OLED Display Electrode Micro-Cavity for Deep-Blue Color
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Solution Overview
Problem
OLED display devices with four color emitting layers face increased production costs and power consumption disadvantages due to the use of multiple deposition processes and fluorescent materials for deep-blue sub-pixels.
Innovation Solution
The OLED display device incorporates a substrate with pixel regions including red, green, first blue, and second blue sub-pixels, featuring a multi-layered structure for the second blue sub-pixel's electrode, using Ag or Ag alloy for the metal layer and ITO or IZO for transparent conductive materials, allowing the same blue phosphorescent organic material to display both light-blue and deep-blue colors, reducing the need for additional organic material deposition and lowering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If four color emitting layers (red, green, light-blue, deep-blue) are used to expand color display range, then color accuracy is improved, but manufacturing complexity and production cost increase due to requiring four separate deposition processes
Solution Approach 1:
The patent merges the light-blue and deep-blue emitting layers into a single deposition process by using a multi-layered electrode structure (first electrode layer + metal layer) to achieve different optical effects from the same blue phosphorescent material, thereby reducing the number of deposition processes from four to three while maintaining color accuracy
Solution Approach 2:
The patent applies local quality by creating different electrode configurations in different sub-pixel regions: the light-blue sub-pixel uses a standard first electrode structure, while the deep-blue sub-pixel uses a first electrode layer combined with a metal layer. This localized structural differentiation enables color differentiation without requiring separate material depositions for both blue shades
2Use of energy by moving object
If deep-blue fluorescent material is used to reduce power consumption, then power efficiency is improved, but manufacturing complexity increases due to requiring separate deposition processes for fluorescent and phosphorescent materials
Solution Approach 1:
The patent changes the optical parameter approach by using the same blue phosphorescent material but achieving different perceived colors (light-blue vs. deep-blue) through different electrode structures and micro-cavity effects. This eliminates the need to use different material types (fluorescent vs. phosphorescent) and their associated separate deposition processes, while still achieving the desired power efficiency and color differentiation
3Manufacturing precision
If metal layer is added to first electrode in deep-blue sub-pixel to achieve deep-blue color, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The metal layer is applied locally only in the deep-blue sub-pixel regions, not throughout the entire display. This localized application achieves the desired deep-blue color accuracy through micro-cavity effects in specific areas while keeping the overall device structure relatively simple and manageable
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 reduces power consumption and production steps while maintaining high efficiency and lifetime, enabling the display of accurate deep-blue colors through micro-cavity effects and using the same blue phosphorescent material for both light-blue and deep-blue sub-pixels.
Implementation Method 1
the same blue phosphorescent organic material to display both light-blue and deep-blue colors
Implementation Method 2
enabling the display of accurate deep-blue colors through micro-cavity effects
Data Source
AI summary
An OLED display device includes a substrate; pixel regions defined by gate and data lines, each pixel region including red, green, first blue and second blue sub-pixels; a TFT in each pixel region; a first electrode connected to the thin film transistor; an insulating layer exposing the first electrode; hole injecting and hole transporting layers stacked on the first electrode; red, green and blue emitting layer on the hole transporting layer, the red and green emitting layers respectively being in the red and green sub-pixels, and the blue emitting layer being in the first and second blue sub-pixels; electron transporting and electron injecting layers stacked on the red, green and blue emitting layers; and a second electrode on the insulating layer and the electron injecting layer, wherein the first electrode in the second blue sub-pixel has a multi-layered structure of the first electrode layer and at least one metal layer.