Viewing Angle Compensation Film With Inclined Protrusions

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Solution Overview

Problem

Liquid crystal display devices face challenges in maintaining clear images when viewed from directions other than the front, particularly in vehicles where the display and driver's line of sight are not parallel, leading to issues with viewing angle and contrast ratio.

Innovation Solution

A method for manufacturing a viewing angle compensation film with a pattern layer having a flat surface and protruding portions featuring inclined surfaces, which is laminated onto a polarizer to improve the viewing angle and contrast ratio of the display device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional flat polarizing plate is used, then the manufacturing process is simple, but the viewing angle and contrast ratio deteriorate when viewed from directions other than the front

Engineering Contradiction:

Improveviewing angle and contrast ratioVSAvoidstructure of polarizing plate

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating protruding portions with inclined surfaces at specific locations on the polarizing plate surface. These localized structural modifications change the refraction characteristics only in specific areas, enabling viewing angle compensation without requiring complete structural redesign of the entire plate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs asymmetry by designing protruding portions with inclined surfaces that have asymmetric geometries. The inclined surfaces are configured with specific angles and orientations that differ from symmetric counterparts, creating directional light refraction effects that compensate for viewing angle limitations in specific directions.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If the polarizing plate structure is modified to improve viewing angle, then the viewing angle and contrast ratio improve, but the manufacturing complexity increases

Engineering Contradiction:

Improveviewing angle and contrast ratioVSAvoidmanufacturing process of polarizing plate

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by pre-forming the protruding portions with inclined surfaces on the polarizing plate during the manufacturing process. This preliminary structural preparation enables subsequent adhesive bonding and assembly steps to proceed efficiently, rather than requiring complex post-processing to create the viewing angle compensation effect.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes thin film technology by forming the protruding portions as surface features on a thin polarizing plate substrate. This approach maintains the flexibility and thinness of the overall structure while incorporating the complex inclined surface geometry needed for viewing angle compensation, avoiding the need for thick or rigid components.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If a pattern layer with protruding portions is added to the polarizing plate, then the viewing angle compensation effect improves, but the number of manufacturing steps increases

Engineering Contradiction:

Improveviewing angle compensation effectVSAvoidmanufacturing efficiency of polarizing plate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies merging by combining the pattern layer formation with the polarizing plate manufacturing process itself. The protruding portions are created as integral features during plate production rather than as separate subsequent steps, merging multiple functions into a single manufacturing flow and improving productivity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs composite materials by combining the polarizing plate substrate with a pattern layer that has different optical and mechanical properties. This composite structure integrates the light-polarizing function with the viewing angle compensation function in a single manufactured component, achieving multiple effects simultaneously.

Inventive Principle:

Principle #40Composite materials

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 solution enhances the viewing angle and contrast ratio of liquid crystal display devices, particularly in non-front viewing angles, by adjusting the refraction angle of light through the patterned film, thereby improving image clarity in diverse display orientations.

Implementation Method 1

adjusting the refraction angle of light through the patterned film

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12124066B2Method for manufacturing viewing angle compensation film, method for manufacturing polarizing plate, viewing angle compensation film, polarizing plate, and display device including same

Publication Date: 2024.10.22 LG CHEM LTD

AI summary

Provided is a method of manufacturing a viewing angle compensation film, comprising the steps of preparing a base and forming a pattern layer on the base, wherein the pattern layer comprises a first surface comprising a flat surface and a second surface opposite to the first surface; the second surface comprises multiple protruding portions, each of the protruding portions includes a first inclined surface and a second inclined surface, and the angle θ formed by the first inclined surface and the second inclined surface is 20° to 60°. Also provided are a method of manufacturing a polarizing plate by using a viewing angle compensation film manufactured by the manufacturing method, a viewing angle compensation film, a polarizing plate, and a display device including same.