Display Device Color Conversion Layer Anti-Reflective Dye

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Solution Overview

Problem

Display devices face challenges in achieving high color reproducibility and luminance due to light loss in polarization and color filter layers, particularly with the display of yellow light, leading to reduced luminance and inaccurate color representation.

Innovation Solution

A display device configuration incorporating a color conversion display panel with semiconductor nanocrystals and an anti-reflective layer that includes an adhesive layer with specific dyes and a low-reflective layer to absorb peripheral wavelengths, reducing light reflection and enhancing transmittance, thereby improving color reproducibility and luminance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional display device uses polarization layers and color filters to generate colors, then color display is achieved, but light loss occurs leading to reduced luminance and poor color reproducibility

Engineering Contradiction:

ImproveluminanceVSAvoidlight loss

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent uses a color conversion layer containing semiconductor nanocrystals that convert blue light to red and green light through photoluminescence. This eliminates the need for conventional color filters and polarization layers, thereby reducing light loss and improving luminance while maintaining color accuracy

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The patent changes the fundamental parameter of color generation from selective absorption (color filters) to selective emission (semiconductor nanocrystal photoluminescence). This parameter change enables higher luminance by avoiding the inherent light loss of absorption-based color filtering

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If a display device uses conventional color filters to achieve color reproduction, then color display is possible, but color reproducibility and luminance are degraded

Engineering Contradiction:

Improvecolor reproducibilityVSAvoidluminance

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

Semiconductor nanocrystals emit light at specific wavelengths determined by their size and composition, providing narrow emission spectra that enable precise color reproduction. The color conversion layer converts blue backlight to pure red and green wavelengths, achieving superior color accuracy compared to broad-spectrum color filters

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The patent uses composite semiconductor nanocrystal structures (core-shell configurations) to achieve precise color emission. The core-shell structure allows tuning of emission wavelengths while maintaining high quantum efficiency, thereby improving both color reproducibility and luminance

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If light is transmitted through multiple layers (polarization layer, color filter, etc.), then color display is achieved, but light reflection from external sources degrades image quality

Engineering Contradiction:

Improveexternal light reflectionVSAvoidimage quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies an anti-reflective coating on the display surface that converts harmful external light reflection into beneficial light absorption. The coating uses interference effects to cancel reflected light while allowing display light to pass through, thereby improving image quality in bright environments

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

The proposed configuration significantly improves color reproducibility and luminance by effectively blocking peripheral wavelengths and minimizing light reflection, resulting in balanced color tones and reduced external light reflection, as demonstrated by increased transmittance and color matching ratios.

Implementation Method 1

a color conversion layer including a semiconductor nanocrystal

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

the anti-reflective layer may absorb light having a first wavelength of 480 nm to 520 nm, light having a second wavelength of 580 nm to 620 nm, and light having a third wavelength of 680 nm to 720 nm

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS10831056B2Display device

Publication Date: 2020.11.10 SAMSUNG DISPLAY CO LTD

AI summary

An exemplary embodiment of the present invention provides a display device including: a thin film transistor array panel; an anti-reflective layer overlapping the thin film transistor array panel; and a color conversion display panel positioned between the thin film transistor array panel and the anti-reflective layer, wherein: the color conversion display panel may include a color conversion layer including a semiconductor nanocrystal and a transmissive layer; the anti-reflective layer may include an adhesive layer positioned on the color conversion display panel, a low-reflective layer overlapping the adhesive layer, and a base film positioned between the adhesive layer and the low-reflective layer. A dye is present in one of the layers of the anti-reflective layer.