IPS LCD Electrode Segmentation for Light Transmissivity
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Solution Overview
Problem
In-plane switching mode liquid crystal displays (IPS LCDs) face limitations in achieving high light transmissivity due to the narrow viewing angle and reduced light transmissivity when the in-plane electric field strength increases, as liquid crystal molecules tend to align at angles greater than 45 degrees with the rubbing direction.
Innovation Solution
The design includes a substrate configuration with pixel and common electrodes forming domains, where the first and second pixel electrode portions and common electrode portions are arranged at angles greater than 90 degrees, inducing symmetrical first and second in-plane electric fields that align liquid crystal molecules at approximately 45 degrees to the rubbing direction, maximizing light transmissivity and compensating display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the in-plane electric field strength is increased to improve response speed, then the response speed is improved, but the liquid crystal molecules align at angles greater than 45 degrees with the rubbing direction, reducing light transmissivity
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode portion, second pixel electrode portion, third pixel electrode portion) arranged at different orientations. This segmentation creates multiple electric field directions that work together to maintain liquid crystal alignment at approximately 45 degrees to the rubbing direction even under strong driving voltages, thereby preserving light transmissivity while achieving fast response speed.
Solution Approach 2:
The pixel electrode segments are designed with asymmetric orientations relative to the rubbing direction and to each other. Specifically, the first pixel electrode portion is oriented at a first angle, the second at a second angle, and the third at a third angle, creating an asymmetric electric field distribution that optimizes both response speed and light transmissivity by preventing excessive alignment angles.
2Adaptability or versatility
If the viewing angle is increased by using IPS mode, then the viewing angle is improved, but the light transmissivity is reduced due to molecular alignment at angles greater than 45 degrees
Solution Approach 1:
The pixel electrode is segmented into multiple portions with different orientations to create a more uniform electric field distribution across the pixel region. This segmentation ensures that liquid crystal molecules align at approximately 45 degrees to the rubbing direction throughout the entire pixel, maintaining high light transmissivity while achieving wide viewing angles characteristic of IPS mode displays.
Solution Approach 2:
Different segments of the pixel electrode are oriented at different angles to optimize the electric field distribution in different local regions of the pixel. This local optimization ensures that throughout the entire pixel region, the liquid crystal molecules maintain the optimal 45-degree alignment angle, thereby preserving light transmissivity while achieving wide viewing angles.
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 light transmissivity and increases the viewing angle by ensuring liquid crystal molecules align optimally with the electric fields, even when the fields are stronger, thereby improving display performance.
Implementation Method 1
A voltage applied across the electrodes induces an electric field in the liquid crystal material layer. An alignment of liquid crystal molecules within the liquid crystal material layer is changed in accordance with an intensity or direction of the induced electric field
Implementation Method 2
Liquid crystal molecules of the liquid crystal material layer are arranged along a rubbing direction RD of the alignment layer (not shown) in an initial stage
Data Source
AI summary
A liquid crystal display includes a pixel electrode connected with a thin film transistor and including at least one first pixel electrode portion and at least one second pixel electrode portion, a first angle between the first pixel electrode portion and the second pixel electrode portion being greater than 90 degrees, and a common electrode including at least one first common electrode portion and at least one second common electrode portion, a second angle between the first common electrode portion and the second common electrode portion is greater than 90 degrees, wherein the at least one first and second pixel electrode portions, and the at least one first and second common electrode portions define at least one domain.