Optical Film Structure With Prism Layer for Switchable Viewing Angles
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Solution Overview
Problem
Existing display technologies lack the ability to adjust viewing angles after the optical film assembly is equipped, limiting flexibility in viewing experience.
Innovation Solution
An optical film structure with a base layer and a viewing angle adjustment layer that can switch between narrow and wide viewing angles by adjusting the configuration of the viewing angle adjustment layer, utilizing prisms and transparent medium to alter the emission angle of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical film assembly is equipped to enhance light extraction efficiency, then light extraction efficiency is improved, but the ability to adjust viewing angles is lost
Solution Approach 1:
The optical film assembly incorporates a movable viewing angle adjustment layer that can dynamically change its position or orientation relative to the base layer. This layer includes transparent prisms with specific apex angles that, when repositioned, alter the light emission angle. The dynamic reconfiguration allows the system to maintain high light extraction efficiency while providing adjustable viewing angles, directly resolving the contradiction between fixed optical performance and adaptability.
Solution Approach 2:
The invention changes the emission angle parameter by adjusting the configuration of the viewing angle adjustment layer. By modifying the position, orientation, or apex angle of the transparent prisms within this layer, the system can vary the viewing angle from narrow to wide while maintaining effective light extraction. This parameter adjustment capability resolves the contradiction by making the viewing angle a variable rather than a fixed property.
2Adaptability or versatility
If the viewing angle adjustment layer uses prisms with larger apex angles to widen viewing angles, then viewing angle is improved, but light extraction efficiency may be reduced
Solution Approach 1:
The optical film assembly employs different prism configurations in different regions or at different operational states. The viewing angle adjustment layer contains transparent prisms with varying apex angles that can be selectively activated or positioned. When wide viewing angles are needed, prisms with larger apex angles are engaged; when high light extraction efficiency is prioritized, prisms with smaller apex angles are used. This local differentiation resolves the contradiction by allowing optimal prism selection for each operational requirement.
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
Enables dynamic adjustment of viewing angles, enhancing user experience by providing both narrow and wide viewing modes based on the configuration of the viewing angle adjustment layer.
Implementation Method 1
the viewing angle adjustment layer includes a plurality of first prisms; each of the first prisms includes a first sidewall portion extending along a first direction and a second sidewall portion extending along a second direction... the first prism includes a first apex angle included by the first sidewall portion and the second sidewall portion
Data Source
AI summary
An optical film structure, a backlight module, and a display device are provided. The optical film structure includes a base layer and a viewing angle adjustment layer positioned on a light-emitting side of the base layer. The optical film structure features a narrow viewing angle mode and a wide viewing angle mode. In the narrow viewing angle mode, the viewing angle adjustment layer is configured to narrow the light's emission angle to a first emission angle. In the wide viewing angle mode, the viewing angle adjustment layer is configured to adjust the light's emission angle to a second emission angle, which is greater than the first emission angle. The optical film structure achieves the switching between narrow and wide viewing angle modes by adjusting the configuration of the viewing angle adjustment layer.