Parallel Polarizer IPS LCD Eliminates Yellow Tint
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Solution Overview
Problem
IPS mode TFT-LCDs operating in normally white mode face challenges in achieving wide view angles while representing full white gray-scale without a yellowish phenomenon, and require additional optical films like half wave plates, increasing manufacturing complexity and cost.
Innovation Solution
A wide view angle IPS mode TFT-LCD is designed with polarizers having parallel polarizing axes and liquid crystal molecules aligned parallel to these axes, eliminating the need for additional optical films by ensuring full white gray-scale representation without yellowish tint through in-plane switching mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If IPS mode TFT-LCD uses traditionally crossed polarizers configuration, then wide view angle is achieved, but yellowish phenomenon occurs and full white gray-scale cannot be represented
Solution Approach 1:
The patent inverts the conventional IPS mode configuration by using parallel polarizers instead of crossed polarizers. Specifically, the first polarizer and second polarizer are arranged with their polarizing axes parallel to each other, and the liquid crystal molecules are initially aligned parallel to these axes. This inversion allows the display to represent full white gray-scale without yellowish phenomenon while maintaining wide view angle capability.
2Object-affected harmful factors
If additional optical films like half wave plates are added to IPS mode TFT-LCD, then yellowish phenomenon is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for additional optical films (such as half wave plates) from the IPS mode TFT-LCD structure. By fundamentally changing the polarizer configuration to parallel arrangement with parallel liquid crystal alignment, the invention achieves yellowish phenomenon reduction without requiring extra optical components, thereby simplifying manufacturing and reducing cost.
Solution Approach 2:
The parallel polarizer configuration with parallel liquid crystal alignment serves multiple functions simultaneously: it eliminates yellowish phenomenon, maintains wide view angle, enables full white gray-scale representation, and removes the need for additional optical films. This multi-functional approach simplifies the overall device structure while achieving multiple performance goals.
3Object-affected harmful factors
If additional optical films like half wave plates are added to IPS mode TFT-LCD, then yellowish phenomenon is reduced, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the need for additional optical films (such as half wave plates) from the IPS mode TFT-LCD structure. By fundamentally changing the polarizer configuration to parallel arrangement with parallel liquid crystal alignment, the invention achieves yellowish phenomenon reduction without requiring extra optical components, thereby simplifying manufacturing and reducing cost.
4Device complexity
If TN mode is used for normally white mode operation, then simple structure is achieved, but wide view angle is not obtained
Solution Approach 1:
The patent merges the structural simplicity of TN mode with the wide view angle capability of IPS mode by using parallel polarizers and parallel liquid crystal alignment. This combination achieves both goals: the structure remains relatively simple like TN mode, while the view angle becomes wide like IPS mode, and additionally enables full white gray-scale representation without yellowish phenomenon.
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 allows for a simple, cost-effective manufacturing process that achieves full white gray-scale representation without yellowish tint, suitable for transparent, reflective, or semi-transparent display devices, particularly beneficial for outdoor use under sunlight conditions.
Implementation Method 1
The liquid crystal cells have the liquid crystal materials having the dielectic anisotropy and optical anisotropy
Implementation Method 2
The liquid crystal cells have the liquid crystal materials having the dielectric anisotropy and optical anisotropy
Implementation Method 3
The polarizers 21 and 23 make the incident light to be linearly polarized
Implementation Method 4
The liquid crystal molecules 41 are disposed in manner that liquid crystal molecules 41 are parallel but continuously twisted until the direction of the liquid crystal molecule near the upper substrate 11 and the direction of the liquid crystal molecule near the lower substrate 31 are crossed with 90 degrees
Implementation Method 5
a nematic phase liquid crystal layer is driven by In-Plane Switching method for having a wide view angle feature
Data Source
AI summary
The present disclosure relates to a wide viewing angle liquid crystal display device working in normally white mode. An wide viewing angle IPS mode TFT-LCD operating in a normally white mode comprises a first polarizer having a first polarizing axis parallel to a first direction; a second polarizer having a second polarizing axis parallel to the first direction; and liquid crystal molecules disposed between the first polarizer and the second polarizer, and having an initial alignment direction parallel to the first direction. The wide view angle IPS mode TFT-LCD according to the present disclosure is a operating in normally white mode which represents full white gray-scale without yellowish phenomenon, and does not need any additional optical film for overcoming the yellowish phenomenon so that the manufacturing process is simply and cost is lower than the LCD according to the related art.