LCD Color Mixture Prevention via Layer Distance Control

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Solution Overview

Problem

Conventional liquid crystal display (LCD) devices face limitations in color expression due to the distance and alignment issues between the liquid crystal layer and the color conversion layer, leading to potential color mixture and parallax effects.

Innovation Solution

A display device configuration with a polarizing plate including a polymer film, a distance between the liquid crystal layer and the color conversion layer ranging from 5 μm to 50 μm, and the absence of an alignment layer on the second electrode to prevent deformation of the polarizing plate, ensuring a short distance and reducing the occurrence of color mixture and parallax.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the distance between the liquid crystal layer and the color conversion layer is increased, then the alignment layer can be properly formed, but color mixture and parallax effects occur

Engineering Contradiction:

Improvealignment layer formationVSAvoidcolor mixture and parallax

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by precisely controlling the distance between the liquid crystal layer and the color conversion layer to be within 5 μm to 50 μm. This specific parameter range allows the alignment layer to be properly formed while minimizing color mixture and parallax effects. The patent further specifies that the polarizing plate thickness should be 3 μm to 10 μm to achieve optimal performance.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If an alignment layer is added to improve alignment, then alignment precision improves, but the distance between layers increases causing color mixture

Engineering Contradiction:

Improvealignment precisionVSAvoidcolor mixture

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent merges the alignment layer with the color conversion layer by forming the alignment layer on the surface of the color conversion layer that faces the liquid crystal layer. This integration allows the alignment function to be achieved without adding significant distance between layers, thereby preventing color mixture while maintaining alignment precision.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses the color conversion layer as an intermediary structure that simultaneously serves optical conversion and alignment functions. By forming the alignment layer on the color conversion layer surface, the patent eliminates the need for a separate alignment layer positioned far from the color conversion layer, thus reducing the distance that would cause color mixture.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If the polarizing plate is deformed due to alignment layer formation, then alignment is achieved, but display quality deteriorates

Engineering Contradiction:

Improvealignment achievementVSAvoidpolarizing plate deformation

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent introduces a protective layer as an intermediary between the alignment layer and the polarizing plate. This protective layer prevents direct contact and deformation of the polarizing plate during alignment layer formation, while still allowing the alignment function to be achieved. The protective layer acts as a buffer that maintains polarizing plate integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies beforehand cushioning by forming the protective layer before forming the alignment layer. This protective layer is positioned between the alignment layer and the polarizing plate to cushion against any potential deformation during the alignment layer formation process, thereby preventing polarizing plate deformation while maintaining alignment functionality.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 configuration enhances color expression capability by minimizing the impact of light from one pixel on adjacent pixels, thereby preventing parallax and improving display quality.

Implementation Method 1

a color conversion layer disposed on the polarizing plate and including a plurality of color conversion portions

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

a polarizing plate disposed on the liquid crystal layer

Methodology Applied

Scientific EffectPolarisation: Polarisation

Implementation Method 3

liquid crystal molecules of the liquid crystal layer are rearranged such that an amount of transmitted light is controlled

Methodology Applied

Scientific EffectLiquid crystal orientation: Liquid Crystals

Data Source

PatentUS10359672B2Display device and manufacturing method thereof

Publication Date: 2019.07.23 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a first substrate; a first electrode disposed on the first substrate; a liquid crystal layer disposed on the first electrode; a polarizing plate disposed on the liquid crystal layer; a color conversion layer disposed on the polarizing plate and including a plurality of color conversion portions; and a second substrate disposed on the color conversion layer. The polarizing plate includes a polymer film, and a distance between the liquid crystal layer and the color conversion layer is in a range of about 5 μm to about 50 μm.