TFT LCD Encapsulation Sealant Distribution via Substrate Openings
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Solution Overview
Problem
Conventional TFT LCD devices face issues with moisture-induced degradation, operational instability, and poor encapsulation integrity due to challenges in applying a precise and evenly distributed sealant, leading to defects like mura and peeling, which affect performance and lifespan.
Innovation Solution
The formation of parallel openings in a second material layer on a substrate, exposing an underlying layer, allows for a sealant to be placed in a balanced manner, creating a sealant region that is perpendicular to the openings' direction, ensuring even contact and distribution between substrates, thereby enhancing adhesion and reducing voids and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is applied to encapsulate TFT LCD device, then encapsulation integrity is improved, but manufacturing precision deteriorates due to difficulty in achieving precise and even distribution
Solution Approach 1:
The sealant application process is segmented into discrete steps: forming openings in the organic polymer layer, placing sealant in openings, and allowing sealant to flow to contact the color filter substrate. This segmentation enables precise control of sealant placement and distribution, resolving the contradiction between achieving good encapsulation and maintaining manufacturing precision.
2Area of stationary object
If large volume and thickness of sealant are used, then encapsulation coverage is improved, but adhesion strength deteriorates due to peeling
Solution Approach 1:
The sealant structure is designed with local quality variations: the sealant is thickest at the openings where it is placed, providing strong anchoring, and tapers as it flows to contact the color filter substrate, ensuring intimate contact and adhesion. This gradient thickness distribution optimizes both coverage and adhesion strength.
3Reliability
If sealant is placed on organic polymer layer, then encapsulation is achieved, but manufacturing complexity increases due to selective removal process
Solution Approach 1:
The openings are formed in the organic polymer layer before sealant placement, creating pre-defined pathways that guide sealant flow and contact points. This preliminary action simplifies the subsequent sealant application process and ensures consistent encapsulation quality, offsetting the initial complexity of opening formation.
Data Source
AI summary
A structure for encapsulating a liquid crystal display device is disclosed. Openings are formed in a second material layer on a first substrate, exposing an underlying first material layer. The openings are substantially distributed over the perimeter of the first substrate. A sealant is placed in the openings, forming a sealant region for attachment of a second substrate to the first substrate. The sealant region is substantially perpendicular to a direction of length of the openings. In addition, the sealant contacts the first material layer and the second material layer through the openings.