LCD Electrode Segmentation for Viewing Angle and Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCD devices, such as TN mode, IPS mode, and FFS mode, face challenges with narrow viewing angles, low aperture ratios, and slow response speeds due to inadequate electrode configurations, leading to issues like afterimages and reduced light transmittance.
Innovation Solution
The proposed LCD device features a unique electrode configuration with first and second substrates having gate and data lines crossing to define a pixel region, including plate-shaped common electrodes and symmetrically arranged pixel electrodes at fixed intervals, forming both fringe and in-plane electric fields to improve liquid crystal molecule alignment and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TN mode LCD device uses two electrodes on two substrates with 90° twist alignment, then contrast and resolution are improved, but viewing angle becomes narrow
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode and second pixel electrode) that are spatially separated and independently controlled. This segmentation allows different regions to serve different functions: one region optimizes for contrast while another region optimizes for viewing angle, resolving the contradiction between these two parameters
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties. The first pixel electrode region is optimized for vertical alignment to improve contrast, while the second pixel electrode region is optimized for horizontal alignment to widen viewing angle. Each local region has specialized characteristics tailored to its specific function
2Adaptability or versatility
If IPS mode LCD device uses electrodes on one substrate with in-plane switching, then viewing angle is widened, but aperture ratio decreases
Solution Approach 1:
The common electrode is segmented into first and second common electrodes that are positioned at different locations and orientations. This segmentation allows the electric field to be distributed more efficiently, reducing the area occupied by electrode structures while maintaining wide viewing angle performance through coordinated operation of multiple electrode segments
Solution Approach 2:
The electrode configuration transitions from a single-plane arrangement to a multi-dimensional spatial distribution. Electrodes are arranged in different layers and orientations (first common electrode in first direction, second common electrode in second direction), utilizing three-dimensional space to reduce footprint and improve aperture ratio while maintaining wide viewing angle
3Adaptability or versatility
If FFS mode LCD device uses fringe field between common and pixel electrodes, then viewing angle is improved, but response speed becomes slow
Solution Approach 1:
The liquid crystal molecules undergo periodic reorientation in response to the alternating electric fields generated by the segmented electrode structure. The first and second pixel electrodes, along with their corresponding common electrodes, create a time-varying fringe field pattern that periodically drives the liquid crystal, enhancing response speed while maintaining wide viewing angle through the periodic nature of the field distribution
Solution Approach 2:
The electrode system functions as a composite structure combining multiple electrode types (first pixel electrode, second pixel electrode, first common electrode, second common electrode) with different orientations and positions. This composite electrode configuration creates a complex fringe field pattern that simultaneously achieves wide viewing angle and rapid response by leveraging the synergistic effects of multiple electrode interactions
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 enhances the aperture ratio, light transmittance, and response speed while widening the viewing angle, achieving better performance compared to traditional IPS mode LCD devices by combining fringe and in-plane electric fields.
Implementation Method 1
forming both fringe and in-plane electric fields to improve liquid crystal molecule alignment
Implementation Method 2
the fringe field is formed between the pixel electrode 9a and the counter electrode 2, wherein the fringe field is formed with the electric field being curved
Data Source
AI summary
A liquid crystal display device includes first and second substrates, gate and data lines formed on the first substrate and crossing each other to define a pixel region, a first common electrode in a first part of the pixel region, the first common electrode having a plate shape, a plurality of first pixel electrodes directly over the first common electrode and at a first fixed interval in the first part of the pixel region, a second pixel electrode alternately arranged with a second common electrode at a second fixed interval in a second part of the pixel region, and a layer of liquid crystal molecules between the first and second substrates.