Privacy Screen Frustum Array for Glare Reduction and Viewing Angle Control
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Solution Overview
Problem
Existing screens for electronic devices and windows face challenges in reducing glare for the primary viewer while maintaining privacy, as current solutions either fail to provide adequate privacy or compromise screen brightness and clarity.
Innovation Solution
A privacy screen featuring an array of frustums on a substrate, where the index of refraction of the substrate matches that of the frustums, with the spaces between them having a lower index of refraction, controls incoming light in specific directions, minimizing glare for the primary viewer and increasing it for others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dark-colored tempered glass or plastic films are used to reduce glare, then glare reduction is achieved, but privacy protection is minimal and screen brightness and clarity are adversely affected
Solution Approach 1:
The patent applies local quality by creating regions of different optical properties at specific locations. The frustum structures are positioned only on the rear surface of the display, with their reflective surfaces oriented at specific angles to redirect light locally. This allows glare reduction in specific viewing directions while maintaining screen brightness and clarity for the intended viewer.
Solution Approach 2:
The patent transitions from two-dimensional flat filters to three-dimensional frustum structures. The frustums have depth and angled surfaces that manipulate light in multiple dimensions, enabling selective glare redirection toward specific angles while preserving forward viewing quality. This dimensional addition allows simultaneous achievement of glare reduction and screen clarity.
2Illumination intensity
If screen brightness is increased to compensate for dimmer screen with screen protectors, then screen visibility is maintained, but battery drains quickly
Solution Approach 1:
The patent converts the harmful effect of ambient light reflecting off the screen into a beneficial effect. The frustum structures are designed to reflect ambient light away from the viewer's line of sight, turning what would be distracting glare into a privacy-enhancing feature. This passive optical manipulation requires no additional energy input while improving screen visibility in bright environments.
3Loss of information
If micro-louver screen protectors are used to provide privacy, then privacy protection is achieved, but light transmittance decreases, screen clarity is reduced, color contrast is diminished, and glare from light behind the user increases
Solution Approach 1:
The patent inverts the conventional approach to privacy protection. Instead of using opaque or light-blocking materials that reduce overall light transmission, the frustum structures use reflective surfaces to redirect ambient light away from unauthorized viewers. This inverted approach maintains high light transmittance and screen clarity for the intended viewer while providing privacy through controlled light reflection.
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 reduces environmental glare for the primary viewer while enhancing privacy by directing scattered light outside the primary viewing angle, improving screen clarity and reducing eye strain.
Implementation Method 1
the index of refraction of the substrate is comparable to the index of refraction of the frustum, wherein the index of refraction of the spaces between the frustums is lower than the index of refraction of the frustums, and wherein incoming light is controlled in at least one direction
Implementation Method 2
controls incoming light in at least one direction... minimizing glare for the primary viewer and increasing it for others
Data Source
AI summary
An array of microstructures or frustums on a substrate for reducing glare for electronic device displays or windows. The microstructures are designed to nearly perfectly align with the pixels on the display to avoid adverse viewing effects, such as Moiré effects. Substantially all light from the environment illuminating the front side of the film containing the microstructures from all angles is not reflected to the primary viewer (often viewing at an angle normal to the film). Light illuminating the microstructure from the environment will reflect off the microstructures at angles greater than a defined threshold outside the primary viewers field of view. Thus, glare to the primary viewer is minimized while glare to other views who view from other angles than the primary viewer is increased. This increased glare for other viewers adds privacy for the viewing by the primary viewer.