction of a multi-domain structure in the pixel region by varying the gap distances between adjacent common and pixel electrodes, allowing for different block widths that adjust the electric field distribution and reduce driving voltage, thereby improving aperture ratio, brightness, and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform gap distances are used between common and pixel electrodes, then the device structure is simple and easy to manufacture, but the aperture ratio and brightness are limited
Solution Approach 1:
The patent applies local quality by varying the gap distances between common and pixel electrodes in different regions of the pixel area. Specifically, the gap distance is made smaller in regions where higher electric field strength is needed and larger in other regions, optimizing both aperture ratio and brightness while maintaining manufacturability through systematic variation rather than complete redesign
2Ease of manufacture
If uniform gap distances are used between common and pixel electrodes, then the manufacturing process is simple, but the viewing angle is narrow
Solution Approach 1:
The patent implements local quality by creating different gap distance configurations in different pixel regions, which generates varied electric field distributions that improve viewing angle characteristics. This systematic variation in gap distances allows the device to maintain ease of manufacture while achieving wider viewing angles through optimized local electric field patterns
3Device complexity
If uniform gap distances are used between common and pixel electrodes, then the device structure is simple, but the brightness is insufficient
Solution Approach 1:
The patent applies local quality by optimizing gap distances in specific regions to enhance electric field strength where it is most needed for brightness improvement. By making gap distances smaller in certain areas, the patent increases light transmission and brightness without requiring complete structural redesign, thus maintaining reasonable device complexity while significantly improving brightness performance
4Area of stationary object
If larger gap distances are used between common and pixel electrodes, then the aperture ratio increases, but the electric field strength decreases
Solution Approach 1:
The patent resolves this contradiction by applying local quality - using larger gap distances in regions where aperture ratio is prioritized while using smaller gap distances in regions where electric field strength is critical. This spatial variation allows simultaneous optimization of both aperture ratio and electric field strength, preventing the uniform gap design from forcing a trade-off between these two parameters
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 approach enhances the aperture ratio and brightness by optimizing the electric field distribution and reduces power consumption and response time, while expanding the viewing angle through the formation of distinct domains.
Implementation Method 1
the LCD device uses the optical anisotropy and polarization properties of liquid crystal molecules to produce an image. Due to the optical anisotropy of the liquid crystal molecules, refraction of light incident onto the liquid crystal molecules depends upon the alignment direction of the liquid crystal molecules
Implementation Method 2
the LCD device uses the optical anisotropy and polarization properties of liquid crystal molecules to produce an image
Implementation Method 3
The alignment direction of the liquid crystal molecules can be controlled by applying an electric field. Accordingly, the alignment of the liquid crystal molecules changes in accordance with the direction of the applied electric field
Implementation Method 4
In the horizontal portion of the electric field 'L' between the pixel electrode 30 and the common electrode 17, second liquid crystal molecules 11b of the liquid crystal layer 11 are horizontally re-aligned with the electric field 'L.' Thus, a phase transition of the liquid crystal layer 11 occurs in the horizontal portion of the electric field 'L.'
Data Source
AI summary
An array substrate for an in-plane switching mode liquid crystal display devices includes: a substrate; a gate line and a data line on the substrate, the gate line crossing the data line to define a pixel region; a common line parallel to the gate line; a thin film transistor connected to the gate line and the data line; a plurality of common electrodes extending from the common line, and a plurality of pixel electrodes alternating with the plurality of common electrodes, wherein a gap distance is defined as a width of a block by the adjacent common and pixel electrode in the pixel region, and at least one gap distance is different from the other gap distances.