Liquid Crystal Display Phase Difference Compensation
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Solution Overview
Problem
Existing liquid crystal display devices, particularly those using the Twist Nematic method, suffer from limited view angles due to uncompensated phase difference anisotropy, leading to unsatisfactory visibility when viewed from directions other than directly front, and previous solutions complicate the structure or result in light leakage and reduced contrast.
Innovation Solution
A liquid crystal display device configuration featuring a liquid crystal layer sandwiched between transparent substrates, with diagonal or hybrid oriented liquid crystal molecules and a positive uniaxial phase difference film arranged between the liquid crystal layer and polarization plates, ensuring orthogonal orientation of the liquid crystal film and phase difference film components to compensate for phase differences and enhance view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If two anisotropic films are arranged with orthogonal optical axes to compensate phase difference in the diagonal direction, then the view angle is enlarged, but the anisotropy of the phase difference caused by the rising direction of the liquid crystal cannot be compensated
Solution Approach 1:
The patent uses a composite structure combining a liquid crystal layer with positive dielectric anisotropy and an optical compensation film with negative dielectric anisotropy. This composite material approach allows the phase difference anisotropy in the rising direction to be compensated, which cannot be achieved with single anisotropic films alone.
Solution Approach 2:
The patent changes the dielectric anisotropy parameter from positive (liquid crystal layer) to negative (optical compensation film) to compensate for the phase difference anisotropy. This parameter inversion enables complete compensation of both diagonal and rising direction phase differences.
2Shape
If VA or IPS methods are used to improve view angle, then the liquid crystal molecules are oriented vertically or homogeneously, but the structure becomes complicating and yield lowers
Solution Approach 1:
The patent introduces an optical compensation film as an intermediary layer between the liquid crystal layer and the polarization plate. This mediator compensates for view angle limitations without requiring complex molecule orientation structures, maintaining simplicity while improving performance.
Solution Approach 2:
The patent changes the dielectric anisotropy parameter of the compensation film to be negative, which allows simple TN structure to achieve wide view angle without complex orientation mechanisms required by VA or IPS methods.
3Device complexity
If TN liquid crystal method is used, then the structure is simple, but black and white reverses when seen from directions other than front due to narrow view angle
Solution Approach 1:
The patent combines TN liquid crystal layer with negative dielectric anisotropy optical compensation film, creating a composite structure that maintains TN simplicity while achieving wide view angle through the complementary properties of the two materials.
Solution Approach 2:
The patent converts the harmful effect of phase difference anisotropy in the rising direction into a beneficial compensation mechanism. The negative dielectric anisotropy of the compensation film compensates for the positive dielectric anisotropy of the liquid crystal layer, turning a limitation into an advantage.
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 effectively compensates for phase differences and anisotropy, achieving a wide view angle and improved visibility without complicating the structure, while maintaining high contrast and minimizing light leakage during black displays.
Implementation Method 1
liquid crystal molecules having positive dielectric anisotropic property
Implementation Method 2
electric field for display
Implementation Method 3
optical anisotropy does not arise in plane and negative anisotropy arise in a direction perpendicular to the film plane
Implementation Method 4
the phase difference in the diagonal direction that occurs when electric field is applied between the transparent electrodes and the liquid crystal molecules
Implementation Method 5
a first polarization plate and a second polarization plate are respectively arranged on the side opposite to the liquid crystal layer
Data Source
AI summary
The present invention aims to provide a liquid crystal display device capable of realizing a wide view angle. A liquid crystal display device includes a liquid crystal film in which the liquid crystal molecules having positive dielectric anisotropy are diagonal oriented or hybrid oriented and a uniaxial film are arranged between the liquid crystal layer and at least one polarization plate, the orientation direction of the liquid crystal layer and the liquid crystal film are substantially the same, and the tilt direction of the liquid crystal molecules on the liquid crystal layer side of the liquid crystal film and the tilt direction of the liquid crystal molecules on the liquid crystal film side of the liquid crystal layer are substantially the same.