Light-Blocking Element Over Redundant Pad for Micro-LED Contrast

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Solution Overview

Problem

Electronic devices with micro-LEDs face reduced ambient contrast ratio due to redundant pads that reflect ambient light before repair, as they are not initially equipped with micro-LEDs.

Innovation Solution

Incorporating a first substrate with sub-pixels featuring main and redundant pads, where light-emitting elements are initially placed on main pads, inspected, and then transferred to redundant pads if defective, and light-blocking elements are strategically positioned over redundant pads without micro-LEDs to reduce reflected light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If redundant pads are provided without micro-LEDs for future repair, then repair capability is improved, but ambient contrast ratio deteriorates due to light reflection

Engineering Contradiction:

Improverepair capabilityVSAvoidambient contrast ratio

Core Design Contradiction:

Ease of repairVSIllumination intensity

Solution Approach 1:

A light-blocking element is introduced as an intermediary component between the redundant pad and the ambient light. This element selectively blocks light reflection from the redundant pad while allowing the pad to remain accessible for future repair operations. The light-blocking element acts as a mediator that resolves the conflict between maintaining repair capability and improving display quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If light-blocking elements are added over redundant pads, then ambient contrast ratio is improved, but device complexity increases

Engineering Contradiction:

Improveambient contrast ratioVSAvoidstructure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The light-blocking element is merged with existing structural components of the display device, such as integrating it into the pixel structure or combining it with the encapsulation layer. This merging approach allows the light-blocking function to be added without creating entirely separate components, thereby reducing the increase in device complexity while still achieving the desired improvement in ambient contrast ratio.

Inventive Principle:

Principle #5Merging (Combining)

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 enhances the ambient contrast ratio of electronic devices by minimizing light reflection from redundant pads without micro-LEDs, ensuring high display quality even during the repair process.

Implementation Method 1

the first light-blocking elements are disposed, such that the first light-blocking elements overlap another part of the first redundant pads in a vertical direction of the first substrate

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Data Source

PatentUS20230140197A1Electronic device and manufacturing method of electronic device

Publication Date: 2023.05.04 INNOLUX CORP

AI summary

Provided is an electronic device including a first substrate and a first light-blocking element. The first substrate includes a plurality of subpixels. Each subpixel includes a first main pad, a first redundant pad, and a first light-emitting element. The first light-emitting element is disposed on the first main pad. The first light-blocking element overlaps the first redundant pad in a vertical direction of the first substrate. A manufacturing method of the electronic device is also provided.