OLED Encapsulation Layer Edge Positioning for Non-Display Area Reduction
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Solution Overview
Problem
Existing organic light emitting diode (OLED) display devices face challenges in minimizing the peripheral non-display area to enhance the screen-to-body ratio while effectively encapsulating light emitting elements to prevent moisture and oxygen penetration.
Innovation Solution
The implementation of an encapsulation layer with a first inorganic layer and a second inorganic layer that extend wider than the organic layer, with edges positioned to coincide or be closer to the power line in the non-display area, effectively preventing moisture and oxygen penetration without increasing the non-display area, and a connecting member to electrically connect the power line and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer is extended to cover the power line in the non-display area, then moisture and oxygen barrier functionality is improved, but the non-display area increases
Solution Approach 1:
The encapsulation layer is designed with different edge positions in different regions: in the display area, it provides comprehensive coverage, while in the non-display area, the first edge is positioned to coincide with or be closer to the display area than the power line edge. This localized differentiation provides moisture and oxygen protection where needed (display area with light emitting elements) while minimizing the non-display area expansion.
2Area of stationary object
If the screen-to-body ratio is improved by reducing the non-display area, then the display area coverage is increased, but the moisture and oxygen protection may be compromised
Solution Approach 1:
The encapsulation layer structure provides enhanced protection in the display area where light emitting elements are located, while using a minimized configuration in the non-display area. The first edge positioning strategy ensures that the encapsulation layer covers all critical components (light emitting elements) while avoiding unnecessary extension into the non-display area, thus maintaining screen-to-body ratio.
Solution Approach 2:
The encapsulation layer acts as an intermediary barrier between the light emitting elements and the external environment (moisture and oxygen). By strategically positioning the first edge to coincide with or be closer to the display area than the power line edge, it provides effective protection to the sensitive light emitting elements while minimizing the overall footprint of the non-display area.
Data Source
AI summary
A display device includes a substrate having a display area and a non-display area. A light emitting element is disposed in the display area. An encapsulation layer is configured to cover the display area and encapsulate the light emitting element. A power line is disposed in the non-display area. A first edge of the encapsulation layer in the non-display area is disposed to coincide with an edge of the power line or is disposed closer to the display area than the edge of the power line.