Transparent Display Anode Layout for Lower Darkened Subpixel Visibility
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Solution Overview
Problem
Transparent display devices suffer from defects in the light emitting area due to moisture and oxygen permeation, leading to darkening of subpixels, and the reduced light transmittance is exacerbated by anode connection lines, which also contribute to greenhouse gas emissions during manufacturing.
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 a light emitting device with anode electrodes spaced apart, and an anode connection line extending through a contact hole to connect these electrodes, minimizing darkening and reducing manufacturing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting area is reduced to enhance transparency, then light transmittance is improved, but the visibility of darkened subpixels due to moisture or oxygen permeation is exacerbated
Solution Approach 1:
The anode electrode is divided into multiple segments (first anode electrode and second anode electrode) that are spaced apart from each other. This segmentation allows the light emitting area to be reduced while maintaining functional integrity, as each segment can operate independently. The spaced-apart configuration reduces the overall darkened area while preserving light transmittance properties.
Solution Approach 2:
Instead of providing a continuous anode electrode across the entire display area, only partial anode electrodes are provided in specific regions. This partial action approach reduces the total area occupied by non-transparent elements, thereby improving light transmittance while minimizing the visibility of potential defects.
2Reliability
If anode connection lines are added to connect divided anode electrodes, then electrical connectivity is improved, but light transmittance is reduced
Solution Approach 1:
The anode connection line is positioned locally in the non-transmissive area rather than spanning across the entire display area. This localized placement ensures that the connection line does not interfere with the light transmittance of the transmissive areas, while still providing the necessary electrical connectivity between the divided anode electrodes.
Solution Approach 2:
The connection structure utilizes the vertical dimension by extending the anode connection line through contact holes from one substrate to another. This three-dimensional approach allows electrical connectivity to be achieved without adding horizontal elements that would block light transmission in the transmissive areas.
3Productivity
If traditional manufacturing processes are used, then production efficiency is maintained, but greenhouse gas emissions increase
Solution Approach 1:
The display structure is segmented into distinct functional areas (transmissive areas and non-transmissive areas) with different manufacturing requirements. This segmentation allows for optimized manufacturing processes in each area, potentially reducing overall material usage and energy consumption while maintaining production efficiency.
Solution Approach 2:
The patent modifies structural parameters (such as the spacing and configuration of anode electrodes and connection lines) to achieve both functional requirements and environmental goals. By changing these parameters, the design enables reduced material usage and simplified manufacturing processes that lower greenhouse gas emissions without sacrificing productivity.
Data Source
AI summary
A transparent display device includes a first substrate including a first transmissive area and a second transmissive area, each configured to 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. 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.