Backlight LED Module String Layout for Lower Driving Voltage

Solution Overview

Problem

Light emitting diodes connected in series in backlight modules often require excessively high driving voltages, which can lead to damage when operated at commercial voltages, and existing classification methods result in mismatched modules that cannot be assembled into a set.

Innovation Solution

The light emitting module is designed with a bar-shaped circuit board and reflection walls surrounding strings of light emitting devices, where each string is connected in series, and the modules are classified using a method that assigns them into main and auxiliary classes based on forward voltage differences to ensure compatibility and reduce driving voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a large number of light emitting devices are connected in series to increase brightness, then illumination intensity is improved, but driving voltage becomes excessively high and reliability deteriorates

Engineering Contradiction:

ImprovebrightnessVSAvoiddamage risk

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The light emitting devices are divided into multiple strings (first string, second string, third string, etc.), where each string contains a series connection of light emitting devices. These multiple strings are then connected in parallel to each other. This segmentation allows the total number of light emitting devices to be distributed across several series paths, reducing the voltage requirement for each individual string while maintaining overall brightness through parallel combination.

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If a large number of light emitting devices are connected in series to increase brightness, then illumination intensity is improved, but device complexity increases due to voltage management

Engineering Contradiction:

ImprovebrightnessVSAvoidvoltage management

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The light emitting devices are divided into multiple strings (first string, second string, third string, etc.), where each string contains a series connection of light emitting devices. These multiple strings are then connected in parallel to each other. This segmentation allows the total number of light emitting devices to be distributed across several series paths, reducing the voltage requirement for each individual string while maintaining overall brightness through parallel combination.

Inventive Principle:

Principle #1Segmentation

3Illumination intensity

If high driving voltage is applied to increase brightness, then illumination intensity is improved, but the light emitting module becomes easily damaged

Engineering Contradiction:

ImprovebrightnessVSAvoiddamage susceptibility

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The light emitting devices are divided into multiple strings (first string, second string, third string, etc.), where each string contains a series connection of light emitting devices. These multiple strings are then connected in parallel to each other. This segmentation allows the total number of light emitting devices to be distributed across several series paths, reducing the voltage requirement for each individual string while maintaining overall brightness through parallel combination.

Inventive Principle:

Principle #1Segmentation

4Device complexity

If light emitting devices are arranged in a single series connection to simplify structure, then device complexity is reduced, but illumination intensity becomes insufficient

Engineering Contradiction:

Improveconnection structureVSAvoidbrightness

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The light emitting devices are divided into multiple strings (first string, second string, third string, etc.), where each string contains a series connection of light emitting devices. These multiple strings are then connected in parallel to each other. This segmentation allows the total number of light emitting devices to be distributed across several series paths, reducing the voltage requirement for each individual string while maintaining overall brightness through parallel combination.

Inventive Principle:

Principle #1Segmentation

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 design lowers the driving voltage requirements and ensures uniform light distribution while allowing for efficient assembly of compatible modules into a display apparatus, reducing the risk of damage and improving module compatibility.

Implementation Method 1

a reflection wall surrounding the light emitting devices

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12616068B2Light emitting module and display apparatus

Publication Date: 2026.04.28 SEOUL SEMICON SHENZHEN CO LTD

AI summary

The present disclosure provides a light emitting module and a display apparatus. Alight emitting module according to an embodiment includes a bar-shaped circuit board; a plurality of light emitting devices disposed on the circuit board; and a reflection wall surrounding the light emitting devices, in which the plurality of light emitting devices is divided into at least two strings, and each of the strings includes light emitting devices connected in series.