Optical Laminate Reddening-Resistant Layer Thermal Management
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Solution Overview
Problem
Optical laminates, particularly polarizing layers, face reddening issues under high temperature conditions, leading to degradation and loss of optical performance, especially when in contact with thermally conductive substrates like soda lime glass.
Innovation Solution
Incorporating a reddening-resistant layer, such as a void-containing porous layer, adjacent to the optical functional layer to block heat transfer and prevent reddening, which is achieved by controlling the thickness, thermal diffusivity, and positioning of the reddening-resistant layer to minimize heat transfer and maintain optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the optical laminate is placed in contact with a thermally conductive substrate like cover glass, then heat transfer to the optical laminate is improved, but reddening of the optical functional layer occurs under high temperature conditions
Solution Approach 1:
A reddening-resistant layer is introduced as an intermediary between the optical functional layer and the thermally conductive substrate. This layer has thermal diffusivity controlled within 0.05-0.50 mm²/s, which is lower than conventional layers, allowing it to block heat transfer to the optical functional layer while maintaining optical transparency and durability under harsh conditions.
Solution Approach 2:
The thermal diffusivity parameter of the reddening-resistant layer is specifically controlled within the range of 0.05-0.50 mm²/s. By changing this thermal parameter, the layer effectively reduces heat transfer to the optical functional layer, preventing reddening while maintaining other optical properties.
2Reliability
If a reddening-resistant layer is added to block heat transfer, then reddening is prevented, but the device structure becomes more complex
Solution Approach 1:
The reddening-resistant layer is designed to perform multiple functions simultaneously: it blocks heat transfer to prevent reddening, maintains optical transparency for display performance, and provides durability under harsh conditions. By consolidating these functions into a single layer with controlled thermal diffusivity, the need for multiple separate functional layers is reduced, thereby limiting the increase in structural complexity.
3Reliability
If the thickness of the reddening-resistant layer is increased to improve heat blocking, then reddening resistance is improved, but optical transparency may be compromised
Solution Approach 1:
The thermal diffusivity of the reddening-resistant layer is precisely controlled within 0.05-0.50 mm²/s. By optimizing this thermal parameter, the layer achieves effective heat blocking at practical thicknesses while maintaining sufficient optical transparency for display applications, resolving the trade-off between heat protection and light transmission.
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 reddening-resistant layer effectively delays reddening of optical laminates under harsh conditions, ensuring minimal change in a* values and transmittance, even when exposed to high temperatures, thus maintaining optical performance and durability.
Implementation Method 1
Incorporating a reddening-resistant layer, such as a void-containing porous layer, adjacent to the optical functional layer to block heat transfer and prevent reddening
Implementation Method 2
The reddening-resistant layer may have a thermal diffusivity within a certain range, thereby delaying reddening of an optical laminate
Data Source
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AI summary
The present application relates to an optical laminate or a reddening-resistant layer. The present application can provide an optical laminate that does not cause a so-called reddening phenomenon even when driven or maintained under extremely harsh conditions (e.g., very high temperature conditions), or a reddening-resistant layer applied thereto.