Light Source Module With Alternating Light-Absorbing Portions

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Solution Overview

Problem

Conventional backlight modules experience bright bands and luminance non-uniformity due to the direct abutment of light-emitting diodes with light guide plates, leading to decreased overall luminance when attempting to address these issues.

Innovation Solution

A light source module with a flexible printed circuit board, light-emitting diodes, and alternating light-absorbing portions that absorb and reflect light, preventing direct contact with the light guide plate and minimizing bright bands while maintaining luminance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the light-incident surface of the light guide plate abuts the light-emitting surfaces of the light emitting diodes, then light use efficiency is increased, but bright bands and luminance non-uniformity are generated

Engineering Contradiction:

Improvelight use efficiencyVSAvoidbright bands and luminance non-uniformity

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The circuit board is divided into different regions with different optical properties: a first region with a light-absorbing coating near the light emitting diodes to prevent bright bands, and a second region with a light-reflecting coating to enhance light utilization. This local differentiation resolves the contradiction by allowing light absorption where needed to prevent luminance non-uniformity while maintaining light reflection in other areas to improve overall light use efficiency.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the entire surface of the circuit board is blackened to absorb light, then bright bands are prevented, but overall luminance is decreased

Engineering Contradiction:

Improvebright bandsVSAvoidoverall luminance

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

Instead of uniformly blackening the entire circuit board surface, the invention applies a light-absorbing coating only to a first region near the light emitting diodes where bright bands occur, while applying a light-reflecting coating to a second region. This localized approach prevents bright bands without sacrificing overall luminance, as the light-reflecting region compensates for the light absorbed in the first region.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The circuit board surface is segmented into distinct functional regions: a first region with light-absorbing properties to eliminate bright bands and a second region with light-reflecting properties to maintain luminance. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between preventing bright bands and maintaining overall luminance.

Inventive Principle:

Principle #1Segmentation

3Stability of the object's composition

If light-absorbing portions are added to prevent bright bands, then luminance uniformity is improved, but device complexity increases

Engineering Contradiction:

Improveluminance uniformityVSAvoidstructure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The invention merges the light-absorbing function and light-reflecting function into a single circuit board structure by applying different coatings to different regions of the same board. This integration avoids adding separate components or structures, thus improving luminance uniformity without significantly increasing device complexity.

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

The solution effectively prevents bright bands near the light guide plate, enhancing the luminance of the backlight module by strategically placing light-absorbing and reflective portions on the circuit board.

Implementation Method 1

light-absorbing portions are used to absorb portions of light emitted from light-emitting diodes

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a blank portion is used to reflect the light

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS10121938B2Light source module

Publication Date: 2018.11.06 RADIANT OPTO ELECTRONICS CORP

AI summary

A light source module is provided. The light source module includes a flexible printed circuit board, plural light-emitting diodes and plural first light-absorbing portions. The flexible printed circuit board has a first edge and a second edge opposite to the first edge. The light-emitting diodes are disposed on the flexible printed circuit board near the first edge. The first light-absorbing portions are disposed on the flexible printed circuit board near the second edge, in which the first light-absorbing portions are alternately arranged with the light-emitting diodes.