Optical Film Side Wall Coating for Automotive Display Reflections
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Solution Overview
Problem
Traditional optical films used for privacy and light collimation in automotive displays suffer from significant on-axis light absorption due to their geometry, leading to reduced light transmission and undesired reflections.
Innovation Solution
The development of an optical film manufacturing method involving a base film with micro-replicated structures, where a catalyst layer is selectively deposited and retained on side surfaces, followed by electroless metal growth to form a metallic layer, which is then darkened to reduce reflections and enhance light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional optical films with light-absorbing channels are used for privacy and light collimation, then viewing angle control and reflection reduction are improved, but on-axis light transmission is significantly reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different surface regions: the top surfaces of channels remain open for light transmission, while only the side surfaces receive reflective coatings. This selective coating approach ensures that privacy and reflection control are achieved only where geometrically necessary, preserving on-axis light transmission through the channel openings.
Solution Approach 2:
The reflective coating is segmented to be applied only on specific surfaces (side walls of channels) rather than uniformly across all channel surfaces. This segmentation allows light to pass through channel openings while reflecting off side walls, resolving the contradiction between privacy control and light transmission.
2Object-affected harmful factors
If traditional optical films with light-absorbing channels are used for privacy and light collimation, then viewing angle control is improved, but overall light transmission is reduced
Solution Approach 1:
The reflective coating is selectively applied only to side surfaces of channel structures, leaving top and bottom surfaces untreated. This local application ensures that light transmission paths remain open while reflection control is achieved only where needed for viewing angle management.
Solution Approach 2:
Instead of using light-absorbing materials that permanently remove light energy, the patent uses reflective coatings that redirect light. This converts the harmful effect of uncontrolled reflection into a beneficial viewing angle control mechanism while preserving light transmission through the film.
3Object-affected harmful factors
If carbon black-filled micro-replicated channels are used, then privacy control is achieved, but on-axis light transmission loss increases
Solution Approach 1:
The patent replaces uniform light-absorbing material filling with localized reflective coatings applied only on channel side walls. This local treatment maintains privacy control through reflection while eliminating the pervasive light absorption that occurred with carbon black filling throughout the entire channel volume.
Solution Approach 2:
The invention changes the mechanism from light absorption (carbon black) to light reflection (metallic coatings). This parameter change in the optical interaction mechanism transforms the film from an attenuating element to a redirecting element, improving transmission while maintaining privacy control.
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 method results in an optical film with improved light transmission and reduced reflections, maintaining privacy while allowing for high transmission capabilities suitable for various applications, including automotive displays.
Implementation Method 1
The metallic layer is generated by electroless metal growth due to a reaction between the catalyst layer and one or more reagents
Implementation Method 2
Optical films can be placed proximate to a display surface, image surface, or other surface to be viewed. Typically, images being displayed can be viewed through the optical film only when a viewer is positioned within a range of angles
Implementation Method 3
back reflection off of a windshield of the automobiles is undesired. The use of optical films in car displays is a way to collimate output from the display to avoid light travelling upwards and backwards to the windshield
Data Source
AI summary
A method of manufacturing an optical film includes providing a base film. The base film includes a substrate defining a first surface and a second surface. The base film also includes a plurality of structures defining an upper surface and at least one side surface extending from the corresponding upper surface to a base portion. The method also includes depositing a catalyst material on each of the plurality of structures and the base portion to form a catalyst layer thereon. The method further includes selectively removing the catalyst layer from the upper surface of each of the plurality of structures and the base portion while retaining an activity of the catalyst layer on the at least one side surface of each of the plurality of structures. The method includes forming a metallic layer on the at least one side surface of each of the plurality of structures.