Non-Uniform Sealant Thickness for Display Bonding Integrity
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Solution Overview
Problem
In display devices, the thickness of the sealant can exceed the top surface of the display panel, causing the bonding region or fan-out region to be squeezed when a touch panel is attached, leading to potential failure during thermal shock tests.
Innovation Solution
The display device design includes a sealant with varying thickness sections, where the first section is between the top electrode and the driving substrate, and the second section is thicker, positioned away from the bonding region, preventing the sealant from protruding and squeezing the bonding area. The sealant flows towards the first region by capillarity action, ensuring the bonding region is not compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealant thickness is increased to ensure waterproofing, then the sealing performance is improved, but the bonding region is squeezed and structural integrity deteriorates
Solution Approach 1:
The sealant is designed with non-uniform thickness distribution, where the first section has thickness T1 in the bonding region and the second section has thickness T2 in the periphery. This local quality variation allows the sealant to provide adequate waterproofing in the periphery while avoiding excessive thickness in the bonding region, thus resolving the contradiction between sealing performance and bonding integrity.
Solution Approach 2:
The sealant is divided into multiple sections (first section and second section) with different thickness characteristics. The first section is located in the bonding region with thickness T1, while the second section is in the periphery with thickness T2 > T1. This segmentation allows each section to fulfill its specific function optimally without compromising the other.
2Strength
If the sealant thickness is reduced to avoid squeezing the bonding region, then the bonding region integrity is maintained, but the waterproofing performance deteriorates
Solution Approach 1:
The sealant employs local quality differentiation where the periphery section (second section) has greater thickness T2 to ensure robust waterproofing, while the bonding region section (first section) maintains appropriate thickness T1 to avoid squeezing. This localized approach allows the system to achieve both waterproofing and bonding integrity simultaneously.
Solution Approach 2:
By segmenting the sealant into distinct sections with different thickness characteristics, the design ensures that the periphery receives adequate sealing thickness while the bonding region receives only the necessary minimum thickness, preventing both squeezing and inadequate sealing.
3Ease of manufacture
If uniform thickness sealant is used to simplify manufacturing, then the manufacturing process is improved, but the bonding region is squeezed during assembly
Solution Approach 1:
The sealant is designed with predetermined non-uniform thickness distribution where the first section in the bonding region has thickness T1 and the second section in the periphery has thickness T2 > T1. This local quality variation is achieved through controlled application methods such as mask coating or multi-step coating processes, allowing the design to avoid bonding region squeezing while maintaining manufacturability.
Solution Approach 2:
The sealant thickness distribution is predetermined and planned before the actual sealing process. The first section and second section are designed with specific thicknesses in advance, and the coating process is configured to deposit sealant in the correct thickness distribution from the outset, avoiding the need for post-application adjustments.
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 prevents failure of the bonding region circuit and maintains waterproofing, effectively addressing the issue of sealant thickness and thermal shock resistance in display devices.
Implementation Method 1
coating a sealant of the display panel in the second region of the channel such that the sealant flows towards the first region from the second region
Data Source
AI summary
A display device includes a display area and a periphery area. The display device includes a display panel and a touch module located on the display panel. The display panel includes a driving substrate, a display medium layer located on the driving substrate, a top electrode located on the display medium layer, and a sealant surrounding the display medium layer and the top electrode. The sealant includes a first section and at least one second section connected with the first section. The first section is located between the top electrode and the driving substrate. A thickness of the second section is greater than a thickness of the first section. The touch module includes a bonding region located in the periphery region. An orthogonal projection of the bonding region on the driving substrate overlaps an orthogonal projection of the first section on the driving substrate.