Pixel-Matched Retardation Circular Polarizing Plate for OLED Light Leakage

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Solution Overview

Problem

Conventional circular polarizing plates for organic light emitting devices have strong wavelength dependency, leading to light leakage and deteriorated display quality, and the use of compensation films to address this issue increases the device's thickness.

Innovation Solution

An organic light emitting device with a circular polarizing plate having multiple retardation regions corresponding to different pixels, where the retardations satisfy specific relationships, and a compensation film with regions tailored to each pixel type, including blue, green, and red pixels, to minimize light leakage without increasing the device's thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a conventional circular polarizing plate is used, then the device structure is simple, but light leakage occurs due to strong wavelength dependency

Engineering Contradiction:

Improvecircular polarizing plate structureVSAvoidlight leakage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by dividing the compensation film into multiple regions corresponding to different pixels (red, green, blue), where each region has a specifically optimized retardation value tailored to its pixel type. This localized optimization eliminates wavelength dependency and light leakage while maintaining overall device simplicity.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If a compensation film is laminated to the conventional circular polarizing plate, then light leakage is compensated, but the device thickness increases

Engineering Contradiction:

Improvelight leakage compensationVSAvoiddevice thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent merges the compensation film and polarizer into a single integrated circular polarizing plate structure. The compensation film is positioned between the polarizer and the display panel, combining polarization and compensation functions in one component, thereby eliminating light leakage without increasing device thickness.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If the circular polarizing plate has multiple retardation regions corresponding to different pixels, then display characteristics are improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvedisplay characteristicsVSAvoidcircular polarizing plate fabrication

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent implements local quality by creating distinct retardation regions (Re1 for red pixels, Re2 for green pixels, Re3 for blue pixels) within the compensation film, with each region optimized for its corresponding pixel type. This approach improves display characteristics while using standard manufacturing techniques for forming different regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies parameter changes by optimizing specific retardation values (Re1, Re2, Re3) for different pixel types to minimize light leakage. By adjusting these retardation parameters according to the microcavity effects of each pixel, the patent achieves superior display characteristics without requiring fundamentally new manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

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 reduces light leakage and reflection color shift across pixels, enhancing display characteristics while maintaining the device's thinness by optimizing the retardation values of the compensation film and polarizer.

Implementation Method 1

a circular polarizing plate may be attached to a surface of a display panel, and thus leakage of the reflected external light to the outside may be reduced

Methodology Applied

Scientific EffectPolarisation: Polarisation

Implementation Method 2

the circular polarizing plate has a plurality of retardations corresponding to the pixels of the display panel

Methodology Applied

Scientific EffectBirefringence: Birefringence

Implementation Method 3

a microcavity effect may occur in the pixels of the display panel

Methodology Applied

Scientific EffectMicrocavity effect: Resonance

Data Source

PatentUS10317595B2Organic light emitting device including circular polarizing plate having retardations corresponding to pixels

Publication Date: 2019.06.11 SAMSUNG ELECTRONICS CO LTD

AI summary

An organic light emitting device includes a display panel including a plurality of pixels and a circular polarizing plate disposed opposite to the display panel, where the circular polarizing plate has a plurality of retardations corresponding to the pixels of the display panel. A method of manufacturing an organic light emitting device includes preparing a display panel including a plurality of pixels, preparing a circular polarizing plate having a plurality of retardations, and assembling the display panel and the circular polarizing plate, where the display panel and the circular polarizing plate are assembled so that the retardations of the circular polarizing plate respectively correspond to the pixels of the display panel.