Optical Film Viewing Angle Improvement for OLED Displays

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Organic light-emitting display devices face degraded viewing angles due to multiple interfaces in encapsulation films, which affect their performance and black characteristics.

Innovation Solution

Incorporating a phase-delay film and a polarizing layer with diffusion modules between the display substrate and optical layer, and an adhesive layer with varying diffusion particle densities to improve light distribution and maintain black characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple interfaces in encapsulation films are used for device structure, then device reliability is improved, but viewing angle is degraded

Engineering Contradiction:

Improvedevice reliabilityVSAvoidviewing angle

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A viewing angle improvement layer is introduced as an intermediary component between the encapsulation film and the display substrate. This layer specifically addresses the viewing angle degradation caused by the multiple interfaces in the encapsulation film structure, allowing the encapsulation film to maintain its reliability function while the viewing angle layer compensates for its negative optical effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The viewing angle improvement layer is positioned specifically in the optical path where viewing angle degradation occurs, rather than modifying the entire encapsulation film structure. This localized approach allows the encapsulation film to maintain its multi-interface structure for reliability while only the specific region affecting viewing angle is optimized.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If diffusion modules are added to improve viewing angle, then viewing angle is improved, but device complexity is increased

Engineering Contradiction:

Improveviewing angleVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The viewing angle improvement layer is integrated with the encapsulation film structure, merging multiple functions into a single layered assembly. This reduces device complexity by combining the encapsulation function with the viewing angle improvement function in one integrated structure rather than adding separate components.

Inventive Principle:

Principle #5Merging (Combining)

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

Enhances the viewing angle of organic light-emitting display devices while maintaining good black characteristics by optimizing light reflection and polarization.

Implementation Method 1

an optical layer disposed on the display substrate and having a phase-delay film and a polarizing layer disposed on the phase-delay film

Methodology Applied

Scientific EffectPhase delay:

Implementation Method 2

several diffusion modules disposed between the display substrate and the optical layer and separated from each other

Methodology Applied

Scientific EffectLight diffusion: Scattering

Data Source

PatentUS9223065B2Optical film and organic light-emitting display device including the same

Publication Date: 2015.12.29 SAMSUNG DISPLAY CO LTD

AI summary

Provided is an organic light-emitting display device. The organic light-emitting display device includes a display substrate having a base substrate and an organic layer disposed on the base substrate, an optical layer disposed on the display substrate and having a phase-delay film and a polarizing layer disposed on the phase-delay film, and several diffusion modules disposed between the display substrate and the optical layer and disposed separately from each other.