Display Device Photon Conversion Layer Wavelength Management

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

White OLED display devices face significant losses in light emitting efficiency due to low conversion efficiency during color conversion processes, limiting their overall performance.

Innovation Solution

A display device design incorporating a reflecting interface, a photon conversion layer, and a light filter layer, where the light filter layer transmits light within a specific wavelength range corresponding to the target color and reflects other wavelengths, and the photon conversion layer converts light beyond this range to the target color, enhancing color conversion efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a traditional color filter is used for color conversion in white OLED, then the device structure is simple, but the color conversion efficiency is low (around 33%)

Engineering Contradiction:

Improvedevice structure simplicityVSAvoidcolor conversion efficiency

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent divides the color conversion function into multiple components: a light filter layer with multiple wavelength selective layers (each targeting different color bands), a photon conversion layer with multiple conversion materials, and a reflecting interface. This segmentation allows systematic optimization of light management across different wavelength ranges, improving overall color conversion efficiency while maintaining manageable device structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a photon conversion layer as an intermediary between the light filter layer and the display light emergent direction. This intermediary converts photons from wavelengths that would otherwise be reflected away into useful visible light, acting as a mediator that transforms wasted energy into useful output, thereby improving color conversion efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If light beyond the first wavelength range is reflected away, then the light filter layer can transmit target color light effectively, but light energy is lost

Engineering Contradiction:

Improvetarget color light transmissionVSAvoidreflected light energy

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent converts the harmful effect of reflected light (which would otherwise be wasted energy) into a beneficial resource. The reflecting interface redirects reflected light to the photon conversion layer, which converts these photons into useful visible light that contributes to the display output. This transforms what was previously energy loss into a source of additional useful light

Inventive Principle:

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

Solution Approach 2:

Instead of discarding the reflected light energy, the patent recovers it through the photon conversion layer. The conversion layer captures photons that would have been lost and transforms them into visible light within the first wavelength range, effectively recovering energy that would otherwise be wasted and converting it into useful display output

Inventive Principle:

Principle #34Discarding and recovering

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 improves color conversion efficiency by utilizing light across more wavebands, resulting in higher brightness and lower power consumption, leading to better product performance.

Implementation Method 1

the light filter layer is structured to transmit light within a first wavelength range along the display light emergent direction and reflect the light within a second wavelength range

Methodology Applied

Scientific EffectLight filtering and reflection: Filter (optical)

Implementation Method 2

the photon conversion layer is structured to convert the transmitted light within a third wavelength range to the light within the first wavelength range

Methodology Applied

Scientific EffectPhoton conversion: Photoluminescence

Implementation Method 3

the reflecting interface is structured to reflect the light from the light filter layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS10103207B2Display device

Publication Date: 2018.10.16 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure relates to a display device in the field of display. The display device comprises a plurality of sub-pixel areas, each of which corresponds to one color, wherein the display device comprises a reflecting interface, a photon conversion layer, and a light filter layer arranged sequentially along a display light emergent direction; in the sub-pixel area corresponding to a target color: the light filter layer is structured to transmit light within a first wavelength range in the display light emergent direction and reflect the light within a second wavelength range, wherein the first wavelength range refers to the wavelength range corresponding to the target color, and the second wavelength range includes a visible light waveband excluding the first wavelength range; the reflecting interface is structured to reflect the light from the light filter layer; and the photon conversion layer is structured to convert the transmitted light within a third wavelength range to the light within the first wavelength range, the third wavelength range is a preset wavelength range beyond the first wavelength range and the second wavelength range includes the third wavelength range. The present disclosure can improve the color conversion efficiency of the display device.