Optical Film with Structured Layer for Luminance and Damage Reduction
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Solution Overview
Problem
Conventional reflective polarizers in display systems, when combined with brightness enhancement films, often produce higher on-axis luminance but can damage other components due to sharp edges, and require multiple film stacks for similar performance with collimating reflective polarizers.
Innovation Solution
A single optical film with a collimating reflective polarizer and a structured layer featuring three-dimensional structures on its surface, where the structures have a surface normal angle between 35 to 55 degrees over at least 50% of the surface area, is used to enhance axial luminance and reduce damage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional reflective polarizers are combined with brightness enhancement films, then on-axis luminance is improved, but device complexity increases and components may be damaged due to sharp edges
Solution Approach 1:
The patent combines the collimating reflective polarizer and structured layer into a single integrated optical film, eliminating the need for multiple separate film stacks. This merging approach maintains the high on-axis luminance performance while reducing device complexity and the number of components required
Solution Approach 2:
The structured layer introduces three-dimensional structures with specific surface normal angles (35-55 degrees) on the optical film surface. This dimensional change from flat to structured surface enables the film to achieve both collimation and brightness enhancement functions in a single component, resolving the contradiction between performance and complexity
2Illumination intensity
If conventional brightness enhancement films with sharp edges are used, then on-axis luminance is improved, but harmful factors increase due to potential damage to other components
Solution Approach 1:
The structured layer features three-dimensional structures with curved or angled surfaces (surface normal angles of 35-55 degrees) instead of sharp edges. This curvature eliminates the harmful sharp edges that could damage other components while maintaining the optical performance for enhancing on-axis luminance
Solution Approach 2:
The patent changes the surface geometry parameters of the optical film by introducing structured layers with specific surface normal angles (35-55 degrees). This parameter change enables the film to provide brightness enhancement without the harmful sharp edges present in conventional films
3Illumination intensity
If multiple film stacks are used to achieve collimating reflective polarizer performance, then axial luminance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the collimating reflective polarizer and structured layer into a single optical film that can be manufactured as one integrated component. This eliminates the need for multiple separate film stacks and reduces manufacturing complexity while maintaining high axial luminance performance
Solution Approach 2:
The single optical film performs multiple functions simultaneously: it acts as a collimating reflective polarizer while also providing brightness enhancement through its structured layer. This multi-functionality eliminates the need for separate films and simplifies the manufacturing process
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 configuration achieves axial luminance comparable to or better than conventional three-film stacks, while minimizing damage to other components by using a single optical film with a structured layer that can be formed directly on the collimating reflective polarizer.
Implementation Method 1
a structured layer disposed on a major surface of the collimating reflective polarizer... the three-dimensional structures having a surface normal having an angle relative to a plane of the optical film that is in a range of about 35 degrees to about 55 degrees
Implementation Method 2
Reflective polarizers substantially transmit light having one polarization state while substantially reflecting light having an orthogonal polarization state
Implementation Method 3
Reflective polarizers substantially transmit light having one polarization state while substantially reflecting light having an orthogonal polarization state
Data Source
AI summary
An optical film including a collimating reflective polarizer and a structured layer disposed on a major surface of the collimating reflective polarizer. The structured layer includes a plurality of three-dimensional structures on an outer major surface of the structured layer facing away from the collimating reflective polarizer. The three-dimensional structures have a surface normal having an angle relative to a plane of the optical film that is in a range of about 35 degrees to about 55 degrees over at least 50 percent of a surface area of the three-dimensional structures.