LED Display Panel Using Quantum Dot Color Conversion

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Solution Overview

Problem

Micro-LED display technology faces challenges with high production costs and low yield due to the need for hundreds of thousands of RGB LED grains for consistent luminous wavelength, leading to increased energy consumption and reduced battery life in wearable devices.

Innovation Solution

An LED display panel incorporating a thin film transistor array layer, a quantum dot light emitting layer, and an LED array layer, where the quantum dot light emitting layer is excited to emit at least two colors using excitation light from the LED array, eliminating the need for complex RGB LED grain redistribution and incorporating a filter layer to manage excitation light wavelengths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If RGB LED grains are used for full color display, then color display capability is improved, but production cost increases and yield decreases

Engineering Contradiction:

Improvecolor display capabilityVSAvoidproduction cost and yield

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent introduces a quantum dot layer as an intermediary between the blue LED and the color display. The quantum dot layer converts the blue light into red and green wavelengths, enabling full-color display without requiring separate red and green LED grains. This mediator approach simplifies the LED array structure while maintaining color display capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the wavelength parameters of light by using quantum dots with specific size ranges (20-40nm for red, 30-50nm for green) to convert blue light (430-480nm) into red and green wavelengths. By controlling the quantum dot size and composition, the light emission parameters are precisely tuned to achieve full-color display with a single blue LED wavelength source.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If hundreds of thousands of RGB LED grains are embedded for consistent luminous wavelength, then luminous wavelength consistency is improved, but device complexity increases

Engineering Contradiction:

Improveluminous wavelength consistencyVSAvoiddevice complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent extracts the color generation function from the LED grains themselves and relocates it to a separate quantum dot layer. Instead of requiring each LED grain to emit its own specific color wavelength, the system uses a single blue LED wavelength source and extracts red and green wavelengths through quantum dot conversion, dramatically reducing the number of components needed.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The quantum dot layer serves multiple functions simultaneously: it converts blue light to red, converts blue light to green, and maintains luminous wavelength consistency across the display. This multi-functional approach replaces the need for separate red, green, and blue LED grains, simplifying the overall device structure while achieving the same color display functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If micro-LED technology is used for high brightness display, then brightness is improved, but energy consumption increases

Engineering Contradiction:

ImprovebrightnessVSAvoidenergy consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent converts the high energy consumption characteristic of micro-LED technology into a benefit by using the blue LED's high-energy photons to excite quantum dots, which then emit red and green light. This energy conversion process through quantum dot photoluminescence is more efficient than directly driving separate red, green, and blue LEDs, as it eliminates the need for three independent high-power LED drivers per pixel.

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 significantly reduces production costs, improves yield, and decreases energy consumption while enhancing the service life of the display panel by achieving full color display with reduced complexity and increased luminous efficiency.

Implementation Method 1

when the LED array layer emits excitation light, the quantum dot light emitting layer is excited to emit light of at least two colors

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

the filter layer is used to filter at least a portion of the excitation light, the wavelength of the excitation light is 330-480 nm

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS10276756B2LED display panel

Publication Date: 2019.04.30 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present disclosure discloses an LED display panel including at least a thin film transistor array layer, a quantum dot light emitting layer, and an LED array layer arranged between the thin film transistor array layer and the quantum dot light emitting layer, when the LED array layer emits excitation light, the excited quantum dot emits light to emit at least two colors of light. The present disclosure can reduce the production cost and greatly improve the production yield, and can effectively reduce the energy consumption of the display panel and improve the service life.