Mask Plate Encapsulation Control for Narrow Bezel OLED
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Solution Overview
Problem
Existing encapsulation technologies for OLED devices result in a wide edge of the encapsulation film layer, which is not conducive to achieving a narrow bezel and can lead to encapsulation failure and increased production costs due to the mask shadow extending beyond the desired area, thereby shortening the device's service life.
Innovation Solution
A mask plate design with a first blocking area, a first opening area, and at least one encapsulation control area that forms a continuous curved encapsulation layer, reducing the width of the edge of the encapsulation film layer by extending the water and oxygen intrusion path, allowing for a narrower bezel without compromising the encapsulation effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional mask plate with a simple opening area is used for encapsulation, then the encapsulation process is simple, but the edge of the encapsulation film layer becomes wide due to mask shadow, which is not conducive to achieving a narrow bezel
Solution Approach 1:
The mask plate is segmented into multiple functional areas: a first opening area for forming the encapsulation film layer, a first blocking area surrounding the opening area, and at least one encapsulation control area with second opening areas and second blocking areas. This segmentation allows different regions to serve different purposes in controlling the encapsulation film formation, enabling narrow bezel while maintaining encapsulation effectiveness.
Solution Approach 2:
Different areas of the mask plate are designed with different properties: the first opening area allows film formation, the first blocking area prevents film formation at the edge, and the encapsulation control area with alternating second opening and blocking areas creates a patterned structure. This local differentiation enables precise control over the encapsulation film edge profile.
2Reliability
If the mask shadow extends beyond the desired area to ensure complete encapsulation, then encapsulation reliability is improved, but the width of the encapsulation film edge increases, preventing narrow bezel design
Solution Approach 1:
The encapsulation control area creates a continuous curved shape in the encapsulation film layer through its pattern of alternating second opening areas and second blocking areas. This curved profile allows the film to extend further along the edge path without increasing the linear width, thereby maintaining narrow bezel while ensuring complete encapsulation coverage.
Solution Approach 2:
The invention transitions from controlling encapsulation in a simple linear manner to using a two-dimensional patterned approach with alternating opening and blocking areas. This dimensional approach allows the encapsulation film to follow a curved path, effectively increasing the encapsulation coverage area without proportionally increasing the linear width.
3Reliability
If the encapsulation control area overlaps with the circuit bonding area, then complete encapsulation coverage is achieved, but the circuit bonding area is blocked, affecting device assembly and increasing production costs
Solution Approach 1:
The mask plate design segments the encapsulation control function from the circuit bonding area by using alternating second opening areas and second blocking areas. This segmentation allows the encapsulation film to be formed in specific patterns while leaving the circuit bonding area accessible, enabling both complete encapsulation and ease of assembly.
Data Source
AI summary
A mask plate, a display panel and an encapsulating method thereof, which are used for reducing the width of an edge of a packaging film layer, thereby realizing a narrow bezel. The mask plate includes a first blocking area, a first opening area and at least one encapsulation control area, wherein an edge of an orthographic projection, on a display panel, of the first opening area surrounds a display area of the display panel; the encapsulation control area surrounds the first opening area, and includes a plurality of second opening areas and a plurality of second blocking areas which are arranged alternatively; the first blocking area surrounds the first opening area, is between the first opening area and the encapsulation control area, and has no overlapping area with the encapsulation control area.