Light-Absorbing Layer Layout for LED Color Uniformity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Light emitting elements with varying inclination angles cause issues such as color mura and white color shift due to differing light intensities from lateral surfaces.

Innovation Solution

Incorporating a light absorbing layer between adjacent light emitting elements on a substrate to absorb light emitted from their lateral surfaces, reducing intensity variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If light emitting elements are disposed with different inclination angles to achieve diverse light emission directions, then light emission coverage is improved, but color uniformity deteriorates due to varying lateral surface light intensity

Engineering Contradiction:

Improvelight emission coverageVSAvoidcolor uniformity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

A light absorbing layer is introduced as an intermediary component between adjacent light emitting elements. This layer selectively absorbs excess light from lateral surfaces while allowing top surface light to pass through, thereby mediating the light emission to achieve uniform color appearance without altering the original inclination angle configurations

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light absorbing layer is selectively positioned only in regions where lateral surface light emission causes color non-uniformity. The layer's optical properties are specifically tailored to absorb light from lateral surfaces while maintaining transparency to light emitted from top surfaces, creating localized optical correction

Inventive Principle:

Principle #3Local quality

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 light absorbing layer mitigates color mura and white color shift by equalizing light intensity across different viewing angles.

Implementation Method 1

a light absorbing layer is disposed on the substrate and is located between two adjacent light emitting elements, and the light absorbing layer contacts the at least one lateral surface

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12469827B2Electronic device with light absorbing layer between light emitting elements and manufacturing method thereof

Publication Date: 2025.11.11 INNOLUX CORP

AI summary

An electronic device and a manufacturing method thereof are provided. The electronic device includes a substrate, multiple light emitting elements, and a light absorbing layer. The light emitting elements are disposed on the substrate. One of the light emitting elements has at least one lateral surface. The light absorbing layer is disposed on the substrate and is located between two adjacent light emitting elements, and the light absorbing layer contacts the at least one lateral surface.