Transparent Display Pixel Structure for Uniform Solution Processing
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Solution Overview
Problem
The existing transparent display devices using electroluminescent technology face challenges in forming large-sized, high-definition displays due to limitations in the vacuum thermal evaporation process, which increases manufacturing costs and results in non-uniformity and color mixing issues.
Innovation Solution
A transparent display device design featuring a substrate with specific emission and transparent areas, where light-emitting diodes are arranged with auxiliary electrodes and light-emitting layers formed through a solution process, optimizing the size and transmittance of emission areas to prevent color mixing and enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum thermal evaporation process with fine metal mask is used to form light-emitting layers, then light-emitting layers can be formed in emission areas, but manufacturing costs increase and manufacturing precision deteriorates due to mask preparation, sagging, and shadow effects
Solution Approach 1:
The patent removes the fine metal mask from the vacuum thermal evaporation process entirely. Instead of using a mask to define emission areas, the light-emitting layers are formed directly in predetermined regions through solution processing, eliminating mask preparation costs and mask-related manufacturing defects such as sagging and shadow effects.
Solution Approach 2:
The patent replaces the mechanical vacuum thermal evaporation process with a solution processing method. This substitution eliminates the need for masks and vacuum equipment, allowing light-emitting layers to be formed through chemical deposition from solutions, thereby reducing manufacturing complexity and cost while improving uniformity.
2Manufacturing precision
If emission areas are made small to achieve high definition, then display resolution improves, but it becomes difficult to form light-emitting layers through evaporation process
Solution Approach 1:
The patent replaces the evaporation process with solution processing, which allows precise formation of light-emitting layers in small emission areas. The solution method enables better control over layer deposition in confined spaces, achieving high definition displays that are difficult to produce through traditional evaporation techniques.
Solution Approach 2:
The patent changes the formation method parameter from vacuum evaporation to solution processing. This parameter change allows for better control of light-emitting layer formation in small emission areas, improving both manufacturability and display definition by enabling precise material deposition at the molecular level through solution chemistry.
3Illumination intensity
If first transparent area has higher transmittance to maintain transparency, then transparency is improved, but less light is available for light-emitting diodes compared to second transparent area
Solution Approach 1:
The patent applies different transmittance characteristics to different transparent areas based on their functional requirements. The first transparent area has higher transmittance for viewing transparency, while the second transparent area has lower transmittance to provide sufficient light for LED operation. This local differentiation resolves the contradiction by optimizing each area for its specific purpose.
Solution Approach 2:
The patent divides the transparent area into multiple regions with different transmittance properties. By segmenting the transparent area into a first transparent area (higher transmittance) and a second transparent area (lower transmittance), the system simultaneously achieves both high transparency for viewing and sufficient light availability for LED operation in different locations.
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 enables the production of large-sized, high-definition transparent displays with improved luminance and reduced manufacturing costs, while preventing color mixing and maintaining uniformity, thus enhancing the overall image quality.
Implementation Method 1
an electroluminescent display device has wide viewing angles as compared with a liquid crystal display device because it is self-luminous
Data Source
AI summary
A transparent display device includes a substrate on which a pixel including first, second, and third emission areas and first and second transparent areas arranged along a first direction is defined, a light-emitting diode disposed in each of the first, second, and third emission areas and including a first electrode, a light-emitting layer, and a second electrode, and an auxiliary electrode extending in a second direction perpendicular to the first direction and electrically connected to the second electrode. The first emission area and the auxiliary electrode are disposed between the first transparent area and the second transparent area, and the second transparent area includes a first portion between the first emission area and the second emission area. Further, the first transparent area has a higher transmittance than the second transparent area.