Display Assembly Seal for Stress-Free Optical Bonding
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Solution Overview
Problem
Existing display device assembly methods apply significant stresses to screens during attachment, leading to image defects like the Mura effect and potential delamination of optical bonding between the screen and lens, while also being irreversible.
Innovation Solution
A method involving a seal that maintains a sealed connection between the screen and lens, forming a spacer with an injection opening for transparent adhesive, which absorbs stresses and ensures reliable, reversible immobilization without mechanical force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screen is firmly attached to the frame using screws, then the screen is immobilized reliably on the frame, but significant stresses are applied to the screen causing display defects like Mura effect
Solution Approach 1:
A seal is introduced as an intermediary element between the screen and the frame. The seal absorbs the mechanical stresses that would otherwise be transmitted directly to the screen, while still maintaining the immobilization function. This mediator protects the screen from stress-induced display defects while ensuring reliable attachment.
Solution Approach 2:
The seal acts as a flexible element that can deform to absorb stresses without transmitting them to the rigid screen. This flexible component maintains the connection between screen and frame while protecting the display surface from stress-related defects.
2Object-affected harmful factors
If adhesive elements are used to attach the screen to the frame, then stresses on the screen are reduced, but the assembly becomes irreversible
Solution Approach 1:
The attachment system is segmented into distinct functional components: the seal provides flexible stress-absorbing attachment, while separate injection openings enable controlled adhesive application. This segmentation allows the assembly to be reversible and reconfigurable, as components can be detached and repositioned without permanent bonding during the assembly process.
3Stability of the object's composition
If the screen is immobilized firmly during polymerization, then the screen remains stable relative to the lens, but stresses cause delamination of optical bonding
Solution Approach 1:
The seal serves as a mediator that decouples the mechanical constraint function from the optical bonding function. It maintains position stability during polymerization while protecting the optical bonding interface from stress-induced delamination.
4Strength
If mechanical attachment methods are used, then the screen is securely fixed to the frame, but the assembly process applies harmful forces to the display surface
Solution Approach 1:
The patent replaces direct mechanical attachment (screws) with a hybrid system combining a flexible seal and chemical adhesive bonding. This substitution eliminates the need for mechanical fasteners that directly contact and stress the display surface, while maintaining secure attachment through the seal-adhesive combination.
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 method prevents image defects by maintaining a constant space between the screen and lens, reducing stress on the screen and minimizing delamination risks, while allowing for reversible assembly without applying harmful forces.
Implementation Method 1
The optical adhesive is for example activated and/or polymerized by heat, ultraviolet radiation or after a certain period of time.
Implementation Method 2
these stresses are absorbed by the seal
Data Source
AI summary
A method for assembling a display device that includes the following successive steps: assembling a screen having a display face with a seal, thereby forming a central assembly; attaching a frame with a lens, thereby forming a front assembly; assembling the central assembly with the front assembly, the seal maintaining a sealed connection between the lens and the screen and forming a spacer maintaining a space between the screen and the lens. The seal includes at least one injection opening having an internal orifice opening into the space and an external orifice adapted to receive an injector tip of a transparent adhesive. The method includes injecting the transparent adhesive into the space via the injection opening.