Integrated Polarizer for IPS-LCD View Angle Compensation

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Solution Overview

Problem

Conventional view angle compensating films for IPS-LCDs are thick, costly, and fail to adequately compensate for phase retardation across various view angles, leading to low contrast ratios and color issues.

Innovation Solution

An integrated polarizer is developed, comprising a polarizing film with a +A plate coated with a +C plate in the form of liquid crystals, where the +A plate has in-plane phase retardation of 30 to 500 nm and the +C plate has thickness-direction phase retardation of 60 to 100 nm, both serving as a protective film to reduce panel thickness and manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional view angle compensating films are used, then phase retardation compensation is achieved, but the films are thick, costly, and fail to adequately compensate for phase retardation across various view angles

Engineering Contradiction:

Improvephase retardation compensationVSAvoidfilm thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent combines the view angle compensating film with the protective film into a single integrated structure. The protective film is designed to have both protective functions and view angle compensation functions, eliminating the need for separate thick compensating films. This merging reduces overall thickness while maintaining compensation effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The protective film is designed to serve multiple functions: it protects the polarizing film and simultaneously compensates for phase retardation across various view angles. By making the protective film multi-functional, the patent eliminates the need for additional dedicated compensating films, thereby reducing thickness and cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If conventional view angle compensating films are used, then phase retardation compensation is achieved, but manufacturing costs increase

Engineering Contradiction:

Improvephase retardation compensationVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By merging the compensating function into the existing protective film structure, the patent eliminates the need for separate compensating film manufacturing and assembly steps. This integration reduces material costs and manufacturing complexity while maintaining compensation performance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The protective film performs multiple functions including protection and view angle compensation, eliminating the need for additional dedicated compensating films. This multi-functionality reduces material requirements and manufacturing steps, thereby lowering overall manufacturing costs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If conventional view angle compensating films are used, then phase retardation compensation is achieved, but contrast ratios and color characteristics are degraded

Engineering Contradiction:

Improvephase retardation compensationVSAvoidcontrast ratio and color characteristics

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes the refractive index and thickness parameters of the integrated protective film to achieve effective phase retardation compensation. By carefully selecting and adjusting these parameters, the film compensates for phase retardation while maintaining high contrast ratios and accurate color characteristics.

Inventive Principle:

Principle #35Parameter changes

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 integrated polarizer effectively compensates for phase retardation, improving contrast ratios and color characteristics while reducing the overall thickness and manufacturing costs of IPS-LCDs.

Implementation Method 1

the +A plate has in-plane phase retardation of 30 to 500 nm and the +C plate has thickness-direction phase retardation of 60 to 100 nm

Methodology Applied

Scientific EffectBirefringence: Birefringence

Implementation Method 2

an in-plane switching liquid crystal display (IPS-LCD) filled with liquid crystal (Δ∈>0) having positive dielectric anisotropy

Methodology Applied

Scientific EffectDielectric anisotropy: Dielectric Permittivity

Data Source

PatentUS8368849B2Polarizing plate with built-in viewing angle compensation film and IPS-LCD comprising same

Publication Date: 2013.02.05 SHANJIN OPTOELECTRONICS (SUZHOU) CO LTD

AI summary

There is provided a polarizer integrally containing view angle compensating film used in an in-plane switching liquid crystal display (IPS-LCD) filled with liquid crystal (Δ∈>0) having positive dielectric anisotropy and an in-plane switching liquid crystal display comprising the same. More particularly, there is provided an integrated polarizer capable of being used to manufacture a thin polarizer and securing a good view angle by employing a view angle compensating film as a protective film of a polarizing film forming the polarizer and an IPS-LCD comprising the same. The integrated polarizer comprises a polarizing film; a protective film attached to one surface of the polarizing film; and a +A plate coated with a +C plate attached to the other surface of the polarizing film. The +C plate is coated in the form of liquid crystals.