LED Display Light-Absorbing Layer for Optical Interference Control

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Solution Overview

Problem

Conventional LED display apparatuses face issues with optical interference and damage due to large viewing angles and inadequate protection of light emitting devices, leading to reduced image clarity and potential device failure.

Innovation Solution

A display apparatus design featuring a circuit board with light emitting devices mounted on it, covered by a transparent substrate and a light absorbing layer, including PDMA or black EMC, which reduces optical interference and protects the devices from damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If light emitting devices are arranged closely to reduce mounting area, then productivity increases, but optical interference between adjacent devices occurs reducing image clarity

Engineering Contradiction:

Improvemounting area efficiencyVSAvoidimage clarity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A light absorbing layer is introduced as an intermediary substance between adjacent light emitting devices. This layer selectively absorbs stray light and optical interference patterns while allowing the desired light emission to pass through, thereby maintaining image clarity despite close device spacing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light absorbing layer is applied selectively in regions where optical interference occurs, rather than uniformly across the entire display. This localized approach maintains productivity by allowing close device spacing while preserving image clarity in critical areas

Inventive Principle:

Principle #3Local quality

2Reliability

If black material is used to form sidewalls for protecting light emitting devices, then device protection improves, but excessive light is absorbed reducing display brightness

Engineering Contradiction:

Improvedevice protectionVSAvoiddisplay brightness

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The optical properties of the protective layer are changed by using materials with specific absorption characteristics that differ from traditional black materials. The light absorbing layer has parameters optimized to protect devices while maintaining light transmission for display brightness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of using black sidewall material that directly contacts and absorbs light from devices, a light absorbing layer is introduced as an intermediary that provides protection through controlled light absorption rather than complete blockage

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If light emitting devices are exposed to the outside for easy access, then ease of operation improves, but devices are easily damaged reducing reliability

Engineering Contradiction:

Improvedevice accessibilityVSAvoiddevice durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A transparent substrate in the form of a protective film or shell is used to cover the light emitting devices. This thin film provides mechanical protection against damage while maintaining transparency to allow the devices to function and be accessed when necessary

Inventive Principle:

Principle #30Flexible shells and thin films

4Ease of manufacture

If adhesive material is used to bond light emitting devices to circuit board, then device mounting improves, but adhesion failure occurs under thermal stress reducing reliability

Engineering Contradiction:

Improvedevice mountingVSAvoidbonding durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The bonding system uses composite material structures including adhesive layers with specific thermal and mechanical properties. The light absorbing layer itself may serve as an additional bonding interface, creating a composite structure that distributes thermal stress and prevents adhesion failure

Inventive Principle:

Principle #40Composite materials

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 solution enhances image clarity by minimizing optical interference and improves the durability of the light emitting devices by preventing excessive light absorption and peeling issues, thereby maintaining the integrity of the display.

Implementation Method 1

a light absorbing layer disposed between the transparent substrate and the light emitting devices, in which the light absorbing layer covers upper regions of the light emitting devices and a region between the light emitting devices

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20230378406A1Light emitting device and LED display apparatus having the same

Publication Date: 2023.11.23 SEOUL VIOSYS CO LTD

AI summary

A display apparatus including a circuit board, a plurality of light emitting devices mounted on the circuit board, a transparent substrate disposed on the light emitting devices, and a light absorbing layer disposed between the transparent substrate and the light emitting devices, in which the light absorbing layer covers upper regions of the light emitting devices and a region between the light emitting devices.