Refractive Index Matching Layer for Display Contrast

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Solution Overview

Problem

The difference in refractive index between the antistatic layer and the substrate in display panels increases reflectivity, leading to lower contrast and impaired performance.

Innovation Solution

Incorporating a refractive index matching layer between the conductive layer and the substrate, with a refractive index smaller than the conductive layer, to reduce reflectivity and enhance display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an antistatic layer is added above the display panel substrate, then static residue is reduced, but reflectivity increases due to refractive index difference

Engineering Contradiction:

Improvestatic residue reductionVSAvoidreflectivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A refractive index matching layer is introduced as an intermediary between the antistatic layer and the substrate. This matching layer has a refractive index that is intermediate between the antistatic layer and the substrate, thereby reducing the abrupt refractive index difference and minimizing reflection at the interface while maintaining the antistatic function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The refractive index of the matching layer is specifically selected and adjusted to match the optical properties between the antistatic layer and substrate. By changing the refractive index parameter of the intermediate layer, the reflection coefficient is reduced according to the Fresnel equations, thereby improving contrast ratio.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the refractive index difference between antistatic layer and substrate is large, then antistatic function is effective, but contrast ratio deteriorates

Engineering Contradiction:

Improveantistatic functionVSAvoidcontrast ratio

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The refractive index matching layer serves as an optical intermediary that gradually transitions the refractive index from the antistatic layer to the substrate, reducing Fresnel reflection and improving contrast ratio while allowing the antistatic layer to maintain its electrostatic function.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 refractive index matching layer effectively decreases reflectivity, thereby improving the contrast and performance of the display panel by adjusting the refractive indices of the materials and their thicknesses.

Implementation Method 1

the difference in the refractive index between the antistatic layer and the substrate of the panel will increase the reflectivity of the display panel

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The first refractive index matching layer is between the conductive layer and the second substrate. The refractive index of the first refractive index matching layer is smaller than the refractive index of the conductive layer.

Methodology Applied

Scientific EffectOptical interference: Interference

Data Source

PatentUS20230040240A1Electronic device

Publication Date: 2023.02.09 INNOLUX CORP

AI summary

An electronic device is provided. The electronic device includes a display panel, a conductive layer, and a first refractive index matching layer. The first refractive index matching layer is between the conductive layer and the second substrate. The refractive index of the first refractive index matching layer is smaller than the refractive index of the conductive layer. The display panel includes a first substrate and a second substrate. The second substrate is above the first substrate.