Light Absorbing Layer for OLED Reflection Reduction
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Solution Overview
Problem
Existing display devices suffer from image quality degradation due to external light reflection from wire lines and electrodes, which is not effectively addressed by current technologies, particularly in organic light emitting display panels without polarizing films or plates, leading to increased manufacturing costs and processing time.
Innovation Solution
A display device and manufacturing method that incorporate a light absorbing layer, preferably made of metal oxides such as copper oxide, and a phase compensation layer, applied to areas like source/drain electrodes and gate lines to reduce external light reflection, achieving a reflectance of 10% or lower through a dual-layered structure with optimized thickness and refractive index matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light absorbing layer is added to reduce external light reflection, then image quality is improved, but device structure becomes more complex
Solution Approach 1:
The patent applies composite materials by combining the light absorbing layer (first material layer) with the underlying metallic layer (second material layer) to form a dual-layer structure. This composite structure achieves effective light absorption and reflection reduction while maintaining electrical conductivity, resolving the contradiction between improving image quality and increasing device complexity.
2Object-affected harmful factors
If a light absorbing layer is added to reduce external light reflection, then manufacturing cost increases, but image quality is improved
Solution Approach 1:
The light absorbing layer serves multiple functions simultaneously: it absorbs external light to reduce reflection, maintains electrical conductivity through the metallic layer beneath, and can be integrated into existing manufacturing processes. This multi-functionality reduces the need for additional separate components, thereby controlling manufacturing costs while improving image quality.
3Object-affected harmful factors
If a light absorbing layer is added to reduce external light reflection, then processing time increases, but image quality is improved
Solution Approach 1:
The patent merges the light absorbing layer formation with the existing electrode manufacturing process. The first material layer is deposited simultaneously or in integration with the formation of source/drain electrodes and gate lines, rather than as a separate subsequent step. This merging of processes adds minimal processing time while achieving the light reflection reduction goal.
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 solution significantly reduces external light reflection, improving image quality and manufacturing efficiency by eliminating the need for polarizing films or plates, while maintaining electrical conductivity and simplifying the manufacturing process.
Implementation Method 1
a light absorbing layer disposed on the metallic layer and configured to absorb at least part of light propagating toward the metallic layer
Data Source
AI summary
A method of preparing a display device including a plurality of pixels where a plurality of gate lines cross a plurality of data lines, respectively, each of the pixels including a thin film transistor (TFT) region and a display region, the method can include: forming a thin film transistor (TFT) in the TFT region; and forming a light emitting element for displaying images based on signals from the TFT in the display region, in which a metallic layer is disposed in the TFT region for electrical connection of the TFT; and a light absorbing layer configured to absorb at least part of light propagating toward the metallic layer is disposed on the metallic layer between the metallic layer and one of a gate insulating layer, an active layer, an interlayer dielectric layer and a substrate.