LED Filament Lamp with Asymmetric Encapsulation for Color Recognition
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Solution Overview
Problem
Existing LED filament lamps, designed to mimic incandescent bulbs, often provide unsatisfactory color recognition for general illumination due to their warm white light emission, which hinders visibility and color recognition.
Innovation Solution
An LED filament lamp with asymmetrically arranged LEDs and an encapsulant containing luminescent material that converts light, allowing for different color temperatures and light types in different directions, enhancing visibility and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If LED filaments emit warm white light to mimic incandescent bulbs and provide decorative appearance, then the aesthetic value and decorative effect are improved, but the visibility and color recognition for general illumination deteriorate
Solution Approach 1:
The LED filament is divided into multiple LED elements arranged in series along the filament structure. Each LED element can be individually controlled or grouped to emit different color temperatures, allowing the filament to provide both warm white light for decorative appearance and cool white light for functional illumination with improved visibility and color recognition.
Solution Approach 2:
Different segments or regions of the LED filament are designed to emit different color temperatures. Certain portions emit warm white light (2000-3000K) to maintain the decorative incandescent appearance, while other portions emit cool white light (6504K) to provide enhanced visibility and color recognition for general illumination tasks.
2Shape
If LED filaments emit warm white light to maintain incandescent appearance, then the decorative effect is improved, but the color recognition and functional illumination deteriorate
Solution Approach 1:
The LED filament is segmented into multiple independently controllable LED elements that can emit different color temperatures. This allows simultaneous provision of warm white light for decorative appearance and cool white light for functional illumination with accurate color recognition, eliminating the information loss about object colors.
Solution Approach 2:
The LED filament is designed to perform multiple functions: it can emit warm white light for decorative purposes to mimic incandescent appearance, and can also emit cool white light for functional illumination tasks requiring accurate color recognition and visibility, thus serving both aesthetic and practical needs.
3Device complexity
If single color temperature LEDs are used to simplify the light generating device, then the device complexity is reduced, but the adaptability for different lighting needs deteriorates
Solution Approach 1:
The LED filament comprises multiple LED elements arranged in series that can be individually controlled or grouped. This segmentation enables the device to adapt to different lighting needs by controlling specific segments to emit appropriate color temperatures, providing both decorative warm white light and functional cool white light without requiring completely different lighting devices.
Solution Approach 2:
The multi-LED filament structure is designed to be universally applicable for both decorative lighting and functional illumination tasks. By controlling different LED elements to emit different color temperatures, a single device can satisfy diverse lighting requirements including ambient lighting, task lighting, and accent lighting, eliminating the need for multiple specialized lighting devices.
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 lamp provides warm white light for decorative purposes and cool white light for functional tasks, improving visibility and color recognition by offering gradual changes in correlated color temperature.
Implementation Method 1
The encapsulant comprises a luminescent material configured to convert at least part of the light source light into luminescent material light
Data Source
Figure 1A~1B(II)
Figure 1C(I)~1C(VIII)
Figure 1D~1E
AI summary
The invention provides a light generating device (1000) comprising an LED filament (100), wherein the LED filament (100) comprises a support (105), a set (107) of solid state light sources (110), and an encapsulant (160), wherein: (I) the LED filament (100) has a length axis (108) having a first length (L1); (II) the solid state light sources (110) are arranged over the first length (L1) of the LED filament (100) on the support (105), wherein the solid state light sources (110) are configured to generate light source light (111); (III) the encapsulant (160) encloses at least part of each of the solid state light sources (110) of the set (107) of solid state light sources (110), wherein the encapsulant (160) comprises a luminescent material (200) configured to convert at least part of the light source light (111) into luminescent material light (201); (IV) the light generating device (1000) is configured to generate device light (1001) comprising one or more of (i) the light source light (111) and (ii) the luminescent material light (201); (V) for each of the solid state light sources (110) of the set (107) of solid state light sources (110) applies that relative to a first virtual plane (171) parallel to the length axis (108) and intersecting with the solid state light source (110) the encapsulant (160) is asymmetrically configured relative to the first virtual plane (171).