Display Device Pixel Segmentation Crosstalk Reduction

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Solution Overview

Problem

Existing display devices face challenges in achieving reliable and efficient operation with improved optical and electrical properties, particularly in reducing optical and electrical crosstalk between pixels, which affects their performance and efficiency.

Innovation Solution

The display device incorporates a semiconductor layer sequence with a first and second semiconductor layer of different conductivity types, separated by an active layer, and features a contact structure with recesses and separating regions to reduce crosstalk, allowing for separate operation of pixels and improved radiation generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If pixels are arranged closely to increase radiating area, then area efficiency is improved, but optical and electrical crosstalk between pixels increases

Engineering Contradiction:

Improveradiating areaVSAvoidoptical and electrical crosstalk

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The display device is divided into separately operable pixels with distinct contact structures for each pixel. Each pixel has its own first contact structure contacting the first semiconductor layer and second contact structure contacting the second semiconductor layer, enabling independent control and reducing electrical crosstalk between adjacent pixels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Insulating layers are introduced as intermediary elements between adjacent pixels. These insulating layers are arranged between the first contact structures of adjacent pixels and between the second contact structures of adjacent pixels, effectively blocking electrical crosstalk while allowing the pixels to be closely spaced for high area efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If contact structures are added to control pixels separately, then pixel operability is improved, but device complexity increases

Engineering Contradiction:

Improvepixel controlVSAvoidcontact structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The first contact structures of multiple adjacent pixels are merged into a common first contact structure that contacts the first semiconductor layer. Similarly, the second contact structures are merged into a common second contact structure contacting the second semiconductor layer. This merging approach simplifies the overall device structure while still enabling separate pixel control through the insulating layer segmentation.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If insulating layers are added between pixels, then electrical crosstalk is reduced, but manufacturing complexity increases

Engineering Contradiction:

Improveelectrical isolationVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The insulating layers serve multiple functions simultaneously: they provide electrical isolation between adjacent pixels, define pixel boundaries, and support the contact structures. This multi-functionality reduces the need for additional separate components and simplifies the overall manufacturing process despite the added isolation capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances the display device's efficiency by reducing optical and electrical crosstalk, increasing brightness, and ensuring reliable operation with redundant contacting, resulting in improved performance and high radiating area efficiency.

Implementation Method 1

a semiconductor layer sequence for generating electromagnetic radiation... The active layer is arranged between the first semiconductor layer and the second semiconductor layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11121124B2Display device with a plurality of separately operable pixels formed in a grid

Publication Date: 2021.09.14 OSRAM OLED

AI summary

A display device is disclosed. In an embodiment a display device having a plurality of pixels separately operable from each other includes a semiconductor layer sequence including a first semiconductor layer, an active layer and a second semiconductor layer, a first contact structure contacting the first semiconductor layer and a second contact structure contacting the second semiconductor layer and at least one separating region extending through the first contact structure, the first semiconductor layer and the active layer into the second semiconductor layer, wherein the semiconductor layer sequence and the first contact structure have at least one first recess laterally adjacent with respect to a respective pixel, the first recess extending through the first contact structure, the first semiconductor layer and the active layer into the second semiconductor layer, and wherein the second contact structure includes second contacts extending through the at least one first recess.