Display Device Electrode Segmentation for RC Delay Reduction

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Solution Overview

Problem

Display devices face challenges in maintaining reliability and luminance characteristics due to defects in alignment electrodes and pixel electrodes, leading to potential RC delays and decreased luminance.

Innovation Solution

A display device design where alignment electrodes are electrically separated from connection electrodes, allowing for independent repair and preventing signal interference, with pixel electrodes connected to the connection electrodes through contact holes, ensuring stable electrical contact and minimizing RC delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If alignment electrodes and connection electrodes are electrically connected, then manufacturing process is simplified, but reliability decreases due to inability to independently repair defects

Engineering Contradiction:

ImprovereliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrode system is segmented into alignment electrodes and connection electrodes as separate electrical entities. The alignment electrodes are electrically isolated from connection electrodes through insulating layers, allowing independent repair and maintenance of each electrode type without affecting the other, thereby improving reliability while managing complexity through functional separation

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If pixel electrodes are directly connected to connection electrodes, then electrical connection is simplified, but luminance decreases due to RC delay

Engineering Contradiction:

ImproveluminanceVSAvoidelectrical connection stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

A bridge electrode is introduced as an intermediary element between the pixel electrode and connection electrode. This bridge electrode serves as a mediator that reduces the RC delay by providing an optimized electrical path, thereby improving luminance while maintaining stable electrical connection through the intermediate structure

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of repair

If alignment electrodes are electrically separated from connection electrodes, then reliability improves through independent repair, but manufacturing complexity increases

Engineering Contradiction:

Improveease of repairVSAvoidease of manufacture

Core Design Contradiction:

Ease of repairVSEase of manufacture

Solution Approach 1:

The electrical system is segmented into separate alignment and connection electrode networks, with insulating layers providing electrical isolation. This segmentation enables independent repair of alignment electrodes without affecting connection electrodes, improving ease of repair while the modular structure helps manage manufacturing complexity through clear functional boundaries

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4068356A1Display device

Publication Date: 2022.10.05 SAMSUNG DISPLAY CO LTD

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AI summary

A display device includes a transistor disposed in a pixel, a connection electrode electrically connected to the transistor, first electrodes electrically separated from the connection electrode, light emitting elements disposed between the first electrodes, and second electrodes disposed on the first electrodes and the light emitting elements. The second electrodes electrically connect the connection electrode and the light emitting elements.