Transparent Display Anode Layout to Limit Subpixel Darkening
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Solution Overview
Problem
Transparent display devices face issues with moisture and oxygen permeation leading to darkening of subpixels, reducing the extent of the light emitting area and affecting light transmittance, while manufacturing processes contribute to greenhouse gas emissions.
Innovation Solution
The transparent display device incorporates a first and second transmissive area with a non-transmissive area in between, featuring a driving transistor and an anode connection line that connects adjacent anode electrodes, using materials with lower oxidation resistance and employing laser-cutting for defect repair, and includes a capacitor structure with specific electrode configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting area is reduced to accommodate transmissive areas, then light transmittance is improved, but the visibility of defective subpixels increases
Solution Approach 1:
The anode electrode is divided into multiple segments (first anode electrode and second anode electrode) that are spatially separated by the transmissive area. This segmentation allows the light emitting area to be reduced while maintaining functional integrity, as each segment can operate independently and defects in one segment do not necessarily affect the other.
Solution Approach 2:
An anode connection line is introduced as an intermediary element to electrically connect the divided anode electrodes across the transmissive area. This connection line serves as a mediator that maintains electrical continuity while allowing the light emitting areas to be separated, thus enabling both high transmittance and reliable operation.
2Device complexity
If conventional anode connection lines are used, then device complexity is reduced, but oxidation resistance deteriorates leading to darkening
Solution Approach 1:
The anode connection line is constructed using a composite material structure consisting of a first metal layer (such as aluminum or aluminum alloy) and a second metal layer (such as titanium nitride or tungsten). This composite structure provides both electrical conductivity and oxidation resistance, preventing the connection line from darkening while maintaining simplicity in the overall device design.
3Illumination intensity
If the anode electrode is divided into multiple electrodes, then light transmittance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The anode electrode is segmented into multiple independent electrodes that can be manufactured separately and then connected. This segmentation allows for more flexible manufacturing processes and reduces the precision requirements compared to manufacturing a single continuous electrode with openings, as each segment can be formed using standard deposition techniques without requiring complex lithography alignment.
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 minimizes the darkening of light emitting areas, maintains high light transmittance, and reduces greenhouse gas emissions by enhancing the anode connection line's durability and allowing for localized defect repair, thus improving the overall performance and environmental impact of the display.
Implementation Method 1
an anode connection line electrically connected to the driving transistor, and a light emitting device disposed on the driving transistor in the non-transmissive area
Implementation Method 2
a first substrate including a first transmissive area and a second transmissive area which transmit external light
Data Source
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AI summary
Disclosed is a transparent display device and a transparent display panel. The transparent display device comprises a first substrate including a first transmissive area and a second transmissive area which transmit external light, and a non-transmissive area disposed between the first transmissive area and the second transmissive area, a driving transistor provided in the non-transmissive area on the first substrate, an anode connection line electrically connected to the driving transistor, and a light emitting device disposed on the driving transistor in the non-transmissive area and configured to include an anode electrode including a first anode electrode and a second anode electrode, an emission layer, and a cathode electrode, wherein the first transmissive area and the second transmissive area are spaced apart from each other in a first direction, and the first anode electrode and the second anode electrode are disposed to be adjacent to each other in the first direction between the first transmissive area and the second transmissive area.