High Refractive Index Layer Pattern Parts for Display Light Diffusion

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Solution Overview

Problem

OLED display devices face degradation in display quality due to reflected external light, which affects visibility and image clarity for users.

Innovation Solution

A display device design featuring a touch sensor layer with a high refractive index layer and a planarization layer, including pattern parts, is implemented to reduce visible reflected light by diffusing external light and improving emission efficiency through a light path changing layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a conventional OLED display structure is used, then the device achieves basic display function, but reflected external light degrades display quality and visibility

Engineering Contradiction:

Improvereflected light visibilityVSAvoiddisplay quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The touch sensor layer is divided into multiple functional layers: a high refractive index layer with pattern parts (protrusions and recesses) and a planarization layer. This segmentation allows each layer to perform specific functions - the patterned high refractive index layer diffuses reflected light, while the planarization layer maintains surface flatness for touch sensitivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The high refractive index layer acts as an intermediary between the OLED display unit and the touch sensor layer. It intercepts and diffuses external reflected light before it reaches the user's eyes, while still allowing touch input to pass through to the underlying layers.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If a flat touch sensor layer is used, then manufacturing is simple, but reflected light remains visible and display quality deteriorates

Engineering Contradiction:

Improvetouch sensor layer fabricationVSAvoidreflected light

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The high refractive index layer features localized pattern parts (protrusions and recesses) in specific regions where reflected light is most problematic. This local modification approach reduces reflected light visibility without requiring complete restructuring of the entire touch sensor layer, balancing manufacturing simplicity with optical performance.

Inventive Principle:

Principle #3Local quality

3Reliability

If the touch sensor layer is added to reduce reflected light, then display quality improves, but device structure becomes more complex

Engineering Contradiction:

Improvedisplay qualityVSAvoidtouch sensor layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The high refractive index layer with pattern parts serves multiple functions simultaneously: it diffuses reflected external light, maintains structural integrity of the touch sensor layer, and provides a platform for the planarization layer. This multi-functionality reduces the need for additional separate components, managing complexity while achieving display quality improvement.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Device complexity

If conventional light emission is used, then device structure is simple, but emission efficiency is insufficient

Engineering Contradiction:

Improvelight path structureVSAvoidemission efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The pattern parts in the high refractive index layer create three-dimensional protrusions and recesses that manipulate light paths in multiple dimensions. This dimensional complexity enables more effective light emission control and improved emission efficiency compared to conventional flat structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution effectively minimizes the visibility of reflected light, enhancing display quality and emission efficiency, thereby improving the overall viewing experience and reducing power consumption.

Implementation Method 1

Methodology Applied

Scientific EffectLight diffusion: Scattering

Implementation Method 2

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS11038151B2Display device

Publication Date: 2021.06.15 SAMSUNG DISPLAY CO LTD

AI summary

A display device including a display unit having a first region, which is flat, and second regions, which are curved, and a touch sensor layer disposed on the display unit. The touch sensor layer includes a high refractive index layer having a first refractive index and a planarization layer disposed on the high refractive index layer and having a second refractive index, which is smaller than the first refractive index, and the high refractive index layer includes pattern parts.