Optical Composite Film for VA Display Color Shift and Thickness

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Solution Overview

Problem

Large-sized vertical alignment (VA) liquid crystal display panels suffer from significant color shift and reduced picture quality at large viewing angles due to rapid brightness saturation, and their thickness is increased by thick polarizing plates.

Innovation Solution

An optical composite film comprising an optically-uniaxial optical film layer with refraction portions and a reflection grating film layer, which allocates light energy from the front viewing angle to a large viewing angle and replaces the polarizing plates, reducing panel thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a VA liquid crystal panel uses conventional optical structures, then production efficiency and manufacturing cost are improved, but color shift and picture quality deteriorate at large viewing angles

Engineering Contradiction:

Improveproduction efficiencyVSAvoidcolor shift at large viewing angle

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a composite optical structure combining optically-uniaxial film layer with refraction portions and a reflection grating film layer. This composite structure integrates different optical mechanisms (refraction and reflection) to achieve both wide viewing angle coverage and color shift correction while maintaining VA panel manufacturing advantages

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs refraction portions with specific geometric parameters (arc-shaped convex surfaces, camber columns, quadrangular prisms) and controls the extraordinary light refractive index of the optically-uniaxial film layer to be greater than the refractive index of the substrate layer. By optimizing these parameters, the system redirects light energy to large viewing angles while correcting color shift

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If thick polarizing plates are used in LCD display panel, then optical performance is improved, but panel thickness increases

Engineering Contradiction:

Improveoptical performanceVSAvoidpanel thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The patent replaces conventional thick polarizing plates with a reflection grating film layer that can be deposited as a thin film structure. This thin film approach maintains the necessary optical performance for polarization and light control while dramatically reducing the thickness contribution from the polarizing plate component

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent substitutes the mechanical thick polarizing plate structure with an optical interference-based reflection grating film layer. This substitution uses optical principles (reflection and interference) rather than relying on the physical thickness of polarizing material to achieve the desired optical performance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 optical composite film improves color shift at large viewing angles and reduces the display panel's thickness while maintaining display resolution and transmission rate.

Implementation Method 1

an optically-uniaxial optical film layer, comprising a plate-shaped portion and a plurality of refraction portions disposed on a side of the plate-shaped portion

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

a reflection grating film layer, disposed on a side of the substrate layer away from the optically-uniaxial optical film layer

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

an optically-uniaxial optical film layer... where an extraordinary light refractive index of the optically-uniaxial optical film layer is greater than a refractive index of the substrate layer

Methodology Applied

Scientific EffectOptical anisotropy: Anisotropy

Data Source

PatentUS11360354B2Optical composite film, display panel and display device

Publication Date: 2022.06.14 HKC CORP LTD

AI summary

An optical composite film includes an optically-uniaxial optical film layer, a substrate layer, and a reflection grating film layer. The optically-uniaxial optical film layer includes a plate-shaped portion and a plurality of refraction portions disposed on a side of the plate-shaped portion, and the plurality of refraction portions is selected from a type of camber columns and quadrangular prisms; the substrate layer is stacked on a side of the plate-shaped portion close to the refraction portion, where the plurality of refraction portions is accommodated in the substrate layer, and an extraordinary light refractive index of the optically-uniaxial optical film layer is greater than a refractive index of the substrate layer; and the reflection grating film layer is disposed on a side of the substrate layer away from the optically-uniaxial optical film layer.