Color Conversion Panel Blue Light Cutting Filter

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Solution Overview

Problem

Liquid crystal displays and organic light emitting diode displays experience significant light loss due to the presence of a color filter, leading to suboptimal display quality and efficiency.

Innovation Solution

A color conversion display panel is designed with a light blocking member and a blue light cutting filter, both having varying thickness regions, along with a transmission layer and an overcoat layer, to minimize light loss and improve surface flatness, allowing for a seamless placement of a polarization layer without defects. This configuration includes nanocrystals in the color conversion layers and a wire grid polarizer for enhanced light management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a color filter is used in liquid crystal displays or OLED displays, then color display is achieved, but light loss increases significantly

Engineering Contradiction:

Improvelight transmissionVSAvoidlight loss

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent changes the optical parameters of the display system by replacing the traditional color filter with a color conversion layer that converts blue light to red and green light. This parameter change in the light conversion mechanism reduces light loss while maintaining color display quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a color conversion layer containing phosphors or quantum dots that convert blue light wavelengths to red and green light wavelengths. This color change mechanism eliminates the need for absorptive color filters, thereby reducing light loss while achieving full-color display.

Inventive Principle:

Principle #32Color changes

2Productivity

If color conversion layers and transmission layers are disposed adjacent to each other, then light management is improved, but surface flatness deteriorates due to steps between layers

Engineering Contradiction:

Improvelight management efficiencyVSAvoidsurface flatness

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent introduces a light blocking member with varying thickness that extends in the vertical dimension to bridge the gap between adjacent color conversion layers and transmission layers. This dimensional extension fills the step differences and achieves surface flatness while maintaining the adjacent layer configuration for efficient light management.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The light blocking member is designed with asymmetric thickness, having a first thickness in a first region and a second thickness greater than the first thickness in a second region. This asymmetric design allows the light blocking member to selectively fill step differences between adjacent layers while maintaining optimal light blocking performance in different regions.

Inventive Principle:

Principle #4Asymmetry

3Reliability

If a polarization layer is disposed on an overcoat layer with steps, then the polarization layer develops defects and discontinuities, but removing the overcoat layer compromises the display structure

Engineering Contradiction:

Improvepolarization layer qualityVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary action by disposing the light blocking member between the color conversion layers and transmission layer before forming the overcoat layer. This preliminary placement of the light blocking member creates a flat underlying structure, allowing the overcoat layer to be formed uniformly without steps, thereby enabling defect-free polarization layer deposition while maintaining the complete display structure.

Inventive Principle:

Principle #10Preliminary action

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 solution effectively reduces light loss and improves the reliability and display quality by minimizing the step in the overcoat layer, enabling a defect-free placement of the polarization layer and enhancing the overall performance of the color conversion display panel and display device.

Implementation Method 1

a blue light cutting filter disposed on the color conversion substrate

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

a first color conversion layer and a second color conversion layer disposed on the blue light cutting filter and to include nanocrystals

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 3

a polarization layer disposed on the overcoat layer, and the polarization layer may include a wire grid polarizer

Methodology Applied

Scientific EffectPolarisation: Polarisation

Data Source

PatentUS11073718B2Color conversion panel having blue light cutting filter and display device including the same

Publication Date: 2021.07.27 SAMSUNG DISPLAY CO LTD

AI summary

An exemplary embodiment of the present disclosure provides a color conversion display panel including: a light blocking member and a blue light cutting filter disposed on a color conversion substrate; a first color conversion layer and a second color conversion layer disposed on the blue light cutting filter to include nanocrystals; and a transmission layer disposed on the color conversion substrate, wherein the blue light cutting filter overlaps side surfaces of the first color conversion layer, the second color conversion layer, and the transmission layer.