Active Illuminating Display Panels Using Quantum Dot Color Conversion

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Solution Overview

Problem

Active illuminating display panels using OLEDs or QLEDs face a short lifecycle due to the high energy of blue light photons, which causes decay in high molecular organic materials.

Innovation Solution

The display panel design incorporates a substrate with a driving array layer featuring distinct areas for red, green, and blue sub-pixels, utilizing photoluminescence quantum dots and conversion materials to emit red and green light instead of blue, reducing photon energy and extending panel lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If blue light is emitted directly from the blue sub-pixel area using OLED or QLED, then the display achieves full color RGB output, but the high energy blue light photons cause decay of high molecular organic material in the light-emitting layer, reducing the panel lifecycle

Engineering Contradiction:

Improveblue light emissionVSAvoidpanel lifecycle

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

Instead of emitting blue light directly from the light-emitting layer, the patent inverts the approach by having the light-emitting layer emit green light, which then excites quantum dots in the color filter to generate blue light. This reverses the traditional OLED/QLED emission path and protects the organic material from blue light degradation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces quantum dots as an intermediary substance between the green light source and the final blue light output. The quantum dots absorb green light photons and convert them to blue light photons, serving as a mediator that protects the organic light-emitting layer from direct blue light exposure while still achieving blue color output.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If blue light photons are used to excite the color filter to achieve full color display, then the display can show RGB colors, but the high energy photons accelerate the decay of organic materials in the light-emitting layer

Engineering Contradiction:

Improvefull color display capabilityVSAvoidmaterial stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the emission wavelength parameter of the light-emitting layer from blue (high energy) to green (lower energy). This parameter change reduces the photon energy that interacts with the organic material, thereby improving material stability while maintaining full color display capability through quantum dot conversion.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potentially harmful high energy blue light into a beneficial lower energy green light source. The green light serves as a safer excitation source that doesn't degrade the organic material, while the quantum dots convert this green light into the required blue light for display, turning a harmful factor into a beneficial solution.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 allows for full-color RGB display while minimizing the decay of high molecular organic materials, thereby extending the lifecycle of the active illuminating display panel.

Implementation Method 1

a first illuminating pattern configured on the first area of the driving array layer, wherein the first illuminating pattern is made of a plurality of photoluminescence quantum dots

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

a second illuminating pattern configured on the third area of the driving array layer, wherein the second illuminating pattern is made of conversion illuminating material of a nanoparticle form, and each of the nanoparticles includes inorganic material and rare-earth ions doped in the inorganic material

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS10700138B2Active illuminating display panels and manufacturing methods thereof comprising plural illuminating patterns providing plural color lights

Publication Date: 2020.06.30 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

The present disclosure relates to an active illuminating display panel and a manufacturing method thereof. The light-emitting layer is configured to emit the red light or the green light instead of the blue light. The energy of the red light photons and the green light photons is lower than the energy of the blue light photons. As such, the high molecular organic material in the light-emitting layer may not decay easily and the lifecycle of the active illuminating display panel may be extended.