Switchable Light Filter With Liquid Crystal Viewing-Angle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies for switchable visual protection in displays suffer from complexity, light loss, and inefficiency in switching between wide and narrow viewing angles, particularly in mobile devices and vehicle screens, often requiring mechanical attachment and causing brightness reduction.
Innovation Solution
A light filter system using a first optical element with aligned light-absorbing transition dipole moments and a liquid crystal layer, controlled by electric fields, to switch between modes based on light direction and polarization, allowing selective transmission or absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If mechanical microlouver films are used for visual protection, then viewing angle control is achieved, but light loss increases and switching complexity increases
Solution Approach 1:
The patent replaces mechanical microlouver films with a liquid crystal-based optical system. The liquid crystal layer, when subjected to an electric field, changes its molecular orientation to control light transmission angles without mechanical movement. This substitution eliminates the need for physical attachment and removal of films, reducing light loss while maintaining viewing angle control functionality.
Solution Approach 2:
The patent utilizes changes in liquid crystal molecular orientation parameters in response to electric field application. By adjusting the molecular alignment through electrical control, the system dynamically modifies light transmission properties including viewing angle and polarization state, achieving visual protection without mechanical intervention or significant light loss.
2Object-affected harmful factors
If mechanical microlouver films are used for visual protection, then viewing angle control is achieved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical microlouver films with a liquid crystal-based optical system. The liquid crystal layer, when subjected to an electric field, changes its molecular orientation to control light transmission angles without mechanical movement. This substitution eliminates the need for physical attachment and removal of films, reducing light loss while maintaining viewing angle control functionality.
Solution Approach 2:
The liquid crystal system is integrated directly into the display structure, utilizing the display's own backlight and control electronics to achieve viewing angle management. The system serves itself by using existing components (backlight, electrodes) to control light transmission, eliminating the need for separate mechanical film handling systems.
3Object-affected harmful factors
If complex light guides with multiple optical elements are used, then viewing angle control is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the viewing angle control function with the existing liquid crystal display structure. The liquid crystal layer serves dual purposes: displaying image information and controlling viewing angles through its optical properties. This integration eliminates the need for separate complex light guide structures with multiple optical elements, simplifying manufacturing while achieving the same functional outcome.
4Object-affected harmful factors
If scattering particles are used in the light guide, then viewing angle control is achieved, but light transmission efficiency decreases
Solution Approach 1:
The patent replaces scattering particles with a liquid crystal-based optical system. The liquid crystal layer, when subjected to an electric field, changes its molecular orientation to control light transmission angles without mechanical movement. This substitution eliminates the need for physical attachment and removal of films, reducing light loss while maintaining viewing angle control functionality.
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 efficient switching between wide and narrow viewing angles with minimal light loss and complexity, maintaining brightness and resolution, suitable for mobile devices and vehicle screens.
Implementation Method 1
a liquid crystal layer, which is arranged behind or in front of the first optical element in the viewing direction and onto which the first electric field EF1 or the second electric field EF2 acts and which, as a function thereof, influences the polarization state of light passing through it
Implementation Method 2
a first optical element, in turn comprising a plurality of light-absorbing transition dipole moments, which are arranged in a layer with a thickness of at least 0.2 micrometers
Implementation Method 3
the absorbing transition dipole moments are preferably formed by dichroitic dyes
Data Source
AI summary
The invention relates to a switchable light filter (5), comprising a first optical element (1), in turn comprising a plurality of light-absorbing transition dipole moments, so that light, which is incident into the first optical element (1), is transmitted or at least partially absorbed as a function of its direction of incidence with respect to the first optical element (1) and its polarization state, means for optionally generating a first electric field (EF1) or a second electric field (EF2), a liquid crystal layer (3), onto which the first electric field (EF1) or the second electric field (EF2) acts, so that the transmission properties of the switchable light filter (5) differ between a first operating mode B1. The invention further discloses lighting devices and screen, which use an afore-described switchable light filter (5).