Coherence Prevention Layer for Display Visibility

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Solution Overview

Problem

Existing display apparatuses suffer from spectral dispersion patterns due to destructive or constructive interference of reflected light, which reduces contrast and visibility, especially when exposed to external light. Conventional solutions, such as polarizers, are expensive and thick.

Innovation Solution

A display apparatus is designed with a coherence prevention layer that includes a refractive index particle layer and a filling layer. The refractive index particle layer consists of a light-transmissive matrix with refractive index particles dispersed within, and the filling layer has a different refractive index. This configuration alters the propagation speed of external and reflected light, thereby weakening their coherence and suppressing diffraction interference patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizer is attached to prevent external light reflection, then visibility and contrast are improved, but the device becomes expensive and thick

Engineering Contradiction:

Improvevisibility deterioration due to external light reflectionVSAvoidthickness and cost of polarizer film

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent changes the refractive index parameter of the coating layer to control light reflection. By adjusting the refractive index to be between 1.3 and 1.7, the coating layer reduces external light reflection without requiring thick polarizer films, thus improving visibility while maintaining a thin and cost-effective structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite coating layer made of resin material combined with transparent particles having different refractive indices. This composite structure achieves effective light reflection control with a thin layer, replacing the need for thick polarizer films while reducing cost and maintaining visibility

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If regular apertures are arranged in the display panel, then manufacturing is simplified, but diffraction interference patterns occur reducing image quality

Engineering Contradiction:

Improveregular arrangement of aperturesVSAvoiddiffraction interference patterns

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating an irregular aperture arrangement where aperture size and position vary locally across the display panel. This local variation disrupts the regularity that causes diffraction interference patterns, improving image quality while maintaining manufacturing feasibility through localized control

Inventive Principle:

Principle #3Local quality

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 coherence prevention layer effectively suppresses the occurrence of diffraction interference patterns, improving black visibility and reducing rainbow mura and circular ring mura, thereby achieving better image quality without the need for a polarizer.

Implementation Method 1

The optical member according to an embodiment of the present disclosure includes materials with different refractive indices, and these materials can change the propagation speed of external light and reflected light, thereby weakening the coherence of reflected light

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

capable of minimizing the occurrence of spectral dispersion patterns caused by destructive interference or constructive interference of reflected light during external light is reflected

Methodology Applied

Scientific EffectInterference: Interference

Implementation Method 3

apertures can be regularly arranged between these regularly arranged components. These regularly arranged apertures can serve as slits that generate diffraction of light

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentUS20250044488A1Display apparatus with improved reflective visibility

Publication Date: 2025.02.06 LG DISPLAY CO LTD

AI summary

A display apparatus and a coherence prevention member are discussed. The display apparatus in one example includes a display panel configured to display an image, and a coherence prevention layer on the display panel. The coherence prevention layer includes a refractive index particle layer and a filling layer on the refractive index particle layer. The refractive index particle layer includes a light-transmissive matrix and refractive index particles dispersed in the light-transmissive matrix. Further, the filling layer and the refractive index particles have different refractive indices.