OLED Subsidiary Layer Thickness for Resonant Range Control
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Solution Overview
Problem
Organic light emission display devices face challenges in maintaining display quality due to variations in resonant ranges across different areas of the substrate, leading to issues like the 'reddish effect' when viewed from different angles, which affects color accuracy and overall image expression.
Innovation Solution
The implementation of a thin film deposition apparatus with a mask having varying slit lengths to form subsidiary layers of different thicknesses in the middle and side areas of the substrate, allowing for precise control of resonant ranges and color coordinates, thereby reducing the 'reddish effect' and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness subsidiary layer is formed across the entire substrate, then the manufacturing process is simple, but color accuracy deteriorates due to resonant range variations across different areas
Solution Approach 1:
The patent applies local quality by forming subsidiary layers with different thicknesses in different regions of the substrate. The central region has a first thickness while the peripheral region has a second thickness, allowing each region to be optimized for its specific resonant characteristics and viewing angles, thereby maintaining color accuracy across the entire display area.
Solution Approach 2:
The patent segments the substrate into distinct regions (central and peripheral) with different subsidiary layer thicknesses. This segmentation allows independent optimization of each region's optical properties, addressing the resonant range variations that occur across different areas of the substrate.
2Illumination intensity
If the subsidiary layer thickness is increased to expand the resonant range, then color coverage is improved, but the 'reddish effect' worsens when viewed from different angles
Solution Approach 1:
The patent uses local quality to address the reddish effect by providing different thicknesses of subsidiary layers in different regions. The central region's first thickness and the peripheral region's second thickness are specifically designed to control resonant ranges for different viewing angles, thereby suppressing the reddish effect while maintaining color coverage.
3Manufacturing precision
If different thicknesses of subsidiary layers are formed in different areas, then color accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent implements local quality with a practical structure that has different thicknesses in central and peripheral regions. This approach improves color accuracy by addressing resonant range variations while maintaining a relatively simple two-region structure that can be manufactured with standard techniques.
Solution Approach 2:
The patent segments the subsidiary layer into two distinct thickness regions (central and peripheral), which provides the necessary complexity to address color accuracy issues while avoiding excessive structural complexity. This binary segmentation is more manageable than continuous variation and can be implemented with standard manufacturing processes.
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 effectively adjusts the thickness of subsidiary layers to maintain consistent color emission across the substrate, minimizing the 'reddish effect' and improving the overall display quality of organic light emission devices by controlling resonant ranges and color coordinates.
Implementation Method 1
forming a first subsidiary layer on the middle area by means of the mask, forming a second subsidiary layer, which is different from the first subsidiary layer in thickness, in the first and second side areas by means of the mask
Implementation Method 2
a thin film deposition apparatus with a mask having varying slit lengths to form subsidiary layers of different thicknesses
Implementation Method 3
configured to adjust a resonant range
Data Source
AI summary
Disclosed is an organic light emission display device including; a substrate in which a first side area, a middle area, and a second side are sequentially defined in a first direction; a first electrode disposed on the substrate; a second electrode opposite to the first electrode; a red emission layer disposed between the first and second electrodes; a first subsidiary layer disposed between the red emission layer and the first electrode in the middle area, and configured to adjust a resonant range; and a second subsidiary layer disposed between the red emission layer and the first electrode respectively in the first and second side areas, and configured to adjust a resonant range. The first subsidiary layer is different from the second subsidiary layer in thickness.