Solid UV Adhesive for Sealed Touch LCD Screen
Solution Overview
Problem
Current touch screen manufacturing methods face challenges with expensive equipment, uneven adhesive distribution leading to bubbles and mura effects, and increased production costs due to incomplete bubble elimination and adhesive overflow, especially in larger screens.
Innovation Solution
A method using solid UV flexible adhesives and an autoclave for bubble elimination, ensuring even pressure distribution and uniform thickness, combined with high power UV light solidification to form a fully sealed and anti-interference touch LCD screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid UV optical adhesive is applied and pressed with a roller to eliminate bubbles, then adherence between glass pieces is achieved, but the adhesive is distributed with varied thicknesses leaving unwanted bubbles inside
Solution Approach 1:
The patent changes the physical state of the adhesive from liquid to solid form. Solid adhesive maintains uniform thickness during application and pressing, eliminating the bubble formation issue caused by liquid adhesive flowing under roller pressure while still achieving proper adhesion when UV cured
Solution Approach 2:
The patent replaces the mechanical roller pressing system with a UV light curing system. Instead of using mechanical force to spread and press liquid adhesive, the solid adhesive is positioned and then cured in place with UV light, eliminating the need for roller pressing and the associated thickness variation problems
2Reliability
If liquid UV optical adhesive is pressed with a roller to eliminate bubbles, then adherence is achieved, but adhesive overflows to the gaps at the edge-lighting backlight module increasing defective rate
Solution Approach 1:
Changing the adhesive from liquid to solid state eliminates overflow issues. Solid adhesive maintains its shape and does not flow under pressure, preventing contamination of the edge-lighting backlight module gaps while still providing adequate adhesion when cured
Solution Approach 2:
The patent uses a precut solid adhesive sheet that is disposed of after single use. This eliminates the need for expensive adhesive application equipment and prevents overflow issues entirely, as the adhesive is already in its final position and form before application
3Reliability
If centrifugal force is used to eliminate bubbles in large display screens, then bubbles are removed, but the process takes longer and is harder to achieve due to the larger distance
Solution Approach 1:
The patent replaces the centrifugal force mechanical system with UV light curing. Instead of using centrifugal force to move bubbles over long distances in large screens, the solid adhesive is pressed with uniform force and then cured in place with UV light, achieving bubble elimination without the time and distance constraints of centrifugal methods
Solution Approach 2:
The patent introduces a new dimension of UV light curing from above the adhesive layer. This allows simultaneous bubble elimination and adhesion across the entire screen surface at once, rather than relying on centrifugal force that must work its way through the adhesive layer over time and distance
4Reliability
If pressure and temperature are increased during adhesion of large display screens, then bubbles are eliminated, but pressure and temperature distribution becomes significantly different across the screen surface causing mura patterns
Solution Approach 1:
The patent replaces the thermal and pressure gradient system with a UV light curing system. Instead of heating and pressurizing the adhesive which creates non-uniform distribution across large screens, the solid adhesive is pressed uniformly and then cured with UV light, eliminating the mura pattern problem caused by temperature and pressure variations
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 approach reduces manufacturing costs, increases product yield, and eliminates bubbles and mura effects, resulting in a thinner, brighter, and more reliable touch screen with improved image clarity and energy efficiency.
Implementation Method 1
with pressure and temperature inside the autoclave maintained at 0.5-10kg and 30-65°C respectively
Implementation Method 2
with pressure and temperature inside the autoclave maintained at 0.5-10kg and 30-65°C respectively
Implementation Method 3
illuminating the components attached by the solid UV flexible adhesives using a high power UV light to solidify the solid UV flexible adhesives
Data Source
Figure 1
Figure 2~3
AI summary
A manufacturing process for an integrated fully-sealed liquid crystal screen is disclosed. Components sequentially arranged are adhered to each other into a whole by a solid ultraviolet flexible adhesive, the components comprising a screen protecting glass, a liquid crystal screen set, a support frame and a rear glass cover plate and an edge lighting type backlight module being nested in the support frame. The touch and display integrated screen manufactured by the process is fully-sealed, waterproof, damp-proof and ultrathin, all gaps of the screen protecting glass or the touch screen set, a liquid crystal display screen set and the side lighting type backlight module are eliminated, the image definition is improved, and also the brightness can be reduced to achieve a remarkable energy-saving effect.