Microcavity Display Device Using Phase Transition and Upconversion Units

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Solution Overview

Problem

Existing LCD and OLED display devices face challenges in manufacturing flexibility, yield, cost, and lifespan, particularly when applied in flexible display fields.

Innovation Solution

A display device with a substrate, pixels having microcavity structures, and a backlight module, where each pixel comprises sub-pixels with phase transition units and upconversion units, enabling light oscillation to produce visible light of multiple colors, and thin film transistors for electrical connections, allowing for color display without manufacturing limitations and overcoming yield, cost, and lifespan issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If LCD is applied in flexible display field, then flexibility is improved, but manufacturing difficulty increases

Engineering Contradiction:

ImproveflexibilityVSAvoidmanufacturing difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The display device is divided into independent pixel units, each containing sub-pixels with phase transition units and upconversion units. This segmentation allows each pixel to function independently, enabling flexible display configurations while simplifying the manufacturing process through modular assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes phase transition units that change optical properties in response to electrical signals, and upconversion units that convert infrared light to visible light. By changing the physical state and optical parameters of these units, the display achieves flexibility in both form and function without complicating manufacturing.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If OLED is used, then display performance is improved, but yield decreases and cost increases

Engineering Contradiction:

Improvedisplay performanceVSAvoidyield

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent introduces upconversion units as intermediary components that convert infrared light from the backlight module into visible light. This intermediary conversion process simplifies the display structure compared to OLED, improving manufacturing yield while maintaining display performance through the phase transition units' optical modulation capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the complex organic electroluminescent mechanism of OLED with a simpler inorganic-based system using phase transition units and upconversion units. This substitution maintains display performance while significantly improving manufacturing yield and reducing costs through more straightforward fabrication processes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If OLED is used, then display performance is improved, but lifespan decreases

Engineering Contradiction:

Improvedisplay performanceVSAvoidlifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent employs inorganic phase transition units and upconversion units that are more stable and durable than organic OLED materials. These units can be replaced or refreshed without replacing the entire display, effectively extending the display lifespan while maintaining performance through a more robust material foundation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The display device combines phase transition units with upconversion units to create a composite structure that leverages the stability of inorganic materials. This composite approach maintains the high display performance needed while significantly improving lifespan compared to pure organic OLED structures.

Inventive Principle:

Principle #40Composite materials

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 display device achieves color display without manufacturing constraints and addresses the limitations of existing technologies by efficiently utilizing microcavity structures and thin film transistors, enhancing flexibility and performance.

Implementation Method 1

each phase transition unit comprises a lower electrode, a phase transition layer and an upper electrode stacked successively

Methodology Applied

Scientific EffectPhase transition: Phase Change

Implementation Method 2

an upconversion unit between the two phase transition units. Colors of upconversion units of respective sub-pixels in each pixel are different from each other

Methodology Applied

Scientific EffectUpconversion: Photoluminescence

Data Source

PatentUS10242604B2Display device

Publication Date: 2019.03.26 BOE TECHNOLOGY GROUP CO LTD

AI summary

Embodiments of the invention disclose a display device, comprising a substrate, a plurality of pixels on the substrate and a backlight module located at a side of the substrate away from the pixels. Each pixel has a microcavity structure, in which the light emitted from the backlight module oscillates many times and exits as visible light of at least three colors, thereby enabling the display device to realize color display. Compared to the existing liquid crystal display device, this display device will not be limited by the manufacturing process when it is applied in the flexible display field. Compared to the existing organic electroluminescent display device, this display device will not have the problems of low yield, high cost and short life time, etc.