Visibility Improvement Sheet with Rectangular Light Absorbing Portions

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Solution Overview

Problem

Conventional visibility improvement sheets for liquid crystal display devices face challenges in maintaining a broad view angle while improving contrast, as they often reduce diffused light and brightness due to their louver-type structure and oblique light absorption.

Innovation Solution

A method for manufacturing a visibility improvement sheet with light transparent and light absorbing portions, where the light absorbing portions have a substantially rectangular cross section and incorporate air bubbles at a predetermined ratio within an ink composition of transparent ionizing radiation curable resin and colored fine particles, which are cured to form light absorbing portions with an oblique side angle close to 0 degrees, maintaining a view angle and enhancing contrast.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a louver-type visibility improvement sheet with light shielding layers is used to improve contrast and prevent external light interference, then the peep preventive function and reflection preventive function are improved, but the brightness of the display screen is reduced due to cutting of diffused light

Engineering Contradiction:

Improveexternal light interferenceVSAvoiddisplay screen brightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The visibility improvement sheet is divided into alternating light transparent portions and light absorbing portions. The light absorbing portions have a substantially rectangular cross section with an oblique side angle close to 0 degrees, creating narrow-line-width structures that selectively absorb external light while preserving diffused image light transmission to the viewer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the sheet have different optical properties: light transparent portions allow light transmission for brightness, while light absorbing portions with rectangular cross sections and near-0 degree oblique sides provide targeted light absorption for contrast improvement. This local differentiation resolves the contradiction between brightness and contrast.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If light absorbing portions with substantially rectangular cross section and oblique side angle close to 0 degrees are formed to improve contrast, then the view angle is maintained, but the manufacturing precision becomes more difficult to control

Engineering Contradiction:

Improveimage reflectionVSAvoidrectangular cross section formation precision

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The oblique side angle of the rectangular cross section is set close to 0 degrees, which is a specific parameter change that optimizes the balance between contrast improvement and manufacturing feasibility. This parameter adjustment makes the formation of narrow-line-width light absorbing portions more controllable while maintaining the view angle and reducing image reflection.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the light absorbing portions are formed with narrow line width and substantially rectangular cross section to improve contrast, then the view angle is maintained, but the quantity of light absorbing material required increases

Engineering Contradiction:

Improveexternal light shieldingVSAvoidlight absorbing material quantity

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The light absorbing portions are formed using an ink composition that is cured to create the light absorbing material structure. This composite approach combines the rectangular cross-sectional geometry with the cured ink material properties to achieve effective light absorption with optimized material usage.

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 method achieves excellent contrast and maintains a view angle by forming light absorbing portions with air bubbles, ensuring that the visibility improvement sheet effectively regulates light and reduces external light interference, improving image visibility without compromising brightness.

Implementation Method 1

filling the grooves with a ink composition comprising a transparent ionizing radiation curable resin composition and colored fine particles; and curing the ink composition in such a state that fine air bubbles are randomly dispersed in the filled ink composition

Methodology Applied

Scientific EffectIonizing radiation curable: Photopolymerisation

Data Source

PatentUS9746588B2Method for manufacturing visibility improvement sheet, and visibility improvement sheet

Publication Date: 2017.08.29 DAI NIPPON PRINTING CO LTD

AI summary

Disclosed is a method for manufacturing a visibility improvement sheet that comprises light absorbing portions having a substantially rectangular cross-section and can realize a high contrast while maintaining a view angle. The visibility improvement sheet is manufactured by forming light transparent portions juxtaposed to each other at predetermined intervals to form grooves having a substantially rectangular cross section juxtaposed to each other between the light transparent portions, filling the grooves with an ink composition comprising a transparent ionizing radiation curable resin composition and colored fine particles, and curing the ink composition in such a state that fine air bubbles are randomly dispersed in the filled ink composition.