Large-format display assembly with segmented fastener pucks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-format displays are prone to visual defects such as parallax, vignetting, and Mura effects due to mechanical stress, which can cause deformation and affect the flatness and touch sensitivity of the display surface.
Innovation Solution
A display assembly with a carriage assembly secured to the interior surface of a cover sheet using a plurality of fastener pucks and a curable adhesive, which acts as compliant members to absorb mechanical stress and maintain the display stack in a fixed position, ensuring a flat and bezel-less exterior surface for touch input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cover sheet is clamped to the display assembly using a bezel, then the display stack is held in a fixed position, but the mechanical stress causes the cover sheet to deform and become non-flat
Solution Approach 1:
The patent divides the clamping function into multiple discrete fastener pucks distributed around the perimeter of the cover sheet, rather than using a continuous bezel. This segmentation allows stress to be distributed at discrete points, preventing the continuous mechanical stress that causes warping while still securing the display stack in position.
Solution Approach 2:
The patent introduces an intermediary layer (adhesive or compliant material) between the fastener pucks and the cover sheet interior surface. This intermediary absorbs and distributes the mechanical stress from the fasteners, preventing it from concentrating on the cover sheet and causing deformation, while still maintaining the fixed position of the display stack.
2Stability of the object's composition
If very-high-bond (VHB) tape is used to bond the cover sheet to the display assembly, then the display stack is secured, but the thickness of the VHB tape causes the cover sheet to deform
Solution Approach 1:
The patent replaces the continuous VHB tape bonding with discrete fastener pucks positioned at specific locations around the perimeter. This segmentation eliminates the need for thick continuous adhesive layers that cause deformation, while still providing secure bonding through multiple distributed attachment points.
Solution Approach 2:
The patent changes the bonding parameter from using a thick continuous adhesive layer (VHB tape) to using thin discrete fastener elements with minimal adhesive. This parameter change reduces the overall thickness and eliminates the deformation caused by thick adhesive layers while maintaining bonding strength.
3Stability of the object's composition
If the carriage assembly is directly attached to the cover sheet, then the display stack is held in position, but mechanical stress is transmitted to the image-emitting layer causing visual defects
Solution Approach 1:
The patent introduces fastener pucks with compliant adhesive layers as intermediaries between the carriage assembly and the cover sheet. These intermediaries decouple the mechanical stress from the image-emitting layer, allowing the carriage assembly to hold the display stack in position without transmitting harmful mechanical stress to the sensitive display components.
Solution Approach 2:
The patent segments the attachment system into discrete fastener pucks rather than direct continuous attachment. This segmentation creates isolated stress points that do not transmit mechanical stress across the entire image-emitting layer, preventing visual defects while maintaining positional stability.
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
The solution effectively reduces visual defects by decoupling the image-emitting layer from mechanical stress, maintaining a flat and aesthetically clean exterior surface while allowing for multi-touch capabilities and scalability, thereby enhancing the display's reliability and user interaction.
Implementation Method 1
A plurality of fastener pucks may be positioned adjacent a perimeter of the interior surface of the cover sheet and may secure the carriage assembly to the interior surface of the cover sheet via a curable adhesive
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Various embodiments relating to a large-format touch display having a continuous touch surface that is flat and free from visual defects are disclosed. In one embodiment, a display assembly includes a display stacking including a cover sheet having an exterior surface and an interior surface opposing the exterior surface and an image-emitting layer secured to the interior surface,, a carriage assembly configured to hold the display stack in a fixed position in the display assembly, and a plurality of fastener pucks positioned adjacent a perimeter of the interior surface of the cover sheet and securing the carriage assembly to the interior surface of the cover sheet via a curable adhesive.