Illumination Device Liquid Crystal Light Distribution Angle Brightness Control
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Solution Overview
Problem
Conventional illumination devices face challenges in maintaining constant relative brightness when the light distribution angle is changed, as the light quantity per unit area varies with the irradiation area, requiring adjustments in light emission intensity to compensate for different irradiation regions.
Innovation Solution
An illumination device comprising a light source, a light adjustment device with liquid crystal cells for controlling light distribution angles, and a controller that calculates and adjusts light emission intensity based on the irradiation area ratio to maintain constant brightness, using a storage for correspondence relations and a driver to adjust the light source accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light distribution angle is changed by adjusting the liquid crystal cell, then the irradiation area is changed, but the light quantity per unit area varies causing non-constant relative brightness
Solution Approach 1:
The controller calculates the irradiation area based on the light distribution angle command value, retrieves the corresponding irradiation area ratio from storage, and uses this information to determine the appropriate light emission intensity. This feedback mechanism ensures that brightness remains constant across different irradiation areas by dynamically adjusting light emission intensity according to the calculated area ratios.
Solution Approach 2:
The system changes the light emission intensity parameter based on the irradiation area ratio. By storing correspondence relations between irradiation area ratios and light emission intensities, and dynamically adjusting the light emission intensity parameter according to the current irradiation area, the system maintains constant relative brightness while allowing light distribution angle to vary.
2Area of stationary object
If the irradiation area is increased, then the coverage region is expanded, but the light quantity per unit area decreases reducing illuminance
Solution Approach 1:
The storage pre-stores the correspondence relations between irradiation area ratios and light emission intensities before operation. This preliminary preparation allows the controller to quickly determine the appropriate light emission intensity without real-time calculation complexity, enabling seamless adjustment as the irradiation area changes.
Solution Approach 2:
The controller continuously monitors the light distribution angle command value, calculates the current irradiation area, retrieves the corresponding area ratio from storage, and adjusts the light emission intensity accordingly. This closed-loop feedback ensures that even as the irradiation area expands, the light quantity per unit area is compensated to maintain constant illuminance.
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 maintains constant relative brightness across varying light distribution angles by adjusting light emission intensity in real-time, ensuring consistent illuminance regardless of the irradiation area, enhancing the device's convenience and performance.
Implementation Method 1
the front of a transparent light bulb is covered by a liquid crystal light adjustment element, and the transmittance of a liquid crystal layer is changed to switch directly reaching light and scattering light
Data Source
AI summary
An illumination device includes a light source, a light adjustment device configured to control a light distribution angle of light emitted from the light source, and a controller configured to control the light source and the light adjustment device. The controller includes a storage configured to hold information indicating a correspondence relation between an irradiation area calculated based on a light distribution angle command value and an irradiation area ratio to a predetermined reference irradiation area, a light emission intensity generator configured to generate light emission intensity of the light source based on the information, and a driver configured to drive the light source based on the light emission intensity.