Optical Film UV-Absorbing Layer Suppresses Fluorescence
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Solution Overview
Problem
High-resolution image display devices with plastic films containing UV-absorbing agents can appear pale at the edges, even without UV degradation, due to fluorescence emission from the resin and UV-absorbing agents.
Innovation Solution
A UV-absorbing layer containing a UV-absorbing agent B is formed on a plastic film with a UV-absorbing agent A, optimizing the placement of the UV-absorbing layer to suppress fluorescence emission when sunlight enters from that side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic film containing a UV-absorbing agent is used to protect the polarizer, then light resistance is improved, but fluorescence emission occurs causing pale edges on the screen
Solution Approach 1:
The invention divides the UV-absorbing function into two separate components: UV-absorbing agent A incorporated in the plastic film base material and UV-absorbing agent B incorporated in a coating layer on the plastic film. This segmentation allows each agent to work synergistically, with agent B suppressing the fluorescence emission from agent A and the resin, while agent A provides the primary UV protection. The coating layer containing agent B is applied in an amount of 0.1 to 10 parts by mass per 100 parts by mass of the plastic film, creating a composite structure that resolves the contradiction between UV protection and fluorescence suppression.
2Area of stationary object
If the screen size is increased for high-resolution image display devices, then display quality is improved, but fluorescence emission at edge regions is enhanced causing pale appearance
Solution Approach 1:
The invention applies a coating layer containing UV-absorbing agent B specifically on the plastic film surface, creating a localized region with enhanced UV-absorbing properties. This coating layer is strategically positioned to address the fluorescence emission issue at the edge regions of large screens. The coating contains UV-absorbing agent B at a concentration that specifically targets and suppresses fluorescence emission without compromising the overall UV protection or display quality of the large-screen device.
3Strength
If a thick plastic film is used to enhance durability, then protection performance is improved, but fluorescence emission is enhanced causing pale edges
Solution Approach 1:
The invention creates a composite material structure consisting of the plastic film base material containing UV-absorbing agent A and a coating layer containing UV-absorbing agent B. This composite structure allows the thick plastic film to maintain its durability and protection performance while the coating layer suppresses the fluorescence emission that would otherwise be enhanced by the increased film thickness. The synergistic interaction between the two UV-absorbing agents in the composite structure resolves the contradiction between protection performance and fluorescence emission.
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 suppresses the appearance of pale edges in image display devices, enhancing the visual quality by reducing fluorescence emission, especially in high-resolution and large-screen devices.
Implementation Method 1
a plastic film containing a UV-absorbing agent kneaded therein to reduce temporal degradation due to ultraviolet rays
Implementation Method 2
at least either one of a resin component constituting a plastic film and a UV-absorbing agent contained in a plastic film absorbs light in an ultraviolet wavelength region and emits fluorescence in a visible short wavelength region
Data Source
AI summary
Provided is an optical film that, when being incorporated into an image display device, can suppress the image display device from appearing pale. An optical film including a UV-absorbing layer containing a UV-absorbing agent B on a plastic film containing a UV-absorbing agent A, wherein fluorescence emission when the plastic film side is irradiated with excitation light having a wavelength of 365 nm and fluorescence emission when the UV-absorbing layer side is irradiated with excitation light having a wavelength of 365 nm satisfy a specific condition.