Dual Blue Pixel Display Device for Color Gamut and Power Optimization

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Solution Overview

Problem

Existing organic electroluminescence display devices face challenges in achieving reduced power consumption and extended lifetime while maintaining enhanced color reproducibility and efficiency.

Innovation Solution

A display device configuration with two blue pixels having different y-values in the xy chromaticity coordinate system is implemented, allowing for expanded color gamut and reduced power consumption by selectively using blue pixels with higher light-extraction efficiency, and omitting or reducing the density of color filters for blue pixels with lower y-values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single blue pixel configuration is used, then the device complexity is low, but the color gamut is limited and power consumption cannot be optimized

Engineering Contradiction:

Improvecolor gamutVSAvoidpixel structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The blue pixel region is segmented into two distinct blue pixels (first blue pixel and second blue pixel) with different y-values in the xy chromaticity coordinate system. This segmentation allows the display device to extract blue light beams with different color characteristics, thereby expanding the color gamut while maintaining a relatively simple overall pixel structure that does not require complex additional components.

Inventive Principle:

Principle #1Segmentation

2Reliability

If color filters are provided for all blue pixels, then color purity is improved, but light-extraction efficiency decreases and power consumption increases

Engineering Contradiction:

Improvecolor purityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Different quality treatments are applied to different blue pixels: the first blue pixel is provided with a color filter to ensure high color purity, while the second blue pixel omits the color filter or uses a reduced-density color filter to maintain high light-extraction efficiency. This local differentiation allows the system to optimize for either color purity or energy efficiency depending on which blue pixel is activated, resolving the contradiction between color purity and power consumption.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If blue pixels with different y-values are used, then color gamut is expanded, but manufacturing precision requirements increase

Engineering Contradiction:

Improvecolor gamutVSAvoidchromaticity control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The invention utilizes parameter changes in the organic electroluminescence materials themselves to achieve different y-values in the xy chromaticity coordinate system. By selecting organic EL materials with inherently different emission characteristics for the first and second blue pixels, the desired chromaticity differentiation is achieved through material selection rather than complex structural variations or post-manufacturing adjustments, thereby reducing manufacturing precision requirements while still expanding the color gamut.

Inventive Principle:

Principle #35Parameter changes

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 color reproducibility, reduces power consumption, and extends the lifetime of light-emitting elements by optimizing blue pixel usage and light-extraction efficiency, achieving improved display performance and efficiency.

Implementation Method 1

a display device (so-called organic EL display device) employing organic electroluminescence elements (organic EL elements) is attracting attention. The organic electroluminescence element is a self-luminous element employing an organic electroluminescence (EL) phenomenon

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

organic electroluminescence elements are formed to have a 'light resonator structure (so-called microcavity structure)' that allows light of the respective colors generated by the organic electroluminescence elements to be extracted after being subjected to resonance in the elements

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS9064450B2Display device, method for driving display device, and electronic apparatus

Publication Date: 2015.06.23 MAGNOLIA BLUE CORP

AI summary

Disclosed herein is a display device including: a red pixel configured to be provided with a red light-emitting element that generates red light; a green pixel configured to be provided with a green light-emitting element that generates green light; and two blue pixels configured to be provided with blue light-emitting elements that generate blue light and have the same structure, wherein a color filter is provided on a light-extraction side of at least one of the two blue pixels so that blue light beams having different y-values in an xy chromaticity coordinate system are extracted from the two blue pixels.