Sequential LED Lighting with Movable Wavelength Converter
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Solution Overview
Problem
Conventional LED lighting devices emit light in a narrow spectrum, leading to color alterations in illuminated surfaces compared to sunlight, and pulsing LEDs to adjust color spectrum results in variable light output, causing flicker and inconsistent illumination.
Innovation Solution
A lighting device comprising multiple LEDs and a movable member with translucent segments, including wavelength conversion materials, where the movable member is positioned to mix light from each segment, and a control unit adjusts power to each LED in a time-sequential manner to maintain constant total power and prevent flicker, allowing for adjustable color and consistent light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs are pulsed to adjust color spectrum, then color adjustability is improved, but light output consistency deteriorates
Solution Approach 1:
The patent applies periodic action by pulsing multiple LEDs in a time-sequential manner according to a predetermined pattern. Each LED is activated in sequence rather than simultaneously, allowing the system to adjust color spectrum through controlled periodic illumination cycles while maintaining overall light output consistency through the coordinated timing of multiple light sources.
Solution Approach 2:
The system dynamically adjusts the illumination pattern by sequentially activating different LEDs based on a predetermined time sequence. The control system modifies which LEDs are active at different time intervals, enabling dynamic color spectrum adjustment while the total light output remains substantially constant through coordinated control of multiple LED elements.
2Adaptability or versatility
If power to individual LEDs is reduced to adjust color, then color mixing is improved, but total light output deteriorates
Solution Approach 1:
The patent merges the output of multiple LEDs by activating them in sequential time intervals rather than simultaneously. By combining the light output from multiple LEDs across different time periods within a complete illumination cycle, the system achieves effective color mixing while the cumulative light output across all LEDs maintains substantial constancy.
Solution Approach 2:
The system uses periodic action to cycle through multiple LEDs in a predetermined sequence. Each LED contributes to the overall color mixture during its active interval, and the periodic repetition of this cycle ensures that the total light output remains substantially constant while achieving the desired color mixing effect through the coordinated contribution of multiple light sources.
3Ease of operation
If LEDs are pulsed at high frequency to prevent flicker, then visual comfort is improved, but power consumption control becomes more complex
Solution Approach 1:
The patent implements periodic action by operating LEDs at high frequency cycles that exceed the human flicker fusion threshold. The control system manages the timing and sequencing of multiple LEDs within each periodic cycle, ensuring that the overall illumination appears steady to human observers while maintaining the ability to adjust color spectrum through the structured periodic activation pattern.
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 provides a lighting device with consistent light output and adjustable color without noticeable flicker, maintaining maximum light intensity across various colors by compensating for power variations through independent power control, ensuring high frequency light flashes and efficient cooling.
Implementation Method 1
At least one of the translucent segments comprises a wavelength conversion material... the wavelength conversion material is a phosphor converting the wavelength of the light transmitted therethrough
Implementation Method 2
The member is movable relative to the LEDs such that the light transmitted through the plurality of translucent segments is perceived time sequentially as a mix (or mixture) of the light transmitted through each of the translucent segments
Data Source
Figure 1~2
Figure 3
Figure 4~5b
AI summary
Lighting device (1) comprising a plurality of LEDs (2a - 2h) and a movable member (3) comprising a plurality of translucent segments (S1 - S8) arranged such that the light from the LEDs (2a - 2h) is transmitted therethrough. At least one of the translucent segments (S1 - S8) comprises a wavelength conversion material. The lighting device (1) further comprises a control unit (5) for adjusting the color of the light emitted from the lighting device by controlling the power supplied to each one of the LEDs (2a - 2h) in correspondence to the movable member (3), and by controlling the total power supplied to the lighting device (1) independently from the power supplied to each one of the plurality of LEDs (2a - 2h).