High Voltage LED Array Color Control via Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for high voltage LED devices and fixtures that can operate efficiently at voltages greater than 40 volts, providing improved color point control and reducing the complexity of driver components, while maintaining uniformity and efficiency in lighting applications.
Innovation Solution
The development of LED devices with a control circuit that adjusts electrical current to maintain a constant color point or color temperature, utilizing a combination of LEDs with phosphor conversion and red LEDs to achieve warm white light, and employing specific patterns and arrangements of LEDs to optimize light emission and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high voltage operation (>40V) is implemented in LED devices, then device efficiency and current spreading improve, but color point control becomes more difficult
Solution Approach 1:
The LED device segments the light emission function into multiple independently controllable LED chips with different wavelengths (e.g., blue, cyan, green, yellow-green, red LEDs). Each wavelength component can be controlled separately through individual current paths, allowing precise color point control while operating at high voltages. The control circuit divides the total current into specific proportions for each wavelength to maintain constant color temperature.
Solution Approach 2:
The invention changes the electrical parameters by implementing high voltage operation (>40V) with reduced forward current, which improves current spreading and device efficiency. Simultaneously, the control circuit dynamically adjusts the current distribution to multiple LED chips to compensate for temperature-induced parameter variations, maintaining stable color output.
2Adaptability or versatility
If multiple differently colored LEDs are combined to achieve warm white light, then lighting versatility improves, but maintaining constant color temperature becomes more complex
Solution Approach 1:
The invention merges multiple LED chips with different wavelengths (blue, cyan, green, yellow-green, and red LEDs) into a single device package to produce warm white light. The red LED combined with phosphor-converted blue LED creates the warm white effect. This merging provides lighting versatility while the control circuit integrates control of all wavelength components to maintain constant color temperature.
Solution Approach 2:
The control circuit implements feedback control by monitoring the aggregate output emissions from multiple differently colored LEDs and dynamically adjusting the electrical current distribution. The controller receives information about the combined light output and modifies individual LED currents to maintain the aggregate emission at a substantially constant color point or color temperature, compensating for variations in each LED's characteristics.
3Device complexity
If high voltage operation is implemented, then driver component complexity is reduced, but current control precision for color stability becomes more challenging
Solution Approach 1:
The control circuit is designed with multi-functionality, serving both to distribute current to multiple LED chips and to maintain precise color temperature control. This single control circuit handles both the simplified high-voltage driving function and the precision current regulation function, eliminating the need for separate driver components while maintaining color stability through integrated control.
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 LED devices to operate efficiently at high voltages, simplifies driver design, and maintains consistent color output across varying temperatures, enhancing the uniformity and efficiency of LED lighting fixtures.
Implementation Method 1
A representative example of an LED device comprises a device having at least one LED chip, a portion of which can be coated with a phosphor such as, for example, yttrium aluminum garnet (YAG). The phosphor coating can convert light emitted from one or more LED chips into white light.
Data Source
AI summary
High voltage array light emitting devices and fixtures are disclosed. In one embodiment a light emitting device can include a submount, a light emission area disposed over the submount and a retention material adapted to be dispensed about the light emission area. The light emitting device can be operable at high voltages which are greater than approximately 40 volts (V). In one aspect, the retention material can be least partially disposed within the light emission area such that the retention material physically separates a first section of the light emission area from a second section of the light emission area.