OLED Display Panel Stacked Subunits for Brightness

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic light emitting diode (OLED) display panels and devices have low light emitting intensity and overall display brightness due to the limitations of current light emitting units.

Innovation Solution

The implementation of a display panel structure comprising multiple light emitting units, each consisting of a first, second, and third light emitting subunit with specific electrode and light emitting layer configurations, including charge generation layers and carrier function layers, to enhance light emitting intensity and brightness. This structure includes a stacked light emitting structure with multiple light emitting layers of different wavelengths and colors, and charge generation layers positioned between adjacent light emitting layers to improve recombination efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional OLED light emitting unit structure is used, then the device achieves self-luminous characteristics and thin profile, but the light emitting intensity and display brightness are insufficient

Engineering Contradiction:

Improvelight emitting intensityVSAvoidlight emitting unit structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The light emitting unit is divided into multiple light emitting subunits (first, second, and third subunits), each containing separate light emitting layers. This segmentation allows each subunit to contribute to the overall light output, thereby increasing total light emitting intensity while maintaining a manageable structural organization through modular subunit design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple light emitting layers are nested within the light emitting unit structure, with first light emitting layers, second light emitting layers, and charge generation layers arranged in a nested configuration between electrodes. This nested arrangement maximizes light generation within the constrained thickness, improving brightness without proportionally increasing external dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Illumination intensity

If multiple light emitting layers are added to increase brightness, then light emitting intensity improves, but structural complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvedisplay brightnessVSAvoidmanufacturing process

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

Multiple light emitting layers and charge generation layers are merged into an integrated stacked structure within the light emitting unit. This combining approach allows simultaneous fabrication of multiple functional layers in a coordinated manner, reducing the complexity that would arise from assembling separate components, thereby improving manufacturability while achieving enhanced brightness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes the vertical dimension by stacking multiple light emitting layers and charge generation layers between the first and second electrodes. This vertical arrangement allows multiple light-generating elements to be packed within the thickness direction, increasing brightness without expanding the planar area, thus simplifying manufacturing compared to lateral expansion approaches.

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 enhanced light emitting intensity of individual subunits leads to improved overall display brightness and light emitting unit performance, achieving higher brightness in OLED display panels and devices.

Implementation Method 1

a charge generation layer, the charge generation layer is positioned between the first light emitting layer and the second light emitting layer adjacent to each other

Methodology Applied

Scientific EffectCharge generation:

Implementation Method 2

each of the light emitting units includes a first electrode positioned close to the substrate, a second electrode positioned opposite to the first electrode, and a second light emitting layer positioned between the first electrode and the second electrode

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

in the first light emitting subunit, a light emitting wavelength of the first light emitting layer is less than a light emitting wavelength of the second light emitting layer; in the second light emitting subunit, a light emitting wavelength of the first light emitting layer is less than a light emitting wavelength of the second light emitting layer

Methodology Applied

Scientific EffectLight emission: Light Emitting Diode

Data Source

PatentUS11228022B2Display panel and display device

Publication Date: 2022.01.18 SUZHOU GOVISIONOX INNOVATION TECHNOLOGY CO LTD

AI summary

Provided are a display panel and a display device. The display panel includes a substrate; multiple light emitting units which is disposed on one side of the substrate and arranged in an array, and each of the multiple light emitting unit includes a first light emitting subunit, a second light emitting subunit and a third light emitting subunit, where the light emitting unit includes a first electrode disposed close to the substrate, a second electrode disposed opposite to the first electrode, and a second light emitting layer disposed between the first electrode and the second electrode, at least the third light emitting subunit includes at least one first light emitting layer disposed between the second light emitting layer and the first electrode.