Display Device Recessed Substrate for Sealing Member Curing
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Solution Overview
Problem
The bonding force between substrates in display devices is not adequately enhanced, leading to defective bonding due to insufficient curing of the sealing part and filling member during the curing process, which affects the durability and display quality.
Innovation Solution
A display device design that includes a recessed portion on the second substrate, a partition wall, and a sealing member, where the recessed portion and partition wall are adjacent to the active region, allowing the sealing member to cure independently of the filling member, thereby ensuring complete curing and enhanced bonding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sealing part and filling member are cured simultaneously, then the curing process is simplified, but the bonding force between substrates is insufficient and defective bonding occurs
Solution Approach 1:
The curing process is segmented into two distinct stages: first curing the sealing part to form a stable bonding structure, then curing the filling member in the recessed portion. This segmentation ensures that the sealing part achieves sufficient bonding force before the filling member is introduced, preventing defective bonding while maintaining process efficiency.
Solution Approach 2:
The sealing part is cured in advance before the filling member is applied. The recessed portion is prepared in advance to receive the filling member after the sealing part has set. This preliminary action ensures that the sealing part forms a stable bonded structure first, providing a reliable foundation for subsequent filling member curing.
2Productivity
If the filling member is applied before the sealing part is fully cured, then the inner space is filled earlier, but the filling member interferes with the curing of the sealing part causing peeling
Solution Approach 1:
The sealing part is allowed to cure completely in the peripheral area before the filling member is applied to the recessed portion. This preliminary curing action prevents the filling member from interfering with the sealing part's curing process, eliminating peeling issues while maintaining efficient production timing.
Solution Approach 2:
The recessed portion acts as an intermediary structure that separates the sealing part and filling member in space. By providing a dedicated recessed area for the filling member, the design prevents direct contact between the uncured filling member and the sealing part, allowing independent curing of both components without mutual interference.
3Ease of manufacture
If a flat second substrate is used, then the manufacturing process is simpler, but the filling member cannot be properly contained and bonding is defective
Solution Approach 1:
Instead of making the entire second substrate complex, only a local recessed portion is formed in the peripheral area to contain the filling member. The majority of the substrate remains flat for simple manufacturing, while the localized recessed area provides the necessary precision for proper filling member containment and bonding.
Solution Approach 2:
The surface geometry of the second substrate is modified by creating a recessed portion with specific depth and dimensions. This parameter change in the local area allows the filling member to be properly contained and cured, improving bonding precision without significantly complicating the overall manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures complete curing of the sealing member before contact with the filling member, preventing peeling and enhancing the bonding force between substrates, resulting in a display device with improved durability and display quality.
Implementation Method 1
During the curing of the sealing part and the filling member, if the sealing part is not sufficiently cured to be able to enclose the floating filling member, defective bonding of the upper substrate and the lower substrate by the sealing part may occur.
Implementation Method 2
a recessed portion overlapping the peripheral region is defined in a rear surface of the second substrate facing the display element layer, and a part of the filling member is disposed in the recessed portion
Data Source
AI summary
Provided is a display device including a first substrate including an active region and a peripheral region, a circuit element layer on the first substrate and including insulating layers and a transistor, a display element layer on the circuit element layer and including a pixel-defining layer having an opening defined therein, a light-emitting element including a first electrode exposed by the opening, a second electrode, and a light-emitting layer disposed between the first and second electrodes, and a partition wall overlapping the peripheral region, a second substrate disposed on the display element layer, a sealing member overlapping the peripheral region and defining an inner space, and a filling member disposed in the inner space, wherein a recessed portion overlapping the peripheral region is defined in a rear surface of the second substrate facing the display element layer, and a part of the filling member is disposed in the recessed portion.