Ga-Doped ITO Anode Structure for OLED Microcavity Color Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting devices (LEDs) face challenges in displaying accurate color spectra due to the micro cavity effect between the reflection film, anode, and cathode, leading to wavelength splitting and changes in luminance and color coordinates.
Innovation Solution
The proposed solution involves forming a display device with a substrate, transistors, pixel electrodes, emission layers, and a common electrode, where the first pixel electrode includes a sequential stack of ITO/Ag/ITO layers with a crystalline upper ITO surface and an amorphous Ga-doped ITO second layer to adjust the anode thickness and optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer layer is formed on the organic layer to adjust the distance between anode and cathode, then the micro cavity effect is improved, but the device complexity increases and organic material loss increases due to deposition mask requirements
Solution Approach 1:
The patent extracts the buffer layer function from the organic layer region and relocates it to the inorganic electrode region. By forming the buffer layer on the anode instead of on the organic emission layer, the patent eliminates the need for deposition masks while still achieving the desired cavity structure adjustment for improving display quality.
Solution Approach 2:
The patent uses the inorganic buffer layer as an intermediary between the anode and the organic emission layer. This buffer layer mediates the optical path and adjusts the cavity structure without requiring complex deposition processes on the organic layer, thereby simplifying the manufacturing process.
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 color purity and displaying quality by allowing for the adjustment of the optical path in the light-emitting device, reducing the issues of wavelength splitting and enhancing the accuracy of color representation.
Implementation Method 1
adjustment of the optical path in the light-emitting device... improving color purity and displaying quality... reducing the issues of wavelength splitting
Data Source
AI summary
Provided is a display device comprising a substrate; a plurality of transistors disposed on the substrate; a first pixel electrode, a second pixel electrode, and a third pixel electrode respectively connected to the transistors; a first emission layer disposed to overlap the first pixel electrode, a second emission layer disposed to overlap the second pixel electrode, and a third emission layer disposed to overlap the third pixel electrode; and a common electrode disposed on the first emission layer, the second emission layer, and the third emission layer, wherein the first pixel electrode includes a first layer, and a second layer disposed on the first layer and including a Ga-doped ITO.