Light Emitting Device Module with Adjustable Color Temperature
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Solution Overview
Problem
Conventional light emitting devices lack the ability to adjust color temperature effectively, which is necessary for various applications requiring specific lighting conditions.
Innovation Solution
A light emitting device module and surface light source device are designed with a package body containing a blue light emitting device and an orange light emitting device, along with a resin part including phosphors, and a drive control unit with first and second driving circuits to adjust current values applied to these devices based on external control signals, allowing for the adjustment of color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional single-color light emitting device is used, then the device structure is simple, but the color temperature cannot be adjusted
Solution Approach 1:
The patent combines multiple light emitting devices with different peak wavelengths (e.g., blue LED at 450nm and orange LED at 610nm) within a single package body, along with phosphors (yellow, green, red) in the resin part. This merging of multiple light sources and phosphors enables color temperature adjustment from 2,500K to 10,000K while maintaining a unified device structure, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent implements dynamic control of color temperature through independent driving circuits that can adjust the current values applied to each light emitting device in real-time. The drive control unit responds to external control signals to dynamically vary the output intensity of each LED, enabling continuous color temperature adjustment rather than fixed values, thus achieving adaptability without excessive structural complexity.
2Adaptability or versatility
If multiple light emitting devices with different wavelengths are combined, then color temperature adjustment is enabled, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by integrating both blue and orange light emitting devices along with multiple phosphor types (yellow, green, red) into a single light emitting device package. This universal design allows the same package to produce a wide color temperature range (2,500K-10,000K) by controlling the intensity ratios of different wavelength components, reducing the need for separate devices for different lighting conditions.
Solution Approach 2:
The resin part containing phosphors acts as an intermediary that converts the light from multiple LEDs into a unified white light output with adjustable color temperature. The phosphors mediate the interaction between different wavelength LEDs, transforming their combined output into controllable white light, thereby simplifying the overall system control while maintaining color temperature adjustability.
3Reliability
If conventional light emitting devices are used, then the manufacturing process is simple, but the ability to improve color rendering is limited
Solution Approach 1:
The patent uses composite phosphor materials including yellow, green, and red phosphors combined with blue and orange LEDs to create a multi-component light emitting system. This composite approach improves color rendering by utilizing the spectral characteristics of different phosphors and LEDs, achieving better color accuracy and rendering while managing manufacturing complexity through integrated packaging and standardized assembly processes.
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 the creation of white light with a range of color temperatures from 2,500 K to 10,000 K, improving color rendering and flexibility in lighting applications by controlling the current values applied to the light emitting devices.
Implementation Method 1
a first light emitting device mounted on the package body and emitting light of a particular color having a peak wavelength corresponding thereto
Implementation Method 2
a resin part sealing the first and second light emitting devices and containing at least one or more types of phosphors
Implementation Method 3
a second light emitting device mounted on the package body to be adjacent to the first light emitting device, adjusting an amount of light according to a current value of a driving power applied thereto to thereby control a color temperature
Data Source
AI summary
A light emitting device package includes a package body; a first light emitting device mounted on the package body and emitting light of a particular color; a second light emitting device mounted on the package body to be adjacent to the first light emitting device, adjusting an amount of light according to a current value applied thereto to thereby control a color temperature, and emitting orange light; and a resin part sealing the first and second light emitting devices and containing at least one or more types of phosphors.