OLED Display Organic Layer Thickness and Electrode Design
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) display devices face challenges in enhancing emission efficiency and viewing angle while maintaining cost-effectiveness, as increased thickness of hole injecting or hole transporting layers reduces emission efficiency and deteriorates luminance and chrominance properties, and the use of a color filter layer increases manufacturing costs.
Innovation Solution
The OLED display device incorporates a substrate with first and second pixel regions and a driving region, featuring first and second organic layers of different thicknesses, and a second electrode connected to an auxiliary electrode, which reduces sheet resistance and non-uniformity in luminance, and omits the color filter layer to improve luminance and chrominance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thickness of hole injecting layer or hole transporting layer is increased, then the manufacturing process is simplified, but the emission efficiency is reduced and luminance properties deteriorate
Solution Approach 1:
The patent extracts and eliminates the color filter layer from the conventional OLED structure. By removing this unnecessary component, the invention simplifies the manufacturing process while simultaneously improving emission efficiency, luminance viewing angle, and chrominance properties without the trade-off present in conventional designs
Solution Approach 2:
The patent optimizes the thickness parameters of the organic layers (hole injecting layer and hole transporting layer) to achieve the best balance between manufacturing ease and emission efficiency. By carefully controlling layer thickness within specific ranges, the invention improves luminance and chrominance properties while maintaining manufacturing simplicity
2Adaptability or versatility
If a color filter layer is added to improve viewing angle, then the viewing angle is enhanced, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the color filter layer from the conventional OLED structure. By removing this unnecessary component, the invention simplifies the manufacturing process while simultaneously improving emission efficiency, luminance viewing angle, and chrominance properties without the trade-off present in conventional designs
Solution Approach 2:
The patent makes the organic layers serve multiple functions simultaneously. The hole injecting layer and hole transporting layer are designed to provide both charge transport functionality and optical filtering effects, eliminating the need for a separate color filter layer while maintaining viewing angle and color properties
3Stability of the object's composition
If the sheet resistance is reduced, then the luminance uniformity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness parameters of the organic layers (hole injecting layer and hole transporting layer) to achieve the best balance between manufacturing ease and emission efficiency. By carefully controlling layer thickness within specific ranges, the invention improves luminance and chrominance properties while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies different thickness specifications to different regions or layers of the organic structure. By creating local variations in layer thickness (first organic layer with first thickness, second organic layer with second thickness), the invention achieves uniform luminance distribution while maintaining overall manufacturing simplicity
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 configuration enhances emission efficiency, luminance viewing angle, and color difference properties while reducing manufacturing costs by eliminating the need for a color filter layer and minimizing sheet resistance, resulting in improved optical properties and cost-effectiveness.
Implementation Method 1
the organic layer 20 may have different thicknesses in the first to third sub-pixels SP1 to SP3 based on an optical distance that can generate the microcavity
Implementation Method 2
when the lights reflected by the first and second electrodes 15 and 25 have the same wavelength as each other, they give rise to constructive interference called a microcavity
Implementation Method 3
The first electrode 15 as a reflective electrode has a triple-layered structure including two transparent conductive material layers ITO and a reflective layer REF between the two transparent conductive material layers ITO
Data Source
AI summary
An organic light emitting diode display device according to an embodiment includes a substrate having first and second pixel regions and a driving region between the first and second pixel regions; first electrodes disposed in the first and second pixel regions, respectively, on the substrate, the first electrodes being spaced apart from each other; a driving unit in the driving region; first and second organic layers on the first electrodes disposed in the first and second pixel regions, respectively, the first and second organic layer having a different thickness from each other; and a second electrode on the first and second organic layers.