Transparent Display Light Emitting Layer Segmentation
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Solution Overview
Problem
Transparent display devices face issues with visibility differences between the display area and non-display area due to structural differences, which can lead to a peeling phenomenon and moisture permeation problems.
Innovation Solution
A transparent display device design where the light emitting layer extends into the non-display area, and a separating prevention portion with an uneven shape is used in the bezel edge portion, preventing separation and blocking moisture permeation paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting layer is extended to the end of the non-display area, then the visibility difference between display area and non-display area is reduced, but the light emitting layer may peel off due to swelling
Solution Approach 1:
The light emitting layer is divided into multiple segments along the extending direction, with separation grooves created between segments. This segmentation prevents continuous swelling-induced peeling while maintaining visual uniformity across the display and non-display areas.
Solution Approach 2:
The light emitting layer is configured with different structures in different regions: it extends continuously in the display area for uniform illumination, but is segmented with grooves in the non-display area to prevent peeling. This local differentiation resolves the contradiction between visibility and reliability.
2Strength
If an opaque dam portion is used to bond substrates, then substrate bonding is achieved, but aesthetic integration and transparency are deteriorated
Solution Approach 1:
The dam portion material is changed from opaque to transparent, allowing light to pass through and maintain the aesthetic appearance of the display device while still providing the necessary substrate bonding function. This resolves the contradiction between bonding strength and transparency.
3Illumination intensity
If the light emitting layer extends to the end of the panel, then visibility difference is reduced, but moisture permeation path is blocked causing swelling
Solution Approach 1:
Separation grooves are introduced into the light emitting layer at the end of the non-display area, segmenting it into multiple parts. This allows moisture to permeate through the grooves while preventing continuous swelling that would cause peeling, thus resolving the contradiction between visibility and moisture resistance.
Solution Approach 2:
The separation grooves act as intermediary channels that allow controlled moisture permeation while preventing uncontrolled swelling. These grooves mediate between the need for extended light emitting layer (for visibility) and the need to block moisture (for reliability).
Data Source
AI summary
Disclosed is a transparent display device comprising a first substrate including a display area in which light emitting elements with light emitting layers are disposed and a non-display area surrounding the display area, a second substrate facing the first substrate, and a dam portion disposed between the non-display area of the first substrate and the second substrate so as to surround the display area in a plan view, wherein the light emitting layer of the light emitting element extends from the display area over the first substrate to the end of the non-display area, and the light emitting layer may include a separating prevention portion disposed between the outer periphery of the dam portion and the end of the non-display area, in the plan view over the first substrate.