Dual Blue Subpixel OLED Drive Mode Switching

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Solution Overview

Problem

Organic light emitting display devices face challenges in achieving high energy efficiency and long usage life, particularly with blue-color organic light emitting materials, where deep blue materials offer improved color reproducibility but poor energy efficiency, while sky blue materials have higher energy efficiency but inferior color reproducibility.

Innovation Solution

The device incorporates a display panel with red, green, and two types of blue sub-pixels, using a control unit to adjust the drive mode between a first blue drive mode, a second blue drive mode, and a mixed drive mode based on image data, distinguishing areas for sky blue and deep blue emission to optimize energy efficiency and color reproducibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If sky blue-color organic light emitting material is used, then energy efficiency is improved, but color reproducibility deteriorates

Engineering Contradiction:

Improveenergy efficiencyVSAvoidcolor reproducibility

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The blue sub-pixel is divided into two independent types: first blue sub-pixels using sky blue-color organic light emitting material and second blue sub-pixels using deep blue-color organic light emitting material. This segmentation allows the system to selectively use sky blue sub-pixels for energy-efficient display and deep blue sub-pixels for high color reproducibility display, resolving the contradiction between energy efficiency and color reproducibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control unit dynamically switches between first blue drive mode (using sky blue sub-pixels) and second blue drive mode (using deep blue sub-pixels) based on image data characteristics. This dynamic operation allows the system to adapt to different display requirements, achieving both high energy efficiency and excellent color reproducibility at different times

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If deep blue-color organic light emitting material is used, then color reproducibility is improved, but energy efficiency deteriorates

Engineering Contradiction:

Improvecolor reproducibilityVSAvoidenergy efficiency

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The blue sub-pixel is divided into two independent types: first blue sub-pixels using sky blue-color organic light emitting material and second blue sub-pixels using deep blue-color organic light emitting material. This segmentation allows the system to selectively use deep blue sub-pixels for high color reproducibility display while using sky blue sub-pixels for energy-efficient display, resolving the contradiction between color reproducibility and energy efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If dual blue sub-pixel structure is implemented, then device complexity increases, but display quality improves

Engineering Contradiction:

Improvedisplay qualityVSAvoiddevice complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Both first blue sub-pixels and second blue sub-pixels are integrated into the same display panel structure and can be controlled by the same control unit. The dual blue sub-pixel structure serves multiple functions: energy-efficient display, high color reproducibility display, and extended usage life, justifying the increased device complexity through enhanced multi-functionality

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 approach enhances energy efficiency, extends the usage life of the display device, and improves color reproducibility by selectively using the high luminous efficiency of sky blue sub-pixels and the deep blue sub-pixels based on image data requirements.

Implementation Method 1

The organic light emitting display device may include an organic light emitting material corresponding to red, green, and blue light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS9928804B2Organic light emitting display device with first and second blue sub-pixels

Publication Date: 2018.03.27 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting display device, including a display panel including red, green, first blue, and second blue sub-pixels, a data drive unit configured to receive an image signal and output data output signals, a de-multiplexer circuit configured to distribute data output signals to the data lines connected to the red, green, and the first blue sub-pixels, in response to receiving a first blue drive selection signal, or to the data lines connected to the red, green, first blue, and the second blue sub-pixels, in response to receiving a mixed drive selection signal, and a control unit configured to process a raw image data into the image signal, provide the image signal to the data drive unit, and provide the first blue drive selection signal or the mixed drive selection signal to the de-multiplexer circuit in a frame unit of the raw image data.