PDLC Lighting Control via Electric Field
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Solution Overview
Problem
Existing lighting systems for interior and exterior spaces are costly due to mechanical components that are susceptible to wear, and they lack adaptability to external conditions or signals for dynamic lighting control.
Innovation Solution
A system comprising multiple lights with a polymer dispersed liquid crystal (PDLC) layer and a control unit connected to an external signal generator, allowing for adaptive lighting control through electrical influence of the PDLC layer, enabling dynamic adjustment of light intensity, color, and direction based on external signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical devices such as movable screens or slats are used to adjust lighting direction and scattering, then lighting control is achieved, but manufacturing cost increases and mechanical elements become susceptible to wear and force effects
Solution Approach 1:
The patent replaces mechanical devices (movable screens, slats) with an electro-optical system using a PDLC film and electric field generation means. The lighting control is achieved by applying electrical fields to change the optical properties of the PDLC film, eliminating mechanical moving parts and their associated wear and reliability issues.
Solution Approach 2:
The patent changes the optical parameters of the lighting system by applying electrical fields to the PDLC film. By varying the electrical field strength and polarity, the film transitions between transparent and opaque states, and can control light scattering direction, providing lighting control through electrical parameter changes rather than mechanical movement.
2Ease of operation
If mechanical devices such as movable screens or slats are used to adjust lighting, then lighting direction control is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive mechanical devices with an electro-optical system using PDLC film and electric field generation means. This substitution eliminates the need for complex mechanical assemblies, reducing manufacturing costs while maintaining lighting direction control capability through electrical actuation.
Solution Approach 2:
The patent uses electrical field parameters to control lighting direction and scattering. By changing the electrical field configuration rather than mechanical positions, the system achieves lighting control with simpler, less expensive components that are easier to manufacture and install.
3Adaptability or versatility
If a lighting system is made adaptable to external conditions and signals, then lighting flexibility improves, but system complexity increases
Solution Approach 1:
The patent creates a universal lighting control system where the PDLC film and electric field generation means can respond to multiple types of external signals (light sensors, motion detectors, control units). The same basic mechanism handles various lighting scenarios, providing adaptability without proportionally increasing complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms where sensors detect external conditions (light levels, motion) and automatically adjust the electrical fields applied to the PDLC film. This automatic feedback control provides adaptability to external conditions while keeping the control logic centralized, managing system complexity through intelligent control rather than complex hardware.
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 system provides cost-effective, adaptable, and responsive lighting that can be controlled by external signals, such as those from moving objects or machines, enhancing lighting efficiency and flexibility in various environments.
Implementation Method 1
By applying an electric field, the liquid-crystalline molecules are reoriented and the refractive indices adjusted so that the films are no longer scattering but transparent
Implementation Method 2
The optical element consists of an electro-optical material or at least contains such a material, so that the state of the optical element can be changed by an electrical field that can be applied thereto
Implementation Method 3
The PDLC films are milky white and opaque in the absence of an applied electric field because incident light is scattered due to the different refractive indices of the droplets and the polymer matrix
Implementation Method 4
incident light is scattered due to the different refractive indices of the droplets and the polymer matrix
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
In a system (1) for interior lighting of a building (7), in particular a room, or exterior lighting of a square (8), several luminaires (2) are provided which can be arranged on a stationary object (7), wherein at least one luminaire (2) comprises a light source (3) with a downstream PDLC layer and the luminaires (2) are connected to a control unit which includes interfaces for communication with at least one external control signal transmitter moving in the building (7) or on the square (8), so that the lighting of individual luminaires (2) or groups (4) of luminaires (2) can be controlled by the control unit depending on a control signal from the signal transmitter.