Light Source Module with Integrated Reflective Portion for Backlight Units

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Solution Overview

Problem

The edge type backlight unit with light emitting diode packages faces limitations in thickness reduction and heat dissipation, hindering the use of highly efficient light emitting diode chips and resulting in a less efficient light utilization.

Innovation Solution

A light source module with a light guide plate that includes a receiving portion for a light emitting diode chip, where the incident plane of the light guide plate faces the exit plane of the diode chip, and a reflective portion is formed on the diode chip to enhance light emission, improving luminous efficacy and allowing for a slim structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If light emitting diode packages are used in edge type backlight units, then power consumption is reduced and structure is slimmed, but thickness reduction is limited and heat dissipation deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidheat dissipation

Core Design Contradiction:

Use of energy by moving objectVSTemperature

Solution Approach 1:

The invention divides the backlight unit into distinct functional regions: a first light source module at the edge for illumination, and a second light source module integrated with the light guide plate for enhanced light extraction. This segmentation allows each module to be optimized independently for heat dissipation and light efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light guide plate serves as an intermediary element that receives light from the first light source module and redirects it to the second light source module position, enabling efficient light distribution while maintaining thermal management through separate mounting structures

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If light emitting diode packages are used in edge type backlight units, then power consumption is reduced and structure is slimmed, but thickness reduction is limited

Engineering Contradiction:

Improvepower consumptionVSAvoidthickness

Core Design Contradiction:

Use of energy by moving objectVSLength of stationary object

Solution Approach 1:

The invention transitions from traditional edge-only illumination to a hybrid configuration where light sources are positioned both at the edge and within the light guide plate structure, utilizing the Z-axis dimension for improved light distribution without increasing overall thickness

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The second light source module is integrated within the light guide plate structure itself, nesting the light emitting elements directly into the optical path rather than requiring separate external mounting space

Inventive Principle:

Principle #7Nested doll (Nesting)

3Shape

If light emitting diode packages are used in edge type backlight units, then structure is slimmed, but heat dissipation deteriorates

Engineering Contradiction:

ImprovestructureVSAvoidheat dissipation

Core Design Contradiction:

ShapeVSTemperature

Solution Approach 1:

The invention applies different structural configurations to different regions: the first light source module uses a conventional edge-mounting structure, while the second light source module utilizes an integrated structure with the light guide plate that provides superior heat dissipation pathways

Inventive Principle:

Principle #3Local quality

4Shape

If light emitting diode packages are used in edge type backlight units, then structure is slimmed, but light utilization efficiency decreases

Engineering Contradiction:

ImprovestructureVSAvoidlight utilization efficiency

Core Design Contradiction:

ShapeVSLoss of energy

Solution Approach 1:

The light guide plate continuously guides light from the first light source module to the second light source module position, ensuring that light energy is efficiently transmitted and utilized throughout the display area without interruption or waste

Inventive Principle:

Principle #20Continuity of useful action

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 enables a slim and efficient backlight unit with improved luminous efficacy by effectively guiding and reflecting light from the light emitting diode chips, addressing the limitations of heat dissipation and thickness reduction in existing edge type backlight units.

Implementation Method 1

a wavelength conversion portion formed on the light emitting diode chip

Methodology Applied

Scientific EffectWavelength conversion: Photoluminescence

Implementation Method 2

a reflective portion formed on the light emitting diode chip, wherein the reflective portion exposes at least one plane of the wavelength conversion portion to form an exit plane through which light emitted from the light emitting diode chip is discharged

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS10401556B2Light source module and backlight unit having the same

Publication Date: 2019.09.03 SEOUL SEMICONDUCTOR

AI summary

The present invention relates to a light source module, which has excellent lighting efficiency and is slim, and a backlight unit having the same. The present invention comprises a light emitting unit electronically connected to a substrate through a bottom surface; a wavelength conversion unit formed on the light emitting unit; and a reflection unit formed on the light emitting unit, wherein the reflection unit has a light emitting surface through which light from the light emitting unit is emitted, the light emitting surface being formed by exposing at least one surface of the wavelength conversion unit.