Colored Adhesive Sheet for Display Heat Dissipation and Visibility
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Solution Overview
Problem
Pressure sensitive adhesive sheets used in liquid crystal display devices face challenges in ensuring image visibility and heat dissipation due to their light-blocking properties and heat generation from light emitters like LEDs, which can lead to thermal deterioration.
Innovation Solution
A pressure sensitive adhesive sheet with a colored layer having a lightness of 90 or less, total luminous transmittance of 3% or more, and thermal conductivity of 0.1 W/m·K or more, allowing for improved design aesthetics and heat dissipation while maintaining image visibility, is developed. This sheet can be laminated with a colorless adhesive layer to enhance bonding and heat dissipation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a colored pressure sensitive adhesive sheet is used to improve design properties and achieve unity with peripheral portions, then the aesthetic appearance is improved, but the visibility of displayed images deteriorates due to light blocking
Solution Approach 1:
The patent applies parameter changes by precisely controlling the lightness L* of the colored pressure sensitive adhesive layer to be 90 or less, and the total luminous transmittance to be 3% or more. This quantitative parameter control allows the adhesive to provide sufficient coloring for aesthetic unity while maintaining adequate light transmission for image visibility, thus resolving the contradiction between appearance and visibility.
2Illumination intensity
If light emitters are arranged directly below the display unit to increase light amount and uniformity, then the brightness and contrast are improved, but heat generation causes thermal deterioration of adjacent members
Solution Approach 1:
The patent converts the harmful heat generated by light emitters into a beneficial effect by using the colored pressure sensitive adhesive layer as a heat dissipation path. The layer conducts heat away from the light emitters and distributes it across the display body structure, transforming the harmful thermal energy into a controlled heat management solution that prevents localized overheating.
Solution Approach 2:
The colored pressure sensitive adhesive layer serves as an intermediary between the light emitters and the display body structure. It acts as a thermal interface that mediates heat transfer, distributing thermal energy from the concentrated light emitter sources across a broader area of the display body, thus preventing direct thermal damage to sensitive components.
3Illumination intensity
If the lightness of the colored pressure sensitive adhesive layer is increased to improve image visibility, then the transmittance is improved, but the design properties and unity with peripheral portions deteriorate
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal parameter range for lightness L* (90 or less) that balances both visibility and aesthetics. This parameter optimization ensures that the adhesive provides sufficient coloration for design unity while maintaining adequate light transmission for image visibility, preventing either extreme from dominating.
4Temperature
If the thermal conductivity of the pressure sensitive adhesive layer is increased to improve heat dissipation, then the thermal management is improved, but the bonding properties may deteriorate
Solution Approach 1:
The patent applies parameter changes by setting the thermal conductivity to 0.1 W/m·K or more while simultaneously optimizing the lightness parameter (L* ≤ 90). This coordinated parameter optimization ensures that the adhesive layer achieves sufficient thermal conductivity for heat dissipation while maintaining the coloration needed for design properties, preventing either parameter from compromising the other or the bonding performance.
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 provides excellent heat dissipation and improved design aesthetics for display bodies, ensuring image visibility and preventing thermal deterioration of adjacent components, while maintaining a harmonious appearance with black or white peripheral portions.
Implementation Method 1
the pressure sensitive adhesive layer having a thermal conductivity of 0.1 W/m·K or more
Data Source
AI summary
A pressure sensitive adhesive sheet having a pressure sensitive adhesive layer that includes at least one colored pressure sensitive adhesive layer, the colored pressure sensitive adhesive layer having a pressure sensitive adhesive that contains a colorant, the pressure sensitive adhesive layer having a lightness L* of 90 or less as defined by a CIE 1976 L*a*b* color system, the pressure sensitive adhesive layer having a total luminous transmittance of 3% or more and a thermal conductivity of 0.1 W/m·K or more.