Modular LED Lighting Device with Autonomous Color Control
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Solution Overview
Problem
Existing lighting devices with LEDs face limitations in achieving adjustable color, brightness, and radiation characteristics, particularly in compact designs suitable for professional lighting applications, where the integration of control electronics increases space requirements and restricts the number of LEDs, leading to unsatisfactory color rendering and color casts in film and video recordings.
Innovation Solution
A modular lighting device with a compact design that integrates LEDs emitting different wavelengths and a module electronic with a microcontroller, allowing for autonomous operation and adjustable light mixing, including temperature and color sensors, to achieve optimal color rendering and brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control electronics are integrated on the carrier with each LED, then each LED can be individually controlled, but the space requirement increases considerably and the number of LEDs that can be fitted decreases
Solution Approach 1:
The lighting device is divided into multiple independent lighting modules, each containing a limited number of LEDs (e.g., 3 LEDs per module). This segmentation allows the system to maintain individual LED control capability while reducing the space required per control unit, as each module has its own compact control electronics rather than requiring extensive carrier space for each individual LED's control circuitry.
Solution Approach 2:
The patent transitions from a two-dimensional carrier-based arrangement to a three-dimensional module-based construction. Multiple lighting modules are stacked or arranged in layers, utilizing the third dimension (height/depth) to accommodate more LEDs and control electronics without increasing the horizontal footprint, thereby reducing the overall carrier space requirement while maintaining control capabilities.
2Quantity of substance
If multiple lighting devices are combined to form a lamphead, then more LEDs can be used, but the mutual distance between individual LEDs becomes too great and the dimensions become unacceptable
Solution Approach 1:
Lighting modules are nested or closely packed together in a compact arrangement, with each module containing multiple LEDs in close proximity. This nesting approach allows a high quantity of LEDs to be fitted within a compact overall dimension, as the modular design enables efficient space utilization without requiring large mutual distances between individual LEDs across different modules.
Solution Approach 2:
Each lighting module is designed with specific local characteristics, containing a small group of LEDs (e.g., 3 LEDs) with controlled spacing optimized for that local region. This local optimization ensures that within each module, LEDs maintain appropriate distances for effective operation, while the overall lamphead dimensions remain compact due to the modular aggregation of these locally-optimized units.
3Illumination intensity
If LEDs of different colors are used to achieve required color temperature and color rendering, then color requirements are met, but a considerable color cast occurs in film recordings compared to incandescent lamps or HMI lamps
Solution Approach 1:
The system uses LEDs emitting light of different wavelengths (colors) and controls their individual intensities through pulse-width modulation or current control. By dynamically adjusting the emission parameters of each LED type (red, green, blue, yellow, white), the system can vary the overall spectral composition to achieve different color temperatures and color rendering indices, while minimizing color casts in film recordings through optimized spectral distribution.
Solution Approach 2:
The lighting device employs a composite light source comprising multiple LED types with different spectral characteristics (red LEDs, green LEDs, blue LEDs, yellow LEDs, and white LEDs). This composite approach combines the advantages of different wavelength emissions to achieve broad spectral coverage similar to incandescent or HMI lamps, improving color rendering and reducing color casts in film recordings while maintaining LED efficiency and longevity.
4Adaptability or versatility
If individual modules with different color characteristics are arranged in a matrix, then the total light characteristic can be varied considerably, but when individual modules fail, the total characteristic must be newly determined
Solution Approach 1:
The patent employs lighting modules with homogeneous or matched color characteristics and optical properties. By ensuring that individual modules have consistent spectral distributions and emission characteristics, the system maintains a stable and predictable total light characteristic even when some modules fail or are replaced. This homogeneity reduces the need for recalibration and maintains color consistency across the entire lighting device.
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 enables a lighting device with adjustable color, brightness, and radiation characteristics, providing homogeneous and controllable light emission, optimizing color rendering and brightness while allowing for dynamic variations and flexible configurations, such as switching between 'spotlight' and 'softlight' modes, and accommodating various geometric shapes.
Implementation Method 1
a light source with a plurality of light-emitting diodes (LEDs) emitting light of different wavelengths
Implementation Method 2
light-emitting diodes or LEDs offer the possibility of producing flat light-emitting lampheads homogeneous over their surface
Implementation Method 3
a primary optic for light bundling and/or for homogeneous brightness distribution of the light emitted by the LEDs and/or for color mixing the light of different wavelengths
Implementation Method 4
a diffuser plate of transparent plastic material, which consists of microlenses for light control
Data Source
AI summary
A lighting device comprising a plurality of lighting modules which include a module carrier on which a light source with a plurality of controllable light-emitting diodes emitting light of different wavelengths and arranged on a board, a temperature sensor and a module electronic are arranged. Said module electronic contains a digital circuit with a microcontroller for the local and autonomous signal processing, which actuates the LEDs in dependence on the temperature such that the brightness, color and chrominance of the light mixture composed of the LEDs emitting light of different wavelengths is constant. Said lighting modules being connected with other lighting modules or an external controller via a digital interface for transmitting the board temperature of the respective lighting module detected by means of the temperature sensor. A central master module or the external controller actuates the lighting modules such that a uniform brightness is obtained over the radiating surface.