Hybrid OLED QD-LED Pixel Structure for Display Efficiency
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Solution Overview
Problem
Conventional OLED displays face challenges with blue phosphorescent materials having short lifetimes and unsaturated colors, while maintaining the performance of red and green phosphorescent materials, which limits the efficiency and color accuracy of OLED displays.
Innovation Solution
The implementation of a hybrid pixel structure combining OLED and QD-LED subpixels with shared layers, including a common hole transport layer, quantum dot layer, and organic emission layer with phosphorescent materials, along with a tandem hybrid pixel arrangement to enhance color performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blue phosphorescent OLED materials are used, then the display can achieve red and green phosphorescent material performance, but the blue material has short lifetime and unsaturated colors
Solution Approach 1:
The display is divided into separate OLED subpixels (red and green) and QD-LED subpixels (blue), allowing each component to use materials optimized for its specific function. The blue channel uses QD-LED with superior lifetime and color saturation, while red and green use phosphorescent OLED materials, eliminating the compromise of using inadequate blue phosphorescent materials in a full OLED display.
Solution Approach 2:
The patent employs a hybrid structure combining organic OLED materials and inorganic quantum dot materials in a unified display pixel architecture. This composite approach leverages the advantages of both material systems: the flexibility and phosphorescent efficiency of OLEDs for red/green channels, and the stability and color purity of QD-LEDs for the blue channel.
2Manufacturing precision
If conventional OLED structure is used, then manufacturing is simpler, but color accuracy and efficiency are limited by blue phosphorescent material performance
Solution Approach 1:
Each pixel is segmented into multiple subpixels with different emission mechanisms (OLED and QD-LED), allowing independent optimization of color accuracy for each channel. The blue QD-LED subpixel provides superior color saturation and accuracy that cannot be achieved with phosphorescent blue OLED materials alone.
Solution Approach 2:
The patent implements shared common layers (hole transport layer, electron transport layer, electrode layers) that serve multiple subpixel types simultaneously. This multi-functional design reduces overall device complexity by using universal components across different subpixel technologies while maintaining high color accuracy through specialized emission layers.
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 improves the color accuracy and efficiency of OLED displays by integrating blue-emitting QD-LED pixels with red and green phosphorescent OLED subpixels, addressing the limitations of blue phosphorescent materials and achieving enhanced performance across the RGB spectrum.
Implementation Method 1
quantum dot light emitting diodes (QD-LEDs) have been introduced as an alternative display technology
Implementation Method 2
An organic emission layer including a phosphorescent material is over the common hole transport layer in the OLED subpixel
Data Source
AI summary
Displays including hybrid pixels including an OLED subpixel and QD-LED subpixel are described. In an embodiment, OLED and QD-LED stacks are integrated into the same pixel with multiple common layers shared by the OLED and QD-LED stacks.