Transparent Display Electrode Layout to Prevent Shadow Effects
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Solution Overview
Problem
Existing transparent display devices using electroluminescent technology face challenges in achieving large size and high definition due to limitations in forming light-emitting layers, particularly due to the small size of emission areas and increased manufacturing costs associated with the vacuum thermal evaporation process, which can lead to variations and shadow effects.
Innovation Solution
A transparent display device design that includes a substrate with defined emission and transparent areas, where the light-emitting diode has a specific electrode structure and an anti-deposition layer, allowing the light-emitting layer height to vary, and the second electrode is disposed over the entire substrate excluding the transparent area, optimizing the emission area size and preventing deposition in the transparent area to enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum thermal evaporation process is used to form light-emitting layers, then light-emitting layers can be formed in emission areas, but manufacturing costs increase and manufacturing variations occur
Solution Approach 1:
The patent extracts the light-emitting layer formation process from the vacuum thermal evaporation process by using a solution process instead. This eliminates the need for expensive masks and complex vacuum equipment, significantly reducing manufacturing costs while maintaining the ability to form light-emitting layers in specific emission areas through solution-based deposition methods
Solution Approach 2:
The patent replaces the mechanical vacuum thermal evaporation system with a solution-based deposition system. This substitution eliminates the need for vacuum chambers, masks, and complex mechanical deposition equipment, simplifying the manufacturing process and reducing costs while achieving the same functional result of forming light-emitting layers
2Measurement precision
If emission area size is reduced for high definition, then display resolution improves, but light-emitting layer formation becomes more difficult
Solution Approach 1:
The patent applies local quality by using solution-based deposition that can precisely control material placement at the emission area level. This allows independent control of light-emitting layer formation in each small emission area, enabling high-definition displays with reduced emission area sizes while maintaining ease of manufacture through the flexibility of solution processing
3Manufacturing precision
If vacuum thermal evaporation process is used, then light-emitting layers can be formed, but mask preparation costs increase and shadow effects occur
Solution Approach 1:
The patent extracts the light-emitting layer formation from the mask-based vacuum evaporation process by using solution-based deposition. This eliminates the shadow effects caused by mask blocking and removes the need for expensive mask preparation, while still achieving precise pattern formation through solution-controlled deposition in emission areas
Solution Approach 2:
The patent replaces the mechanical mask-based deposition system with a solution-based system that uses fluid dynamics and surface chemistry for pattern formation. This substitution eliminates shadow effects entirely and removes mask preparation costs, achieving comparable or superior pattern accuracy through solution processing control
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 design enables the creation of large-sized, high-definition transparent displays with improved luminance and reduced manufacturing costs by optimizing the light-emitting layer formation and preventing shadow effects, while maintaining high transmittance in the transparent areas.
Implementation Method 1
an electroluminescent display device has wide viewing angles as compared with a liquid crystal display device because it is self-luminous
Implementation Method 2
an anti-deposition layer provided in the first transparent area
Data Source
AI summary
A transparent display device includes a substrate on which a pixel including an emission area and a first transparent area is defined, and a light-emitting diode provided in the emission area and including a first electrode, a light-emitting layer, and a second electrode. The transparent display device further includes an anti-deposition layer provided in the first transparent area. The height of the light-emitting layer at an edge area of the emission area is higher than the height of the light-emitting layer at a center area of the emission area. Further, the second electrode is disposed over the entire surface excluding the first transparent area, and the height of the anti-deposition layer at an edge area of the first transparent area is higher than the height of the anti-deposition layer at a center area of the first transparent area.