In-Plane Switching LCD Tilt Angle and Retardation Control
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Solution Overview
Problem
Liquid crystal display devices with in-plane switching mode suffer from significant light leak and tint changes when viewed from oblique directions during black display, limiting their viewing angle and color accuracy.
Innovation Solution
A liquid crystal display device configuration featuring a liquid crystal cell with controlled alignment and a specific arrangement of polarizing plates, color filters, and optical compensation layers, where the tilt angle of the liquid crystal compound is 1.0° or less, and the color filters have tailored thickness-direction retardations to minimize light leak and tint changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an in-plane switching mode liquid crystal display device is used, then the viewing angle is improved, but light leak and tint changes occur when viewed from oblique directions during black display
Solution Approach 1:
The invention changes the tilt angle parameter of the liquid crystal compound to 1.0° or less, and adjusts the thickness-direction retardation parameters of the color filters to specific ranges. These parameter modifications resolve the contradiction by maintaining the in-plane switching mode's wide viewing angle advantage while suppressing light leak and tint changes through precise control of optical parameters.
Solution Approach 2:
The invention employs a composite structure combining the liquid crystal layer with specifically designed color filters that have tailored thickness-direction retardation characteristics. This composite approach allows the system to achieve both wide viewing angle and suppression of oblique-direction display defects by combining materials with complementary optical properties.
2Object-affected harmful factors
If the tilt angle of liquid crystal compound is reduced to suppress light leak, then black display quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
By setting the tilt angle parameter to 1.0° or less and defining specific ranges for thickness-direction retardation, the invention establishes clear manufacturing targets. These parameter specifications enable manufacturers to achieve the desired light leak suppression while maintaining feasible manufacturing precision through controlled parameter variations within the specified ranges.
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
The proposed configuration effectively suppresses light leak and tint changes when viewed from oblique angles during black display, enhancing the viewing angle and color accuracy of the liquid crystal display device.
Implementation Method 1
a liquid crystal layer which is disposed between the pair of substrates and includes a liquid crystal compound with controlled alignment
Implementation Method 2
an electric field including a component that is parallel to at least one of the substrates including an electrode is formed by the electrode
Implementation Method 3
a pair of polarizing plates that are disposed such that the liquid crystal cell is interposed between the pair of polarizing plates
Implementation Method 4
the polarizing plate that is disposed on the visible side among the pair of polarizing plates includes an optical compensation layer
Implementation Method 5
a first color filter that is disposed on the first pixel region of the liquid crystal cell, a second color filter that is disposed on the second pixel region of the liquid crystal cell, and a third color filter that is disposed on the third pixel region of the liquid crystal cell are disposed between the pair of polarizing plates on a visible side further than the liquid crystal cell
Data Source
AI summary
A liquid crystal display device in which light leak and a tint change when being seen from an oblique direction at the time of black display are suppressed. The liquid crystal display device includes: a liquid crystal cell and a pair of polarizing plates that are disposed such that the liquid crystal cell is interposed between the pair of polarizing plates, in which a tilt angle of the liquid crystal compound is 1.0° or less, respective color filters that are disposed on respective pixel regions of the liquid crystal cell are provided between the pair of polarizing plates, Rth of the respective color filters satisfy predetermined requirements, the polarizing plate that is disposed on the visible side among the pair of polarizing plates includes an optical compensation layer and a polarizer in this order from the liquid crystal cell side, and the optical compensation layer satisfies a predetermined requirement.