Display Panel Color Control Layer Encapsulation

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Solution Overview

Problem

Display panels face challenges in extending the lifespan and improving light output efficiency, particularly due to issues with color control layers that suffer from color deviation and brightness reduction over time.

Innovation Solution

The implementation of a display panel design featuring a lower display substrate with light emitting elements and an upper substrate having pixel areas, color filters, and color control layers, where the second color control layer is encapsulated by an inorganic layer, and the weight percentage and number of quantum dots in the second color control layer are higher than in the first, enhancing light transmission and conversion efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If color control layers are used to convert light color, then color image generation is enabled, but color deviation and brightness reduction occur over time

Engineering Contradiction:

Improvecolor conversion capabilityVSAvoidcolor stability over time

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the material parameter of the color control layer from conventional organic dyes to quantum dots, which have superior color stability. The quantum dots maintain their photoluminescence properties over time, preventing color deviation and brightness reduction while maintaining color conversion capability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material structure by combining quantum dots with a resin matrix to form the color control layer. This composite structure provides both the color conversion functionality of quantum dots and the mechanical stability of the resin, solving the reliability issue of conventional organic color control layers.

Inventive Principle:

Principle #40Composite materials

2Productivity

If quantum dot layer is added for color conversion, then light output efficiency improves, but device complexity increases

Engineering Contradiction:

Improvelight output efficiencyVSAvoidlayer structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the color conversion function into the color control layer by incorporating quantum dots directly into the resin matrix of the color control layer. This integration eliminates the need for separate quantum dot layers while achieving the same light output efficiency improvement, thus reducing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Duration of action of stationary object

If encapsulation layer is applied to protect color control layer, then lifespan is extended, but light transmission is reduced

Engineering Contradiction:

Improvedisplay lifespanVSAvoidlight output intensity

Core Design Contradiction:

Duration of action of stationary objectVSIllumination intensity

Solution Approach 1:

The patent uses a thin inorganic encapsulation layer to protect the quantum dot color control layer. The thin film structure provides protection against moisture and oxygen ingress (extending lifespan) while minimizing light absorption and scattering (maintaining light transmission).

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent replaces conventional thick organic encapsulation layers with thin inorganic encapsulation layers. The inorganic material provides equivalent or superior protection with much thinner thickness, thereby extending lifespan without significantly reducing light transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enhances the lifespan and light output efficiency by minimizing color deviation and brightness reduction over time, improving display quality by effectively encapsulating the color control layers and optimizing quantum dot usage.

Implementation Method 1

The first color control layer may include a base resin and first quantum dots mixed with the base resin, and the second color control layer may include a base resin and second quantum dots mixed with the base resin

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS11495642B2Display panel including color control layer

Publication Date: 2022.11.08 SAMSUNG DISPLAY CO LTD

AI summary

A display panel including a lower display substrate including a light emitting element configured to generate source light, and an upper display substrate including first, second, and third pixel areas and a peripheral area adjacent thereto, in which the upper display substrate includes a base substrate, a first partition pattern disposed on a bottom surface of the base substrate, overlaps with the peripheral area, and has first, second, and third openings corresponding to the first, second, and third pixel areas, respectively, first, second, and third color filters disposed on the bottom surface of the base substrate and overlapping with the first, second, and third pixel areas, respectively, first, second, and third color control layers disposed on the first, second, and third color filters, respectively, and an encapsulation inorganic layer covering the second color control layer and exposing at least one of the first and third color control layers.