Same-Side Electrode OLED for Slim Touch Display

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Solution Overview

Problem

Current touch display panels face challenges in achieving efficient light emission and panel slimness due to the overlap of touch sensing and display regions, which affects light emission efficiency and panel thickness.

Innovation Solution

The design includes a touch display panel with non-overlapping touch sensing and display regions, featuring a light-emitting device with electrodes on the same side of the organic light-emitting layer and a connecting bridge to enhance light emission efficiency, and a dielectric structure to isolate touch sensors from light-emitting devices, allowing for a slimmer panel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If touch sensing and display regions are overlapped in conventional touch display panels, then both touch function and display function can be integrated, but light emission efficiency deteriorates and panel thickness increases

Engineering Contradiction:

Improvetouch function and display function integrationVSAvoidlight emission efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent divides the display panel into distinct touch sensing regions and display regions that do not overlap. The touch sensors are positioned in first regions while the light-emitting devices are positioned in second regions, spatially segmenting the functions to eliminate light emission efficiency degradation while maintaining both touch and display capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent arranges touch sensors and light-emitting devices in different spatial regions within the same panel plane. By utilizing lateral spatial separation rather than vertical stacking, the invention maintains panel slimness while preventing light emission efficiency loss that would occur with overlapping structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If touch sensors and light-emitting devices are positioned in overlapping regions, then device integration is achieved, but panel thickness increases

Engineering Contradiction:

Improvedevice integrationVSAvoidpanel thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent segments the panel into distinct first regions for touch sensors and second regions for light-emitting devices. This spatial segmentation allows both functions to be integrated in the same panel without requiring overlapping vertical structures, thereby maintaining slim panel thickness while achieving functional integration.

Inventive Principle:

Principle #1Segmentation

3Reliability

If electrodes are positioned on opposite sides of the organic light-emitting layer, then electrical isolation is achieved, but light emission efficiency deteriorates

Engineering Contradiction:

Improveelectrical isolationVSAvoidlight emission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent inverts the conventional electrode arrangement by positioning both the first electrode and second electrode on the same side of the organic light-emitting layer. This inverted configuration, combined with the connecting bridge structure, achieves electrical isolation while allowing light to emit efficiently from the organic light-emitting layer without being blocked by opposing electrodes.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a connecting bridge as an intermediary structure that connects the first electrode and second electrode on the same side of the organic light-emitting layer. This connecting bridge provides the necessary electrical isolation while maintaining circuit connectivity, enabling efficient light emission without the need for electrodes positioned on opposite sides.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration improves light emission efficiency and enables a slimmer touch display panel by preventing electrode overlap, enhancing both light output and panel thickness reduction.

Implementation Method 1

When a voltage is applied to the first electrode and the second electrode, holes and electrons are injected from the first electrode and the second electrode into the organic light-emitting layer, respectively, and recombine in the organic light-emitting layer to emit light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10651413B2Light-emitting device and display panel including the same

Publication Date: 2020.05.12 INT TECH CO LTD

AI summary

A light-emitting device includes an organic light-emitting layer, a first electrode disposed at one side of the organic light-emitting layer, and a second electrode disposed at the same side of the organic light-emitting layer as the first electrode. The first electrode is spaced apart from the second electrode. A display panel includes a substrate including a display region and a touch sensing region defined along a substrate-horizontal direction, at least one light-emitting device disposed over the substrate in the display region, and at least one touch sensor disposed over the substrate in the touch sensing region. The display region and the touch sensing region are not overlapped.