Metal Oxide Light Absorbing Layer for Display Panel Reflectance
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Solution Overview
Problem
Existing display panels face challenges in reducing external light reflectance, which affects display quality, particularly on stepped electrode parts with high reflectivity, and current light blocking layers may compromise reliability or display performance.
Innovation Solution
A display panel design incorporating a light absorbing layer made of metal oxides, such as molybdenum oxide and tantalum oxide, directly on the first electrode, which overlaps the stepped electrode part and is covered by the pixel defining layer, reducing external light reflection without affecting the light emitting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking layer is used to reduce external light reflectance, then display quality is improved, but reliability or display performance may be compromised
Solution Approach 1:
The patent changes the material parameter of the light blocking layer from conventional materials to metal oxide materials (specifically molybdenum oxide and tantalum oxide). This material parameter change enables the layer to effectively block external light while maintaining compatibility with the organic electroluminescence device, thus improving display quality without compromising reliability or performance.
Solution Approach 2:
The patent employs composite material structure by combining metal oxide materials (molybdenum oxide and tantalum oxide) in the light blocking layer. This composite approach leverages the complementary properties of different metal oxides to achieve superior light blocking performance while ensuring device reliability and maintaining the performance of the organic electroluminescence device.
2Object-affected harmful factors
If a light absorbing layer is added to reduce reflectance, then display quality is enhanced, but device complexity increases
Solution Approach 1:
The light blocking layer in the patent serves multiple functions simultaneously: it blocks external light to reduce reflectance, maintains compatibility with the organic electroluminescence device structure, and does not interfere with the light emitting characteristics. This multi-functionality reduces the need for additional separate layers, thereby limiting the increase in device complexity while still achieving the desired light blocking effect.
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
The metal oxide light absorbing layer effectively reduces external light reflectance by 90% across various wavelengths, enhancing display quality and reliability by blocking external light without compromising the light emitting characteristics of the organic electroluminescence device.
Implementation Method 1
The metal oxide light absorbing layer effectively reduces external light reflectance by 90% across various wavelengths, enhancing display quality and reliability by blocking external light
Data Source
AI summary
A display panel includes a substrate including a circuit layer, an insulation layer on the substrate, the insulation layer defining a hole, a first electrode on the insulation layer, the first electrode being electrically connected to the circuit layer in the hole, a light absorbing layer on the first electrode and overlapping the hole, a pixel defining layer on the insulation layer and defining an opening through which a top surface of the first electrode is exposed, at least one organic layer including a light emitting layer in the opening, and a second electrode on the at least one organic layer.