COB Light Source Plate with Integrated Quantum Dot Conversion

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Solution Overview

Problem

Conventional display devices using quantum dot sheets to enhance color reproducibility face challenges such as increased thickness and production costs, as well as reliability issues due to heat and moisture exposure.

Innovation Solution

A display device design where quantum dots are directly integrated into a light source plate with a Chip On Board (COB) configuration, featuring transparent resins, light conversion layers, and barrier layers to convert light wavelengths without a quantum dot sheet, enhancing color reproducibility while minimizing thickness and improving reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a quantum dot sheet is used to enhance color reproducibility, then color quality improves, but device thickness and production costs increase

Engineering Contradiction:

Improvecolor reproducibilityVSAvoiddevice thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The quantum dot layer is merged with the light source plate structure, where quantum dots are directly applied onto the light source plate surface. This integration eliminates the need for a separate quantum dot sheet, thereby reducing device thickness while maintaining color enhancement functionality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The light source plate serves multiple functions: it provides structural support, generates light, and acts as the substrate for the quantum dot layer. This multi-functionality reduces the need for additional components like separate quantum dot sheets,从而 reducing overall device thickness

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If a quantum dot sheet is used to enhance color reproducibility, then color quality improves, but production costs increase

Engineering Contradiction:

Improvecolor reproducibilityVSAvoidproduction cost

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

By merging the quantum dot layer application process with the light source plate manufacturing process, the patent eliminates the need for separate quantum dot sheet production and assembly steps. This integration reduces material costs and simplifies manufacturing, thereby lowering production costs while maintaining color quality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the quantum dot functionality from a separate sheet component and integrates it directly into the light source plate. This eliminates the need to purchase and assemble separate quantum dot sheets, reducing material costs and simplifying the supply chain

Inventive Principle:

Principle #2Taking out (Extraction)

3Illumination intensity

If a quantum dot sheet is used for light conversion, then color quality improves, but reliability decreases due to heat and moisture exposure

Engineering Contradiction:

Improvecolor qualityVSAvoidheat and moisture resistance

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent introduces an intermediate protective layer between the quantum dots and the external environment. This protective layer acts as a barrier against moisture and heat, protecting the quantum dots from degradation while allowing light conversion functionality to proceed

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective structure is designed in advance to prevent heat and moisture from reaching the quantum dots. By providing this protective barrier before exposure to harsh conditions, the patent ensures long-term reliability of the quantum dot layer while maintaining its color enhancement capabilities

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 configuration maintains color reproducibility without a quantum dot sheet, reducing the display device's thickness and production costs, while improving the reliability of the quantum dot-based light conversion system by protecting it from heat and moisture.

Implementation Method 1

a light conversion layer configured to convert a wavelength of light emitted from the LED chip, the light conversion layer substantially surrounding an outer surface of the transparent resin

Methodology Applied

Scientific EffectQuantum dot wavelength conversion: Photoluminescence

Implementation Method 2

a transparent resin disposed on the LED chip and substantially surrounding the LED chip

Methodology Applied

Scientific EffectLight refraction: Refraction

Data Source

PatentUS11906846B2Display device and manufacturing method therefor

Publication Date: 2024.02.20 SAMSUNG ELECTRONICS CO LTD

AI summary

A display device according to the disclosure comprises: a liquid crystal panel having a front surface configured to display an image; and a light source plate disposed at the rear of the liquid crystal panel configured to provide light to the liquid crystal panel, wherein the light source plate comprises: a printed circuit board having a mounting surface; an LED chip directly mounted on the mounting surface as a chip on board (COB); a transparent resin disposed on the LED chip to encompass the LED chip; a light conversion layer configured to convert the wavelength of light emitted from the LED chip and encompassing the outer peripheral surface of the transparent resin; and a barrier layer covering the light conversion layer from the outside.