Quantum Dot Subpixel Layout to Suppress Display Color Drift

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Solution Overview

Problem

In display devices with quantum dot light-emitting layers, self-absorption of light leads to a shift in emission wavelength characteristics, causing color drift, particularly in high gray scale displays.

Innovation Solution

Incorporating two subpixels per pixel with quantum dot light-emitting layers having different emission peak wavelengths, allowing for a staggered arrangement of subpixels with shorter and longer peak wavelengths to minimize self-absorption and reemission effects, thereby maintaining color accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a quantum dot light-emitting layer is provided in each subpixel, then color saturation and brightness are improved, but self-absorption of light occurs causing color drift

Engineering Contradiction:

ImprovebrightnessVSAvoidcolor accuracy

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The pixel is divided into two subpixels, each containing a quantum dot light-emitting layer with different emission peak wavelengths. This segmentation allows the first subpixel to emit light at a shorter wavelength and the second subpixel to emit light at a longer wavelength, thereby reducing self-absorption and preventing color drift while maintaining high brightness and color saturation.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If quantum dots with higher concentration are used to improve color saturation, then self-absorption increases causing greater color drift

Engineering Contradiction:

Improvequantum dot concentrationVSAvoidcolor accuracy

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

Different subpixels are assigned quantum dot light-emitting layers with different emission peak wavelengths. The first subpixel uses quantum dots emitting at a shorter wavelength while the second subpixel uses quantum dots emitting at a longer wavelength. This local differentiation in emission characteristics reduces self-absorption effects in each subpixel, allowing high quantum dot concentration to be maintained without severe color drift.

Inventive Principle:

Principle #3Local quality

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 effectively suppresses color drift and maintains color purity, especially in high gray scale regions, by adjusting the blend ratio and light-emission profiles of subpixels to prevent shifts in color tone.

Implementation Method 1

part of light emitted from the quantum dot light-emitting layer was self-absorbed in the quantum dot light-emitting layer

Methodology Applied

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

Implementation Method 2

quantum dots that absorb excitation light and emit light of a longer wavelength than the excitation light

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS12170346B2Display device

Publication Date: 2024.12.17 SHARP KK

AI summary

A first pixel configured to emit light of a first color, a second pixel configured to emit light of a second color; and a third pixel configured to emit light of a third color are provided. The first pixel includes a first subpixel and a second subpixel each including a quantum dot light-emitting layer. A light-emission peak wavelength of the second subpixel is longer than a light-emission peak wavelength of the first subpixel.