Organic Light-Emitting Display Reflection Prevention

Solution Overview

Problem

Existing organic light-emitting display devices face challenges in maximizing external light transmittance and minimizing reflection, which affects image clarity and contrast due to the presence of reflective electrodes and optical films.

Innovation Solution

The design incorporates a reflection preventing film with a reflection preventer, such as a circular or linear polarization film, and a transparent unit, which reduces reflectivity in the light-emitting region and enhances transmittance in the external light penetration region by strategically positioning these films and electrodes to prevent external light reflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If reflective electrodes and optical films are used in the display device, then light emission efficiency is improved, but external light transmittance decreases and reflection increases

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidexternal light reflection

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The display device is divided into two distinct regions: a first region with reflective electrodes and optical films for light emission, and a second region without these components for external light transmittance. This segmentation allows each region to independently fulfill its specific function without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display device are assigned different optical properties: the first region has high reflectivity and light emission capability, while the second region has high transmittance. This local differentiation of properties resolves the contradiction between light emission efficiency and external light transmittance.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If reflective electrodes are present in the display device, then light emission is enhanced, but image clarity deteriorates due to reflection

Engineering Contradiction:

Improvelight emissionVSAvoidimage clarity

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The display device is divided into two distinct regions: a first region with reflective electrodes and optical films for light emission, and a second region without these components for external light transmittance. This segmentation allows each region to independently fulfill its specific function without interference.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If the entire display area is made transparent for external light penetration, then external light transmittance is maximized, but light emission capability is lost

Engineering Contradiction:

Improveexternal light transmittanceVSAvoidlight emission

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The display device is divided into two distinct regions: a first region with reflective electrodes and optical films for light emission, and a second region without these components for external light transmittance. This segmentation allows each region to independently fulfill its specific function without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display device are assigned different optical properties: the first region has high reflectivity and light emission capability, while the second region has high transmittance. This local differentiation of properties resolves the contradiction between light emission efficiency and external light transmittance.

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

This approach increases external light transmittance, improves image clarity, and maintains high contrast by effectively reducing external light reflection, allowing for better viewing of images and external scenes without distortion.

Implementation Method 1

The reflection preventer may include a linear polarization film and a phase converting film

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

The reflection preventer may include a linear polarization film and a phase converting film

Methodology Applied

Scientific EffectPhase conversion:

Implementation Method 3

The reflection preventer may include a circular polarization film

Methodology Applied

Scientific EffectCircular polarization: Polarisation

Implementation Method 4

The second electrode may be a light reflecting electrode

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS8963815B2Organic light-emitting display device

Publication Date: 2015.02.24 SAMSUNG DISPLAY CO LTD

AI summary

An organic light-emitting display device including: pixels on a first surface of a substrate, each pixel having a first region and a second region; pixel circuit units in the first region, each pixel circuit unit including at least one TFT; a first insulation film covering the pixel circuit units; first electrodes on the first insulation film, each first electrode being independently disposed in the first region and electrically connected to each pixel circuit unit; a second insulation film covering at least part of the first electrodes; a second electrode facing the first electrodes, the second electrode being electrically connected throughout the pixels and formed in at least the first region; an organic film between the first electrodes and the second electrode; a sealing member facing the first surface of the substrate; and a reflection preventing film on a second surface of the substrate.